Table of Content

25 August 2011, Volume 22 Issue 16

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Research on Meshing Track and Polygon Effect of a New Silent Chain with Inner Meshing Mechanism

MENG Fan-Zhong, DONG Cheng-Guo, FENG Ceng-Ming, CHENG E-Bing

2011, 22(16):  1891-1895. 

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Based on analysis of the meshing mechanism of a new round-pin jointed silent chain with inner meshing mechanism,the a mathematic model of the inner meshing mechanism silent chain meshing with

different stage was developed based on the coordinate transformation theory.The meshing track of the inner meshing mechanism silent chain was obtained by least-squares fitting, and the motion trail and fluctuation quantity of the chain's tight side between the new inner meshing silent chain and the

traditional outer meshing silent chain were compared and analyzed.The experimental results on a high-speed bench and the calculation results show that the characteristics of the new inner meshing mechanism silent chain include little vibration,low noise,smooth transportation,good wear resistance etc.

Geometric Theory for a Translational Rotary Compressor

HU Xu-1, JUE Zong-Chang-1, XU Mo-Na-2, SUN Jin-Ju-1

2011, 22(16):  1896-1900. 

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This paper presented a new frame rotary type compressor,

named translational rotary compressor to overcome the large friction energy loss and the sever wear of structure of other compressor.The compressor was made up of fixed

cylinder,swing vane and translational rotor.During the whole cycle, the procedure of inflow, compress, air discharge operated continuously in the working chamber formed by the inside surface of cylinder, vane and the outside surface of bladed rotor. Thereby, the working state is smooth. The operation principles,structure characteristics and geometric theory of this mechanism were formulated and analyzed, and the calculation formulae for displacement volume, chamber pressure and thermodynamic properties were deduced.The analysis results show that this mechanism is of simple structure, no wearing parts, easily airtight, slight friction and lower cost; and fits for various fluids.

Conceptual Design and Dimensional Synthesis of a Novel 5-DOF Hybrid Manipulator

LI Ban-1, 2, HUANG Tian-1, ZHANG Li-Min-1, DIAO Xin-Hua-2

2011, 22(16):  1900-1905. 

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A novel 5 degree-of-freedom(DOF) hybrid manipulator were presented. The manipulator was composed of a 3-DOF parallel mechanism which was serially connected with a 2-DOF rotating head. On the basis of the formulation of the overall Jacobian matrix of the parallel mechanism, the mapping characteristics among the external force and moment applied on the moving platform and actuation and constraint forces of the links were investigated, and a transmission capability index was proposed for minimizing the maximum actuation and constraint forces of the links for a given set of external force and moment. Dimensional synthesis of the 3-DOF parallel mechanism was carried out under various geometrical and performance constrains in term of global conditioning index, linear velocity and accuracy for a given task space. The results of the optimal kenimatic design were given via examples.

Dual-loop Integral Sliding Mode Control for Flexible Space Manipulator

LIANG Cha, CHEN Li

2011, 22(16):  1906-1912. 

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This paper discussed the trajectory tracking and vibration suppression control problems of free-floating flexible space manipulator with an attitude controlled base. With the law of conservation of momentum, the Lagrangian principle was utilized to model the dynamics function of the flexible space manipulator incorporating the assumed modes method. Using singular perturbation theory, a slow subsystem describing the rigid motion and a fast subsystem corresponding to the flexible motion were obtained. Then, a composite controller for coordinated motion between the base's attitude and the manipulator's joints of flexible space manipulator system was designed. The slow-subsystem dual-loop integral sliding mode controller dominated the trajectory tracking of coordinated motion in the presence of unknown parameters. The fast-subsystem controller damped out the vibration of the flexible link by hierarchical fuzzy logic controller. Numerical simulation results illustrate that the proposed controller is reliable and effective.

New Low Cycle Fatigue Damage Accumulation Model and Experimental Results

ZHANG Lei, YANG Zi-Chun, CAO Ti-Yun-

2011, 22(16):  1912-1915. 

