CAJ | 학술논문

利用频响函数法辨识栓接结合部等效动力学参数时，由于实验测量、噪声干扰及数值运算（矩阵求逆）等所致误差，使辨识结果出现不适定性。为避免此问题的产生，使辨识结果能真实反映栓接结合部动态特性，提出新的辨识方法。建立含栓接结合部的整体结构有限元模型，据栓接结合部不同等效刚度与等效阻尼与整体结构归一化频率关系，确定栓接结合部等效刚度与等效阻尼的取值范围，并取该范围的平均值为初值，以实验与仿真整体结构频响函数误差最小为目标确定栓接结合部等效刚度与等效阻尼值。通过实验研究及与文献[16]结果比较表明，采用该方法可达准确辨识栓接结合部等效参数之目的。
이용빈향함수법변식전접결합부등효동역학삼수시，유우실험측량、조성간우급수치운산（구진구역）등소치오차，사변식결과출현불괄정성。위피면차문제적산생，사변식결과능진실반영전접결합부동태특성，제출신적변식방법。건립함전접결합부적정체결구유한원모형，거전접결합부불동등효강도여등효조니여정체결구귀일화빈솔관계，학정전접결합부등효강도여등효조니적취치범위，병취해범위적평균치위초치，이실험여방진정체결구빈향함수오차최소위목표학정전접결합부등효강도여등효조니치。통과실험연구급여문헌[16]결과비교표명，채용해방법가체준학변식전접결합부등효삼수지목적。
In general methods,the measured frequency response functions (FRFs)are usually directly used to identify the characteristics of bolted joints.However,the system’s ill-posed problems may arise due to measurement error and noise effect, and the measurement at mechanical joints may be obstructed by joining mechanisms. A new identification method with FRFs was developed to avoid the ill-posed problem.A finite element model of the whole structure composed of substructures and bolted joints was established and the ranges of equivalent stiffness and equivalent damping were obtained in accordance with the relationship between the parameters of bolted joints and the normalized frequency.The averages of the value ranges of equivalent stiffness and equivalent damping were used as the initial value of the bolted joints model,and the minimal FRFs calculation error between experiment and simulation results was taken as the objective.Finally,the equivalent stiffness and equivalent damping of bolted joints were thus obtained.By comparison of the results of the simulation,the experiment and other literatures,it is shown that the proposed method can significantly improve the accuracy of identification.