bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Image Identification of D.Huoshanense with Joint Transform Correlation Using the Electronic-Addressing Spatial Light Modulator
Authors: Bao Yong Sheng , Lu Rong De , Ren Y.X. , Zhang Quan , Ding X.Y.
Published: November 2012

The optical joint transform correlation based on liquid crystal spatial light modulator is a fast and parallel processing technique with high efficiency, which electronic correlation processing techniques can not match with. Similar to the correlation techniques in electronics, the sampling in optical joint transform correlation is of great importance for correlation algorithm. This paper discusses the space bandwidth problem in joint transform correlation identification experiment realized by electronic-addressing liquid crystal spatial light modulator (ELC-SLM) and CCD, and analyses the relation between focal length of Fourier lens and the resolution of lockport community television (LCTV) and charge-coupled device (CCD). Using double slit, the leaves of Dendrobium huoshanense(D.huoshanense) and so on as primary signal of correlation algorithm, it discusses the lineament and size of suitable joint transform correlation (JTC) using an object image and a reference image. In the experiment nonlinear exposure of power spectrum enhances the diffraction efficiency of correlation image. Using the joint transform correlation image recognition platform in experiment, there are leading in recognition to make quantization of recognition results. This research has certain significance to the joint correlation problem about the leaf image processing of D.huoshanense.
Model-Based GA Evolutionary 3-D Position Measurement Method
Authors: Liu Xu , Song Wei , Zhang Ya Nan , Li Xiao Lei
Published: November 2012

This paper presents a vision-related technique for 3-D position measurement. The proposed method utilizes the genetic algorithm (GA) and unprocessed grayscale image input from vision, in order to perform recognition of a target being imaged with known target object shape. The problem to recognize the target shape and simultaneous detection of the position, is converted to an optimistic problem of a model-based evaluation function, named as surface-strips model-based fitness function that consists in the computation of the brightness difference between an internal surface and a contour-strips. In order to evaluate the proposed 3-D recognition method, experiments by an unprocessed grayscale image have been input to recognize a ball in the image. The results show the effectiveness of this method for 3-D position detection.
FPGA-Based Image Processing System for Target Locating
Authors: Wang Lu , Fu Xiao Ning
Published: November 2012

In this paper, we proposed the design of an FPGA-based image processing system for target locating. The locating mechanism is based on the feature line segments of target’s image. The system processes the target’s image sequence, finds and matches feature points on each image, and uses the feature points to calculate the length of feature line segments for target locating. We implemented the Speeded Up Robust Features (SURF) algorithm on FPGA hardware to extract feature points. The system has a core CPU for control and part of the mathematical computation. Custom-designed logic circuit modules are used to accelerate the feature point extraction. The system’s software is designed to work with parallel and pipeline operation. The performance test shows that the system is capable of real-time processing.
The Design and Dynamic Analysis of High Frequency Ultrasonic Transducer for Wire Bonding Application
Authors: Zhang Zhen , Yan Tian Hong , Chen Xue Dong , He Bo , Xu Xin Sheng
Published: November 2012

The ultrasonic transducer converts electrical energy into mechanical vibration, and its vibration characteristics have a great effect on the bonding quality. Bond grid arrays (BGA) application and the ability to decrease the temperature of the wire bonding process urgently demand higher bonding frequencies. The ultrasonic transducer working at 135 KHz has been designed, simulated and tested. Based on electromechanical equivalent circuit theory, the dimensions of the transducer were designed. Through finite element method (FEM), the dynamic characteristics of the transducer were investigated. The 5th order axial mode of the transducer resonating at 133 KHz is the working mode. The undesirable modes near the working mode have a great influence on the quality of bonding and must be considered carefully in system design. At last, the experimental testing was conducted for verifying the design and simulation results of the transducer.
The Measurement of Compressible Elasticity Modulus and Poisson Ratio of Ziziphus Montana Wood
Authors: Duan Jia Xi , Zhou Qi Dou , Ji Gang , Wang Lu Cai
Published: November 2012

Abstract: Timber is a typical orthotropic material, of which the accurate measurement of elasticity modulus and Poisson ratio is important. In this article, the test samples are manufactured according to GB 1943-1991 and 1935-1991. An electronic testing machine is employed to add longitudinal load on samples and the longitudinal and transverse strains are measured via Wheatstone bridge. Then, the compressible elasticity modulus and Poisson ratio of Ziziphus montana wood in three directions is obtained. The results show that the elasticity modulus measured is of similar magnitude to those with similar dry density and of great importance to finite element calculation.
Analysis and Research of Deep Foundation Pit Pars Horizontal Displacement Prediction Method
Authors: Sun Jian Bo , Wang Dong
Published: November 2012