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Based on the theory of continuum damage mechanics,a new low cycle fatigue damage model was established, which combined the unseparable

characteristics of the damage variables and loading parameters. Through the analysis of test data of the low cycle fatigue damage of steel 00Cr17Ni14Mo2 and 2.25Cr1Mo,the fatigue damage evolution equations under different plastic strain amplitudes were acquired,which are in good agreement with the experimental results.While the constants of new low cycle fatigue damage model were obtained by fitting,two fatigue damage evolution equations of steel 00Cr17Ni14Mo2 and 2.25Cr1Mo were given respectively.And comparing with several fatigue damage accumulation models,the results show that except linear damage accumulation model,the rest of the models could reflect the nonlinear damage accumulation process of material.The new model established herein accords the experimental results best, which truly reflects the nonlinear damage accumulation process,and takes the coupling of damage and strain, fatigue limit, mean pressure into consideration.Therefore, the new damage model has a clear physical meaning and practical value.

Optimization Design of Vitrified CBN Wheel Structure in Super High-speed Grinding

ZHANG Jing-Jiang-1, WANG Gui-He-1, 2, XU Tian-Biao-1, WANG Wan-Shan-1

2011, 22(16):  1916-1921,1928. 

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An optimization objective was set up to control the radial displacement and to reduce the equivalent stress of the super high-speed grinding wheel. By established models for the connection between inner micro-unit's displacement and stress of wheel base, strength check of the theoretical formula about variable cross-section wheel was also established. A finite element analysis method was used to optimize wheel base type and material. The wheel pneumatic power and flow field temperature under ultra-high speed situation were also analyzed. Taking into account the characteristics of segment wheel, wheel segments number and thickness were optimized. The study has shown that the hyperbolic-type titanium alloy base wheel has a clear advantages to restrain the radial expansion and the average equivalent stress of wheel while its segments number and size have proper certain optimization value.

Analysis of Nonlinear Dynamics in a Spur Gear Pair System

SU Cheng, YIN Peng-Peng

2011, 22(16):  1922-1928. 

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A nonlinear dynamics model for a spur gear pair system was established where the backlash, the time-varying stiffness and the transmission error were considered. The nonlinear single-degree-of-freedom equations were solved by employing variable step size Runge-Kutta integration method. The nonlinear dynamics characteristics of the system were discussed for different system parameters and classified based on bifurcation diagrams, phase portraits, Poincaré maps and Fourier spectra. The chaotic motion was obtained. By means of analyzing the variation law of dynamic load, the relations between transformation process and backlash in the engaging state, which varies among the states of non-impact, single sided impact and double-sided impact, of gear system were discussed.

Contact Analysis of Stranded Wire between Adjacent Layers

DIAO Xin-Ze, GAO Wei, QIN Gong-Ling

2011, 22(16):  1929-1933. 

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A general fretting contact model of stranded wires between adjacent layers was established by using finite element method, and LGJ150/25 type

ACSR(aluminium conductor steel reinforced) transmission lines were taken as the research object. According to the stress features of its strands, the influence of fretting parameters such as contact pressure, axial tension, friction factor etc. on stress distribution in the contact area was analyzed. The results show that the contact region between the aluminum stranded wires has an elliptic shape. When the load is smaller, its elastic deformation

is mainly at the contact area, the complex stress and normal contact stress decrease from the center to the edge. With the increase of applied load, the contact aluminum stranded wires transform from the elastic deformation into plastic deformation, and then on the edge of the contact area it appears larger stress concentration than that on the edge of the central zone. The finite element analysis is proved effective when contrasts with experimental results.

Study on Spool Squeeze Film Damper of a Larger Flow Rate High-speed On/Off Valve

JIANG Hai-Bing-1, 2, RUAN Jian-1

2011, 22(16):  1933-1937. 

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A new type squeeze film damper was designed to reduce the spool's impact and vibration in a two-stage larger flow rate high-speed on/off valve with the 450L/min flow rate and 8ms turn-off time. The valve spool was buffered in tail process with aid of the damper's nonlinear reaction thrust and nonlinear damp. The valve's impact strength decreases largely and vibration disappears under conditions that response speed does not drop, and the valve's sealing performance,reliability and service life improve largely. The simulation and experimental results show:the damper has optimum buffering performance when oil film thickness is 0.1mm, and the spool closing process approaches ideal. The valve will has a great potential application in the powerful occasions because of it has perfect performance: larger flow rate,fast response and novel damper. The study achievements will have important theoretical and practical significance to develop new hydraulic components.

