bluuebunny/crossref_metadata_2025 huggingface dataset:
Studies on Building Entrance Cold Adaption Design and Structure in Cold Region - Take Harbin Institute of Architecture as Example
Authors: Cui Peng , Huang Meng
Published: November 2012

The design of public building entrance in cold regions has its particularity. On one hand, this specificity comes from the entrance itself which constitutes complex mechanism, on the other hand, it is derived from the cold regions environment constraints on the range. This article proceeds with the space layout, structure design and material selection by analyses the traditional building technique which used in cold region public buildings, takes cold region traditional representative architecture the Harbin Institute of Technology Museum as example, explains the design countermeasures of the cold area public building entrance in cold adaption construction such as location determination, height difference coordination and other aspects that matters. Proposes the suitable low technology strategy for buildings that can be used in cold area, discusses the overall construction strategy for the future energy saving building in cold region.
The Contrast Experimental Study on Operational Modal Analysis of Ship Structural Model
Authors: Xu Jun Chen , Hong Ming , Cui Hong Yu
Published: November 2012

A ship is a large and multifunctional marine structure operating on the sea. In practice, the environmental noise on a ship has many complicated components and they influence the vibration of the ship structure. Besides the stochastic excitations such as waves and winds, there are also propeller- and host-induced harmonic excitations. In this paper, NExT/ERA algorithm program and a ship model have been made to realize the modal parameters identification of ship structure in the presence of both white noise and harmonic excitations. Moreover, whether the signal filtering technology has a great effect on the results of modal analysis is discussed. In order to study and analyze the influence of the harmonic excitations, experiments under different signal-to-noise ratio (SNR) conditions have been carried out. This has a guiding significance to the engineering practice.
The Evaluation of Design for Energy Efficiency of Buildings Based on Analysis Hierarchical Process and Grey Theory
Authors: Feng Qing , Wu Bo , Jiang Wei
Published: November 2012

Based on the analysis of building energy efficiency features, considering the construction of energy efficiency factors, this paper AHP establish a comprehensive evaluation of building energy efficiency design model based on grey theory. According to the characteristics of the system and basic principles, after comparative analysis of levels of elements, it will introduce 1-9 ratio scale method to construct a matrix. The matrix determines the largest eigenvalue and eigenvector to get the relative weight of various factors. And use grey correlation as a measure to determine the important factors or the optimal solution. This model mainly combines quantitative analysis, qualitative and quantitative analysis methods to overcome the evaluation‘s the subjectivity and arbitrariness, and achieves a scientific and reasonable evaluation of comprehensive energy efficiency design of the building. Finally, this paper designs and develops building energy efficiency evaluation software.
Theory Landscape Architecture Skit the Flower Window Design Culture
Authors: Xu Yi
Published: November 2012

Through the rose window in landscape architecture sketches the form of analysis, are listed in the rose window of the landscape architecture of the space environment to create forms and decorative effect, and discusses the aesthetic culture of landscape architecture, space design flower window. Window flower garden architectural pieces can not be ignored as an important decorative pieces, it tends to reflect the landscape created by emotional factors, a reflection of the cultural origins of the China the tracery Art profound.
Study on Energy Conservation in Rural Residential Buildings in China
Authors: Hu Lei , Zhang Hou Tian
Published: November 2012

Recent years have seen the improvement of economic conditions and living standards of Chinese rural residents. But the problems of waste and pollution have occurred in rural housing construction for heating, lighting and ventilation, damage of ecology, etc. As a result, it is necessary to push energy efficiency in rural housing construction in China. In this paper, the problems existing in rural housing construction are first described, and then the strategies and measures to improve the energy conservation in rural residential buildings are put forward. The solutions to the energy conservation in rural residential buildings in China are those government should play the strengthen leadership role, developing the market of building energy conservation and developing technical foundation s and technological innovations.
Planning of Disaster Prevention Space System Based on Urban Morphology - Take Suzhou Old Urban Area as an Example
Authors: Zhu Ying , Huang Yao Zhi , Jiang Jia Yi
Published: November 2012

Urban morphology analysis is the basis of cognition of city and making plan of disaster prevention space system. According to urban morphology of Suzhou old urban area of the double chessboard of River Street parallel and a moat surround the city, explores the construction of prevention space system combined with urban morphology: disaster prevention units are based on neighborhood in the old area and all kinds of space are organized to form order disaster prevention space system. Exploiting new function of the moat waterfront outside the old area, enhance the capabilities to form a " Resilient function" waterfront space; strengthen the construction of land and water secure channel, ensure that evacuation channels are unblocked in disaster. Combine three different levels of disaster prevention space to construct disaster prevention space systems of Suzhou old urban area. It can strengthen the efficiency of Suzhou comprehensive urban disaster prevention.
Active Vibration Control of a Double-Decker Cantilever Beam Using Shape Memory Alloy
Authors: Yang Xin , Hong Jie , Ma Yan Hong , Zhang Da Yi
Published: November 2012

