bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Force Analysis of a Roller-Type Garbage Sorting Equipment
Authors: Cui Zhao Xia , Du Heng Jie , Zhao Yu Zhu , Guo Si Jia
Published: February 2011

The rapid growth of municipal solid waste (MSW) brings huge social and environmental pressures to our country, the treatment method of making garbage reduction, hazard-free and reclamation is accord with environmental protection and continuable development, and the key question of achieving this goal is to sort the garbage reasonably. On the basis of analyzing the characteristics of garbage, a new kind of roller-type urban living garbage sorting equipment was developed based on a special movement principle of cam mechanism proposed in this paper. This equipment can realize its function through a fixed cam axis, more than eighty sets of garbage separating needle assemblies reasonably distributed on the roller, in which needles (followers) can move in and out of the roller, and an active roller which rotates around the cam axis together with the needle assembles. As the core components of the equipment, cam mechanism and separating needle assembly was designed in detail, including the cam contour curve and force analysis, and the distribution of stress and strain of separating needles was obtained by using ANSYS software because it is the most easily damaged link in this equipment. The roller-type garbage sorting equipment can be used in the middle stage of garbage separation process to sort easily hooking garbage such as plastic, with higher separation speed and efficiency. It makes a good preparation for subsequent garbage separation work to improve the efficiency of comprehensive utilization of resources.
Reliability Assessment for a Certain Diesel Engine Based on Performance Degradation Data
Authors: Feng Fu Zhou , Xing Wei , Si Ai Wei , Wu Guang Ping
Published: February 2011

Reliability of equipment has long been considered as an important quality characteristic. Traditional methods of equipment reliability assessment are based on lifetime data. With equipment being much more reliable and the growing need for developing new equipments within shorter period and at lower cost, we can hardly get enough lifetime data in many cases. Performance degradation data can also be used for reliability assessment. This paper is mainly researched on reliability of a certain diesel engine. Through analyzing the failure mode and failure mechanism, performance degradation parameters of the diesel engine is selected as compression pressure in a cylinder while driven by an electrical motor. Based on a long time accumulation on performance degradation data, two methods of degradation path fitting and degradation value distribution are tried in this paper to evaluate reliability of the diesel engine. Besides, the regulation of the reliability variation is given by the results of the assessment.
Dynamic Reliability Sensitivity Design of Mechanical Components with Arbitrary Distribution Parameters
Authors: Wang Xin Gang , Wang Bao Yan , Zhu Li Sha , Lu Hao
Published: February 2011

The variation rules of strength, load, and reliability of mechanical components are studied with a change in time, and a model is established for dynamic reliability of mechanical components under the random load acting. By combining the theory of reliability design with the method of sensitivity analysis, the computational method of dynamic reliability sensitivity design with arbitrary distribution parameter is proposed based on the methods Edgeworth and perturbation, and the problem of dynamic reliability sensitivity design of mechanical components distributed arbitrary distribution is solved as well as the variation rules of dynamic reliability sensitivity are given. The variation of reliability is studied as design parameters change a little, which provides theoretical data for dynamic reliability design of mechanical components.
Out-Plane Stability of Derrick of Inclined Drilling Rig
Authors: Zhao Guang Hui , Liang Zheng , Jiang Fa Guang , Tian Jia Lin , Zhang Liang
Published: February 2011

K-type derrick of inclined drilling rig that is top driving is usually loaded by axial compression, lateral force and concentrated torque simultaneously, and is more prone to out-plane instability due to its poor torsional rigidity. Here the upper segment of derrick was simplified as cantilever beam-column with laced-bar lattice structure. Stability model was established by energy method, and Ritz method was employed to obtain deformation curves for lateral deflection and torsion. Effects of dip angle of derrick and position of top drive on deformation were analyzed. At last the out-plane instability process of derrick is presented by increasing longitudinal compressive force gradually. For ultimate loads of well drilling condition, out-plane stability requirement of derrick is met.
Study on Reliability for Vehicle Skeleton under the Action of Road Spectrum
Authors: Zhang Da Qian , Zhao Wei Tao , Qin Lian Fang
Published: February 2011

Theories of transfer function are use to describe how to calculate random response of vehicle skeleton under road spectrum in this paper. First passage fail model combing with the basic theory of structural reliability, the calculation formula of dynamic strength reliability for vehicle skeleton is presented. Strength reliability for a bus body skeleton is solved by 13936 samples of Monte-Carlo Method when the bus is running on the C level road at a velocity of 80 km/h. The results of the numerical example show that the dynamic strength failure probability for the bus body skeleton is 8.90524×10-4 and corresponding reliability is 99.9991095%.
Maintenance for Improving Manufacturing Equipments Availability Using Prognostics and Health Management
Authors: Long Jiang , Jiang Wei An
Published: February 2011

