bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Wind Tunnel Force Balance Tests of Long-Span Closed Coal Trestle
Authors: Wang Shu Liang , Liang Shu Guo , Zou Liang Hao , Zhou Xiang Yang
Published: December 2013

Structures with long span and high flexibility are very sensitive to the wind forces, so it is necessary to study on the wind effects on such structures. In this paper, based on section model wind tunnel high-frequency force balance tests, two horizontal base bending moments and shear forces of the typical supporting columns as well trestle bridge deck of the closed coal trestle under different wind directions were measured. The shape coefficients and their variations with the wind directions of the typical supporting columns as well trestle bridge deck were calculated then analyzed by the mean values of base forces. The experimental values of the shape coefficients were compared with those in the Chinese Load Code, the results shown that both were in good agreement, which verified the reliability of the test, which also illustrated that wind-resistant design of the coal trestle in accordance with the Code was reasonable. Based on analysis of the variances of base forces between overall model with and without surrounding buildings, influences of surroundings buildings were studied. Interference factors were proposed which provided the basis for the base forces checking and wind-resistant design of the long-span closed coal trestle structures.
The Design of Blasting Demolition of the Reinforced Concrete Chimney Based on Complicated Conditions
Authors: Zhang Chun Li , Wang Bo , Zhu Yan Zhi
Published: December 2013

Reinforced concrete chimney lining initiation time should be slightly behind the outer wall. Adopting blasting scheme of preliminary demolition and big blasting cut is helpful to control the collapse of chimney and reduce the blasting vibration directions. Combined with a real blasting engineering, blasting demolition design of the reinforced concrete chimney under complex environmental condition was introduced.
Test Installation of a Marker-Based Framework for Structural Health Monitoring of Bridges
Authors: Magdics Milán , Garcia Ruben Jesus , Wattanasoontorn Voravika , Sbert Mateu
Published: December 2013

Regular health monitoring of bridges is a vital process to prevent serious structural damage. Marker-based systems, which follow the trajectory of objects by placing a well-characterized pattern on their surface and identify them on photos or videos taken of these objects, have proven to be a cheap and flexible alternative for such tasks. In this work, we extend our previous laboratory implementation with a low-cost, fully automatic on-site installation at the bridge at Arosa Island, Galicia, Spain. Preliminary results presented in this paper show that our system is highly robust for the harsh climate of the installation site.
Aerodynamic Testing of Bridge Structures
Authors: Churin Pavel , Poddaeva Olga I.
Published: December 2013

This paper shows the relevance of aerodynamic testing of bridge structures, lists the main documents regulating them, and describes the main features and procedures of these tests.
Research on Automatic Safety Monitoring System for Artificial Islands
Authors: Jiao Zhi Bin , Tan Hui Ming , Zhang Shu Hong , Mei Tao Tao
Published: December 2013

To meet the needs of the security for the oil and gas production, the safety monitoring methods and technical requirements for the artificial islands in coastal areas during the operation periods are presented. This thesis constructs on the basis of safety monitoring during artificial island operation periods in Jidong Nanpu ilfield, which develops and establishes automatic safety monitoring system of artificial island in China for the first time. The result of preliminary operating shows that the artificial island 1-3# exhibits obvious differential settlement and shrinkage phenomenon during the operation periods. The research results provide ten technical basis and guarantees for the safety construction and management of artificial islands .It will play a guiding role in the safety monitoring during the operation periods.
Multiple Stepwise Regression Analysis Crack Open Degree Data in Gravity Dam
Authors: Shen Wei Wen , Ren Jian Min
Published: December 2013

This research mainly focuses on the analysis of factors influences on gravity dam open crack on the basis of theoretical regression equations. It calculated the equations with multiple stepwise regression and selected factors that had significant influence on gravity dam crack to form the model equations. Moreover, it evaluated the reliability and accuracy of model equation through statistical parameters and chart to get a reasonable analysis.
The Properties of High-Strength Concrete Containing Super-Fine Fly Ash and Limestone Powder
Authors: Hu Jin , Li Meng Yuan
Published: December 2013

In this study, a high-strength concrete containing 25% super-fine fly ash and 10% limestone powder was prepared, and its properties were investigated by comparing with those of pure cement concrete. The results show that the concrete containing super-fine fly ash and limestone powder can get a larger initial slump and a smaller slump loss than the pure cement concrete with the same super plasticizer content. In the case of almost the same 28 days' compressive strength, the concrete containing super-fine fly ash and limestone powder exhibits a lower adiabatic temperature rise, a lower early strength, a higher late strength, a lower permeability, and a larger carbonation depth than the pure cement concrete.
Research on Secondary Cooling Technology for Billet of HRB500E Vanadium-Containing Steel Rebar
Authors: Tian Peng , Zhong Zhi Yong , Bai Rui Guo , Zhang Xing Li , Wang Quan Li , Gao Hai , Hu Xin Guang
Published: December 2013

