Table of Content

27 July 2010, Volume 21 Issue 14

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A Conveyance Method for Discontinuous Winding Processes Based on Synchronous Position Control

CHEN Jian-Kuai, YIN Zhou-Beng, XIONG Wei-Lun

2010, 21(14):  1639-1642. 

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A precise conveyance method, based on synchronous position control,was proposed to fulfill special requirements of positioning precision in discontinuous winding processes for flexible web.Two vision systems were used to survey and feedback the positioning errors.Iterative methods and positioning command counters make the four winding motors keep synchronous.The PMAC finally implemented the precise conveyance in the discontinuous winding process.The data gathered from the testing platform,

presents that this conveyance strategy is effectual in precise feeding for discontinuous winding systems, and suffice the RFID packaging equipment.

A Method of Structural Shape Optimization Based on Vibration Response Fields

CANG Xian-Guo, XU De-Ge, TAO Ling-Yun

2010, 21(14):  1643-1646. 

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A parameterized shape optimization model was established based on finite element meshes and a structural shape optimization method was presented based on vibration response fields for controlling the structural vibration. In this method, according to a group of vibration response peaks, vibration response fields were chosen as the vector fields of the parameterized shape optimization model.The shape optimization function of modification domain was defined using a linear combination of a group of vector fields, and each coefficient of vibration response fields was used as a design variable.

The structural shape was optimized using the genetic algorithm to decrease the structural vibration. Structural shape optimization was studied under excitation. The numerical example shows that structural vibration can be controlled effectively.

Study on Vibration Characteristics of One Scissors Linkage Seat with Suspension of the Air Spring and Auxiliary Chamber 

LIU Wei, SHU Sai-Hong, WANG Jia-Qing, SHU Xing-Xing

2010, 21(14):  1647-1650. 

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A air spring with auxiliary chamber was used in one kind of scissors linkage seat.The motion differential equation of the air suspension seat was established and the theoretical computing formulation of its equivalent vertical stiffness, equivalent damping coefficient, natural frequency and damping rate were deducted, besides, the influence factors of them were analyzed.Taking SK37-6 membrane type air spring

of ContiTech and HY-Z04 type scissors linkage seat as an example, the equivalent stiffness, damping coefficient and natural frequency in different conditions of the sprung mass and the throttle’s size were computed and analyzed. Study results show that the natural frequency descends with the throttle’s size increasing; as a result, in order to adapt different driver’s weights and road conditions, the systerm’s natural frequency can be changed by adjusting the throttle’s size to make it more comfortable.

Parameter Probability Constraint Optimization of Wedged-ring Based on FEM

DU Hong-Wei, TAO Jin, YANG Hai-Chao

2010, 21(14):  1651-1654. 

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A synthetical way of probability constraint optimum design based on FEM was given. Firstly,using Monte Carlo method to simulate the distribution of random input variables and then the stress and displacement of Wedged-Ring were analyzed by nonlinear FEM .Secondly,the response surface of results was fitting by least square method in design space .Finally, probability constraint was translated into ascertainable constraint by method called first-order second-moment and optimization was completed.The optimization results show the thickness of Wedged-Ring is 40% less than that of the initial structure under probability constraints of strength and rigid.

Research on Dynamic Characteristics of Gear Coupling Rotor System in Gas Turbine

LI Guo-Yun, QIN Da-Tong

2010, 21(14):  1655-1660. 

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In order to reduce the unbalance reponse of gear-rotor system of gas turbine,a dynamic analysis method was applied to evaluate this system.Based on dynamic parameters of journal bearing and gears, the lateral vibration analysis model of only one rotor was built by means of the transfer matrix method. The transmission matrix of herringbone gear-coupled unit was derived. In addition, using whole transfer matrix method, the lateral-torsional coupling analysis model of herringbone gear-rotor system was set up, and the vibration characteristics of gear-rotor-bearing system of gas turbine was

analyzed.Through numerical calculations and analyses,the eigenvalue of gear-rotor

system,the Logarithmic decrement and the critical speed were

obtained.The results show that the operational speed of this gear-rotor-bearing system is far away from the critical speed. This tranasmissiion system is stable and safe.

