bluuebunny/crossref_metadata_2025 huggingface dataset:
A Monitoring System for Residential Quarter Security Based on Wireless Sensor Network
Authors: Li Wen , Liu Zai Wen , Xu Ji Ping
Published: October 2010

In order to monitor residential quarter security intelligently this paper designed a remote control system based on ZigBee wireless sensor network and Ethernet. According to monitor requirements about environment parameters and low energy consumption the system used 16 unit SPCE061A and 32 unit SPCE3200 separately as a key controller in sensor node and coordinator node. With the help of UZ2400 and Ethernet controller ENC28J60, it established a star network conforming to ZigBee standard and realized the functions of real-time acquisition collection, wireless remote transmission and communication on microcomputer. By collecting the information of temperature, water level, gas concentration and infrared warning the remote monitor center can know well the whole quarter safety conditions. It introduced the system structure and the designs of hardware and software. The experimental result shows that the system has high reliability, excellent real-time characteristic, extensibility and favorable apply foreground.
Optimization Design of a Piezoelectric Transduction Silicon Resonant Pressure Sensor
Authors: Nay Soe Shwe , Fan Shang Chun , Guo Zhan She
Published: October 2010

This paper presents about the optimization design of Silicon resonant pressure sensor. The new idea is the Silicon circular resonator was used as the sensing resonator. This sensor is Lead-Zinconate-Titanate (PZT) driven and the resonant frequency shift also detected by PZT. This micro resonant pressure sensor works on the principle of resonant shift caused by the change of internal stress due to applied of the external pressure. First, we analyze the numerical relation of circular resonator. Then, Finite element analysis (FEA) has been examined for optimization for the size of Si circular diaphragm, size of the PZT patches and placement of the PZT was analyzed. And the fabrication process also presented in this paper. The pressure range is 0~0.1Mpa. The resonant frequency is about 102.29 kHz and the linearity of the output frequencies shift is so good under Silicon diaphragm small deflection limited.
Fabrication of Ethanol Sensor Based on a Calixarene Derivative Coated Piezoelectric Quartz Crystal
Authors: Dai Yun Lin , Cao Zhong , Dai Yi Min , Zeng Ju Lan , Huang Wei Gang , Hu Jing Ling , He De Liang , Aoki Katsuyuki
Published: October 2010

Coating with a calixarene derivative on gold surface of AT-cut quartz crystal, a piezoelectric quartz crystal (PQC) sensing device was successfully fabricated in this paper. Among four calixarene materials, the compound of MRCT was the most efficient actively coating material for recognizing ethanol molecule based on a host-guest recognition mechanism with C—H•••π interaction. In comparison with gas-chromatography (GC) method, the calixarene based PQC device can be well used for on-line detection of the ethanol vapor in the range of 0 ~ 3000 ppm around our environment with a recovery of 92.33~105.76 %. The detection limit can be evaluated to be 3.53 ppm. Furthermore, the proposed TSM sensor possessed good selectivity, reproducibility, reversibility and high stability for practical purpose.
Attitude Estimation Algorithm of Optronics Mast Systems (OMS) Based on Fuzzy Weighted Method
Authors: Zhou Xiao Yao , Zhang Zhi Yong , Zhang Lian Chao , Fan Da Peng
Published: October 2010

A fuzzy weighted attitude estimation algorithm is proposed to settle the problem of attitude determination for Optronics Mast Systems (OMS) by combining gyros and inclinometers. Firstly, Euler representation is employed to descript attitude kinematics, and then nonlinear continuum state space model is derived, based on analysis of mathematic model of gyros and inclinometer. Secondly, EKF is used to linear and discrete the models, and a weighted measurement update equation of attitude and gyro drifts is developed under kalman Filter framework. Lastly, according to the relations between the weighted value and body motion, a weighted value determination method is proposed based on fuzzy reasoning system. The experience results show that the accuracy of attitude estimation algorithm is 0.0380. The algorithm also solves the problem of vibration disturber of inclinometer and measure error of gyros in long term.
The Refinement Effect of Al-Ti-C-RE Master Alloy Prepared by Adding Ce2O3 on Pure Al
Authors: Wang Lian Deng , Zhu Ding Yi , Wei Zhe Liang , Huang Li Guang , Song Wei , Chen Yong Lu
Published: October 2010

The effect of Ce2O3 on the fabrication of the Al-Ti-C-RE refiner prepared by adding a powder mixture of potassium titanium fluoride and carbon into the aluminum melt was studied by means of the OM, XRD, ESEM and EDAX etc. It found that the addition of Ce2O3 increases the reaction rate between the potassium titanium fluoride and carbon during the fabrication of the Al-Ti-C-RE refiner making the Al3Ti and TiC phases well distributed. Moreover, the Ce2O3 is an intensive kind of the surface activation element strongly sticking to the Al3Ti phase after reacting on the master alloy observed by ESEM, which formed a new rare earth compound phase [AlTiCe] and accelerated the synthesis rate of TiC particles. And adding 0.15wt% Al-Ti-C-RE alloy can refine the pure Al strongly and remarkably, in which the grain size of pure Al is lower than 94.2μm. When the holding time of refining exceeded the 120 minutes, the refining effect on the pure Al has not faded remarkably, which proves the Al-Ti-C-RE prepared by the Ce2O3 have long-life and stable refining effects.
Structural Optimization for Direct-Decoupling Planar Capacitive Sensor
Authors: Li Xin Xin , Wang Wen , Yu Jian Ping
Published: October 2010

