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31 December 2016, Volume 37 Issue 6 Previous Issue    Next Issue

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Graphics and Geometry He Yuanjun 2016, 37(6): 741.  DOI: 10.11996/JG.j.2095-302X.2016060741 Abstract ( 196 )   PDF (1237KB) ( 268 )   The relationships between graphics and geometry are discussed in this paper. From the view that shape is the source of the graph, the drawing/image are fundamentally constructed by geometric elements, thus the process of generation, representation, processing and propagation of drawing/image could be regarded as some operations of definition, transformation and interrelation of geometric elements. Therefore, it can be concluded that geometry is the basis of graphics and its theory, and meanwhile geometric computing is also the basis of graphics computing. Then, based on the analysis of graphics and its computing fundamentally, the essence, contradiction and key technologies of graphics computing are presented. The respective roles and advantages/disadvantages of algebra and geometry, emphasizing the leading status of human in the design of algorithms are also discussed. Moreover, the generation of a drawing or a model depends more on the relations between their elements than the elements themselves. Since the drawing/images have become the major objects and representation in graphics computing, a geometry-based shape calculation mechanism is introduced to fix the shortage of normal numerical calculation mechanism, so as to pursuit a new mode of geometric computing as thinking by shape while computing by number. Related Articles | Metrics

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3D Model Retrieval Based on CGS and Genetic Algorithm Bai Liu1, Song Chaochao2 2016, 37(6): 754.  DOI: 10.11996/JG.j.2095-302X.2016060754 Abstract ( 113 )   PDF (1115KB) ( 255 )   The voxels structure principle of 3D model as the foundation, expounds the voxel geometry information and body elements of topological relations and benchmark problems, establish the 3D model feature extraction function and of its rotation, translation and size changes of classic moment invariant processing, put forward a based on voxel structure and genetic algorithm of 3D model retrieval method. This method reduces the convergence speed of the search area and improves the retrieval accuracy and retrieval speed by the genetic information encoding, the genetic information in the iteration and the variation of the genetic information. Related Articles | Metrics

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Research on the Innovation Method of Ergonomic Products Based on E/HOQ/TRIZ Zhang Fanglan, Shi Huijun, Chen Guoqiang 2016, 37(6): 759.  DOI: 10.11996/JG.j.2095-302X.2016060759 Abstract ( 80 )   PDF (2645KB) ( 237 )   To fast and accurate ergonomic product design at the design stage, the E/HOQ/TRIZ integration model is developed and the specific steps are described. The method of obtaining user needs based on the ergonomics (E) user needs three-dimensional classification was described. The key issues and the key design areas of ergonomic design were established by the house of quality (HOQ). The type of conflicts of the key issues were analyzed and resolved by the theory of inventive problem solving (TRIZ) for achieving ergonomic product innovation. E/HOQ/TRIZ integration model can effectively make up the limitations of the single design theory and method, and play the advantages of the three theories and methods, so as to realize the innovative design of human machine products. Finally, through innovative design of the ergonomic bath facilities, the feasibility of the proposed integrated model and approach was demonstrated. Related Articles | Metrics

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Research on Emotional Forecast Method of the Mobile Terminal User Interaction Behavior Ping Zhengqiang, Lü Jian, Pan Weijie, Liu Zhenghong 2016, 37(6): 765.  DOI: 10.11996/JG.j.2095-302X.2016060765 Abstract ( 98 )   PDF (4997KB) ( 305 )   User’s emotional experience in the design of interaction is related to the success of the design, the study of user’s emotion has been the research focus in the interaction design. People with mobile terminals produces emotion in the process of interactive behavior. Because of the emotion of subjectivity, it is difficult to measure objectively. This paper proposes a method predicting the emotion with eyes’ movement indices, choosing Chinese PAD emotional scales as the tool of emotional measurement, by partial least squares regression analysis to establish the eyes’ movement indices and PAD the emotional value of multivariate linear regression model, then carry on the experiment design, whether the the mapping function relation can accurately predict the emotion, the experimental results proved that the relational expression can accurately forecast emotion. Related Articles | Metrics