Hot ductility of HRB500E vanadium-containing steel rebar was study with thermal simulation test and the secondary cooling model was established based on the relationship between the cooling water and the casting speed. The solidification cooling curves and the temperature fields of HRB500E were simulated with the PROCAST software. The result of the hot ductility and the pin shooting experiment shows that the casting straightening temperature should be above 902 °C and the secondary cooling model was feasible and accurate. Finally the high-quality billet of HRB500E was obtained.
Research on Multivariate Composite Super early Strength Grouting Materials
Authors: Zhang Xiao Ping , Sun Chang Zheng , Zhao Tong Feng
Published: December 2013

Super early strength high performance grouting material was produced using high alumina cement, ordinary portland cement, gypsum and silica fume. The different glue sand ratio and the cement sand ratio 1.0 mix microstructure were studied systematically. The results showed that the system with a variety of admixture using hingh mortar ratio can be prepared for the initial flow ratio greater than 325{mm},, 30min flow greater than 280{mm}, 2h compressive strength 34.80{MPa}, 24h bending over 13.82{MPa}, 28d compressive strength greater than 99.90{MPa}, 28d compressive strength greater than 56d compressive strength. The system of early SEM microstructures showed good crystal growth, structure compact.
Thermal Stability of Tilt Grain Boundaries in Graphene
Authors: Mendez J.P. , Macias F. , Ariza M.P.
Published: December 2013

We present an assessment of the stability and dynamics of grain boundaries in graphene for different misorientation angles at finite temperature and up to extremely high temperatures, in particular, for a misorientation angle of 6.6, 14.1, 19.66, 27.8, 38.21 and 46.83. We report a high stability against annihilation up to extreme temperatures.
Optimization of BiFeO3MFIS Capacitors Doped Niobium by Using Taguchi Method
Authors: Lin K.C. , Ko C.H. , Twu M.J. , Juan P.C. , Sekiguchi H. , Chou C.H.
Published: December 2013

In this study,MFIS (Metal/Ferroelectric/Insulator/Semiconductor) capacitors whose structure is Al/BFO+Nb/HfO2/p-Si are investigatedby using Taguchi Method. The effects of leakage current, memory window, and signal-to-noise ratio (S/N ratio) are discussed by different process conditions. As a result, the leakage current and memory window indicate the better performance on th same process condition. The better conditions of this MFIS capacitoroccur in rapid thermal annealing (RTA) at 700°C, 5W direct current (DC) power of Nb sputtering and 15 of argon-to-oxygen ratio for laekage current and memory window.Oxygen vacancies were reduced bydoping niobium (Nb) that Nb ions replace ferrum (Fe) ions with RTA at 700°C. The more Nb dopesthe more Nb ions replace Fe ions. Butthe excessive Nb induces to increase the leakage current and reduce the memory widow.
Vacuum-Free Continuous Fabrication for Forming Narrow Bus Wires
Authors: Lee Ji Hoon , Choi Jin Ho , Lee Sang Ryong , Lee Choon Young , Park Cheol Woo , Kim Gyu Man , Kwak Moon Kyu
Published: December 2013

Photolithography is undoubtedly the most widely used patterning method for the fabrication of micro-and nanofeatures, despite the recent development in some unconventional fabrication techniques that are poised to take over certain applications. But photolithography is still the main fabrication method in industry. To step forward in many applied areas, however, large-area, continuous fabrication system needs to be developed. However photolithography has not been extended to large area continuous patterning like other printing technologies. Photolithography is currently based on wafer scale fabrication and metal deposition process is performed under high vacuum condition. Here we report the development of continuous roll type contact photolithography which is termed photo roll lithography (PRL) and vacuum-free metal filling method. Continuous patterning is achieved was by employing a flexible photomask with Al patterns, which was fabricated by conventional photolithography method. Also, metal nanopowder was stuffed in fabricated PR patterns by puffs, instead of conventional deposition methods. As a feasible application, we demonstrated a fabrication of narrow bus wire for using on display devices.
Compact Differential Dual-Frequency Antenna Based on Metamaterial
Authors: Han Li Ping , Hao Long Fei , Ma Run Bo , Zhang Wen Mei
Published: December 2013

In this paper, a compact differential dual-frequency antenna based on metamaterial is presented. To realize the dual-frequency operation of the left-handed and zeroth-order resonant modes, a ring slot and two diagonal slots are embedded in the radiating patch, and via holes are employed to connect the patch and the ground plane. In order to improve the impedance matching of the antenna, four corners are truncated in the ground plane. The proposed antenna has a compact size of 40 mm × 40 mm, which equals to 0.25 λ1 × 0.25 λ1 (λ1, the guided wavelength at f1). The simulated results show that the proposed antenna can operate at 0.89 and 1.79 GHz bands. Meanwhile, good radiation performances are achieved.
Analysis of Tunneling Phenomenon and Electron Confinement in Quantum Nanowire
Authors: Sonawane Ulhas S. , Samuel E.P. , Kasar Chetan , Patil D.S.
Published: December 2013

Using Transfer Matrix Method (TMM) the Eigen energy of the GaN/AlGaN quantum wire has been evaluated. Peak density results show the confinement and tunneling of electron distribution in quantum wire due to band offset of GaN (wire region) and AlGaN (barrier region). The impact of this band offset results in variation in Eigen energy and is significant in Tunneling phenomenon study to realize the transmission coefficient across the cross-section. Our analysis reveals that for wider wires transmission coefficient reaches to its peak for lower Eigen energy values. Likewise, increase in aluminum mole fraction in AlGaN decreases tunneling effect.
Effect of Three Arm Polystyrene on Polystyrene Film Stability
Authors: Sangjan Suntree
Published: December 2013