Deformation of foundation pit is a complex, can not be quantified, factors affecting multiple process. Using curve fitting model and time series AR ( n ) model for the combined model on deformation of foundation pit displacement prediction. By the depth of the pit excavation and supporting different direction condition, segmentation modeling prediction. With the development of foundation pit deformation, constantly adding new data, and delete the old data, to modeling, implementation of the whole process control of deformation and displacement prediction. Combined model to the prediction of first data, the relative error can be controlled within five percent. Therefore,the model can be used to control the deformation of foundation pit projects that require high, can also be used for other models predict data close to the alarm value of a contrast.
Analysis and Mechanism of Impact of GPR Detection Effect Result from Soil Water Content
Authors: Wang Xin Jing , Hu Zhen Qi , Zhao Yan Ling , Guo Yu Ming , Wang Pei Jun
Published: November 2012

Using the ground-penetrating radar (GPR) system with the different frequencies and neutron probe, combing with radar image interpretation and the amplitude spectrum, the impact of GPR detection effects on the soil taxonomy and underground pipe were analyzed. The results indicate that when the soil content is 17.02%, the effect on soil taxonomy of 750MHZ antenna is better than 400MHZ, but the effect on underground pipe is same. As soil water content increases to 25.333%, the soil taxonomy of two antennas’ detection tends to same, and “fake stratifications” existed. The soil water content accelerates to 36.389%, the detection effect on soil taxonomy and underground pipe is so poor. Attenuation mechanism and propagation characteristics of the high electromagnetic wave were presented to interpret those phenomena. The above analysis shows that the soil water content is one of the main prerequisites for the applications of GPR. Some indicators could be provided to nondestructive test in land consolidation project quality by GPR from this research.
Research on Extracting Residential Information from ETM+Images - A Case Study of Jiaxing City
Authors: Xiong Jun Nan , Liu Shan , Yang Yan Mei , Wang Ze Gen
Published: November 2012

Extracting residential area from remote sensing image is an important issue in remote sensing mapping, disaster assessment, city planning and other field. In this paper, the existing residential area extraction method are analyzed at first, including the method of threshold structure in the spectral, combination knowledge discovery and spectral structure, NDBI, NBI and IBI ; Then, the differences of Spectral characteristic and how to distinguish residential area and other land use type are discussed, the extraction model is build based on the above research. Taking Jiaxing City, Zhejiang Province as an research area, residential area are extracted from ETM+ image use NDBI index and Spectral structure difference. At last, precision analysis indicate location accuracy is 85% ,area accuracy is 88.8%, the result show this method can improve the divisibility of residential area, bare land and road. The extraction result can provide data for remote sensing mapping, disaster assessment, city planning, etc.
The Design of New Low Cost Ocean Bottom Seismometers
Authors: Guo Hu Sheng , Yan Bin , Wu Zhi Dong
Published: November 2012

The performance of the Ocean Bottom Seismometers (OBS) in seismic wave field measurement is vital to seismic exploration. In order to improve the performance of OBS, we have been developed a new Ocean Bottom Seismometer based 3-component MEMS accelerometer sensors. In order to sample seismic data synchronously, we have been designed multichannel A/D unit under the control of MSP430.We also are involved in a handle and sophisticated equipment allows to storage sampling data in the SD card module. The system based MEMS sensor are compared with conventional analog moving coil geophones, the result shows that the new measurement system with the advantage of high dynamic range, low noise and anti-jamming that suit for the high resolution seismicity information. The paper show that the new digital OBS using MEMS accelerometer will replace the tradition OBS in oil exploration, scientific research and seabed surveys.
The Application of GPS for High Rise Building Deformation Monitoring During the Servicing Stage
Authors: Zhang Hou Tian , Hu Lei
Published: November 2012

With the development of the city, there has more and more high rise buildings, people has serious attention on the security problems of the high rise buildings. Code for deformation measurement of building and structure asks that, deformation monitoring for high-rise building during service stage is necessary. During servicing stage of the high-rise building, owing to the change of site conditions, it is difficult to use former monitoring way. GPS plays a incomparable role in the deformation monitoring during the servicing stage for its advantages of high precision, fast speed and easy operation. This paper introduces the monitoring way and data processing of using GPS for high-rise building during servicing stage, using a example to prove that the application of GPS in deformation monitoring for high-rise building during servicing stage is feasible.
Design and Implementation of Optimal Noise Shaping Filters
Authors: Zhou Jing Lei , Zhu Zeng You
Published: November 2012

When re-quantize a signal of low levels, serious distortion may occur due to word length reduction. Adding proper dither before re-quantization can improve the quantization error characteristic, while it will increase overall noise. By applying noise shaping, transposing most of the noise power to the band which human ear is less sensitive can reduce audible noise and thus improve auditory sense. This paper firstly discussed the applications of dither and noise shaping in professional digital audio, according to human ear’s psychoacoustic properties, by adopting genetic algorithm, fulfilled the design of psycho-acoustically optimal noise shaping filter. Then it applied the noise shaping technology to upsampling processing, realized the optimal noise shaping filter design under oversampling condition. Finally, it performed algorithm simulation on mat lab platform. Actual listening test confirms that by combining noise shaping technology with upsampling technology, sound quality can be improved significantly.
Cushion Surface Modeling Based on Body Pressure Distribution and Subjective Rating
Authors: Yang Zhong Liang , Chen Yu Miao , Liu Zheng
Published: November 2012

