摘要
针对弹性薄板结构在固有模态频率处振动过大的情况,对其进行了吸振控制的理论及实验研究。以典型简支板为控制对象,运用有限元方法设计了变阻尼层复合梁式吸振器并分析了其吸振效果,进一步通过实验对所获结论进行了验证,数值分析和实验测试结果一致表明:随着长度增加,用于吸振模态个数增加,吸振频带变宽,但每个频率上的吸振效果下降;对于板振动系统,具有较好的吸振效果的安装区域为激振点附近区域;复合梁用于吸振的模态阶数越低,吸振量越大。
To study the dissipation of the unwanted vibration energy of a plate vibrating at modal frequencies, academic and experimental researches on composite beam, which is attached to the plate and used to control the plate＇s vibration, were carried on. A simply-supported plate was selected as the classical object to be controlled, and finite element method was applied to design and analyze the vibration absorption of composite beams with various cross-sections unconstrained layers. Then, the experiment was operated to validate the conclusions derived from simulation. Both the analysis results and the experimental data indicate that the number of modes used to attenuate the energy of the plate and the frequency bandwidth of the absorber grow with the increase of beam length, while the absorption at each modal frequency of the beam decreases in such situation; the absorber fitted at the location near the driving point is excellent in mitigating vibration energy of plate; the lower order mode of the beam is applied to absorb the plate＇s energy, the greater absorption will be achieved.
出处
《振动与冲击》
EI
CSCD
北大核心
2011年第8期51-55,共5页
Journal of Vibration and Shock
基金
国家自然科学基金(50675177)
西北工业大学博士论文创新基金(cx201003)
关键词
动力吸振器
复合梁
实验研究
dynamic absorber
composite beam
experimental study
