Abstract
Dynamic loads of the connecting bolts in a universal joint can greatly affect the bolt fatigue and fracture, as well as the machinery safety and stability. But few researches focused on those. To obtain the dynamic load characteristics of the connecting bolts in a universal joint, this paper established a flexible dynamic model for the connecting bolts. A multibody dynamic model of a universal joint is developed. The dynamic loads on the connecting bolts of the universal joint are analyzed. The influences of the preloads, speeds and loads are studied. The amplitude and frequency properities are obtained. The effect of the preload is small when the preload is in the range of 80%~120% of the standard value. The load and speed have great influence on the time- and frequency-domain dynamic loads of the bolts. The flexible dynamic model of the connecting bolt is closer to the actual situation than the rigid model since it can consider the preload and deformation of the bolts. This study can provide guidance for the fatigue life prediction of the universal shaft and its bolts.
Highlights
The universal joint has the advantages of the wide power transmission range, simple structure, high reliability and easy to maintenance, which can transmit the torques and power in the mechanical systems
Weijtjens et al [22] obtained the load transfer function for the connecting bolts of the flange in the support structure of the offshore wind power unit based on the in-situ monitoring data
Zhou et al [29] pointed out that the small preload or large external load would lead to the yield deformation on the bolts of the flange in the wind turbine foundation
Summary
The universal joint has the advantages of the wide power transmission range, simple structure, high reliability and easy to maintenance, which can transmit the torques and power in the mechanical systems. A study of the dynamic loads of connecting bolts on the universal joint is necessary. Hu et al [4] conducted the analysis for the connecting bolts the influences of the preload, deformation and displacein the motor suspending of a high-speed train by using the numerical ment were ignored by the rigid modelling method. The dynamic characteristics of the universal joint could affect the load of the connecting bolts. (c) searches studied the dynamic loads and fatigue life of the bolts in the universal joint. This paper presents a flexible dynamic model for the flange connecting bolts in a universal joint. In the presented flexible modeling method, the bolt is regarded as a the shaft under various working conditions is applied to obtain the dynamic loads of the flange bolts.
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