International Journal of Vehicle Structures and Systems

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Dynamic Behaviour of a 7 DoF Passenger Car Model


Affiliations
1 Mech. Engg. Dept., Aditya Inst. of Tech. and Management, Tekkali, Andhra Pradesh, India
2 Mech. Engg. Dept., Maharishi Markandeshwar University, Mullana, India
 

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Conventional vehicle suspension systems, which are passive in nature consists of springs with constant stiffness and dampers with constant damping coefficient. These suspension systems cannot meet the characteristics such as ride comfort, road handing and suspension deflection during abnormal road conditions simultaneously. Active and semi-active suspension systems are the solutions to achieve the desired suspension characteristics. Since, active system is bulky and requires high energy for working, a semi-active suspension system is considered in the present work to analyze vehicle traversing over various road profiles for ride comfort. Mathematical model of a 7 DoF passenger car is formulated using Newton’s method. A semi-active suspension system with skyhook linear control strategy avoids the road excitations at resonant frequencies by shifting the natural frequencies of the model by varying damping coefficients based on the vehicle response for different road conditions where the excitations could be harmonic, transient and random. Modal analysis is carried out to identify the un-damped natural frequencies and mode shapes for different values of damping. The above analyses are carried out through analytical and numerical methods using MATLAB and ANSYS software respectively and the results obtained from both are in good agreement.

Keywords

Dynamic Response, Modal Analysis, Natural Frequency, Mathematical Model, ANSYS, MATLAB.
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  • Dynamic Behaviour of a 7 DoF Passenger Car Model

Abstract Views: 448  |  PDF Views: 264

Authors

S. Palli
Mech. Engg. Dept., Aditya Inst. of Tech. and Management, Tekkali, Andhra Pradesh, India
R. C. Sharma
Mech. Engg. Dept., Maharishi Markandeshwar University, Mullana, India
P. P. D. Rao
Mech. Engg. Dept., Aditya Inst. of Tech. and Management, Tekkali, Andhra Pradesh, India

Abstract


Conventional vehicle suspension systems, which are passive in nature consists of springs with constant stiffness and dampers with constant damping coefficient. These suspension systems cannot meet the characteristics such as ride comfort, road handing and suspension deflection during abnormal road conditions simultaneously. Active and semi-active suspension systems are the solutions to achieve the desired suspension characteristics. Since, active system is bulky and requires high energy for working, a semi-active suspension system is considered in the present work to analyze vehicle traversing over various road profiles for ride comfort. Mathematical model of a 7 DoF passenger car is formulated using Newton’s method. A semi-active suspension system with skyhook linear control strategy avoids the road excitations at resonant frequencies by shifting the natural frequencies of the model by varying damping coefficients based on the vehicle response for different road conditions where the excitations could be harmonic, transient and random. Modal analysis is carried out to identify the un-damped natural frequencies and mode shapes for different values of damping. The above analyses are carried out through analytical and numerical methods using MATLAB and ANSYS software respectively and the results obtained from both are in good agreement.

Keywords


Dynamic Response, Modal Analysis, Natural Frequency, Mathematical Model, ANSYS, MATLAB.

References





DOI: https://doi.org/10.4273/ijvss.9.1.12