非高斯随机振动试验并行控制策略研究  

Concurrent Control Strategy Research for Non-Gaussian Random Vibration Test

作　　者：陈家焱[1] 陈章位[2] 贺惠农[3] 周建川 

机构地区：[1]中国计量学院质量与安全工程学院,杭州310018 [2]浙江大学流体动力与机电系统国家重点实验室,杭州310027 [3]浙江大学生物医学工程与仪器科学学院,杭州310027 [4]杭州亿恒科技有限公司,杭州310003

出　　处：《机械工程学报》2012年第4期193-198,共6页Journal of Mechanical Engineering

摘　　要：针对非高斯随机振动试验控制中功率谱均衡与峭度均衡相互干涉,影响控制精度的问题,提出非高斯随机振动试验并行控制策略。在提出整个系统控制流程的基础上,分别给出功率谱均衡控制算法和峭度均衡控制算法。对蕴含峭度信息的随机信号产生机理展开研究,先给出信号产生的流程图,然后推导出符合控制系统要求的随机信号设计参数。利用功率谱设计滤波器,通过卷积运算调制出用于系统控制的驱动信号。仿真与试验结果表明,采用非高斯随机振动试验并行控制策略进行系统控制,其输出响应谱与参考谱的误差完全满足工程中常用的±3 dB控制要求,峭度控制也达到很高的精度,满足工程试验要求,从而验证该控制策略的有效性。Concurrent control strategy research for non-Gaussian random vibration test is proposed in order to solve the mutual interference between power spectrum and Kurtosis equilibrium in non-Gaussian random vibration test control,which affects the control accuracy.Both power spectrum equilibrium control algorithm and Kurtosis equilibrium control algorithm are presented based on the given control flow chart for whole system.The generation principle of random signal contained Kurtosis information is investigated,the flow chart for signal generation is given,subsequently,design parameters for random signal conforming to the control system is inferred.The filter is designed by using power spectrum and drive signal applied for control system is also modulated through convolution operation.The simulation and experiment based on concurrent control strategy for non-Gaussian random vibration tests indicate that the error between output response spectrum and reference spectrum satisfies the engineering requirement of ±3 dB,and kurtosis also conforms to demands in practice with high control accuracy,thus proving the validity of this control strategy.

关 键 词：随机振动试验 非高斯 峭度 散弹噪声 并行控制 

分 类 号：O324[理学—一般力学与力学基础]