This research studied ways to increase the stability of a polymer thin film with a thickness of approximately 10 nm. Our system consisted of a polystyrene (PS) thin film filled with three arm polystyrene (TAP) as additives. Formation of dewetting was investigated by atomic force microscopy and optical microscopy which showed that complete dewetting of the pure PS film occurs after being annealed at 120 oC for 5 h. The dewetting dynamics were dramatically suppressed when a small amount of TAP polymer was added into the PS thin film. We hypothesize that the nitrogen atom in the TAP polymer provides dipolarity between the polymeric thin films and the substrate followed by an increase in the interfacial interaction of the TAP/PS thin films, which in turn leads to increased film stability. However, if the concentration of TAP is too high, this leads to phase separation of the thin films. We also observed that the amount of TAP within the PS thin film largely affected the efficiency of inhibiting dewetting. This method could be utilized for the study of the mechanism in a blended polymer film.
Analysis of Dynamic Characteristics of Structure Design of Bridge Crane in 65t
Authors: Yang Jing , Dong Yu De
Published: December 2013

Quayside container crane, referred to as the bridge crane. The steel structure is usually the permissible stress method is adopted to design check, analysis on its dynamic characteristics through the finite element analysis, can the actual working state simulation of crane more accurate. The dynamic characteristic analysis of problem, change to correct the parameters in the design, greatly improved the design efficiency and accuracy .
Study on Rayleigh Damping in Dynamic Analysis for Story-Adding RC Structure of Light-Weight Steel
Authors: Zhang Tao , Zuo Yong Zhi , Teng Hai Wen , Ma De Yun , Liu Huan
Published: December 2013

Damping ratio is a very important parameter for building structures in the analysis of dynamic response. Story-adding RC structure of light-weight steel is composed by two different material stories. If all the modal damping ratios are defined as the same, as to the dynamic analysis for that structure, the results of analysis will be inappropriate. This paper made some response spectrum analysis on a six-story story-adding RC structure of light-weight steel by finite element analysis software Midas Gen through defining the Rayleigh damping. In the meanwhile, compared the results based on different Rayleigh damping parameters with the results by using the method of strain energy proportional, and got the rule of the definition of Rayleigh damping.
Structural Modal Parameter Identification of the Bridge Subject to Environment Excitation
Authors: Chen Yan , Huang Can Ying , Zhu Shu Yun
Published: December 2013

Experiments were performed on Jundu Mountain Aqueduct Bridge, the article introduces the identification methods and processes which obtain modal parameter of bridge subject to Environment excitation. Layout of points effectively by moving the measurement method can obtain reliable measurement data, and it uses self-power spectrum、cross power spectrum and coherence function analysis , With the use of analytic technology for spectrum, has identified the preceding six natural frequency of the bridge vibration and has analyzed the phase information of he bridge vibration.
Magnetorheological Semi-Active Suspension System for a Tracked Vehicle
Authors: Peng Zhi Zhao , Zhang Jin Qiu , Zhang Lei , Huang Da Shan
Published: December 2013

A semi-active suspension system is researched for a heavy tracked vehicle to improve its suspension performance. This is achieved through a vane magnetorheological damper (VMRD) with special magnetic circuit which may attenuate the leak of MRF from assembly gap. A innovative strategy named frequency domain control (FDC) is proposed based on a conclusion that, in the frequency domain,the influence of damping coefficient to transmissibility for different suspension performance indicators is in good consistency. FDC only requires accelerometers mounted on sprung mass, meaning low price and high reliability that the tracked vehicle requires. The experiment indicates the designed semi-active suspension system based on VMRFD has an excellent vibration suppressing ability.
Vibration Characteristics Analysis of Wide-Chord Hollow Fan Blade
Authors: Guo Xiao , Yang Qing Zhen , Shi Yong Qiang
Published: December 2013

Wide-Chord Hollow Fan Blade is One of the New Technologies Used in Aircraft Engines. in this Paper, the Modal Analysis Method is Used to Analyze the Influence of the Rib Number and the Rib Thickness to Wide-Chord Hollow Fan Blade Vibration Characteristics. the Result Shows that the Wide-Chord Hollow Fan Blades Greatly Improves the First-Order Vibration Frequency Compared with the Solid Blades, and the First-Order Vibration Frequency of the Wide-Chord Hollow Fan Blades is Reduced with the Increasing Rib Number which is Not Good for Vibration Elimination. the Wide-Chord Hollow Fan Blades’ Vibration Frequency Changes a Little when the Rib Number is Larger than Three. in Addition, the Rib Thickness has Smaller Effect on Wide-Chord Hollow Fan Blade.
Dynamic Properties of Steel Fiber Concrete under the Action of Noncyclic Variable Amplitude Load
Authors: Lei Jin Sheng , Zeng You Wei , Peng Gang , Wang Qian Feng
Published: December 2013