The feasibility of using shape memory alloy (SMA) as actuators to control the vibration of a double-decker cantilever beam is demonstrated in the paper. A new and reliable form of SMA actuator is proposed in this study that no debonding and softening occurs even the maximum shear is generated by recovery force of the SMA wires. The magnitude and stability of the recovery force are tested when the SMA wires with the prestrain are heated cyclically. According to the simulation results, the four vibrational modes (three bending and one torsional) of cantilever beam can be changed simultaneously. Finally the vibrational response excited by pulsing and sinusoidal signal is successfully suppressed by using the SMA actuators in the experiments.
Traveling Wave Vibration of Rotating Thin Circular Cylindrical Shell
Authors: Liu Yan Qi , Chu Fu Lei
Published: November 2012

In this paper, the vibration characteristics of the rotating thin circular cylindrical shell subjected to the radial excitation are presented. Based on the Love’s shell theory, the governing equation of the rotating thin circular cylindrical shell is derived by using the Hamilton’s principle. Then, the amplitude-frequency responses for traveling wave vibration of the circular cylindrical shell are investigated. The results indicate that there exists the traveling wave vibration for the rotating thin circular cylindrical shell, namely: the forward wave and the backward wave. The effects of the damping and excitation on the amplitude-frequency response are analyzed.
Reconstruction of Sound Field Based on Mono-Poles Array Modes
Authors: Nie Yong Fa , Zhu Hai Chao , Mao Rong Fu
Published: November 2012

To effectively reduce radiation noise of the structures, the information detailed of the acoustic field is required. An approach of acoustic field reconstruction based mono-poles array modes is developed. The acoustic source is expressed as the form of some mono-poles array superposition which is defined as mono-poles array radiation mode. The amplitudes of these mono-poles are equal and their phase angles are in phase or out of phase in each array form. The amplitudes of mono-poles array modes are obtained by means of the complex pressures measured in near field, and then the whole acoustic field can be reconstructed. Feasibility of this approach is verified through a numerical example of a single-point harmonic excited and simple supported plate and the error analysis shows that the near field reconstruction result is accurate and the far field reconstruction result is more accurate.
Optimized Fuzzy Neural Networks Control of a Magnetic Suspension Vibration Isolation System
Authors: Song Chun Sheng , Hu Ye Fa
Published: November 2012

Active vibration isolation technology can overcome the defects of passive vibration isolation technology that the poor vibration isolation performance in low and resonant frequencies. Compared with other active vibration isolation technologies, magnetic suspension isolation technology has shown useful characteristics, such as wide response frequency range, fast response, high reliability and long-life. However, the control of MSVI is still one of the areas that require further investigation. This paper presents a Fuzzy Neural Networks(FNN) control algorithm for a magnetic suspension isolation vibration system, which is optimized by improved Genetic Algorithm(GA). The output force responses of the FNN and passive vibration isolation system under same excitation are simulated. The simulation results show that the fuzzy control system has much better performance in vibration isolation.
Application of Dynamic Vibration Absorber in Noise Control of Whole Vehicle
Authors: Xu Xue Ying , Han Guo Hua , Ma Zha Gen
Published: November 2012

As cars become quieter the sound quality of components becomes more critical in the customer perception of car quality. Considering that middle frequency noise plays an important roll for internal noise, the noise signals in the range from200Hz to 500Hz are specially emphasized. Then the acoustic evaluation parameters, such as Sound Pressure Level, Acceleration have been evaluated. Judged from experiences and measuring results, an abnormal noise comes from engine mounts, through the use of dynamic vibration absorber on engine mounts, Vibration on engine mounts and Sound Pressure Level in interior vehicle were greatly improved. At the same time, subjective evaluation also indicated that there was no complaint any more in passenger compartment. Dynamic vibration absorber can properly solve the abnormal noise.
Research on Vibration Angle of Six Degree-of-Freedom
Authors: Li Chun Zhi , Chen Ying , Liu Qing Lin
Published: November 2012

Based on fiber optic gyroscope technique new method of rotation angle testing in three-axis vibration is proposed in this paper, and the theory of fiber optic gyroscope is introduced as well. According to the measurement accuracy requirement, the angle testing system of FOG is designed by analyzing the environment of three-axis vibration. It was applied in experimental investigation of rotation angle in three-axis vibration with the FOG testing system and the real-time angular rate signal was processed by frequency analysis. The results of practical application show that it is feasibility and validity of angle testing method by means of FOG technique.
The Study of Sound Quality for Car Compressor
Authors: Hou Yan Fang , Han Guo Hua , Xu Xue Ying
Published: November 2012

