Abstract
This study is about the impact of the performance and the sensitivity analysis for parameters of the torsion bar suspension in the electric sight-seeing car, which the authors’ laboratory designed and which is used in the authors’ university. The suspension stiffness was calculated by using the virtual work principle, the vector algebra, and tensor of finite rotation methods and was verified by the ADAMS software. Based on the random vibration analysis method, the paper analyzed the dynamic tire load (DTL), suspension working space (SWS), and comfort performance parameters. For the purpose of decreasing the displacement of the suspension and limiting the frequency of impacting the stop block, the paper examined the three parameters and optimized the basic parameters of the torsion bar. The results show that the method achieves a great effect and contributes an accurate value for the general layout design.
Highlights
The common problems of vehicles, including suspension static deformation, front suspension weakness, tendency of frequently hitting stop blocks, and location angle of front wheels changing out of its limits, are mainly caused by excessively low biased frequency design value and suspension stiffness.Since the year 2000, some conference papers focus on small but specific studies; Wang et al [1] explored kinematics characteristics of suspension with double trailing arms for light off-road vehicles; they found that the double trailing arm lengths, the angles between double trailing arms, horizontal/vertical plane, and bushing stiffness of the double trailing arms linking with frame are four major parameters that affect the caster and front-wheel steering angle
Cherian et al [4] developed a nonlinear model of a double wishbone suspension and investigated the effects of variation of suspension parameter on the transmission and distribution of tire forces acting on the wheel spindle to the steering system and the vehicle chassis
In order to establish a reasonable model, this paper simplified and assumed the suspension as follows: (1) All components of the system are rigid bodies; (2) all connections between components in the system are simplified as hinges; (3) internal clearance is negligible; (4) ignoring the deformation of the guide rod and the absorber is simplified to a damping and linear spring; (5) the friction force between the kinematic pairs in the system is ignored, and the connection between the motion pairs is rigid; (6) the body of the car does not move relative to the ground and the tire is simplified as a rigid body
Summary
The common problems of vehicles, including suspension static deformation, front suspension weakness, tendency of frequently hitting stop blocks, and location angle of front wheels changing out of its limits, are mainly caused by excessively low biased frequency design value and suspension stiffness. Tian et al [2] optimized analysis of the wheeled armored vehicle double wishbone independent suspension system. Cherian et al [4] developed a nonlinear model of a double wishbone suspension and investigated the effects of variation of suspension parameter on the transmission and distribution of tire forces acting on the wheel spindle to the steering system and the vehicle chassis. Considering the road situation as random vibration, the power spectral function was used to establish correlation function as one of constraint conditions to optimize calculating basic size of torsion bar for increasing suspension stiffness, decreasing frequency of hitting stop block, and limiting the change of location angle of front wheels
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