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电动负载模拟器摩擦模型参数辨识方法
引用本文:李成成,王广林,潘旭东,李跃峰.电动负载模拟器摩擦模型参数辨识方法[J].振动.测试与诊断,2020,40(2):519-525.
作者姓名:李成成  王广林  潘旭东  李跃峰
作者单位:(西南交通大学土木工程学院 成都,610031)
基金项目:(国家自然科学基金资助项目(11627802,51478071)
摘    要:随机子空间算法作为模态参数识别算法中的主要方法之一,虽然被广泛运用于实际桥梁结构的模态参数识别中,但其依然存在一定的缺陷。基于此,针对其存在的三大问题:系统定阶难、只适用于时不变结构以及真实模态筛选存在主观性,笔者提出了相应的解决方法。首先,利用“奇异熵增量一阶导数法”实现系统阶次的智能化判定;其次,引入“滑窗技术”对输入信号进行划窗处理,实现时变结构的参数识别;然后,基于真实模态存在的一般规律,并通过建立相似矩阵实现真实模态的辨识;最后,将信号采集、信号预处理和改进随机子空间算法进行有效结合,运用于某大型斜拉桥振动台试验以验证所提算法的可靠性。结果表明:所提算法能运用于桥梁的健康监测中,且识别结果具有可信性。

关 键 词:桥梁工程  随机子空间算法  模态参数  系统阶次  模态识别

Research on Parameter Identification Method of Friction Model for Electric Load Simulator
LI Chengcheng,WANG Guanglin,PAN Xudong,LI Yuefeng.Research on Parameter Identification Method of Friction Model for Electric Load Simulator[J].Journal of Vibration,Measurement & Diagnosis,2020,40(2):519-525.
Authors:LI Chengcheng  WANG Guanglin  PAN Xudong  LI Yuefeng
Abstract:Stochastic subspace algorithm is widely used in bridge structure modal parameter identification. However, there remains problems like: difficulty to determine the order of a system, limitedapplication on time-invariant structures, and the subjectivity in real modal selection. In light of these problems, an improved algorithm is proposed. First, the order of the system is decided intelligently by singular entropy increment first order derivative method. Then, the parameters of the time-varying structure are identified by processing the input signal with sliding window technique. Furthermore, the real modes are identified from a similarity matrix generated based on the general rules. Finally, the signal acquisition, signal preprocessing and the improved stochastic subspace algorithm are combined, and the comprehensive method is applied to the shaking table test of a large cable-stayed bridge to verify the reliability of the proposed algorithm. The results show that the proposed algorithm can be used in bridge health monitoring, and the recognition results are credible.
Keywords:bridge engineering  stochastic subspace algorithm  modal parameter  system order  modal identification
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