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Jun Zheng,Dongsong Sun,Tingdi Chen,Ruocan Zhao,Yuli Han,Zimu Li,Anran Zhou,Nannan Zhang 한국광학회 2018 Current Optics and Photonics Vol.2 No.2
A Scanning Rayleigh Doppler lidar for wind profiling based on a non-polarized beam splitter cube optically contacted FPI is developed for wind measurement from high troposphere to low stratosphere in 5-35 km. Non-polarized beam splitter cube optically contacted to the FPI are used for a stable optical receiver. Zero Doppler shift correction is used to correct for laser or FPI frequency jitter and drift and the timing sequence is designed. Stability of the receiver for Doppler shift discrimination is validated by measuring the transmissions of FPI in different days and analyzed the response functions. The maximal relative wind deviation due to the stability of the optical receiver is about 4.1% and the standard deviation of wind velocity is 1.6% due to the stability. Wind measurement comparison experiments were carried out in Jiuquan (39.741°N, 98.495°E), Gansu province of China in 2015, showing good agreement with radiosonde result data. Continuous wind field observation was performed from October 16th to November 12th and semi-continuous wind field of 19 nights are presented.
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Jinfeng Dong,Haiqing Liu,Shengyong Xia,Yang Cheng,Ming Lei,Zimu Chen 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.3
In order to study the structural stability of the disc-buckle type formwork support, the multi-parameter experimental analysis of the disc-buckle type formwork support structure was carried out by using experimental and fi nite element analysis method. The infl uence parameters of working conditions, lift height, diagonal bracing and sleeve on the structural stability bearing capacity was mainly considered. The regularity of the buckling direction of the vertical pole, the stress at each typical position on the vertical pole and the axial force of the vertical pole was studied based on the experimental results. Based on the characteristics of semi-rigid connection joints, the correctness of the experimental results was verifi ed by fi nite element analysis, and the results show that reducing lift height and arranging diagonal bracing have remarkable infl uence on improving the structural stability bearing capacity. The usage of sleeves has little infl uence on the structural stability, and the corner pole was the worst position of the overall structural stability. The factors of working conditions and diagonal bracing have the remarkable infl uence on the buckling direction of the vertical pole. The factor of working condition has the most obvious infl uence on the stress uniformity of the vertical pole. The axial force of the vertical pole in the disc-buckle type formwork support structure presented a relatively uniform state from bottom to top in the loading process. The arrangement of diagonal bracing and the usage of sleeves have an infl uence on the uniformity of the axial force of the vertical pole. Compared with the fi nite element results, the error of the structural stability bearing capacity was within 6%, indicated that the fi nite element can accurately simulate the structural stability bearing capacity.
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