Suspension systems are essential in vehicles to provide both passenger comfort and vibration isolation from road bumps. It is necessary to develop a comprehensive numerical model to study and analyze the dynamic behavior of these systems. This study aims to introduce a comprehensive finite element model to investigate the dynamic behavior of double wishbone vehicle suspension system considering links flexibility. Plane frame element based on Timoshenko beam theory (TBT) is adopted to model the suspension links. Flexibility of the joints connecting the suspension links are modeled using the revolute joint element. Viscoelastic, viscous and proportional damping models are considered to simulate the damping effect. Newmark technique, as unconditionally stable technique is adopted to solve the finite element dynamic equation of motion. The developed procedure is verified by comparing the obtained results with the available analytical and numerical results and an excellent agreement is found. To demonstrate the effectiveness of the developed model, parametric studies are conducted to show the effects of the road bump profiles, the vehicle speed, and the material damping on the dynamic behavior of suspension system. The obtained results are supportive in the design and manufacturing processes of such suspension systems.
Suspension systems in running vehicles keep the occupants comfortable and isolated from road noise, disturbances, and vibrations and consequently prevent the vehicle from damage and wearing. To attain comfortable and vibration isolation conditions, both material flexibility and damping should be considered in the considered suspension model. This paper presents an incremental finite element model to study and analyze the dynamic behavior of double wishbone suspension systems considering both material flexibility and damping effects. The flexibility of the suspension links are modeled with plane frame element based on Timoshenko beam hypothesis (TBH). On the other hand, the flexibility of joints connecting the suspension links together and with the vehicle chassis is modeled with the revolute joint element. To incorporate the damping effect, viscoelastic, viscous and proportional damping are considered. An incremental viscoelastic constitutive relations, suitable for finite element implementation, are developed. The developed finite element equations of motion are solved using the Newmark technique. The developed procedure is verified by comparing the obtained results with that obtained by the developed analytical solution and an excellent agreement is found. The applicability and effectiveness of the developed procedure are demonstrated by conducting parametric studies to show the effects of the road irregularities profiles, the vehicle speed, and the material damping on the transverse deflection and the resultant stresses of suspension system. Results obtained are supportive in the mechanical design, manufacturing processes of such type of structural systems.
Suspension systems play an important role in vehicles. These systems provide passenger comfort and vibration isolation from road bumps. Thus an efficient finite element model is required to study and analyze the dynamic response of these suspension systems. This paper presents a finite element model to analyze the dynamic response of double wishbone vehicle suspension system taking into consideration both links and joints flexibilities. Links are modeled using plane frame element based on Timoshenko beam theory (TBT) kinematic relations. On the other hand, the revolute joint element, developed in ANSYS, is adopted to model joints flexibility.Both internal viscoelastic and external viscous as well as the modal proportional damping models are adopted to simulate the damping effect. The resulting dynamic finite element equations of motion are solved using Newmark numerical technique. The proposed numerical methodology is checked by comparing the obtained results with the developed analytical solution and good agreement is noticed. The applicability of the proposed procedure is demonstrated by operating parametric studies to illustrate the effects of the road irregularity configurations, the vehicle travelling velocity, as well as the material damping on the dynamic response characteristics of the double wishbone suspension system. The obtained results are helpful for the mechanical design of these structural systems.
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