Uniaxial dynamic compression tests were carried out on the triaxial testing machine to investigate the effect of noncyclic variable amplitude load. The characteristic of steel fiber concrete and differences among static uniaxial loading testing and dynamic uniaxial testing were studied systematically. It is shown that both the strain and the stress are directly proportional to the cycle frequency. Meanwhile, as the cycle amplitude increases, the irreversible plastic deformation increases gradually. And increasing the strain ranges, the stress strain curve becomes sparser. The comparison tests indicate that the peak stress relies on the loading modes. Under noncyclic variable amplitude load, the peak stress is higher than that of the static uniaxial load testing and the dynamic uniaxial testing, but the peak stress of the type corresponding to different frequency shows no evident difference.
The Characteristics of Geological Disasters Triggered by Wenchuan Ms8.0 Earthquake in Wudu District and Wenxian County of Gansu Province
Authors: Zhong Xiu Mei , Hou Peng Bo , Wang Qian , Wang Jun
Published: December 2013

The strong effect on ground damage and the serious earthquake-induced geological disasters are notable features of MS8.0 Wenchuan earthquake. This study obtained 993 earthquake geological disasters in Wudu District and Wenxian County of Gansu Province, by combining field investigation and interpretation of remote-sensing images. Then the characteristics of these geological disasters were investigated statistically using GIS techniques to determine how the occurrence of geological disasters correlated with intensity, distance from the rivers, slopes and elevations. The main results can be summarized as follows: (1) the geological disasters density increased with the increase of earthquake intensity; (2) the geological disasters triggered by earthquake show the feature of zonal distribution along the rivers; (3) the slope steepness is the main factor which controls the development of earthquake-induced geological disasters and most of the geological disasters are distributed with the slopes of 10 to 40 degree; (4) the earthquake-induced geological disasters have corresponding relationships with elevations, and most disasters occur with the elevation of 1000 to 2000 m.
Research and Analysis of a Suspension Bridge
Authors: Lei Cong , Li Pei Feng , Wang Qiao , Wan Shui
Published: December 2013

S Bridge is a suspension bridge constructed in 1996 (154m+452m+154m). This paper took the bridge as a background, and analyzed whether it could meet the technical requirements, thus providing a reference for the safe operation of the bridge. The results show that the bearing capacity of main girder, the sling stress and the safety factors of main cables meet code requirement, but the stress of stiffening girder concrete exceeds the code limits, meanwhile, the impact of temperature gradient load on stiffening girder is relatively large.
Design on Distributed Reconfigurable Satellite Full Life Cycle Value Assessment System
Authors: Han Xiu Li , Li Yong , Zhou Qing Rui , Wang Hui , Wu Guo Qaing , Zhang Shuo , Cao Rong Bo
Published: December 2013

In order to satisfy the application of space science, space-based remote sensing and environmental monitoring in our country, a value model is proposed for distributed reconfigurable satellite system life cycle value assessment in this paper. Besides, many uncertain factors of multi-aspects are considered in this model. The value model is transferred into value assessment tool by means of programming. In addition, the distributed reconfigurable satellite system developed by this tool and the corresponding value assessment system can be applied to space-based application system which is the current technology of the distributed reconfigure satellite system.
Coupled Fluid, Thermal and Structural Analysis of Nozzle in Solid Rocket Motor
Authors: Sun Lin , Bao Fu Ting , Shi Wei , Xu Hao
Published: December 2013

A coupled fluid, thermal and structure analysis model was established for solid rocket motor nozzle. Based on a steady flow simulation and a transient thermal simulation, a transient structure analysis simulation was executed. The model took a frictional coefficient 0.3 into account to simulate a rub action between the parts of the nozzle. Result showed that with a frictional coefficient, Von Mises stress could be released which gives a constructive recommendation for a structure simulation of a nozzle. Also, the model was more close to the actual. A more dependable approach was introduced and it could contribute to designing department.
The M-Band Symmetric Orthogonal Scaling Function in Higher Dimensions
Authors: Zhang Fang Jun
Published: December 2013

Wavelet theory has a key role in signal processing and image processing. In this paper, the characterization of the M-band symmetric orthogonal scaling function is obtained in higher dimensions. Then, a symmetric cardinal orthogonal scaling function is classified. The existing some results in one dimension are generalized to the case of higher dimensions.
Implicit Description of Structure Shape Based on KS Function
Authors: Zhou Ying , Zhang Wei Hong , Zhang Ding Hua
Published: December 2013

A complex structure can be constructed by Boolean operations of geometric primitives such as cube, sphere, cylinder, and so on. However, Boolean operations cannot represent the structure in form of mathematical function. In this paper, we propose a new shape representation method that combines the Boolean operations with the KS function. Applications show that 2D and 3D engineering parts can be described by a single implicit KS function.
Surf Crest Tracking Algorithm in Wave Image
Authors: Cui Hao , Wang Zhong Qiu , Liu Hui , Xu Yan
Published: December 2013

