Abundant nonlinear factors included in bolted flange joint, like contact and gap, make dynamic analysis more complex and lower inefficient, constructing simplified dynamic model is one of the main means to improve computational efficiency. By treating the bolted flange joint as a black box, and cutting out a part of the vertical section from the bolted flange joint structure, a “local joint structure” is formed. After obtaining the contact characteristic of junction surface, a single bolted joint is simplified by using some spring-damping elements whose tension rigidity and compression rigidity is different, then a simplified dynamic model of the local joint structure is built. The simplified dynamic model’s parameters are identified by using the force state mapping method. Dynamic test data shows that the prediction errors of the simplified dynamic model of the bolted flange joint are not more than 20%.
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