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30 December 2017, Volume 38 Issue 6 Previous Issue    Next Issue

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Visualization Fault Diagnosis Method Based on Textural Features of Recurrence Plots WANG Xu, YUE Yingjuan, CAI Yanping, GUO Yayun 2017, 38(6): 797-803.  DOI: 10.11996/JG.j.2095-302X.2017060797 Abstract ( 129 )   PDF (4408KB) ( 274 )   Aiming at the difficulty of extracting the characteristic of vibration signal of internal combustion engine, internal combustion engine fault diagnosis problem is transformed into image recognition problem. A novel internal combustion engine visualization fault diagnosis method based on recurrence plots (RP) and improved local binary pattern (ILBP) is proposed. To characterize the internal combustion engine signal in different fault states, RP analysis method is used in the processing of the cylinder head vibration signal. Then the ILBPcoding method is used to extract the texture characteristics of internal combustion engine RP images. The ILBP coding gray orthogonal sequence of RP is used as characteristic parameters, and the support vector machine (SVM) is used to recognize the fault pattern recognition. Through the analysis of four different status of IC engine valve fault signal, a high fault recognition rate is arrived, which shows that this method has strong ability of fault feature description, which can be used for accurate diagnosis of IC engine valve fault. Related Articles | Metrics

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Digital Watermark Algorithm for Digital Videos Based on Eenergy Difference Method ZHANG Yanxi, MO Chunliu 2017, 38(6): 804-808.  DOI: 10.11996/JG.j.2095-302X.2017060804 Abstract ( 81 )   With the development and popularization of the Internet, the protection the copyright of digital media contents, especially the digital videos contents became a crucial research direction. In order to improve the robustness of the watermark, this research proposed an energy difference method to embed the digital watermark information into the video frames through DCT transformation of the video frame information. The videos embedding the watermark can be released as MP4, AVI, and WMV formats, and the analyzation of bit error rate and peak signal to noise ratio of the digital videos showed that this algorithm can resist digital image processing, including strong compression and various filtering. This study provides a new method for the copyright protection of digital videos. Related Articles | Metrics

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MATLAB Simulation Study on Dynamic Load Transfer Characteristics of Two Kinds of Threaded Connections SONG Yingyan1, ZHANG Jingying1, LI Xiaofeng2, CHENG Xiangqun1 2017, 38(6): 809-813.  DOI: 10.11996/JG.j.2095-302X.2017060809 Abstract ( 90 )   PDF (560KB) ( 166 )   The dynamic load transfer characteristics of two typical threaded connections under low speed impact are studied. Impact test of MIPS (muti-directional impact protection system) was completed to obtain impact and response signal of the system. The signal was analyzed in time domain and power spectrum analysis by MATLAB. The result shows that the damping effect of the structure A is larger than that of the structure B, and has a certain damping effect on the impact system. The resonance frequency of the structure B is obvious, and the resonance amplitude is high. It is not applicable to the impact structure. This difference has a guiding significance for the design of the connection structure. The functions of the signal transfer of the two structures were identified by the MATLAB function recognition tool. The transfer functions were optimized by appropriately increasing the number of zero/poles. The optimized functions were tested by experimental data, which showed that the optimization method can effectively improve the system fitness. The optimization method is of guiding significance for the design of other structural control systems. Related Articles | Metrics

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Study on Local Size in Functional Tolerancing and Its Alternative Annotation XU Xusong1, WU Dehui2, FAN Zhen1 2017, 38(6): 814-819.  DOI: 10.11996/JG.j.2095-302X.2017060814 Abstract ( 83 )   PDF (546KB) ( 245 )   In order to make better use of the definition local size for the design of mechanical tolerance under current tolerance standards. The concepts of local size in ASME Y14.5 and ISO/GPS were introduced. The differences in the use of local size in ASME Y14.5 and ISO/GPS were analyzed with the application of local size in an automatic feeding mechanism. The two tolerance standards differ in setting the local size, using tolerance principle and adding symbols to realize geometrical functions. Then, the geometrical specifications of the motor shaft were analyzed when using two-point measurement methods can’t detect the local size. The geometric tolerances items were used to replace the dimensioning of sector-cylinder to avoid the detection of local size. It is of positive significance to correctly understand the concept of the local size, relevant symbols and its detection characteristics, and to avoid ambiguous dimensioning, which can guarantee the functionality and assemblability of parts, and can improve the economy. Related Articles | Metrics

