Table of Content

25 March 2008, Volume 19 Issue 6

Previous Issue    Next Issue

Research on Impact Characteristics of Cutting Monolayer Oil and Gas Pipeline with Underwater Diamond Wire Saw

]Meng Qingxin;Wang Haibo;Jia Peng;Zhang Lan

2008, 19(6):  0-644. 

Asbtract ( )   PDF (5780KB) ( )  

Related Articles | Metrics

After the motion process of string bead was analysed,
motion equation of all partles in the string bead wire was established when string bead impact pipe wall.Displacement and velocity variation patterns of all partles in string bead wire were simulated with finite element transient dynamics analytical method，and additive stress of string bead wire in different axial position was calculated．Through test observation，much strenuous impact is generated in the course of cutting process，the cutting time prolonges greatly，and the cross-section level degree is much low，comparing with cutting combined pipe.Test demonstrates that increasing string bead quantity of per meter
string bead wire can decrease impact action．

null

Zhou Xiangyang;Chen Liping;Huang Zhengdong

2008, 19(6):  0-750. 

Asbtract ( )   PDF (4427KB) ( )  

References | Related Articles | Metrics

null

Adaptive and Robust Control of Coordinated Motion of Dual-Arm Space Robot System

Guo Yishen;Chen Li

2008, 19(6):  0-644. 

Asbtract ( )   PDF (3178KB) ( )  

Related Articles | Metrics

The adaptive and robust control problems of dual-arm space
robot system without the base’s position control were discussed.Firstly,the
underactuated dynamics equation of the system was derived through the Lagrangian formulation.Based on the above dynamics equation and with the augmentation approach,the inputs and outputs of the system were expanded properly to overcome the difficulty of nonlinear parameterization in the dynamics equation of the full-controlled system.And then with unknown and uncertain parameters of the payloads hold by the two end-effectors,the adaptive and robust
control schemes of coordinated motion between the base’s attitude and the arm’s
joints were developed.The simulation results indicate that the two control schemes can efficiently eliminate the effect of the unknown and uncertain parameters on the system and control the base’s attitude and the arm’s joints to track the desired trajectories accurately.

Experimental Research on Microelectroforming with Ultrasound Stirring

Ming Pingmei,;Zhu Di;Hu Yangyang; Zeng Yongbin

2008, 19(6):  0-750. 

Asbtract ( )   PDF (11881KB) ( )  

Related Articles | Metrics

A number of microelectroforming experiments assisted with ultrasound stirring were carried out to verify and revise the optimum processing parameters,and some metal microdevices were produced.Experimental results show that fewer microdefects such as nubbles,pinholes,roundings,and collapses in the microelectroforms and smoother surface are observed when ultrasound stirring with power intensity
12W/cm2~14W/cm² is drawn on. Microelectroforming assisted with ultrasound
stirring at appropriate power intensity is characterized by better topograhpy and better
uniform filling behavior.

Investigation on Axial Vibration of Crankshaft Based on Rayleigh Differential Method

Liang Xingyu;Shu Gequn;Zhang Baohuan;Wang Yangjun; Chen Daliang

2008, 19(6):  0-644. 

Asbtract ( )   PDF (4548KB) ( )  

Related Articles | Metrics

This paper presented the principle and method of calculation for the axial vibration based on Rayleigh differential method of crankshaft for a high speed diesel engine.At first, the internal combustion engine crankshaft was simplified to a continuous stepped shaft model and the kinetic formulas of shafts and masses were constructed.
By means of the Lagrange formulation, the motion equation of torsional vibration and axial vibration were deduced. According to coupling principle and coupled excitation of the shafting system,a model of axial forced vibration can be constructed. Using a vector matrix,a single order or a whole system vibration can be analyzed. With a newly designed testing
set-up, the axial vibration of the crankshaft at the free-end of a 4-cylinder diesel engine
were measured.Compared with the practical measurement results,the calculated results are in agreement in main order.