To optimize the structure of posed direct-decoupling planar capacitive sensor (PCS), methods for capacitance and sensitivity computation are studied, and the structural optimization is established. Firstly, four methods are compared with to find a suitable analytical method for the calculation of posed PCS capacitance and sensitivity. Then, electrostatic field equation method are applied and under the condition of given sensitivity, PCS structural parameters, i.e. the length of side and the number of plates is optimized. Computation results indicate that electrostatic field equation method is available for the calculation of capacitance and sensitivity on one hand, and on the other hand, when the length of side of PCS plate is twice the gap of two parallel part (l≈2d )and the number of plates is seven (N=7), PCS can meet sensitivity requirement and take up the smallest dimension.
Design of Embedded Greenhouse Monitoring & Control System Based on WSN
Authors: Qin Ning Ning , Li Dong , Xu Fan , Xu Bao Guo
Published: October 2010

An embedded greenhouse monitoring & control system based on wireless sensor networks(WSN) was presented, in order to solve problems in traditional systems, such as high maintenance cost and low mobility, etc. The paper introduced the overall structure of system, and then designed the hardware architectures of core-node and sub-nodes. After that, the flow chart of nodes was programmed, based on proposing a suitable protocol of wireless communications. The life of nodes was extended obviously by adopting the sleep-wake mode.
A Kind of Linear Array CCD Drive Frequency Regulation Technology
Authors: Lu Hong , Tan Li Yong , Lei Bo , Jian Li Sha , Wang Yang , Du Fu Dan , He Qian
Published: October 2010

After analysis of the TOSHIBA Corporation's Linear CCD TCD1501D drive timing, making full use of the relationship between this chip 6 phase driving pulses. Based on Verilog language, this paper describes in detail the three kinds of different frequency CCD-driver and the circuit which can switch freely between the different driving frequencies. ALTERA Corporation's Cyclone II series FPGA chip is chose as the linear CCD driving frequency regulator. The function simulation and the timing simulation of this system is successfully achieved with the Quartus II 9.1 and ModelSim software, then the system is debugged on Amy's EP2C8Q208 FPGA / NIOS development board, the result of debugging shows CCD drive frequency adjustment system suitable the design of freely switch of the CCD different driving frequency. Experimental results show that the system can perfect drive CCD device work
Development and Fabrication of the Micro Eddy Current Sensor by Using UV-LIGA Process
Authors: Zheng Xiao Hu , Gu Feng
Published: October 2010

An analytical model of an eddy current sensor designed for noncontact distance measurement is presented. The device consists of two planar coil (driver coil and pickup coil) stacked on the magnetic core. The planar coil fabricated by UV-LIGA technology with SU-8 photoresist is illustrated, and the permalloy magnetic core electroforming process is presented also. Tested with 10-50 KHz sine signal, the output voltage of the sensing coil reached 30mv with a Ni target placed at a distance of 20μm. And the experimental showed a linear relation between the distance and output voltage within 60μm distance. The amplitude trend increases with the increasing of the frequency and amplitude of excited signal, which is according with the theory analytics. The whole size of the device is: Φ5mm×1.5mm. The results demonstrated that the device could nondestructive evaluate the distance and be easily integrated on chip, and the UV-LIGA Process could be used as a new method to fabricate the micro eddy current sensor massly.
The Research of the Ultrasonic Heat Meter Adopting a Through Structure
Authors: Nie Shi Liang , Sugi Tokio , Liao Bin
Published: October 2010

The pattern of using the household billing to promote heating energy savings has become a focus discussion in the current national energy conservation. However, based on the fact that there is so much impurities in domestic heating system pipes, the research work of the flow meter adapting to our nation has been carried out slowly. In this paper, we report a research of a V-type installation flow meter. The meter uses the through V-type arrangement ultrasonic sensor- pair. It measures the flow by the time difference method and the entrance and exit temperature of the unit by platinum resistance-pair temperature sensors. It calculates the heat consumption by k coefficient method. The flow meter has been carried on the online testing in a district of Beijing in 2009.
Development of Cylinder with Multiple Diagonal Slits for Ultrasonic Longitudinal - Torsional Vibration Turn-Milling
Authors: Zhang Yun Dian , Zhang Bing
Published: October 2010

