Papers by Author: Yi Liu

Abstract: The passing dam building of Xiangjiaba water conservancy project adopts gear-rack climbing vertical structure. The structure demands highly on the deformation compatibility of relative displacement between tower and nut column, and rack and guide. If it is constructed poorly, it will directly influence the ship lifts running and construction period. The paper takes this as its key research object. 3D FEM is used to analyze the tower structure, mainly calculating the deformation of the tower under the temperature, weight, wind load and other loads in a normal single case and combination cases. By focusing on the theory analysis of the important parts such as nut column, rack and guide, the structures deformation fitness, this paper offers a fair theoretical reference and technological guidance to the construction of every part of the tower.

Abstract: Using TBD to reduce the minimum detectable SNR can be used to detect weak targets of pulsed laser radar sensor. Firstly, the pretreatment measures are given to enhance the single frame SNR. Especially, with the width characteristic of laser target under high sampling rate, the down-sampling method is introduced, which can not only eliminate a large number of single-point noises, but also can solve the acquisition problem of relatively stationary or low-speed targets. Then the TBD algorithm based on HT is proposed. Finally, the experiments indicate that the algorithm has good detection performance and can detect single and multiple targets.