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Thermal Comfort Measurement and Landscape Reconstruction Strategy of Street Space Based on Decomposition grid method:A Case Study of Yangmeizhu Street

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Journal of Landscape Research 2020年第3期12卷 33-38,46页

作者： YANG Xin HE Shuang ZHANG Qi School of Architecture and Art North China University of TechnologyBeijing 100043China View Unlimited Landscape Architecture Studio of China Urban Construction Deisgn&Research Institute Co. LtdBeijing 100120China

As an important public space in the city,street space is the second residence of *** Yangmeizhu Street as the research object,this study established a street microclimate model in Beijing through microclimate measurement and simulation,and then calculated thermal comfort index of the street and evaluated thermal comfort of the street space and distribution *** evaluation method used grid method to decompose and study and made several 10m×10m grids for inner space of the street,so as to compare deeply difference of microclimate environment in the street and analyze quantitatively relevance between street space elements(street pavement,street greening,building shadow coverage)and thermal comfort(physiological equivalent temperature PET)in the ***,adaptive strategy of microclimate on street level was put forward to improve the environmental quality of public space in the old city by means of landscape design,aiming at creating a resilient and humanized street space and improving adaptability of microclimate and thermal comfort for living.

关键词： Thermal comfort grid method Street space Yangmeizhu Street Microclimate environment

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Wave propagation across fluid-solid interfaces:a grid method approach

Wave propagation across fluid-solid interfaces:a grid method...

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中国科学院地质与地球物理研究所2004学术年会

作者： Jianfeng Zhang Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China.

This paper presents a new numerical technique for modelling wave propagation in media with both fluid(acoustic) and solid(elastic) regions,as found for instance in a marine seismic case. The scheme can correctly satisfy the fluid-solid interface conditions and accurately models the arbitrary interface *** work is an extension of the grid method,which is able to model wave propagation in heterogeneous solid(elastic) media with arbitrary surface topography and irregular *** scheme is developed by formulating the problem in terms of displacements in elastic regions and pressure in acoustic regions with an explicit boundary between *** fluid-solid interface conditions on this explicit boundary are implemented by introducing an integral approach to the fluid-solid interface *** solution in terms of pressure in acoustic regions together with this integral approach means that no extra computational cost is needed to implement the fluid-solid interface conditions for a complex geometry,instead of resulting in additional computations as with the spectralelement, finite-element or finite-difference *** this paper an acoustic grid method is developed to solve the acoustic problem inside the fluid,and the(elastic) grid method,which is improved based on a parsimonious staggered-grid scheme,is used to solve the elastic problem inside the *** numerical dispersion and stability criteria for the acoustic grid method are discussed in *** with an analytical solution demonstrates that the proposed scheme handles the fluid-solid interface conditions *** of wave propagation in a mixed fluid/solid model with both weak and strong sinusoidal fluid-solid interfaces illustrate the suitability of the proposed scheme for modelling wave propagation across fluid-solid interfaces with complex geometries.

关键词： finite difference grid method marine seismic modelling sea bottom topography

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NUMERICAL SIMULATION OF ELASTIC WAVE PROPAGATION IN ANISOTROPIC MEDIA

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Acta Mechanica Solida Sinica 2000年第1期13卷 50-59页

作者： Zhang, JF Liu, TL Dalian Univ Technol State Key Lab Struct Anal Ind Equipment Dalian 116024 Peoples R China

A new numerical simulation algorithm is presented for the elastic wave propagation in heterogeneous anisotropic media. We make discretization of the computational domain by using triangular and quadrangular grids. The scheme is based on integral equilibrium at each node to simulate the elastic wave propagation in heterogeneous anisotropic media. The scheme is very flexible in dealing with arbitrary surface topography, inner openings, liquid-solid boundaries and irregular interfaces. Moreover, tho free-surface condition of complex geometrical boundaries can be satisfied naturally. This work is an extension of the grid method for the elastic wave propagation in heterogeneous isotropic media, and a quadrangular grid with low computational cost is also introduced.