As cars become more and more quiet the sound quality of rotary components such as car compressor becomes more important in the customer’s subjective perception of passenger car quality. This needs a new evaluation method which is not only the traditional method like sound pressure level but also Psychoacoustic Metrics to focus the specification of component sounds. This paper on one hand analyzed one car’s abnormal noise reason through the tests, found the main problem frequency band of the compressor, and on the other hand studied the compressor’s psychoacoustic metrics. In this paper the countermeasure of solving this problem was also given, and then noise level and psychoacoustic parameters are compared. Both objective evaluation and subjective evaluation showed that the compressor with the solution not only reduced the sound pressure level, but also improved the car sound quality greatly.
Prediction of Wave Attenuation across Multiple Joints with an Improved Elastic Nonlinear Model
Authors: Song Bo Xue , Yu Jin , Cai Yan Yan , Chen Xu
Published: November 2012

The study on nonlinear displacement discontinuity model has been investigated in the researches of normal incident wave attenuation across rock joints. But the studies were limited only on the effects of joint with single type deformation behavior, without considering the influence of different extent in model nonlinearity. The improved elastic nonlinear normal deformational model can descript the extent of nonlinearity quantitatively. Based on this model, a displacement discontinuity model for normally incident wave propagation across multiple parallel joints was established in an elastic half-space. Using one-dimensional wave equation characteristics method, the time-domain numerical difference scheme of transmitted particle velocity was proposed, making computational programs to obtain semi-numerical solutions, and transmission coefficients. Parameter studies were conducted to get an insight into the effects of number of joints and the extent of nonlinearity, the incident wave maximum amplitude on transmission coefficients and transmission energy rate, waveform distortion and delay time.
Analysis on Oil Whip of Steam Turbine
Authors: Peng Xiao Lu , Qian Jin , Zhang Bin , Peng Rui Xiong
Published: November 2012

Oil whip, which is one of the typical types of steam turbine failure, may lead to large amplitude vibration of the rotor and even to catastrophic accident. In order to prevent and on-line eliminate the oil whip, researches on vibration of steam turbine caused by the oil whip and its characteristics have been elaborated from two respects of theory and experiment. The causes and the formation mechanism of the oil whip have been analyzed, and in certain conditions, a series of experiments for the oil whip on the rotor experiment rig have been made. Illustrating and summarizing the results of these experiments by change the rotor speed and the lubricant quantity. These researches on the oil whip could provide some theoretical bases for the practical work. Along with the expounded prevention measures of oil whip, some ideas on oil whip online elimination are put forward.
An Improved Mixed-Radix FFT Technique and its Application in Frequency Spectral Analysis
Authors: Li Jian Bo , Wang Ji Dong , Fu Bing , Lin Gao
Published: November 2012

Numerical analysis methods in time-domain and frequency-domain are commonly considers as two important ways for seismic evaluation of structure responses. FFT plays a unique role in building the equivalent expression between the structural dynamic signals in time domain and frequency domain, such as computing frequency spectrum values at discrete frequency points for time history data. On the basis of radix-4 and radix-2 FFT techniques, an improved district fast Fourier transfer FFT is presented in this paper to improve the transform efficiency, in which radix-4 transform is applied in most iterative steps, besides radix-2 transform used in the last one iterative step. As compared to the traditional radix-2 FFT, the new mixed-radix FFT leads to distinct reducing in computing amount, while the equivalent precision and the same discrete frequency points remain. Also by taking the trigonometric coefficient method as theoretical results, it’s numerically validated through some examples that the new improved FFT transform technique suits the engineering application of the fast numerical transform in the time and frequency domain for structural frequency spectral analysis.
Research on Semi-Active Suspension System with Variable Stiffness and Damping
Authors: Pan Gong Yu , Fan Fang Qiang
Published: November 2012

Based on the semi-active suspension system with variable stiffness and damping, the full vehicle model was established in Adams/Car software, which included front suspension and rear suspension with variable stiffness and damping, steering system, car body and tires model. The variable universe fuzzy controller of semi-active suspension was designed according to variable universe fuzzy theory, which was compared with the traditional fuzzy controller. The co-simulation model was built by Matlab/Simulink and Adams/Car software. Then the model was simulated and analyzed in the inputs of random road and roof road. The results of the co-simulation show that, compared with the full vehicle model with passive suspension, the full vehicle model with variable stiffness and damping semi-active suspension effectively reduced the vibration of car body and improved the vehicle ride quality, and the variable universe fuzzy controller is better than the traditional fuzzy controller in decreasing vibration.
Modal Identification Method Based on Natural Pulsation Excitation
Authors: Jiang Xiu Juan , Wu Jun Yan , Liu Jian Xin
Published: November 2012

