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31 August 2016, Volume 37 Issue 4 Previous Issue    Next Issue

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Zhao Xuetian’s Contribution to the Discipline Found of Chinese Graphics Liu Keming 2016, 37(4): 443-450.  DOI: 10.11996/JG.j.2095-302X.2016040443 Abstract ( 181 )   PDF (891KB) ( 264 )   The found of Discipline of Chinese graphics originated in the graphics education. Professor Zhao Xuetian devoted himself to the education and popularization of graphics knowledge. He will focus on formulas of mechanical drawing to the most fundamental projective geometry knowledge into some poetry. He organized the Hubei Province Drawing Society and national academic conference on graphics, set up in the China Engineering Graphics Society, and promoted the research of the history on Chinese graphics. This paper traces the institutionalization process of the discipline of Chinese graphics, and discusses Professor Zhao Xuetian’s contribution to Chinese graphics. Professor Zhao Xuetian is the founder of the discipline construction of Chinese graphics. Related Articles | Metrics

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A Real-Time Crater Rendering Method Based on GPU Zheng Guping, Xing Yue, Zhang Ronghua 2016, 37(4): 451-456.  DOI: 10.11996/JG.j.2095-302X.2016040451 Abstract ( 118 )   PDF (4075KB) ( 367 )   In order to solve the problem on high fidelity and real-time during the dynamic terrain rendering process, a real-time rendering method of dynamic terrain is proposed based on programmable GPU. First, the terrain hierarchy is constructed based on Geometry Clipmaps algorithm. Second, a dynamic terrain rendering method is introduced to achieve a more realistic effect on the final terrain based on real physical model and processing texture mapping during updating process. Finally, the crater effect formed on the lawn is simulated to verify the effectiveness of the method. And the proposed method is compared with the method based on ROAM on amount of drawing triangles, the average frame rate and CPU usage. The experiments results show that the proposed method can reduce the amount of drawing triangles effectively, and achieve higher frame rates and fidelity. The requirements of high fidelity and real-time in dynamic terrain rendering can be meted. Related Articles | Metrics

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A Kind of Trifocal Points Curve Gao Mantun, Li Yang, Wang Shuxia, Wang Shouxia 2016, 37(4): 457-466.  DOI: 10.11996/JG.j.2095-302X.2016040457 Abstract ( 73 )   PDF (2794KB) ( 232 )   A kind of trifocal points curve is mainly researched. Firstly, the concept and formula of this kind of trifocal points curve is presented, and the properties of the trifocal points curve are also analyzed. Secondly, quantitative and shape analysis is made on the trifocal points curve by turning its parameters, and the programming method is used to realize the shape analysis of the trifocal points curve. The properties and rules of the trifocal points curve are analyzed and summarized. Finally, the parameters of the trifocal points curve are calculated by using of the image processing and fitting method which is the contours of images of some objects. Moreover, the error analysis is given and the fitting curve is described. The experiment results show that the trifocal points curve can be the precise representation of the contours of the images of some natural objects. Related Articles | Metrics

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The Study on the Oval Equation Li Xiangjiang 2016, 37(4): 467-470.  DOI: 10.11996/JG.j.2095-302X.2016040467 Abstract ( 112 )   PDF (469KB) ( 300 )   Oval is a very common graphics in life, however it is not clearly defined in mathematics and engineering. It is still in the stage of circle and ellipse for studying the oval. In this paper, according to the descriptive definition of oval, a kind of cubic and standard equation is firstly given by mathematical analysis and derivation. A determining method is proposed whether a cubic equation is an oval equation or not, and the approach is given about how to calculate long, short and symmetry radius. To some extension, the proposed method can solve the problem about the oval without a mathematical expression. By analyzing the real images of an egg, the real parameter values of long, short and symmetry radius are obtained. These values are input to the oval equation, the graphics is drawn using computer program. Compared with the real images of eggs, the highly consistent results can be achieved. Related Articles | Metrics