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Model Construction of Multi-Dimensional Perception Information Based on Product Feature Deconstruction Fan Lingxiu, Pan Weijie, Liu Zhenghong, Lü Jian 2016, 37(6): 771.  DOI: 10.11996/JG.j.2095-302X.2016060771 Abstract ( 94 )   PDF (1313KB) ( 291 )   Because plenty of the existing one-dimensional KE models cannot express the users’ perception information of products comprehensively. The method of structuring multi-dimensional perception information based on product feature deconstruction was proposed. Structured Multi-dimensional feature space and emotional perceiving space by using the method of product shape deconstruction; combined the theory of similarity, MDS and the K-mean CA to quantify the image vocabularies and extract the typical emotional dimension; determined the main influence factors with PCA. Finally structured the KE model of multi-dimensional variables by multiple linear regression analysis method. Based on an example of the microwaves, proved the feasibility of this method, and the result indicated that this method was more effective to lead product design. Related Articles | Metrics

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A New Method for 3D Space Calibration Based on Planar Calibration Board Wang Xiangdong, Dong Qiqi 2016, 37(6): 778.  DOI: 10.11996/JG.j.2095-302X.2016060778 Abstract ( 136 )   PDF (10000KB) ( 216 )   This paper puts forward a new 3D space calibration method by using planar checkerboard lattice calibration in based on the existing problems for using three-dimensional frame camera calibration in the calibration range, error, portable and aging aspects. This study selected five meters, ten meters and 30 meters of the shooting distance. Calibration reference object used traditional 3D radiation type stereo frame and homemade two-dimensional planar checkerboard calibration plate, the standard meter length scale for 3D reconstruction. The accuracy comparison of two kinds of measurement results is carried out. In addition, the error distribution of the different position of the standard one meter in the measurement space (the middle and the edge of the measuring frame) is carried out. Experimental results showed that implemented in this paper based on planar checkerboard calibration plate camera calibration method had significant advantages, regardless of convenience and measurement accuracy this new method was better than three-dimensional framework and met the needs of scientific research of physical education. Related Articles | Metrics

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Un-Calibrated Single Visual Image of Orthogonal Vanishing Point Detection Algorithm Chu Jun, Xiao Xu, Liang Chen 2016, 37(6): 783.  DOI: 10.11996/JG.j.2095-302X.2016060783 Abstract ( 142 )   PDF (2030KB) ( 302 )   The traditional method can only calculate the orthogonal vanishing point of the calibration image, dose not take into account the error of straight line detection, the length of the straight line and the location relationship between the candidate vanishing point and the constrained line has the impact on the accuracy of the vanishing point detection. For such problems, this paper proposes an un-calibrated single visual image of orthogonal vanishing point detection algorithm. First, use J-Linkage algorithm to complete the initialization of the vanishing point estimates, and get the set of assumed vanishing points. Second, according to the consistency between the assumed vanishing points and lines, length of line segment to get the exact vertical vanishing point based on a voting mechanism. Third, calculate the parameters of the image camera by the nature and properties of the vanishing point and vanishing line. Then based of the orthogonal characteristics of the vanishing point to get the exact horizontal and depth direction of the vanishing point. By the introduction of a new consistency measurement method between the assumed vanishing point and the line of image, this method not only gets rid of the dependence on the camera parameters, but also reduces the impacts of the impacts of errors of line segment extraction, length of line segment as well as the relative position of vanishing point and the constrained line on the precision of vanishing points detection, in the case of unknown image camera parameters this method can get accurate information about the three orthogonal vanishing point. This method this thesis applied can achieve better results in indoor scenes. Related Articles | Metrics

