Tool path planning and geometry simulation for multi axis CNC belt grinding

Belt grinding machine with multi axis computer number control(CNC) system can effectively process parts with complex moulding surfaces.In this paper,iso parametric and iso planar tool path planning strategies customized for this kind of machine are proposed.The tool path generation methods are designed based on the analysis of the belt grinding process.By using least square method,optimized cross section normal is computed in the iso planar method.To improve the design efficiency of path planning,reduce experiments and increase economical benefit,the geometric simulation program based on linear grinding model is developed.Experiment on a turbine blade profile shows that the proposed algorithms work satisfyingly.     

MYOELECTRICAL ROBOTIC SYSTEM FOR REHABILITATION PATIENTS WITH RESTRICTED MOVEMENT

This paper presents a robotic system for the rehabilitation of moving functions of the human body. It also shows that it is possible to apply the myoelectrical signal for correction of velocity of executive mechanisms movement. The myoelectrical signal contains information about muscle function and fatigue during the operation of the robotic system. The results of the simulation are described for. the robotic system which consists of two planar executive mechanisms. This robotic system is used for the training of the human hands.     

Key Links and Solutions for the Relationshipsabout Reconstruction of Old Buildings

Following the rapid development of the revolutions in housing system,reconstruction of old buildings is rising.In order to make the reconstruction proceed smoothly,in this paper the author studies the secondary parts,reinforcing foundation,dismantlement of some parts of an old building,linkage of new and old frames,solutions for the four relationships,and others.     

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.     

About the Synthesis Method of Planar Multilink Mechanisms Based on Genetic Algorithm

This paper discusses the method of synthesizing planar multilink mechanisms based on GA. The pivotal technology is coding, creating population, account fitness, genetic operation and defining population size. This method does not require initial mechanisms and can search for plural appropriate mechanisms simultaneously. It is efficient about the non-linear problem. As an example, configuration of 4-bar planar mechanisms is decided in a practical application. It can be used the synthesis of 6-bar or more bar planar mechanisms as well.     

由博返约：乡村文化现代性重塑的现实路径

在搭建乡村振兴战略视野下的文化转型理论框架基础上,进行乡村文化现代性重塑问题分析,探索乡村文化的现代性重塑路径。通过分析乡村文化现代性重塑的内在契合逻辑,分析乡村文化现代性重塑的必要性和紧迫性,按照明晰主体、确定目标、探索路径的逻辑思路,建立起符合中国国情且具有操作性的意识形态共识、制度安排、政策实施和治理运行的乡村文化自信重塑策略体系;明确“现代乡民”是乡村文化重塑的主体,通过增强文化认同、培育“现代乡民”、文化创新与文化整合并重等方式,达成文化自信。     

古莲花池的造园特点及其复建

古莲池对于中国古典园林的研究具有重要的意义。文章简要介绍古莲池的发展历程,重点从规划布局、理水手法、建筑营制几个方面分析古莲池的造园特点,以及人们对其复建后产生的一些争议。     

Synthesis of planar 2T1R non overconstrained parallel mechanisms

Based upon screw theory and set theory, and according to the constraint system between mobile platforms and limbs, the structural conditions of non overconstrained planar 2T1R parallel mechanisms are proposed. Six types of limb constraint patterns are fou     

Research and Development a Visualization System for Medical CT Images

In order to develop a 3D visualization system for medical CT images which comply with DICOM standard, the authors study DICOM file format and methods of analyzing it, discuss the key technology of adjusting Windows Center/Windows Level of Medical CT images and 3D visualization methods, and describe the system's structure and approaches to implement every function module. Through developing 3D reconstruction software of medical CT images, surface rendering is compared with volume rendering.We succeed in implementing the visualization system for medical CT images which comply with DICOM standard. This system provides an intuitionistic way for diagnosing with medical images. The system is significant in clinical environment.     

Nonlinear Analysis Technique of Refined Plastic-hinge Method for Steel Frame Structures

The refined plastic-hinge method is one of the simplified advanced analysis methods. The second order effects of the whole structure and its members, geometric imperfections and residual stress as well as the feature of semi-rigid connections can be taken into account in this method. The refined plastic-hinge method can be used in advanced analysis and design of planar steel frames, while its use in the advanced analysis of space frames needs to be developed. The technique associated with the dealing of different inelastic factors in advanced analysis of both the planar and space steel frames with practical refined plastic-hinge method and the available way to extend planar frame analysis to space frame analysis are reviewed in detail. The problems of the refined plastic-hinge method for advanced analysis are discussed in this paper.     

Meshing performance analysis of planar internal gear enveloping crown worm driving

A new worm driving,i.e. planar internal gear enveloping crown worm driving,is presented. Its mathematical model of meshing functions and teeth surface equations are established basing on the theory of differential geometry and gear mesh. Various types of the driving,the macroscopic meshing performance and the microcosmic meshing performance are analyzed. The results show that the inclination angle of generating plane determines the distribution of contact lines,the planar internal gear primary-enveloping crown worm driving has ideal lubrication property,and the planar internal gear second-enveloping crown worm driving has high loading capacity. The studies are practicably instructive for developing new worm driving with high loading capacity,ideal lubrication and small volume.     

