【摘要】 为了对附加阻尼结构的振动响应进行准确计算,提出了一种考虑阻尼材料频变特性的结构响应计算方法,可以准确提取附加阻尼结构的模态参数并计算振动响应。阻尼材料的材料属性会受到激励频率的影响而变化,导致附加阻尼结构的建模和振动响应计算不够精确;因此在传统模态应变能法的基础上,建立了考虑材料频变特性的改进模态应变能法,提取了复合结构的模态参数,并通过模态试验验证了所提取模态参数的准确性;并在振动响应计算中准确计入了模态参数,对比了测试点在仿真和试验中的加速度频响曲线,验证了响应计算方法的准确性。结果表明该方法可以准确提取附加阻尼结构的模态参数,并能在一定频段范围内准确计算其振动响应。更多还原

【Abstract】 In order to accurately calculate the vibration response of an additional damping structure, a structural response calculation method which considers the dynamic characteristics of the damping materials was proposed, which can accurately extract the modal parameters and calculate the vibration responses of the additional damping structure. The material properties of damping materials are affected by the excitation frequency, which may cause the calculation of the vibration response inaccurate. Based on the traditional modal strain energy method, an improved modal strain energy method considering the dynamic characteristics of materials was established. The modal parameters of the composite structure were extracted accurately, which were verified by a modal test. Then the modal parameters were accurately substituted into the structural vibration response calculation. By comparing the acceleration frequency response curves of the observation points in simulation and experiment, the accuracy of the response calculation method was verified. The results show that the modal parameters of the additional damping structure can be accurately extracted and the vibration response of the structure can be calculated by this method.更多还原