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Simulation of Fatigue Life of a V Diesel Engine Crankshaft FENG Guosheng1, SHANG Haikun2, HU Chunping2, LI Pengfei1 2017, 38(6): 814-819.  DOI: 10.11996/JG.j.2095-302X.2017060820 Abstract ( 66 )   PDF (1519KB) ( 143 )   In order to make the life prediction of the crankshaft strength and fatigue life when the maximum explosion pressure of a V diesel engine change from 15.5 MPa to 16.5 MPa. First we establish the dynamics model of engine in the ADAMS/engine based on engine model and parameters, and obtain the load time history data of the crank pin point, then we establish four cylinder ignition conditions finite element model of the first cylinder and the second cylinder when the maximum explosion pressure change from 15.5 MPa to 16.5 MPa. Then we calculate and get the each working condition fatigue life of the crankshaft according to the stress of all working conditions, the material s-n curve and the load time history curve. Calculation results show that the crankshaft maximum stress is less than the material fatigue limit in various operating conditions, and the stress concentration place mainly happens in the transition fillet of the connecting rod and journal, and the crankshaft life is over 1 000 hours in various working conditions. Related Articles | Metrics

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Research on Parametric Modeling Method of Stranded Wire Helical Torsion Spring HU Yechang, WEI Zhifang, WANG Zhiwei 2017, 38(6): 820-825.  DOI: 10.11996/JG.j.2095-302X.2017060826 Abstract ( 100 )   PDF (1102KB) ( 171 )   Stranded wire helical torsion spring is widely used in automatic weapons, there is still no standard parametric modeling method. According to the geometrical forming principle of stranded wire helical torsion spring, the functional relationship between the primary helix and the two helix is analyzed, and the three - dimensional parametric modeling method of torsion spring is studied. In the UG NX, using the dynamic expression modeling method, adopting “sweep”, “sketch” etc, a parametric template for two - column three - strand helical torsion spring is established. Parametric modeling is based on 81 and 56 7.62 mm rifle torsion spring parameters, and the feasibility of parametric modeling is verified. In the process of stranded wire helical torsion spring modeling, the standard naming is used to provide reference for all kinds of complex spring parametric modeling, and promote the three - dimensional parameterization process of complex model. Related Articles | Metrics

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Hybrid Level Set Image Segmentation Model Based on Variable Weights JI Ke, Yi Xuming 2017, 38(6): 831-836.  DOI: 10.11996/JG.j.2095-302X.2017060831 Abstract ( 91 )   PDF (6914KB) ( 212 )   In this paper, a new algorithm of image segmentation based on the combination of the local region and global region was proposed to solve the dependence of the initial contour on localizing region-based active contour (LRAC) model. The algorithm combine the characteristics of Chan-Vese model and LRAC model. When constructing the level set function, the variable weight parameters were defined to combine the local and global energy functional terms of the level set function. Further, the weight parameters were defined by image gradient and the mean of the inner and outer pixels at the local image. In addition, the narrow band method was used in the evolution of the level-set function to reduce the complexity of computation time. Experimental results show that our model has the advantages of both CV model and LRAC model. Compared with LRAC model, the method we proposed relies much less on the initial contour and has a better convergence rate. While compared with CV model, the precision of our model is higher in the effect of target edge segmentation. Related Articles | Metrics