Design and Experimental Research on Abnormity Guide Plate of New Hy-Vo Silent Chain

MENG Fan-Zhong, QU Chao-Peng, SONG Ting-Ting

2010, 21(14):  1660-1663. 

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Based on the assembly of a new type Hy-Vo silent chain and force analysis, a concept that the assembly clearance of chain can be compensated by reasonable shape design and the guide plate parameters was introduced. Elongation variables of the guide plates with different shapes in elongating procedure were analyzed and researched, and a new design method of butterfly-shape guide plate was proposed. By experiments the conclusion that butterfly-shape guide plate can compensate assembly clearance with smaller tension of chain is obtained. During that process, the pin and working plates can fully contact and bear the load together so that the bearing situation of the new Hy-Vo silent chain is also changed. The method is proved to be reasonable, from which important evidence for guide plate design can be acquired.

Test and Analysis of Effect of Rotating Speed on Friction Torque Fluctuation in Ball Screw Systems

KANG Xian-Min, FU Wei-Beng, WANG Da-Cheng, WANG Jian-Sheng, MA Dun

2010, 21(14):  1664-1668. 

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According to Hertz contact theory,this paper discussed the elastic deformation in the ball screw systems and elastic potential energy caused by it.Force and kinetic energy analysis were carried out on the balls in the screw groove and recirculating mechanism.The text deduces that when the ball is pushed into the screw groove, there is a critical speed due to its kinetic energy, if ball’s speed is less than the critical speed, the friction torque fluctuation is large, and when it is higher than the critical speed, the force changes,the friction torque fluctuation has a tendency to reduce because of the force changing. And the experimental data validates the friction torque fluctuated at different speeds.

A 6-CRS Parallel Manipulator and Its Positional Analysis

CHE Lin-Xian, HE Bing, CHENG Zhi-Gong

2010, 21(14):  1669-1675. 

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This paper presented a 6-CRS general Stewart parallel manipulator and established its geometrical model.The screw theory was employed to discuss the rationality of chosen different actuated inputs,i.e. rotary actuation or linear actuation of the cylindrical pairs, respectively, and the corresponding direct/inverse solutions were investigated for positional analysis of this mechanism. In order to improve the performance of DE algorithm, we developed an adaptive escape DE(AEDE) algorithm that can effectively overcome premature convergence and increase precision of solutions. When the actuated pairs were rotary actuations, the nonlinear equations were obtained to analyze forward displacement of this manipulator and solved by the AEDE algorithm.On the other hand, when the actuated pairs were linear ones, the completely closed formed formulae were proposed to get its direct solutions of displacement. The results of numerical verification show that all forward solutions for rotary actuations can be precisely found by the AEDE algorithm and they are very coincident with the inverse ones.

Torsion Stiffness Calculation and Optimization Design of Arc Helix Spring of DMF

CHEN De-Min, HUANG Zheng, LING Chao, SUN Wei

2010, 21(14):  1676-1682. 

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To reduce torsion vibration of automotive power train,the elastic expression of arc helix spring was built by the C-grade car’s performance parameters.DMF parameters’ effect on natural characteristics of automotive power train was analyzed. A simulated model of torsion vibration of automotive power train was established by MSC. Easy5,and the DMF parameters’ effect on torsion vibration was analyzed.A DMF was designed for the car,and the simulation of torsion vibration was made.Further,the

experiments were made and the results prove that the design of DMF can satisfy the use of the car.

Research on Active Disassembly Design Methods Based on SMP

LIU Zhi-Feng, LI Xin-Yu, ZHANG Hong-Chao

2010, 21(14):  1682-1686. 

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Elements of SMP were introduced, and design methods and application rules of active disassembly devices based on SMP were put forward. Based on these design methods and application rules, some remote controls were redesigned. The active disassembly experiments of redesigned remotes show that the disassembly efficiency is obviously enhanced, and the cost is much lower than that using shape memory alloy devices.

