关键词: 振动与波, 球面网壳结构, 小波变换, 尺度能量比率, 间歇能量比率, 间歇因子

Abstract: The wind pressure measurement of a rigid model for long-span spherical shells was conducted in TJ-3 wind tunnel laboratory. In this paper, the continuous and discrete wavelet transform (CWT) are applied to the wind pressure signal to obtain intermittent events and wavelet coefficients of individual time series, respectively. Scale energy ratio, intermittent energy ratio and intermittent factor are studied by comparing them with the wind pressure from different location on the surface of the structure. Conclusions are drawn as follows: (1) At scale 11, the scale energies at circumferential measuring points have little changes with the position variation; but at scale 12, the scale energies at lateral measuring points 1-7 and 1-19 are significantly greater than those in other areas, about twice of those at points 1-1 and 1-13 in the windward and leeward areas, respectively. (2) Intermittent energies at points 1-7 and 1-19 mainly occur at scale 11, but the intermittent energies at point 1-1 and 1-13 are uniformly distributed with different scales. (3) Intermittent factors at points 1-1, 1-7, 1-13 and 1-19 have similar trend with different scales, which change slightly at low scales and increase rapidly at high scales. Therefore, we can see that the intermittent characteristics of wind pressure is different at different locations. These conclusions may be helpful for futher analysis of wind pressure characteristics.

Key words: vibration and wave, spherical shells, wavelet transform, scale energy ratio, intermittent energy ration, intermittent factor