关键词： numerical modeling anisotropy finite difference grid method

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Classified denoising method for laser point cloud data of stored grain bulk surface based on discrete wavelet threshold

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International Journal of Agricultural and Biological Engineering 2016年第4期9卷 123-131页

作者： Shao Qing Xu Tao Yoshino Tatsuo Song Nan Zhu Hang School of Mechanical Science and Engineering Jilin UniversityChangchun 130022China

Surfaces of stored grain bulk are often reconstructed from organized point sets with noise by 3-D laser scanner in an online measuring *** a result,denoising is an essential procedure in processing point cloud data for more accurate surface reconstruction and grain volume calculation.A classified denoising method was presented in this research for noise removal from point cloud data of the grain bulk *** on the distribution characteristics of cloud point data,the noisy points were divided into three types:The first and second types of the noisy points were either sparse points or small point cloud data deviating and suspending from the main point cloud data,which could be deleted directly by a grid method;the third type of the noisy points was mixed with the main body of point cloud data,which were most difficult to *** point cloud data with those noisy points were projected into a horizontal *** image denoising method,discrete wavelet threshold(DWT)method,was applied to delete the third type of the noisy *** kinds of denoising methods including average filtering method,median filtering method and DWT method were applied respectively and compared for denoising the point cloud *** results show that the proposed method remains the most of the details and obtains the lowest average value of RMSE(Root Mean Square Error,0.219)as well as the lowest relative error of grain volume(0.086%)compared with the other two ***,the proposed denoising method could not only achieve the aim of removing noisy points,but also improve self-adaptive ability according to the characteristics of point cloud data of grain bulk *** results from this research also indicate that the proposed method is effective for denoising noisy points and provides more accurate data for calculating grain volume.

关键词： point cloud data denoising grid method discrete wavelet threshold(DWT)method 3-D laser scanning stored grain

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MICRO-EXPERIMENTAL STUDY OF LARGE PLASTIC DEFORMATION FOR HIGH-PURITY POLYCRYSTALLINE ALUMINUM

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Acta Mechanica Sinica 1991年第4期7卷 360-368页

作者：仲政杨卫黄克智 Currently in the Department of Engineering Mechanics Tongji University. Tsinghua University Beijing 100084China

This paper aims at revealing various micro- deformation characteristics, such as crystalline slip and grain boundary slide, which are recorded under scanning electronic microscope for high-purity aluminum tensile specimen at room temperature. These experimental data provide us direct evidence for shear localization near the grain boundary network via multi- directional grain boundary slide. The nonuniform deformation induced in the grain interiors would have decisive effect on the plastic flow and failure of polycrystalline materials.

关键词： polycrystals large plastic deformation grain boundary sliding micromechanics grid method

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Robot Global Path Planning Based on an Improved Ant Colony Algorithm

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Journal of Computer and Communications 2016年第2期4卷 11-19页

作者： Jingang Cao Department of Computer North China Electric Power University Baoding China

Aiming at the disadvantages of the basic ant colony algorithm, this paper proposes an improved ant colony algorithm for robot global path planning. First, adjust the pheromone evaporation rate dynamically to enhance the global search ability and convergence speed, and then modify the heuristic function to improve the state transition probabilities in order to find the optimal solution as quickly as possible;and finally change the pheromone update strategy to avoid premature by strengthening pheromone on the optimal path and limiting pheromone level. Simulation results verify the effectiveness of the improved algorithm.

关键词： Path Planning Ant Colony Algorithm grid method

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The method Based On Dijkstra Of Multi-directional Ship’s Path Planning

The Method Based On Dijkstra Of Multi-directional Ship’s Pa...

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第32届中国控制与决策会议

作者： Zihui Cheng Huajun Zhang Qin Zhao Automated Institute Wuhan University of Technology

Aiming at the problem of the shortest path’s optimization for direct navigation of ships,the Dijkstra algorithm search is *** environment of the ship’s navigation area was modeled by rasterization and *** the four-direction search,eight-direction search and arbitrary-angle search based on the Dijkstra algorithm were improved,and the three search methods were *** experiments and research results show that the improved arbitrary angle search method can best meet the requirement of the shortest direct flight path.

关键词： Path optimization grid method Puffing process Dijkstra algorithm

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Obstacle Avoidance Optimization of Joint Robot Based on Partial PSO Algorithm

Obstacle Avoidance Optimization of Joint Robot Based on Part...

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The 2011 International Conference on Materials Engineering for Advanced Technologies(ICMEAT 2011)

作者： Junwei ZHAO Yanqin LI Guoqiang CHEN School of Mechanical ＆ Power Engineering Henan Polytechnic University

Aiming at the joint robot path plan in unknown environment, the paper adopts the method of obstacle avoidance in X-Y planeThe obstacles exist in the Cartesian space are transformed into the joint blind regions in the Joint（C） space through geometry principle and inverse kinematicsThe simulation using the partial particle swarm optimization（PSO） algorithm is utilized in seeking the angles that can avoid obstaclesFinally the path in the Cartesian space is obtained through transforming anglesThe method is verified to be simple and effective.

关键词： joint robot obstacle avoidance grid method partial PSO algorithm.

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