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A Deterministic Algorithm for Solving the Problem of#br# Two-Dimensional Sheet Cutting Stock Zeng Zhaomin1, Wang Jihong2, Guan Weili3 2016, 37(4): 471-475.  DOI: 10.11996/JG.j.2095-302X.2016040471 Abstract ( 374 )   PDF (403KB) ( 623 )   This paper discusses the two dimensional sheet cutting stock problem, that is, use the least number of sheets to cut out a certain number of rectangular pieces. A deterministic algorithm is proposed which based on the combination of knapsack algorithm and linear programming algorithm. First, a knapsack algorithm is constructed to generates the four blocks uniform strip pattern, then the linear programming algorithm is used to generate the cutting plans which iteratively calls the above knapsack algorithm to improve the objective function based on the principle of minimum production cost and changes the current value of punched items to generate a new pattern according to the current value. Lastly, a set of optimal cutting patterns is selected to form the cutting scheme. The algorithm was compared with the famous T-shape algorithm using some benchmark problem tests. The results show that the algorithm can save more sheets than the T-shape one, and the calculation time is reasonable in practical application. Related Articles | Metrics

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Degree Reduction of Wang-Bézier Generalized Ball Curves Wang Yan1, Li Zhiming2 2016, 37(4): 476-482.  DOI: 10.11996/JG.j.2095-302X.2016040476 Abstract ( 81 )   PDF (317KB) ( 197 )   The degree reduction of generalized Ball curves of Wang-Bézier type is discussed by perturbation and the best uniform approximation respectively. The approximation error is given. The experimental results demonstrate that the effect of the best uniform approximation is better than that of perturbation. If the error cannot be obtained in advance, the original curve can be subdivide firstly, and then reduce the degree by using of perturbation part by part. The degree reduction method of WBGB curves enriches the theory system of generalized Ball curves effectively. Related Articles | Metrics

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Research on Geometric Comparison of 3D Models#br# Based on Geometric Registration Zhou Pei1, Liu Ming2, Wang Teng1, Yang Xin2, Nie Rongmei1 2016, 37(4): 483-490.  DOI: 10.11996/JG.j.2095-302X.2016040483 Abstract ( 95 )   PDF (1408KB) ( 326 )   In order to help designers to check model changes quickly in a collaborative design, this paper focuses on how to rapidly compare geometric differences between two 3D models. First, the equidistant point clouds of two models are computed, and then a reference coordinate system of each point cloud is obtained by using the principal component analysis method. A transformation is then found to match the two point clouds to achieve an initial registration. Finally, the ICP (iterative closest point) method is used to realize accurate registration for the two point clouds. By computing the non-overlapping domain after the exact registration, we obtain the geometric differences between the two point clouds. The numerical example shows that the proposed method can effectively recognize the geometric differences of two 3D models. Related Articles | Metrics

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Finite Element Simulation and Experiments of Acoustic Emission#br# Testing on the Side Frame of Train Bogie Zhang Jianchao1,2, Hao Rujiang3, Wu Zhe1 2016, 37(4): 491-495.  DOI: 10.11996/JG.j.2095-302X.2016040491 Abstract ( 93 )   PDF (3117KB) ( 196 )   The side frame is the key component of train bogie, and its fatigue property and crack state directly determines the operation security of locomotive vehicles. This paper starts with the typical locations where fatigue cracks easily appear in maintaining the side frame, thus the necessity of acoustic emission is proposed. The three-dimensional modeling method is combined with 3 kinds of finite element software (UG, HyperMesh and ANSYS/LS-DYNA), and the transmission characteristics of the acoustic emission signals in the side frame were simulated and visualized. Finally, the experimental program was proposed based on the simulation analysis, and the lead break testing system of the acoustic emission in the side frame was established. The application feasibility of the acoustic emission technique was tested on large railway components. Related Articles | Metrics

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A Hybrid Optimization Algorithm for Working Position Setting of#br# Assembling Robot Zeng Debiao1, Wan Shiming1, Li Yingguang2, Liu Yong1, Li Dongming1 2016, 37(4): 496-501.  DOI: 10.11996/JG.j.2095-302X.2016040496 Abstract ( 78 )   PDF (536KB) ( 220 )   In order to reduce production cost and increase productive efficiency, working positions of assembling robots need to be optimized to reduce the number of robots and the times of changing working positions. A hybrid optimization algorithm combining clustering algorithm and simulated annealing algorithm was proposed to optimize working positions of robots. Firstly, processing objects with common available working positions of robots were clustered by the clustering algorithm in order to reduce the scale of the problem. Then, a simulated annealing algorithm with multi-solution parallel search was employed to search for the minimum working positions of robots available for processing all objects. Testing results show that this algorithm is capable of improving optimization result significantly as well as accelerating the convergence of the algorithm remarkably. Related Articles | Metrics