Study on Extrusion Process and Die Design System Based on KBE

Zhao Zude;Gu Junhua;Liu Chuanlin;Huang Shaodong;Chen Jun

2008, 19(6):  0-750. 

Asbtract ( )   PDF (5220KB) ( )  

Related Articles | Metrics

Based on the design concept and method of knowledge based engineering, the extrusion process and die intelligent design system was developed on the platform of UG/NX. Key technologies such as open knowledge base, feature modeling,reasoning algorithms combining case-based reasoning & rule-based reasoning and DFV(design for variety)-based die structure design platform were researched. Especially, the application of RCCR reasoning mode and DFV-aided techniques significantly improve the process and die design efficiency. Design for the selected case was conducted to demonstrate the functionalities.

Study on Surface Roughness of Part in the Micro-end-milling Process

Zhang Lin;Zhao Dongbiao;Zhang Jianming ;Yang Zhifu

2008, 19(6):  0-644. 

Asbtract ( )   PDF (3959KB) ( )  

Related Articles | Metrics

The influence was presented under micro-slots end milling conditions on surface roughness of the part using a miniaturized CNC milling machine tool.A series of experiments were conducted in order to characterize the factors affecting surface roughness and to determine the range of attainable surface roughness values. The machining factors studied were feed per tooth, cutting speed, and depth of cut. The interaction effect of factors on surface roughness was analyzed to determine which parameter was the most influential on surface roughness. It appears from the surface roughness traces of the parts that run-out has a significant effect on the surface roughness of micro-end-milled parts as well as on the dimensional accuracy of parts, and that improving machine tool run-out will have a very significant effect on the surface quality of micro-end-milled features.

Study on Modeling of a Novel Active Isolation System

Cao Qingsong,;Li Weijia

2008, 19(6):  0-750. 

Asbtract ( )   PDF (3767KB) ( )  

Related Articles | Metrics

The active flexible isolation system was composed of flexible
structures with certain shapes,where the piezoelectric elements were bonded.The system’s model was gained by Hamilton principle,in which the active flexible isolation system was simplified by beam element with electric DOFs and space conversion matrix.The system dynamic response was calculated through mode superposition method and the frequency response function matrix was gained from the system equation.The experimental results of response function demonstrate validity of the presented method and settle a good base for the controller.

Spectrum Analysis of Void Content in Carbon Fibre Reinforced Composite Materials Based on Pulse Echo Method

Jiang Zhifeng;Wu Ruiming;Wu Zuolun

2008, 19(6):  0-644. 

Asbtract ( )   PDF (4208KB) ( )  

Related Articles | Metrics

A new method based on pulse echo method was proposed for nondestructive testing of void content of carbon fibre reinforced composite material.In order
to analyze void content test,spectrum analysis method and experimental demarcate method were introduced.The paper established spectrum analysis model.Feature parameter of spectrum analysis based on pulse echo method was discussed.The experiment validates the implementation and realization of the method are effective.

Research on Fully Automated Machine for Separation of Blood Components

Yao Yufeng;Huang Bo;Wang Jianwei;Jiang Jindong

2008, 19(6):  0-750. 

Asbtract ( )   PDF (4372KB) ( )  

Related Articles | Metrics

Aimed at the great domestic demands of blood components
and all the prepared devices in service were imported, an automatic blood
component separation system was developed.The system was comprised of PC and separation-machine
communicated by CAN bus,a special software HIT-WG-A was installed in the PC,which was responsible for separation programs and process data management;multi-region optics sensors and special extrusion mechanism were adopted by separation-machine,which could automatically separate Double Blood bag/Triple blood bag/Quadruple blood bag apart to components.Pilot production and experiments testify the performance and application value of the system are fine.

Study on the Self-adaption Accumulator Circuit Absorbing Pressure Pulsation

Cao Shuping;Luo Xiaohui;Hu Junhua;Zhang Chaona

2008, 19(6):  0-644. 