PML Boundary Conditions for Full Euler Equations

LIU Tie-Xin, GAO Bin, TONG Zhi-Yong

2011, 22(16):  1938-1941,1948. 

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The transformation coefficient of the PML boundary condition for linearized Euler equations was first deduced herein.Then PML boundary conditions for full Euler-equations in both Cartesian and cylindrical coordinate systems were presented.

It is shown that PML Equations for linearized Euler equations are only special cases of those for full Euler equations. Finally, the PML equations for full Euler equations were validated by computing the flow field of the inlet of jet engine in which PML was imposed as outflow boundary conditions.

Workflow Management System Oriented Multi-granularity Component Organization

LI Hai-Bei

2011, 22(16):  1942-1948. 

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Efficiency of ESA(enterprise software and application) constructed by software component depends on functional factors, and non-functional ones which is often neglected. In order to improve efficiency of component reuse, by analyzing how business frequency and its change influenced on components' execute load, and relationship between component granularity and component reuse, then merging business frequency that was one of the non-functional factor into component library composition, an approach of multi-granularity component library composition and corresponding algorithms were proposed. A practical example and analysis of component reuse efficiency show that the approach of multi-granularity composition can keep component reuse efficiency maximal completely, as well as ESAs no matter how business frequency is changing.

An Adaptive Ant Colony Optimization for Solving Assembly Line Balancing Problem

DENG Fu-Beng, ZHANG Chao-Yong, LIAN Kun-Lei, XU Chao-Tan

2011, 22(16):  1949-1953,1959. 

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An adaptive ant colony optimization was proposed to solve

the assembly line balancing problem(ALBP).According to the characteristics of

the ALBP,a method of solution constructing strategy was developed,and a better differentiation of objective function was proposed to appraisal solution quality.However,general ant algorithm often falls into local optimal and consume excessive time, in order to overcome these shortcoming,an improved ACO was presented by adaptive adjustment of the parameters in the algorithm, which has a good ability of searching better solution at higher convergence speed. Finally, the proposed algorithm was tested and compared against best known algorithms reported in the literatures, and the experimental results indicate the feasibility and effectiveness of the proposed algorithm.

AR Bispectrum Analysis of Block Forming Machine's Hydraulic Vibrate Signals

TUN Fu-Sen, HUANG Yi-Jian-

2011, 22(16):  1954-1959. 

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To find out a new type of hydraulic vibration, the differential

cylinders were used to drive the vibration of the platform in the block forming machine.The signals of displacement in vibration process during the test were collected and the time series AR model of bispectrum was built. It turns out that,in different working conditions,

the bispectrum amplitude and the comparison of autocorrelation power spectrum and reconstruction power spectrum are applied to obtain the information of the signal's

non-Gaussian,nonlinear characteristics which are very important for us to select the optimum working parameters of the vibration system.

Decomposition Method of WBS Based on PBS for Complex Products

HE Miao-1, YANG Hai-Cheng-1, 2, JING Dan-Kai-1

2011, 22(16):  1960-1964. 

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In order to ensure the complete work breakdown,a decomposition method of WBS for complex products was presented. The PBS was the source of WBS in the decomposition of work. By the analysis of mapping type, definition of mapping model, preparation of mapping matrix and establishment of mapping rules, the data transform from PBS to WBS was completed. Based on this method, it is rapid to construct the WBS view and effectively to ensure the accurate conversion from PBS to WBS. And a prototype system was developed. Finally, an application example of the work decomposition of launch vehicle was provided to validate the correctness and feasibility of this method.

Research on Screening Efficiency Based on AR Model of High-order Cumulant LS-SVM

SHI Zheng-Zhong, HUANG Yi-Jian

2011, 22(16):  1965-1969. 

