Abstract
The multiple corrugated diaphragm (MCD) coupling is a new flexible coupling developed based on the diaphragm and diaphragm disc coupling. Compared to traditional couplings, the MCD coupling has the advantages of high torque diameter, high torque weight, and high compensation capability. It is more suitable for high power speed and high power density working conditions. The MCD coupling is subjected to axial, angular, torque, and centrifugal force loads. The fatigue failure caused by alternating stress is the primary failure mode of the coupling. The fatigue life of the MCD coupling cannot be accurately calculated because of the complexity of the force in operation. Some theoretical simplifications can only obtain the approximate result. In this paper, a parameterized finite element model of the MCDs is established. A method for calculating the fatigue safety factor of the MCD coupling is proposed based on a modified Goodman curve to know the design of the MCD coupling. The feasibility of this method is verified by the fatigue life test of the coupling.
Highlights
Shock and Vibration discussed the metal components of the coupling and summarized the categories and suitable types of various metal components in the coupling [13]
A method for calculating the fatigue safety factor of the multiple corrugated diaphragm (MCD) coupling is presented based on the third strength theory and modified Goodman curve. en, the fatigue life test method of the MCD coupling is designed. e axial fatigue life test and angular fatigue life test are carried out, which verify the feasibility of the calculation method of the fatigue safety factor of the MCDs to a certain extent
It can be seen from the stiffness curves before and after the fatigue life test of the MCDs in Figures 7 and 8 and the stiffness values of MCD assemblies before and after the fatigue test in Table 3 that, after the axial fatigue test, the axial stiffness of 1# MCD assemblies decreased by 2.46%, and the axial stiffness of 2# MCD assemblies decreased by 3.10%; after the angular fatigue test, the axial stiffness of 1# MCD assemblies and 2# MCD assemblies decreased by
Summary
Disk couplings require very high processing technology and unique materials mainly because they adapt to moderate flexibility, so fatigue strength is their main performance index. According to the third strength theory, the static and dynamic working stresses of the MCD can be obtained as follows [30]. Under this cyclic characteristic, the line between the composite stress P of static and dynamic stresses and the origin O and the intersection point of the modified Goodman curve is M. It is safe when the ratio of A to B is more significant than one. E safety factor at each position of the MCD profile line is greater than 1, and the minimum value is 1.34, which meets the design requirements
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