New Concept for Manufacturing Industry——Closed-loop Product Lifecycle Management

WANG Xu, LI Wen-Chuan

2010, 21(14):  1687-1693. 

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A concept of closed-loop product lifecycle management was introduced according to the limitation of traditional product lifecycle management.The connotation,operation mechanism and research topics of closed-loop PLM were discussed,and the technology system composed of key technology,core function and typical application was constructed and detailed.Finally the shortcomings and future trends were pointed out based on the analysis of research status of closed-loop PLM at home and abroad.

Manufacture Task Allocation Service Based on Grey Theory

ZHANG Wei, BO Xiao-Hong, TIAN Jing-Gong, CHU Yong, ZHANG Yong

2010, 21(14):  1694-1697,1703. 

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Through the services of the product manufacture duty and the enterprise resource definitions as well as based on the material detailed list data flow analysis,one kind of intellectualized manufacture task allocation model was established.Based on the ASP pattern,this model used mobile-Agent technology construction, forgave the manufacture duty static assignment, the dynamic allocation and the assignment strategy. Using grey theory to design manufacture task allocation Agent,an evaluating indicator quantification table was established,the analytic hierarchy process was used to determinate evaluating indicator weighting factor,and the solution was carried on using gray relational grade. Through the concrete example’s applications,the gray analysis optimization of manufacture task allocation strategy indicates feasibility and superiority.

Configuration Transformation Matrix of Metamorphic Mechanisms and Joint-orientation Change Metamorphic Method

LI Shu-Jun, DAI Jian-Sheng

2010, 21(14):  1698-1703. 

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It is necessary to develop a topological representation with elements of joint-orientation in it for the joint-orientation change metamorphic processes.A configuration transformation matrix, in which the connectivity of links, the types of joint and their orientations of kinematic chains were clearly expressed,was hence proposed to describe and transform the topological configuration of metamorphic mechanisms. A joint-orientation interchanged metamorphic method was introduced based on the matrix as follows. First, the configuration transformation matrix of the planar kinematic chain was to be developed. Secondly, the configuration transformation matrix of planar kinematic chain was to be developed with joint(s) having the passive degree of freedom. Thirdly, the configuration transformation matrix of joint-orientation interchanged metamorphic mechanisms can be obtained by changing the orientations of joint(s). Finally, a kimematic sketch was to be designed based on the matrix. The examples show that the proposed topological characteristic matrix provides more structural information with fewer elements and can be used conveniently.The paper provides a design method with efficiency and practicality.

Research on Technology Architecture of Equipment Autonomic Logistics System

XU Yu-Guo, LIU Guan-Jun, QIU Jing, SU Yong-Ding

2010, 21(14):  1704-1708. 

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According to the characteristics of precision and complexity appearing in equipment maintenance logistics, a research area of equipment autonomic logistics was proposed. Based on general analysis of equipment maintenance requirements

 and logistics system evolvement, the system architecture and technology architecture of

equipment autonomic logistics were described, the core of equipment autonomic logistics was summarized as fault prognostics and maintenance logistics networks architecture,

and the technology architecture of autonomic logistics was analyzed. The technologies involved modeling and analysis on maintenance logistics networks, trigger and respond strategy on maintenance logistics behavior, maintenance decision optimization, and dynamic networks reconnection and resource reconfiguration.

Modeling and Control of Vehicle Electric Power Steering and Active Suspension System Based on Multibody Dynamics and Rule-based Coordination

WANG Ji-Dong, QIN Wei-Hua, CHEN Mo-Wei

2010, 21(14):  1709-1714. 

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The multibody model of a full vehicle which equipped the

EPS system and the ASS was set up based on multibody dynamics theory.Also an EPS,ASS and rule-based central controller which supervised and coordinated the subsystems were designed based on the motion coupling relationships between steering and suspension systems. Under Matlab,the simulations of vehicle ride comfort and maneuverability were carried out. The results show that the use of the multibody model for the integrated control research of chassis is convenient and viable,also the control scheme can effectively improve the ride comfort and maneuverability.

