高速频繁起停球轴承设计与试验

Design and test for ball bearings under high-speed and frequent start-stop

为解决涡轮起动机用轴承在高速、频繁起停工况下易失效的问题,结合轴承设计准则,进行涡轮起动机用轴承结构参数设计和材料选取。基于轴承动力学理论,建立了动力学模型并进行了仿真分析,研究高速、频繁起停工况下的轴承动力学行为。在自主研发的试验机上进行轴承试验,试验过程中监测轴承温升及振动加速度值,轴承频繁起停、最高转速达12000 r/min时,试验轴承温度低于130℃,振动加速度低于3.0g,试验后轴承无异常,验证了轴承设计和材料选取合理。通过优化设计和试验验证结果表明:轴承转速可达12000r/min,起动时间仅需60 s,停止时间仅需40 s,轴承能够完成连续频繁起停3000次以上。

To solve the bearings failure of turbine starters under the conditions of high-speed and frequent start-stop,the structure parameters design and material selection for turbine starters were carried out in combination with the design criteria of bearings.Based on the dynamics theory of bearings,the dynamic model was established and simulated.The dynamic behaviour for bearings of high speed,frequent start-stop conditions was investigated.The bearing test was carried out on the self-developed testing machine.During the test,the bearing temperature rose and vibration acceleration value were monitored.In case of bearing frequent start-stop and the maximum speed reaching 120000 r/min,the test bearing temperature was lower than 130℃,and the vibration acceleration was lower than 3.0 g.After test,the bearing was not abnormal,verifying that the bearing design and material selection were reasonable.Through optimized design and test verification,the bearing speed could be raised to 120000 r/min,the starting time only needs60 s,and the stopping time only needs 40 s,and the bearing can complete more than 3000 continuous frequent start-stop.