快速Myriad滤波方法的混凝土坝动力响应信号去噪研究

Research of Signal Denoising in Dynamic Response of Concrete Dam Based on Fast Myriad Filter Method

环境激励下混凝土坝动力响应信号具有明显的非线性特征,常规的信号去噪方法不能适用于非线性信号的去噪.本文研究了快速Myriad滤波方法对环境激励下混凝土坝动力响应信号的去噪,讨论了一种对Myriad滤波器中线性度参数进行优选的新方法.仿真信号的去噪测试分析验证了本文对线性度参数优选方法的合理性.本文最后将快速Myriad滤波方法应用于对振动台上采集到的混凝土坝动力响应模拟信号的去噪处理,取得了较好的去噪效果.

The dynamic response signal of concrete dam under environment excitation has obvious nonlinear characteristics; conventional methods used in signal denoising can not be applied to the denoising of nonlinear signals. In this paper, the method of fast Myriad filter is researched for denoising the dynamic response of concrete dam under environment excitation; and a new approach to optimizing the linearity parameter of the Myriad filter is discussed. The tests and analysis of the simulation signals verify that this approach is reasona- ble and suitable for the optimization of the linearity parameter. Finally, the method of fast Myriad filter has been applied to denoising the dynamic response analog signal of concrete dam which collected from the shaking table; and the denoising effectiveness is satisfactory.