Cylinder with multiple diagonal slits is one of the core parts of longitudinal-torsional resonance ultrasonic device. Its structure was more complex, the traditional processing processed it very difficult, and the traditional analytical methods were also difficult to make accurate description to system. The paper researched cylinder with multiple diagonal slits using experimental method, analysis of electrical discharge machining forming tools of the slits and three-dimensional modeling; developed cylinder with multiple diagonal slits, analyzed longitudinal-torsional resonance and mechanical properties of cylinder with multiple diagonal slits using finite element analysis method. Tested resonant frequency of cylinder with multiple diagonal slits with precision impedance analyzer. The finite element analysis results compared with tested results, and analysis of error between them, finite element analysis results slightly lower than the test results but the error was within the allowed range. Comparison of results and analysis of error indicated that developed cylinder with multiple diagonal slits meet requirement.
Research on Metro Vehicle Vibration with Regard to Route Conditions
Authors: Zhang Hua Chao , Zhang Xiao Dong , Cao Guang Zhong
Published: October 2010

With the development of underground rail, the problem that vehicle vibration affects the vehicle’s life-span and harms the health of the passenger has been concerned. In this paper, a vibration test system has been formed with data collecting instrument and acceleration sensors to collect the signals of the metro vehicle floor when it running at the ATO (Auto Train Operation) mode in the tunnel, Analyzing the regulation of vehicle vibration signal change that come with the change of the route condition, such as curve, slope, and so on. Obtain the relationship between the road condition and vehicle vibration. The analysis result shows that, the vehicle vibration not only be affected by the structure of the vehicle itself and the geological condition on which the track laid, but also has close relationship with the route condition.
Design of DSP Video Image Processing System Control Software
Authors: Wen Hong Yuan
Published: October 2010

In order to realize the DSP Video Image Processing System works well in the highlight environment, the system control software is designed. In this control part, the ultra-low power MSP430 single chip microcomputer (MCU) is the core, which can be programmed to control the DSP Video Image Processing System, the video A/D converter and the highlight protection circuit by the Inter-Integrated Circuit (I2C) bus. The Image Processing algorithm models can be selected. Whether the highlight protection circuit is turned on or not depends on the comparison result of the environment light and the MCU light threshold. The control program code has been debugged and tested through the MSP development board and the IAR C-SPY debugger. The result shows the DSP Video Image Processing System Control Software is ideal.
Modal Analysis of a Six-Axis Accelerometer
Authors: Li Cheng Gang , You You Peng , You Jing Jing
Published: October 2010

The undamping differential vibration equation of a six-axis accelerometer was derived based on the Lagrange equation. The theory of matrix iteration was introduced to solve the inherent frequencies and corresponding mode shapes of the six-axis accelerometer, and the theory can also avoid solving high-order differential equation which will happen in the traditional theories. The steps of matrix iteration were described in detail. It was found that every element of the system inertial matrix and stiff matrix is the function of the structure parameters in the calculation. For expanding the measuring range of the accelerometer and increasing the basic frequency, the relationship figures between the basic frequency and the structure parameters of the accelerometer were plotted by means of programming, which supplies the theoretical basis for the structure parameter optimization design of a six-axis accelerometer.
Vibration Localization Analysis of Bladed Disk with Grouped Blades
Authors: Wang Ai Lun , Sun Bo Hai , Chen Jin Bo
Published: October 2010

Vibration localization of bladed disk turns to be much complex when a number of blades are assembled into periodic groups. This work focused on natural frequency distribution and modal localization of bladed disks with grouped blades based on the lumped parameter models, and effects of the blade number in each group on natural frequency were studied. Then Monte Carlo method was applied to analyze the sensitivity of modal localization to the random mistuning of blade stiffness. The results show that the number of blades in each group influences the nature frequency of bladed disk with grouped blades, and modal localization of tuned bladed disk with grouped blades is found in the closely spaced modal region. Moreover, compared to the bladed disk with free blades, the modal localization of bladed disk with grouped blades is much less sensitive to random mistuning of blade stiffness.
Dynamic Propagation of Mode III: Crack Concerning Surfaces Subjected to Variable Moving Concentrated Loads
Authors: Jin Cheng , Ba Ying , Lin Min , Guo Bao Ke
Published: October 2010

Asymmetric dynamic propagation of mode III: crack under variable moving loads on the crack surface is investigated using the theory of complex functions. Using the approach of self-similar function, the problems are readily transformed into Riemann-Hilbert problems. The paper presents a new mechanical model for dynamic crack propagation, in which the crack is under the conditions that the variable concentrated loads Pt3/x2 and Pt/x move along x-axial with velocity β. And then, analytical solutions of stress, displacement and stress intensity factors are attained, respectively. These solutions are utilizable to attain solutions of arbitrarily complex problems, using the superposition theorem
Study on Effect of Surface Friction on the Dynamic Behaviours of Cylindrical Gear Transmission
Authors: Tang Jin Yuan , Wang Qi Bo , Luo Cai Wang
Published: October 2010

The effect of surface friction on the dynamic response of spur gear pair is investigated in this paper. Firstly, surface friction during the mesh is described briefly, and realistic time-varying tooth stiffness and realistic static transmission error are introduced. Subsequently, the differential equation of the torsional vibration of gear transmission is developed in which the realistic time-varying stiffness and realistic static transmission error are incorporated. Finally, using the numerical simulation method, the solutions in time domain and spectrum graphs of the nonlinear system are obtained. Results show that surface friction has great influences on the dynamic responses nearby the pitch point but less influences far away the pitch point. Surface friction may also bring sudden change to the dynamic responses at pitch point when the rotational speed is low.
Harmonic Response Analyses of Three Knife-Shape-Tooth Star-Wheel Loading Mechanism
Authors: Li Xiao Huo , Sha Yong Dong , Yao Ji Quan , Liu Chun Hua
Published: October 2010

