Table of Content

25 October 2018, Volume 29 Issue 20

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Problem Solving Oriented Knowledge Modularized Supporting Service

2018, 29(20):  2395-2400. 

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Aiming at the phenomenon of knowledge modularization in the solving enterprise business problem  processes，an idea of knowledge modularization was proposed in order to improve the business execution performance and innovation.Taking the knowledge module as the basic unit of knowledge service of enterprise business execution capability and considering the interaction among business，knowledge and context，a knowledge modularization model was established.Furthermore，the framework of knowledge modularized service systems for solving business problems was constructed，and the architecture framework of business problem solving oriented knowledge modular service systems was designed.

SLA Oriented Energy Efficiency Evaluation of Manufacturing Service

XIANG Feng, HUANG Yuanyuan, ZUO Ying, TAO Fei

2018, 29(20):  2401-2407,2415. 

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The development stages that included energy consumption assessment of products，energy efficiency evaluation of products，energy consumption evaluation of manufacturing services，energy efficiency evaluation of SLA oriented manufacturing services etc. were analyzed herein.Different from unit product efficiency assessment，SLA was oriented manufacturing service energy efficiency assessments，which was an assessment of the energy consumption efficiency of the whole life cycle of manufacturing services under the cost and quality of service agreed by the service providers and users.Then a SLA oriented evaluation framework for manufacturing service efficiency was put forward，which analyzed 5 key technologies，and provided the theoretical basis for users to provide available at any time，high quality low consumption manufacturing services.

Impacts of Information Sharing and IT on Customering Service Performance：Consider Interaction Effects

ZHANG Wenjie, LI Gang,

2018, 29(20):  2408-2415. 

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The relationships among enterprise information sharing，IT application，interaction effect，delivery service，after-sale service and company finance performance were explored.According to survey data from manufacturing companies in China，a conceptual model was empirically tested by structural equation modeling，and the results indicate that high level information sharing has positive effects on both delivery service and after-sale service，high level IT application is only positively associated with delivery service，but doesn't have significance effects on after-sale service performance，and the interaction of information sharing and IT application has positive effects on delivery service performance，both delivery service and after-sale service performance may enhance financial performance.The results show that the interaction effects of information sharing and IT application have important function in delivery performance，and enterprise should allocate information sharing and IT application properly in practices in order to improve customer service performance.

Optimization of Product-service System Concepts Based on Rough Choquet Integral

QIU Huaqing, GENG Xiuli, XU Yicai

2018, 29(20):  2416-2424. 

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Customer requirements （CRs） were used as evaluation indicators，and a PSS concept evaluation method was proposed based on rough Choquet integral.The determination of membership function of traditional fuzzy evaluation methods was subjective and random，and aiming at the problem，rough set theory was applied to deal with the evaluation informations.The type and strength of the indicator association relationships were described by fuzzy measures， and the Choquet integration operator was used to assemble the evaluation values of each concepts.Finally，an example of evaluating a company's printer PSS concepts was given out to verify the proposed method.The results show that the proposed method considers the uncertainty of the decision-making processes and the relationships of the evaluation indicators，and effectively improves the accuracy and rationality of the evaluation results.

Final Importance Rating Determining Method of ECs for PSS

WANG Haolun, CHENG Xianfu

2018, 29(20):  2425-2431. 

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A method was proposed，which considered the interaction between product and service to determine the final importance ratings of PSS ECs.A fuzzy soft set method was applied to solve the ambiguity and uncertainty in the processes of transmitting information in HoQ.The initial ratings of CRs（customer requirements） were adjusted by improvement ratings and selling points to obtain the final importance ratings of CRs.The correlation matrix of PSS ECs，competition priority and improvement ratio were used to correct the final importance ratings of PSS ECs based on the determined initial importance ratings of ECs.Finally，an example of wheel loader PSS was used to validate the effectiveness of the method.

Processing Method and Applications for “Content-Interactive” Two-dimensional Product Informations

WANG Haishuo, CHEN Ke, ZHENG Hongmei, WANG Yuanyuan

2018, 29(20):  2432-2437,2445. 

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The present processing methods of product informations had two limitations，which were the breadth lack of the contents and the depth insufficient of the interactions. To solve these two limitations，a processing method for “content-interaction” two-dimensional product information was proposed herein. Based on the analyses for product information contents and social interconnections，the platform's configuration and prototype system were briefly depicted. Some application scenarios were described by this processing method for production informations，and the development processes of a car air filter was shown as an example. Through the researches and analyses，this processing method improves the description of product informations and the communication among the participants.

Optimization Decision Method of Machine Tool  Resources Based on Bayesian Network under Cloud Manufacturing Environments

GONG Xiaorong, LI Xiaobin, YIN Chao

2018, 29(20):  2438-2445. 

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Combined with complex network theory，an optimal selection method for machine tool resources was proposed based on Bayesian network under cloud manufacturing environments.First，a mathematical description of optimal selection for machine tool resources under cloud manufacturing environments was presented.Then an uncertain multi?stage multi?objective decision model was built，which was composed of decision environmental variables，decision selection variables，decision transfer variables，decision target variables，decision value variables and causal dependency.The solution algorithm of the model was studied.Finally，an example was given to validate the applicability and effectiveness of the proposed method.