There is a growing need for improving manufacturing equipments availability to achieve high levels of productivity. As a key complement to CBM and RCM, PHM is becoming a key enabler for achieving cost effective ultra-reliability and availability in tomorrow’s manufacturing equipments at an affordable cost. Based on traditional maintenance strategies, key issues pertaining to PHM application to manufacturing equipments, including health monitoring, diagnostics and prognostics, are discussed in this paper. As an example, a method for dynamic MFOP based maintenance strategy optimization using PHM and RUL estimation is presented.
Fatigue Reliability Copula Model of Structural Systems with Fatigue Life Correlation
Authors: Han Wen Qin , Zhou Jin Yu
Published: February 2011

It is the common characteristic of most engineering systems that failure statistical correlation of elements exists in the fatigue happened process due to the twin loads．Based on randomized Basquin equation，the constitutive relations between element life and twin loads，initial strength,fatigue strength exponent are established．Product-moment correlation coefficients are derived and used to quantify the dependence of logarithm life of elements．Aim at fatigue life correlation of elements in structural systems, the computation model of the system reliability is preliminarily established by means of using copula function. The new model can express the dependence of elements fatigue life in structural systems, can be used probability prediction of structural systems under common stochastic cyclic load, which gives a new path for reliability-based design and probability assesment in equipment systems with multi-mode damage coupling．
Influence of Casing Inner Wall Corrosion on Internal Pressure Strength
Authors: Xu Zhi Qian , Yan Xiang Zhen , Yang Xiu Juan
Published: February 2011

Considering the differences of pressure and temperature along well depth, the distribution law of casing inner wall corrosion rate was calculated with the Norsok model. According to the measured pressure values, the law of well pressure changing with the time can be obtained with the empirical method or the derivative curve method. Then the changing laws of the corrosion rate and the thickness reduction of casing inner wall are derived during the casing service life. Finally, the time-varying characteristic of casing internal pressure strength influenced by corrosion is researched.
Parameter Estimations of Inverse Weibull Distribution
Authors: Yan Wei An , Song Bao Wei , Mao Zhao Yong , Le Huang Yong
Published: February 2011

under entropy loss function, the E-Bayes estimation and empirical bayes estimation to the parameter of inverse Weibull distribution used conjugate prior are discussed. And we prove the empirical bayes estimation is asymptotically optimal. At last, the MSE of the estimations are compared based on Monte Carlo simulation study. According to these comparisons, it is suggested that the accuracy of E-Bayes estimation is close to the empirical bayes estimation.
Micro Analysis in Healing Area of Inner Crack for a 45 Steel
Authors: Zhang Yong Jun , Han Jing Tao , Liu Jing , Yu Wan Hua , Wang Hui Feng
Published: February 2011

Healing processing of the samples of a 45 steel was carried out. The healing area of inner cracks in the sample made by method “Drilling – Compressing” was observed and analyzed. SEM and FESEM analysis displayed that the microstructure in healing area is should be was mainly ferrite, and ferrite grain growth across the interface of inner crack, and there exists should be exist many polyangular grains of several hundreds nanometer in ferrite of healing area. Vickers-hardness test showed that the hardness of ferrite in healing area is should be was higher than that in matrix, which may result from the strengthening of polyangular grains.
Fault Diagnosis for Rolling Bearing Based on Genetic-SVM Classifier
Authors: Xu Yun Jie
Published: February 2011

Fault diagnosis of roller bearings is very complex, so it is difficult to use the mathematical model to describe their faults. Whose developmental changes have dual trends of increase and fluctuation. In this study, support vector machine trained by genetic algorithm based on high frequency demodulation analysis is proposed to fault diagnosis of ball bearing. Genetic algorithm is used to determine training parameters of support vector machine in this model, which can optimize the support vector machine (SVM) an intelligent diagnostic model. The performance of the GSVM system proposed in this study is evaluated by roller bearings in the wood-wool production device. The experimental results indicate that the proposed support vector machine trained by genetic algorithm has good diagnosis results in the application.
A Study on the Accelerated Life Test for Hydraulic Cylinders
Authors: Han Guo Hui , Fu Yong Ling
Published: February 2011

The approach to estimating the life-stress model and the model parameters for X-series hydraulic cylinders was studied, and the theories and statistical methods related to the reliability index under normal stress were reproduced precisely through the accelerated life test. With temperature and velocity as the accelerated stress, the accelerated life test for hydraulic cylinders was implemented, and data acquisition was conducted. Statistication, assessment and transformation were performed on the test data with statistical models related to the theory. The transformation results of the reliability information from the accelerated life test reproduced precisely the reliability index of hydraulic cylinders at the temperature of 308K and the velocity of 0.25m/s (normal stress), and the test period was shortened to one fifth.
Friction and Wear of Typical Tool Material at Elevated Temperature
Authors: Zhang Hui , Deng Jian Xin , Wu Ze , Ai Xing , Zhao Jun
Published: February 2011

