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Deformable Surface 3D Reconstruction from a Single Image by Linear Programming
( Wenjuan Ma ),( Shusen Sun ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.6
We present a method for 3D shape reconstruction of inextensible deformable surfaces from a single image. The key of our approach is to represent the surface as a 3D triangulated mesh and formulate the reconstruction problem as a sequence of Linear Programming (LP) problems. The LP problem consists of data constraints which are 3D-to-2D keypoint correspondences and shape constraints which are designed to retain original lengths of mesh edges. We use a closed-form method to generate an initial structure, then refine this structure by solving the LP problem iteratively. Compared with previous methods, ours neither involves smoothness constraints nor temporal consistency, which enables us to recover shapes of surfaces with various deformations from a single image. The robustness and accuracy of our approach are evaluated quantitatively on synthetic data and qualitatively on real data.
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Adaptive robust control for fully electric pitch system of tank with dynamic friction compensation
Darui Lin,Xiuye Wang,Guolai Yang,Shusen Yuan,Qinqin Sun 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
This article addresses a problem of dynamic friction compensation for fully electric pitch system of tank based on modified LuGre model. Aiming to design a controller to realize friction modeling and compensating of fully electric pitch system of tank in large range of motion speeds. First, a nonlinear mathematical model including modified friction model and time-varying disturbance is established for fully electric pitch system of tank. Second, a disturbance compensation robust feedback term is designed to compensate the time-varying disturbance to reduce the impact of the disturbance on the control performance by adaptive estimation of the upper bound of the unmodeled disturbance. Third, the uncertainty parameters and friction state of the system are estimated and the adaptive control law combined with friction compensation is designed to reduce the sensitivity of the system to parameter uncertainty and nonlinear friction. Fourth, the global stability of the system is proved by Lyapunov stability theory. Finally, a virtual prototype model of tank moving based on friction disturbance and road excitation is established. The co-simulation results show that the proposed method can accurately estimate and compensate model parameters, nonlinear friction states and disturbances, and has the advantages of high control precision, good stability and strong robustness.
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Na Mi,Guirui Yu,Wuefa Wen,Xiaomin Sun,Shusen Wang,Leiming Zhang,Xia Song 한국기상학회 2009 Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.2
The Qianyanzhou (QYZ) forest site is located in the mid-subtropical region under typical subtropical continentalmonsoon climate. Despite its plentiful water and heat resources, changes in their seasonal distributions result in frequent occurrences of seasonal drought, influencing both the structure and function of forest ecosystems. In order to examine the effects of drought stress on energy and water fluxes and the related physiological processes, we used tower flux measurements from 2003 and 2004 from the QYZ site and the ecosystemmodel EALCO (Ecological Assimilation of Land and Climate Observations). The model explained almost 90%of the variance in the daily LE for both years; whereas 71%and 55% of the variance in H for 2003 and 2004, respectively. Simulations suggested that, during the 2003 summer drought, about 80% of water extraction by roots occurred below 0.45 m, and canopy stomatal conductance decreased in response to soil dryness at a threshold r (relative water content) of 0.5 m. The response of canopy stomatal conductance appeared to be linked to the soil water exposed to themajority of the roots, even if substantialwater was being extracted fromgreater depth. The decrease of canopy stomatal conductance made the ratio of transpiration to ET relatively constant along the years with only a small difference. The different extent of the seasonal drought resulted in different water fluxes for the two years with more distinct influence on evaporation than on transpiration.
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