CAJ | 학술논문

针对高速电主轴轴向振动直接影响立式加工件品质高低问题，用有限元法建立高速电主轴转子轴承动力学模型，分析系统固有特性。轴向一阶固有振型为转子刚体振动振形，固有频率远低于一阶径向振动，理论计算固有频率结果与实验结果误差较小；据线性二次型最优控制理论对高速电主轴轴向振动的主动抑制进行理论分析，设计输出反馈控制系统，建立闭环动力学模型。实例计算结果表明，闭环系统能有效抑制高速电主轴轴向振动。
침대고속전주축축향진동직접영향입식가공건품질고저문제，용유한원법건립고속전주축전자축승동역학모형，분석계통고유특성。축향일계고유진형위전자강체진동진형，고유빈솔원저우일계경향진동，이론계산고유빈솔결과여실험결과오차교소；거선성이차형최우공제이론대고속전주축축향진동적주동억제진행이론분석，설계수출반궤공제계통，건립폐배동역학모형。실례계산결과표명，폐배계통능유효억제고속전주축축향진동。
The processing quality of vertical machining workpieces is affected by the rotor's axial vibration of high-speed motorized spindles.A dynamic finite element model was built to discuss the dynamic behaviors of high-speed motorized spindles.It is found that the axial rigid vibration is the first natural mode of vibration and the first natural frequency of axial vibration is lower than that of radial vibration.The good agreement between the theoretical results and the experimental data indicates that the model can describe appropriately the dynamic characteristics of the axial vibration. Finally,the active axial vibration suppression theory of high-speed motorized spindles was given out based on the linear quadratic optimal control theory.The simulation results show that the axial vibration amplitude of the closed-loop system will be attenuated more quickly than the open-loop system.