The friction and wear behavior of cutting tool materials keeps an issue. In this study, an high temperature tribometre (UMT-2) was used to investigated the tribology properties and mechanism of two kinds of typical cutting tool materials. Commonly used cemented carbide (ZU5) and ceramic (AT) were chosen. The characteristics as to wear rate, friction coefficient and worn surface were studied. From the results, we found that the ceramic had better wear resistance than the cemented carbide. The friction coefficient of cemented carbide decreased with the increase of ambient temperature while the ceramic exhibited an inverse tendency. Finally, the probable wear mechanism was discussed.
The Friction and Wear Behaviors of 3-(N-di-n-butylaminomethyl) Quinazolin-4-Ones in Liquid Paraffin
Authors: Ping Ou Yang , Zhang Xian Ming
Published: February 2011

A heterocyclic derivative of 3-(N-di-n-butylaminomethyl) quinazolin-4-ones was synthesized and its tribological behavior as an ashless additve without phosphorus and sulphur in liquid paraffin was evaluated using a four-ball tester. On the basis of the experimental results, the novel additive has been found to be quite effective as a potential additive in liquid paraffin. The nature of the film on the rubbed surface was investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS).
Multiple Influencing Factors Analysis for Non-Conformal Contact Characteristics of Ball Screw
Authors: Wang Fu Ji , Ma Jian Wei , Jia Zhen Yuan , Yang Jiang Yuan , Song Di
Published: February 2011

The contact between balls and screw races or nut races is a kind of typical non-conformal contact. The study of contact characteristics of ball screw will provide theoretical bases for improving transmission efficiency and working properties of ball screw. In this study, hertz contact theory was adopted to construct the solution formula of ball screw’s contact stiffness, ball screw’s contact characteristics in terms of axial load, design parameters and material properties was analyzed, and the contact deformation value of the contact between ball and screw races was got using finite element simulation method. The simulation result is close to the theoretic value, which proves the correctness of the theory analysis. The present study offers theoretical support for the design and application of high speed, heavy load and precision ball screws.
Dynamic Viscosity Variation of Aqueous Solutions with Polyethoxylated Ether (PEOE) Added
Authors: Zhang Chao Hui , Liu Si Si , Liu Jun Ming
Published: February 2011

Aqueous solutions have found broad usages as lubricants, in conjunction with other possible utilizations, in metal working and other industries. Due to the inferior lubricity, functional additives are needed to improve their tribological performances, including oil-in-water (O/W) emulsions or aqueous surfactants. The rheology of aqueous solution with polyethoxylated ether added (PEOE) is measured, including the influences of the temperature and the concentration on dynamic viscosity variation. The dynamic viscosity of PEOE aqueous solutions increases with PEOE concentration. The dynamic viscosity of PEOE aqueous solutions decreases with the rise of temperature up to cloud points. If the temperature is higher than cloud points, however, the dynamic viscosity will increase, through which a non Newtonian characteristic, i.e., the shear thinning, is expressed.
Coupling Analysis of Frictional Heat under Control of Disc Brake Anti-Skid Brake System
Authors: Zhang Yi Bing , Zhang Ying Ying
Published: February 2011

The nonlinearity of material properties at different temperatures and the manner of braking force applying on a brake system are two key factors to affect the coupling of temperature and thermal stress. Considering these two factors, a finite element analysis model of automobile brake disc and pad is established. By using the model, the dynamic frictional heat and thermal stress of braking friction pair could be simulated and the coupling characters of temperature and thermal stress on friction surfaces could be studied, where the braking force is constant or controlled by an anti-skid brake system(ABS). The study results shown that the friction temperature of brake disk rises in periodic and fluctuant tendency. The fluctuant increase of temperature will influence the character of braking. The increase of friction temperature between a brake disc and pad can decrease under the control of ABS, so the effect of thermo-mechanical coupling could be reduced.
Simulation on the Wear Behavior of the Wear-Resistant Surfaces Using Discrete Element Method
Authors: Zhang Rui , Chen Guang Ming , Fan Wen Feng , Li Jian Qiao
Published: February 2011

On the basis of the discrete element method (DEM), the non-linear mechanical model of the wear-resistant body surfaces was established. The step, convexity, and scale arranged structures of the wear-resistant surfaces and their abrasive wear systems were established with the software PFC2D®. Through the qualitative analysis on the morphology, the contact-bond fields and the contact-force chains, the minor injuries and the breakaway of the debris of the wear behaviors are observed. Besides, the dynamic force acted on the wear-resistant structures was studied through the quantitative analysis. Numeral simulation shows that the step structure was worn dramatically in its tip part, the convexity structure distributes the stress prominently and the scale structure shows the best wear-resistant function. The wear loss of the front monomers of the step, convexity, and scale structures are 2.43%, 2.02%, and 1.12% respectively after being worn for eight minutes in the simulation, which are in accordance with the experimental results. The numerical simulation on the abrasive wear behavior of the biological wear-resistant structures by DEM helps to reveal the wearable mechanism of the wear-resistant surfaces. Moreover, it provides a new method for studying the bionic wear-resistant surfaces and structures.
Numerical Simulation on the Lubrication Performance of Surface Textured Piston Rings
Authors: Chang Qiu Ying , Zheng Xian Liang , Liu Qing
Published: February 2011