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An AR model with high-order cumulant was built by the vibration signals which were collected during the screening of the self-synchronization probability sieve. A screen efficiency predicting model was established by using the coefficients of

the AR model as the input variables of a LS-SVM model.The real-time monitoring

was made during the screening of sieve by the way combining AR model with LS-SVM.

Study on Design and Mechanics Properties of Beetle's Elytra-inspired Lightweight Structures with Filament Winding

ZHOU Yi, GUO Ce, SHU Chun-Sheng, DAI Zhen-Dong

2011, 22(16):  1969-1973. 

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Based on the microstructure of the cross section of a beetle's elytra, one compound material of bio-inspired lightweight structures was designed.Three kinds of mechanics properties of the lightweight structures were studied with FEM.At the same time, quasi-static compression experiments on the structure models were carried out. The experimental results and the FEA results were compared and analyzed,which proved the effectiveness of the FEA.The mechanics properties of two kinds of finament-wound structure were compared，the results proving the bionic structure of two layer staggered fiber design are reasonable.

Research on Method for Building Variant Design Knowledge Base

JIAO Hu, MO Rong, CHEN Chao, GONG Zhong-Wei

2011, 22(16):  1974-1980. 

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The knowledge of the variant design process according to the characteristics of variant design was classified and the sub-knowledge bases consisting of knowledge instances were built. The concept of knowledge instances consisting of knowledge elements related to the variant design process was proposed, and the method for establishing common knowledge base of variant design was put forward. Last, an application example shows that the proposed method is validate.

Research on Shape Variation Disciplinarian of Scroll Profiles Based on Functional Theory

WANG Li-Cun-1, 2, ZHANG Xian-Meng-1, CHEN Guo-Jiang-1, WANG Xu-Dong-1, LUO Li-Pei-3, CHEN Ban-1

2011, 22(16):  1980-1983. 

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Using geometric theory of general scroll profile based on functional analysis, aiming at the compression ratio and volume utilization coefficient

as the objective function,the shape variation disciplinarian and convergent series of a

general scroll profile were obtained based on functional theory. The wall thickness of scroll profile is variable when series items k≥3. Revolution radius(R),

diameter tape(D),laps(N) and series items (k) are the main

 factors influening on the compression ratio. The scroll profile model of best

convergent series were established, using genetic algorithm based on MATLAB.The optimal goal value of the given conditions were obtained,and the best scroll profile equation

were presented.

Multi-camera Layout Design on Large Scope Visual Inspection and Its Data Registration

CA Yong-1, QIN Xian-Sheng-1, ZHANG Xue-Feng-1, ZHANG Pei-Pei-1, CHAN Ning-2

2011, 22(16):  1984-1987. 

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To inspect large objects by multi-vision, the cameras needed

be moved or rotated their positions and view angles to get large area inspection results.

It was proposed a method that the location and attitude of cameras were arranged in

advance to cover large area object.First,the best precision and clarity zone of binocular cameras were specified.Then,three constraints of layout were given. Based on parallel arrangement, the layouts of cameras were performed outside a plane.

The data obtained in plane layout of cameras was registered by a high resolution camera outside overlapped area which detected agency calibration target.At last, the

 registration experiments were carried out by two calibration boards. The results show that the largest registration area is 1.98m×1.30m, in which, it can be arranged over 40 binoculars. The calibration error is less than 0.07mm,and the registration error is less than 0.1mm. The results meet the needs of large area visual inspection. The presented method is a resolution of conflict between large scope and high precision.

Research on DBA of Strength for a Plate-fin Heat Exchanger Header

WANG Wei-1, CHEN Liang-1, HE Fu-Jun-2

2011, 22(16):  1988-1992. 

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A direct route by combining the PWC(plastic work curvature) criterion and the nonlinear FEA technology,was adopted to calculate the plastic internal pressure and the plastic piping loads of an industrial header product, and the calculated results were compared with that of other methods. The comparisons show that the PWC plastic pressure load results of perfect-plastic analysis are very close to the Cloud-Rodabaugh limit pressure result and the ASME limit pressure result; the PWC plastic loads are characterized by reflecting the structural strengthening effect of the material strain-hardening on the header by using the plastic work as the global indicator of plastic collapse mechanism, and avoids the arbitrary of users' experience to select an appropriate deformation parameters for determining the TES(twice elastic slope) plastic loads; the direct route is advantageous of convenient calculation by avoiding the cumbering elastic stress categorization procedure. In summary, the direct method based on the PWC criterion is an effective approach to solving the strength DBA problem of the plate-fin heat exchanger header with complicated structure.    

