活动一：高端论坛
演讲嘉宾、题目
l 黄向东 广汽集团汽车工程研究院院长
广汽集团自主品牌汽车研发介绍
l 阮世捷 美国福特汽车公司高级技术专家
人体生物力学方法在汽车碰撞安全中的应用研究进展
l 李理光 同济大学机械工程学院院长
基于燃烧循环的控制
l 张 农 悉尼科技大学电机、机械和机械电子系统工程学院常务副院长
Hydraulically interconnected vehicle suspension
l 高云凯 同济大学车身技术研究所所长
汽车车门关门能量分析
时间、地点
2010年12月23日下午14：30—17：30， 汽车科技大楼2楼
活动二：学术报告
演讲嘉宾、题目
l 郭中阳 博士
汽车车载ECU开发
l 王 杜 博士
汽车智能钥匙系统
时间、地点
2010年12月30日上午9：00—11：30，汽车科技大楼1308
欢迎广大师生参加！
广东省汽车工程重点实验室
华南理工大学机械与汽车工程学院
附：部分演讲内容介绍
1. Hydraulically interconnected vehicle suspension
Part 1: Mechanism Description and Modeling
A novel approach for the frequency domain analysis of a vehicle fitted with a general hydraulically interconnected suspension (HIS) system is presented. Ideally, interconnected suspensions have the capability, unique among passive systems, to provide stiffness and damping characteristics dependent on the all-wheel suspension mode in operation. A basic, lumped mass, 4-DOF half-car model is used to illustrate the proposed methodology. The mechanical-fluid boundary condition in the double-acting cylinders is modeled as an external force on the mechanical system and a moving boundary on the fluid system. The fluid system itself is modeled using the hydraulic impedance method, in which the relationships between the dynamic fluid states, i.e., pressures and flows, at the extremities of a single fluid circuit are determined by the transfer matrix method. A set of coupled, frequency-dependent equations, which govern the dynamics of the integrated half-car system, are then derived and the application of these equations to both free and forced vibration analysis is explained. The fluid system impedance matrix for the two general wheel-pair interconnection types – anti-synchronous and anti-oppositional – is also given. To further outline the application of the proposed methodology, an example using a typical anti-roll HIS system is illustrated. The integrated half-car system’s free vibration solutions and frequency response functions are then obtained and discussed in some detail. The presented approach provides a scientific basis for investigating the dynamic characteristics of HIS-equipped vehicles, and the results offer further confirmation that interconnected suspension schemes can provide, at least to some extent, individual control of modal stiffness and damping characteristics.
Part 2: Theoretical and Experimental Ride Analysis
The derived model for the frequency-domain analysis of vehicles with hydraulically interconnect suspension (HIS) systems is applied to the ride analysis of a four-degrees of freedom roll-plane half-car under a rough road input. The entire road surface is assumed to be a realization of a two-dimensional Gaussian homogenous and isotropic random process. The frequency responses of the half-car, in terms of bounce and roll acceleration, suspension deflection and dynamic tyre forces, are obtained under the road input of a single profile represented by its power spectral density (PSD) function. Simulation results obtained for the roll-plane half-car fitted with a hydraulically interconnected suspension and those with conventional suspensions are compared in detail. In addition, sensitivity analysis of key parameters of the hydraulically interconnected suspension to the ride performance is carried out through simulations.
The experimental validation of the analytical results of the free and forced vibrations of the roll-plane half-car is also presented. The hydraulic and mechanical system layouts, data acquisition system and the external force actuation mechanism of the test setup are described in detail. The methodology for free and forced vibration tests and the application of mathematical models to account for the effective damper valve loss are explained. The obtained free and forced vibration results of the roll-half car with different operating mean pressures; and comparisons between the testing results and those obtained from the system model with estimated key damper valve coefficients are provided. Furthermore, discussions on deficiency and the practical implications of the proposed model for the roll-plane half car; and the suggestions for future investigation are provided. Finally, the key findings of the investigation on the ride performance of the roll-plane half car are summarized.
