A Simplified Thermoelastic Model for Composite Iaminated Shells

To effectively analyze the one way coupled thermoelastic problem for composite laminated shells, a simplified thermoelastic shell model based on the variational asymptotic method (VAM) was developed. The 3 D energy functional for composite laminated shell was established according to the Hamilton extended principle. Then the 3 D energy was asymptotic expanded into a series of 2 D approximation energies by taking advantage of the inherent small parameters. Finally, the approximate energy was converted to the form of Reissner Mindlin model, and the 3 D recovery relationships were deduced to accurately predict the 3 D field distribution along the thickness direction. The cylindrical bending example of a four layer composite laminated shells under the sinusoidal surface load and temperature field shows that the modeling speed is fast (equivalent single layer model, which can reduce two or three order calculations compared to the 3 D finite element method), and the nonlinear approximation ability is excellent (convergent to the exact solution).     

Surface Reconstruction and Application Based on Shape Constraints

On the base of the fairing of free-form surface reconstruction from 3D data points, this paper probes one method based on shape constraints. By making physical model as objective function and using geometric constraints, free form surface reconstruction is realized based on the idea of energy optimization. This method is not only beneficial to the connection of the reconstruction surface and CAD/CAM system, but also to the integration of design, manufacturing and inspection.     

The Research and Development of the Pilger''s CARD and 3D Modeling

The paper expatiates the principle of the pilger mill roll groove. A math model for optimization is set up based on various factors concerning the roll groove including the deformation theory, design process and selection of the parameters, etc. Meanwhile, the CARD techniques are combined. As a result, a software for the roll groove optimization is developed that provides such functions as groove data management, groove profile plotting and groove data printing, being a basis for relevant technological decision and groove optimization. Meanwhile, the principle and realization of complex curves are discussed. The 3D modeling is achieved by the exchange of data that is based on the CARD system.     

Research & Operation on Mathematical Methods used in NC System of Profile followed Grinding Robot

Several mathematic methods used in the numerical control system of profile followed grinding robot are described. Cubic parametric Spline surface function is employed to fit the geometric model of the surface grinded with high precision. Improvement of the physics performance of blade is obtained by reconstructing the large size surface of turbine blade based on calculation geometry. Graphic linear transfer technique is provided to users with unique format of programming. Graphic non linear transfer technique is used to solve some more difficult problems successfully including transformation of the coordinates of comtrolled points in multicoordinates system, adjustment of the attitude of grinding head as well as realization of constant pressure grinding. All these mathematics methods are demonstrated feasible and efficient in actual practice and are valuable in developing large size surface grinding robots.     

Modeling and Simulation of the Doubly Fed Generatorwith the Matrix AC-AC Converter as an Exciter

According to the space vector modulation method of the AC DC AC converter,the switch control scheme of the matrix AC AC converter is deduced,and the model of a three phase matrix AC AC converter is constructed. According to the mathematic model of the doubly fed generator and the excitation control principle based on dynamical synchronous reference frame,the simulation model of the generator and excitation controller are established,then the modeling and simulation of the doubly fed generator system with the matrix AC AC converter as an exciter are implemented.The steady state and transient characteristics of the system are simulated,the harmonics of the EMF and stator?rotor current are researched.     

Non-nodal Connection Method for Plane Beam Elements

In reasonably modeling reinforced concrete structures with plane beam elements, the reinforcement and the concrete are regarded as different elements respectively, which would be joined together with the non-nodal connection method put forward under the principle of virtual work based on the displacement analysis at an arbitrary point in a plane beam element and according to the consistent condition of displacements. Then with that method, more problems of complex combination and connection can be conveniently and precisely simulated, such as reinforced members or members with changing sections in different construction phases. In the numeric crete beam and the strengthening effects on another reinforced concrete is verified and its convenience is demonstrated. examples, the displacement of a reinforced con- beam are analyzed, the feasibility of the method is verified and its convenience is demonstrated.     

Study on Adaptive Sampling and Mesh Generation of Free-form Surfaces Based on Coordinate Measuring Machine

Digitizing of free form surfaces is one of key technologies on the reconstruction of free form surfaces. It is important to know how to sample properly free form surfaces on CMM, which concerns the reconstruction accuracy of free form surfaces and measuring efficiency. The mathematical model of sampling algorithm is proposed based on the concept of the center of gravity. Using the method, the topological information of surfaces can be preserved, and sampling mesh can be self organized. By analyzing and dealing with mesh data received from sampling algorithm, one approach with brevity and higher efficiency is provided on CMM.     