This paper presents a method of ergonomic design based on subjective rating for the purpose of modeling cushion surface mapped by body pressure distribution (BPD) test data. A sitting comfort evaluation scale was designed to collect subjective comfort perception. Optimal BPD test data were selected by comparing comfort rating after experiments on a trial seat. A data mapping model was established between point clouds in three dimensional coordinate and BPD test data, which can be recognized and transferred in CAD system. In this context, an ergonomic-aided system was developed in practical application to demonstrate the viability of the method. Two designers tried out the system to design a seat cushion, and compared it with conventional method in Rhino software. Results show that the system is more interactive to designers, which can save time of surface modeling by about 50%.
A Comparison of Characteristics of Improved Total Contact Insoles
Authors: Wang Qi , Wang Qing Ming
Published: November 2012

The purpose of this study is to investigate the effects of two kinds of total contact insoles (TCI). Traditional TCI reflects the shape of foot, while deformed total contact insole(DTCI) was established basing on the shape of footprints on clay prototypes. A female experimenter was asked to exert different loadings on clay prototypes to make footprints. Shapes of the footprints have been recorded by a reverse engineering method. Force distribution results in given preconditions were reflected and recorded for quantified comparison. shapes of two total contact insoles were rebuilt under different loadings. Having deformation of different magnitude over each area as a reference, effect and possibility of further improvement have been explored. Our findings showed that insoles based on larger deformation can be utilized to redistribute peak pressure effectively under normal loading. The results indicates that DTCI in this study can be used as a more important tool in adjusting functions or comfort ratings of shoes.
An Entropy Function Implementation of Quadratic Programming
Authors: Wang Xiao Guang , Hou Chun Juan
Published: November 2012

This paper is intended to describe a new algorithm, which makes entropy function method with Lagrange function and Taylor formula for solving inseparable variables of quadratic programming. Quadratic programming problem are an important in the fields of nonlinear programming problem. Entropy function also called KS function. The nature and related certificate of KS function and its convergence have already been proved at home and abroad. The application of KS function nature for solving quadratic programming is a very good method, and it is one of the advantages of making more constraint programming problem become a single constraint programming problem, and the original problems are simplified. Electing three examples of separated variables for quadratic programming problems, that is cross terms of zero, and then contrasted with the new method. The algorithm resolves implementation of separated variables of quadratic programming. Our numerical experiments show the proposed algorithm is feasible.
Study on Instrumental Intensity Using Wenchuan Earthquake Records
Authors: Zhang Ming , Zhang Yu , Zhou Guang Chun
Published: November 2012

This paper invesigates the peak ground acceleration (PGA) and peak ground velocity (PGV) regression equations as well as the PGA or PGV middle values in Chinese seismic intensity scale 2008 (the CSIS 2008), using the Wenchuan earthquake records of China with the full seismic information. Based on the analytical results, the PGA-V method is proposed to assess the instrumental intensity which combines both PGA and PGV. Besides, a problem is raised to further verify and modify the middle values of PGA or PGV for the seismic intensity VI and VII in the CSIS 2008.
Heat Transfer and Thermal Load Analysis of Exhaust Manifold
Authors: Xu Shi Long , Shi Yan , Li Shou Cheng
Published: November 2012

With the appearance of high temperature resistance alloy steel and the requirement of light weight for vehicles, more and more exhaust manifolds are made from newly developed alloy steel. The changing of material directly affects the design and manufacturing process. To estimate the thermal load of the tight-coupled exhaust manifold, the joint analysis methods of CFD and FEM are put forward to predict the temperature distribution, thermal stress and deformation. Using Computational Fluid Dynamics (CFD) method, gas temperature and convective heat transfer coefficient, adjoining the inside and outside surfaces of the exhaust manifold, are estimated firstly in this paper. Then these results are mapped to the finite element mesh of exhaust manifold, which are created for the heat transfer analysis. At last, thermal stress and thermal deformation analysis are presented by taking nonlinear material properties into account, which provide some reference to evaluate the cooling capacity and structure design of exhaust manifold.
On Evaluation Methodology for the Performance of Engineering Project Management Based on 5-Element Set Pair Analysis
Authors: Zhao Yang , Wang Yue
Published: November 2012

Being the main management model of government, engineering project management plays an important role in improving the benefit of investment and ensuring the quality of project, construction process and its safety. The evaluation system for performance of engineering project management (PM) is still new in the domain of engineering PM, in which it evaluates the management process and its service quality, and the management objectives are the contents of the evaluation system. Through analysis of the entire PM Service from these enterprises, the paper proposes an index evaluation system for the performance of engineering PM. Based on the 5-element set pair analysis whose philosophy is “admit objectively, describe systematically, cultivate qualitatively and analyze specifically”, it establishes an evaluation pattern for the entire process judgment and finally, combined with the actual cases, and it demonstrates the feasibility and applicability of the system.
Research on the Land Decision of Real Estate Enterprises Based on Fuzzy AHP
Authors: Zuo Rui
Published: November 2012