Surface texturing has been successfully employed in some tribological applications in order to diminish friction and wear. This technology may be used in a piston ring to decrease the friction and wear of the contact between a piston ring and cylinder liner. A numerical simulation of lubrication between a surface textured piston ring and cylinder liner based on the hydrodynamic lubrication theory was conducted. The influence of surface texture parameters on piston ring lubrication performance was obtained by solving the mathematical equations with a multi-grid method. The results show that under the micro-dimple area density of 5%-40% the minimum oil film thickness increases and the dimensionless friction force decreases with the increasing of it. Under the dimple area density of 40%-60%, the minimum oil film thickness and the dimensionless friction force change slightly. Under various dimple area densities the optimum dimple depth at the given working condition in this paper is about 5µm.
Friction and Wear Characteristics of Spherical Plain Bearings with PTFE Woven Liners
Authors: Qiu Ming , Gao Zhi Lun , Wang Guo Feng , Chen Long
Published: February 2011

The friction and wear behaviors of three kinds of spherical plain bearings with PTFE woven liners were investigated by a high oscillating frequency and heavy load tribo-tester. Dry sliding tests were carried out at an oscillating frequency of 1.2Hz and four different loads. With the help of SEM and EDS, the differences of worn surfaces of the three kinds were investigated. The results indicate that the wear depth and friction temperature for the three kinds of bearings show increasing trend with the increasing of load, while the friction coefficient is the opposite. The comprehensive performance of bearing II is the best in the whole course of experiment, while the bearing III is the worst. The adhesive and abrasive wear mechanisms are appeared on the surface of liners. The quality of boning influences the tribological property of the spherical plain bearing.
Determination Method of Angular Domain Resampling Order in Computed Order Tracking Analysis
Authors: Cong Hua , Wu Guang Ping , Feng Fu Zhou , Xing Wei
Published: February 2011

In the process of computed order tracking, traditional method is based on the given analyzed order requirements, and also assumed that the highest order component is known. But in practice, the order component in signal is usually unknown. With regards to this issue, the paper proposed a method using filter to limit frequency and order. A principle on how to choose filter cut-off frequency and angular domain resampling order are deduced in this paper, then the relationship is analyzed between filter cut-off frequency and resampling frequency in time domain. Simulated signals are tried on the method, the results show that it can solve order aliasing problem successfully, and also effectively reduce resampling order.
Propagation Character of the Stress Wave in Weld Joints
Authors: Song Hong Wei , Luo Zhen , Ao San San , Wang Rui
Published: February 2011

Stress wave test technique has broad prospects because of the long distance, large scale and relatively low cost. This paper studies the stress wave propagation characteristics in the butt weld joints in the case of external symmetrical impact. The stress wave propagating before and after the joints is measured by dynamic strain gauge. Then model analysis and simulation is applied to research stress wave. The results show the loss of stress wave is small. After spectrum analysis, the change of propagating stress wave can be detected.
Rheological Behaviors Characterization and Modeling of a Novel Three-Branched Phenylethynyl-Terminated Imide Oligomer
Authors: Liu Chang Wei , Zhao Xiao Gang , Wang Cheng Yang , Yu Xiao Hui , Jia He , Wang Shuang , Wang Da Ming , Yang Dong , Wang Yun Liang
Published: February 2011

To prepare novel polyimides with enhanced thermal stability and low melt viscosity, a novel three-branched phenylethynyl-terminated imide oligomer was introduced. The oligomer can be used to prepare high performance resin-based composite material via resin transfer molding (RTM) due to its low melt viscosity (<2Pa.s) between 250°C and 320°C. The cured resin exhibits excellent thermal stability and higher glass transition temperature than PETI series as a result of the introduction of star-branched units. In this research, the rheological properties of the oligomer were measured and numerically fit with the dual Arrhenius model to predict the progression of the viscosity during cure. The calculated kinetic activation energies for gelation with two different Arrhenius equations, 120.8kJ/mol and 164kJ/mol, respectively,had some differences. The numerical results were compared with the experimental measurements, and it was found that the model predicts the experimental observations quite well.
Investigation of Vibration on Vehicle Suspension System using Half-car-model
Authors: Sarder Mohammad Mohasin , Zahid Md. Hossain , Chowdhury Habibullah , Ovy Enaiyat Ghani
Published: February 2011

Vibration of the suspension system of a vehicle is crucial for comfort of the passenger. In this paper, a mathematical model of the suspension system is presented with half car model with four degrees of freedom. Vibration characteristics due to different pitch line excitation and different damping coefficients are investigated for heavy vehicle suspension system. The model is simulated in MATLAB SIMULINK for this investigation. ANSYS Structural software has also been used to determine the resonance frequency and mode shape of vehicle bounce and pitch motion.
Application of Acoustic Emission on Fault Diagnosis of Rolling Element Bearing
Authors: Yuan Hong Fang , Wang Peng , Wang Hua Qing
Published: February 2011

