The Experts below are selected from a list of 756 Experts worldwide ranked by ideXlab platform

Siobhan Austen - One of the best experts on this subject based on the ideXlab platform.

  • future perspectives on sustainable tribology
    Renewable & Sustainable Energy Reviews, 2012
    Co-Authors: I Tzanakis, Ben Thomas, Mark Hadfield, S M Noya, Ian Henshaw, Siobhan Austen
    Abstract:

    This paper highlights the future perspectives of sustainable tribology by examining the economic, environmental and social impact of three tribological case studies. One case study examines the sustainability and durability of micro-CHP systems looking the tribological phenomena generated within a scroll expander system. The scroll is the main part of a specific micro-CHP system and experiences wear and cavitation damage. The tribological optimization of the scroll expander improves the sustainability of the micro-CHP unit while it has a serious economic and environmental impact to the consumers and to the society in general. Another case study is focused on friction and wear performance of lifeboat launch Slipways. The causes of high friction and wear during the RNLI's lifeboat launches along an inclined Slipway are investigated with a view to reducing the environmental impact due to Slipway panel wear and lubricant release into the marine environment. The project encompasses the sustainable design of Slipway panels using design modifications based on tribological investigations to double their lifespan, while environmental and economic impact was significantly reduced by the use of biodegradable greases and water as lubricants. The final case study involves an investigation of recycled plastic materials to replace polyurethane used on skateboard wheels, scooters and similar applications. Polyurethane (PU) is difficult to recycle. With the dwindling resources and environmental problems facing the world today, recycling for both waste reduction and resource preservation has become an increasingly important aspect of sustainability. The tribological results showed that recycled polycarbonate plastic can effectively act as a substitute to polyurethane wheels. Moreover, sustainability considerations showing the environmental benefits of the use of recycled plastics over PU include reducing the CO2 footprint by 50% and the energy consumed by 60%, among other benefits. These case studies emphasise the importance of sustainable tribology in our epoch showing that increased sustainability performance can be achieved through tribology to a significant extent in many cases, providing stability to our world and more viable long term growth to our societies.

  • Alternative Lifeboat Slipway Bearing Materials
    2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution has provided marine search and rescue cover along the UK and Irish coast since 1771. This is accomplished using a variety of lifeboats and lifeboat stations depending on local conditions. In regions where there is a large tidal range, or where there is no nearby natural harbour it is necessary to use an inclined Slipway station to launch lifeboats. This consists of an inclined Slipway, usually at a gradient of 1 in 5-6, with a large boathouse holding the lifeboat under cover at the top. The lifeboat is released from the boathouse and proceeds under its own weight along the Slipway into the sea. Recovery is performed by manoeuvring the lifeboat keel onto the Slipway keelway where a winch line is attached and the lifeboat hauled back into the boathouse at the top of the Slipway. Advances in lifeboat technology has seen the size and mass of Slipway lifeboats increase over the years culminating in the new 35+ tonne Tamar class (introduced 2005) and this has presented considerable engineering challenges to the safe and consistent operation of lifeboat Slipway stations. Previous Slipway launch practice had involved using a greased steel channel, along which the lifeboat keel slides, however with increasing lifeboat mass this has become unsuitable with problems of high friction along the Slipway and concerns regarding the environmental impacts of the grease repeatedly being washed into the sea surrounding the base of the Slipway. This research focuses on the search for suitable alternative Slipway linings and lubricants culminating in the recommendation of a new jute/phenolic resin composite lining material to be used with a novel freshwater or seawater lubrication system, and with the development of techniques to reduce panel wear and to establish consistent panel monitoring and replacement criteria with the aim of reducing the environmental, material and economic costs associated with reliable lifeboat Slipway operation.