Land decision is a prerequisite for the healthy development of real estate enterprises, the decision-making is a multi-criteria decision-making problem. This paper mainly research on the real estate enterprises’ land decision, considering the land decision factors integrating real estate enterprises’ characteristic, using the analytic hierarchy process (AHP) and fuzzy theory to effectively integrate qualitative and quantitative factors of the real estate enterprises’ land decision. First of all, this paper expounds the real estate enterprises’ land decision-making process based on the fuzzy analytic hierarchy process (AHP). Secondly, it takes an example of a real estate enterprise to analysis it. Finally, the research showed that the fuzzy analytic hierarchy process (AHP) was effectiveness and feasibility.
Study of Erosion Mechanism by Modelling Abandoned Yellow River Delta
Authors: Liu Jie , Gao Tao
Published: November 2012

Three dimensional physical model designed to study erosion mechanism of estuary subaqueous delta is one of the most important approaches for investigating erosion mechanism of delta; In this study, effects of pore water pressure on seabed and subsequent alterations of seabed topography during wave action were examined by using a physical model. This model provides a good tool to understand impacts of silt liquefaction on the seabed, the whole process of erosion of estuary subaqueous delta, formation and changes of sandbars, and the forces and changes of soft strata through interaction with wave action. We have demonstrated that the characteristic features of a soft stratum and the erosive forces existing in its aquatic environment tend to induce rheological diversification and creep. This often leads to ultimate diapir causing significant damages to underwater and offshore engineering facilities. Moreover, submarine sand wave is a common geomorphological feature of seabed. Impacts of waves and seabed topography on the formation and characteristics of sand waves are analyzed particularly in this study.
Numerical Simulation of Velocity Attenuation of Aerated Jet Flows
Authors: Wei Wang Ru , Deng Jun
Published: November 2012

Mixture RNG k-ε double-equation turbulence model is applied to study the velocity characteristics of aerated jet flow. The velocities of aerated jet flow under different air concentration are calculated. The results show that improving air concentration of jet flow can accelerate velocity attenuation of jet flow along the axial way. The reason that aeration influenced velocity attenuation of jet flow in this article is that improving air concentration of jet flow can reduce the core length and then accelerate attenuation of axial velocity. The distribution of velocity at specially appointed section is nearly Gaussian distribution and was not influenced by air entrainment prominently. The calculated results of velocity attenuation are in good agreement with those obtained by semi-empirical relationship. It indicates that the numerical simulation can effectively be used to study aerated jet flows.
Taking Fangcun District of Guangzhou as an Example to Discuss the New Joint Repair Technology of Water Distribution Network
Authors: Gao Dan , Wang Zhi Hong , Ren Gang , Long Zhi Hong , Chen Yu Li
Published: November 2012

This paper has discussed the working principle and characteristics of the new commonly used pipeline repair technology by introducing the currently commonly used pipeline repair technology. The new commonly used pipeline repair technology can be classified as two big kinds including one based on excavation and trenchless technology. When selecting the pipeline repair technology, we mainly considerate four factors: whether excavat pipeline , whether cut off the water and the time of cutting off water , the time of pipeline repair , the materials of pipeline repair, and so on . The actual situation and network features of water supply network in Fangcun district of Guangzhou are analysed , the joint repair technology strategies of water supply network which applies to Fangcun district are discussed by synthesizing the applicability, merit and demerit of new pipeline repair technology, and use these as technical reference and guidance for other similar areas .
Study on the Highway Speed Limit at the Days of Snow and Ice
Authors: Liu Jun De , Peng Tian Tian , Zhuang Jing , Deng Ya Juan
Published: November 2012

In order to prevent traffic accidents caused by bad speed snow day weather and achieve the purpose of protection of highway traffic safety. Through the analysis of ice conditions, we identified of the rate-limiting model in the snow, snow, snow icing conditions and curve sections, we applied to the model and the calculation of mathematical solution and come to the conclusion of the speed limit which is recommended values at the days of snow and ice disaster conditions. In the practical application, it is convenient to get the speed limit under the necessary conditions through look-up the table of this article in order to ensure the safety of traffic on the road.
Application of Unmanned Aerial Vehicle Remote Sensing for Geological Disaster Reconnaissance along Transportation Lines: A Case Study
Authors: Hu Ji Ping , Wu Wen Bin , Tan Qu Lin
Published: November 2012

