RESEARCH ON VIBRATION RESPONSE OF WEDGED-RING JOINT STRUCTURE UNDER RANDOM EXCITATION
The axial and transverse vibration experiments to a wedged-ring joint structure are carried out at various power spectrum density (PSD) values. The theoretic model used to predict dynamic responses of the structure at higher PSD values is built according to the experimental data obtained from the experiments at lower PSD values, and then the vibration transfer curves of measurement points are constructed using the vibration transfer model. Based on the analysis of experimental and theoretic response spectrum curves, and fundamental frequencies as well at various PSD values, the relation between response frequencies and random load spectrum values are studied, and the soft nonlinearity of the structure is found and verified. To the axial random vibrations, the theoretic peaks at fundamental frequencies predicted are moderately fit with experimental ones even PSD up to a higher value. To the transverse random vibrations, the theoretic peaks at measurement points on the lower cylinder are well fit with the experimental ones, while for measurement points on the upper cylinder, the peaks predicted by the transfer model are smaller than those obtained by tests, which suggests that the nonlinearity in the joint of the wedged-ring joint structure has an obvious magnification effect, and such effect increases with increasing PSD values.
Zhao Rongguo Chen Zhongfu
Institute of Fundamental Mechanics and Material Engineering, Xiangtan University, Hunan 411105, Chin Southwest Institute of Structural Mechanics, Mianyang, Sichuan 621900, China.
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）