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標題: 螺栓結合界面之模擬與實驗驗證
Modeling and Experimental Identification of Bolted Joints
作者: 劉連富
關鍵字: 最佳化;模態;模態標準規範;勁度;正交異向性材料;自然振動頻率;特徵向量;特徵值
出版社: 機械工程學系

The correct modeling of interfaces affects the results of finite element analysis. The stiffness of interface was usually modeled by spring elements. Although this approach achieves the purpose of modeling interfaces, the time spent on creating the finite elements model is significant. This thesis uses orthotropic interface element to simulate the stiffness of interface. The stiffnesses in the three orthotropic directions can be easily modeled. The time spent on modeling the interfaces is greatly reduced.
The design variables used for modeling the interface are Young's moduli and shear moduli. The modal test is performed to get the test frequencies and partial mode shapes. The optimization method is used to find the optimum values of Young's and shear moduli. The objective of the optimization is to minimize the differences of measured and analyzed natural frequencies. The constraints are imposed to guarantee a certain value of modal assurance criterion between measured and analyzed mode shapes. The refined finite element model is expected to be more reliable. The effect of different torques and diameters of bolts on the stiffness of interface will be discussed.
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