It’s important to identify structural modal parameters, especially, accurate modal shapes in time domain for accurate damage identification and health monitoring of structures. The natural excitation vibration is used to identify the structural modal parameters. The power spectral density curve has obtained according to the measuring point vibration time domain curve, and then natural frequencies and vibration value are determined by the curve peak. The reference point is taken for the vibration unit values to normalize other modal shapes. The modal shapes are calculated using the phase measuring point relative to a reference point. After the finite element analysis and calculation, and the measured modal is compared with it. The results show that the dynamic performance of the bridge is reliable because the measurement method and the finite element method are basically consistent. The damping ratio of the bridge is larger dispersion but the average damping ratio is in line with the rules and scope of the cable-stayed bridge.
Analysis on Static Characteristic of HTC100 NC Lathe Bed
Authors: Lu Mo Wu , Zhang Guo Ming
Published: November 2012

HTC 100 CNC lathe is a heavy machine tool. The lathe bed is the important part of the machine tool. The static characteristic of the lathe bed directly influence the machining accuracy and production efficiency of the machine tool. At present, the lathe bed design general depends on the designer’s experience. In this paper, the static analysis of the HTC100 CNC lathe bed is carried out with ANSYS 12.0. The node equivalent stress distribution cloud, the total deformation distribution of Lathe bed and the maximum distortion under various kinds of working conditions are obtained. According to the result, the structure of lathe bed design tends to conservative and the distribution of static stiffness is unreasonable, which is necessary to optimum design.
A Dynamic Analysis of Reciprocating Compressor Transmission Mechanism with Joint Clearance
Authors: Zhao Hai Yang , Xu Min Qiang , Wang Jin Dong , Chen Gui Juan
Published: November 2012

The dynamic behavior of a reciprocating compressor transmission mechanism with joint clearance is studied in this paper. A transmission mechanism virtual prototype model is built under software ADAMS. Revolute joint between connecting rod and crosshead pin is modeled with clearance by contact model based on the so called Impact-function, and four processes of cylinder pressure load is simulated by the IF function. Cylinder pressure load, amplitude of joint clearance, crank speed and flexibility of connecting rod is taken as influence factors. Four different cases were simulated. Joint contact forces, accelerations of compressor block and journal centre path are used to analyze the dynamic behavior. The presented results show that these factors play a significant role of dynamic behavior of mechanisms.
The Rotor Dynamic Analysis and Optimization in Turbocharger
Authors: He Na Na , Zhang Hong
Published: November 2012

In this paper the rotor dynamic characters of the bearing system in turbocharger are researched. The computing method of rotor dynamic is also analyzed. Through modeling the components and parts of bearing system and rotor dynamic model, the three critical speeds are computed and analyzed. By comparing the working speed and critical speed, we can judge that whether the turbocharger works nearby the critical speed or not. If it does, then how to make the turbocharger work stably is also researched. At the same time, how the key design parameters, such as the shaft length and diameter, impact on rotor dynamic character is discussed in detail. In the end, an optimization strategy of the rotor structure is proposed to make the working speed be away from the critical speed.
Impact Dynamics of Multi-Link Robots with Link and Joint Flexibility
Authors: Qian Zhen Jie , Zhang Ding Guo
Published: November 2012

The dynamic analysis of a flexible-link-joint robot colliding with its environments is presented in this paper. Kinematics of both rotary-joint motion and link deformation is described by 4×4 homogenous transformation matrices. Both the stretching deformation, bending deformation and the torsional deformation of the flexible links are considered. Furthermore, the flexibility and the mass of the joint are considered too. The concept of impact force potential energy is introduced, so that the generalized forces due to the impact force can be computed easily. The Lagrange dynamic equations are used to establish the complete mathematic model of the system with impact. Dynamics simulation of a spatial flexible-link-joint manipulator arm is given as an example to validate the algorithm presented in this paper. And the numerical results indicate that the flexibility of the link and joint have distinguished influence on the impact dynamics of the flexible robots.
Study on Calculation Method of Dynamic Response of Structure Subjected to Harmonic Load
Authors: Lu Yun Xiang , Lou Ze Fang , Liu Bo , Pan Xiao Cheng
Published: November 2012

This paper puts forward pseudo-response spectrum method for calculating the dynamic response of structure caused by harmonic load on the floor, and proposes to use frequency ratio as a new modal truncation index. Combined with engineering practice, the analysis results of pseudo-response spectrum method were compared with the results of existing dynamic coefficient method and elastic time-history method. The contrast results show that dynamic coefficient method due to lacking of considering dynamic properties enough was not able to meet the real response and could not evaluate the comfort of the vibration. The results of pseudo-response spectrum method with suitable mode combination method have the same law of the maximum enveloping value as elastic time-history method. This proved that pseudo-response spectrum method is reasonable, safe and economical, which can provide the basis for engineering design.
Fault Feature Extraction Method of Large Rotating Machinery
Authors: Jiang Zhang Lei , Xu Xiao Li , Chen Peng
Published: November 2012