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Image Encryption Based on Chaotic Map and DNA Sequence Operations GUO Yongning1,2, SUN Shuliang1,2 2017, 38(6): 837-842.  DOI: 10.11996/JG.j.2095-302X.2017060837 Abstract ( 125 )   PDF (506KB) ( 211 )   In this paper, a novel scheme for image encryption scheme is proposed, which is based on 2D-SIMM chaotic map and DNA sequence operations. 2D-SIMM chaotic map could generate larger chaotic ranges and better chaotic behaviors. The generated sequences are more suitable for image encryption. Extended Hamming distance is adopted and improved expanded XOR operation is proposed in this paper. DNA addition and subtraction rules are performed. Then the algorithm based on DNA complementary rule is presented. The experiments display that the proposed algorithm is available in security, availability and robustness. Related Articles | Metrics

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License Plate Location Algorithm Based on Adaptive Mathematical Morphology WANG Xiaoqun, LIU Hongzhi 2017, 38(6): 851-856.  DOI: 10.11996/JG.j.2095-302X.2017060843 Abstract ( 90 )   PDF (1248KB) ( 285 )   The basic process of vehicle license plate location includes pretreatment, the rough location and the accurately location of license plate. In the step of the rough location, the traditional license plate locating algorithm based on mathematical morphology, and the key to its success is the selection of the structural element. Generally, we use the same structural elements to determine the location of license plate. But there are some faults. An algorithm based on adaptive row and columns structure element of mathematical morphology is proposed. Under natural conditions, the location of license plate in vehicle image may be effected by the brightness or darkness. Based on this, the adaptive contrast enhancement algorithm is proposed in this paper which is applied in the image pretreatment stage. The results show that the algorithm is effective. In the step of precise positioning, this paper used method of region-labeling and the method of projection to locate the license plate accurately. We collect more than six hundred images in different time or place and experiment results show that the method is effective. Related Articles | Metrics

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Automated Pipe Defect Detection and Classification LI Hao, WANG Hongtao, DONG Qingqing 2017, 38(6): 851-856.  DOI: 10.11996/JG.j.2095-302X.2017060851 Abstract ( 96 )   PDF (1159KB) ( 354 )   In the fields of industry, nuclear facilities, oil and gas, pipe is commonly used as the means of material delivery. And it is easy to appear various defects. The traditional manual detection system has the disadvantages of low accuracy, low efficiency and high cost. The digital image processing technology can automatically detect and classify the pipe image, thus effectively overcoming the above shortcomings. First, image enhancement, image segmentation, mathematical morphology and boundary tracking are used for image preprocessing. Then, after extracting the size, shape and texture features of the defective area, we choose the circularity, convexity, eccentricity, entropy, correlation and cluster tendency as the feature vector. Finally, K-means clustering analysis based on particle swarm optimization and statistical pattern recognition classifier is used for classification. Using the image preprocessing algorithm in this paper, we can successfully extract the pipe defects and achieve the purpose of automated pipe defect detection. K-means clustering analysis based on particle swarm optimization successfully clusters the pipe defect images into three categories which are crack defects, pipe joint defects and hole corrosion respectively. Compared with the traditional K-means algorithm, K-means clustering analysis based on particle swarm optimization can increase clustering accuracy by 9%, 16.7% and 12.5% respectively. The clustering analysis based on particle swarm optimization and the statistical pattern recognition classifier is used to classify the pipe defects. The classification accuracy of the three types of defects is more than 80%. The accuracy of pipe joint defects and hole corrosion is more than 90%. In summary, an integrated algorithm scheme for automated pipe defect detection and classification based on digital image processing technology is proposed. The experiments show that the algorithm scheme has the characteristics of high degree of automation, high versatility and accuracy. Related Articles | Metrics

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Model Reuse Oriented Simulation Cloud Service Platform Design and Implementation ZHAO Jicong1,2, HUANG Liping1,2, CHEN Junyu1,2, TIAN Ling1,2 2017, 38(6): 857-864.  DOI: 10.11996/JG.j.2095-302X.2017060857 Abstract ( 67 )   PDF (1368KB) ( 276 )   In order to solve the problems of low reuse of simulation resources and low efficiency of simulation, a simulation cloud service platform (SCSP) for model reuse is developed. For the requirement analysis in the simulation process, the platform uses hierarchical B/S architecture, including interface layer, application layer, support layer, platform layer and data layer. Aiming at simulation model reuse, functions such as simulation file parsing, model management and experimental design are realized. Based on the SaaS cloud service architecture, simulation remote running and monitoring are realized. The platform supports the models developed by a variety of commercial simulation software and programming languages. Finally, through the example of the planar simulation model, the support effect of the platform on simulation jobs is demonstrated. Related Articles | Metrics

