CAJ | 학술논문

针对含水润滑橡胶轴承轴系在摩擦激励与弯扭耦合作用下产生自激振动并诱发异常噪声、而常用的点支承模型无法用于分析轴承分布支承力及轴承倾斜等因素对轴系振动影响，采用分布式轴承支承模型及速度依赖型Stri-beck摩擦模型，利用拉格朗日方程及模态展开法建立摩擦激励下轴系动力学模型。用数值仿真研究轴系非线性振动与系统物理参数间关系，探讨接触力、转速、轴承倾斜等因素对轴系响应特性影响。结果表明，在相同摩擦系数、接触力、转速条件下轴承倾斜会使轴系更易产生自激失稳。
침대함수윤활상효축승축계재마찰격려여만뉴우합작용하산생자격진동병유발이상조성、이상용적점지승모형무법용우분석축승분포지승력급축승경사등인소대축계진동영향，채용분포식축승지승모형급속도의뢰형Stri-beck마찰모형，이용랍격랑일방정급모태전개법건립마찰격려하축계동역학모형。용수치방진연구축계비선성진동여계통물리삼수간관계，탐토접촉력、전속、축승경사등인소대축계향응특성영향。결과표명，재상동마찰계수、접촉력、전속조건하축승경사회사축계경역산생자격실은。
The coupling between nonlinear friction and bending-torsion vibration can induce self-excited vibration of shaft system with water-lubricated rubber bearing,and result in abnormal noise.Current researches are mainly based on the dynamic model with single-point bearing and cannot analyze the influence of distributed bearing force and bearing inclination on the vibration characteristics of shaft system.In order to solve this problem,a dynamic model of shaft system was developed based on distributed bearing model and velocity dependent friction represented by Stribeck curve.The equation of motion was derived using Lagrangian approach and modal synthesis method.Using numerical method,the relationship between the nonlinear dynamic response and the system’s physical parameters was analyzed.The effects of contact force,rotational speed and inclination of bearing were also discussed.According to the simulation results,the self-excited vibration of shaft system with inclined bearings can be more easily observed under the same conditions of contact force,rotational speed and friction parameters as in the case of poind bearing model.