Research on Metal Flow of Internal Thread of High Strength Steel during Cold Extrusion for Aircraft Landing Gear

JIU Hong, ZUO Dui-Wen, ZHANG Min, HONG Hong-Feng

2010, 21(14):  1714-1718. 

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The forming process of internal thread of aircraft landing gear with cold extrusion was studied. Through metallographic analysis of the material, microstructure change and deformation mechanism of crest, flank and root of the thread along the layer depth direction were obtained. The results show that the pressure on the crest of thread under the teeth of extrusion tap was relatively small, and the root was biggest. When the metal flows to the crest, the resistance is smallest.In the extrusion processes, the hardness and the intensity of the material are increased significantly,and the plasticity and the toughness are decreased. It appeares work-hardening phenomenon and increases the surface texture and the mechanical strength greatly of internal thread with cold extrusion.

Study on Large-scale Space Angle Measurement Errors Based on Common Optical Reference

TAO Jiang-Wei, ZHANG Guo-Xiong, QIU Jie-Rong, HU Wen-Chuan, LI Xing-Hua

2010, 21(14):  1718-1721. 

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Under the proposed large-scale space angle measurement principle based on common optical reference,methods for the accuracy design,the position and attitude error detection and compensation of the corresponding measuring system were proposed.Besides,a calibration method with reference angle artifacts and electronic level was developed and the measurement accuracy was assessed.

Research on Particularity for Oval Noncircular Bevel Gearing

LIN Chao, HOU Yu-Jie, DAN Xiao-Hu, QIU Hua

2010, 21(14):  1722-1725,1731. 

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A new form of oval noncircular bevel gear transmission was proposed,which can transfer variable ratio motion and power between the intersecting shafts.A mesh coordinate system on the pitch cone of the oval noncircular bevel gear was established in which the formulas of transmission ratio and displacement etc. were deduced based on analyzing meshing theory. The influences of eccentricity ratio on kinetic characteristics such as the displacement, the angular, the oscillating line of pitch cone contact generator and periodicity were analyzed. Having finished experimental researches, comparisons between experimental results and theoretical analysis were made to get its laws of transmission and methods for design and to verify the drive characteristics of oval noncircular bevel gear.

Experimental Analysis of Vibrational Rotary Forging Deformation

CA Gai-Pin, JIANG Zhi-Hong

2010, 21(14):  1726-1731. 

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In order to validate correctness of some theoretical analyses for a vibration rotary forging deforming,on the basis of measurement method for rotary forging force, with different technical parameters and vibrational parameters, some experimental projects were designed by orthogonal experimental method, then deforming resistance and deforming characteristics were obtained with different experimental parameters.And some influences were analyzed including deforming time and deforming resistance force of workpiece by frequency, amplitude, rotate speed of forging die, feed per rotation and deforming temperature.At the same time, a figuration of workpiece deformed by general rotary forging was compared with that of deformed by vibrational rotary forging, and deforming characteristics of actual forging rotary workpiece were also compared with that of the FEM workpiece. It is shown from experimental analysis and comparison that the vibrational rotary forging process has smaller deforming force, shorter deforming time, higher deforming quality than that of the general rotary forging, and the experimental results are well consistence with the theoretical analysis and the FEM results.

Simulation on Extrusion Process of 6061 Aluminum Alloy Cup Part

DONG Hong-Bei, WANG Gao-Chao, CHANG Chun

2010, 21(14):  1732-1735. 

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In order to forecast the defects of the cup part formed by the 6061 aluminum alloy,3D and 2D elastoplasticity FEM models were established with software of Deform-3D and MSC.Superform respectively. The reason for such defects was analyzed and the methods for improving simulation accuracy were proposed. Meanwhile, the corresponding experimental researches were conducted. The results show that the forming defects like underfilling, overlap and crack occur at each cup part of aluminum alloy. For this axisymmetric problem, the calculated results of 2D FEM model are proved superior to those of 3D model. Good agreement is found between the numerical results and experimental work.

Effects on Ultrasonic Scattering Attenuation Coefficient of Morphological Characteristics of Voids in Composite Materials

ZHANG Xiang, CHEN Jun, LIN Chi, LI Chi-Meng

2010, 21(14):  1735-1741. 

