The Experts below are selected from a list of 8157 Experts worldwide ranked by ideXlab platform

Michael D Gilchrist - One of the best experts on this subject based on the ideXlab platform.

  • Optimised Design of nested oblong tube energy absorbers under lateral impact loading
    International Journal of Impact Engineering, 2008
    Co-Authors: A G Olabi, Edmund Morris, M S J Hashmi, Michael D Gilchrist
    Abstract:

    Abstract Dynamic lateral crushing of mild steel (DIN 2393) nested tube systems was conducted using a ZWICK ROELL impact tester. The tests were performed with impact velocities ranging between 3 and 5 m/s, achieved using a fixed mass impinging onto the specimens under the influence of gravity. The various nested tube systems consisted of one standard and one Optimised Design. Their crushing behaviour and energy absorption capabilities were obtained and analysed. In addition to the experimental work, numerical simulations using the explicit code LS-DYNA were conducted; boundary conditions matching those observed in experiments were applied to the models. Results from the numerical method were compared against those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the formation of plastic hinges and the validity of strain rate parameters used in the Cowper Symonds relation. It was found that the Optimised energy absorbers exhibited a more desirable force–deflection response than their standard counterparts due to a simple Design modification which was incorporated in the Optimised Design.

  • Optimised Design of nested circular tube energy absorbers under lateral impact loading
    International Journal of Mechanical Sciences, 2008
    Co-Authors: A G Olabi, Edmund Morris, M S J Hashmi, Michael D Gilchrist
    Abstract:

    Abstract Arrangements of mild steel (DIN 2393) nested tubes were laterally crushed by dynamic loading. The tests were performed with impact velocities ranging between 3 and 5 m/s, using a fixed mass impinging onto the specimens under the influence of gravity. Two arrangements of nested tube systems were considered; one standard and one Optimised Design. Their crushing behaviour and energy absorption capabilities were analysed experimentally and simulated numerically using the explicit code LS-DYNA. Results from the numerical analyses were compared to those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the validity of strain rate parameters used in the Cowper–Symonds relation. It was shown that the Optimised energy absorber exhibited a more desirable force–deflection response than the standard arrangement due to a simple Design modification that involved mild steel cylindrical dampers.

A G Olabi - One of the best experts on this subject based on the ideXlab platform.

  • Optimised Design of nested oblong tube energy absorbers under lateral impact loading
    International Journal of Impact Engineering, 2008
    Co-Authors: A G Olabi, Edmund Morris, M S J Hashmi, Michael D Gilchrist
    Abstract:

    Abstract Dynamic lateral crushing of mild steel (DIN 2393) nested tube systems was conducted using a ZWICK ROELL impact tester. The tests were performed with impact velocities ranging between 3 and 5 m/s, achieved using a fixed mass impinging onto the specimens under the influence of gravity. The various nested tube systems consisted of one standard and one Optimised Design. Their crushing behaviour and energy absorption capabilities were obtained and analysed. In addition to the experimental work, numerical simulations using the explicit code LS-DYNA were conducted; boundary conditions matching those observed in experiments were applied to the models. Results from the numerical method were compared against those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the formation of plastic hinges and the validity of strain rate parameters used in the Cowper Symonds relation. It was found that the Optimised energy absorbers exhibited a more desirable force–deflection response than their standard counterparts due to a simple Design modification which was incorporated in the Optimised Design.

  • Optimised Design of nested circular tube energy absorbers under lateral impact loading
    International Journal of Mechanical Sciences, 2008
    Co-Authors: A G Olabi, Edmund Morris, M S J Hashmi, Michael D Gilchrist
    Abstract:

    Abstract Arrangements of mild steel (DIN 2393) nested tubes were laterally crushed by dynamic loading. The tests were performed with impact velocities ranging between 3 and 5 m/s, using a fixed mass impinging onto the specimens under the influence of gravity. Two arrangements of nested tube systems were considered; one standard and one Optimised Design. Their crushing behaviour and energy absorption capabilities were analysed experimentally and simulated numerically using the explicit code LS-DYNA. Results from the numerical analyses were compared to those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the validity of strain rate parameters used in the Cowper–Symonds relation. It was shown that the Optimised energy absorber exhibited a more desirable force–deflection response than the standard arrangement due to a simple Design modification that involved mild steel cylindrical dampers.

B. Clive - One of the best experts on this subject based on the ideXlab platform.

  • Optimisation of concentrator in the Solar Photonic Optoelectronic Transformer: Optical gain analysis
    IET Conference on Renewable Power Generation (RPG 2011), 2011
    Co-Authors: F. Muhammad-sukki, R. Ramirez-iniguez, S. G. Mcmeekin, B. G. Stewart, B. Clive
    Abstract:

    The Solar Photonic Optoelectronic Transformer (SPOT) is one of the components of the SolarBrane, a Building Integrated Photovoltaic (BIPV) system developed by SolarEmpower Ltd. Recently, an Optimised Design for the optical concentrator in the SPOT has been proposed to further improve its performance. The Optimised Design uses a dielectric totally internally reflecting concentrator (DTIRC) based on the maximum concentration method (MCM). Firstly this paper, provides an overview of SolarBrane followed by the Optimised Design of the SolarBrane concentrator indicating the geometrical concentration gain improvement when compared to the current Design. An optical gain simulation is then presented, showing the angular analysis of the Optimised concentrator in two cases; by varying the front surface arc angle and changing the half-acceptance angle of the DTIRC. From the simulation study, it can be concluded that the Optimised Design provides higher optical gain when compared with the existing Design.