In order to research dynamic natures of a three knife-shape-tooth star-wheel loading mechanism, a mechanical model and a solid model of the star-wheel loading mechanism are established by means of updated-Lagrange and ANSYS software in the paper, equivalent stress clouds and displacement responding curves of the star-wheel at different excitation frequencies are obtained through harmonic response analyses. Model analysis shown that the star-wheel loading mechanism doesn’t take place resonance when the excitation frequency locates between 1.8 and 2.4 Hz, and the star-wheel works stability when the rotation speed is from 36 r/min to 48 r/min. These conclusions from study lay a theoretical foundation for improving the design of a three knife-shape-tooth star-wheel loading mechanism and make better its dynamic behavior.
Analysis and Comparison of Contact Forces between the Constrained Tongs and the Under-Constrained Tongs
Authors: Li Qun Ming , Qin Qing Hua , Deng Hua
Published: October 2010

A comparison of contact forces between the constrained gripper and the under-constrained gripper to grip the same work-piece is analyzed. The new type heavy forging grippers with constrained rods are designed to improve the contact status. The main difference between the new grippers with constrained tongs and the traditional grippers with under-constrained tongs is that the constrained gripper has constrained rods to keep the two tongs parallel. A gripping model has been presented in which the gripping operation is equivalent to the grasp of multi-fingered robot hands with friction contact point model. The models for calculating contact forces with constrained tongs and under-constrained tongs are presented with different constraint functions based on gradient flow optimization algorithms, and the constraint functions describe the definite state of the tongs during forging operation. By comparing the simulation and experiment results of the contact and gripping forces, it shows that the contact forces are different when the gripping in different rotation angles and the contact forces with constrained tongs is much smaller than that with under-constrained tongs, especially in the vertical position.
Vibration Analysis of Composite Plate Embedded with SMA Fibers
Authors: Wang Zheng Liang , Chen Xiao Yang , Jiang En Yu , Huang Di Shan , Zhu Xiao Jin
Published: October 2010

Shape Memory Alloy(SMA)has advantages of great recovery stress and elastic modulus varied with the temperature, so it can be embedded in composite structure to active control structure deformation and vibration. In this paper, we have deducted the recovery stress at different temperature by modifying the phase-change coefficient Ω of Liang Constitutive Model[1], then base on = /E equation, the recovery stress is translated into recovery strain. By using finite element software ANSYS, the natural frequency of composite plate at influence of recovery stress can be obtained under both ends of fixed conditions at three configurations. The steady-state vibration response of the composite plate embedded SMA fibers is also simulated. The results show that recovery stress of SMA can increase the natural frequency and can suppress vibration effectively.
Research of Adaptive Vibration Control with Piezoelectric Materials
Authors: Zhang Lei , Li Dong Wei , Mao Zhi Jun
Published: October 2010

A kind of adaptive searching optimization active vibration control system of smart structure with piezoelectric materials was put forward, and the smart flexible cantilever structure was analyzed, the active vibration control system was realized in the lab. The result proved the methods’ feasibility and practicability.
Analysis of Piezoelectric Power Harvesting with Composite Energy Converter in Thermal Environments
Authors: Wen Sheng , Zhang Tie Min , Yang Xiu Li
Published: October 2010

A composite piezoelectric energy converter intended for Micro-electromechanical Systems (MEMS) from background vibrations is presented. The converter is composed of a piezoelectric circular plate bonded to a brass substrate with different diameters. The vibration of the structure is analyzed based on the thermal-piezoelectric-elastic theory and Kirchhoff’s assumption. The vibration solutions and the relation between the vibration and output charge are obtained. The effects of geometric characteristics and environment temperatures on the electrical energy generation are numerically discussed. The numerical results show that the vibration-induced voltage is proportional to the excitation frequency and the thickness of the device, but is inversely proportional to the temperature of the environment. The experimental data show good agreement with the energy conversion analytical model.
Dynamic Analysis of the Sucker-Rod Pumping System of Deviated Well Based on LuGre Friction Model
Authors: Liu Bai Xi , Liu Hong Zhao
Published: October 2010

Based on the LuGre friction model, the nonlinear dynamic characteristic of a sucker-rod pumping system of deviated well is simulated. Firstly, the LuGre friction model is introduced, and the values of its six model parameters, which satisfy the engineering’s needs, are obtained according to handbook and computation. Then, the vibration of the rod of sucker-rod pumping system is regarded as an axial vibration of multi-segment flexible rod. The loads analysis of rod element is accomplished by means of the finite element method, and recurrence formulas of load and elastic deformation are derived through the finite difference method. The boundary and initial conditions of the load and deformation are evaluated. In the end, a numerical example is given, where a comparison between the elastic deformation of pumping piston obtained based on LuGre friction model and that obtained based on classical Coulomb friction model is made to show that the LuGre friction model describe the friction of sucker-rod pumping system better.
The Influence of Boron on Structure and Mechanical Properties of Bainite Ductile Iron in the Step Austempering in Room Temperature Machine Oil
Authors: Wei De Qiang
Published: October 2010

