The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform
Li Wang - One of the best experts on this subject based on the ideXlab platform.
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Enhancing performance, durability and service life of industrial rubber products by silica and silane fillers
2007Co-Authors: Li WangAbstract:Typical rubber compounds used to manufacture industrial products such as tyres, hoses, conveyor belts, acoustics, shock pads, and Engine Mountings contain up to eight classes of chemical additives· including curing agents, accelerators, activators, processing aids, and antidegradants. The cure systems in these articles often consists of primary and secondary accelerators, primary and secondary activators, and elemental sulphur. Recent legislation impacting upon the working environment, safety and health has imposed a considerable burden on the manufacturers of rubber compounds to meet various obligations. The selection of raw materials and manufacturing processes that do not harm the environment is of great importance. A novel technique for preparing rubber formulations using crosslinking nanofillers such as silanised precipitated silica has been developed in this research. The silica surfaces were pre-treated with bis[3-triethoxysilylpropyl-] tetrasulphane coupling agent (TESPT).· TESPT is a sulphur containing bifunctional organosilane which chemically adheres silica to rubber and also prevents silica from interfering with the reaction mechanism of sulphur-cure systems. The tetrasulphane groups of the TESPT are rubber reactive and react in the presence of accelerator at elevated temperatures, i.e.140 -260°C, with or without elemental sulphur being present, to form crossIinks in rubbers containing chemically active double bonds for example styrene-butadiene rubber (SBR) and polybutadiene rubber (BR) .. SBR and BR rubber compounds containing 60 phr of TESPT pre-treated silica nanofiller were prepared. The silica particles were fully dispersed in the rubber, which was cured primarily by using sulphur in TESPT. The reaction between the tetrasulphane groups of TESPT and the rubbers was optimised by incorporating different accelerators and activators in the rubber. The mechanical properties of the rubber vulcanisates such as hardness, tear strength, tensile strength, elongation at break, stored' energy density at break, abrasion resistance, modulus and cyclic fatigue life were increased significantly when the treated silica filler was added. The need for the accelerator and activator was dependent on the composition of the rubber. Interestingly, the rubbers were fully cured without the use of elemental sulphur, secondary accelerator and secondary activator. As a result, a substantial reduction in the use of the curing chemicals was achieved without compromising the important properties of rubber compounds which are essential for maintaining long life and good performance of industrial rubber products in service. This approach has also helped to improve health and safety within the workplace and minimise harm to the enviromnent.Furthermore, a significant cost saving was achieved after reducing the number of curing chemicals in the rubber
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Enhancing performance, durability and service life of industrial rubber products by silica and silane fillers
2007Co-Authors: Li WangAbstract:Typical rubber compounds used to manufacture industrial products such as tyres, hoses, conveyor belts, acoustics, shock pads, and Engine Mountings contain up to eight classes of chemical additives· including curing agents, accelerators, activators, processing aids, and antidegradants. The cure systems in these articles often consists of primary and secondary accelerators, primary and secondary activators, and elemental sulphur. Recent legislation impacting upon the working environment, safety and health has imposed a considerable burden on the manufacturers of rubber compounds to meet various obligations. The selection of raw materials and manufacturing processes that do not harm the environment is of great importance. A novel technique for preparing rubber formulations using crosslinking nanofillers such as silanised precipitated silica has been developed in this research. The silica surfaces were pre-treated with bis[3-triethoxysilylpropyl-] tetrasulphane coupling agent (TESPT).· TESPT is a sulphur containing bifunctional organosilane which chemically adheres silica to rubber and also prevents silica from interfering with the reaction mechanism of sulphur-cure systems. The tetrasulphane groups of the TESPT are rubber reactive and react in the presence of accelerator at elevated temperatures, i.e.140 -260°C, with or without elemental sulphur being present, to form crossIinks in rubbers containing chemically active double bonds for example styrene-butadiene rubber (SBR) and polybutadiene rubber (BR) .. SBR and BR rubber compounds containing 60 phr of TESPT pre-treated silica nanofiller were prepared. The silica particles were fully dispersed in the rubber, which was cured primarily by using sulphur in TESPT. The reaction between the tetrasulphane groups of TESPT and the rubbers was optimised by incorporating different accelerators and activators in the rubber. The mechanical properties of the rubber vulcanisates such as hardness, tear strength, tensile strength, elongation at break, stored' energy density at break, abrasion resistance, modulus and cyclic fatigue life were increased significantly when the treated silica filler was added. The need for the accelerator and activator was dependent on the composition of the rubber. Interestingly, the rubbers were fully cured without the use of elemental sulphur, secondary accelerator and secondary activator. As a result, a substantial reduction in the use of the curing chemicals was achieved without compromising the important properties of rubber compounds which are essential for maintaining long life and good performance of industrial rubber products in service. This approach has also helped to improve health and safety within the workplace and minimise harm to the enviromnent.Furthermore, a significant cost saving was achieved after reducing the number of curing chemicals in the rubber.EThOS - Electronic Theses Online ServiceAvon VMS UK : Avon Automotive UKGBUnited Kingdo
Dúlovcová Gabriela - One of the best experts on this subject based on the ideXlab platform.
