Search Result

Journals

Publication Years

Keywords

Please wait a minute...

For Selected:

Download Citations
EndNote Ris BibTeX

Toggle Thumbnails

Select

Experimental Study on Intermittent Characteristics of Wind Pressure on Long-span Spherical Shell’s Surface

WANG Xu;HUANG Peng;GU Ming

2011, 31 (6): 15-19. DOI: 10.3969/j.issn.1006-1355-2011.06.004

Abstract （1574）

Save

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.

Related Articles | Metrics

Select

《Calculation Method for Galloping Characteristics of Quasioval Iced Conductor》

MA Wen-yong;GU Ming;HUANG Peng

2009, 29 (6): 91-96. DOI: 10.3969/j.issn.1006-1355.2009.06.091

Abstract （2246）

PDF（pc）（1397KB）（1491）

Save

The quasioval iced conductor model was tested in TJ2 wind tunnel to obtain aerodynamic force coefficients by using HighFrequencyForce Balance (HFFB) technique. The calculating theory of galloping characteristics of SDOF is derived, which take account of natural vibration characteristics of transmission line. The effects of wind velocity, sagspanratio, span, conductor diameter on galloping critical wind velocity and amplitude are studied and approximate method to calculate galloping characteristic of quasioval iced conductor are presented at last.