The effect of orientation of rotors and rotating unbalance at disc on the dynamic response of rotor supported by four pad tilting pad journal bearing (TPJB) is studied. The orientation of the rotor taken has a horizontal rotor (HR) and a vertical rotor (VR). The rotor element modeled as the Timoshenko beam element with four degrees of freedom per node. The disc is rigid and it is centrally mounted. The nonlinear forces by the fluid film in tilting pad journal bearing were determined by solving the Reynolds equation along with each pad. The infinite short bearing assumption has taken to find pressure distribution along with pads. Indigenous MATLAB code has developed to solve the rotor-TPJB equation. The ODE-15s solver is used to find the related response data of journal and disc centers. Orbits, phase plots, and power spectrums used to analyze the behavior of the system. The sub-synchronous vibrations dominate at lower speeds and high rpm unbalance forces become much significant and overcome bearing fluid film forces causing catastrophically change in response of the system.

研究了转子方向和圆盘旋转不平衡对四瓦可倾瓦轴颈轴承（TPJB）支撑的转子动态响应的影响。所取转子的方向有一个水平转子（HR）和一个垂直转子（VR）。转子单元建模为 Timoshenko 梁单元，每个节点具有四个自由度。圆盘是刚性的，并安装在中央。可倾瓦轴颈轴承中流体膜的非线性力是通过求解雷诺方程以及每个瓦来确定的。无限短轴承假设已用于找到与轴瓦一起的压力分布。土著 MATLAB已开发代码来求解转子-TPJB 方程。ODE-15s求解器用于查找日志和磁盘中心的相关响应数据。用于分析系统行为的轨道、相位图和功率谱。次同步振动在低速和高转速下占主导地位，不平衡力变得非常重要，克服了轴承液膜力，导致系统响应发生灾难性变化。