Compared with conventional airborne remote sensing application to engineering geological investigation, High precision Unmanned Aerial Vehicle Remote Sensing (UAV-RS) technology can improve work condition with advantages of high flexibility, low cost, high efficiency and up-to-date situation acquisition. Especially, it has very important engineering significance for quick and urgent geological disaster reconnaissance along transportation lines. In the paper, some aspects of application to transportation-line (pipeline, highway and railway) engineering geological investigation were discussed. The concerned key points, including components of UAV-RS system, data processing workflow and image interpretation were analyzed. As a case study, a UAV-RS application project for transportation-line geological disaster investigation was given. The utilization of this new remote sensing technology successfully collected and discovered potential geological disasters and provided scientific data for timely decision-making.
Research on Energy Saving Supervision System of Colleges and Universities Heating Based on Control Theory of Time & Temperature Sharing
Authors: Yang Hong Qing , Xi Fei , Zhang Hua Gang , Li Hui
Published: November 2012

According to the spirit of relative documents issued by Ministry of Housing and Urban Rural Development and by Ministry of Education, and combined with the intermittent use features of public constructions in colleges and universities, Energy saving supervision system of colleges and universities is established by using automation control technology and content networking technology. By means of installing wireless temperature sensors, time & temperature sharing controllers and electric control valves, scientific management mode of remote temperature monitoring, time & temperature sharing controlling, and on-demand heating is achieved.
Brief Analysis of Landscape Architecture Sculpture Sketch
Authors: Xiong Shu Hui
Published: November 2012

Discussed manifestation of the sculptures in the landscape design, landscape architecture, space sculptures and how to give people enjoy the art of beauty. Landscape sculptures with strong appeal of the plastic arts, the future urban construction, landscape sculptures designed to take a unified planning, that is to grasp the artistic taste of the sculpture itself, and strive to a new and unique themes.
Developing a Framework for Evaluating Architectural Style Based on GEP
Authors: Su Ke , Li Xue Lin
Published: November 2012

Style has long been an important index to observe the design thinking of designers in architecture. The emergence of architectural style includes together from known state of the building to the whole design process. Gene Expression Programming (GEP) is an evolutionary algorithm that automatically creates computer programs. This paper mainly discuss a framework for evaluating architectural style based on GEP and the architectural style based on GEP is studied. Through the analysis of the basic characteristics of architecture style, the framework for evaluating architectural style is extracted. The rules of architectural styles are discussed. The algorithm of Gene Expression Programming model is proposed. Finally, an evaluating architectural style framework based on GEP is developed. The framework helps the follow-up researcher to break through the restriction of style grammar and enable having the ability to analyse the formations of style of contemporary architects.
The Elaboration of Five "Perspectives": Application to Traditional Landscape Idea in Modern Landscape Design
Authors: Feng Shang , Xu Kai Yuan
Published: November 2012

Modern landscape design is in a multi-culture era when many disciplines and many aspects are interwoven. Modern landscape is some kind of similar to traditional landscape design, but is also different to it in some aspect. Chinese traditional garden design is really profound, and its garden making ideology is more based on building the beauty of artistic conception to win praise. This paper takes global urbanization background as the starting point, and from the five perspectives of city, behavior, ecology, art and building, the paper try to explain the essence and culture connotation of traditional landscaping idea with real examples. This paper aims to conclude and summarize new craft and new technology, to inherit and promote traditional landscape characteristics, so that the traditional landscape could meet the need of urban landscape designing and developing.
Data-Driven Tracking Based on Kalman Filter
Authors: Jin Xue Bo , Du Jing Jing , Bao Jia
Published: November 2012

A good model of the target will extract useful information about the target’s state from observations effectively. There are many models used to maneuvering target tracking, such as constant-velocity (CV) models, Singer acceleration model (zero-mean first-order Markov model) and “current” model (Mean-Adaptive Acceleration Model), etc. While due to the complexity of maneuvering target, to seek the target model which can get better performance is still a subject worthy of study. For the AR process, autocorrelation function is estimated by the random sampling points in this paper. We have the statistics relation between the autocorrelation function and variance based on a first-order stationary Markov process. Then the system parameters are obtained and a model is developed based on statistics relation, which needn’t set unknown parameter. Simulation shows the model developed can adaptively get the model parameter and obtain good performance.
Application of Support Vector Machine in the Vibration Signal Measuring-Channel Modeling
Authors: Li Chuan Jiang , Zhang Zi Qiang , Feng Ying Peng , Tom Qi
Published: November 2012

Measurement accuracy of rotor unbalance in different speeds is affected by the nonlinearity of the vibration signal processing channel. Support Vector regression (SVR) is proposed to use for channel modeling and compensation, which performance is far superior to the traditional look-up table method. First the amplitude-frequency and phase-frequency characteristics models based on SVM regression are made using frequency response data of standard signal passing to measuring-channel as training samples, then the measurement signal is compensated according to the model obtained. Simulation and experimental results show that this method has higher accuracy, better generalization ability than the traditional BP neural network modeling method.
Modal Analysis and Optimization of Spindle Box of Turn-Milling Center Based on Finite Element Method
Authors: Zhu Li Da , Wang Xiao Bang , Yu Tiao Biao , Wang Wan Shan
Published: November 2012

