Finite Element Based Life Prediction of A New Free Piston Linear Generator Engine Mounting

Rahman, M. M.; Ihsan, Ahmad Kamal Ariffin Mohd; Jamaludin, Nordin; Haron, Che Hasan Che

doi:10.17576/jkukm-2008-20-06

Cited by 6 publications

(7 citation statements)

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“…Four methods of strain history combination were evaluated and the absolute maximum principal method was found to be suitable for fatigue analysis. The number of cycles required to fail the spring in the case of triangular waves at 4 Hz and SAESUS time history were found to be 0.516×10 8 and 0.5271×10 8 cycles, respectively. The predicted numbers of cycles were well above the number of cycles mentioned in the design information, i.e.…”

Section: Discussionmentioning

confidence: 98%

“…There is increasing pressure in the automotive industry to reduce the time taken to bring new designs to production [1][2][3]. At the same time it is necessary for the vehicles being developed to have the right attributes such as durability and low weight in order to remain competitive [4][5][6][7][8]. In automotive companies, creating new and improved designs can give a significant competitive edge and define the success or failure of an entire product line [9].…”

Section: Introductionmentioning

confidence: 99%

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Finite Element-Based Fatigue Behaviour of Springs in Automobile Suspension

Kamal

Rahman

2014

Int. J. Automot. Mech. Eng.

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This paper presents the fatigue behaviour of springs used in shock absorbers in automobile suspension systems. SAE 9254 is considered as a spring material. Triangular waves with a frequency of 4 Hz and SAE standard suspension loading history (SAESUS) were used for fatigue analysis. Both load histories are scaled according to the maximum and minimum values of deflection, as spring height at full-bump and full-rebound, respectively. Finite element analysis was carried out using the linear static approach. Fatigue analysis was performed using the strain-life method. Absolute maximum principal and critical plane approaches gave results of reasonable accuracy, but later had a considerably longer solution time, while signed von Mises and signed shear approaches gave very conservative results. Thus the absolute maximum principal method is found to be the best suited. The results show that the spring did not fail before 4×10 5 cycles at 4 Hz for wave time history and 70,000 repeats for SAESUS time history at critical location.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Finite Element-Based Fatigue Behaviour of Springs in Automobile Suspension

Kamal

Rahman

2014

Int. J. Automot. Mech. Eng.

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“…Controlling the crash response of the vehicle without any encroachment into the survival space are the main elements of vehicle safety (Du Bois et al, 2004;Kamal & Rahman, 2012;Kamal, Rahman, & Sani, 2013). Many researchers (Ahmad, Nagel, & Thambiratnam, 2013;Ahmad & Thambiratnam, 2009;Rahman, Ariffin, Abdullah, & Jamaludin, 2007;Rahman, Ariffin, Jamaludin, Abdullah, & Noor, 2008) have been employing the finite element method to enhance the safety level of vehicles in the event of impact.…”

Section: Introductionmentioning

confidence: 99%

Energy Absorption Performance of A Rain Forest Vehicle under Frontal Impact

Ahmad¹,

Othman

2014

J MECH ENG SCI

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This paper presents a comprehensive numerical study of the crashworthy design of a rain forest vehicle (RFV) subjected to impact loading. A commercial finite element (FE) nonlinear code, LSDYNA, was employed to further evaluate the energy absorption performance of the structure under two crash scenarios; impacting a rigid wall and a rigid pole. The simulation results were used to identify the energy absorption capacity of the main subcomponent, thus facilitating crashworthiness requirements for future design improvements. The aims of this investigation were to enhance understanding of RFV behavior under impact loading and improve energy absorption capacity and safety, which will contribute towards the development of an early design stage of the RFV, and design and evaluation that may lessen the need for destructive full-scale testing. Recommendations and suggestions for improving the energy absorption capacity of RFVs have been made. A considerable improvement in energy absorption capacity has been obtained by inclusion of a supplementary device attached to the main chassis. These simplified provisions provide design guidelines that will considerably improve an operator's chances of survival during an accidental impact in the forest.

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“…Predicting the dynamic response of a vibrating system generally involves determining the equations of motion of the structure and solving them in order to find the natural frequencies and mode shapes of the system to give boundary conditions. The natural frequencies and mode shapes can then be used to predict the response due to an applied excitation [1][2][3]. For more complex systems, the equations of motion can be approximated using various deterministic modelling techniques such as finite element analysis (FEA) and dynamic stiffness techniques [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Dynamic Characteristics of Vibrating Structure With Uncertain Parameters

Khan¹,

Awari²

2014

Int. J. Automot. Mech. Eng.

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This paper is based on a study of vibrational responses of different vibrating systems with uncertain parameters. The concept of uncertainty plays an important role in the design of the practical mechanical system. So it becomes important to study its effects on the mechanical system. A large and varied amount of research has been dedicated to developing techniques which predict the dynamic responses of structures in all frequency domains and structures with uncertainty. The structural element selected in this work is the plate. The plate is considered in terms of mass, stiffness and a combination of mass and stiffness uncertainty. The dynamic characteristic of the plate with all uncertain parameters is found by using the Finite Element Method. In this paper modal and harmonic analysis of the plate is done. In modal analysis the natural frequencies and mode shapes of the plate are found. The response of a bare plate is compared with plates for which different uncertain parameters are considered. Similarly, in harmonic analysis the frequency response function of the bare plate and the plates with all uncertain parameters are compared. During comparison, it was found that due to mass uncertainty minor changes in the natural frequency and in mode shape were obtained. However, due to stiffness the natural frequency, mode shape and FRF were drastically changed. Similarly, due to a combination of mass and stiffness uncertainty drastic changes were observed in the plate response. Because of these uncertainties the complete vibrational characteristics were changed. So it becomes important to consider these uncertainties to avoid misinterpretation while designing plates.

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Finite Element Based Life Prediction of A New Free Piston Linear Generator Engine Mounting

Cited by 6 publications

References 0 publications

Finite Element-Based Fatigue Behaviour of Springs in Automobile Suspension

Finite Element-Based Fatigue Behaviour of Springs in Automobile Suspension

Energy Absorption Performance of A Rain Forest Vehicle under Frontal Impact

Prediction of Dynamic Characteristics of Vibrating Structure With Uncertain Parameters

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