  • Wear and Friction Modeling on Lifeboat Launch Systems
    Tribology Transactions, 2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution (RNLI) provides search and rescue cover along the UK and RoI coast using a variety of lifeboats and launch techniques. In locations where there is no natural harbor it is necessary to use a Slipway to launch the lifeboat into the sea. Lifeboat Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway lined with low-friction composite materials; the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is later recovered using a winch line. It is common to manually apply grease to the composite Slipway lining before each launch and recovery in order to ensure sufficiently low friction for successful operation. With the introduction of the Tamar-class lifeboat it is necessary to upgrade existing boathouses and standardize Slipway operational procedures to ensure consistent operation. The higher contact pressures associated with the new lifeboat have led to ...

  • Wear And Friction Modelling On Lifeboat LaunchSlipway Panels
    WIT transactions on engineering sciences, 2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution provides search and rescue cover along the United Kingdom and Republic of Ireland coast using a variety of lifeboats and launch techniques. In locations where there is no natural harbour it is necessary to use an inclined Slipway to launch the lifeboat into the sea. Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway lined with low friction composite materials, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is subsequently recovered to the top of the Slipway using a winch line. With the introduction of the new, larger ‘Tamar’ class lifeboat it is necessary to upgrade existing boathouses and standardise Slipway operational procedures to ensure consistent operation. The higher contact pressures and launch velocities associated with the new lifeboat have led to issues of high friction and wear on the low friction composite linings and a number of methods have been adopted to mitigate this effect. This paper presents a methodology for assessing Slipway lining performance so that friction and wear conditions along the Slipway can be monitored to ensure consistent operation. A multidisciplinary approach using tribometer testing in conjunction with finite element analysis and real world Slipway condition surveys is adopted to extend the scope of investigation to incorporate common real world effects such as panel misalignments. Various lubricants are assessed for their suitability with regard to friction and wear performance in addition to sustainability considerations using the methodology, and modifications to the design of Slipway panels, guidelines for lifeboat operation procedures and suitable panel installation tolerances are developed. Finally, new Slipway condition monitoring procedures are proposed www.witpress.com, ISSN 1743-3533 (on-line) WIT Transactions on Engineering Sciences, Vol 66, © 2010 WIT Press Tribology and Design 209 doi:10.2495/TD100181 incorporating Slipway panel failure and replacement criteria and recovery winch based condition monitoring.

  • Experimental wear modelling of lifeboat Slipway launches
    Tribology International, 2009
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    It is necessary to use an inclined Slipway to launch lifeboats in locations where there is no natural harbour. Slipway stations consist of an initial roller section followed by an inclined keelway, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. Contact is between the lifeboat keel and a lined, greased keelway and this determines the friction along the Slipway. This paper describes a bench test methodology to investigate this contact. The selection of a modified TE57 reciprocating tribometer and design of a modified pin on plate arrangement is discussed. A test schedule for both the original nickel/chromium coated steel lining and the new low friction jute fibre/phenolic resin composite lining is developed to accurately reflect real world conditions including environmental contamination such as seawater or wind-blown sand. Environmentally conscious lubricants including water and bio-greases are investigated and compared for their effects in reducing Slipway panel friction and wear. Experimental data are collected to establish wear mechanisms, wear volumes and friction characteristics for a range of lubricants and environmental contaminants for the two most common lifeboat keelway lining materials. Implications of this research for future lifeboat Slipway design are discussed.

Ben Thomas - One of the best experts on this subject based on the ideXlab platform.

  • future perspectives on sustainable tribology
    Renewable & Sustainable Energy Reviews, 2012
    Co-Authors: I Tzanakis, Ben Thomas, Mark Hadfield, S M Noya, Ian Henshaw, Siobhan Austen
    Abstract:

    This paper highlights the future perspectives of sustainable tribology by examining the economic, environmental and social impact of three tribological case studies. One case study examines the sustainability and durability of micro-CHP systems looking the tribological phenomena generated within a scroll expander system. The scroll is the main part of a specific micro-CHP system and experiences wear and cavitation damage. The tribological optimization of the scroll expander improves the sustainability of the micro-CHP unit while it has a serious economic and environmental impact to the consumers and to the society in general. Another case study is focused on friction and wear performance of lifeboat launch Slipways. The causes of high friction and wear during the RNLI's lifeboat launches along an inclined Slipway are investigated with a view to reducing the environmental impact due to Slipway panel wear and lubricant release into the marine environment. The project encompasses the sustainable design of Slipway panels using design modifications based on tribological investigations to double their lifespan, while environmental and economic impact was significantly reduced by the use of biodegradable greases and water as lubricants. The final case study involves an investigation of recycled plastic materials to replace polyurethane used on skateboard wheels, scooters and similar applications. Polyurethane (PU) is difficult to recycle. With the dwindling resources and environmental problems facing the world today, recycling for both waste reduction and resource preservation has become an increasingly important aspect of sustainability. The tribological results showed that recycled polycarbonate plastic can effectively act as a substitute to polyurethane wheels. Moreover, sustainability considerations showing the environmental benefits of the use of recycled plastics over PU include reducing the CO2 footprint by 50% and the energy consumed by 60%, among other benefits. These case studies emphasise the importance of sustainable tribology in our epoch showing that increased sustainability performance can be achieved through tribology to a significant extent in many cases, providing stability to our world and more viable long term growth to our societies.

  • Alternative Lifeboat Slipway Bearing Materials
    2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution has provided marine search and rescue cover along the UK and Irish coast since 1771. This is accomplished using a variety of lifeboats and lifeboat stations depending on local conditions. In regions where there is a large tidal range, or where there is no nearby natural harbour it is necessary to use an inclined Slipway station to launch lifeboats. This consists of an inclined Slipway, usually at a gradient of 1 in 5-6, with a large boathouse holding the lifeboat under cover at the top. The lifeboat is released from the boathouse and proceeds under its own weight along the Slipway into the sea. Recovery is performed by manoeuvring the lifeboat keel onto the Slipway keelway where a winch line is attached and the lifeboat hauled back into the boathouse at the top of the Slipway. Advances in lifeboat technology has seen the size and mass of Slipway lifeboats increase over the years culminating in the new 35+ tonne Tamar class (introduced 2005) and this has presented considerable engineering challenges to the safe and consistent operation of lifeboat Slipway stations. Previous Slipway launch practice had involved using a greased steel channel, along which the lifeboat keel slides, however with increasing lifeboat mass this has become unsuitable with problems of high friction along the Slipway and concerns regarding the environmental impacts of the grease repeatedly being washed into the sea surrounding the base of the Slipway. This research focuses on the search for suitable alternative Slipway linings and lubricants culminating in the recommendation of a new jute/phenolic resin composite lining material to be used with a novel freshwater or seawater lubrication system, and with the development of techniques to reduce panel wear and to establish consistent panel monitoring and replacement criteria with the aim of reducing the environmental, material and economic costs associated with reliable lifeboat Slipway operation.

  • Wear and Friction Modeling on Lifeboat Launch Systems
    Tribology Transactions, 2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution (RNLI) provides search and rescue cover along the UK and RoI coast using a variety of lifeboats and launch techniques. In locations where there is no natural harbor it is necessary to use a Slipway to launch the lifeboat into the sea. Lifeboat Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway lined with low-friction composite materials; the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is later recovered using a winch line. It is common to manually apply grease to the composite Slipway lining before each launch and recovery in order to ensure sufficiently low friction for successful operation. With the introduction of the Tamar-class lifeboat it is necessary to upgrade existing boathouses and standardize Slipway operational procedures to ensure consistent operation. The higher contact pressures associated with the new lifeboat have led to ...

