The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
K. Y. Lam - One of the best experts on this subject based on the ideXlab platform.
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Response spectrum of underground Protective Structures
Finite Elements in Analysis and Design, 1994Co-Authors: W. A. M. Alwis, K. Y. LamAbstract:Abstract The rigid-body response of underground Protective Structure is analyzed adopting a single-degree-of-freedom model. A recently proposed decoupling procedure is used to accomodate the Structure-medium interaction. A response spectrum that describes the internal shock environment is derived as a simple closed form expression. This spectrum can be used for preliminary design and cost optimization studies.
Nimal Perera - One of the best experts on this subject based on the ideXlab platform.
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Performance of a Rollover Protective Structure for a Bulldozer
Journal of Engineering Mechanics, 2009Co-Authors: David Thambiratnam, Brian Clark, Nimal PereraAbstract:Rollover Protective Structures (ROPS) are safety devices fitted to heavy vehicles to provide protection to the operator during an accidental rollover. At present, ROPS design standards require full-scale destructive testing, which can be expensive, time consuming, and unsuitable for small companies. More economical analytical methods would require an understanding on postyield behavior and energy absorption capacity of ROPS. With this in mind, this paper treats a bulldozer ROPS using experimental and analytical techniques to generate research information that will enable development of analytical design guidance and enhance safety.
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dynamic response of a rollover Protective Structure
Faculty of Built Environment and Engineering, 2008Co-Authors: David Thambiratnam, Brian Clark, Nimal PereraAbstract:Roll Over Protective Structures (ROPS) are safety devices fitted to heavy vehicles to provide protection to the operator during an accidental roll over. At present, ROPS design standards require full scale destructive testing which can be expensive, time consuming and unsuitable for small companies. More economical analytical methods are not permitted due to a lack of understanding on post yield behaviour and energy absorption capacity of ROPS. With this in mind, a research project was carried out to comprehensively investigate ROPS behaviour using analytical techniques supported by experiments. This paper presents the dynamic impact analysis of a bulldozer ROPS using calibrated finite element models. Results indicate that (i) ROPS posts have significant influence on the energy absorbing capacity,(ii) dynamic amplifications in energy could be up to 25% and (iii) stiffer ROPS cause high peak decelerations that may be detrimental to the operator. The feasibility of using analytical techniques for evaluating ROPS performance has also been demonstrated.
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dynamic response of a rollover Protective Structure
Computer-aided Civil and Infrastructure Engineering, 2008Co-Authors: David Thambiratnam, Brian Clark, Nimal PereraAbstract:Roll Over Protective Structures (ROPS) are safety devices fitted to heavy vehicles to provide operator protection during an accidental roll over. Currently, ROPS design standards require full-scale destructive testing that can be expensive, time consuming, and unsuitable for small companies. More economical analytical methods are not permitted due to a lack of understanding of post yield behavior and the energy absorption capacity of ROPS. To address this, a comprehensive research project was undertaken to investigate ROPS behavior using analytical techniques supported by experiments. This paper presents the dynamic impact analysis of a bulldozer ROPS using calibrated finite element models. Results indicate that: 1) ROPS posts have significant influence on the energy-absorbing capacity, 2) dynamic amplifications in energy could be up to 25%, 3) stiffer ROPS cause high peak decelerations that may be detrimental to the operator, and 4) analytical techniques may be used for evaluating ROPS performance.
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Enhancing the impact energy absorption in roll over Protective Structures
International Journal of Crashworthiness, 2008Co-Authors: Brian Clark, David Thambiratnam, Nimal PereraAbstract:This article examines the feasibility of including a cost-effective supplementary energy absorbing device in the form of a thin-walled conical tube into the framework of a roll over Protective Structure to enhance its energy absorption capacity and hence to enhance safety for the operator. Dynamic impact analysis was carried out to obtain the response of this structural system for different roll slope angles and wall thickness of the tube. Results have shown that the inclusion of this device promoted an enhanced level of occupant safety by enhancing the energy absorption and reducing the amount of plastic deformation sustained by the roll over Protective Structure as well as reducing the severity of the peak decelerations transferred to the vehicle cabin during such an event.
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Analytical and Experimental Investigation of the Behaviour of a Rollover Protective Structure
The Structural engineer, 2006Co-Authors: Brian Clark, David Thambiratnam, Nimal PereraAbstract:Rollover Protective Structures play a vital role in protecting the operators of large earthmoving machines which are commonly used in the rural and mining sectors. These Structures typically consist of a moment resisting steel frame that is required to withstand the impact forces sustained by the vehicle during a rollover and provide a survival space for the operator during such an event. Recent advances in analytical modelling techniques have made it possible to model accurately the response behaviour of these types of Structures when subjected to load and energy requirements according to current performance standards adopted both in Australia and internationally. This paper is concerned with the response behaviour of a rollover Protective Structure (ROPS) fitted to a 125 tonne rigid frame dump truck. Destructive experimental testing which involved the application of static loads to simulate the impact forces created during a rollover has been conducted on a ½ scale model ROPS for this particular vehicle. The testing program has involved complete instrumentation of the ROPS to enable corresponding member stresses and deflections to be recorded. In addition to this, non-linear finite element analysis has also been performed on this ROPS using the FEA software package ABAQUS version 6.3. The first stage of this computer analysis involved subjecting the ROPS to static loads about the lateral, vertical and longitudinal axes of the ROPS and comparing, results with those obtained from the experimental investigation and calibrating the computer model. Further research will involve using the calibrated finite element models to carry out dynamic simulations incorporating energy absorbing devices in the ROPS to optimize the level of energy absorption and enhance performance and operator safety.
Sam E. Rigby - One of the best experts on this subject based on the ideXlab platform.
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Design and numerical assessment of a rapid-construction corrugated steel-concrete-steel Protective Structure:
International Journal of Protective Structures, 2019Co-Authors: Sangwoo Jeon, Sam E. RigbyAbstract:A Protective Structure should be sufficiently resilient to protect its occupants from the harmful effects of an impact or explosion. In many instances, Protective Structures are also required to be...
W. A. M. Alwis - One of the best experts on this subject based on the ideXlab platform.
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Response spectrum of underground Protective Structures
Finite Elements in Analysis and Design, 1994Co-Authors: W. A. M. Alwis, K. Y. LamAbstract:Abstract The rigid-body response of underground Protective Structure is analyzed adopting a single-degree-of-freedom model. A recently proposed decoupling procedure is used to accomodate the Structure-medium interaction. A response spectrum that describes the internal shock environment is derived as a simple closed form expression. This spectrum can be used for preliminary design and cost optimization studies.
Sangwoo Jeon - One of the best experts on this subject based on the ideXlab platform.
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Design and numerical assessment of a rapid-construction corrugated steel-concrete-steel Protective Structure:
International Journal of Protective Structures, 2019Co-Authors: Sangwoo Jeon, Sam E. RigbyAbstract:A Protective Structure should be sufficiently resilient to protect its occupants from the harmful effects of an impact or explosion. In many instances, Protective Structures are also required to be...