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Simulation Analysis of Girder Hoisting Machine Based on Working Mode Chen Shitong1, Cui Chenguang2, Li Yiqiang1, Zhang Ping1 2016, 37(4): 502-508.  DOI: 10.11996/JG.j.2095-302X.2016040502 Abstract ( 79 )   PDF (1094KB) ( 254 )   The existing design and structure analysis of a girder hoisting machine refer to the design code in general, but the unfavorable factors, such as the running rail irregularity, running asynchronous, etc. are not considered in the process of design and structure analysis. These will even cause the safety accident. Aiming at solving the safety problem of girder hoisting machine, the five factors affecting structure safety are proposed based on the particular working condition, and three values are selected in each factor. In order to scientific arrange the combination of the five factors for structural safety assessment, the orthogonal design are introduced. The optimal combination scheme of the five factors are obtained by using of the L9(34) orthogonal table. A MG450 type girder hoisting machine was taken as example and the ANSYS was used to set up the element model. The comparative of analysis results based on the working mode and the traditional design method was carried out, and the effect of working mode was analyzed with experimental test. The analysis results of girder hoisting machine based on working mode is coincide with the engineering practice. Related Articles | Metrics

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Product Color Design Method Based on Color Case and#br# Grey Relational Analysis Yang Yanpu1, Chen Dengkai2, Gu Rong1, Yu Suihuai2 2016, 37(4): 509-513.  DOI: 10.11996/JG.j.2095-302X.2016040509 Abstract ( 100 )   PDF (1329KB) ( 193 )   To effectively aid industrial designers for product color design, a color design method was proposed by integrating color case and grey relational analysis. From target color image, product color specimens were selected, analyzed and screened. Color merging and trade-off analysis were researched as well as color case description method. For mapping color case to target product color design, target product was partitioned into several areas and grey relational analysis was used to evaluate the relevance between mapping product color scheme and color case. Scissor lift was taken as an example to verify that the proposed method can help transfer case color to target product color design effectively and offer satisfactory solution to customers. Related Articles | Metrics

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Visual Salience Calculation of Shape Feature for Human-Machine Interface Wang Ning, Yu Suihuai, Zhou Xian, Xiao Linzhen 2016, 37(4): 514-518.  DOI: 10.11996/JG.j.2095-302X.2016040514 Abstract ( 108 )   PDF (650KB) ( 223 )   Shape feature is an important element of visual ergonomics of human-machine interface. In order to improve the user experience and increase operation efficiency, a visual saliency calculation model for shape features of human-machine interface isproposed. The influence of shape features to visual saliency is analysed and several specific shapes are obtained which are used in huaman-machine interface frequently at first. The inscribed square is used to segment the shapes and some specific parts are got consequently. The triangle is related to the parts to calculate the parts’ visual saliency. The maximal value of parts’ visual saliency is taken as the visual saliency of the shape. An eye tracking experiment verifies the effectiveness of the proposed visual saliency calculation model. Related Articles | Metrics

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The Research on User Experience Design Strategies Based on#br# China’s Client Game Products Shi Huaxing, Dong Lijun 2016, 37(4): 519-523.  DOI: 10.11996/JG.j.2095-302X.2016040519 Abstract ( 92 )   PDF (7440KB) ( 87 )   In the era of experience economy, it is need to analyze the user experience design strategies in client games products to seek new design perspectives and for future traditional products design. By using literature research and case analysis, basing on the development of user experience design and relying on the methods and theory of product design, user experience design, interaction design, design psychology and emotional engineering system, it took client games products as the object to study its inherent user experience design strategies. A kind of user experience quantitative evaluation model is given, and the design strategies for improving the user experience of online games are proposed. The new inspirations and guidance are provided for the innovative design of traditional products. Related Articles | Metrics

