本文针对粘弹性自由阻尼结构，基于模态应变能法推导出同时考虑粘弹性阻尼损耗因子和弹性模量频变效应的模态损耗因子修正公式，并选取某压筋板进行了计算和验证。在此基础上，以船舶阻尼加筋板为研究对象，开展随机响应试验研究，并对试验模型的模态损耗因子和随机响应进行了数值计算和对比分析。结果表明，采用该修正公式确定粘弹性自由阻尼结构的模态损耗因子，进而计算随机响应的方法是可行的。该方法对阻尼减振的相关分析研究具有参考价值。
For viscoelastic unconstrained damped structures, the modal loss factor correction formula considering both the viscoelastic damping loss factor and the elastic modulus frequency change effect is derived based on the modal strain energy method, and a ribbed plate is selected for calculation and verification. Random response experiment was carried out for a ship damping stiffened plate. The modal loss factor and random response of the model were numerically calculated and compared. The results show that it is feasible to determine the modal loss factor of unconstrained damped structures with the modified formula and calculate the random response. The method has reference value for the correlation analysis of vibration damping.
2020,42(1): 62-67 收稿日期：2018-10-16
DOI：10.3404/j.issn.1672-7649.2020.01.013
分类号：U661.33
作者简介：陈威(1993-),男,硕士研究生,主要研究船体振动、阻尼减振
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