一种改进掩膜信号法及其在车桥振动响应信号中的应用

摘要

针对经验模态分解法中存在的模态混叠问题，在掩膜信号法研究的基础上，通过编制掩膜信号幅值与频率确定程序，提出了一种改进掩膜信号法，并通过两个仿真实例进行了验证。其在车桥振动响应信号中的应用结果表明：在没有噪声处理的情况下，该方法可以大致得到信号中非平稳的基频响应信号组份，并且该组份具有定位间断事件的能力，这为车桥振动响应信号的处理提供了一个新的研究途径。%For the mode mixing issue of the empirical mode decomposition (EMD) method, an improved masking signal method was proposed by programming the amplitude and frequency determination of the masking signal. This method was validated by two simulation experiments. Application of this method to the analysis of vehicle-bridge vibration response signal shows that the unsteady fundamental frequency response signal component can be obtained approximately without noise processing by using this method, and the component has the ability of positioning intermittent events. This method may provide a new research approach for signal processing of the vehicle-bridge vibration response.