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本文以负载模态质量大幅度变化的电液位置伺服系统为例，分析了由负载参数变化而引起系统输出特性变化的机理，介绍了运用结构不变性原理补偿负载模态质量变化、以及提高系统对输入信号响应速度的方法。
In this paper, the electro-hydraulic position servo system with large load modal quality change is taken as an example to analyze the mechanism of the change of system output characteristics caused by the change of load parameters. The principle of structure invariance is introduced to compensate the load modal quality changes, Method of responding to input signal speed.