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Utilizing the finite difference time domain method, the relations among ultrasonic attenuation coefficient and each single morphological factor such as the shape, orientation, amount and distribution, as well as the comprehensive random characteristics of voids were calculated based on the 2-D random void model of composite materials.In addition,comparisons of ultrasonic attenuation coefficients between predicted results and experimental ones were presented for carbon fiber composite specimens with a void content range of 0.03%~4.62%. It is found that, the void shape,orientation, and account all affect ultrasonic attenuation coefficient. Moreover, the random morphology of voids causes fluctuation of the ultrasonic attenuation coefficient. 

Study on Car-to-Truck Rear-end Impact Experiment and Simulation Based on Accident

Analysis

BAI Zhong-Gao, MA Wei-Jie, CAO Li-Bei, ZHANG Jian-Bin

2010, 21(14):  1742-1747. 

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Statistics and analysis were conducted for car-to-truck rear impact accidents on highway of Hunan province. And measurements and statistics of rear guards were conducted on highways. It is found that more than 2/3 of the rear guards can not satisfy the national requirements.The results show the passenger compartment of a car will deform so seriously that it causes severe or fatal injuries for the occupants. In order to verify the effectiveness of 3 typical rear guard structures, including channel steel, rectangular steel and bent steel plate, three groups of rear-end crash experiments were conducted. Based on the tests’ results, A FE model of car-truck and rigid MB rear end impact were built, and simulated with different crash velocity and ground. The results of the tests and simulations show that the stiffness of the existing rear guard is too large to absorb enough energy and prevent the intrusion of the passenger compartment at a higher speed.And it is demonstrated that the national requirement GB11567.2-2001 will be further studied and amended because it can not represent the real world situations.

Design and Simulation of Rigidity and Damping-coefficient on Semi-trailing Arm Suspension

HU Shen-Lin, CHEN Xin-Bei

2010, 21(14):  1747-1751. 

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A method of coordinate transition in spatial mechanism theory was introduced to study the revolving movement of the arm in a semi-trailing arm suspension around a space-fixed axis, based on which the relationship between the rigidity of suspension and that of the coil spring as well as relationship between suspension damping-coefficient and shock absorber damping-coefficient was exactly derived.As a result the change of suspension rigidity and damping coefficient with respect to wheel bumping movement was plotted accurately. A calculation program was composed to make the calculation process feasible and efficient, while the result was verified using a virtual prototype of the suspension.

Research Progresses on Toughening Mechanism and Arc Characteristics of Self-shielded Flux-cored Wire

SONG Chao-Peng, LI Zhuo-Xin, LI Guo-Dong

2010, 21(14):  1752-1757. 

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This paper focused on toughening mechanism of weld metal for self-shielded flux-cored wire after a review of development history of self-shielded flux-cored wire.Toughness impact of inclusion depended on its shape and sizes.Circular inclusion ranging from 0.2 to 1.0μm has a tendency to form AF core and

 is favorable for toughness improvement.To maintain the relatively higher toughness, optimum ratio of aluminum to oxygen in weld metal is 0.84. The additions of trace element such as Li,Zr,Ti,B,Ni and Ce in flux-cored wire help to improve weld impact toughness.In addition, droplet transfer modes and formation mechanism of spatter was also summarized.

State-of-the-art of Micro Cutting Tool and Its Related Technologies 

LIU Zhi-Bing, WANG Xi-Ban

2010, 21(14):  1758-1763. 

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Micro cutting tool is the key and fundamental technology of micro cutting which is an effective micro machining technology for micro structure made of multi-materials such as metal, alloy, composite material, ceramic, glass and silicon.The state-of-the-art of micro cutting tool were reviewed herein. Design and manufacture technology of micro cutting tool were analyzed from the view point of advanced cutting tool material, design philosophy, fabrication method and coating.Furthermore, related technologies such as

adjustment, deflection compensation, tool condition monitoring, tool path optimization as well as characteristics, mechanism and estimation of wear and breakage of micro cutting tool were introduced.