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The Video Detection System for Wheel/Rail Vertical Relative Displacement Ma Zengqiang, Liu Xiaoyun, Zhong Sha 2016, 37(6): 799.  DOI: 10.11996/JG.j.2095-302X.2016060799 Abstract ( 140 )   PDF (1137KB) ( 223 )   Wheel/rail contact state is the basic content in analyzing safety of the train, and the relative displacement between wheel/rail is the most direct reflection of wheel/rail contact state. The current contact measurement based on sensor is widely used in dynamic performance parameters detection for monitoring locomotive status. However, it has several defects, such as being difficult to realize dynamic measurement and has poor anti-jamming capability. In order to overcome the defects above, the video monitoring system for wheel/rail relative vertical displacement is designed in this paper. In the system, camera and laser are installed on the bogie vertically. Since the camera, laser and bogie remain static each other, then the wheel/rail relative vertical displacement can be measured by the laser ordinate change in image. Finally, the experiments had been carried out under the two different conditions of ballastless track and ballast track. The results show that the system can acquire wheel/rail vertical relative displacement and has strong adaptability to the detection environment, and it has great important significance to further exploring and evaluating locomotive safety mechanics. Related Articles | Metrics

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A Novel Method for Fish-Eye Image Radial Distortion Correction Shi Ping 2016, 37(6): 805.  DOI: 10.11996/JG.j.2095-302X.2016060805 Abstract ( 114 )   PDF (1699KB) ( 262 )   Since the fish-eye camera has wide view field, it has been used widely in many fields. However, there is seriously radial distortion, needed to be corrected before any application. Fish-eye image geometric correction is a hot and difficult problem in current industrial applications and theoretical research. This paper presents a radial distortion model, and point out its analytical solution is not unique. According the symmetry of the radial distortion, reveals the relationship between a distortion curve and its ideal straight line, called the analytical expression of the curve distortion correction. Based on the previous analysis, this paper proposes a geometric correction method. Experiments show that this method is simple, can effectively corrects the scene which containing line features. Related Articles | Metrics

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The Research and Development of Rail Traffic Information System and Its Application in Guangzhou Metro Zhang Weizhong1, Wang Wei2, Chen Qian3, Liang Tao1, Zhang Rui2, Wang Hengwei3 2016, 37(6): 810.  DOI: 10.11996/JG.j.2095-302X.2016060810 Abstract ( 268 )   PDF (4023KB) ( 410 )   In order to satisfy the requirements of the construction management and the digital transfer of the new lines of Guangzhou Metro, Guangzhou Metro Group Co., Ltd. cooperates with Tsinghua University, and then advanced 4D construction management concept was first introduced to rail transit construction projects. We have studied a variety of mainstream modeling software compatibility and integration of information technology, and have established BIM-based rail transit 4D technology application architecture and information model structure by studying multi-platform information management model, which apply to the actual construction management of Hedong station of the posterior segment in Guang-Fo line. In addition, the system implements the electromechanical equipment information management process based on two-dimensional code, the “pressing the pin” quality and safety management based on 3D models, as well as the schedule management with the work order as the core. Meanwhile, to better promote the landing application system, we studied and complied the BIM standard application guidelines. The application of this system shows that the research contributes to the information sharing among project participants, multi-disciplinary collaboration, shorten the construction period and reduce operating costs, which greatly improve the efficiency through the process of the subway construction and the information management level. Related Articles | Metrics

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The Research of the BIM-Based Building Fire Safety Management Framework Chen Yuan, Ren Rong 2016, 37(6): 816.  DOI: 10.11996/JG.j.2095-302X.2016060816 Abstract ( 162 )   PDF (1182KB) ( 466 )   As the great development of urbanization in our country, fire disasters in cities have increased largely and the fire safety management becomes more difficulty. With the progress of building information modelling (BIM), the fire safety design and fire safety management have achieved new methods and ideas. This research has developed a BIM-based building fire safety management framework consisting of the BIM-based fire safety design model, BIM-based Fire emergence response plan management and BIM-based intelligent fire system. This framework has been evaluated in a real construction project and illustrated that the application of BIM can increase the efficiency and reliability for building fire safety management and provide technical and managerial supports for the fire safety management lifecycle. Related Articles | Metrics

