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以某压气机燕尾形榫连结构为研究对象,基于ANSYS有限元软件,建立了盘片的有限元模型.用脉冲力模拟局部碰摩时的碰摩力,分析了两种碰摩情况对榫连结构接触特性的影响,首先分析了侵入量为定值时,不同转速对榫连结构接触特性的影响,接着分析了当转速为定值时,不同侵入量对榫连结构接触特性的影响.研究结果表明:随着转速的升高,榫连结构的最大接触压力和最大接触滑移距离不断的增加,最大接触压力变化规律变得更加复杂,而最大接触滑移距离变化规律逐渐趋于稳定并且最大接触滑移距离之间的变化幅度减小.随着侵入量的增加,榫连结构的最大接触压力以及最大接触滑移距离都会增大,但过大的侵入量将导致最大接触滑移距离发生突变.通过分析不同工况下几个节点接触压力及接触滑移距离的频谱响应,发现碰摩会产生转频的高倍频成分,当转频的倍频成分接近叶片固有频率时会出现倍频幅值放大现象.
Based on finite element software ANSYS, a finite element model of the disc was established with a dove-tenon joint structure of a compressor.The finite element model of the disc was established by using the finite element software ANSYS.The pulse force was used to simulate the rubbing force when the local rubbing was applied, Firstly, the influence of rotational speed on the contact characteristics of mortise-tenon connection was analyzed when the intrusion rate was constant. Then the influence of different intrusion rates on the contact characteristics of mortise-tenon connection was analyzed when the rotational speed was constant. The results show that with the increase of rotational speed, the maximum contact pressure and the maximum contact slip distance of mortise and tenon joints increase continuously, the variation law of maximum contact pressure becomes more complicated, and the variation rule of the maximum contact slip gradually stabilizes. The maximum contact pressure and the maximum contact slip distance of mortise and tenon joints increase with the increase of intrusion, but the excessive contact will lead to the maximum contact slip And the distance is changed.Through analyzing the spectrum response of contact pressure and contact slip distance of several nodes under different working conditions, it is found that the rubbing will produce the high frequency component of frequency conversion, There will be frequency amplitude amplification phenomenon points close to the natural frequency of the blade.