  • Wear And Friction Modelling On Lifeboat LaunchSlipway Panels
    WIT transactions on engineering sciences, 2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution provides search and rescue cover along the United Kingdom and Republic of Ireland coast using a variety of lifeboats and launch techniques. In locations where there is no natural harbour it is necessary to use an inclined Slipway to launch the lifeboat into the sea. Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway lined with low friction composite materials, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is subsequently recovered to the top of the Slipway using a winch line. With the introduction of the new, larger ‘Tamar’ class lifeboat it is necessary to upgrade existing boathouses and standardise Slipway operational procedures to ensure consistent operation. The higher contact pressures and launch velocities associated with the new lifeboat have led to issues of high friction and wear on the low friction composite linings and a number of methods have been adopted to mitigate this effect. This paper presents a methodology for assessing Slipway lining performance so that friction and wear conditions along the Slipway can be monitored to ensure consistent operation. A multidisciplinary approach using tribometer testing in conjunction with finite element analysis and real world Slipway condition surveys is adopted to extend the scope of investigation to incorporate common real world effects such as panel misalignments. Various lubricants are assessed for their suitability with regard to friction and wear performance in addition to sustainability considerations using the methodology, and modifications to the design of Slipway panels, guidelines for lifeboat operation procedures and suitable panel installation tolerances are developed. Finally, new Slipway condition monitoring procedures are proposed www.witpress.com, ISSN 1743-3533 (on-line) WIT Transactions on Engineering Sciences, Vol 66, © 2010 WIT Press Tribology and Design 209 doi:10.2495/TD100181 incorporating Slipway panel failure and replacement criteria and recovery winch based condition monitoring.

  • Experimental wear modelling of lifeboat Slipway launches
    Tribology International, 2009
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    It is necessary to use an inclined Slipway to launch lifeboats in locations where there is no natural harbour. Slipway stations consist of an initial roller section followed by an inclined keelway, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. Contact is between the lifeboat keel and a lined, greased keelway and this determines the friction along the Slipway. This paper describes a bench test methodology to investigate this contact. The selection of a modified TE57 reciprocating tribometer and design of a modified pin on plate arrangement is discussed. A test schedule for both the original nickel/chromium coated steel lining and the new low friction jute fibre/phenolic resin composite lining is developed to accurately reflect real world conditions including environmental contamination such as seawater or wind-blown sand. Environmentally conscious lubricants including water and bio-greases are investigated and compared for their effects in reducing Slipway panel friction and wear. Experimental data are collected to establish wear mechanisms, wear volumes and friction characteristics for a range of lubricants and environmental contaminants for the two most common lifeboat keelway lining materials. Implications of this research for future lifeboat Slipway design are discussed.

Mark Hadfield - One of the best experts on this subject based on the ideXlab platform.

  • future perspectives on sustainable tribology
    Renewable & Sustainable Energy Reviews, 2012
    Co-Authors: I Tzanakis, Ben Thomas, Mark Hadfield, S M Noya, Ian Henshaw, Siobhan Austen
    Abstract:

    This paper highlights the future perspectives of sustainable tribology by examining the economic, environmental and social impact of three tribological case studies. One case study examines the sustainability and durability of micro-CHP systems looking the tribological phenomena generated within a scroll expander system. The scroll is the main part of a specific micro-CHP system and experiences wear and cavitation damage. The tribological optimization of the scroll expander improves the sustainability of the micro-CHP unit while it has a serious economic and environmental impact to the consumers and to the society in general. Another case study is focused on friction and wear performance of lifeboat launch Slipways. The causes of high friction and wear during the RNLI's lifeboat launches along an inclined Slipway are investigated with a view to reducing the environmental impact due to Slipway panel wear and lubricant release into the marine environment. The project encompasses the sustainable design of Slipway panels using design modifications based on tribological investigations to double their lifespan, while environmental and economic impact was significantly reduced by the use of biodegradable greases and water as lubricants. The final case study involves an investigation of recycled plastic materials to replace polyurethane used on skateboard wheels, scooters and similar applications. Polyurethane (PU) is difficult to recycle. With the dwindling resources and environmental problems facing the world today, recycling for both waste reduction and resource preservation has become an increasingly important aspect of sustainability. The tribological results showed that recycled polycarbonate plastic can effectively act as a substitute to polyurethane wheels. Moreover, sustainability considerations showing the environmental benefits of the use of recycled plastics over PU include reducing the CO2 footprint by 50% and the energy consumed by 60%, among other benefits. These case studies emphasise the importance of sustainable tribology in our epoch showing that increased sustainability performance can be achieved through tribology to a significant extent in many cases, providing stability to our world and more viable long term growth to our societies.