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Research on the Information Model of Ancient Building Component Based on Revit Wang Ru, Zhu Xu, Huang Xin 2016, 37(6): 822.  DOI: 10.11996/JG.j.2095-302X.2016060822 Abstract ( 90 )   PDF (622KB) ( 293 )   Aiming at the problems of information management, information sharing, lack of information standards, this paper propose that the information model of ancient buildings could be set up to improve the management of information. Firstly, analyze the information of whole life cycle of ancient buildings, then standardize the information, finally, establish the ancient building components information model. Experiments show that the method greatly improves the efficiency of management and utilization of information. Related Articles | Metrics

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Based on BIM Building Engineering Drawing Teaching System Building Miao Dun 2016, 37(6): 826.  DOI: 10.11996/JG.j.2095-302X.2016060826 Abstract ( 181 )   PDF (2882KB) ( 287 )   With the advent of the era of construction building information modeling (BIM), with 3D modeling as the carrier of the design and drawing had greater influence on the traditional drawing education. Based on BIM modeling this paper discusses the architectural engineering drawing teaching new system build, break the monotony of complanation of drawing thinking, simulation in virtual space structures, vivid reduction design intent, to study and practice of engineering graphics and modeling process of unification, students out of the learning difficulties caused by a lack of space thinking ability, make them in the process of modeling experience design, creation and innovation. Related Articles | Metrics

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Design and Develop for the APP of Engineering Graphics Base on Android Qiu Longhui 2016, 37(6): 831.  DOI: 10.11996/JG.j.2095-302X.2016060831 Abstract ( 85 )   PDF (5751KB) ( 263 )   The design for APP of engineering graphics is discussed, for the teaching needs to develop of spatial imagination ability of undergraduate. Base on the needs of teaching and study, the functions are made sure that aided teaching and assisted learning of system, and the basic function of software is designed. The frame structure of software is designed. The comparison of the mobile device system platform, choose development and operation platform of the system. Through the analysis of interface of Android framework, the orthographic view is designed. Through the analysis of and data needs of the glDrawElements, and VRML97 data format, the VRML loader is designed. The 3D browser of VRML model is designed on the Android system. And the core function of software is developed. The APP of engineering graphics is realized based on Android platform. The software has characteristic of innovation and practicability, and get the first prize in the 14th national multimedia courseware contest. Related Articles | Metrics

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Development of Web Virtual Model Library of Engineering Drawing Based on WebGL Li Xingtian, Zhang Liping 2016, 37(6): 836.  DOI: 10.11996/JG.j.2095-302X.2016060836 Abstract ( 102 )   PDF (3101KB) ( 387 )   The composite solids in Engineering Drawing are modelled by using AutoCAD. Based on the exported files in the STL format for the models and WebGL, the data files for the models are read and parsed, a shading program and an interactive processing program for mouse event are developed, and a web virtual model library of solids for engineering drawing, which can be run in browsers is established. The library has a large number of models and a friendly graphical user interface. When installed on a server, the library can be accessed on client terminals, which facilitates classroom teaching and is helpful to spatial imagination ability of students, improve their study efficiency and provide reference for the development of other virtual model library. Related Articles | Metrics

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Reform and Practice on General Training of Engineering Skills in Agricultural#br# Colleges——A Case Study of South China Agricultural University Chen Haibo1, Zhou Shihua2, Tao Ye1, Zheng Dingke1 2016, 37(6): 842.  DOI: 10.11996/JG.j.2095-302X.2016060842 Abstract ( 100 )   PDF (282KB) ( 191 )   General education is not only a concept of university education, but also a model of talent cultivation. As a university-wide general education course, engineering skills training is an important way to cultivate students’ engineering awareness and improve students’ engineering quality. Based on the teaching reform and practice of engineering skills training in South China Agricultural University, this paper focused on the teaching of engineering skills training in agricultural colleges. By analyzing the problems existed in teaching elements of this course, such as teaching goal, teaching content, teaching mode and teaching conditions, some reform directions and measures were put forward on the basis of the requirement of talents training in agricultural colleges in twenty-first century. Besides, the effect and achievements of the new teaching method were summarized, for the purpose of establishing a kind of teaching mode of engineering skill general training which is suitable for the agricultural colleges, and has the characteristics of the times. Related Articles | Metrics