In this paper, the low alloy bainite ductile cast iron has been obtained by a new heat treatment technique of the step austempering in room-temperature machine oil. The effects of element boron, manganese and copper on structure and mechanical properties of the bainite ductile cast Iron in above-mentioned process are investigated. The phenomenon, hardness lag of the alloyed bainite ductile cast Iron, has been discussed. It shows that after the step austempering in room-temperature machine oil, the hardness will increases with the time. It is found that boron and manganese can increase the hardness and reduce the impact strength while copper can increase the impact strength. The results show that reasonable alloyed elements can improve mechanical properties of the bainite ductile cast Iron. Essentially, hardness lag of the alloyed bainite ductile cast Iron is resulted from solute drag-like effect.
Effect of Contact Interface on Ultrasonic Characteristic of Wire Bond Transducer
Authors: Li Zhan Hui , Wu Yun Xin , Long Zhi Li
Published: October 2010

For improving the bonding strength of chip and vibration stability, propagation characteristics of ultrasonic wave across contact interface in wire bonding transducer was investigated in this paper. The rough contact interface is studied. The propagation characteristic is equivalent to the spring-mass model. The spring-mass model of ultrasonic propagation through contact interface was established. The reflection coefficient and transmission coefficient of ultrasonic is related to the stiffness of the contact interface. Aluminum wire bond experiments were performed on a laboratory test bench. The vibration velocities of the capillary and bond strength of chip were obtained at different tightening torque. The results show that the tightening torque in a moderate condition can the highest velocity of capillary and the largest bond strength be reached. Measuring of velocity of capillary can be a method of forecasting the bond strength of chip
Research on Fault Diagnosis of Ship Stern Bearing Based on Vibration Analysis
Authors: Jin Yong , Zheng Lin Liu
Published: October 2010

The application of vibration analysis in fault diagnosis of rotary machine becomes more and more popular. Aiming at an abnormal high frequency vibration of a stern bearing, this paper proposed a method of fault diagnosis based on the analysis of vibration characteristics and the spectral analysis. From the gathered vibration data of a stern shaft bench through Pulse Vibration Analysis Platform, using the speed spectrum array to determine the characteristics of vibration source, with the analysis of vibration characteristics of the bench, it concluded that the abnormal high frequency vibration source of the stern bearing is a weak rigidity part of bench─ tacho-torque meter. The vibration data of again test after strengthening the part illustrated the validity of this diagnostic mode.
Modal Test and Finite Element Analysis of Sand Blender’s Agitator
Authors: Hua Jian , Zhou Si Zhu , Wang Jun Qiao , Zhong Fu Ping , Wei Xiao Xia
Published: October 2010

Agitator as a key component of fracturing unit, its dynamic characteristic has great influence on performance of fracturing fluid and operation of sand blender, so it is necessary to get the dynamic characteristic of agitator. In this study, we conduct the experimental modal test of agitator by using uTeKL dynamic signal analysis system. The modal test system structure, the procedure and the technique of modeling and testing is presented in detail. Also the finite element modal analysis of agitator is carried out with SolidWorks software. Modal test and finite element analysis reveal similar results with the maximum natural frequency error is 5.15% and corresponding modal shapes are nearly same, which means the method and technique of modal test proposed in this paper is correct, the result is confident, and the finite element modal analysis of the agitator is feasible.
Modal Analysis of Ring-Plate of Double Crank Four Ring-Plate-Type Cycloid Reducer
Authors: Yang Bing , Liu Wen , Liu Yan
Published: October 2010

The vibration tests of the double crank ring-plate-type cycloid reducer driven by three gears are tested and analyzed with the HEAD acoustics multi-channel vibration test and analysis system. The tests of the reducer are completed under the condition of different rotational speeds and different loads. The vibration distribution rules of the reducer are obtained. The three dimensional model of the ring-plates of the double crank four ring-plate-type cycloid reducer with Pro/E are established, the modality analysis are carried out on the model by the use of ANSYS. The natural frequencies and the corresponding vibration models of the ring-plates are gained. The results are well consistent with that of the vibration tests which provide the basis for further study of vibration and noise reduction.
Research on the Vibration of Drilling Derrick
Authors: Yan Tie , Han Chun Jie
Published: October 2010

Derrick is the basic equipment during drilling, fatigue and failure are the problems that effect drilling efficiency, the strong vibration of derrick is the main reason that caused derrick failure. The various kinds of vibration of drilling derrick are analyzed in this paper. The model of derrick JJ60/38-W is set up, the phenomena of vibration of derrick are studied, and the vibration state behaves many dynamic situations under the bad condition, including axial, lateral, torsional vibration. These vibrations are studied; the rule of various kinds of vibration is obtained. The modal vibration and harmonic vibration are analyzed, the situation of harmonic vibration of different nodes of derrick are obtained. The software ANSYS is applied in this paper, the result can be used for the actual drill case.
Dynamic Analysis of Grinding Wheel Mechanism on Large Vertical Glass Edging Machine
Authors: Xu Hong Hai , Li Xiao Yang , Liu Dong
Published: October 2010

