Simulation study on transverse vibration for automotive absorber

• Main Author: Norazni, Nor Shazwan Azrul
• Format: Thesis
• Language: English; English
• Published: 2017
• Subjects: T Technology (General); TL Motor vehicles. Aeronautics. Astronautics
• Online Access: http://eprints.utem.edu.my/id/eprint/20532/1/Simulation%20Study%20On%20Transverse%20Vibration%20For%20Automotive%20Absorber.pdf; http://eprints.utem.edu.my/id/eprint/20532/2/Simulation%20study%20on%20transverse%20vibration%20for%20automotive%20absorber.pdf; http://eprints.utem.edu.my/id/eprint/20532/; https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=105946

Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two parts. In addition, suspension systems are used for keeping vehicle occupants comfortable and reasonably well isolated from road noise, bumps, and vibrations. However, most of existing works on the suspension system especially the mathematical modelling models considers only the performance due to longitudinal direction. In order to realize the limitations of conventional suspensions in terms of shock absorption and vibration isolation along the longitudinal direction, therefore, transmissibility analysis of automotive absorber in transverse direction will be helpful to make a better understanding the behaviour of suspension system. The main objective of this study is therefore to modified existing mathematical model of automotive suspension to characterize the transmissibility performance that called transverse vibration model. Mathematical models for transmissibility are developed by using two different approaches: (i) lumped mass model and (ii) finite rod model. The first approach uses assumption of massless suspension absorber where the systems are simply modelled by using spring and damper elements. The second approach employs impedance technique derived from wave propagation across a finite rod model. In this approach, the internal resonance was predicted. It found that the wave effect in the distributed parameter suspension absorber have the potential to reduce the performance of the vibration absorber. The transmissibility for a wave effect for the transverse vibration model has a peak at a natural frequency and it is close to the fundamental resonance. Furthermore, the finding also revealed that transmissibility for the wave effect in the transverse vibration model is greater at higher frequency range. The mathematical model developed in this study proved capable of representing the transmissibility behavior of the transverse vibration model without the need to use physical test such as experimental testing. Last but not least, the parametric study also discussed in this thesis.