弹性轴磨削颤振检测与颗粒阻尼减振研究

Research on Chatter Detection and Particle Damping of Elastic Shaft Face Grinding

由于航空用弹性传动轴法兰与轴之间以膜片连接,在精密磨削法兰端面时会发生严重颤振,造成磨削效率低、质量不宜控制。为此,采用激光位移传感器测量磨削过程中弹性传动轴端面的振动位移数据,根据获得的端面振动时域和频域特征,针对性地设计一种颗粒阻尼器,并开展了结构参数优化研究。首先,根据工件结构和磨削工艺确定了阻尼器的安装形式与外形尺寸;然后,通过离散元仿真对比研究了不同内部参数的性能,确定了最优颗粒填充方案。最后,通过电磁激振器试验验证了设计制造的颗粒阻尼器的抑振效果。

The flange of elastic transmission shaft is connected with the shaft by diaphragm,serious chatter will occur in precision grinding of flange end face,resulting in low grinding efficiency and poor quality control.Therefore,a laser displacement sensor is used to measure the vibration displacement data of elastic transmission shaft end face in grinding process.According to the time domain and frequency domain characteristics of end face vibration,a particle damper is designed and the optimization of structural parameters is carried out.Firstly,according to the workpiece structure and grinding process,the installation form and external dimensions of the damper are determined.Then,the performances of different internal parameters are compared by discrete element simulation,and the optimal particle filling scheme is determined.Finally,the vibration suppression effect of the designed particle damper is verified by the experiment of electromagnetic vibration exciter.