Modal testing and modelling the dynamic characteristics of a plate with bolted joints

Abstract

Modelling the dynamic characteristics of the bolted joints in a complex assembled structure with a high accuracy is very challenging due to the assumptions and uncertainties in the input data of the FE model. In this paper, the identification of the dynamic characteristics of the bolted joints structure using the CBUSH element connector is proposed. Modal testing and normal modes analysis are conducted on a thin plate assembled structure with bolted joints. In the simulation work, the CBUSH element connector is employed and the stiffness coefficient for six degrees of freedom is computed based on four flexibility formulae. The predicted natural frequencies and their corresponding mode shapes are compared against the results of the experimental work. A good agreement of the FE model is achieved by using the coefficient of stiffness as represented in the Swift flexibility formula. The study justifies that the dynamic characteristics of the bolt joints could be accurately modelled by using the CBUSH element connector. The obtained findings provided an alternative approach to modelling the dynamic characteristics of a thin plate assembled structure with bolted joints.

Effective Practices for Educators to Increase Online Interaction Quality

“…He furtherclaimed that "Students" greatest emotional fear appeared to be that of alienation-being an outsider without friends and in this case to the usage of technology for the learning purpose. Ateerah et al (2021) highlighted that if the students manage to overcome that fear, they could meet others virtually during lessons to sustain their emotional well-being. Thus, it is understood that educators should encourage students to develop a healthy friendship as well as to obtain a well connection with educators.…”

Stiffness as a criterion of dynamic load carrying capacity of tension-loaded bolted joints

“…The most common separable connections in machine systems are bolted joints [1][2][3]. Designing bolted joints is a responsible engineering activity because the connection points are often the most dangerous places, where fractures or loss of hermeticity occur most often, due to insufficient strength or stiffness [4,5]. The experience of applying bolted joints shows that the joint stiffness is in most cases less than the stiffness of the individual parts that are joined, so this should be taken into account when designing and calculating bolted joints.…”