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为了提高引射式压力恢复系统振动抑制性能,减小本系统振动对其他系统的影响,分析了系统的振动特性和振型,建立了系统振动力和主振型数学模型,利用时域信号取均方根方法测试了系统3个支座动态振动力,振动力沿气流方向逐渐减小。采用被动控制振动抑制技术,根据振动力设计制作了减振器,研究了橡胶块与金属弹簧并联再加配重以及橡胶块加配重2种减振器模型的减振效果。结果表明:橡胶块与金属弹簧并联、加配重45.2kg的减振器模型减振效果好,当控制点输入加速度为5 g时,减振效果最佳。激励强度大小、弹簧刚度和阻尼等参数的优化能够提高减振器的减振性能。
In order to improve the vibration suppression performance of the induced pressure recovery system and reduce the influence of the system vibration on other systems, the vibration characteristics and mode shapes of the system are analyzed, and the mathematical model of the system vibration force and the main vibration mode is established. The root mean square method is used to test the dynamic vibration force of three bearings of the system, and the vibration force decreases along the direction of airflow. The passive vibration control technology was used to design and manufacture the shock absorbers according to the vibration force. The vibration reduction effect of the two shock absorber models with rubber block and metal spring added in parallel with rubber block and metal spring was studied. The results show that the rubber block is parallel with the metal spring, and the shock absorber model with the weight of 45.2kg has good damping effect. When the input acceleration of the control point is 5g, the damping effect is the best. The optimization of parameters such as excitation intensity, spring stiffness and damping can improve the vibration damping performance of shock absorber.