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Research on Form of Wall Set Charging Pile Base on BP Neural Network ZHANG Shuo, WU Jiantao 2017, 38(6): 865-868.  DOI: 10.11996/JG.j.2095-302X.2017060865 Abstract ( 112 )   PDF (342KB) ( 185 )   By analyzing the sentimental images and elements of form of wall set charging pile, a BP neural network design model is established between them. Use the method of Likert scale to evaluate the form samples and sentimental words of wall set charging pile, calculate the matrix of sentimental evaluation. Then encode the elements of form and input them into the BP neural network as input parameters, normalize the data of matrix of sentimental evaluation as the output parameters. Finally train and test the BP neural network of wall set charging pile by Matlab and establish the mapping relation between elements of form and sentimental images. The BP neural network model of wall set charging pile was obtained. The accuracy of BP neural network model is measured by the function of mean square error. The results show that the BP neural network model between the sentimental images and the elements of form of the wall set charging pile is feasible. Related Articles | Metrics

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Research on User Cognition Pattern and Its Quantitative Model Oriented to Product Modeling Styles CUN Wenzhe, LV Jian, PAN Weijie, YUAN Guoshu, SUN Hui, LIU Guokai 2017, 38(6): 869-875.  DOI: 10.11996/JG.j.2095-302X.2017060869 Abstract ( 66 )   PDF (2271KB) ( 260 )   Aiming at the problem of subjective perceptual bias in the process of product design, this paper presents a user cognitive model and quantification model for product modeling style. Firstly, the Significance analysis of the feature elements in the product modeling style is analyzed, and the user cognitive model of the convergence of the characteristic elements to the linear contours is explored in combination with the concept of “style curve” and the characteristic line. Then, based on the feature integration, general cognitive model, that is, with the continuous deepening of user awareness, product modeling style in the user’s mind will gradually converge to the product characteristics of the linear contours. Finally, a quantitative model of linear contours of feature elements is proposed based on the concept of MATLAB correlation coefficient, which provides objective and rational decision-making basis for design activities. In this paper, the eye movement tracking experiment of CRH380 series of high speed train in China is carried out to verify the feasibility of the theoretical model. Related Articles | Metrics

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Research Status of Foreign Industrial Design Based on CiteSpace Metric Analysis DU Shuxing, PENG Liping, LIAN Lilin 2017, 38(6): 876-880.  DOI: 10.11996/JG.j.2095-302X.2017060876 Abstract ( 89 )   PDF (597KB) ( 225 )   Industrial Design plays a key role in the innovation-driven development of “Made in China 2025”. Based on the bibliometrics method, this paper analyzes 1 484 articles included in Web of ScienceTM with the theme of industrial design, by using science and technology text mining and visualization software CiteSpace. Visualization maps for information such as organizations engaged in industrial design research, research field and research hotpot are analyzed from four aspects: the number of published papers, the cooperative network of scientific research institutions, the related research fields and the key words. The results of analysis will provide a helpful reference for domestic industrial design education, industrial design research and development. Related Articles | Metrics

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Innovative Tiller Design Based on the TRIZ Demand Revolution Law 2017, 38(6): 881-886.  DOI: 10.11996/JG.j.2095-302X.2017060881 Abstract ( 108 )   PDF (3990KB) ( 154 )   Under the guidance of the TRIZ basic theories and methods, this study proposes an innovative design method of tillers based on the original innovation process model of the demand revolution law. A product of the same kind is first selected as the prototype of the development process in the future and then new user demands are determined using the five-step method. In combination with research methods, namely literatures, surveys, and voice of customers (VOC), etc. establish user demand expression. Then a functional model of tillers is established based on the original machine system analysis and tiller PDS, a design concept is concluded using the traditional methods and CAI software, and finally products are developed. This can effectively improve the modeling design, functional design, and mechanism design of tillers, so as to make the tiller design process more scientific and systematic. Related Articles | Metrics