The non-contact ocean wave observation based on shore station could be impacted on high accuracy of surf crest 2D coordinate in wave images. Focus on previous disadvantages such as lower speed and accuracy, a novel surf crest tracking algorithm is represented with crest collapse function which could terminate the tracking process through end point adjustment. The algorithm could not only process the concerned part of the wave image automatically with higher speed, but also record 2D coordinate of every point on the concerned surf crest and the connection between every two contiguous points accurately, which are very practicable in the non-contact ocean wave observation.
A Model of Point Multiresolution Rendering Method
Authors: Qian Feng Chen , Shan Ning , Ye Ya Lin , Ma Yong Zhong , Hu Xue Yan
Published: December 2013

The paper proposed a data compression method in multiresolution structure and realized multiresolution rendering of point model by traversing the KD-tree breadth-first. It established the details control of multiresolution rendering, improved the drawing efficiency of point model. And a simulation study was carried out. Results show that the method could not only reduce the geometry data volume of point models directly, but also reduce the sampling point number without debasing the numerical precision of the model geometry data, so as to further reduce data volume of point model. In addition, the mixed rendering of geometric model point and rectangle in this method overcome the shortcoming that point model set is unsuitable for large flat surface.
Study on the Decoder for Reed-Solomon (255, 239) Code
Authors: Ge Yue Tao , Liu Xiao Ming , Yin Xiao Tong
Published: December 2013

Reed Solomon code is described as a theoretical decoder that corrected errors by finding the most popular message polynomial. The Verilog language is applied to descript decoding algorithm. Cyclone series FPGA EP1C6Q240C8 is adopted as a core of hardware platform and a serial port communication part is used to receive input error correction data. The results show that it can successfully correct eight errors, which is the limitation of error correction. With the RS decoder, it can ensure that the strong error correction capability and fast speed.
Study on Transportation Safety Management of Sodium Cyanide
Authors: Lin Hui Dan , Gao Geng Jun
Published: December 2013

As an important raw material of chemical industry, logistics and transportation quantity of sodium cyanide is sharply increased. However, the accidents of sodium cyanide ISO-tank transportation are frequently happened, which caused huge negative impacts on the society and the environment because of its high toxicity. In order to ensure smooth transportation of the hazardous chemicals, we must strive to control the dangerous sources of transportation to eliminate and reduce accidents for the safety and property of the people. On the basis of risk analysis of ISO-tank transport of sodium cyanide, this paper studies the reasons leading to accidents on the point of people, vehicles, ISO-tanks, roads and managements in detail. At last, it focuses on the countermeasures for safety management of sodium cyanide ISO-tank transport on the view of safety assessment in order to provide some guidance for the healthy and sustainable development of this industry. Key words: sodium cyanide;transportation; safety assessment
Research on Present Situation, Problems and Countermeasures of R&D in Shanghai Private Technology Enterprises
Authors: Yang Ping Xiao , Yang Hong Tao , Zuo Shu Wen
Published: December 2013

Under the circumstances of enterprises facing increasing competition, R&D is becoming the key to drive private technology enterprises to enhance the level of technological innovation and core competencies. This paper used questionnaire survey data from 155 shanghai private technology enterprises to describe their present situation of R&D and effectively analyzed the R&D problems. Finally, on the basis of the present situation and problems, the rationalizing countermeasures were proposed in order to provide some guidance and reference for the further development of shanghai private technology enterprises.
Pre-Warning Pattern for Safety Monitoring of Artificial Islands in Coastal Areas during Operating Period
Authors: Su Chun Mei , Sha Qiu , Mou Yong Chun , Jiao Zhi Bin
Published: December 2013

During operating period, the safety monitoring of artificial islands greatly relates to the stability of their enclosing structures and the safety of their production and operation. Combined with the development of the first safety monitoring automatic system for artificial islands in coastal areas in China, this article analyzes the characteristics of artificial islands safety monitoring during operating period. The relevant pre-warning indices and pattern are first put forward. The countermeasures for the engineering safety are hierarchically proposed so as to guide similar projects.
A Method to Evaluate Mixture Segregation Based on Space Grid of Image Processing Technology
Authors: Li Hong Chao , Yue Hong Ya , Ye Fei , Liu Jing
Published: December 2013

A space grid method, based on image processing technology, was proposed to evaluate asphalt mixture segregation, which used the ratio of statistical data variance and its square of mathematical expectation to describe material uniformity by statistics of distribution of particles on space grid. Computer procedure was developed and some experiments are made. The results indicate that this method is simple and can be used to evaluate asphalt mixture uniformity quantitatively with a good adaptability.
The Study of the Flexural Capacity of Old and New Prestressed Concrete Hollow Slab Strengthened with CFRP
Authors: Jia Bin , Fu Lei , Zhang Yu , Lu Yi
Published: December 2013

Prestressed hollow slab strengthened with CFRP is a new reinforcement method. To study the effect on reinforcement through different carbon fiber paste volume and paste manner, we did the experimental study on flexural capacity under the secondary load conditions with prestressed concrete hollow slab commonly used in engineering. Meanwhile, we also did the contrast analysis of reinforcement effect on the old and new prestressed concrete hollow slab. The results showed that prestressed concrete hollow slab strengthened with CFRP could effectively improve the flexural capacity of the specimen, besides the capacity increasing of the old and new prestressed hollow slab is a little difference, but both of the new and old can meet the engineering design specifications.
On Health Monitor Technology Development for Damaged Aircraft Structures
Authors: Liu Xiao Ming , Ge Yue Tao , Yin Xiao Tong
Published: December 2013

