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环境激励下基于chirplet变换的线性时变系统参数识别

张杰 史治宇 李利荣

张杰, 史治宇, 李利荣. 环境激励下基于chirplet变换的线性时变系统参数识别[J]. 航空动力学报, 2020, 35(1): 9-17. doi: 10.13224/j.cnki.jasp.2020.01.002
引用本文: 张杰, 史治宇, 李利荣. 环境激励下基于chirplet变换的线性时变系统参数识别[J]. 航空动力学报, 2020, 35(1): 9-17. doi: 10.13224/j.cnki.jasp.2020.01.002
ZHANG Jie, SHI Zhiyu, LI Lirong. Parameter identification of linear time-varying systems based on chirplet transform under environmental excitation[J]. Journal of Aerospace Power, 2020, 35(1): 9-17. doi: 10.13224/j.cnki.jasp.2020.01.002
Citation: ZHANG Jie, SHI Zhiyu, LI Lirong. Parameter identification of linear time-varying systems based on chirplet transform under environmental excitation[J]. Journal of Aerospace Power, 2020, 35(1): 9-17. doi: 10.13224/j.cnki.jasp.2020.01.002

环境激励下基于chirplet变换的线性时变系统参数识别

doi: 10.13224/j.cnki.jasp.2020.01.002
基金项目: 国家自然科学基金(11172131,11232007);江苏高校优势学科建设工程

Parameter identification of linear time-varying systems based on chirplet transform under environmental excitation

  • 摘要: 提出了针对时变系统响应的短时频率线性时变假设,通过将时变响应拟合成多分量线调频信号,根据线调频信号互相关理论推导了随机白噪声激励下时变系统的物理参数识别方法。该识别方法只需基于结构的加速度响应,便能识别结构的时变质量和刚度。由于引入了调频斜率刻画响应信号的短时频率线变特征,该方法相比传统识别方法能更好地追踪快变甚至突变参数,对实际工程中的时变问题具有重要的应用价值。仿真算例中构造了1个3自由度时变结构模型,针对线性时变、周期时变和突变等情况进行了物理参数的识别,误差分析显示识别误差均在5%以内,仿真结果验证了方法的正确性和适用性。

     

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出版历程
  • 收稿日期:  2019-07-30
  • 刊出日期:  2020-01-28

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