2008 年 2 巻 1 号 p. 177-187
In recent years, the needs to achieve the eigenvalue optimization considering the NVH performance increase in the initial design of suspension systems. This paper presents an application of MBD (Multi-Body Dynamics) model to dynamic property optimization. A vehicle suspension is modeled by MBD and the vibration properties are analyzed based on the linearization of the system equation. The model can solve the dynamic properties as modal parameters such as natural frequencies, modal dampings and mode shapes. The targets of this model are to calculate the eigenvalue sensitivity with respect to each design parameter (mass, stiffness, damping and geometry of the link) and to optimize the eigenvalue by combining the structural modifications of these high sensitivity elements. By the sensitivity analysis, we can make sure which elements contribute to the dynamic characteristics of the system. The feasibility of the dynamic property optimization is examined by applying the presented approach to the suspension system model. The structural modification is carried out based on the sensitivity analysis in order to attain the required natural frequency change. As a result it is shown that the natural frequency is optimized based on the presented sensitivity analysis.