Insulating glass is an important architecture energy saving material, large vertical glass edging machine is one of the indispensable facilities on insulating glass product line, the vibration situation of grinding wheel mechanism on large vertical glass edging machine has an important effect on grinding quality. The paper has established the dynamic equation of grinding wheel mechanism and it was simulated by using MATLAB. The simulating result indicates that the distance (l) of grinding wheel mechanism to the top bearing has an important influence on the vibration of grinding wheel mechanism, the larger l value the higher amplitude, it should be considered when designing large vertical glass edging machine. In addition, the paper puts forward some effective solutions to reduce the vibration amplitude of grinding wheel mechanism such as improving the dynamic balance precision of grinding wheel, reducing the mass of grinding wheel mechanism and enhancing the rigidity of ball leadscrew.
Study on the Influence of the Damping to Nonlinear Vibration Caused by Pair Clearance
Authors: Yuan Ying Cai , Li Yan , Wang Yi Ming
Published: October 2010

Because the two components have relative motion, pair clearance is inevitable. With the machine’s speed increasing, nonlinear vibration phenomenon caused by clearance is much obviously. The state of damping in pair clearance will often make mechanism’s nonlinear vibration appear different status. For the study of damping in joint clearances impact to nonlinear vibration, four-bar mechanism with clearance is taken as research object. A nonlinear dynamic model has been established based on continuous contact model. Through analysis the nonlinear vibration in different damping and clearance, it can be found that in weak damping condition, nonlinear vibration in small pair clearance is more sensitive to the small changes of damping than that in large pair clearance. So, it’s very important to keep the pair clearance in proper lubrication conditions.
Subharmonic Resonance Analysis of a 2-DOF Controllable Linkage Mechanism System Affected by Self-Excited Inertial Force
Authors: Wang Ru Gui , Chen Yuan , Cai Gan Wei
Published: October 2010

The 2-DOF linkage mechanism system is investigated in this paper. Based on the air-gap field of non-uniform airspace of motor caused by the vibration eccentricity of rotor, the electro- mechanical coupling relation in the real running state of motor is analyzed. And the electro- mechanical coupling nonlinear dynamic model of the system is established by the finite element method. The dynamic equation is the bases on which the subharmonic resonance properties of the system caused by self-excited inertial force effected by the actual operating frequency of the rotor of the controllable motor are analyzed by the multiple scales method. The first-order stationary solution is obtained under that condition. The work presented in the paper is benefit for further studies on the inner connections between dynamic characteristics and motors electromagnetism parameters of such mechanism system, a numerical example is presented.
Numerical Simulation of a Self-Decoupling Magneto-Rheological Damper on Electromagnetic-Thermal Coupling
Authors: Yu Guo Jun , Du Cheng Bin , Wan Fa Xue
Published: October 2010

Based on electromagnetic-thermal coupling field mechanism, a large-scale finite element analysis model for electromagnetic-thermal coupling global damper is established by ANSYS software. Electromagnetic field and temperature field sequential coupling analysis method is used in this study. Relative permeability and resistivity of magnetic material with temperature is also considered in the FE model. The simulation results show that the temperature of self- decoupling magnetic damper rises rapidly under external excitation, the temperature changes the magnetic fluid yoke and the materials’ core parameters, magnetic flux density in damper channel gradually decreases with the time, and the damping force decreases, finally the high temperature decline phenomenon is revealed.
Research on Electroplastic Drawing Technology and Equipment
Authors: Li Da Long , Yu En Lin , Liu Zhou Tong
Published: October 2010

This paper studied the pulse generator and conductive device between metal wire and electrode for electroplastic wire drawing. We adopted the powerful GTR module on the design of the pulse generator, which makes a great superiority in the pulse waveform. The experimental results show that the design project is feasible and effective. In this paper, we displayed three types of conductive device between metal wire and electrode. According to the results of the experiments, the advantages and disadvantages of the three types of conductive device were discussed. Moreover, we also discussed the selection principles and methods for electrical parameter during the course of electroplastic drawing. Theoretical analysis and the experimental result indicate that it is advisable to use larger current density as much as possible, while try to decrease pulse width and frequency.
The Dynamics Analysis of Metamorphic Mechanisms Based on Fully Cartesian Coordinates Method
Authors: Chang Bo Yan , Jin Guo Guang , Dai Jian Sheng , Yun Jin Tian
Published: October 2010

