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针对混凝土泵车输送管内周期性压力脉动载荷与末端摩擦脉动载荷造成泵车臂架系统振动的问题,采用刚柔耦合建模理论对某型号泵车包括臂架、液压油缸、支承连杆及输送管等部件在内的臂架系统创建虚拟样机模型并进行动力学仿真分析,分析分配回路延迟响应时间对泵车臂架系统振动的影响,并对泵车整车实物做振动测试。测试和仿真结果表明:输送管内压力脉动载荷与末端摩擦脉动载荷的联合作用造成臂架系统振动,其激励频率达到泵车臂架系统固有频率时引起臂架系统共振;缩短分配回路的延迟响应时间能够有效降低臂架系统振动的振幅。
Aiming at the problem of vibration of pump arm boom system caused by periodic pressure pulsation load in the pipe of concrete pump truck and end friction pulsation load, a model of pump truck including boom, hydraulic cylinder, support connecting rod and conveying Tube and other components of the boom system to create a virtual prototype model and dynamics simulation analysis of the distribution loop delay response time on the vibration of the pump arm system and vibration of the whole vehicle to do the vibration test. The results of the test and the simulation show that the joint action of pressure pulsating load and frictional pulsation at the end of the pipeline causes the boom system to vibrate. When the excitation frequency reaches the natural frequency of the pump boom system, it causes the boom system to resonate. The delay response time of the distribution loop is shortened Can effectively reduce the vibration amplitude of the boom system.