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Constructional Design and Practice of Blended Learning Mode for Course of Engineering Graphics Based on Information Technology Ruan Chunhong, Huang Qibo, Huang Jinguo, Zhang Li, Li Xiqiu 2016, 37(6): 846.  DOI: 10.11996/JG.j.2095-302X.2016060846 Abstract ( 83 )   PDF (415KB) ( 270 )   With the rapid development of information technology, it brings changes of how the classroom teaching organizes and presents. To improve the quality of classroom teaching, it was of great importance to do the research of how to take advantage of information technology and excellent education resources and reform teaching mode in top university. The key points of engineering graphics were analyzed, and according to its type and characteristics we designed the blended learning mode, then two rounds of practice were carried. Compared with conventional learning mode, blended learning approach achieved success not only in the accomplishment of the teaching program, but also in the improvement of the students’ learning efficiency and self-directed learning abilities. Related Articles | Metrics

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Research on the Test Paper Generating Method of Engineering Graphics Based on the Extension and Integration Mode Li Ruisen, Zhang Shuyou, Yi Guodong, Tan Jianrong 2016, 37(6): 851.  DOI: 10.11996/JG.j.2095-302X.2016060851 Abstract ( 75 )   PDF (879KB) ( 205 )   The engineering graphics test database has the features of diversified functional requirements, different majors and graphical exam content. A test paper generating method of engineering graphics based on the test database was presented to meet the requirement of engineering graphics examination and evaluation. This article established the architecture of test paper generating system, built an extendable test database, researched the test paper generating method of integration mode, and developed an engineering graphics test paper generating system. Related Articles | Metrics

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Mobile Learning System of Engineering Graphics Based on VR Technology Liu Wei, Du Qiang, Zhang Shunxin, Zhang Jianjun 2016, 37(6): 857.  DOI: 10.11996/JG.j.2095-302X.2016060857 Abstract ( 120 )   PDF (4668KB) ( 343 )   In the perspective of the cognitive process and the demand of diverse learning needs in the future, this paper presents a mobile learning system of engineering graphics based on the android platform and describes the main program of underlying structure, function and technology solutions. The mobile learning system of engineering graphics is designed based on virtual reality (VR), which is combined with JPCT-AE 3D engine, 3DsMAX and OpenGL ES 2.0 on the mobile terminals. In particular, according to the cognitive rules of engineering graphics course, this kind of application is characterized by split-screen function that displays multimedia and 3D virtual models at the same time. It also achieves interactive control of virtual models. Related Articles | Metrics

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Rolling Bearing Fault Feature Extraction Based on Improved Variational Mode Decomposition Gao Hongwei1, Zhang Lirong2, Hou Shaojie1 2016, 37(6): 862.  DOI: 10.11996/JG.j.2095-302X.2016060862 Abstract ( 111 )   PDF (1278KB) ( 218 )   In order to solve the problems that the fault feature of rolling bearing in early failure period is difficult to extract, a method for fault diagnosis of rolling bearings based on multi-correlation variational mode decomposition (MC-VMD) was presented. First, vibration signal is jointly acquired through multiple acceleration sensors and the multi-correlation process is made for the signal in order to prominent fault signal characteristics. Then VMD was used to decompose the fault signal into several intrinsic mode functions (IMFs), and then the IMF of biggest related kurtosis was analyzed by the spectral kurtosis and envelope demodulation. Finally identify the working status and fault type of rolling bearings through envelope spectrum. The proposed method was applied to actual signals. The results show that this method enables accurate diagnosis of rolling bearing fault, the analysis results demonstrated the effectiveness of the proposed method. Related Articles | Metrics