基于周期性激励的采煤机机电液截割传动系统特性分析

摘要

According to structural characteristics of electro-mechanical-hydraulic cutting transmission system of a coal cutter,an electro-mechanical-hydraulic coupled model was built for the transmission system including gears and pumps with flow fluctuation of piston pumps as the system' s external excitation and time-varying meshing stiffness of gear pairs as the system' s internal excitation.Then dynamic characteristics of the transmission system were analyzed under the external excitation and internal one.The results showed that the flow fluctuation of pumps affects vibrational and dynamic characteristics of the transmission system;as external excitation,the flow fluctuation is the main factor affecting the system' s dynamic characteristics;after considering the flow fluctuation,the motor output reveals torque fluctuation,the total efficiency of the cutting transmission system drops.%根据采煤机机电液截割传动系统的结构特点,考虑柱塞泵的流量脉动和齿轮传动系统的时变刚度,建立了包括泵和齿轮在内的传动系统机电液耦合模型.以流量脉动作为齿轮传动系统外部激励,以时变啮合刚度作为齿轮传动系统内部激励,基于内外部激励对采煤机机电液截割传动系统进行特性分析.结果表明:泵流量脉动对齿轮系统振动与动力学特性都有影响,且流量脉动作为外部激励是影响齿轮系统动力学特性的主要因素;考虑泵流量脉动后,马达输出呈现转矩脉动,截割传动系统总效率下降.