The dynamic characteristics of machine tool may directly affect its machining capability, which is analyzed to improve the machining precision and efficiency. In this paper, the 3D finite element model of main components turn-milling center is established by using ANSYS software, and then spindle box of turn-milling center is analyzed and optimized; the natural frequencies and vibration models are obtained after analysis, which guarantee the design requirement of the machining center. Therefore it is significant to improve the design quality of machining center by using FEA software in the design process.
Experimental Study on Vibrational Transmission Characteristics of a Ring-Stiffened Cylindrical Shell Model
Authors: Wen Hua Bing , Zuo Yan Yan , Peng Zi Long , Shen Hua
Published: November 2012

A ring-stiffened cylindrical shell of experimental model with four equipment support pedestals was designed. The effect of vibr-ation transmission characteristics of the ring-stiffened cylindri-cal shell by the internal base structural style and layout positi-on was researched. The original mechanical admittances of su-pport pedestals were analyzed. Taking mechanical vibration ve-locity mobility as evaluation index, the vibration transmission characteristics from pedestals to the surface of ring-stiffened cylindrical shell have been experimentally studied, the mecha-nical admittance distribution pattern of the cylindrical shell sur-face has been indicated. The difference of mechanical admitt-ances at different positions is large at low frequencies, which is influenced by the mode shape of vibration of the shell struc-ture. However, the difference of mechanical admittances of dif-ferent positions is little at high frequencies, and the vibration transmission characteristics from pedestals to cylindrical shell can be indicated by the concept of spatial equivalent mecha-nical mobility.
Finite Element Modeling and Modal Analysis of Coilable Mast
Authors: Wang Jie , Li Dong Xu , Jiang Jian Ping
Published: November 2012

This paper investigates the modal characteristics of a coilable mast for space mission applications. Finite element models are established for characterizing the coilable mast. The simplification of joints between longerons and batten frames and the pre-tension in cables are carefully considered. A parametric modal analysis is performed with considering the following factors, the joint model in the truss, the pre-tension in cables, elements selected for longerons and battens, the mass attached to the top of the mast. Research results show that the natural frequencies of the coilable mast are sensitive to the selected elements and the attached mass. The pre-tension level in cables and the precision degree of the joint model have little effect on natural frequencies. The regularity expressed in the parametric modal analysis is useful for designers and engineers.
Study on the Mechanism of Vibration Reduction by Variable Speed Cutting
Authors: Wang Dao Lin
Published: November 2012

Chatter occurring in cutting process is an unstable vibration phenomenon, which affects the machining accuracy and the production efficiency, studied by many researchers for dozens of years. By analyzing the relationship with energy feedback and energy consumption on the machine structure system, this paper revealed that the mechanism of vibration reduction by variable speed cutting, qualitatively analyzed the obvious effect in suppressing cutting chatter by the continuous change of spindle speed. According to the principle of vibration, it established mathematical model of vibration reduction by variable speed cutting. Calculate the spindle phase difference angle within a week and each vibration after a week, thus get variable amplitude values after the start of each cycle. And further example analyzed the advantage of variable speed in suppressing cutting chatter.
Vibration Modeling and Sensitivity Analysis of Printed Circuit Board
Authors: Xu Fei , Li Chuan Ri , Jiang Tong Min , Liu Long Tao
Published: November 2012

Various failures in electronic systems, particularly in the connections between the printed circuit board (PCB) and components, are due to mechanical shock and vibration. The vibration characteristic of a plug-in PCB in an airborne electronic case (AEC) was studied first by finite element modeling (FEM) and experimental techniques. The coupling method and torsional spring elements were used in FEM to better simulate the PCB’s realistic boundary condition. A reasonable correlation between simulation and test results was obtained. Since the fundamental frequency is one of the most important dynamic characteristics of PCB, the orthogonal design and variance analysis, as well as FEM method, were discussed subsequently to investigate the effects of different factors. Analysis results demonstrate a good correlation with current studies. Finally, a general design guideline was presented to maximize the PCB’s fundamental frequency.
Influence of Rib Strengthening on Structure Vibration and Sound Radiation of Cylindrical Shell
Authors: Zheng Han , Zhou Qi Dou , Ji Gang
Published: November 2012

An approach combining FEM with BEM is adopted to calculate the structural vibration and sound radiation of an underwater cylindrical shell. By using FORTRAN codes to compute the added mass and added damping matrices, DMAP codes to add them to structural mass and damping matrices, the problem of fluid-structural interaction was solved. Through comparing the mean square normal velocity level and sound radiation power level of ring-stiffened cylindrical shell with different inertia moment of stiffeners, the results can be acquired: with the moment of inertia gets bigger, the peak frequency of the frequency-response curves increases while the peak value of vibration and sound radiation decreases. The number of strengthened stiffeners has the same effect on peak frequency as the moment of inertia, but has no effect on peak value.
Simulation and Analysis for Environment Vibration Induced by Urban Rail Transit with Ground Line
Authors: Zhang He Nian , Sun Qi Yun , Sun Guang Jun
Published: November 2012