This paper seeks to outline the concept and application of health monitoring system in aircraft structure. The focus is placed on the principles and methods of the structural health monitoring system, including SMART layers, electric potential method, Acoustic Emission, etc. The difference between the above monitoring methods is justified and clarified. Finally a perspective view on structural health monitor techniques is discussed.
Structural Analysis and Shape Optimization with Finite Cell Method
Authors: Meng Liang , Zhang Wei Hong , Deng Zi Chen
Published: December 2013

A thick-walled cylinder under outer pressure load was studied by means of the Finite cell method (FCM). Sensitivity analysis was made to demonstrate the advantage of this method. Shape optimization of a turbine disk is conducted. It is shown that the introduction of B-spline basis function can achieve a high continuity of stress filed along the cell boundary.
Numerical Simulation of Liquefied Natural Gas in Rib-Tube
Authors: De Su Hou , Fu Zhang Yu , Che Ji Yong , Wen Xiao Long
Published: December 2013

The flow of liquefied natural gas (LNG) which was coupled between heat transfer and fluid-flow in rib-tube was studied in this paper. Based on theoretical analysis, the model and wall-function were chosen to simulate the flow field of rib-tube, and the multiphase flow was described by the mixture model, in which the dispersed phase was defined by different velocity. In addtion, self-defining functions were used and governing equations were set up to solve the dispersed phase, and the result were compared with the experiment. The process of fluid-flow and heat exchange on rib-tube was simulated, and the contours of temperature, pressure, velocity, gas fraction were obtained, which showed that, the parameters of above changed when the temperature was rising and the LNG evaporating along the rib-tube, and a mixed process existed in the middle of the heat tube.
Research on the V/H Inspection of Spiral Bevel Gear before Heat Treatment
Authors: Qiu Jia Lun , Zhao Rui Rong , Wang Ying Jie , Zhao Wei , Li Jing Cai
Published: December 2013

The V / H inspection method is analyzed, including its basic definition, purpose and V / H inspection technical process of Gleason Company. In order to improve the quality of the contact region, Gleasons V / H test method is conducted for V/H inspection of spiral bevel gear before heat treatment, and analysis of experimental data is given.
Dynamic Characteristics Analysis of Spiral Bevel Gearbox Used in Ship Lift Synchronization System
Authors: Lin Teng Jiao , He Ze Yin , Geng Fei Yu , Que Hong Jun
Published: December 2013

A dynamic finite element model of a coupled gear-rotor-bearing-housing gear system is developed by combining the gearbox transmission model with the housing structure model of spiral bevel gearbox used in ship lift synchronization system with taking stiffness excitation, error exaction and meshing impact exaction as the dynamic excitation. The intrinsic modes and vibration response are calculated, and then the modal frequency, mode shape, vibration displacement, velocity and acceleration of the gearbox are obtained to achieve the goal of prediction on vibration severity. In fact, the proposed approach not only provides a more comprehensive understanding of spiral bevel gearbox, but also can serve as the basis for vibration control of gear system used in ship lift synchronization system.
The Effects of Stack Parameters on the Performances of Acoustic-Refrigeration Thermoacoustic Conversion System
Authors: Li Xiao Hua , Li Chao , Cai Yi Xi
Published: December 2013

In this research, the acoustic-refrigeration thermoacoustic conversion system numerical model was constructed, the combined influences of structural and positional parameters of stack on the temperature difference at two ends (DT) and the coefficient of performance (COP) were analyzed. Besides, the acoustic-refrigeration thermoacoustic conversion test system was built up. Finally, experiments were performed to testify the calculation results of the conversion system. The results showed that within the common ranges of the parameters values, the porosity of stack affected the COP slightly while the temperature difference seriously, the temperature difference at the two ends of stack increased with the increase of the porosity of stack; for stacks which have the same porosity and gaps between each parallel plate, two values for the center position of stack were exist of which one could make the temperature difference get to the best value, the other one made the COP achieve the maximum value; when the porosity and the center position of stack remained constant, the temperature difference increased first and decreased afterwards with the increase of the gaps height between each parallel plate. In the selected model, the temperature difference at the ends of stack got an ideal value when 2y0=0.45 mm (the gaps height between each parallel plate was nearly about 2.4 times than thermal penetration depth). The results provided the theoretical basis and experimental evidences for improving the performance of acoustic-refrigeration thermoacoustic conversion system.
Analysis of Hydrodynamic Model of Wave Energy Converter of Inverse Pendulum
Authors: Cao Shou Qi , Fu Shu Man , Wu Zi Yue
Published: December 2013