Working condition of large rotating machine is varying. The collected vibration signals contain fault information as well as non-fault information, like load change and noise. The traditional fault feature extraction method which based on energy changing has certain limitations; therefore, new fault feature extraction method based on Fast ICA will be researched. Separating independent signals from blind signals by adopting Independent Component Analysis(ICA), purifying fault information and suppressing interference information; and the lifting wavelet packet is used for acquiring time frequency domain feature band from signals, so as to solve the difficulty that the fault information of the variable working condition rotating machine is always submerged by irregular working condition changing information such that effective fault prediction is hard to carry out.
Blind Extraction of Correlated Fault Sources Based on Constrained Non-Negative Matrix Factorization
Authors: Li Ning , Chen Hai Ting
Published: November 2012

Blind source separation (BSS) has been successfully used to extract undetected fault vibration sources from mixed observation signals by assuming that each unknown vibration source is mutually independent. However, conventional BSS algorithms cannot address the situation in which the fault source could be partially dependent on or correlated to other sources. For this, a new matrix decomposition method, called Non-negative Matrix Factorization (NMF), is introduced to separate these partially correlated signals. In this paper, the observed temporal signals are transformed into the frequency domain to satisfy the non-negative limit of NMF. The constraint of the least correlation between the separated sources is added into the cost function of NMF to enhance the stability of NMF, and the constrained non-negative matrix factorization (CNMF) is proposed. The simulation results show that the separation performance of CNMF is superior to the common BSS algorithms and the experiment result verifies the practical performance of CNMF.
Compound Fault Feature Separation of Rolling Bearing Based on Complex Wavelet and Energy Operator Demodulation
Authors: Yang Yang , Zhang Jian Yu , Zhang Sui Zheng
Published: November 2012

Compound fault feature separation is a difficult problem in diagnosis field of mechanical system. For the rolling bearing with compound fault on outer and inner race, feature separation technology based on complex wavelet transform and energy operator demodulation is introduced. Through continuous wavelet transform, coefficients of mixed fault signal can be achieved in different wavelet transform domain (i.e. real, imaginary, modulus and phase domain). Furthermore, wavelet power spectrum contours and time average wavelet energy spectrum are applied to extract the scales which hold rich fault information, and the wavelet coefficient slice of specific scale is also drawn. For wavelet coefficients in different domain, spectrum analysis and energy operator demodulation can be used successfully to separate mixed fault. The comparison of feature extraction effect between complex wavelet and real wavelet transform shows that complex wavelet transform is obviously better than the latter.
Analysis of Underwater Projectile Experiment Using One Stage Light Gas Gun and Numerical Simulation
Authors: Wang Bai Qiu , Wang Cong , Huang Hai Long , Xing Yan Jiang , Zhang Jia Zhong
Published: November 2012

One stage light gas gun is an important device for experiments of low-speed supercavitation projectiles. After a reasonable simplification to the gas gun, movements of the projectile in the barrel have been analyzed and the relationships between the initial pressure of the gas gun and the exit velocity of the projectile were obtained. For meeting the velocity difference between at the gun exit and water-entry, a speed impairment factor was employed. The results of the adiabatic analysis of the simplified gun show that the best ratio between gun chamber volume and the barrel length is related to the gas thermodynamic process and the gas residual pressure has relation to the gas thermodynamic process. The low-speed supercavitation projectile experiments have been carried out. The movements of the projectile in the gas gun and the supercavitation shape and projectile speed after water-entry have been numerically simulated.
A Dynamic Optimization Design Method for the Turbine Engine Frame Foundation
Authors: Li Zhao Jun , Wang Xi Cheng
Published: November 2012

An effective optimization method using Kriging model and parametric sampling evaluation strategy is proposed to solve dynamic optimization design. The optimization problem is to find the design variables such that the structural weight is minimum and dynamic displacement of the points concerned plus certain side constraints are satisfied. The types of design variables are considered as the sizing variables of the beams and columns. Kriging model is used to build the approximate mapping relationship between the forced vibration amplitude and design variables, reducing expensive dynamic reanalysis. A dynamic analysis program is used as black-box to obtain dynamic response. Numerical examples show that the method has good accuracy and efficiency. Versatility of this method can be expected to play an important role in future engineering optimization problems.
Vibration Suppression of a Saturation Control System Using Delayed Feedback Control
Authors: Zhao Yan Ying
Published: November 2012

In the present paper, the delayed feedback control is applied to suppress the amplitude of the vibration of a beam. The method of multiple scales is employed to obtain the analytical solutions when the primary resonance and 1:2 internal resonance occur simultaneously. The predictions from analytical solutions agree with the numerical simulations well. The analytical results show that the amplitude of the beam of the saturation control is much larger than its amplitude of the single-mode motion. The effects of the delayed feedback control on amplitude of the beam are investigated when the original system is in the saturation control. There is a tunable range of the delay could be used to suppress the amplitude of the beam for a fixed value of the gain. The amplitude of the beam can be suppressed from 0.20 to 0.10 when the gain and the delay are chosen appropriate values.
Research on Fatigue Life Prediction of Planetary Cage in Caterpillar Base on Running Simulation Test
Authors: Du Xiu Ju , Jia Chang Zhi , Wu Jing
Published: November 2012