The environment vibration induced by urban rail transit becomes one of the severe environmental hazards and attracted great attention for researcher at home and abroad. Firstly，on the basis of track irregularity theory, an exciting force function of vibration source induced by ground line train is established. Then, the exciting force acts on the three-dimensional models of rail bearing structure and soil propagation path by utilizing the finite element software. The surrounding environment vibration response caused by train operation is simulated and the numerical results are compared and verified by the field measurement data. Furthermore, the parameter effects of train speed and properties of site soil on environment vibration are studied. The researches show that the numerical simulation in the paper can truly reflect the actual environment vibration caused by urban rail transit with ground line.
Thickness Optimization Study of Constrained Damping Plate
Authors: Wan Hao Chuan , Zheng Ling , Li Yi Nong
Published: November 2012

Based on Kirchhoff hypothesis, the vibration equations of constrained damping plate are established and the equations are solved. Influence of the thicknesses of constrained layer and viscoelastic layer on structural vibration character are analyzed, the curves of natural frequency and loss factor with different thicknesses of viscoelastic layer and constrained layer are obtained. The figures indicated that it is not the more thickness of the viscoelastic layer and constrained layer the higher of the loss factor. Both of the thicknesses have optimum values, which are interact. The relationship between of loss factor and added mass is investigated. The results show that various thickness plans can obtain the same loss factor but very different added mass. So it is very necessary to optimize the thickness of viscoelastic layer and constrained layer to obtain the best damping effect.
Discussion on Commonly Methods for Analysis of Drill String Acoustic Spectral Characteristics
Authors: Liu Yong Wang , Guan Zhi Chuan , Zhao Guan Shan , Long Zhi Qiang
Published: November 2012

Finite difference method and transfer matrix method were used to get spectrum response curve of unit impulse function signal to research the spectrum characteristics of acoustic traveling though the drill string. Similarities and differences of the two methods were discussed through analysis of spectrum curve get from the two approaches. The results show that: The distribution of band-pass and band-stop get by the two calculating methods is basically the same, some transmission coefficient of finite difference method is less than 1, is not completely transmission phenomenon. Analysis of the reason for this is that the transfer matrix method is an analytic method, finite difference method is a numerical algorithm. From the calculation precision of speaking, analytic algorithm is higher than that of numerical algorithm. But to verify the reliability of two methods needs based on laboratory experiment or field test.
Analysis of Bearing Loads for Scroll Compressor Considering Phase-Angled Counterweights
Authors: Yu Yang , Li Chao , Zhao Man , Zheng Shang Shu
Published: November 2012

In order to improve the dynamic characteristics of scroll compressor, according to the crankshaft bearing characteristics of scroll compressor, based on the forces and moment equilibrium equations of the crankshaft and compressor frame body, used the frame body forces and crankshaft bearing loads as a variable, analyzed the frame body forces in the best of conditions by changing the counterweights installation angle to control the crankshaft bearing design formulas, thus obtained counterweights quality and phase angle and other parameters, ensured the service life of the bearing, and obtained effective control of the crankshaft bearing load and frame body force, improve the operation reliability of scroll compressor, prolonging the service life. This paper puts forward a set of formulas, which are derived based on analysis of the loads at crankshaft of scroll compressor. The formulas can be used to determine the parameters of installation angle of the counterweight and the forces of loads at crankshaft for scroll compressor.
Aeroelastic-Acoustics Numerical Simulation Research
Authors: Pei Xi , Xu Min , Guo Dong
Published: November 2012

The generation of aerodynamic noise of aircraft in flight is due to dynamical system and aerodynamic .The response of aircraft subjected to High acoustic loads and aerodynamic loads can produce fatigue and damage. In this paper a new Aeroelastic- Acoustics which adds acoustic loads in aeroelastic is presented. The emphasis of the study is the discipline of displacement and load of the flexible structure under the unsteady aerodynamic, inertial, elastic and aero-acoustic. The CFD/CSD/CAA coupling is used to simulate rockets cabin. Sound generated by a rocker is predicted numerically from a Large Eddy simulation (LES) of unsteady flow field. The Lighthill acoustic analogy is used to model the propagation of sound. The structural response of rocket cabin was given. The boundary-layer transition on the pressure side of the cabin is visualized, by plotting to better illustrate the essential interaction between fluctuating pressure and structure.CFD/CSD/CAA coupling compute method is validated in low and middle frequency.
Dynamical Sensitivity Analysis on Blades in Turbine Machines
Authors: Zhang Da Yi , Ma Yan Hong , Hong Jie
Published: November 2012

