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The Modal Analysis of the Ceramic Ball Rolling Contact Fatigue Life Test Rig Drive Shaft Abstract: With the increasing of the rolling contact fatigue life tester’s speed, the vibration problem is getting more and more serious. In order to optimize the dynamic performance test rig, the modal analysis of the drive shaft was carried. First the vibration mechanics model was got by simplifying the shaft and get the first order of horizontal natural frequency which is 787.4266Hz with the theoretic algorithm. Then the drive shaft’s modal analysis was made by using the finite element software and that is 779Hz. The relative error between the former and the latter is 1.1%. It has demonstrated the accuracy of the finite element result, and its modal analysis could be the basis of the dynamic optimization.

The RCF life of bearing balls is a main method to evaluate the performance of bearing materials and their production technology. In general, the RCF life of ceramic balls is a reliable technique to asses whether or not they are suitable to be used in rolling bearings. The rolling contact fatigue test has practical characteristic. The long time, noise heavy make the tester tired. The fault occurring, the chain reaction is generated. The test rig destruction is strong unless quick treatment. The characteristic frequency of test rig rotating member is calculated. The fault is diagnosed by characteristic frequency. The test indicated that the fault diagnosis accurate, effective and feasible.

It is presented to apply the designing methodology in design of an accelerated pure rolling contact fatigue test rig for ceramic bearing ball. Starting with function analysis, the request and structure of test rig are analysed. Meanwhile, the form matrix table is established, from which many designing schemes can be obtained. In accordance with several kinds of innovation schemes, the appraised decision of product is analyzed. The specimen machine is made according to the design scheme in the design of innovation.