端面密封动态性能模型的多维求解复杂性限制了对密封的实时动态监测,为此建立了基于本征正交分解(POD)方法的密封性能求解降阶模型,以获取实时的密封性能特征参数,包括非接触密封微小间隙产生的液膜轴向力及沿着不同方向的液膜力矩.基于降解模型提出了非接触端面密封动态监测的原理,并分析了不同液膜振动频率下的降阶模型的计算误差,完成了对一组不同密封间隙及液膜振动频率下的水润滑端面液膜轴向力及力矩的数值仿真.研究结果表明提出的基于POD降阶模型的非接触端面密封动态监测能达到较高的分析精度,这对于非接触端面密封的动态控制及研究瞬态启动过程中的密封动静特性具有重要的作用.
To solve the complex multi-dimensional problem arising in the process of obtaining the real-time performance of a non-contact face seal, a reduced order model based on proper orthogonal decomposition (POD) is proposed. With the model, the dynamic seal performance parameters are computed, including the liquid film force generated by the sealing micro-gap and different directional moments induced by the liquid film. With the POD reduced order model, the principle for the real-time monitoring of the non-contact face seal performance is presented, and the calculation error for different vibration frequencies of axial positions are analyzed. With the principle, a numerical simulation of a water-lubricated non-contacting face seal with different seal gaps and liquid vibration frequencies is implemented, and the liquid film force, torque and their calculation errors are obtained. The results show the high accuracy of the non-contact seal dynamic monitor based on the proposed POD reduced-order model, which will help to promote the level in researching the dynamic control of non-contacting face seals and the static and dynamic performances of seals during the transient start-up stage.
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