多输入多输出随机振动试验雅克比控制算法

发布时间：2018-10-11 11:37

【摘要】：研究了多输入多输出(MIMO,Multiple Input Multiple Output)随机振动试验闭环控制系统中不同元素超标现象,通过分析多输入多输出线性时不变振动系统输入与输出的频域关系,将多路信号的功率谱矩阵分解为自功率谱、相干系数和相位差等元素,推导出能表示输入输出元素微分关系的雅克比控制矩阵,提出了一种全新的MIMO随机振动试验雅克比控制算法。该算法对功率谱矩阵中元素超标现象进行有针对性地控制,其控制收敛速度快、精度高。在多轴振动台上进行两输入两输出振动控制实验,分别设定参考谱的各元素,设置容差带,然后进行频响函数估计,利用新算法对X轴和Y轴的振动进行控制,结果表明利用雅克比控制算法可将自谱、相干系数与相位等均控制在工程标准范围内,控制效果良好。
[Abstract]:In this paper, the phenomenon of overloading of different elements in the closed-loop control system of MIMO,Multiple Input Multiple Output) random vibration test is studied. The frequency-domain relationship between input and output of multi-input multiple-output linear time-invariant vibration system is analyzed. The power spectrum matrix of multichannel signal is decomposed into self-power spectrum, coherence coefficient and phase difference, and the Jacobian control matrix which can represent the differential relation of input and output elements is derived. A novel Jacobian control algorithm for MIMO random vibration test is proposed. The algorithm has the advantages of fast convergence and high precision in controlling the element over-standard phenomenon in the power spectrum matrix. Two input and two output vibration control experiments are carried out on the multi-axis vibration table. Each element of the reference spectrum is set, tolerance band is set, and the frequency response function is estimated. The vibration of X axis and Y axis is controlled by the new algorithm. The results show that the self-spectrum, coherence coefficient and phase can be controlled within the range of engineering standard by using the Jacobian control algorithm, and the control effect is good.
【作者单位】：江苏大学汽车工程研究院;南京航空航天大学振动工程研究所;
【基金】：江苏省高校自然科学研究面上项目(16KJD460001) 江苏大学高级人才科研启动基金资助项目(15JDG166)
【分类号】：O324

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