Experiments for Mechanics Characteristics of Shearer Hydraulic Rods

MAO Jun1;YANG Xinwei1;CHEN Hongyue1,2,3;SONG Qiushuang4;YUAN Zhi4

2018, 29(20):  2446-2452. 

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According to the fracture problems of hydraulic rods in the working processes of shearers，experimental platform for fully mechanized mining face of shearer was established based on parallel simulation of underground coal mine. Taking MG500/1180-WD shearer as the research object，tests and researches of mechanics characteristics of hydraulic rods were executed under no-load and full-load by wireless data transmission system. The results show that the loads of hydraulic rods do not reach the pre-test pre-tightening forces under different working conditions. The two hydraulic rods located above the fuselage have larger load when shearer starts. Hydraulic rods located above the shearer side are in compression status and bear the maximum loads.

Study on Nonlinear Vibration of Vehicle Dual Mass Flywheels with Three-stage Piecewise Stiffnesses

ZENG Liping1;CHEN Qiping1;YUAN Xingxing2;XIAO Qiang1;ZHOU Conghui1;HUANG Juanlin1

2018, 29(20):  2453-2459. 

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For a DMF with three-stage piecewise stiffness，the change characteristics of the DMF stiffnesses with torsional angles were analyzed.And considering the stiffness nonlinear characteristics，torsional vibration model of the vehicle drive system equipped with the DMF and the corresponding differential equations were established.To explore the nonlinear vibration characteristics of the DMF，the average method and Runge-Kutta numerical integration method were applied for the derivation and analysis of the torsional angle nonlinear frequency characteristics approximate resolutions，and the forced vibration response simulation analyses were carried out with different torque frequencies.

Kinematics Characteristics Analysis of a New 3-UPU Parallel Mechanism with Continuous Rotation Axes

HAN Xueyan1，2;WANG Ziyi1，2;LI Shihua1，2;TIAN Zhili1，2

2018, 29(20):  2460-2466. 

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A novel 3-UPU parallel mechanism was proposed，which has 2R1T degrees of freedom （DOFs）.Based on the geometric properties of the uniparted hyperboloid，the mechanism's symmetry about middle plane was discovered，and the non instantaneity of the mechanism's DOF was approved.It was verified by simulation that the moving platform might rotate continuously around any axis in the middle plane.The inverse kinematics solutions were derived by a new method of solving the attitude matrix of platform with two rotational DOFs，and the workspace was analysed.The research results provide theoretical references for the applications of the mechanisms.

Size Synthesis of Disc Cam Mechanisms with Floating Roller Pushrods Aiming at Obstacle Avoidance and Compact

LIN Mengjie;LI Yanping;CHANG Yong

2018, 29(20):  2467-2473,2478. 

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According to the class I size synthesis theory based on the basic idea of releasing roller centers and cam axes，some basic theories and important conclusions were summarized to solve the optimal cam axes [O**1]which were the most eligible solution in the whole processes of obstacle avoidance perfectly.To propose a new algorithm aiming at solving the optimum solution of the mechanisms，an analytic criterion of rollers and cams for avoiding obstacles in the whole procedure and simplified search areas [Σ][2]and [Σ][0] were presented，and then brought forward an ergodic search method to solve the feasible areas of cam axes [O**1] and roller centers C through the whole processes of avoiding obstacle successfully.The dimensional synthesis of disk cam mechanisms for obstacle avoidance and compact floating roller pushrods were resolved.A mechanism synthesis example was displayed.

Improved Interactive Genetic Algorithm for Product Configuration Design

ZHU Jiadong;SU Shaohui;CHEN Chang;LIU Guiying

2018, 29(20):  2474-2478. 

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Traditional interactive genetic algorithm was optimized to reduce customer fatigue.It is optimized by improving the individual variations and genetic manipulations，and was applied to the multi functional hydraulic jack configurations.Through the results of the product configuration and compareing with the traditional interactive genetic algorithm，the new interactive genetic algorithm may reduce user fatigue effectively，and faster configuration of products which satisfy with users.

Compliance Calculation and Behavior Analysis of a Novel Right Circular Corner-filled Hybrid Multiple-axis Flexure Hinge

LIU Qingling;LUO Ping;YU Changjuan

2018, 29(20):  2479-2483. 

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A novel multiple-axis flexure hinge—right circular corner-filleted hybrid multiple-axis flexure hinge was presented.Based on Castigliano's second theorem，compliance formulas were formulated.Compliance calculations and finite element simulation were performed simultaneously for a sets of examples.By contrast to the results，correctness of the compliance formulas were verified.The ratio [λ] named as thickness-length ratio was defined，and the relation between the compliance errors and [λ] were analyzed.By means of the compliance formulas，the effects of the structural parameters on the compliance were analyzed.Compared with the right-circlar multiple-axis flexure hinges，compliance and sensitivity to the load of the novel hybrid multiple-axis flexure hinge are better than those of the right-circlar multiple-axis flexure hinge.