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PET/CT Image Pixel-Level Fusion Algorithm Based on NSCT and Compressed Sensing LU Huiling1, ZHOU Tao1,2, WANG Huiqun2, XIA Yong3, SHI Hongbin4 2017, 38(6): 887-895.  DOI: 10.11996/JG.j.2095-302X.2017060887 Abstract ( 89 )   PDF (934KB) ( 166 )   There are four construction methods of fusion rules in Piella framework, according to the first method, a pixel-level fusion algorithm of PET/CT based on non-subsampled contourlet transform (NSCT) and compressed sensing is proposed. Firstly, NSCT is used to decompose the registered PET and CT image. Secondly, in order to highlight the focal region of the low frequency image, the low frequency components are fused by pulse coupled neural network (PCNN) which more high sensitivity to the characteristics and regions. Thirdly, in high frequency, the Gauss random matrix is used for compression measurement, in sub-block of high frequency, histogram distance is utilized in match measure, the regional energy is regarded as the activity measure. The fusion factor ‘d’ is calculated by adaptive decision model using matching measure and activity measure. According to the fusion factor, the high frequency measurement values are fused, and the high frequency fusion image are reconstructed by using the orthogonal matching pursuit algorithm. Fourthly, the final fusing images are acquired through the NSCT inverse transformation of low frequency fusion image and high frequency fusion image. Finally, three experiments are done, comparison experiment with other image fusion algorithms, comparison with different activity measures and different matching measures. The experimental results shown that the algorithm can retain and show the edge and texture information of focus better. And the algorithm are superior to other fusion algorithms from subjective and objective evaluation. Related Articles | Metrics

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Research on Business Process Reengineering of Project Management Based on BIM Visual Threshold ZHONG Wei1, ZHANG Kaile1, YANG Gangying2, NIE Fengya3 2017, 38(6): 896-903.  DOI: 10.11996/JG.j.2095-302X.2017060896 Abstract ( 85 )   PDF (872KB) ( 227 )   Aiming at the information integration of local block in the current stage of project management and business process separates, cooperative project management problems such as weakening the positive effect, taking a large public construction project in Tianjin as an example, the information value chain theory is applied to process reengineering. The new process of scheduling cost is divided into three parts: information input factor, information process factor and information output factor in the BIM context. Then taking participants into the same process reengineering value chain and integrating the information transmission link of various stages between all participants to make up for the shortcomings of traditional business processes, to improve the efficiency of workflow transformation and to save transaction cost. Related Articles | Metrics

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BIM Level of Development and Application in a Construction Bid Project JI Fanrong, CAO Jianghong 2017, 38(6): 904-908.  DOI: 10.11996/JG.j.2095-302X.2017060904 Abstract ( 114 )   PDF (1567KB) ( 339 )   With the increasing competition in construction bidding market, BIM, as auxiliary methods, can effectively improve the technology bid, and becomes one of the effective means to improve the success rate. According to code for construction organization plan of building engineering, in this paper, we comb the BIM application in the engineering situation, construction arrangement, schedule, construction preparation, construction scheme and construction site layout plan, put forward the technical bid level of architecture, structure, enclosure, etc. eight types of modeling development. Based on the actual bidding case, this paper analyzed the characteristics of BIM modeling and decomposition of the model breakdown structure, then summarize bidding implementation strategies from organization, process model aspects. Related Articles | Metrics

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Study on Experiential Teaching Mode of Engineering Drawing for International Undergraduate Student CHANG Jianmei, FENG Huaiping 2017, 38(6): 909-913.  DOI: 10.11996/JG.j.2095-302X.2017060909 Abstract ( 67 )   PDF (2968KB) ( 178 )   With the full implementation of the “Belt and Road” strategy, there are more and more international students enrolling in engineering colleges and universities in China. Engineering drawing is a very important course for the engineering specialty. In this paper, based on the teaching practice of engineering drawing for civil international students, the experiential teaching mode is proposed. This mode is student-centered and focuses on creating of situation and practicing. This mode can spur the student to fuse personal experience and practice with self-examination and internalization. Motivation, construction of mode, implementation method and the teaching effect of this mode are discussed. It shows that this experiential teaching mode can attract the student and improve the teaching effect. Related Articles | Metrics

