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

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 120 000 r/min，the test bearing temperature was lower than 130 ℃，and the vibration acceleration was lower than 3.0g.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 120 000 r/min，the starting time only needs $\mathrm{60}\mathrm{s}$，and the stopping time only needs 40 s，and the bearing can complete more than 3 000 continuous frequent start-stop.