Spiritual Language of Public Art in Architectural Form

To interpret spiritual language of architectural public art, architectural form was analyzed. Visual art space is based on spatial vision, artistic forms of point, line, surface and body are major visual elements of spatial form. Visual elements can be demonstrated in various forms, and even more diversified in the context of spatial design, interact with each other according to the form principle of beauty, and construct artistic forms of the space. Manifestation of the nature of public art also relies on visual elements, and the public aesthetic experience and feelings about architectural public art are expressed by visual elements.     

空气负（氧）离子研究的知识图谱

归纳空气负（氧）离子研究进展和前沿热点,旨在为未来研究提供参考。基于Web of Science核心数据库以“air negative oxygen ion”为检索对象,获取2002—2019年收录的空气负（氧）离子文献,并通过知识图谱展现18年间其发展历程。结果表明,2002—2019年Web of Science数据库共收录相关文献285篇,文献发表数量年平均增长率为7.08%,合作指数为4.54,期间出现了许多高产论文作者和高被引论文,期刊影响因子高和被引频次高的文献更容易被其他作者引用。空气负（氧）离子文章来源期刊的大类学科以物理、工程技术和化学等学科为主,其中在《Journal of Physics D: Applied Physics》期刊上发表数量最多,总计12篇。空气负（氧）离子文章相关高频关键词主要为氧、空气、性能、氮、放电和等离子体等,等离子体、电池、石墨烯等新能源、新材料的应用则是近年来该领域研究的热点。中国作者发文量、文章被引用量、中外合作发表文章数量较高,但文章篇均被引用量较低。中外作者在该领域研究方向上存在差异,国内以空气负（氧）离子与森林康养、环境因子的关系为主,国外以空气负（氧）离子在化学、工业、医疗方面的应用为主。     

A concentration and diffusion model of particulate pollutants in transition room environments

We developed an integral concentration and diffusion model based on the aerosol theory. We studied the representation method and actualization process for pollution substances under stable and unstable status using the integral concentration model. We studied modeling and computing processes based on reflecting and absorbing barriers using the diffusion model. The model we developed can improve understanding of the change and distribution rules of inner pollution particles in transition rooms. Moreover, it provides a reference for environmental quality control and evaluation, and trouble free operation of the laser experimental system.     

基于原生境的景观温室多肉植物区设计模式研究

通过对中国现有8座典型景观温室的考察发现,景观温室多肉植物区以美学为原理的设计存在一些问题,具体表现为景观特色不突出、景观体验不丰富等。针对这些问题,提出了遵循植物原生境的设计方法,即在设计中模仿多肉植物原生境典型的地形地貌、基质、色彩、植物等特征,据此提出景观温室多肉植物区的生境主题设计模式,旨在为后期景观温室多肉植物区的创新设计提供参考。     

Dynamic Modeling and Analysis for a Humanoid Robot

To resolve the kinematics modeling and dynamics modeling of a humanoid robot with complicated machine, a modeling method based on the conventional mechanism combined with neural network is presented. First the kinematics formulas are deduced by analyzing its geometry structure. Second, the dynamics models are built up with Lagrange-Euler method combined with the define of interactive force among all parts of the humanoid robot. The interactive force is realized by neural network method. Finally, the true robot parameters are applied to the model. The simulation results show the validity of the modeling. So, the method is practical and available.     

Design Process Simulation Based On Information Dependency

A modeling method based on DSM is introduced. In circumstance of iterative task, the ways concerning about the input of data,the generation of stochastic variables and the set of the simulation clock are dipicted. While considering the learning curve of activities, the way is studied express the movable process of a single project and then list the corresponding Monte Carlo simulative block diagram .The program based of EXCEL VBA is also written. The result of a given simulative example shows that the method can simulate complex design activities and plan the project in terms of scientific basis.     

The Modeling of Decision Making Mapping Models for Manufacturing by the Fractal Theory

Based on the fundamental principle of the fractal theory, the fractal characteristics of the decision making mapping model for manufacturing and its modeling process are discussed. The principle of modeling for defcision-making mapping models by the fractal theory is proposed.     

