A new dynamic model is developed for the dual clearance squeeze film damper (DCSFD) considering the effect of cavitation in this paper. The relationship between the eccentricities of the inner and outer films is achieved based on the equations of motion. The Reynolds equation and Rayleigh–Plesset equation are employed to describe the kinetic properties of DCSFD and the cavitation effect of film, respectively. Under the assumption of compressible fluid, the pressure distribution of DCSFD is finally obtained by the numerically iterative method. The film pressure distribution in the outer layer (including the positive and negative pressure zones) obtained from the experimental test agrees well with the numerical prediction, which verifies the validity of the proposed numerical model. In Section 5, the effects of oil temperature, inlet pressure, eccentricity, and whirling frequency on the cavitation in the film are investigated systematically and experimentally. The experimental results indicate that cavitation mainly affect the pressure in the negative pressure zone of the inner and outer film of DCSFD, but has little influence on the pressure in the positive pressure zone. The area of cavitation increased with eccentricity; when the inner eccentricity reached 0.1 or above, the area near the injection hole of film also generated a small zone of negative pressure. The numerical model and the experimental results in this paper are valuable for further research and engineering applications of DCSFD.

中文翻译：

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空化对双间隙挤压膜阻尼器影响的数值与实验研究

本文开发了一种考虑空化效应的双间隙挤压油膜阻尼器 (DCFD) 的新动力学模型。内膜和外膜的偏心率之间的关系是基于运动方程实现的。Reynolds方程和Rayleigh-Plesset方程分别用于描述DCFD的动力学特性和薄膜的空化效应。在可压缩流体假设下，通过数值迭代的方法最终得到了DCFD的压力分布。实验得到的外层（包括正负压区）油膜压力分布与数值预测吻合较好，验证了所提出数值模型的有效性。在第 5 节中，油温、进口压力、系统和实验研究了薄膜中空化的偏心率和旋转频率。实验结果表明，空化作用主要影响DCFD内外膜负压区的压力，对正压区的压力影响不大。空化面积随着离心率的增加而增加；当内偏心达到0.1或以上时，薄膜注入孔附近的区域也产生了一个小的负压区。本文的数值模型和实验结果对DCFD的进一步研究和工程应用具有重要价值。实验结果表明，空化作用主要影响DCFD内外膜负压区的压力，对正压区的压力影响不大。空化面积随着离心率的增加而增加；当内偏心达到0.1或以上时，薄膜注入孔附近的区域也产生了一个小的负压区。本文的数值模型和实验结果对DCFD的进一步研究和工程应用具有重要价值。实验结果表明，空化作用主要影响DCFD内外膜负压区的压力，对正压区的压力影响不大。空化面积随着离心率的增加而增加；当内偏心达到0.1或以上时，薄膜注入孔附近的区域也产生了一个小的负压区。本文的数值模型和实验结果对DCFD的进一步研究和工程应用具有重要价值。靠近薄膜注入孔的区域也产生了一个小的负压区。本文的数值模型和实验结果对DCFD的进一步研究和工程应用具有重要价值。靠近薄膜注入孔的区域也产生了一个小的负压区。本文的数值模型和实验结果对DCFD的进一步研究和工程应用具有重要价值。