Jiajin Wang

Lifespan Evaluation and Reliability-oriented Design of Deep-sea Motor Considering Cyclic Thermo-mechanical Stress

Jian Zhang, Zhenbo Yan, Yi Zhou, Jiajin Wang et autres

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Optimal inspection-based maintenance strategy for k -out-of- n : G load-sharing systems consisting of three-state components

Jiajin Wang, Jian Zhang, Jianwei Wu, Qin Zhang et autres

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Lifetime Prediction of Electrical Machines Under Nonstationary Loads by Coupled Thermal Model and Insulation Aging Assessment

Jiajin Wang, Jian Zhang, Kangwen Wu, Xiangning He et autres

Electrical machines (EMs) in electromechanical actuators need to be highly reliable, especially when driving safety-critical systems in more electric aircraft. However, the non-stationary loads faced during mission profiles will cause the EM to overheat, raising the risk of insulation failure. Motivated by …

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Calculation Method for Viscous Loss in Oil-Filled Motors Based on Corrected Friction Coefficient

Jiajin Wang, Yinxin Long, Xiangning He, Kangwen Wu et autres

Oil-filled motors (OFMs) are widely used in deep-sea, aerospace, and other high-reliability applications due to their superior insulation, lubrication, and pressure compensation capabilities. However, the additional viscous loss in the air gap significantly reduces motor efficiency, particularly during high-speed operation. As viscous …

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Remaining Useful Life Prediction Method by Integrating Two-Phase Accelerated Degradation Data and Field Information

Jiajin Wang, Jianwei Wu, Jian Zhang, Qin Zhang et autres

The degradation process of high-reliability products commonly has two-phase characteristics. For such products, accurate change point estimation and proper degradation model play crucial roles in remaining useful life (RUL) prediction. However, due to the long-lifetime nature of high-reliability products, lacking sufficient condition …

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A Two-Phase Lifetime Prediction Model of Generator Stator Main Wall Insulation Driven by Digital Twin

Qin Zhang, Jianwei Wu, Jiajin Wang, Xiaoyan Huang et autres

Currently, most existing remaining useful life (RUL) prediction models for generators’ main wall insulation (MI) focus on the statistical life distributions for a large population of products. The shortcoming of these models is that they cannot incorporate individual degradation information of a …

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Contrastive analysis of cooling performance between a high-level water collecting cooling tower and a typical cooling tower

Miao Wang, Jin Wang, Jiajin Wang, Cheng Shi

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CGDS Near-Bit Geosteering Drilling System and Its Application in China

Wenkai Gao, Limin Sheng, Xiurong Dou, Lei Zhang et autres

Abstract Directional wells and cluster wells have become a conventional drilling technique now, which is widely used in various types of oil and gas reservoirs. Each year, more than half of the total drilling are directional wells in China. The main work …

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A nonlinear method for filtering noise and interference of pulse signal in measurement while drilling

Jiajin Wang

Limited by drilling conditions,it's difficult to transmit signal between ground and down-hole by wire,so at present wireless transmission style which is based on the modulation of drilling fluid pulse is used in practice.However,the channel transmission of drilling fluid pressure,well depth and pump …

Common Method for Calculating Both the Borderline of the Plate Cam with a Roller-swinging-follower and the Cutter Central Path

Jiajin Wang

With the help of the property of instantaneous speed center and being aimed at the plate cam with a roller-swinging-follower,the author has established a set of analytic formulas for calculating both the borderline of the cam and the cutter central path.The formulas …