The efficiency analysis of wave energy collection and conversion is crucial for utility of wave energy of inverse pendulum. In the paper, we build the hydrodynamic model of interaction between pendulum and wave in wave energy converter of inverse pendulum. On the basis of this typical model, we choose the actual wave condition of some sea area in the east of China as the background, research the hydrodynamic property of pendulum by numerical simulation with fluent software, get the relation curve of between the rotation angle of pendulum and moment of wave force with time, and acquire energy conversion model from wave energy to mechanical energy in wave energy converter of inverse pendulum. It makes the beneficial exploration for optimal design of wave energy converter of inverse pendulum.
Research on Power Flow Interface Oriented Regional Wind Power Forecasting Method
Authors: Yu Yun , Yang Bo , Ge Fu Jiang
Published: December 2013

Accurate regional wind power forecasting guarantees the security and economics of the power system integrated with large scale of wind power. Aiming at the gross wind power output of the whole regional grid area, existing regional wind power forecasting methods fails to characterize the locally gross output power of the wind farm aggregation forming a power flow interface with specified flow restraints. In this paper, the work flow of the power flow oriented regional wind power forecasting method based on whole-grid regional wind power forecasting methods was presented first. Then, the data preparation, data preprocessing and the mathematical description of the algorithm for our method were presented. Finally, the case study proved the feasibility and effectiveness of our method. The conclusion indicates that the method presented in this paper implements a multiple temporal and spatial scale regional win power forecasting technology, which can obviously improve the accuracy of regional wind power forecasting, relieve the pressure for the grid side and improve the utilization rate of wind power.
The Finite Element Analysis Concerning the Slip Coat of Workover Rig
Authors: Jin Jia Qi , Yuan Ye , Wang Xian Rong
Published: December 2013

Based on the finite element analysis of the slip coat in the compulsory lifting system of hyper-thermal snubbing operation injected by steam, the static analysis with regard to the slip coat is undoubtedly employed taking advantage of the finite element software. And then, the failure forms are deduced and the maximum allowable stress is calculated by analyzing the stress distribution.
Identifying the Unit Area Dynamic Characteristic Parameters of Fixed Joint Based on Equivalent Single DOF System
Authors: Xiao Yi Chuan , Wu Liang Sheng , Ma Jian Feng , Hong Hao
Published: December 2013

A whole machine tool structure is a muti-DOF system, it is usually composed of many parts which are connected with joint interfaces. The structure is complicated that the accuracy of modal test is always in a low level. When doing modal test, equivalent single DOF method can not only improve the efficiency and decrease the difficulty, but also exclude interferences such as random noise. In this paper, the author simplified a two-DOF system into an equivalent single DOF system and derived its frequency response function, then analyzed a testing device for fixed joint by using the equivalent single DOF method, and measured several groups of unit area dynamic characteristic parameters of fixed joint interfaces in different materials and different working conditions. The dynamic characteristic parameters can be used in further study of machine tool joint interfaces.
Research of Vibratory Feeder Activated by the Bimorph Vibrator
Authors: Su Jiang , Shen Yan Hu , Yang Zhi Gang
Published: December 2013

To meet the requirement of smooth convey for light, thin and small product in modern industrial area, a new type of vibratory feeder activated by the bimorph vibrator was proposed in this paper. The dynamic model of bimorph vibrator was established by analyzing the working principle. A prototype of the piezoelectric vibratory feeder was produced and tested. The relationship among voltage, amplitude, frequency and feeding speed was obtained from the experiments. The experimental results show that the proposed vibratory feeder had good performance at resonance. The amplitude and feeding rate increase linearly with voltage. The proposed vibratory feeder will have wide prospects in the automatic assembly line.
Mechanical Efficiency Analysis of Animal Locomotion by Specific Resistance
Authors: Park Sung Ho , Hong Dong Pyo
Published: December 2013

Living creatures can walk or run more elegant and advanced than any other legged mechanical models. Principles of existing robot systems are based more on technical rather than on biological concepts, yielding unstable locomotion with low speed. In order to apply advanced biological phenomena to the mechanical model, three types of vertebrates are selected, and their structures are modeled by 13 links and 12 joints, covering all existing leg and body arrangements, which is a rigid multi-body system and simulated to obtain optimal conditions by calculating locomotion efficiency, which satisfy the principle of minimum energy expenditure.
Multi-Channel Detection System for Joint Position Based on Optical and Orthogonal Decoding
Authors: Hu Qi Xiang
Published: December 2013

The multi-channel joint position detection system of measuring arm is of high precision, multi-channel and other special characteristic. This system uses hardware called DSPic30F microchip as the processing core. The detection system adopts optical encoder as joint angle sensor and orthogonal decoding and reversible chip HCTL-2032 to multi frequency the detected signal, which greatly reduces the system error and enhances the detection precision. Experiments of joint position detection are realized. Thirty times repeated experiments show that the maximum error is 0.009 °and the maximum relative deviation is 40.9 × 10-3 /%.
An Air Wipe Based Grease Removing and Saving Device for Anti-Twist Rope
Authors: Wu Xue Jing , Cui Wei Hua , Wang Hui , Lin Jing Sheng , Tang Lu
Published: December 2013

