Scientific Research on a Global Design included Multi-Mode Vibration Control for Elastic Car Body taking the Lightweight

为了构建轻量化汽车节能的全局设计方法，与四名研究人员联合开展了以下四个项目1。本文的主要研究内容如下：1.多振型柔性车体的建模方法及其运动和振动控制。对轻量化车身进行了试验模态分析，制定了轻量化设计方法。轨道车辆和机动车辆的悬挂控制。主动四轮转向和单轮扭矩对汽车操纵稳定性的综合控制在第一个问题上，高刚度CAD车身的振动控制方法很难应用于柔性车身。为此，提出了一种新的用降阶质量模型表示多阶振动模式的建模方法。将建模方法与LQ控制理论相结合，对驾驶室车身的弯曲、扭转等六种振动模式进行了有效的控制，证实了该方法在多种柔性结构控制中的普遍应用。针对第二个课题，提出了车架结构的减重优化设计方法，并通过实验模态分析验证了该方法的有效性。课题四研究了几种不同的控制输入组合对改善车辆操纵性和稳定性的效果。从1999年到2001年的三年时间里，四位研究人员针对许多问题进行了深入的接触和讨论，并对提出的课题进行了尝试，取得了良好的效果

In order to construct a global design method in the lightweight vehicles for saving energy, the following four projects was started by joining with four investigators1. Modeling methods for flexible car bodies with multi-vibration modes and the motion and vibration control using these methods.2. Experimental modal analysis of the lightweight car body and the development of design method for reducing the weight.3. Suspension control for railroad vehicles and motorcars.4. Integrated control of active four wheel steer and individual wheel torque on vehicle handling and stability.On the first subject, it is difficult to apply the vibration control method of high stiffness cad body to a flexible one. Therefore a new modeling method was developed to indicate multi-order vibration modes using reduced-order *umped mass model. Combining the modeling method and LQ control theory, a flexible cab body with six modes of bouncing, rolling, pitching including bending and torsional vibration modes was effectively controlled It is confirmed that this approach is commonly used for many flexible structural control.On the second subject, a optimal design method for frame structures to reduce the weight was proposed and confirmed the effectiveness using experimental modal analysis.An active suspension system for saving energy was developed by the third subject. It is applicable for active control of railroad vehicles and motorcars.Effectiveness of several different combinations of control inputs for improvement of vehicle handling and stability was investigated by the fourth subject.During three years from 1999 to 2001, four investigators have deep contact and discussion to solve many problems and the proposed subjects was attempted with well results