Because of special structure and dynamic behavior, the dynamic equations of metamorphic mechanism are variable during the process of configuration change. In order to combine dynamics analysis and structure design of metamorphic mechanisms intimately, a new method of forming dynamic model of metamorphic mechanisms is proposed based on fully Cartesian coordinate’s method and the relation between origin mechanism and sub-configuration. A new concept named origin constraint equation is introduced which can be converted into constraint equations of each sub-configuration easily by adding corresponding constraint equations of configuration change. Constraint equations commonly used in configuration change and dynamic equations of each configuration are given in the form of natural coordinates. Finally, a four-bar spherical metamorphic mechanism is used as an example to validate this dynamic modeling method.
The Study on Harmonic Vibration of Drill String in Horizontal Well
Authors: Han Chun Jie , Yan Tie
Published: October 2010

During exploitation of horizontal well drilling engineering, the problem of drill string failure is very serious, there are many reasons, and drill string vibrations are main reasons. In this paper drill string of horizontal well is object being studied. The models about various vibrations are set up. The vibration rule of drill string is obtained under different situation; the axial and lateral frequency of drill string vibration in free state is studied. The analysis of modal vibration of drill string is the basis of the analysis of harmonic vibration of drill string. The harmonic vibrations rules of drill string of horizontal well are studied. All sorts of resonance frequencies are obtained practicability. This study can prove basic method for optimizing drill tool of horizontal well and reducing drill string failure.
A Two-Stage Optimization Approach for Structural Dynamic Design of Mechanical Systems
Authors: Qin Xian Rong , Shen Jun Jie , Zhang Jian Jie , Li Yong Feng , Zhang Qing
Published: October 2010

In this paper, a two-stage optimization approach for structural dynamic design was proposed on the basis of Component Mode Synthesis (CMS in short) technique. To improve the convergence of the optimization, the optimization was decomposed to two stages, i.e. the global and the local stages. The dynamic performance of the global assembled structures was optimized at the global stage by minimizing the total mass, taking the position of nodes as design variables. At the local stage, the performance of the local components was optimized by keeping the component mass less than the initial value, and getting the performance of the global structure improved. The CMS technique was integrated in the optimization to reduce the modeling cost and to determine the objective function of the local stage optimization. The dynamic optimization of the metal structure of an escalator was taken as an example to illustrate the feasibility and effectiveness of the proposed approach.
Dynamic Response of a New Railway Emergency Steel Truss Girder under the Moving Train Loads
Authors: Zhang Yao Hui , Wang Hai Long
Published: October 2010

In China, a new railway middle-span emergency steel truss girder, which can adapt to the technical requirements about quickly repairing the damaged railway bridges, is developed under the new situation. The old emergency steel truss girder for the railway bridges can not adapt to the current technical requirements. So, the new railway middle-span emergency steel truss girder (hereinafter referred to as the new girder) is developed after hard work. The great changes on the structure, the connections, the structural details and the multi-purpose have taken place on it compared to the existing old similar girder. In this paper, the structure and technical characteristics of the new girder are introduced. In order to improve the new girder’s design, the dynamic responses of the new girder are calculated using the train-bridge coupling vibration theory. In the paper, the 32m-span girder are the main object of study. The vibration-related laws are revealed versus the different train speeds, and the proposals about the largest traffic safety speed are given.
Research on the Impact of AGC Vibration on the Horizontal Vibration of the Roll System for CSP Rolling Mill
Authors: Yan Xiao Qiang , Bao Miao , Zhu Guang Hong , Song Ze Hong
Published: October 2010

CSP rolling mill abnormal vibration problem is one of the worldwide difficult problems in rolling fields. In this article, using the modern acceleration telemetry system, an integrated test is taken to the rolling mill vibration and the laws of the mill vibration are captured. The test shows that there is severe horizontal vibration of roll system, especially the work rolls, at the same time, there are also abnormal vibration occurs on AGC (automatic gauge control). In order to reveal the internal links between the vertical vibration of AGC and horizontal vibration of the roll system, using the harmonic analysis module and the transient response analysis module of ANSYS software, through simulation study to research the impact of the vertical vibration of AGC on the horizontal vibration of the roll system and meaningful conclusions are clarified.
Dynamic Characteristics of Planetary Gearbox of Shield Tunnelling Machine
Authors: Xiao Zheng Ming , Qin Da Tong
Published: October 2010

Shield tunneling machine(STM) is a safety and high-efficiency excavator in the subway tunnel project, but the dynamics of whose multi-stage planetary gearbox is still a critical issue. In this paper, the torsional dynamic model for three-stage planetary gears train(PGT) is developed by lumped parameter method. According to the configuration and design parameters of the planetary gearbox, the natural frequencies are calculated, and the vibration modes are also analyzed. The natural modes can be classified into one of the three categories: rigid-body mode, distinct modes and planet modes. By using finite element(FE) method, the vibration characteristics of gearbox housing are also computed and analyzed for lucubrating vibration transfer and coupling between planetary gears train and housing, which is the important foundation for dynamic optimization of planetary gearbox.
Optimum Design of Compound-Axis Servo System
Authors: Zhan Wei Da , Li Hong Zuo , Wang Zhi Jian
Published: October 2010

