CONTACT INTERFACE PARAMETER IDENTIFICATION OF BOLTED JOINT STRUCTURE WITH UNCERTAINTY USING THIN LAYER ELEMENT METHOD
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摘要: 提出了一种螺栓连接接触面不确定性参数识别方法,首先采用薄层单元对接触面进行参数化,然后根据不确定性识别方法识别薄层单元参数。以四螺栓搭接结构试验模型为研究对象,开展接触面不确定性参数识别方法仿真研究。采用Monte-Carlo方法构造待识别参数真实值样本,代入基准有限元模型中计算获得具有统计意义的仿真试验数据;采用不确定性参数识别方法预测薄层单元参数均值与标准差,仿真结果表明：该方法能够较为准确的模拟接触面法向和切向接触刚度,并显著提高连接结构的建模效率,建立反映真实结构动态性能统计特征的有限元模型。Abstract: An approach to identifying the contact interface parameters of bolted joint structure with uncertainty is proposed in this paper. Thin layer element theory is firstly adopted to parameterize the contact interface, and then the parameters of thin layer element are identified using the uncertain parameter identification approach. Simulation is conducted to verify the proposed method based on an experimental model, which is an assembled structure with four bolted joints. Adopting the Monte-Carlo sampling method to construct test samples, numerical simulation results show that when considering the uncertainty in contact interface parameters of bolted joint structure, the proposed uncertain parameter identification method can be used to accurately identify the mean value and the standard deviation of the elastic modulus, the normal and tangential stiffness of the contact interface are simulated with satisfactory. The dynamical finite element model with statistical significance can be constructed at the same time.
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Keywords:
- bolted joint /
- contact interface /
- thin layer element /
- uncertainty /
- parameter identification
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