  • Alternative Lifeboat Slipway Bearing Materials
    2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution has provided marine search and rescue cover along the UK and Irish coast since 1771. This is accomplished using a variety of lifeboats and lifeboat stations depending on local conditions. In regions where there is a large tidal range, or where there is no nearby natural harbour it is necessary to use an inclined Slipway station to launch lifeboats. This consists of an inclined Slipway, usually at a gradient of 1 in 5-6, with a large boathouse holding the lifeboat under cover at the top. The lifeboat is released from the boathouse and proceeds under its own weight along the Slipway into the sea. Recovery is performed by manoeuvring the lifeboat keel onto the Slipway keelway where a winch line is attached and the lifeboat hauled back into the boathouse at the top of the Slipway. Advances in lifeboat technology has seen the size and mass of Slipway lifeboats increase over the years culminating in the new 35+ tonne Tamar class (introduced 2005) and this has presented considerable engineering challenges to the safe and consistent operation of lifeboat Slipway stations. Previous Slipway launch practice had involved using a greased steel channel, along which the lifeboat keel slides, however with increasing lifeboat mass this has become unsuitable with problems of high friction along the Slipway and concerns regarding the environmental impacts of the grease repeatedly being washed into the sea surrounding the base of the Slipway. This research focuses on the search for suitable alternative Slipway linings and lubricants culminating in the recommendation of a new jute/phenolic resin composite lining material to be used with a novel freshwater or seawater lubrication system, and with the development of techniques to reduce panel wear and to establish consistent panel monitoring and replacement criteria with the aim of reducing the environmental, material and economic costs associated with reliable lifeboat Slipway operation.

  • Wear and Friction Modeling on Lifeboat Launch Systems
    Tribology Transactions, 2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution (RNLI) provides search and rescue cover along the UK and RoI coast using a variety of lifeboats and launch techniques. In locations where there is no natural harbor it is necessary to use a Slipway to launch the lifeboat into the sea. Lifeboat Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway lined with low-friction composite materials; the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is later recovered using a winch line. It is common to manually apply grease to the composite Slipway lining before each launch and recovery in order to ensure sufficiently low friction for successful operation. With the introduction of the Tamar-class lifeboat it is necessary to upgrade existing boathouses and standardize Slipway operational procedures to ensure consistent operation. The higher contact pressures associated with the new lifeboat have led to ...

  • Wear And Friction Modelling On Lifeboat LaunchSlipway Panels
    WIT transactions on engineering sciences, 2010
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    The Royal National Lifeboat Institution provides search and rescue cover along the United Kingdom and Republic of Ireland coast using a variety of lifeboats and launch techniques. In locations where there is no natural harbour it is necessary to use an inclined Slipway to launch the lifeboat into the sea. Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway lined with low friction composite materials, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is subsequently recovered to the top of the Slipway using a winch line. With the introduction of the new, larger ‘Tamar’ class lifeboat it is necessary to upgrade existing boathouses and standardise Slipway operational procedures to ensure consistent operation. The higher contact pressures and launch velocities associated with the new lifeboat have led to issues of high friction and wear on the low friction composite linings and a number of methods have been adopted to mitigate this effect. This paper presents a methodology for assessing Slipway lining performance so that friction and wear conditions along the Slipway can be monitored to ensure consistent operation. A multidisciplinary approach using tribometer testing in conjunction with finite element analysis and real world Slipway condition surveys is adopted to extend the scope of investigation to incorporate common real world effects such as panel misalignments. Various lubricants are assessed for their suitability with regard to friction and wear performance in addition to sustainability considerations using the methodology, and modifications to the design of Slipway panels, guidelines for lifeboat operation procedures and suitable panel installation tolerances are developed. Finally, new Slipway condition monitoring procedures are proposed www.witpress.com, ISSN 1743-3533 (on-line) WIT Transactions on Engineering Sciences, Vol 66, © 2010 WIT Press Tribology and Design 209 doi:10.2495/TD100181 incorporating Slipway panel failure and replacement criteria and recovery winch based condition monitoring.