Because AE (Acoustic Emission) signals in bearing fault monitoring unavoidably mixed various noise which lead to wide band characteristics, in this paper, the collected AE signals are pre-processed by EMD (Empirical Mode Decomposition) algorithm to extract useful information in the concerned frequency range, after that, power spectrum is used to locating analysis and pattern recognition. Experiment show that this method could improve the detection accuracy in rolling element bearing fault diagnosis.
Gear Local Fault Diagnosis with Empirical Mode Decomposition and Hilbert Huang Transformation
Authors: Han Zhen Nan , Gao Jian Xin
Published: February 2011

A new method for gear local fault diagnosis based on vibration signal analysis is presented in this paper by using the concept of instantaneous frequency. The data from the physical simulation are used to detect the change in the instantaneous frequency and meshing vibration energy of the gear tooth fault by Empirical Mode Decomposition and Hilbert Huang Transformation (EMD-HHT). It is verified that method is effective by rig testing of geared system.
Load Model of Small Parameter Scroll Wrap for Bending Fatigue Strength in a Scroll Compressor
Authors: Shao Bing
Published: February 2011

The pressures and the temperatures in compression chambers are analyzed, and a load model including the pressure loads and the temperatures is proposed. For the small parameter scroll wraps, the pressure loads can be simplified on the mid-areas and the temperatures are equal to the temperatures of the mid-areas. The pressure loads are of π-region pressures which have a normal angle interval of π, the number of acting regions for pressure loads is equal to the number of scroll compression chamber pairs. Apart from the part situated in the center compression chamber, the temperatures of scroll wrap decrease linearly with the normal angle. Selecting the reasonable discharge, specifying the appropriate material and the parameters, and modifying the starting part of scroll wrap are significant methods to improve fatigue strength of scroll wraps in practice.
Amplitude Incremental Complementary Energy Principle for Nonlinear Vibration of Elastic System
Authors: Liu Zong Min , Sun Bai Tao , Mao Ji Ze , Zhang Yuan Yuan
Published: February 2011

All actual vibration systems are nonlinear in character. For nonlinear vibration problems, IHB method is an effective definite quantitative method. The theoretical foundation of IHB method is amplitude incremental variational principle. In this paper, amplitude incremental complementary energy principle for nonlinear vibration is established.
An Optimization Approach of a Seeker's Optomechanical System under Random Vibration by Using Integrated Structural/Optical Numerical Simulation
Authors: Guo Xin Min , Kang Wei Min , Zhao Jie
Published: February 2011

The random vibration will cause a severe decline of the dynamic imaging quality if the seeker’s optomechanical system has not been properly optimized. Firstly, based on the integrated optomechanical analyzing method and the requirement of the seeker, an optimization approach utilizing the numerical simulation is presented. Then an optimization design of the support position, in which the optical modulation transfer function is as the optimal target, was processed under the random vibration with high-accelerator in a wide frequency range (10 GRMS). The simulation result shows that the optimum structure has a better performance than the other available structures in dynamic imaging quality: the degradation of optical modulation transfer function is less than 0.5% in central field of view and about 8.25% in the full relative field of view.
Wavelet Method to Extract Shock Signal of Debris Flow
Authors: Chen Hong Kai , Tang Hong Mei , Zhang Yu Ping , He Xiao Ying
Published: February 2011

The shock signal’s fluctuation characteristics of debris flow stem from two aspects, one is the composition of debris flow with the solid and the liquid, another is the surging property of debris flow in motion. Based on the initial shock signals collected in model experiment in laboratory, 9 shock spectrum levels are decomposed by the db8 wavelet method, i.e., 0~0.195Hz, 0.195~ 0.391Hz, 0.391~0.781Hz, 0.781~1.5625Hz, 1.563~3.125Hz, 3.125~ 6.25Hz, 6.25~12.5 Hz, 12.5~25Hz, and 25~50Hz. Taking the peak each shock spectrum as the standard, the energy distribution curves of 9 shock spectrum levels are obtained. These curves display that the shock energy of debris flow focus on the low frequency smaller than 1.0Hz, and the percentage below 6.25Hz is about 95%. The results provide a reference to select wallop peak as the design load of structures against debris flow disaster.
Study on Design Method for Magneto-Rheological Fluid Damper Based on Squeeze Mode and Experimental Tests
Authors: Liao Chang Rong , Fu Li Juan , Yang Ying
Published: February 2011

A Magneto-rheological(MR) fluid damper based on squeeze model is put forward. The squeeze flow differential equation is obtained. Navier slip condition is considered on two boundary surfaces and compatible condition is established. The radial velocity profile and the radial pressure distributions are derived respectively. The mathematical expression of damping force is devloped. In order to verify rationality of analytical method, MR fluid damper based on squeeze mode is designed and fabricated according to technical requirements of engine vibration isolation system. The experimental damping forces from MTS870 Electro-hydraulic Servo with sine wave excitation show that analytical method proposed in this paper is feasible and has the reference value to design MR fluid damper based on squeeze mode.
Study on Modal Properties of Continuous Active Structures
Authors: Li Ning , Cheng Li
Published: February 2011