In order to guarantee work security and extend the life span of ropes, it is required that anti-twist ropes used in tensile stringing receive grease protection in time. However, the extra grease on the ropes should be recycled. Then, a grease removing and saving device was designed for such purposes by using an air wipe. It is believed that air wipe is better than other tools in grease removing because of its powerful function. To fully realize the grease removing function, we designed mechanisms to accurately position wire rope and prevent collisions between the rope and air wipe, calculated air consumption and supply pressure and designed a pneumatic control system. The device works well in practice, and the applications showed that the removing process was simple and the amount of the removal grease is easy to control.
The Decontaminating Device in Steel Wire Rope Automatic Cleaning, Detection and Maintenance Integration System
Authors: Chen Jun Jie , Wang Hui , Lin Jing Sheng , Fu Chao , Tang Lu
Published: December 2013

In order to improve the service life of wire rope used n tensile stringing, an automatic cleaning, detection and maintenance integration system was designed. Through the simulation analysis of elastic plates that fix the fixed brushes and the design of the rotating brushes driving system, a wire rope decontamination device assembled fixed brushes and rotating brushes was developed according to the demand of steel wire decontamination. The brush head adopts the design concept of elastic device, which makes the wire rope pressing force adjustable, ensures the wire connectors passable and makes the axial dirt sweeping of different diameter wire rope possible. The overall rotation mechanism with multiple brushes can circumferentially sweep the dirt in the wire rope gap. Then, the wire ropes were comprehensively sweeped with no dead cleanup. The device has been actually used, and the results showed that the decontamination effect is good.
Indentation Tests Based on Gelatin Phantom
Authors: Song Lei , Su Tong , Gao Li Ying , Zhang Qin He
Published: December 2013

In order to improve the accuracy of biopsy, an accurate FEM model is quite essential. To get the coefficients of the puncture target material which will be used in the Abaqus FEM analysis, the paper performed indentation test on gelatin phantom which is more stable than normal biological tissue. The Neo-Hookean and the improved Kelvin constitutive model were used to describe the mechanical properties of gelatin phantom demonstrated in the tests, including the hyperelastic and viscoelastic characteristics, then least squares method was used to fit the experimental data, finally the parameters of each constitutive model were achieved, which will be used to establish the material model in the further Abaqus FEM simulation.
Research on Signal Acquisition Based on Wireless Sensor for Foot Compressive Characteristics on Basketball Movement
Authors: Wang Jiu Hui , Ji Qiang
Published: December 2013

The signal acquisition system (SAS) operated by battery is designed in this paper. SAS includes signal acquisition and statistics function based on movement joints of basketball player. SAS is a recording of the electrical activity of the brain and pulse from the scalp and the recorded waveforms provide insights into the dynamic aspects of brain activity. The amplified SAS signals are digitized by an A/D converter. The digitized signal is transmitted to PC by a wireless serial port or stored in secure digital memory card. Experimental result shows that the system could implement the acquisition and storage of the foot compressive mechanical characteristics signals efficiently. This system would be of benefit to all involved in the use of SAS for sports training.
Study on the Comparison of Two Metrics Used in the Fields of Object Tracking
Authors: Xie Ying Hong , Wu Cheng Dong
Published: December 2013

The paper researches on the comparison of two metrics methods under Riemannian metric and under Log-Euclidean metric respectively. Firstly, Experiments are done for comparing the distance and mean values worked out under the two metrics. And the time required for computing under these two metrics is also shown. Lastly, the two methods are applied to the field of image tracking. The performance of the two methods is compared, and the time required for tracking each frame is gained. Experiments results show that the two methods can gain similar distance and mean values, and similar tracking results, while the time required under Log-Euclidean metric is less than under Riemannian metric.
Economic Analysis of Large-Scale Biogas Project Based on System Dynamics
Authors: Wang Li Li , Zhao Li Jun , Ma Li , Yang Guang Lin , Li Wen Zhe
Published: December 2013

With the application and promotion of large-scale biogas project, economic analysis and evaluation of large-scale biogas project are particularly important. However, the benefits of biogas project embodied in the economic, social, ecological, and many other aspects have dispersion, which leads to production decisions in a gray state and investment in conformity. In this paper, the biogas project in Zhuangda village, Zhaozhou County, Heilongjiang province is taken as an example, the supply and demand of funds in project operation are analyzed quantitatively by using system dynamics theory so as to study the economics of biogas project comprehensively, which can provide scientific guidance for evaluating the construction and operation of large and medium-scale biogas project objectively and lay a solid theoretical foundation for the commercial operation in biogas industry.
A Method of Optimal Module Partition in Green Product Configuration Design under Uncertainty
Authors: Liu Dian Ting , Hu Hao Ping
Published: December 2013

The principle and main steps of module partition in green product configuration design under uncertainty, and how to determine the correlation between the basic elements of a product, and how to calculate the green degree of module are discussed in this paper. Let the maximum degree of cluster inner a module and the minimum coupling degree among modules and the maximum green degree of modules as the objective function, the mathematic model of uncertainly optimizing for green module partition is set up. And then It is transformed to an ascertainable combinatorial optimization model by de-fuzzy operator, and it is solved by GA (Genetic Algorithm,). The methods of chromosome encoding and the methods of selection and crossover and mutation operator are presented in this paper. A computational example is studied; its result verifies the effectiveness and practical value of the method proposed in this paper.