基于Kano-QFD模型的家庭阳台微型水培装置设计

家庭阳台水培以观赏性强、整洁方便、绿色安全等特点拥有广阔的市场前景,以家庭阳台水培为设计目的、以用户需求为导向的家庭水培装置能够有效满足当前的市场需求。行为地图法与Kano模型的结合能够准确收集用户需求及重要度,QFD质量屋模型可将产品质量要素按照用户需求重要程度进行排序。据此进行方案优化,指导完成以用户需求为导向的装置设计。装置具有空间集约、造型美观、便于移动及固定、有效减轻水培液浪费污染、电线收纳便捷等优点,更适用于家庭水培。同时,新材料应用等也将成为装置未来提升的方向。     

Parameter Design for the Power Train and Simulation of the Dynamic Performance of Elctrical Vehicle

The method and principle of the parameter design for the power train of EV is explored and discussed,then the parametersof EV. based on SC7101 are reasonably selected.The method of calculating the SOC of Lead_acid battery is provided and the relation among the electromotive force,the interior resistance, the polarized resistance and the SOC are analyzed. The capacity is compensated according to the relation between the capacity and the temperature, which is the basis on which the energy management system is designed and improved. The dynamic model which reflects the dynamic characteristics of the power train is established,then the dynamic performance of the EV based on SC7101 is simulated, and the factors that affect the continuous mileage of EV are analyzed,the measures to increase the continuous mileage are provided.The result shows that the analysis of the electric characteristics of battery and the dynamic model are correct,and the dynamic performance perfectly meets the need of the design target.     

Optimal Design of Plane Cascades Based on Wavelet Theory

Based on the optimal control theory and Lagrange interpolation an optimal design model of plane cascades of 3D blade in an arbitrary surface of revolution is established. Using wavelet theory to solve the model, and lots of numerical results are obtained. The results show that the wavelet method is more effective than the conventional methods.     

基于无人机多光谱的华北平原花铃期棉花叶片SPAD建模方法研究

华北平原地区棉花叶片SPAD光谱特征有待探明,其最适宜建模方法亦有待研究。笔者针对华北平原棉区,基于无人机多光谱探索其叶片SPAD光谱特征和最佳建模方法。以德州市夏津县大李庄棉区为研究区,利用无人机获取棉花花铃期的多光谱图像,同步测定棉花叶片SPAD值;对原始光谱进行预处理并组合构建光谱指数,进而采用相关分析筛选出6个棉花SPAD特征光谱指数;分别采用BP神经网络(BPNN)、多元逐步回归(MSR)和支持向量机(SVM)方法构建棉花SPAD值定量分析模型,并对模型验证、对比,优选最佳模型和建模方法,进而定量分析研究区棉花叶片SPAD空间分布。结果表明:棉花叶片SPAD的特征波段为红光和红边波段;入选模型的特征光谱指数为r、r*reg、(reg-r)/(reg+r)、r-g、r/g、$\sqrt{r^{2}+g^{2}}$;对比3种建模方法,BPNN模型精度最高,其建模集R²、RMSE分别为0.747、4.568,验证集R²、RMSE、RPD分别为0.758、4.142、2.135,确定为棉花叶片SPAD的最佳模型。基于BP神经网络模型进行棉花叶片SPAD的空间分布反演,反演值与实测值具有高度一致性,拟合结果较好。BP神经网络可以作为基于无人机多光谱的华北平原棉花叶片SPAD建模的优选方法,该研究可促进棉田定量遥感和棉花长势监测。     

Designing an experiment with quantitative treatment factors to study the effects of climate change

Experiments for studying the effects of climatic change on ecosystems often involve manipulation of one or several quantitative treatment factors of interest. Response surface regression is the method of choice for these types of experiment. Here, we describe the development of a design of a free air CO₂ enrichment experiment with two quantitative treatment factors, that is, elevated temperature and CO₂ enrichment. The design strategy takes account of budget constraints imposing limitations on the number of plots with elevated temperature and CO₂ levels. The approach is based on polynomial regression models and is focussed on an efficient estimation of interaction between the two treatment factors. Extension to more than two factors is straightforward. An analysis of soil moisture data demonstrates the overall suitability of the proposed design to analyse non‐linear interactions of two (or more) global change factors.