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Problems that should be paid attention to in the diaphragm coupling device and the fatigue analysis of the diaphragm

Device measures:
Before the diaphragm coupling is installed, the end faces of the two shafts should be cleaned, and the matching conditions such as the key and groove of the end faces should be checked; after the diaphragm coupling is installed, it should be operated normally for one shift and the screws should be checked; in order to avoid the fretting wear of the diaphragm during high-speed operation , leading to microcracks in the diaphragm bolt holes and damage, you can apply a solid lubricant such as molybdenum disulfide between the diaphragms or treat the surface of the diaphragm with an anti-friction coating; Overload use and the occurrence of operation accidents; during the operation of the work, you should always check whether the diaphragm coupling has abnormal phenomena, and if there is an abnormal phenomenon occur and carry out maintenance; in case of personal injury and equipment damage caused by the operating diaphragm coupling Appropriate safety protection measures shall be taken at each site of the accident. Pay attention to the problem of the coupling device, and handle the installation correctly. Regular observation, inspection, maintenance work, practical installation.

The development of diaphragm coupling:
With the continuous development of technology, wind power generation technology has developed rapidly in the world, more and more megawatt-level large-scale wind power generation units have been built and put into operation, and the wind power market has a very bright prospect. The diaphragm coupling is an important part of the wind turbine, and the metal diaphragm is the key part of the diaphragm coupling, through which the torque and motion are transmitted, and its design will directly affect the normal operation of the entire unit Therefore, it is necessary to carry out vibration analysis and fatigue calculation on the diaphragm coupling in the design stage to provide a basis for the permanent design of the coupling. Under such a background, the subject research of this paper is to carry out the vibration analysis and fatigue calculation of the diaphragm coupling of the wind power generating set in response to the needs of an enterprise.

This paper mainly conducts the following research:
①Based on the multi-body dynamics theory, a multi-rigid-body virtual prototype of the diaphragm coupling was established using the virtual simulation software ADAMS. At the same time, on the basis of the multi-rigid body model, the flexible treatment of the diaphragm is carried out, and the rigid-flexible coupling model of the coupling is established to ensure the dynamic response of the diaphragm.
②According to the diaphragm stress-time history of the rigid-flexible coupling analysis, combined with the fatigue analysis software FATIGUE, the fatigue analysis of the diaphragm is carried out, and the fatigue damage diagram and fatigue life of the diaphragm are obtained.
③Based on the vibration theory and combined with the finite element analysis software PATRAN/NASTRAN, the finite element model of the diaphragm coupling machine was established. Through modal analysis, the first 10 order vibration shapes and natural frequencies of the coupling were obtained, and then calculated The first five critical speeds of the coupling were compared to its operating speed to verify that resonance would not occur. Therefore, this paper provides the basis for the analysis and independent design of the diaphragm coupling, which has important theoretical significance and engineering practical value for enterprises to solve the problems of coupling vibration and life, and for enterprises to reduce design defects in the design process, It has important theoretical significance and practical value to shorten the cycle, reduce production costs, respond to user needs and market changes, and improve the competitiveness of enterprises.
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