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Powertrain Mountings in a Car Body
Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018Co-Authors: Dúlovcová GabrielaAbstract:The main aim of this thesis is to give reasons and describe different conceptions of Engine Mountings that eliminate vibrations of powertrain in a car body of personal vehicle. Another part is a comparison of particular conceptions from construction views and features. At the end of the thesis, there is assessment and designed possible future development
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Powertrain Mountings in a Car Body
Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018Co-Authors: Dúlovcová GabrielaAbstract:Hlavným cieľom tejto práce je zdôvodniť a popísať rôzne koncepcie lôžok, ktoré eliminujú vibrácie pohonnej jednotky v karosérii u osobných automobilov. Ďalšou časťou je porovnanie jednotlivých koncepcií z konštrukčného hľadiska a vlastností. V závere práce je ich zhodnotenie a navrhnutý možný budúci vývoj.The main aim of this thesis is to give reasons and describe different conceptions of Engine Mountings that eliminate vibrations of powertrain in a car body of personal vehicle. Another part is a comparison of particular conceptions from construction views and features. At the end of the thesis, there is assessment and designed possible future development.
Waleed Fekry Faris - One of the best experts on this subject based on the ideXlab platform.
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evaluation of elastomeric models for Engine Mountings applications
International Journal of Vehicle Noise and Vibration, 2015Co-Authors: Ismail Ladipo, Fadly Jashi Darsivan, Waleed Fekry FarisAbstract:The requirements of modern vehicle Engine vibration isolation systems have been upgraded from the traditional passive mode to semi-active mode or active mode. With the relative advantages of semi-active mode over active mode and passive mode, the dynamic analysis of the behaviours of elastomers when used in the semi-active mode requires more attention. This research compares the use of a three-parameter classic model and a four-parameter model on the isolation performance of elastomers. Using an analytically developed mathematical model, the effect of modifying the classic three-parameter model will be shown in the simulation results of the transmissibility properties of elastomeric mounts. The results show higher vibration isolation effects using the four-parameter model. The four-parameter elastomeric mounts have higher damping characteristics which is needed for elastomeric mounts at resonance frequency. These results will be incorporated into the study of the effect of varying the dynamic performance of elastomers in future research.
Saad Fazidah - One of the best experts on this subject based on the ideXlab platform.
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Dynamic characterisation of elastomeric Engine mounts of different geometry used in automotive industry: simulation approach
'Inderscience Publishers', 2010Co-Authors: Faris, Waleed Fekry, Saad FazidahAbstract:Generally, the vehicle Engine mounting system consists of an Engine as the vibration source and several mounts connected to the vehicle structure. The modern Engine mounting systems have been successfully used to isolate the driver and passenger from both noise and vibration generated by the Engine. However, there is still a need to improve the performance of Engine mounting systems because of the requirements of vibration and noise level isolation for passenger cars and also because of the modern car designs that need lighter bodies and more power-intensive Engines. Such a weight reduction and increased power requirements will often have adverse effects on vibratory behaviour that it will increase the vibration and noise level. This study is focusing on the current elastomeric Engine mounts of different geometry and will also characterise the dynamic properties of elastomeric Engine mount. This will be done by having parametric study of different Engine Mountings. The analysis of Engine mounting rubber components should be accompanied by the vibration analysis of the Engine mount system. This research opens up a passage to researchers to study and improve the elastomeric Engine mount
Ismail Ladipo - One of the best experts on this subject based on the ideXlab platform.
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evaluation of elastomeric models for Engine Mountings applications
International Journal of Vehicle Noise and Vibration, 2015Co-Authors: Ismail Ladipo, Fadly Jashi Darsivan, Waleed Fekry FarisAbstract:The requirements of modern vehicle Engine vibration isolation systems have been upgraded from the traditional passive mode to semi-active mode or active mode. With the relative advantages of semi-active mode over active mode and passive mode, the dynamic analysis of the behaviours of elastomers when used in the semi-active mode requires more attention. This research compares the use of a three-parameter classic model and a four-parameter model on the isolation performance of elastomers. Using an analytically developed mathematical model, the effect of modifying the classic three-parameter model will be shown in the simulation results of the transmissibility properties of elastomeric mounts. The results show higher vibration isolation effects using the four-parameter model. The four-parameter elastomeric mounts have higher damping characteristics which is needed for elastomeric mounts at resonance frequency. These results will be incorporated into the study of the effect of varying the dynamic performance of elastomers in future research.