Asbtract ( )   PDF (4296KB) ( )  

Related Articles | Metrics

The mathematical model of common accumulator circuit absorbing pressure pulsation was built firstly.Whereafter,the influence of flow pulsation rate and steady pressure of system on the effect of accumulator absorbing pressure pulsation was analyzed theoretically.On this foundation,a model of self-adaption accumulator circuit absorbing pressure pulsation was presented.This model utilized the information about flow pulsation rate and steady pressure of system,which were collected by pressure sensor,to regulate the sectional area of the anterior pipeline of accumulator,namely the natural frequency of accumulator.Thereby,the good effect absorbing pressure pulsation could be obtained.The results of simulation and test reveal that the self-adaption accumulator circuit
can absorb the pressure pulsation well when the flow pulsation rate and steady pressure of system change,and hold the ability of self adaption.

Analysis and Control of Nonlinear Errors for [STHZ]5-axis Machining
of a Hybrid Machine Tool

Shi Hong;Cai Guangqi;Li Jingkui

2008, 19(6):  0-750. 

Asbtract ( )   PDF (3727KB) ( )  

Related Articles | Metrics

The analysis of nonlinear errors of the 3-TPS
hybrid machine tool on 5-axis machining and the reduction of the error by self-adaptation linearization were introduced herein. The obtained formula for nonlinear errors can be used in different situations and to estimate three-dimensional cutter evelope forming error.The 3-TPS hybrid machine tool can achieve 3-axis,4-axis,5-axis,vertical and horizontal machining.

Research on Key Techniques of Augmented Reality Maintenance Guiding System

Zhao Xincan;Zuo Hongfu;Xu Xingmin 

2008, 19(6):  0-644. 

Asbtract ( )   PDF (4831KB) ( )  

Related Articles | Metrics

Based on analysing the difference between virtual maintenance and AR maintenance guiding system,the principles of AR maintenance guiding system were introduced.AR system for training and assisting was presented and some key digital maintenance techniques were discussed.Taking the typical aero-engine maintenance work
in the outside field as an example,combining the basic wearable maintenance aid theory
and the augmented reality technology,a personified and intelligent maintenance aid system was developed.The research results show that the augmented reality maintenance guiding system will play an important role in aircraft maintenance.

Product Configuration Model Based on SML

Zhang Fen;Chen Zhuoning;Yan Xiaoguang;Bin Hongzan

2008, 19(6):  0-750. 

Asbtract ( )   PDF (4462KB) ( )  

Related Articles | Metrics

Based on the GBOM(generic bill of materials),a product configuration model was established by adopting tabular layout of article characteristics(SML).In the
model,every part or assembly was abstracted as a component,every component encapsulated a SML to define various characteristics of the component.The relationships among the parts or assembles were transferred to the constraints,associative relations and parameter propagating of the characteristics of the SML.The model is devoted to the development and application of product configuration software by combining product deign method and software implementation.

Identification of Material Parameters of Thin-walled Steel Tube by Inverse Method

]Liu Dihui;Wang Chen;Li Guangyao

2008, 19(6):  0-644. 

Asbtract ( )   PDF (4588KB) ( )  

Related Articles | Metrics

A method to acquire the material parameters of thin-walled tube
was suggested, which combined the FEM and genetic algorithm.First, a simulation model was built,and the program to calculate material parameters was developed.Second, the convergence of this program was studied. Third, the experimental equipment was built,and
the experiment was carried out. Then using the date acquired in the experiments and the program developed,the material parameters of the tube were acquired. Forth,the parameters were verified by another experiment and simulation. Using the parameters calculated by the inverse method can improve the precision of total car simulation.Material parameters of other tubes can also be acquired by this method.

Research on Mold Collaborative Design Based on CAD Command Stream Multicast

Wang Chengyong,;Liu Quankun;Hu Longfei;Hu Chengliang

2008, 19(6):  0-750. 