The modal properties of continuous active structures are studied in this paper. The reciprocity theorem is derived and presents the relationship between the two co-adjoint active structures. The modal orthogonality conditions of the active plate and active beam with distributed sensor and actuator are developed. The continuous active structures and their adjoint active structures have the same eigenvalves, and their modes are weighted orthogonal. The present study concludes that the modes of active structures are related to the control law, measurement and actuation configurations. As a numerical example a rectangular plate was calculated to give the notes about modes of the active structures.
Analysis on Bistable Response of a Disk-Rod-Fastening Rotor
Authors: Cheng Li , Qian Zheng Wen , Chen Wei
Published: February 2011

In the view of the fault of bistable response appeared in the disk-rod-fastening rotor, the peculiar structure of this kind rotor was taken into account in this paper. By considering the influence of contact effect of discontinuous interfaces on the rotor stiffness, the tie-rod and the contact surface between the wheel disks were equated to a bending resistance spring with nonlinear stiffness. Then the equation of motion of the disk-rod-fastening rotor was put forward according to this simplification. The vibration characteristics of rotor was calculated by the harmonic balance method that combined with the predict-correct and homotopy arithmetic. The bistable response behaviors recurred in this simplified model was much closer to the measured results in flying. The study showed that the nonlinear factor of stiffness, resulted from the contact effect of discontinuous interfaces, was the main reason which led to the appearance of bistable response in the disk-rod-fastening rotor.
A Simulation Research on the Noise and Flow of Vehicle Cooling Fans
Authors: Yuan Zhao Cheng , Zhao Fu Quan , Chen Hai Bo , Ma Jia Yi
Published: February 2011

This paper optimized the design of the cooling fans of a light-duty diesel engine through numerical simulation. Using Fluent as a platform, a detailed Computational fluid dynamics (CFD) model was developed to simulate both the aerodynamic and the acoustics performance. The model developed was validated against experimental data obtained in this research. The validated model was then used to optimize the design of the cooling fan aiming to minimize the operation noise. With the guarantee of cooling performances, the aerodynamic noise of the two fans has been successfully reduced.
An Experiment Investigation to the Effect on Measurement Precision of Torsional Vibration
Authors: Yuan Zhao Cheng , Wu Cheng Ming , Ma Yi Ja , Li Xiao Feng
Published: February 2011

Tortional vibration is a common phenomena in the rotary machine such as internal combustion engine. The measurement of tortional vibration is an usual test in the engine experiments. In this paper, the influences of some parameters of measurement instruments such as teeth number and diameter of gear wheel were investigated by experiment approach. Some useful results to guarantee the precision of measurement were obtained.
The Hydraulic Jack-Up System Design on the Ocean Petroleum Platform 161 - the First Self-Installing Product Platforms in China
Authors: Li De Tang , Tian Hai Qing , Wang Yue Pai , Huang Yuan Yu
Published: February 2011

The paper introduces the hydraulic jack-up system design about the first domestic self-installing product platform. According to the production platform features, the jack-up system chooses the mode of hydraulic cylinder driving. So the jack-up system is both economy and safe reliability. The jack-up system is equipped with proportional valve and the PLC programmable controller which has a touch panel to show the inclination of the platform, the synchronism of hydraulic cylinders in the four legs of the platform, the state of the piston pin and the alarm indication of the hydraulic power station etc.
Effect of Ampicillin as Bacteriostats on the Performance of Phosphate Solubilizing Rhizobium. Meliloti Inoculants
Authors: Li Jian Feng , Zhang Shu Qing , Shi Shang Li , Huo Ping Hui , Chen Li Yu
Published: February 2011

The aim of this study was to evaluate the effect of Ampicillin as bacteriostats on the number of P solubilizing and antibiotic-anti-Rhizobium. meliloticells and contamination in inoculants during one year storage, and plant promotion ability of subgeneration cells of antibiotic-resistant phosphate-solubilizing R. meliloti strain LW107 growth on YMA plates containing different concentrations of ampicillin were also investigated. In the first experiment, 100 mg liter-1 ampicillin was added in inoculants, number of R.meliloticells and contamination in inoculants were investigated at two temperatures, using both liquid and peat based solid inoculants in experiment. Statistical design was a complete randomized block in a factorial 2×2×2 experimental arrangement with 4 replicates. Results show that there are various viable cells and contamination levels in inoculants. The ampicillin increased R.melilotiLW107 viable cells and inoculants stored at low temperature with lesser contamination when ampicillin been added. To clarify whether ampicillin affect the main character of R.melilotiLW107 cells, the ability of calcium phosphate solubilization and IAA production in ampicillin-containing conditions was determined. Results indicated that the ability of calcium phosphate solubilization and IAA production have no significant difference on 6th generation cells of R.melilotiLW107 between the growth plates and the lack of ampicillin. In the third experiment, the plant growth promotion of the ampicillin-containing inoculants on alfalfa seedlings was determined in sterile sand conditions in a temperature-controlled growth chamber at 20 -25°C for 35 days. We also found that no significant difference on nodule numbers between diluted liquids ampicillin-containing inoculants and the common liquid inoculants containing no ampicillin, but plant growth and efficiency of nitrogen-fixing responded to undiluted liquids inoculants containing ampicillin with a decrease in biomass and nitrogenase activity indicating that the five-fold dilutions of the ampicillin-containing inoculants are necessary for applications.
Optimization Design of Biscuit Formula Based on the Grey System
Authors: Li Wei , Li De Yuan
Published: February 2011

