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

为了在轻量化车辆中构建一种节能的全局设计方法，我们与四位研究者共同开展了以下四个项目1。多振动模态柔性车身建模方法及其运动振动控制。2 .汽车车身轻量化试验模态分析及减重设计方法的开发。铁道车辆和汽车的悬挂控制。综合控制主动四轮转向和单个车轮转矩对车辆操纵和稳定性的影响。在第一个问题上，很难将高刚度cad体的振动控制方法应用于柔性cad体。为此，提出了一种新的多阶振动模态建模方法，即采用降阶质量模型来表示振动模态。将建模方法与LQ控制理论相结合，对具有弹跳、横摇、俯仰、弯曲、扭转等6种振动模式的柔性驾驶室体进行了有效控制，验证了该方法是许多柔性结构控制的常用方法。提出了一种框架结构减重优化设计方法，并通过试验模态分析验证了方法的有效性。第三课题研制了一种节能主动悬架系统。适用于轨道车辆和机动车的主动控制。第四主题研究了几种不同的控制输入组合对改善车辆操纵和稳定性的有效性。在1999年至2001年的三年中，四位研究者进行了深入的接触和讨论，解决了许多问题，并尝试了提出的课题，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