国防科技大学学报2017，Vol.39Issue(6)：79-87,9.DOI:10.11887/j.cn.201706013
脉冲激励下船舶结构谐振响应预报及其模态阻尼参数识别
Ship structure resonance response prediction and modal damping parameter identification under effect of impulse excitation
摘要
Abstract
Starting from the basic principle of modal identification,and the expressions were derived for time frequency response of the excitation force and time response of resonant excitation,and the relationships among the time-frequency domain amplitudes were found.It was concerned that the associated free vibration in the resonant response is difficult to decay in a short time,and it was pointed out that the amplitude of the impulse frequency response spectrum at corresponding frequency is equal to the amplitude of forced vibration under resonant excitation.Based on establishing relationship of response equivalence,the formula of damping ratio was derived by a limited spectral information of impulse response spectrum.The accuracy of response prediction and damping ratio estimation was verified by ship girder model.In addition,the first eight modal damping ratios' tests of 2 typical ship plate element models of different materials were also completed,and the rapidity and reliability of the method were verified by the numeral calculation binding experimental response frequency spectrum.关键词
脉冲激励/谐振激励/响应频谱/模态阻尼比/伴随自由振动/快速预报Key words
impulse excitation/resonant excitation/response spectrum/modal damping ratio/associated free vibration/fast prediction分类
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唐宇航,陈志坚,梅志远..脉冲激励下船舶结构谐振响应预报及其模态阻尼参数识别[J].国防科技大学学报,2017,39(6):79-87,9.基金项目
国家自然科学基金资助项目(51479205) （51479205）
