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Wang Y.,Xian Shiyou University | Zhang L.,AVIC Shaanxi Aerospace Electrical Co. | Tang N.,Xian Shiyou University | Huo A.,Xian Shiyou University | Cheng W.,Xian Shiyou University
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering

It is not an easy job to control a cylindrical and rotatable servo platform at a special angle for a push-the-bit rotary steerable drilling system while it is acted by complex applied torque. A nonlinear dynamic model is established which considers such complex torque as friction, hydraulic shock, quality distribution eccentricity, installation error eccentricity and turbine motor electromagnetic torque, etc. The regular pattern of rotational movement about this platform is obtained under no torque and complex applied torque based on simulation of this model, which relates to platform structure and torque parameters. A hydraulic driving torque test is carried out, which indicates that dynamics analysis is reasonable. Some improvement suggestions of structure design are presented. Source

Cheng Z.,AVIC Shaanxi Aerospace Electrical Co. | Wang F.,AVIC Shaanxi Aerospace Electrical Co. | Zhang X.,AVIC Shaanxi Aerospace Electrical Co.
Jinshu Rechuli/Heat Treatment of Metals

The main generator rotor end ring of a motor made by 1Cr18Ni9Ti steel fractured in the acceptance test. The fracture morphology, microstructure, fracture morphology of SEM and energy spectrum of the failure end ring were analyzed by means of scanning electron microscope and optical microscope. Validation analysis was carried out with simulated experiment. The results show that the fracture is intergranular fracture caused by high temperature and friction generated by the high-speed rotation between the end ring and stator of the motor. The cause lead to end ring failure is that the positioning gap between the end ring and the stator is not guaranteed in the assembly process. Source

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