Development of an Estimation Method of Dynamic Characteristics of Structures with Bolted Joints
Development of an Estimation Method of Dynamic Characteristics of Structures with Bolted Joints
复制标题
螺栓连接结构动力特性估计方法的发展
DOI：
10.1299/kikaic.73.1566
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Endo
中科院分区：
文献类型：
--
作者：
Y. Kishimoto;M. Endo
螺栓连接广泛用于装配各种结构，螺栓连接的状况显着影响结构的动力特性。这个问题给精密机械设计或结构地震对策带来了困难。本研究的目的是利用摩擦学理论从微观角度阐明螺栓连接结构的接触表面状况，并开发一种结构整体动态特性的估计方法。首先，提出了根据拧紧扭矩的大小来估计螺栓连接结构的固有频率和阻尼比的方法。估算过程分为 4 个步骤，即估算：(1) 根据紧固扭矩估算紧固力，然后逐步估算 (2) 接触压力，(3) 接触刚度和摩擦损失，最后 (4) 结构的固有频率和阻尼比。该方法实际应用于板和法兰结构，首先估计固有频率和阻尼比，然后进行实验测量。结果表明，计算结果与实验结果吻合较好，验证了所提估计方法的实用性和普适性。
Bolted joints are widely used to assemble various structures, and the conditions of bolted joints significantly affect the dynamic characteristics of structures. This problem causes the difficulties for designing precision machinery or earthquake countermeasures for structures. The aim of the present research is to clarify the contact surface conditions of structures with bolted joints from the microscopic aspect by tribological theory and to develop an estimation method of global dynamic characteristics of structures. First, the method to estimate the natural frequency and damping ratio of structures with bolted joints from the magnitude of tightening torque is proposed. The estimating process is divided into 4 steps, i.e., estimating, (1) tightening force from the tightening torque, and then step by step, (2) contact pressure, (3) contact stiffness and friction loss and finally, (4) natural frequencies and damping ratios of structures. The proposed method was actually applied to the plate and flange structures, and the natural frequencies and damping ratios were first estimated and then those were measured experimentally. It was shown that the calculated results are in good agreement with the experimental results, resulting in the verification of the usefulness and universality of proposed estimation method.