Optimization of Fiber Steering in Composite Laminates Using a Curve Projection Algorithm

LEI Min, ZHOU Lai-Shui, WANG Xiao-Beng

2011, 22(16):  1993-1996. 

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Planning fiber placement paths according to the distribution of principal stress can reduce the amount of composite materials and enhance the strength of structure. First,a series of key points were picked out corresponding to the stress distribution;second,these points were moved along a particular direction and fitted to curves; then they were projected to surfaces and generated the fiber-placement paths; at last,a mapping method was used to create distance curve for the tow number determination. The path trajectories passed through all the target points and retained G1 continuity. Further more, they were generated from offset surfaces for multi-layer placement. Explicit formulae were derived to compute paths, and the proposed method is verified to be simple and rapid with surface examples.

Application of New Optimization Method Based on Quasi-optimization Strategy in Vehicle Lightweight

GU Ji-Chao, LI Guang-Yao, AN Nian-Fei, WANG Guo-Chun

2011, 22(16):  1997-2000. 

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Vehicle lightweight designs are often defined as an optimization process with large design space and large number of design variables.To solve this type of problems,a quasi-optimization strategy which should cooperate with an optimization method was proposed. With the proposed strategy, the design space and design variables will be gradually reduced by analyzing the former optimization results.Application of the proposed strategy cooperating with hybrid and adaptive metamodel based global optimization method in rear frame system lightweight design demonstrates its effective,where

the weight of the rear frame is reduced in all three optimization process.Besides, the shortcomings were also discussed.

Sensitivity-based Analysis of Light Weighting and Fatigue Life Estimation for Truck Frame

WANG Shu-Ting, LIU Chi, TUN Xi-Zhong, JIN Guo-Dong

2011, 22(16):  2001-2006. 

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 In order to achieve the light weight design of a truck frame, the stiffness sensitivity, mode sensitivity and the compensative sensitivity of static and dynamic structural response were carried out using the size optimization technology. Finally, the total life, crack initiation life and crack growth life were analyzed. An unabridged digital analysis system for truck frame will be accomplished by joining with other digital design technologies namely structural topology optimization , multi-body dynamics simulation and finite element analysis of truck frame.

Research on Forecasting of Vehicle Driving Posture Based on AR Model Theory

LUO Dan, WANG Lei, SHU Li

2011, 22(16):  2006-2010. 

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This paper adopted time series AR model to forecast vehicle motion parameters, and represent the model in detail. In addition, using roll velocity as an example which is an important parameter in vehicle driving to discuss the application of AR model in active safety. The results show that the forecasting method has achieved some effectivenesses. Furthermore, AR method just makes use of its own historical data to build models and forecast. Therefore, they have virtues of briefness, convenience, universality.

Development of Electric Rear Wheel Compliance Steering System for Rhombic Vehicle

TUN Jue-Mo, HUANG Zhi, ZHONG Zhi-Hua

2011, 22(16):  2011-2015. 

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Based on the analysis of the disadvantages of a mechanical

steering transmission mechanism installed on the rhombic vehicle，such as its complicated mechanism and its layout problem, a scheme for electric compliance steering

system(ECSS) was presented and the structure and working principles of ECSS were

introduced.An ECSS simulation model was established in Simulink, by the method of zero-angle controlling strategy the proportion of rear-wheel steering servo coefficient was determined and the stimulation analysis for the effect of the ECSS on the vehicle under the stepping steering condition was carried on. The simulation indicates that by adopting the ECSS, the high speed manipulating stability of the rhombic vehicle is improved. The model of ECSS was made and the main function of it was tested in vehicle.

The test results indicate that the ECSS can realize the rear wheel quickly, accurately,

and complete stable compliance steering control.