Asbtract ( )   PDF (5282KB) ( )  

Related Articles | Metrics

With the requirement analysis of mould distributed collaborative
design,a scheme of CAD command stream multicast was presented to realize “human-human interaction”and “computer-computer interaction” in the mold expert group.The command stream extracting and encapsulating of homogeneous CAD and heterogeneous CAD were discussed.A unified user data format of DatagramPacket which included the command stream was designed.The multicast middleware which was developed based on Java Multicast separated the commands into two kinds:one was feature editing,the other was 3D navigating.The system used double tokens to control the multicast rights and the concurrent operations.A demonstration was given to examine the above system.The procedure of sharing design parameters and mold standard parts from mold base was
described.

Statistical State Recognition of Mechanical Equipment Using Empirical Mode Decomposition

Wang Xue;Ma Junjie;Wang Sheng

2008, 19(6):  0-644. 

Asbtract ( )   PDF (4274KB) ( )  

Related Articles | Metrics

A state recognition method for mechanical equipment was proposed,combining empirical mode decomposition and
Mahalanobis-Taguchi system which was based on statistics.First,empirical mode decomposition performed adaptive analysis on equipment monitoring signal to obtain its feature.Focused on mass normal signal samples and few abnormal ones,statistics method implemented recognition and diagnosis of mechanical equipment.Experimental results verify that equipment states are extracted and recognized efficiently by empirical mode decomposition and Mahalanobis-Taguchi system,and the recognition accuracy is enhanced.

Experimentation on the Superficial Residual Stresses Generated by High-speed Milling Aluminum Alloy

Tang Zhitao;Liu Zhanqiang;Ai Xing

2008, 19(6):  0-750. 

Asbtract ( )   PDF (4400KB) ( )  

Related Articles | Metrics

The superficial residual stresses in milling aluminium alloy were measured by the Doelle-Hauk method.The measurement results show that the principal plane is approximately in parallel with the machined surface of the workpiece, which reveals that the stresses are under two-dimensional plane stress state.To eliminate the effects of the texture on the stress measurement accuracy,X-ray diffraction method with ψ-oscillation and
-oscillation were employed.This paper studied the superficial
residual stresses distributions resulting from milling aluminum alloy.Particular attention was paid to the influence of measurement location and cutting
speed.In order to explain the formation mechanism of milling residual
stresses,the orthogonal components of the cutting forces were measured
using a Kistler 9257A type three-component piezoelectric dynamometer.The
temperature fields of the machined workpiece surface were obtained by finite element method.At last,the formation of the residual stresses can be explained by thermo-mechanical coupling effects.

Surface Defection and Damage Analysis of KDP Crystal Grinding

Wu Dongjiang;Cao Xiansuo;Gao Hang;Kang Renke

2008, 19(6):  0-644. 

Asbtract ( )   PDF (7683KB) ( )  

Related Articles | Metrics

Processing KDP crystal with grinding method,the optic microscope,ZYGO three-dimensional surface profile measurement,scanning electron microscope were used to study the surface defection and damage analysis of ground KDP crystal.
The results show that the materials remove with brittleness wipe off mainly,and have
great nick and brittleness crash on the surface of gound KDP crystal.

Research on RCCC Mechanism Function Generation by Using Numerical Atlas Method

Sun Jianwei;Chu Jinkui;Wei Jing

2008, 19(6):  0-750. 

Asbtract ( )   PDF (4146KB) ( )  

Related Articles | Metrics

The input-output function of the RCCC mechanism was studied by using Fourier series method.The relationship
between the harmonic component of the input-output function and the dimensional type of the RCCC mechanism was discovered.The basic dimensional type was determined by finding out the dimensions of the mechanism which had effect on the harmonic component of the input-output function.The numerical Atlas database comprising fifty millions basic dimensional types were set up.Through setting up the numerical Atlas database and gave the concrete steps of function generator,made the function synthesis of RCCC mechanism be possible.Finally,an example was given to verify the feasibility and the validity of the approach.