High cycle fatigue of blades caused by forced vibration is an outstanding problem in turbine machines such as turbo engines and ground gas turbines. Dynamical sensitivity analysis (DSA) is put forward and the mathematic model is erected according to blades. DSA on blades includes sensitivity analysis on inherent characteristic (DSAI) and sensitivity analysis on excitation environment (DSAE). The influence laws of dynamical parameters are gained through DSA, and therefore the optimization design on blades is feasible. DSAE is presented by dint of numerical methods, aerodynamic forces in engines possess multifrequency and spatial distributing characteristics, so DSAE on blades is performed against these characteristics and some results are obtained. Finally the resonance criteria are advanced and a new dynamical design method is put forward.
The Performance Analysis of Vertical Automatic Tool Changer System
Authors: Dong Hai Yang , Zhang Yan Heng , Li Yan Sheng , Sun Han Xu , Zou Yun
Published: November 2012

In this paper, we take the vertical tool changer device as an example to study the reliability of the manipulator in the heavy tool case. Firstly, introduce the structure of the vertical tool changer device, and do a simple instruction for the functions of the main components; Secondly, analyze the mechanical properties of the manipulator theoretically, find out the maximum force in the tool changer processing and build a virtual platform of the automatic tool changer to simulate the processing and test the performance of the tool changer; Finally, analyze the performance of the manipulator by finite element method in the heavy tool case. The analysis result shows that the maximum stress is less than the allowable stress: when the manipulator grasps heavy tool, so it is safe in the tool changer processing.
Investigation of Human Masticatory Movements Using ADAMS and MATLAB/SIMULINK
Authors: Lei Meng Dong , Xu Shang Long , Lu Jun Jun , Li Wei
Published: November 2012

A jaw mechanism based on the biomechanical findings of human mastication system is being developed to simulate jaw motion and investigate its effect on jaw function to provide the basis for jaw model. Following an investigation into the biological process of mastication, a linear cylindrical actuator is used to replace a group of muscles, and it can act bio-directionally with both origin and insertion attached to the skull and the mandible via spherical joints. The trajectory of the incisal point can be reproduced through programming the six actuations. So it builds the functional `relation between incisal point and six actuators. Co-simulations for motion and control have been conducted using the ADMAS and SIMULINK and the results have indicated that the jaw mechanism enables the jaw behaviors to be reproduced perfectly.
Study on the Time Lag between Steering Input and Vehicle Lateral Acceleration Response under Different Key Vehicle Parameters
Authors: Dong Guang Ming , Chen Jin , Zhang Nong
Published: November 2012

A passively suspended road vehicle rolls outwards under the influence of lateral acceleration when cornering, which is very dangerous under large lateral acceleration. In this paper, time lag between steering input and vehicle lateral acceleration response is systematically studied to implement the active roll control algorithm from the viewpoint of vehicle system dynamics. A 3 DOF yaw-roll vehicle model is established based on vehicle lateral, roll and yaw dynamics. Vehicle parameters of a 1997 Jeep Cherokee is used for parametric study, where the influences of vehicle velocity, steering frequency, mass, length, roll, yaw moment of inertia, position of vehicle centre of gravity, and tyre cornering stiffness are studied via numerical simulation. The analysis results will help improve the real time rollover warning/control algorithm design for vehicle safety.
Anti-Noise Simulation of the Hysteresis Mathematic Model Using Computationally-Efficient GA
Authors: Xue Xiao Min , Sun Qing , Wu Xiao Hong
Published: November 2012

Hysteresis is a particular feature of a wide range of physical systems and devices such as electromagnetic fields, mechanical stress–strain elements and electronic relay circuits. The extended Bouc-Wen model is one of the most widely used hysteresis models in mechanics. It has the capability to emulate the behavior of a wide class of hysteretic systems. However multi parameters have plagued its further application because the capability of computer and algorithm available currently can not meet the need completely. Thus to exploit an effective parallel algorithm is very essential. This paper is committed to propose a novel Genetic Algorithm (GA) so as to identify the parameters of the Bouc-Wen model with noise disturbance efficiently and accurately. Finally a large amount of noise-involved experimental data obtained from a real MR damper is employed to verify the proposed approach has the capability to estimate the satisfactory parameters of the Bouc-Wen model. Also suggested are the implications of the present study on other nonlinear hysteretic models or other complex mathematical models.
Aeroengine Rub-Impact Fault Diagnosis Based on Wavelet Packet Transform and the Local Discriminate Bases
Authors: Wu Ya Hui , Shan Meng Xiao , Qian Yu Ning , Li Xin Liang , Yan Ru Qiang
Published: November 2012

With the development of aeroengine towards the direction of high speed and high performance, the clearance between rotor and stator in aerongine is reduced so that the possibility of rub-impact fault is increased. Since rub-impact signals often exhibits non-stationarity, an integrated approach, which combines the wavelet packet transform (WPT) with local discriminate bases (LDB), is presented in this study to diagnose the rub-impact faults. Specifically, the LDB algorithm is used to select an optimal set of orthogonal time-frequency subspaces resulted from WPT, which have the best discriminatory information for aeroengine rub-impact fault classification. Then the desired parameters generated by the LDB vectors were taken as input to a Bayes classifier for identifying rub-impact faults. Experimental results from the aeroengine vibration signals show that the fault diagnosis method can classify working conditions and fault patterns effectively.