Nonlinear dynamic characteristics of bolted joints for various pretension forces
ZHAO Tong1, GUO Junjie1, LÜ Yuhong2
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; 2. AECC Shenyang Engine Research Institute, Shenyang 110015, China
Abstract：The influence of the bolt pretension force on the dynamic characteristics of bolted joints was studied using a double bolt joint with an equivalent single DOF model based on the lumped parameter method near the first mode. Then, the equivalent dynamic parameters were obtained for various bolt preloadings using modal and excitation tests. The equivalent nonlinear dynamic parameters for the joint were then identified using the force-state mapping method for various pretension forces. The results show that the joint nonlinearity increases with decreasing pretension force. Therefore, the nonlinear joint dynamics must be considered for low pretension forces.
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2019, Vol. 59 
