振动台正弦振动虚拟仿真技术研究  

Research on Virtual Simulation Technology of Sine Vibration of Shaking Table

作　　者：饶玉文 牛金皓 RAO Yu-wen;NIU Jin-hao(Nanjing Chenguang Group Co.,Ltd,Nanjing 210000)

机构地区：[1]南京晨光集团有限责任公司,南京210000

出　　处：《环境技术》2023年第1期136-140,共5页Environmental Technology

摘　　要：本文以8t电动振动台为研究对象,根据动圈实物建立动圈结构实体模型,并对动圈进行模态试验,基于模态测试数据对动圈模型进行简化优化,调整修正动圈各结构的弹性模量与密度参数,使得模型有限元仿真得到的前五阶固有频率与模态试验结果的误差均在10%以内,振型变化一致。同时仿真与试验的一阶轴向固有频率较为接近,建立的动圈有限元模型能够反映出振动台的动态特性。在线性假设条件下,由给定的2g加速度正弦振动试验条件反推出施加在动圈驱动线圈上的激振力谱,以此激振力谱作为仿真控制条件,采用ANSYS软件对有限元模型进行仿真计算,结果表明,仿真结果与试验验证结果较为吻合,建立的模型能够准确地反映出动圈的固有特性,可用于指导振动台正弦振动虚拟仿真。In this paper,the 8-ton electrodynamic vibration shaker is taken as the research object,and the armature structure entity model is established according to the real object of the armature,and the modal test is carried out on the armature.The armature model is simplified and optimized based on the modal test data,and the elastic modulus and density parameters of each structure of the armature are adjusted and modified,so that the error between the first five natural frequencies obtained by the model finite element simulation and the modal test results is within 10%,and the vibration mode changes are consistent.At the same time,the first-order axial natural frequency of the simulation is close to that of the test,and the finite element model of the dynamic coil can reflect the dynamic characteristics of the shaking table.Under the linear hypothesis,the excitation force spectrum applied to the armature of the armature is deduced from the given 2 g acceleration sine vibration test condition,and the excitation force spectrum is used as the simulation control condition.The finite element model is simulated and calculated by ANSYS software.The results show that the simulation results are in good agreement with the test verification results,and the established model can accurately reflect the inherent characteristics of the armature,It can be used to guide the virtual simulation of sinusoidal vibration of shaking table.

关 键 词：虚拟仿真 电动振动台 动圈 模态试验 模型修正 有限元 

分 类 号：TB123[理学—工程力学] V416.2[理学—力学]