Upper-limb Exoskeletal Mirror Rehabilitation Robot Systems Based on Motion Sensing Control

QU Chang;WU Bing;CHEN Houjun;YU Chenchen;SHEN Fang

2018, 29(20):  2484-2489. 

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In order to assist affected-limb to perform rehabilitation training，an upper-limb exoskeletal mirror rehabilitation robot systems was developed based on motion sensing control.A 3-DOF wearable robot for upper-limb rehabilitation was designed.Skeleton data of 6 joints were collected by Kinect sensors which were converted into control signals after calculations.The control commands were sent to upper-limb exoskeletal robot to assist affected-limb to perform mirror or synchronous rehabilitation training.Experimental platform of upper-limb exoskeletal rehabilitation robot system was built up，and experiments about single joint mirror control and multi-joint synchronous control were carried out.The results prove that this system has good performance of following control，and may meet the training requirements for upper-limb rehabilitation.

Applications of Improved PSO_BP_Adaboost Algorithm in Fault Diagnosis of Dimension Out-of-tolerance

JIANG Chunying;KANG Yuxiang;YE Changlong;YU Suyang

2018, 29(20):  2490-2494. 

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An improved PSO algorithm was used to optimize a BP neural network，and a number of BP networks can form a kind of Adaboost strong classifier.Therefore，an improved PSO_BP_Adaboost multi-classifier algorithm was established with the idea of “one-to-one”，and the validity was proved by some of UCI dataset.The same diameters of 4 holes in different positions on one workpiece were chosen as the input values of the BP network.It was verified by real data that the correct rate of the algorithm reaches 98%.The results show that this improved PSO_BP_Adaboost algorithm may be used effectively for dimension fault diagnosis of out-of-tolerance.

Trajectory Planning of a Three-arm Space Robot Based on Pose Feedback

LAN Qijie1，3;LIU Yicheng1;ZHANG Tao2

2018, 29(20):  2495-2501. 

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A trajectory planning algorithm was proposed based on pose error feedback for a three-arm space robot.The pose error problems might be solved when the robot went through a singular region.The kinematics model of the three-arm space robot was established by general kinematics equation and law of momentum conservation.The pose error kinematics equations were established by position and attitude expectations.Taking joint angular velocity as the control variable, a controller was designed based on error feedback of end-effectors and bases.The tracking errors of closed-loop system possessed specified exponential convergence rates.The method may reduce pose errors in the neighborhood of singularity points and eliminate the errors completely after leaving singular regions.Simulation results demonstrate the effectiveness of the proposed trajectory planning method.

A Fitting Algorithm Based on Least Square Method and Spiral for Discrete Points

YOU Zhongtong1;WANG Taiyong1;LIU Qingjian2;XIN Quanqi1

2018, 29(20):  2502-2506,2514. 

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In order to solve the problems of large amount of small line segments tool path data in NC machining processes，a fitting algorithm was proposed based on Archimedes spiral for small line segments or discrete points.The relationship between parameters of Archimedes spiral and angles between tangent vector and radius vector were analyzed，and a calculation method of fitting errors was given.Based on the principles of least square，through forward and backward searching the discrete points to fit them with small numbers of Archimedes spirals under the premise of meeting the precision requirements.Simulation results show the advantages of Archimedes spiral fitting discrete points whose data amount is small while fitting precision is high.

Study on Single Point Incremental Forming Processes of Corrugated Tubes

SHI Xun;LI Yan;YANG Mingshun;YAO Zimeng;HOU Xiaoli

2018, 29(20):  2507-2514. 

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Single point incremental forming technology was introduced into the metal corrugated tubes forming processes，and a single point incremental forming processes of metal corrugated tubes was presented.Finite element model of single point incremental forming of metal corrugated tubes was established based on ABAQUS/Explicit.Analysis results show that the evolution of forming forces，forming stresses，local deformation displacements，and plastic strain distributions in the forming processes.An experimental platform for single point incremental forming was set up.These data of the forming processes  were collected，and the experimental data were analyzed.The results show that this component in X direction forces in the incremental forming force of the tube wall is the largest，followed by Y direction and Z direction.There is a large plastic strain in inclined wall areas and the circular-arc surfaces，which has easily leads to the thickness thinning and cracking of tube walls.

3D Numerical Simulation of Aluminum Powders under Impact Loading Based on Discrete Element Method

LUO Xiaolong;LIU Jun;TIAN Shijun;LIN Li;ZHOU Chun

2018, 29(20):  2515-2519. 

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A 3D discrete element software PFC3D was applied to simulate the impact loading of metal powders under 3D conditions，based on the discrete element method.The simulation results were verified by split Hopkinson pressure bar experiments.In addition，movement of particles in the compaction processes was analyzed，the velocity distribution of particles is irregular arcs，and there is a distribution gradient.When the impact occurred，the particles were rearranged mainly by transverse movement，with the increase of particle velocity，the moving direction of the particles was gradually shifted downward.The vertical movement of the upper particles and the lateral rearrangement of the lower particles are the main causes of shearing between the particles.