To overcome the limit on the natural resonant frequency and bandwidth of the traditional single-axis servo system, the paper designed a double-axis compound servo system, and established the transfer function of the fast reflector, camera, D/A data acquisition card and velocity servo unit, and further obtained the transfer function and theory model of this servo system. By combining simulation, it analyzed the influence of the dynamic hysteresis error, flat vibration error, centroid detection error, mechanical torque distortion error on the accuracy of the system. It proposes the view that the modern synthesize algorithm can optimize and compensate the parameter of the fast reflector system, by this method designed robust controller can restrain the remaining low frequency distortion and high frequency noise of the system, and further improve the bandwidth and accuracy of the system. The experiment shows that the compound-axis servo system bandwidth is of 2-16Hz and system accuracy of 0.8-4μrad.The experimental results and theory analysis are compatible basically. The design provides a foundation for the study on the servo system in the fields of the space optical communication system, deep space detection, remote sensing and etc
Dynamic Simulation and Experimental Modal Analysis of Large Vibratory Feeder
Authors: Zhang Lian Wan , Yin Zhong Jun , Chen Bing , Tang Zhi Chao , Tian Zheng
Published: October 2010

The LMS Test.Lab system was used to carried out experimental modal analysis of large vibratory feeder, the PloyMAX method was employed to estimate and identify the modal parameter of vibratory feeder and the modal parameters such as modal frequencies, modal damping ratios and mode shape at concerned band were got; Compared the results of experimental modal analysis to the results of finite element method, the results show that the experimental modal analysis and finite element analysis was consistent to some extent, verified the correctness of finite element model; the bias between experimental and theoretical is inevitable, the experimental results are more reliable relative to the actual and better reflect the dynamic characteristics of vibratory feeder, which will be provided as the reference for dynamic design and dynamic improvement of the vibratory feeder.
Dynamics Analysis for Periodically Forced Oscillation System
Authors: Lu Ning , Mao Jian
Published: October 2010

Among various non-smooth dynamic systems, the periodically forced oscillation system with impact is the most common in engineering applications. The dynamics becomes complicate due to the impact against the stops. This paper presented a systematic study on the periodically forced oscillation system with impact. In particular, impulsive differential equation, Poincare map is applied. The proposed model has high numerical accuracy in describing their dynamics. It helps to optimize the design of a commercial product.
Microstructure and Property of Rapid-Solidified Al-Si Alloys by Solution Treatment
Authors: Wang Ai Qin , Xie Jing Pei , Wang Wen Yan , Li Ji Wen , Li Luo Li
Published: October 2010

A rapid-solidified hypereutectic Al-21Si-0.8Mg-1.5Cu-0.5Mn alloys strips has been prepared by single roller melt-spinning. The effects of solution technology on the microstructures and properties of the strips have been investigated by SEM, TEM. The results showed that the nucleation and growth of primary silicon are suppressed and α-Al is nucleated which prior to eutectic. The Cu, Mg and Mn are all supersaturated solution in α-Al. The major part of Si solution in α-Al, and the rest are precipitated by the micro-nanocrystals eutectic silicon. The metastable microstructures of micro-nanocrystals hypoeutectic are formed. And in the solution process, Si are precipitated from the matrix and gradually aggregate up to form small particles distributing in the matrix with the heating time. At 480°C for 100 minutes followed by quenching in water and a natural aging for 96h, the finer and more roundness of silicon particle and the maximum Vickers hardness are formed.
Fracture Cause Analysis and Improvement on Waveguide Tube of Satellite Calibration Antenna in Random Vibration
Authors: Fan Wen Jie
Published: October 2010

Satellite calibration antenna suffered rigorous vibration environment in the course of lunching. Random vibration is being specified for acceptance tests by spacecraft structure. The waveguide tube of antenna was cracked in the random vibration test. Fracture analysis using scanning electron microscopic showed that failure were induced by fatigue damage. Finite element model of antenna was built and root mean square (rms) stress of waveguide tube was obtained in random vibration analysis. The maximum rms stress was 35.6MPa and located at the flange base. Then fatigue life of waveguide tube was estimated, using the Palgren-Miner rule and the three-band method. The estimated fatigue life of 109 seconds showed the waveguide tube couldn’t ensure safety during 120 seconds of the random vibration. Finally two ribs were added at each flange base for decreasing the stress concentration. The fatigue life of improved waveguide tube was 811 seconds. Then it passed the random vibration test.
Dynamic Reliability Evaluation of Pressure Pulsation for Hydraulic Power Pipelines
Authors: Liu Wei , Gao Hang Shan , Yue Zhu Feng
Published: October 2010

The pressure pulsations inner the hydraulic power pipelines not only deteriorate the precision of execution unit, but also bring on vibration, noise or other troubles in hydraulic device. In this paper, the output pressure pulsations were treaded as a stationary random process approximately. The mean square deviation of dynamic stress under the pumping source white noise exciting was calculated based on frequency responses. The first-passage failure criterion and fatigue damage accumulation failure criterion were adopted to analyze the dynamic pressure reliability respectively, and the relation of amplitude pulsations and the pipelines reliability was obtained. The results indicated that the preventative design method of below10% of rated pressure did not meet the security specification of the hydraulic power unit.