基于OTPA方法的挖掘机驾驶室结构噪声源识别

工况下传递路径分析方法(OTPA)是在传统TPA方法的基础上改进而来的。目前OTPA方法已经广泛应用于工程机械领域振动信号之间的传递特性分析中,而在振动和噪声信号之间的应用较少。应用OTPA方法,以发动机振动为主要激励源进行分析,研究某型液压挖掘机的驾驶室耳旁结构噪声,并采用奇异值分解技术对输入信号进行处理。通过对比合成信号和实测信号,验证OTPA方法的有效性。通过各路径的噪声贡献分析,对降噪措施提出建议。

Structure-borne Noise Source Identification of an Excavator’s Cab based on Operational Transfer Path Analysis

Operational transfer path analysis (OTPA) is an improvement of the traditional transfer path analysis method. So far OTPA has been widely applied in engineering machinery to analysis the transmission between vibration signals, while the application between vibration signals and noise signals is still relatively few. In order to analysis the structure-borne noise of an excavator cab, OTPA is applied with the engine vibration as the major vibration source. In addition, the singular value decomposition technique (SVD) is applied to process the input signal. The validity of the OTPA method is verified by comparing the synthetic output signal with the measured output signal. By means of the path noise contribution analysis, some noise reduction measures are proposed.