Biscuits are popular with many people, including young and old man. In present, much attention is paid to biscuits taste and flavor, but proportion of protein from different material in biscuits is usually ignored. It results in less nutrition value. This can be improved by increasing protein biological value through proper mixture of different protein resources. The best optimization proportion of different material protein is quantitatively determined through mathematics model and the application of computer technology. This model is applied in the formula design of biscuit made of wheat flour protein, soybean protein and milk protein, the result is as follows: wheat flour protein: soybean protein: milk protein＝11:5:7.
Study on Operation Management of Producing Service Company for Manufacturing Enterprise
Authors: Han Liang , Du Rong
Published: February 2011

Based on the value chain of manufacturing enterprise, this paper puts forward the producing service framework for manufacturing enterprise. Then for manufacturing enterprise’s producing service, three kinds of typical operation modes, which are self-management service, service outsourcing and collaboration service, are analyzed. Base on the above analysis, a producing service industrialization model is introduced, which includes demand of producing service, modular service, service evaluation and integration. Then the paper studies the corresponding operation management of producing service from the four aspects.
A Production Planning Model for Make-To-Order Companies with Capacity Constraint
Authors: Gao Hua Li , Dan Bin , Jing You Guo
Published: February 2011

This paper proposes a decision-making model of the planning quantity put into production for Make-To-Order (MTO) companies with capacity constraint. The low repeatability and the uncertain products eligibility-rate of the MTO production systems are fully taken into account, and an optimal solution is presented. Finally, a numerical example is given to illustrate the validity of the model.
Optimize the Transit Vehicle Routing for the Emergency Evacuation
Authors: Chen De Ai , Xu Wang Tu , Zhang Wei
Published: February 2011

This paper concentrates on modeling the vehicle routing to develop an evacuation plan for transit-dependent residents during emergency situation. Planning of transit route in the evacuation is formulated as a vehicle routing problem with time windows (VRPTW). An intelligent algorithm, in which genetic algorithm is embedded with simulated annealing is developed to solve the optimization model. A real evacuation network on which 19 pick-up points and 4 shelters are distributed is used to study the proposed evacuation strategy. The relevant results show the feasibility of the mathematical model as well as the efficiency of the solving algorithm.
An Systematic Modeling and Simulation Study on WIP Optimization in Semiconductor Assembly and Test Factory
Authors: Ni Yan Ting , Li Jing Min , He Wei , Yao Jin
Published: February 2011

The simulation, modeling and analysis of manufacturing systems for performance improvement have become increasingly important during the last few decades. This paper presents a practical solution to a manageable and well distributed work in process (WIP) control system with simulation experiment demonstrated by constructing the virtual production lines, addressing issues such as wafer kitting strategy, critical work in process level setting. The simulation WIP instances are coordinated and synchronized with production line influence factors and activities imported. Through the testing and actual practice, this simulation tool helps semiconductor assembly and test factory production managers effectively manage work-in-process (WIP) levels to compensate the impact of unexpected production variations and achieve better factory performance.
Based on Adjacent Cross-Coupling of Multi-Motor Synchronous Drive
Authors: Zhang Peng , Zhang Jian Hua , He Dong Sheng , Zhang Ben
Published: February 2011

In this study, a new multi-motor synchronous based on adjacent coupling error and sliding mode theory is designed, the tracking error and synchronization error convergence which are proved very well by Lyapunoy theory and LaSalle's Invariance Principle, Simulation results of the synchronized system shows that the synchronization controller can effectively achieve the synchronization with a quick convergence rate and good robustness.
Development Simulator for Operation of Kanban System
Authors: Oh Beom Seok , Park Jaiil
Published: February 2011

Kanban is the method for operation control as tools that decrease stocks. Kanban can control over stocks Just-In-Time which is effective system in repressing the over stocks. In this research, we studied method of operation using Kanban simulator and this paper has a purpose to design for Kanban System.
Holistic Design Concept in the Application of Wine Packaging
Authors: Zhao Hong , Yu Xiao Min , Bao Shu Fang
Published: February 2011

From the packaging concept,this article analyzes the transportation of wine packaging, buffer, sales, etc,put forward measures to realize goal of the collection of wine packaging. In the condition of low cost designation, the designers use cardboard, glue, etc,to show the technical ability structure itself and artistic glamour. The realization of aesthetic value, which reflects we pay close attention to the social ecological. We hope it will provide some reference in promoting the development of the internationalization of wine packaging industry.
Component Variant Design Method Integrating Dimension and Tolerance
Authors: Kuang Bing , Xiao Li Zhi , Liu Fu Yun , Sun Yong Hou
Published: February 2011

