靜動混壓頸軸承動態特性及穩定性之研究

Investigation of Dynamic Characteristics and Stability on Hybrid Journal Bearing

張永鵬(Yeon-Pun Chang)；林則均(Ze-Jun Lin)；胡聖彥(Sheng-Yen Hu)；康淵(Yuan Kang)

靜動混壓頸軸承 ； 動態特性 ； 穩定性 ； 空蝕效應 ； hybrid journal bearing ； dynamic characteristic ； stability ； cavitation

先進工程學刊

11卷3期（2016 / 07 / 01）

171 - 179

繁體中文

本文主要研究靜動混壓頸軸承使用毛細管節流器之動態特性，以及其所支撐的Jeffcott轉子─軸承系統之穩定性。考慮在空蝕效應下，其油腔軸向和周向節流長度比分別對於系統動態特性和穩定性之影響。假設初始軸承間隙內之油膜壓力呈線性分佈，使用微擾法將Reynolds方程式線性化，且建立其外部油壓系統經毛細管節流器流入軸承各油腔間流量守恆方程式，最後利用有限差分法聯立求解軸承動態特性，以及使用Routh-Hurwitz法來判別系統穩定性。經過數值分析結果得到系統慣性力門檻以及臨界漩振比影響之顯著性，油腔軸向節流長度比較油腔周向節流長度比顯著。

This article investigated the dynamic characteristics of capillary-compensated hybrid journal bearing and its stability of Jeffcott rotor-bearing system. Considering the cavitation effect, discussing the influence of oil recess axial restriction length ratio and circumferential restriction length ratio on dynamic characteristics and stability. Assume the initial film pressure within the bearing gap is linear distribution, using perturbation method to linearize the Reynolds equation. And establishing the flow conservation equations which are the external hydraulic system through capillary restrictors into each recess of bearing. Finally, solving the simultaneous equations to obtain dynamic characteristics of bearing by finite differential method, and determining the stability of system by using Routh-Hurwitz method. For the results of numerical analysis, getting the influence of the critical mass and critical whirl ratio of bearing system. The axial restriction length ratio is more significant than circumferential restriction length ratio.