离心力场下电动振动台及动圈纠偏系统动特性的研究

Study of armature correction system of electrical vibration table with high-linear-acceleration

高线加速度下热与振动复合环境试验通常以离心机为主体 ,在机臂上安装温度箱、振动台实现复合环境 ,由于离心力的作用 ,振动台动圈无法产生振动 ,导致动圈烧坏 .针对这个问题 ,笔者首先利用刚体动力学方法 ,对离心力场作用下振动台进行建摸 ,分析动圈产生偏离的原因和离心力场对振动台固有特性的影响 ,提出气囊位移反馈动圈纠偏系统的设计方案 ,并对气囊动态特性进行分析 ,最后对振动台模型进行修正 .分析表明 ,当固定气囊一个气室的气压 ,气囊的刚度随离心机转速的升高而增大 ,系统幅频特性曲线右移 .

Centrifugal machines, vibration table, and temperature box are often used in the real thermal\|vibration combined environment with high\|linear\|acceleration. The armature cannot vibrate because of its deflected centrifugal force. In this study, the dynamics of rigid bodies method was used to establish a model for the electric vibration table system with high\|linear\|acceleration. Analysis of the dynamic character of the electric platform vibrator and the cause of the armature deflection with high\|linear\|acceleration led to the proposed design of the armature correction system presented in this paper. After the dynamic character of the armature correction system was studied, the dynamic model of the vibration table was finally corrected. According to the study, gas cell stiffness will increase with the speeding up of centrifugal machines and the graph of amplitude frequency response characteristics will move to the right when air pressure in one of the gas cells is fixed.