Product variant design is one of the key technologies of Manufacturing Enterprise for responding market demand. During the product variant design, tolerance variant design plays an important role. However, tolerance variant design is considered rarely in the researches of product variant design. To solve the problem of tolerance design in product variant design, a component variant design method integrating dimension and tolerance is presented in this paper. The fundamental and implement of component dimension variant design is introduced. Through analyze the conventional tolerance design method; the status for tolerance variant with its implemental dimension is marked as fixed tolerance value, fixed tolerance grade and tolerance value variant with special regular. The equation of dimensional tolerance variants with the value of implemental dimension is presented. So the procedure of component variant design method integrating dimension and tolerance is proposed. Finally, a case study of output shaft of reducer illustrates the implemental process of proposed method. Result comparing with conventional method shows effectiveness of proposed method.
Tensegrity Form-Finding Using Finite Particle Method
Authors: Xu Xian , Yu Ying , Luo Yao Zhi , Shen Yan Bin
Published: February 2011

In this paper, a new method, so-called finite particle method, for form-finding of tensegrity systems is proposed. It models the analyzed domain by finite particles instead of mathematical functions and continuous bodies in traditional mechanics. Examples including simple regular tensegrity systems and complex irregular tensegrity systems are carried out to verify the feasibility and effectiveness of the method. Also a comparison between the proposed method and the dynamic relaxation method is conducted. It proves that the proposed method is much more effective than the dynamic relaxation method in the form-finding of large-scale tensegrity systems. Hence, the proposed method has a great potential of developing into a general and effective form-finding method for irregular and large-scale tensegrity systems.
A Digital Near Net Shape Manufacturing Propeller with Complex Surface
Authors: Jiao Zhong Fei , Yao Shan , Zhao Shu Ming , Zeng Feng , Wu Di
Published: February 2011

An integrated digital routine is applied in the near net shape manufacturing of marine propeller. Firstly, the 3D CAD file of propeller is created by parametric modeling. Secondly, the propeller casting process is simulated using CAE software, through which an optimized casting scheme is obtained. Thirdly, fabricates the mold using laser rapid prototyping and cast the metal propeller. Finally, evaluate the casting precision performance. CAD, CAE and CAM are integrated in this process. The dimensional accuracy of the final piece is controlled within 1mm and its surface roughness achieves Ra 6.3μm. The result shows that the pattern-less casting of propeller can be achieved by this method, reducing cost and performing high accuracy.
Taking the Pulse of Subsea Trees Design towards Deepwater Application
Authors: Ding Kuang , Zhu Hong Wu , Zhang Jin Ya , Kong Xiang Ling , Wang Chuan
Published: February 2011

The challenges facing the subsea production system are becoming increasingly complex with hydrocarbon production moves into deep and even ultra-deep waters. As the most critical equipments, subsea trees need to be designed synchronously against the increasing technology gaps. This paper highlights the common considerations for subsea trees design, especially the horizontal Xmas tree, towards future deepwater application, and the main contents consists of structure design combined with subsea seal technology and the important thermal design in terms of insulation materials selection and application, numerical simulation. Meanwhile, some suggestions and application cases are also included in this paper.
Finite Element Analysis for Analog Modes of SCS Series Truck Scale with Different Loads
Authors: Shi Wei Tao , Li Jian , He Jun
Published: February 2011

The weighing platform of the truck scale is a load-bearer, which is used for bearing a load. Its structure has many forms, in this paper, the finite element analysis of a structure with u-beam which is currently the most widely used for different loading modes, the traditional method of structural analysis of truck scale is to simplily the platform as a simply supported beam. As the model is too simplified, the result of this method will be unreliable and it cannot make part analysis about stress and strain . In this research, ANSYS was used to model, and loaded analysis. Through different loading, get the structure of weighing platform stress distribution and deformation. By analysing,we give reasonable proposals and provide valuable reference for the design and production of truck scale .
Optimum Design of Wheeled Loader's Steering Rubber Buffer Seat Based on ANSYS
Authors: Wang Hu Qi , Xiao Xuan , Luo Xi Rong
Published: February 2011

Steering rubber buffer seat of loader is one of important methods to enhance the operating comfort of machine. This article detailed identified the design variables, constraint functions and the objective function of the rubber buffer seat's optimal design model. It combined with project experience and based on the analysis of rubber buffer seat's bearing features in the right, and established the correct mathematical model of optimal design in theory. Then, based on ANSYS software's optimized design module "Design Opt", completed set of all calculated parameters by the operations of alternate interface, thus created a rubber buffer seat's finite element model of optimization calculation. Optimized iterative calculations later, got the result of the final optimized design. After the optimized design, rubber buffer seat has been used in the market volume, it's very useful, so this design method is proved correct and reasonable.