Planetary cage in caterpillar is designed with the static strength theory. While the dynamic characteristics of planetary parts in different working condition is difficult to obtain with the limit of traditional method, so research on reliability and fatigue life prediction of planetary cage is very difficulty which result that designed life is much longer than practical life. The reliability of caterpillar is affected deeply. The dynamic loads suffered by planetary cage in different working condition is obtained based on running simulation with MSC.ATV, and then the fatigue life of planetary frame is calculated with fatigue life prediction system of planetary cage. The study case proves the new method is feasible. Research on planetary cage in caterpillar based on running simulation test resolve not only the technical problem of loads in different work condition but also close connection with engineer, so the research have very important utility significance.
Influence of Transition Layer Position on Seismic Performance in Multi-Story Buildings of SRC-S Vertical Hybrid Structures
Authors: Huo Hao , Cao Ping Zhou , Wu Kai , Min Ming Bao
Published: November 2012

When vertical hybrid structures of steel reinforced concrete-steel (SRC-S) are used in multi-story and tall buildings, the connection between the two structural systems would probably dissatisfy the seismic request because of the abrupt change of stiffness. Setting up a stiffness-transition-layer is an efficient way to improve the seismic performance. In this paper, elastic and elastic-plastic analysis was conducted on a six-floor frame structure by Midas software. In the building, concrete encased shape steel was applied as the transition layer. By comparative analysis, we tried to find out how different transition layer positions could affect seismic performance in SRC-S vertical hybrid structures. Given the results, transition layer position has great influence on the story drift angle, story drift and the development of the plastic hinges. The suggestion on transition layer position was proposed to provide a reference for seismic design.
Damage Detection of Concrete Structure Based on Approximate Entropy
Authors: Xie Zhong Kai , Liu Guo Hua , Zhang Zi Hua
Published: November 2012

A method based on Approximate Entropy (ApEn) Theory is proposed to assess the damaged condition of concrete beams from the vibration signals generated by means of excitation on beams. The presented method no longer concerns about identifying modal parameters of the structures but about estimating the regularity of the time series. Simply-supported concrete beams were monotonously damaged and followed with an investigation of the vibration signals generated from the excitation on these damaged beams. The ApEn method was successfully employed to the generated signals for an assessment of the damage status of concrete beams. In addition, comparative studies between traditional method (Wavelet Transform) and ApEn method show that the latter is capable of capturing the deterioration of these concrete beams with more sensitive characteristics. The ApEn method proposed is of great promise to be applied in real concrete structures.
Study on Earthquake Resistant Performance of a Large Span Structure Strengthened with HADAS
Authors: Yao Yong , Deng Yong Jun , Chen Dai Guo , Wang Hai Jun
Published: November 2012

After the "5.12 wenchuan" earthquake, the fortification intensity of part of the affected areas has adjusted, most of the structures especially the Public buildings need to reinforcement after the fortification intensity was adjusted. In this paper, based on a sports teaching training center which is building when the earthquake happening, with the particularity of the fortification intensity increased, evaluated the seismic performance of the structure before and after fortification intensity increased, and dynamic analysis on the finite element model of different HADAS reinforcement schemes has been done, then evaluated the shock absorption effect under different reinforcement schemes. The results show that: 1) HADAS has important role to adjust the vertical stiffness, enhance the capability of energy consumption, and improve the damping performance of structure; 2) HADAS should decorate in the layer which has larger inter-story displacement angle, that is the neighboring story of stiffness changes greatly; 3) the number and arrangement mode of the HADAS has optimal solution and so on.
Dynamic Reliability Analysis on Arch Dam by Considering Random Elastic Modulus
Authors: Chen Hong Jie , Wu Qing Xi , Zhen Hong Feng
Published: November 2012

Due to the massive volume of body and complex structure, the dynamic reliability analysis on arch dam under earthquake action draws more attention. In this paper calculated seismic dynamic action on arch dam by applying mode superposition response spectrum method. By taking the elastic modulus of the dam concrete and the rock foundation beneath the dam, and concrete tensile and compressive strength as random variables, adapting response surface method to establish limit state equation. The reliability index of each element in the dam was calculated via gradient optimization method, as a result to obtain the variation law of reliability index of dam body. The calculation of real case shows that the tensile index is comparatively low at some region of dam heel and abutment upstream, which requires the measure for aseismic measures, while the reliability index for tensile and compressive stress on other part of dam generally meets requirement.
Effect of Crack-Depth Ratio on Double-K Fracture Parameter of Reinforced Concrete
Authors: Hu Shao Wei , Mi Zheng Xiang , Lu Jun
Published: November 2012

