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一、引言多变量电液伺服加载系统常常被用来模拟被试件在实际工况下受到的载荷或其他典型载荷。这种系统的特点是:各个加载通道通过被试件联接在一起而产生相互耦合,即各个通道实际产生的加载力不仅取决于该通道的输入载荷谱,而且还与其他通道的输入载荷谱和输出加载力相关联。加载频率愈高,相关程度愈大,使加载系统各个通道难以准确地复现其给定载荷谱,情况恶劣时甚至不能正常工作。分析国内外现有的多变量电液加载系统,虽然加载点数不等,控制方式各异,但有一点却是共同的:其中绝大多数都是将多
I. INTRODUCTION Multivariable electro-hydraulic servo loading system is often used to simulate the load or other typical load of the specimen under actual working conditions. The characteristic of this system is that each loading channel is coupled by being connected to each other, that is, the actual loading force of each channel depends not only on the input load spectrum of the channel, but also on the input load spectrum of other channels and Output loading force associated. The higher the loading frequency, the greater the degree of correlation, making it difficult for the various channels of the loading system to accurately reproduce the given load spectrum, or even not working properly in bad conditions. Analysis of the existing domestic and foreign multivariable electro-hydraulic loading system, although the loading points ranging from different control methods, but one thing is common: the vast majority of them will be more