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Discussion on Content System of Engineering Graphics Textbook and Some Concept Description DONG Guoyao1, XIAO Yinling2, XUE Lihua2 2017, 38(6): 914-918.  DOI: 10.11996/JG.j.2095-302X.2017060914 Abstract ( 89 )   PDF (258KB) ( 185 )   The content system of engineering graphics textbook with drawings is proposed. The contents and methods of textbook adjustment are pointed out, such as the concept of view, the introduction timing of axonometric projection, the limit and fit, the standard part in detail and assembly drawings, sorting and perfecting the relation of detail drawings and assembly drawings, et al. In this paper, the concepts and terms of engineering graphics are expressed exactly, such as orthogonal projection and view, similarity, formation of rotation body, accumulation and projection, superposition and level, size datum and main size, third angle method and the description of some perspective projection terms, to further improve the scientific nature and quality of engineering graphics course and textbook and the cultivation of high level talents, et al. Related Articles | Metrics

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Investigation and Research on the Current Graphics Education Situation in the Internet Age ZHANG Jingying, TONG Xianying, YANG Wei 2017, 38(6): 919-924.  DOI: 10.11996/JG.j.2095-302X.2017060919 Abstract ( 84 )   PDF (299KB) ( 375 )   With the rapid development of internet and CAD technologies, the content, mode and methods of graphics teaching develop rapidly in colleges and universities in China. Accordingly, a large-scale survey about current graphics education situation in a national colleges and universities has been launched from the of 2015. It is the eighth large-scale survey after those in 1997, 1998, 2000, 2002, 2004, 2006 and 2008. Based on the results of this survey, the current education situation and the developing tendency in the future are described. It will be helpful for the researchers and teachers in the field of Engineering Graphics in China. Related Articles | Metrics

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Development of Suide Stone Carving Art Elements Data Platform Based on Information Dissemination LIU Zijian, AI Dongxu, DUAN Yanjie, ZHANG Li 2017, 38(6): 925-930.  DOI: 10.11996/JG.j.2095-302X.2017060925 Abstract ( 57 )   PDF (1146KB) ( 161 )   Digital and graphic design has become a major carrier for the dissemination of information and awareness. This article is based on the situation of the protection and innovation of folk art skills, with Suide stone digital construction as the starting point, through the classification of the artistic elements of Suide stone art, the art elements are extracted and digitized. Then, based on the Android platform, with network technology and computer-aided technical means, the data platform of digital art elements is constructed and implemented. The purpose is to research, spread to promote the development of local stone characteristics of industrial development, to promote the development of the production of technical protection, to create folk art skills which dates from local art skills and applicable to the modern way of life. Related Articles | Metrics

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APDL Modeling Method for Hydraulic Load Balancing Suspension of Transporting Girder Vehicle XING Haijun, HAN Weifeng, ZHANG Han, FENG Guizhen 2017, 38(6): 931-934.  DOI: 10.11996/JG.j.2095-302X.2017060931 Abstract ( 60 )   PDF (529KB) ( 154 )   Transporting girder vehicle is a heavy-duty transport equipment for bridge construction. Its running system consists of dozens of tire components connected with the frame of transporting girder vehicle by hydraulic load balancing suspension. In finite element analysis of the transporting girder vehicle, it is a key problem to simulate the real force condition of the hydraulic load balancing suspension. In order to solve this problem, a finite element model of transporting girder which have multilayer balancing beams and proper boundary conditions is built. The model is a static structure ensuring that the force situations are strict in accord with actual conditions although it has multiple point of support. Based on the APDL language of ANSYS software, the finite element model of transport girder vehicle is established, and the process of establishing the multilayer balancing beams model is introduced in detail. The simulation results prove the feasibility and validity of the method. Related Articles | Metrics