In order to study the influence of the crack-depth ratio on reinforced concrete fracture parameters and the resistance of the reinforcing bar to crack propagation in concrete, the fracture tests were carried on by using four groups three-point bending specimens with initial crack-depth ratios of 0.2, 0.3, 0.4 and 0.5 in this paper. An analytical model was presented to calculate fracture toughness of reinforced concrete by analyzing crack propagation process of the three-point bending beams. The formula of calculating effective crack length of reinforced concrete was established. The research results show that the double-K criterion can be used for describing crack propagation process of reinforced concrete by introducing fracture toughness, which is suitable for reinforced concrete. Initiation fracture toughness and unstable fracture toughness of reinforced concrete slowly increase with the increase of crack-depth ratio, which is different from the properties of ordinary concrete. The reinforced can improve the ductility of concrete obviously and inhibit the rate of crack propagation well.
Experimental Study on Seismic Performance of Non-Dispersible Underwater Concrete Short Columns
Authors: Sun Dao Ming , Kang Hai Gui , Lu Yun Fang , Zhong Wei Qiu
Published: November 2012

The mechanical properties of non-dispersible underwater concrete short columns and the common concrete short columns under low cyclic reversed loading were carried out by experimentation in this paper. The results showed that, the seismic performance of non-dispersible underwater concrete short columns and the common concrete short columns are similar, so the seismic performance of non-dispersible underwater concrete short columns can be calculated by the seismic theoretical of the common concrete short columns.
Seismic Fragility Analysis of Reinforced Concrete Frames Based on the Service Age Variation
Authors: Wang Neng Jun , Wang Jian Min , Jiang Wen Ting
Published: November 2012

The seismic fragility of R/C frames was redefined as the conditional failure probability of the structure with regard to the ground motion index and structural service age in this paper. An analytical method was proposed to disclose the seismic fragility variation of reinforced concrete frames with respect to the service age. Considering the variation of nonlinear mechanical characteristics of un-carbonated concrete within the service life, the seismic fragility variation of frames was analyzed using the inter-story drift ratio in the weak storey. For the defined damage levels of frames, each seismic fragility curve variation reflects the failure probability change tendency within the service life. A R/C frame was modeled to illustrate the variation of the seismic fragility within the service life.
Experimental Study on Bending Behavior of the Wood Beams in Historic Building with CFRP Sheets
Authors: Meng Nai Qing , Deng Chuan Li , Jia Ding Zhen Weng , Jia Bin
Published: November 2012

Through the trisection loading test on two hundred-year-old wood beams reinforced with single-layer and double-layer CFRP sheets along the bottoms, the reinforcement effect of CFRP on the bending behavior of the wood beams with corrosion damage has been analysed, and the influence of the number of the CFRP layers on the reinforcement has been researched, thus obtaining the bending behavior of the wood beams reinforced with CFRP and the influence of the defect of the wood beams with the reinforcement.
Seismic Behavior of Super High-Rise Frame-Core Wall Structure
Authors: Yuan Ji Xing , Zhang Qing
Published: November 2012

In this paper a super high-rise frame-core wall as an example, It was analyzed the frame-core wall structure system under action of earthquake force features, set reasonable seismic performance objectives, analysis the structure reasonable failure mode, made it have enough bearing capacity and ductility for a reasonable design of frame and coupling wall-beam, could make the frame-core wall structure with multiple seismic fortification lines, improve the seismic performance of the frame-core wall structure. Finally, the action of earthquake deformation and seismic shear force distribution was analyzed through the elastic dynamic time-history analysis. After a reasonable optimization analysis showed: Frame-core wall structure could have three seismic fortification lines: coupling beams, core wall, frame structure, and had enough energy dissipation ability at the same time, could form the rational failure mode, improved the seismic performance of the structure.
The Corrosion of Concrete Shaft Lining of Mine and its Related Research Progress
Authors: Yang Yi Ting , Ji Hong Guang
Published: November 2012

With the extensive use of concrete materials, concrete corrosion as an important hazardous factor of engineering safety and its impact on the engineering safety is receiving attention gradually. In order to study its impact on the safety of mining engineering, this paper summarized the corrosion factor of concrete shaft lining of mine and its research progress, and combined with the actual progress of the concrete corrosion. The author came to the conclusion that we should pay attention to the study of the corrosion of concrete shaft lining of mine, at the same time, analyzed the feasibility of the study. The authors believe that, at the present stage, studies of concrete corrosion are more comprehensive and thorough, and coupled with the comprehensive understanding of the underground environment. It is perfectly placed to study the problems of the corrosion of concrete shaft lining of mine deep and systematically.
The Bionic Vibration Damping Technology and its Inspiration for the High Speed Milling Cutter
Authors: Lv Hong Qing , Tang Wei Xiao , Song Qing Hua , Sun Shan Shan
Published: November 2012

