基于DSP的汽车磁流变减振悬架系统控制策略设计与研究外文文献.docVIP

RUCK SUSPENSION SYSTEM OPTIMIZATION INTRODUCTION Truck suspension systems, hardware innovations for improvements, analytical investigations to improve design, techniques for testing, and computer simulation to predict performance have been described in numerous previous technical papers. Many of these investigators have been seeking, in some sense, that elusive design which might be termed an optimum suspension system. The difficulty associated with obtaining an optimal design is primarily due to the difficulty of determining the operating environment (input) and a realistic figure of merit or criterion for optimization (output). The fundamental purpose of a vehicle suspension system is to act as a vibration isolation system between the frame, chassis, passengers, and cargo, and the vibratory input caused by road or terrain irregularities. The lack of a firm deterministic definition of the profile to which a vehicle is subjected throughout its lifetime requires a statistical approach, that of random vibration. The author and others, for example ,have previously made some progress in the statistical definition of the input. It appears that a fairly realistic approximation of road or cross-country terrain can be made by assuming a white (equal probability of all frequencies) Gaussian distribution for the slope (or first special derivative). This can then be converted to a temporal input for vehicle vibration studies by accounting for the speed of the vehicle and the interrelations associated with following in-line wheels. The measure of the vibratory response or output usually associated with random vibration is mean square acceleration. Studies have indicated that the proper frequency domain weighting of mean square acceleration to account for human resonances can yield a criterion which correlates with the subjective sensation of human comfort . Sinusoidal and random test specifications for components and cargo, for example, are usually associated with accelerat