  • Optimisation of concentrator in the Solar Photonic Optoelectronic Transformer: Optical gain analysis
    IET Conference on Renewable Power Generation (RPG 2011), 2011
    Co-Authors: F. Muhammad-sukki, R. Ramirez-iniguez, S. G. Mcmeekin, B. G. Stewart, B. Clive
    Abstract:

    The Solar Photonic Optoelectronic Transformer (SPOT) is one of the components of the SolarBrane, a Building Integrated Photovoltaic (BIPV) system developed by SolarEmpower Ltd. Recently, an Optimised Design for the optical concentrator in the SPOT has been proposed to further improve its performance. The Optimised Design uses a dielectric totally internally reflecting concentrator (DTIRC) based on the maximum concentration method (MCM). Firstly this paper, provides an overview of SolarBrane followed by the Optimised Design of the SolarBrane concentrator indicating the geometrical concentration gain improvement when compared to the current Design. An optical gain simulation is then presented, showing the angular analysis of the Optimised concentrator in two cases; by varying the front surface arc angle and changing the half-acceptance angle of the DTIRC. From the simulation study, it can be concluded that the Optimised Design provides higher optical gain when compared with the existing Design. (6 pages)

Edmund Morris - One of the best experts on this subject based on the ideXlab platform.

  • Optimised Design of nested oblong tube energy absorbers under lateral impact loading
    International Journal of Impact Engineering, 2008
    Co-Authors: A G Olabi, Edmund Morris, M S J Hashmi, Michael D Gilchrist
    Abstract:

    Abstract Dynamic lateral crushing of mild steel (DIN 2393) nested tube systems was conducted using a ZWICK ROELL impact tester. The tests were performed with impact velocities ranging between 3 and 5 m/s, achieved using a fixed mass impinging onto the specimens under the influence of gravity. The various nested tube systems consisted of one standard and one Optimised Design. Their crushing behaviour and energy absorption capabilities were obtained and analysed. In addition to the experimental work, numerical simulations using the explicit code LS-DYNA were conducted; boundary conditions matching those observed in experiments were applied to the models. Results from the numerical method were compared against those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the formation of plastic hinges and the validity of strain rate parameters used in the Cowper Symonds relation. It was found that the Optimised energy absorbers exhibited a more desirable force–deflection response than their standard counterparts due to a simple Design modification which was incorporated in the Optimised Design.

  • Optimised Design of nested circular tube energy absorbers under lateral impact loading
    International Journal of Mechanical Sciences, 2008
    Co-Authors: A G Olabi, Edmund Morris, M S J Hashmi, Michael D Gilchrist
    Abstract:

    Abstract Arrangements of mild steel (DIN 2393) nested tubes were laterally crushed by dynamic loading. The tests were performed with impact velocities ranging between 3 and 5 m/s, using a fixed mass impinging onto the specimens under the influence of gravity. Two arrangements of nested tube systems were considered; one standard and one Optimised Design. Their crushing behaviour and energy absorption capabilities were analysed experimentally and simulated numerically using the explicit code LS-DYNA. Results from the numerical analyses were compared to those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the validity of strain rate parameters used in the Cowper–Symonds relation. It was shown that the Optimised energy absorber exhibited a more desirable force–deflection response than the standard arrangement due to a simple Design modification that involved mild steel cylindrical dampers.

M S J Hashmi - One of the best experts on this subject based on the ideXlab platform.

  • Optimised Design of nested oblong tube energy absorbers under lateral impact loading
    International Journal of Impact Engineering, 2008
    Co-Authors: A G Olabi, Edmund Morris, M S J Hashmi, Michael D Gilchrist
    Abstract:

    Abstract Dynamic lateral crushing of mild steel (DIN 2393) nested tube systems was conducted using a ZWICK ROELL impact tester. The tests were performed with impact velocities ranging between 3 and 5 m/s, achieved using a fixed mass impinging onto the specimens under the influence of gravity. The various nested tube systems consisted of one standard and one Optimised Design. Their crushing behaviour and energy absorption capabilities were obtained and analysed. In addition to the experimental work, numerical simulations using the explicit code LS-DYNA were conducted; boundary conditions matching those observed in experiments were applied to the models. Results from the numerical method were compared against those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the formation of plastic hinges and the validity of strain rate parameters used in the Cowper Symonds relation. It was found that the Optimised energy absorbers exhibited a more desirable force–deflection response than their standard counterparts due to a simple Design modification which was incorporated in the Optimised Design.

  • Optimised Design of nested circular tube energy absorbers under lateral impact loading
    International Journal of Mechanical Sciences, 2008
    Co-Authors: A G Olabi, Edmund Morris, M S J Hashmi, Michael D Gilchrist
    Abstract:

    Abstract Arrangements of mild steel (DIN 2393) nested tubes were laterally crushed by dynamic loading. The tests were performed with impact velocities ranging between 3 and 5 m/s, using a fixed mass impinging onto the specimens under the influence of gravity. Two arrangements of nested tube systems were considered; one standard and one Optimised Design. Their crushing behaviour and energy absorption capabilities were analysed experimentally and simulated numerically using the explicit code LS-DYNA. Results from the numerical analyses were compared to those obtained from experiments. An over-prediction in force–deflection responses was obtained from the numerical code. An attempt was made to explain this inconsistency on the basis of the validity of strain rate parameters used in the Cowper–Symonds relation. It was shown that the Optimised energy absorber exhibited a more desirable force–deflection response than the standard arrangement due to a simple Design modification that involved mild steel cylindrical dampers.