A review of research on the vibration control technology inspiration from the biological vibration damping mechanisms is described. First the important concept and background of the bionic vibration damping technology are briefly introduced. Then the basic theories and its applications in the engineering fields are elaborated from three aspects: vibration damping mechanisms of the creatures own the good ability to withstand the ambient vibrations, mechanical models of biological prototypes and its application progress in the practical occasions.
Solar Wireless Charging Circuit System Designing
Authors: Li Su Ping , Chen Xiao Fei
Published: November 2012

The solar wireless charging circuit system based on resonance coupling power wireless transmission is aimed at addressing long wire, complex manual operation of wire charging type and short-distance, low efficiency of general electromagnetic induction-type power wireless transmission. Solar is conversed to electricity by photoelectric conversion then the electricity passes the following processing circuit: solar power supply circuit, power wireless transmission circuit and lithium battery charging circuit to complete lithium battery charging finally. The proposed circuit system owns perfect long-distance transmission, safe-operation, automotive rechargeable, flexible and efficient etc basic features and preventing over charge and over discharge double protection performance.
Design and Experimental Research on Evaporation-Type DPF Regenerative Burner
Authors: Liu Hong Wei , Yao Guang Tao , Jiang Da Hai , Zi Xin Yun , Guo Zi Rong
Published: November 2012

Diesel engine for automobile mainly adopts diesel particulate filter (DPF) method to deal with the exhaust particulate. In order to eliminate the particulate in the filter and complete DPF regeneration, the burner needs to be set at the entrance of DPF. This paper designs the evaporation-type DPF regenerative burner, and makes the bench and the real vehicle test. The test shows that the burner can complete DPF regeneration well within the working scope of the larger engine.
Cell Performance of ABPBI-Based High Temperature PEM Fuel Cells
Authors: Yan Wei Mon , Chen Hsin Hung , Jung Guo Bin , Lee Chun I , Yang Chang Chung
Published: November 2012

In this work, the cell performance of high temperature PEM fuel cells based on ABPBI membranes was experimentally measured in details. The ABPBI-based high PEM fuel cell was fabricated by using ABPBI-based gas diffusion electrodewith directly adding carbon-supported- catalyst to a homogeneous ABPBI solution prior to deposition and its membrane electrode assembly. The effects of various Pt loading of the catalyst layer, as well as the effect of different operating conditions were studied. The cell performance was evaluated using dry hydrogen/oxygen gases, which added advantage of eliminating the complicated humidification system of nafion cells. The measured results reveal that a catalyst layer with the higher Pt loading has a higher cell performance. In addition, better cell performance is noted for a case with higher cell temperature or higher cathode flowrate.
Comparative Analysis the Stainless Steel Surface Structure on Fine-Blanking with Negative Clearance and Common Blanking
Authors: Du H. , Li F. , Zhang H.
Published: November 2012

The stainless steels are used more and more in blanking process. To further enhance the quality of blanking fracture surface, this paper made the related experiments of fine-blanking with negative clearance in stainless steel. Through the comparison analysis between the fine-blanking microstructure and common blanking one with stainless steel, the result points out that the fine-blanking with negative clearance inhibit the warping in common blanking, make the work-hardening of material fracture surface improves, and which can have a more positive effect for the fine-blanking with negative clearance. Meanwhile, the work-hardening capacity of two blanking methods was different, and it can enhance the punching section entire strength commendably by fine blanking with negative clearance.
A New Method to Detect Harmonics and Inter-Harmonics Based on Hilbert Marginal Spectrum
Authors: Gong Mao Fa , Li Guo Liang , Xia Wen Hua , Liu Qing Xue , Wang Jing Jing
Published: November 2012

Aiming at the problem that harmonic pollution is becoming more and more serious in power system, a new method to detect harmonics and inter-harmonics based on Hilbert marginal spectrum is proposed in this paper. Firstly, the original signal is decomposed into several Intrinsic Mode Functions through Empirical Mode Decomposition. Then Hilbert marginal spectrum is obtained through Hilbert Huang Transform. It contains the information of signal’s harmonics frequency and those amplitudes. Finally, both harmonics and inter-harmonics are detected by this method. Fourier transform lacks the ability of time-frequency analysis. Wavelet transform is affected by the selection of wavelet base. This method overcomes these shortages and can detect the component of each harmonic quickly and accurately. Simulation result verifies that this method can meet the requirement of voltage and current distortion detection in power system.
Analysis and Optimization of Magnetic Energy Converters for Wireless Sensors in Substation
Authors: Cheng Yan , Huang Jin Xin , Yu Chun Hui , Zhang Li
Published: November 2012

With the development of wireless sensor networks, energy supplying problem become critical. However, energy scavenging technology provides an efficient solution method, and it is the principal element for wireless sensors to facilitate on-site self-powering. A magnetic energy converter which can convert magnetic field energy to power is proposed when there is sufficient magnetic energy in substations. By modeling this converter, the inductive factor was defined to present energy harvesting capability and optimization was realized in terms of framework material, structural parameters and turns of coils. The research results present theoretical basis for optimal design of the energy scavenging devices.