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本文用ITD法对2.5t·m液压锤进行了实验模态分析,识别出了液压锤的二自由度阻尼振动的力学模型。基于这一模型,用状态空间法求出了液压锤基础振动的位移、速度、加速度以及液压锤锤身微升所用的拉杆所受的动态力。根据上述计算结果给出了液压锤隔振垫层的合理刚度系数,并制成橡胶隔振器应用于实际生产中。现场实测结果表明,安装新的隔振器后,锤基础的振动加速度比原来减少44％。
In this paper, an experimental modal analysis of a 2.5t · m hydraulic hammer is carried out by using the ITD method, and a mechanical model of two degrees of freedom damped vibration of the hydraulic hammer is identified. Based on this model, the displacement, velocity, acceleration and the dynamic force of the tie rod used for lifting the hammer of the hydraulic hammer are calculated by the state space method. Based on the above calculation results, the reasonable stiffness coefficient of the hydraulic hammer vibration isolating cushion is given and the rubber vibration isolator is made into the actual production. The field test results show that after the installation of a new vibration isolator, the vibration acceleration of the hammer base is reduced by 44% compared with the original.