Dr. Makoto Imura Profile

Dr. Makoto Imura

at Hitachi,Ltd.

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Proceedings Article | 2 June 2014 Paper

Stress analysis of bolted joints under centrifugal force

Makoto Imura, Motonobu Iizuka, Shigeki Nakae, Takeshi Mori, Takayuki Koyama

Proceedings Volume 9234, 923409 (2014) https://doi.org/10.1117/12.2054069

KEYWORDS: Interfaces, Finite element methods, Head, Magnetism, Fourier transforms, Stress analysis, Analytical research, Prototyping, Sensors, Safety

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Our objective is to develop a long-life rotary machine for synchronous generators and motors. To do this, it is necessary to design a high-strength bolted joint, which is responsible for fixing a salient pole on a rotor shaft. While the rotary machine is in operation, not only centrifugal force but also moment are loaded on a bolted joint, because a point of load is eccentric to a centre of a bolt. We tried to apply the theory proposed in VDI2230-Blatt1 to evaluate the bolted joint under eccentric force, estimate limited centrifugal force, which is the cause of partial separation between the pole and the rotor shaft, and then evaluate additional tension of a bolt after the partial separation has occurred. We analyzed the bolted joint by FEM, and defined load introduction factor in that case. Additionally, we investigated the effect of the variation of bolt preload on the partial separation. We did a full scale experiment with a prototype rotor to reveal the variation of bolt preload against tightening torque. After that, we verified limited centrifugal force and the strength of the bolted joint by the VDI2230-Blatt1 theory and FEM considering the variation of bolt preload. Finally, we could design a high-strength bolted joint verified by the theoretical study and FEM analysis.

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