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局域波法通过局域波分解和瞬时频率的求解,将任何复杂的信号分解成为有限数目并且具有一定物理意义的基本模式分量,每一个分量描述了时变信号中不同频率和尺度范围的固有振动模式,所获得的各分量局域波时频分布具有多分辨分析特征.由于局域波分解是自适应的,它的多分辨分析特征也是自适应的.经理论分析与对变速箱轴承座处拾取的振动信号的分析验证了方法的有效性,局域波法为工程测试中的时频分析提供了一种有效的手段.
The local wave method decomposes any complex signal into a finite number of basic mode components with a certain physical meaning through the solution of local wave decomposition and instantaneous frequency. Each component describes the inherent modes of different frequency and scale ranges in a time-varying signal Vibration mode, the obtained local time-frequency distribution of each component has multiresolution analysis features.As the local wave decomposition is adaptive, its multi-resolution analysis features are adaptive.Study on the theoretical analysis of the gearbox housing The analysis of vibration signal picked up at the test verifies the validity of the method. The local wave method provides an effective method for time-frequency analysis in engineering testing.