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The Research on Brand Image for Automobile Styling Based on#br# Logistic Regression Ke Shanjun1, Wei Ying2, Cheng Zhenbo1 2016, 37(4): 524-529.  DOI: 10.11996/JG.j.2095-302X.2016040524 Abstract ( 107 )   PDF (6593KB) ( 215 )   Aiming at the need of brand identification in the process of automobile styling development, a method of brand image research is proposed based on logistic regression. Taking Hyundai as an example, the evaluation matrix of brand image is created by the survey of designers and consumers. Then, the mathematical model of logistic regression is created to analysis the modeling element characteristics and the modeling style characteristics. Finally, the validity of the conclusion is verified by testing other samples through consumers’ survey. Related Articles | Metrics

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Container Recognition and Location Technology Based on Feature Matching Chen Ning, Wang Sheng, Huang Zhengwen 2016, 37(4): 530-536.  DOI: 10.11996/JG.j.2095-302X.2016040530 Abstract ( 87 )   PDF (3009KB) ( 361 )   Container recognition and location is one of the key technologies to realize port automation. Template matching is one of the basic and frequently used image recognition methods. Traditional template matching algorithm only based on gray information of pixels to compare and match objects. When external environment changes slightly, the robustness of the algorithm is greatly reduced. Moreover, there are some problems, such as low matching efficiency and adaptability, etc. So, an algorithm was presented which combined with color template pre-position and image segmentation based variable step size block matching. The feature vector with shape invariance was extracted, which is an important basis of the container real-time recognition and location. The result shows that this recognition method not only improved image segmentation efficiency, but has great adaptability for target translation, rotation and scale change. Related Articles | Metrics

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Research on DTW Action Recognition Algorithm with Joint Weighting Wang Chengfeng1, Chen Hong1, Zhang Ruixuan2, Zhu Dehai1, Wang Qing1, Mei Shuli1 2016, 37(4): 537-544.  DOI: 10.11996/JG.j.2095-302X.2016040537 Abstract ( 171 )   PDF (801KB) ( 372 )   Human motions always contain only motions of some body parts, but much of the existing methods on action recognition don’t take the motion intensity of each joint into account, which lower the accuracy of action recognition in some extent. To solve this problem, an adaptive joint weighting scheme is proposed to calculate the weight of each joint and combined the weights with dynamic time warping (DTW) to recognize actions. Firstly, the action sequence was segmented into several segments and some most violent joints in each segment are assigned higher weight while the remaining joints are evenly weighted. Then feature vectors of two action sequences were extracted and the distance between two action sequences were calculated by DTW. Finally the action recognition was achieved by K-nearest neighbor method. The experiments showed that the overall classification accuracy of the proposed method is higher, and the result is also good for some similar actions. Related Articles | Metrics

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The Research on Interactive Courseware of 3D Simulation for Online Courses Gu Yanhua1, Zhu Yanping1, Yang Dejun2, Fu Heng1 2016, 37(4): 545-549.  DOI: 10.11996/JG.j.2095-302X.2016040545 Abstract ( 83 )   PDF (1302KB) ( 309 )   There is a great demand for interactive multimedia courseware for online courses. The CATIA is used to generate component models of mechanical products, and the assembling, disassembling and operating processes are simulated. The simulation animations are embedded into Flash programs to develop interactive courseware which can be controlled step-by-step by students on web. Another method is to import CATIA component models to 3DVIA Composer to create interactive animated courseware. Both methods are able to generate interactive online courseware that can be conveniently accessed and controlled by students to promote active and independent study. Related Articles | Metrics

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Virtual Simulation Experiment Development of Pipe Network Performance for#br# Air-Conditioning Duct System Teaching Sun Yuying, Ge Yijing, Wang Wei, Wu Xu, Hong Yang 2016, 37(4): 550-555.  DOI: 10.11996/JG.j.2095-302X.2016040550 Abstract ( 110 )   PDF (1096KB) ( 193 )   It is great significance to learn the theory of network performance for improving the design, adjustment and operation of air conditioning system. Aiming at the problem that the practical teaching of pipe network characteristics was hard to conduct for the limit of actual conditions, a simulation model of air conditioning system was built based on Dymola, and a virtual experiment simulation practical teaching platform was developed. A virtual simulation experiment was designed, and then a practice application case was showed. The results show that this virtual experiment simulation platform can be applicable to HVAC practical teaching, and it provides an intuitive, vivid, flexible method for the study of hydraulic and fan performance. It will be helpful to improve the teaching quality and students’ learning interest. Related Articles | Metrics