  • Experimental wear modelling of lifeboat Slipway launches
    Tribology International, 2009
    Co-Authors: Ben Thomas, Mark Hadfield, Siobhan Austen
    Abstract:

    It is necessary to use an inclined Slipway to launch lifeboats in locations where there is no natural harbour. Slipway stations consist of an initial roller section followed by an inclined keelway, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. Contact is between the lifeboat keel and a lined, greased keelway and this determines the friction along the Slipway. This paper describes a bench test methodology to investigate this contact. The selection of a modified TE57 reciprocating tribometer and design of a modified pin on plate arrangement is discussed. A test schedule for both the original nickel/chromium coated steel lining and the new low friction jute fibre/phenolic resin composite lining is developed to accurately reflect real world conditions including environmental contamination such as seawater or wind-blown sand. Environmentally conscious lubricants including water and bio-greases are investigated and compared for their effects in reducing Slipway panel friction and wear. Experimental data are collected to establish wear mechanisms, wear volumes and friction characteristics for a range of lubricants and environmental contaminants for the two most common lifeboat keelway lining materials. Implications of this research for future lifeboat Slipway design are discussed.

Ady Satria - One of the best experts on this subject based on the ideXlab platform.

  • PERENCANAAN Slipway PELABUHAN PERIKANAN SAMUDERA NIZAM ZACHMAN JAKARTA
    2015
    Co-Authors: M. Riza Falahudin, Ady Satria, Slamet Hargono, P Priyo Nugroho
    Abstract:

    Slipway which is going to be built is in Fishing Port of Nizam Zachman Jakarta (PPSNZJ). The objective of this final project is to design Slipway structure that is able to provide repaired and maintenance service, as well as constructing new ships with 271,71 GT is the maximum weight. From the calculation result, it was obtained that the total length of Slipway structure is 152 m, 40 m on the land and 112 m on the sea. The width of this Slipway is 13 m. Elements of the structure planned consisted of dimension of longitudinal beams, transverse beams, and plates. Software SAP2000 was used for modeling and analytical calculation of Slipway structure. The structure consisted of reinforced concrete with the concrete quality of 30 Mpa. The dimension for the longitudinal beams is 40x25 cm and for the transverse beams is 35x25 cm. The thickness slab of land section is 160 mm, and 60 mm for the concrete cover. The foundations used is spun pile with the depth of 42 m.

  • PERENCANAAN Slipway PELABUHAN PERIKANAN SAMUDERA NIZAM ZACHMAN JAKARTA
    2015
    Co-Authors: Riza M. Falahudin, Ady Satria
    Abstract:

