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This paper presents a new method which adopts the theory of multi-rigid body system dynamics to solve the kinematics of multi-axle steering system of heavy-duty vehicle, introduces several new concepts such as component coordinate system, intermediate datum coordinate system, train component analysis method, and so on, develops a kinematics analysis software for steering system, takes QY80 auto-crane as an example, analyses the kinematics of four-axle steering system. Basing on the kinematics analysis, this paper creates the mathematical model of optimization for the steering rocker mechanism, chooses minimization adoptive random search method to develop an optimization design microcomputer program, and optimizes each design variable finally.

In this paper, the experimental modal analysis system used for truck cabs is introduced. Based on the description of the theory for new method, the composition, software development and characteristics of this system are demonstrated. Finally, by such system experimental modal analysis of a truck cabs is described.

The method of time series analysis is one of the most important time domain modal analysis techniques, however, its application to automotive experimental modal analysis is restricted by lack of an effective way to determine order of the time series model, By G-transformation, a new criterion for determination of model order is presented in this paper, so the obstacle is overcome. Besides, a new algorithm for estimation of time series model is presented and two kinds of models are used for identification of modal parameters, therefore the method of time series analysis can be applied better to automotive modal analysis. Last, an example of identifying automobile frame by our method is given. The identification results are better in conformity with the results of frequency domain method.