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The Application of BIM Technology in Yongchuan Changjiang Bridge#br# Construction Shi Ruiying1, He Hongbo2, Zhang Xianlin3 2016, 37(4): 556-560.  DOI: 10.11996/JG.j.2095-302X.2016040556 Abstract ( 108 )   PDF (3645KB) ( 327 )   Along with the domestic construction industry BIM technology is more and more widely used. Bridge engineering as a special building, also should enjoy the new mode of production of the improvement of production efficiency and economic benefit. The BIM technology application in the bridge construction process and created the value are analyzed by using of an example as in Chongqing Yongchuan Changjiang river highway bridge construction. The BIM technology is studied how to play a strong role in bridge engineering. Related Articles | Metrics

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Investigation of Multiple Evaluation System of Mechanical CAD Course#br# Based on OBE Li Jing, Niu Wenjie 2016, 37(4): 561-566.  DOI: 10.11996/JG.j.2095-302X.2016040561 Abstract ( 108 )   PDF (2011KB) ( 265 )   In order to promote students overall development, a new evaluation system is proposed about the mechanical CAD teaching in China University of Petroleum (East China). The new evaluation system with a multi-appraisal way can scientifically and overall assess students’ comprehensive quality. It is based on the outcome-based education (OBE) theory, composed of process evaluation, theoretical knowledge examination, assessments on practical and creative abilities. The evaluation continues through the whole course, which is good for students to construct the course knowledge and can stimulate the students’ enthusiasm and initiative. Besides, the evaluation system puts more emphasis on cultivating and assessing the students’ innovation consciousness and engineering practice ability. Related Articles | Metrics

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The Research and Practice of Effect-Oriented Teaching Model for#br# Graphics Internalization Capability Wang Min, Zhang Zongbo, Yi Peng, Lou Hui 2016, 37(4): 567-572.  DOI: 10.11996/JG.j.2095-302X.2016040567 Abstract ( 67 )   PDF (452KB) ( 218 )   Engineering graphics course has a profound impact for studying the follow courses and the ability of engineering practice and innovation culture of college students. However, the studying time of engineering graphics courses in colleges and universities is shorter generally. In teaching process, teacher pays more attention to the study of knowledge and training of skills, while the process is ignored to develop the graphics capability. To solve this problem, the theoretical framework of graphics awareness is proposed in this paper. Graphics knowledge and skill are repositioned and redesigned. A new teaching system is constructed combining with the teaching model and practice innovation. Through teaching practice, the graphics awareness of student is established, the graphics capability is internalized, and the practical ability and innovative quality are developed. Related Articles | Metrics

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The Improvement of Practice Teaching in Drawing Series Courses Wang Shuxia 2016, 37(4): 573-576.  DOI: 10.11996/JG.j.2095-302X.2016040573 Abstract ( 108 )   PDF (338KB) ( 296 )   Practice teaching is gradually becoming a reformation hot spot of teaching method in national university. But how to integrate the curriculum system and course groups with multi-dimensional practice teaching has not been deeply concerned. The existing problems are analyzed in the practice teaching of the drawing series courses. An innovative experiment platform for practice teaching reform is suggested. A multi-dimensional practice teaching is proposed by adding advanced computer-aided design technology into the curriculum teaching, participating in relative competition and certification test, opening elective courses, and so on. The teaching practice proves that the multi-dimensional practice teaching reform can stimulate students’ interest and improve the comprehensive quality. Related Articles | Metrics

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Comparison Analysis of Intensity for the Turbine Diaphragm Based on Wahl,#br# M-V and Finite Element Methods Yang Guanghui, Chen Qingbo 2016, 37(4): 577-581.  DOI: 10.11996/JG.j.2095-302X.2016040577 Abstract ( 63 )   PDF (1140KB) ( 211 )   Steam turbine can remain a safe production state for a long period under the environment of high temperature and high pressure if it has certain good strength and intensity. The methods of Wahl, M-V and finite element analysis were used in analysis of intensity for a subcritical state turbine diaphragm. The results showed that the maximum stress of the diaphragm appeared at the blade’s enter side of the blade root, the maximum strain appeared at the equatorial plane at an inner diameter of the inner ring, and the maximum stress of the board appeared at the inner diameter of the inner ring which was vertical to the equatorial plane. The errors of finite element method and Wahl method were smaller, so it proved the reliability of finite elements analysis. Related Articles | Metrics