    ABSTRAK Pelabuhan Perikanan Samudera Nizam Zachman Jakarta (PPSNZJ) merupakan salah satu pelabuhan tipe A (Samudera) yaitu pelabuhan perikanan terbesar di indonesia. Pelabuhan tersebut memiliki fasilitas perbaikan kapal yang berupa Slipway. PPSNZJ memiliki tiga Slipway yaitu Slipway I, Slipway II dan Slipway III, dari ketiga Slipway tersebut hanya mampu melayani kapal ikan dengan bobot maksimal 100 GT. Padahal kapal yang bobotnya lebih dari 200 GT jumlahnya lebih dari 100 kapal. Sehingga ketiga Slipway tersebut tidak mampu melayani perbaikan dan perawatan kapal yang ada di pelabuhan secara maksimal. Slipway adalah bangunan yang berbentuk miring dengan kemiringan antara 1/12 – 1/24, yang digunakan untuk mereparasi kapal, perawatan kapal ataupun pembuatan kapal baru. Kapal yang akan diperbaiki, dinaikan ke dalam Slipway dengan cara ditarik dengan menggunakan winch. Kapal yang akan ditarik sebelumnya ditempatkan diatas rangkaian cradle, yaitu rangkaian kereta yang terbuat dari baja yang berjalan di atas rel. Tujuan penyusunan Tugas Akhir ini adalah merencanakan struktur Slipway yang dapat melayani jasa perbaikan kapal, perawatan kapal dan pembuatan kapal baru dengan kapasitas pelayanan kapal yang bobotnya lebih dari 200 GT. Perencanaan Slipway ini menggunakan struktur beton bertulang, dengan jenis pondasi yang digunakan adalah tiang pancang tipe spun pile. Perhitungan analisis struktur menggunakan software Structural Analysis Programe (SAP2000), dengan kuat tekan beton (f’c) sebesar 30 Mpa dan kuat tarik baja tulangan (fy) sebesar 400 Mpa. Sebagai dasar perencanaan digunakan peraturan perencanaan beton bertulang dari SNI 03-2874-2002. Dengan menggunakan bobot kapal rencana sebesar 271,72 GT, didapatkan dimensi Slipway yang terdiri dari panjang total Slipway sebesar 152 m, dan lebar total Slipway sebesar 13 m. Dari perencanaan struktur didapatkan ukuran dimensi balok memanjang sebesar 40x25 cm, dimensi balok melintang sebesar 35x25 cm, pelat lantai dengan tebal 16 cm, dengan selimut beton sebesar 60 mm, dan diameter spun pile sebesar 300 mm dengan kedalaman 42 m. Kata Kunci : PPSNZJ, Slipway, Bobot Kapa

Thomas Ben - One of the best experts on this subject based on the ideXlab platform.

  • Wear and Friction Modeling on Lifeboat Launch Systems
    'Informa UK Limited', 2010
    Co-Authors: Thomas Ben, Hadfield Mark, Austen S.
    Abstract:

    The RNLI provides search and rescue cover along the UK and RoI coast using a variety of lifeboats and launch techniques. In locations where there is no natural harbour it is necessary to use a Slipway to launch the lifeboat into the sea. Lifeboat Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway lined with low friction composite materials, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is later recovered using a winch line. It is common to manually apply grease to the composite Slipway lining before each launch and recovery in order to ensure sufficiently low friction for successful operation. With the introduction of the Tamar class lifeboat it is necessary to upgrade existing boathouses and standardise Slipway operational procedures to ensure consistent operation. The higher contact pressures associated with the new lifeboat have led to issues of high friction and wear on the composite Slipway linings and the manual application of grease to reduce friction is to be restricted due to environmental impact and cost factors. This paper presents a multidisciplinary approach to modelling Slipway panel wear and friction using tribometer testing in conjunction with finite element analysis and Slipway condition surveys to incorporate common real-world effects such as panel misalignments. Finally, it is shown that a freshwater lubrication system is effective, reducing cost and environmental impacts while maintaining good friction and wear performance

  • Experimental Wear Modelling of Lifeboat Slipway Launches
    'Elsevier BV', 2009
    Co-Authors: Thomas Ben, Hadfield Mark, Austen S.
    Abstract:

    It is necessary to use an inclined Slipway to launch lifeboats in locations where there is no natural harbour. Slipway stations consist of an initial roller section followed by an inclined keelway, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. Contact is between the lifeboat keel and a lined, greased keelway and this that determines the friction along the Slipway. This paper describes a bench test methodology to investigate this contact. The selection of a modified TE57 reciprocating tribometer and design of a modified pin on plate arrangement is discussed. A test schedule for both the original nickel/chromium coated steel lining and the new low-friction jute fibre/phenolic resin composite lining is developed to accurately reflect real world conditions including environmental contamination such as seawater or wind-blown sand. Environmentally conscious lubricants including water and bio-greases are investigated and compared for their effects in reducing Slipway panel friction and wear. Experimental data is collected to establish wear mechanisms, wear volumes and friction characteristics for a range of lubricants and environmental contaminants for the two most common lifeboat keelway lining materials. Implications of this research for future lifeboat Slipway design are discussed