Research on the Relation between Motives and Performance of Reconstruction of Listed Companies in China

More and more reconstruction events happened in China, it becomes a hot point. Lots of literatures are about reconstruction theory, reconstruction motives, reconstruction modes, reconstruction performance, but no one is a bout the relation between reconstruction motives and its performance. This paper takes those companies in Shenzhen Exchange reconstructed in 1999 as study samples, groups them on its reconstruction motive and analyzes their reconstruction performance by financial data before and after reconstruction. It is pointed out that the relation between reconstruction motives and performance.     

Optimizing Design of Planar Transformers Based on Integrated Software Platform

A method of optimizing planar transformers' design based on integrated software platform iSIGHT is presented.Through integrating the circuit simulation tool Saber and Maxwell 3D to the optimization tool iSIGHT,the parasitic effects on planar transformers are studied carefully.Changing the thickness of the insulator layer between the primary and the secondary can obtain different values of parasitic parameters and a new method to avoid parasitic oscillations with dangerous high voltage spikes to improve the SMPS performance is established.Hence an optimal design of planar transformer is obtained.The final optimal simulation analysis results verify the correctness of above theoretical study.     

Synthetic Application for Analysis Methods of the Planar Mechanism Overconstraints

Overconstraints exist widely in planar closed chain mechanisms and mechanical systems result in a series of detrimental influences on behavior of machines, and attention is given to them by machine designer. Some analysis methods of overconstraints in planar closed chain mechanisms are presented, and more study due to the faultiness of these methods. In accordance with faultiness of two common kind of methods, formulas method and loop analysis method of degrees of freedom, and by combining these two methods, an useful mechanism overconstraints analysis method which is convenient for computer aided overconstraints analysis is gained via research on the two methods thoroughly and systematically, and some new views about mechanism overconstraints analysis are presented.     

新农村建设及其模式选择——基于3个典型自然村的调查分析

对山西省太谷县的3个典型自然村进行分析,其中郝村属于农业部在山西省确立的惟一新农村建设示范村,小王堡村和董村是省、市政府确定的典型的新农村建设试点村,他们在新农村建设模式的选择方面,都立足地方经济,发挥区域优势,彰显自身特色,以发展现代农业为核心,在引领新农村建设方面,具有重要的示范意义和推广价值。     

Analysis of elastohydrodynamic lubrication of steel planar wormgear drive

Based on study of elastohydrodynamic lubrication (EHD) and meshing theory of planar worm gear drive, EHD model for the drive is proposed. Minimum film thickness on the whole contact area is calculated. EHD status for the drive is analyzed. The distributions of film thickness show that, EHD status during entry engagement is better than that during exit engagement, and EHD status of worm addendum area is better than that of dedendum area. Influencing factors such as work conditions and optimized parameters along with their effects were analyzed. Theoretical analysis suggests that the optimizing pressure angle and increasing worm pitch diameter have influence on improving lubricant performance of the planar worm gear drive.     

The Signals Analysis System Based on Fast Wavelet Transform

The fast wavelet transform (FWT) algorithm in wavelet analysis was introduced in the paper. With quadrature mirror filters (QMF) associated with popular wavelet bases, the fast wavelet decomposition and reconstruction for signals were implemented. Combined with virtual instrument technique, the FWT analysis system for signals was successfully developed. The system can break up signal not only into approximations, which are the high-scale and low-frequency components of the signal, but also into details which are the low-scale and high-frequency components. Especially it can identify singularity signal, which contain some important message of equipment condition and fault, and refine signal from noisy signal, which is corrupted by noise.     

Dynamic Protection Planning and Industrial Upgrading of Shengjinta Historic Block in Nanchang City,Jiangxi Province

Starting with cultural context of historic block, this paper investigated current situation of Shengjinta Historic Block in Nanchang City, Jiangxi Province, proposed dynamic protection planning and sustainable industrial upgrading strategies, specifically, by repairing, clearing, preserving and restoring historic streets and lanes, courtyards and folk dwel ings from six perspectives of planar layout, traffic pattern, spatial texture, facade decoration, landscape planning, and characteristic culture. In view of the specifi c geographical location, food shops and leisure green spaces are constructed to build a modern urban living system for residents in the ancient block.     

A Class of Planar 5 - Body Central Configurations

Newtonian n-body problem is an old, complicated problem. It is very significant to study it. Even about three problem, the completed solutions have not obtained so far. It is one hottest point studied in n-body problem. Based on some hypothesis of symmetric conditions, some necessary and sufficient conditions have been obtained with the purely algebra method. The classification of planar 5 - body central configurations is discussed , in which three class planar 5 -body central configurations are obtained.     

Analysis of Urban Reconstruction Based on Game Theory

The management of urban reconstruction is a process of game between the government and developers.It is helpful that the interest and its equilibrium for the relative parties involved in the reconstruction process are considered during the formation of government policy.This paper analyzes the environment for the policy constitution and establishes a model for strategy making based on the game theory.This model provides a basic foundation to improve the management ability of the government in the reconstruction process.Finally,in this paper some strategic issues are suggested to cope with the challenges from urban reconstruction in China.