Optimization of Dynamic Characteristics of Airbag Based on Genetic Algorithm

Liu Xin;Han Xu;Wen Guilin

2008, 19(6):  0-635. 

Asbtract ( )   PDF (3555KB) ( )  

Related Articles | Metrics

The dynamics model of the airbag was developed based on the dimensional analytical method. An optimization procedure based on the genetic
algorithm was proposed to search the key parameters such as the area of vent, initial pressure and height of the airbag dynamic characteristics.The experimental results demonstrate that the proposed method gives an optimal design of airbag with reducing experimental times and cutting down experimental cost.The method can also be used in the field of other airdrop protections.

Experimental Research on the Fluid Two-dimensional Vibration Machining Technology 

Yu Zhaoqin;Guo Zhongning;Huang Zhigang;Hunag Xiaozhou

2008, 19(6):  0-750. 

Asbtract ( )   PDF (5194KB) ( )  

Related Articles | Metrics

A novel polishing technique based on the two-dimensional vibration of fluid was put forward. It provided ultrasonic vibration from both horizontal and vertical directions for
the liquid at same time and supplied two-dimensional high-frequency vibration as the polishing power for the workpiece.A set of experimental equipment had been developed.
This equipment was composed of the liquid slot,the planet device, the adjustment device and so on.The influences of particle size, concentration of polishing liquid,polishing time,
and vibration parameters to polishing quality were discussed by series of processing experiments to the optical glass.

A Class of 6-DOF Parallel Kinematic Structures and Structure Analysis

Shen Huiping;Yang Tingli;Ma Lüzhong

2008, 19(6):  0-635. 

Asbtract ( )   PDF (3313KB) ( )  

Related Articles | Metrics

This paper analyzed the structure and their characteristics of a class of six-DOF parallel mechanisms. In details, the analyses included the calculation of mechanism DOF, motion output characteristic analysis, complexity of kinematics and dynamics, coupling analysis between input and output, actuator choice. They can provide scientific foundations for the kinematics and dynamics analyses and mechanical structure design as well as their potential applications on virtual axis machine tools, coordinate measure machine (CMM), parallel entertainment platform and robots.

Experiment and Evaluation of Laser Dressing Diamond Grinding Wheel by
Side Blowing 

Wang Xuyue;Xu Yunfei;Xu wenji;Wang Lianji;Kang Renke;Guo Dongming

2008, 19(6):  0-750. 

Asbtract ( )   PDF (5755KB) ( )  

Related Articles | Metrics

The methods to dress diamond grinding wheel using assistant side blowing and to measure grinding force with simplifying process were presented,in which grinding force,grinding force ratio and specific
grinding energy were computed and the comparison between the results before and after laser dressing verified the effectiveness of laser dressing from different aspects.The variation rule of grinding force was explained with surface topographies of wheel and workpiece.The results show that with assistant side blowing the phenomenon of bond re-solidification can be reduced,
the grinding force decreases 5%～7% and its grinding capability is improved effectively.

Superplastic Forming and Accuracy of Denture Base Made of Ti-6Al-4V Alloy

Jiang Shaosong;Zhang Kaifeng

2008, 19(6):  0-635. 

Asbtract ( )   PDF (5481KB) ( )  

Related Articles | Metrics

Superplastic forming for Ti-6Al-4V denture base was studied and the fabrication accuracy was also investigated.The ceramic die used to fabricate
the denture base was made by mixing the green of ZrO₂ and TiO₂ with PVA and press them into oral cavity model to get the semi-finished ceramic die.Then it was sintered at 1300℃ for 3 hours in the atmosphere to produce the finished ceramic die with the complicated oral shape and enough strength for superplastic forming.The 08mm Ti-6Al-4V
sheet was blow formed to be denture base at 925℃.The average thickness of denture
base framework has 21% reduction compared with the original sheet by superplastic forming.The accuracy of Ti-6Al-4V denture base framework was also investigated using the impression measuring method.Difference between the denture base and the ceramic die
almost does not affect the accuracy and the thickness distribution of denture base also satisfies ordinary clinical requirements.