  • Wear observations applied to Lifeboat Slipway Launches
    'Elsevier BV', 2009
    Co-Authors: Thomas Ben, Hadfield Mark, Austen S.
    Abstract:

    It is necessary to use an inclined Slipway to launch a large lifeboat in locations where there is no natural harbour or where there is a large tidal range. Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway of nickel/chromium coated steel, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is subsequently recovered to the top of the Slipway using a winch line. With the introduction of the new, larger Tamar class lifeboat existing boathouses are being upgraded and existing low friction coated steel Slipway lining materials replaced with a low-friction jute fibre/phenolic resin composite, which is designed to operate with unlubricated conditions. This has led to problems of high wear on Slipway panels, particularly where the lifeboat mounts the Slipway for recovery. This paper describes a method for assessing Slipway lining materials and lubricants. The selection of an appropriate test machine, the TE92 rotary tribometer, and design of a modified ring on disc arrangement incorporating panel interfaces and attaching holes effects is described. An experimental methodology is developed using programmed running intervals to simulate dwell effects. Experimental data is thus presented to establish Slipway panel wear rates for a range of lubricants and contact pressures. Experimental results are incorporated into real-world Slipway surveys to develop the wear scenario. Results and implications of this research for future lifeboat Slipway design are discussed

  • Friction and wear performance of lifeboat launch Slipways
    2009
    Co-Authors: Thomas Ben
    Abstract:

    The Royal National Lifeboat Institution provides a marine search and rescue service using lifeboat stations sited along the coast of the UK and Ireland. In locations where there is no natural harbour or where there is a large tidal range it is necessary to use an inclined Slipway to launch a large lifeboat. Lifeboat Slipway stations consist of an initial section where the boat is held on rollers followed by an inclined keelway of nickel/chromium coated steel, the lifeboat is released from the top of the Slipway and proceeds under its own weight into the water. The lifeboat is subsequently recovered to the top of the Slipway using a winch line. With the introduction of the new, larger Tamar class lifeboat existing boathouses are being upgraded and existing low friction coated steel Slipway lining materials replaced with a low-friction jute fibre/phenolic resin composite. The composite Slipway lining material was selected in part because it was able to run unlubricated or water lubricated. However the friction problems have been such that it is usual to line the Slipway with grease before every launch and recovery. This adds to the number of operations involved in a launch and has safety implications. The use of grease to line the Slipway results in the grease being washed out to sea with effects on the surrounding area, it is likely that there is some environmental impact due to this as the grease is non-biodegradeable and not recommended for open water use according to the material data sheet. Because of these issues it is desirable to develop a set of working guidelines for crews to reduce both these risks by setting appropriate conditions for the manual application of grease along the Slipway. These guidelines will also feature a method of assessing the wear of Slipway panels so that panels can be replaced before they present a hazard to lifeboat operation. This thesis describes a method for assessing Slipway lining materials and lubricants. Appropriate tribometer test machines are selected to assess Slipway lining materials performance, the TE57 reciprocating tribometer and the TE92 rotary tribometer are used in conjunction to ascertain friction and wear performance respectively. These results are combined with detailed Slipway panel surveys and case studies, and with Finite Element models to develop a method for assessing and predicting the friction and wear along a panel lined Slipway. These results are used to develop Slipway performance monitoring techniques for lifeboat crews and to develop design modification to combat high friction and wear on Slipway panels. The adoption of a modified Slipway panel and water lubrication system is proposed, this arrangement reduces panel misalignment contributions to Slipway friction and wear resulting in more reliable Slipway performance and is also projected to save the RNLI up to £195k annually compared with current practice.EThOS - Electronic Theses Online ServiceGBUnited Kingdo