The rotary platform is the load-bearing substrate of a hydraulic excavator. The dynamic characteristics of the rotary platform directly affect the reliability and safety of the whole machine of a hydraulic excavator. In this work, the characteristics of the main external excitations acting on the hydraulic excavator such as the engine excitation, pressure pulsation excitation of the piston pump, inertial excitation of the working device, and road excitation are analyzed. The vibration transmission paths under the action of external excitations are ascertained. A vibration test method for the rotary platform of the hydraulic excavator is proposed. The vibration characteristics of the rotary platform under complex working conditions are researched, and the internal relationships between the vibration characteristics of the rotary platform and the engine excitation, pressure pulsation excitation of the piston pump, and road excitation are analyzed experimentally. The results show that the rotary platform is subjected to different excitations when it is under different working conditions. Moreover, the internal relationships between the dynamic characteristics of the rotary platform and the external excitation characteristics can be discovered by analyzing the vibration signals of the rotary platform, and the dynamic characteristics of the whole machine of the hydraulic excavator can be deeply studied based on the vibration characteristics of the rotary platform.

中文翻译：

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复杂工况下液压挖掘机回转平台振动特性分析与试验研究

回转平台是液压挖掘机的承载基板。回转平台的动态特性直接影响液压挖掘机整机的可靠性和安全性。本文分析了作用于液压挖掘机的主要外部激励的特性，如发动机激励、柱塞泵压力脉动激励、工作装置惯性激励、路面激励等。确定了外部激励作用下的振动传递路径。提出了一种液压挖掘机回转平台振动试验方法。研究了复杂工况下旋转平台的振动特性，并通过实验分析了旋转平台的振动特性与发动机激励、活塞泵压力脉动激励、路面激励之间的内在关系。结果表明，旋转平台在不同的工况下受到不同的激励。此外，通过分析回转平台的振动信号，可以发现回转平台的动态特性与外部激励特性之间的内在关系，并在此基础上深入研究液压挖掘机整机的动态特性。旋转平台的振动特性。结果表明，旋转平台在不同的工况下受到不同的激励。此外，通过分析回转平台的振动信号，可以发现回转平台的动态特性与外部激励特性之间的内在关系，并在此基础上深入研究液压挖掘机整机的动态特性。旋转平台的振动特性。结果表明，旋转平台在不同的工况下受到不同的激励。此外，通过分析回转平台的振动信号，可以发现回转平台的动态特性与外部激励特性之间的内在关系，并在此基础上深入研究液压挖掘机整机的动态特性。旋转平台的振动特性。