Microstructure Optimization of Heavy Forgings Based on Composite
Design

He Xiaoming;Lai Xinmin;Yu Zhongqi

2008, 19(6):  0-750. 

Asbtract ( )   PDF (3433KB) ( )  

Related Articles | Metrics

In order to control the microstructure of heavy
forgings,an optimization method based on composite design and numerical
simulation was proposed.Temperature and speed of die were taken as design variables,uniform and small microstructure of final forging was considered into the objective function.Approximate function relationship was built between
the function and design variables,optimal forging process parameters were acquired based on the regressive model.This optimization method was verified by applying it to two-step upsetting cylinder.This method combines the
advantages of regression analysis and orthogonal experimental design,
avoids large number of simulations and reduces computing time,it is a guide
to control the microstructure of heavy forgings.

Rear-end Collision Simulation and Improvement of Structural Crashworthiness

Zhu Ping;Xiao Guofeng;Zhang Yu;Shi Yuliang

2008, 19(6):  0-635. 

Asbtract ( )   PDF (5589KB) ( )  

Related Articles | Metrics

Based on a certain local manufactured passenger car,simulation of the rear-end collision was done following the rules of GB 20072-2006.It was also concluded some analysis and evaluation with respect to the impact performance of the car. Some structures in the rear tail and rear apron were redesigned,which had effectively improved the vehicle rear impact performance and fuel system safety.All of the above researches will offer a feasible method in the research of vehicle rear-end collision simulation and improving the vehicle rear crashworthiness in the future.

Numerical Simulation of Rectangular Crosssection Billets Forging with Horizontal V-shaped Anvils

Ni Liyong;Zhang Yongjun; Yu Suoqing;Liu Zhubai

2008, 19(6):  0-750. 

Asbtract ( )   PDF (2738KB) ( )  

Related Articles | Metrics

The forging method with horizontal V-shaped anvils(HVA) was introduced to control fibrous tissue flow direction,to improve the anisotropy of mechanical properties of axial forgings.The forging method is superior to the common flat anvils(FA) forging method in inner stress states,metal tissue,overall properties and geometrical shapes of forgings.Numerical simulation comparison was conducted for the HVA forging method and the FA forging method,verifying the fact that the HVA forging method is
an effective process to control the mechanical properties of axial forgings.

Experimental Research on the ABS Performance Based on 
the Wheel Forces Measured by Roadway Test

Zhang Xiaolong,;Feng Nenglian;Zhang Weigong

2008, 19(6):  0-635. 

Asbtract ( )   PDF (3841KB) ( )  

Related Articles | Metrics

This paper primarily studied the estimation methods and index of ABS based on the wheel forces measured by
wheel force transducer during the straight-in-line emerging braking.Firstly,the self-developed wheel force transducer and the vehicle roadway test system
were developed,and based on these,a homemade passenger car was employed to go through systematic road way tests on one test ground.The tests
belong to emergent braking,and both the brake initial velocity and the ABS
switch on/off states are controlled.Secondly,the comparative analysis on
these test results were made,and several distinguishing evaluation index on
the ABS performance were put forward.This research offers the quantitative
analysis evidence for the research and development of the ABS device.

Application of Reverse Engineering in the Car Roof Multi-point Forming

Pei Yongsheng;Wang Liandong; Ruan Shijie

2008, 19(6):  0-750. 

Asbtract ( )   PDF (4042KB) ( )  

Related Articles | Metrics

With the Passat 1.8T roof as an example,this paper
reconstructed its 3D curved surface by applying reverse engineering,
and studied the technique of car roof multi-point forming(MPF) on the basis of car roof 3D curved surface. By the method of reverse engineering,we got the 3D curved surface approximately identical to the real car roof object.
The forming surface is approximately similar to the real car roof object in the car roof MPF process.Consequently，it establishes certain base for applications of the technique of MPF in automobile outer panels punch forming process.