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在控制系统中 ,存在着各种不确定因素 ,如质量、刚度、阻尼和时间滞后等 ,这些不确定因素可能使控制系统的控制效果大大降低 ,甚至造成失稳。因此如何在控制设计中考虑不确定因素 ,是将结构控制技术应用于实际工程所要解决的问题之一。可靠度分析方法提供了一个更合理、更实际的工具。应用这一分析方法 ,可以对不同控制系统 ,按统一标准 ,进行控制效果和稳定性的分析评价。本文应用二阶矩可靠度理论 ,分析不同控制系统 ,在相同的不确定因素作用下的稳定可靠度。为了说明计算方法的效果 ,本文对两个不同的设计方案组进行了可靠度比较分析。
In the control system, there are various uncertainties, such as mass, stiffness, damping and time lag, which may cause the control effect of the control system to be significantly reduced or even destabilized. Therefore, how to consider the uncertainties in the control design is one of the problems to be solved when applying the structural control technology to practical engineering. Reliability analysis provides a more rational and practical tool. Application of this analysis method, different control systems, according to a unified standard, the control effect and stability analysis and evaluation. In this paper, the second-order moment reliability theory is applied to analyze the stability of different control systems under the same uncertainties. In order to illustrate the effectiveness of the calculation method, this paper compares the reliability of two different design options.