bluuebunny/crossref_metadata_2025 huggingface dataset:
Parallel Random Walk for P/G Analysis
Authors: Guo Jun , Zhang Cang Song , Cui Jiao
Published: September 2013

This paper introduced parallel computing techniques to improve random walk algorithm. The random walk problem was firstly explained by a formal model. And then, the parallel features of random walk algorithm were discussed in detail. A parallel random walk algorithm was proposed and applied to analyze the VLSI power grid. The time complexity and the main factors impacting on the execution time of algorithm were analyzed carefully. The experimental results proved that the parallel computing techniques could improve random walk algorithm effectively.
The Research for the Energy Saving Effect of Permanent Magnetic Drive Technology in Pumping Systems
Authors: Sun Dong , Liu Hua Wei , Wang Xiao Dong , Li Wei , Li Zhen Lin
Published: September 2013

The purpose of this article is to analyze the energy savings of drive technology for permanent magnet in pumping systems applications. Studied the system structure and working principle of permanent magnetic actuator, according to the production parameters of pumping system collected before and after installation, drew the superimposed slip torque characteristic curve for the motor, analyzed the movement of rod load and the crank shaft, and to study the changes for rod power and active power of pumping system. did data comparison and analysis, showed that the magnet actuator improves the dynamic performance of pumping system, decrease the fluctuations of load and torque and reduced installed power of drag motor, theoretical analysis matched experimental results, confirmed the drive technology for permanent magnet in pumping system applications have a good energy saving effect.
Research of Low-Energy Routing on Single-Lamp Monitoring of Airfield Lighting
Authors: Wang Bing Yuan , Gao Jie , Gao Mei
Published: September 2013

A WSN (Wireless Sensor Network) routing protocol AL-CADE (Airfield Lighting-Clustering Algorithm based on Distance and Energy) based on logic zones was developed to monitor the airfield lighting in approach zone. In the protocol, the monitoring area was set several small logic zones according to the geography location of the nodes, and there were some advanced nodes placed in the logic zones as relay nodes. The cluster-head number of the nodes was optimized in the elliptical area, and the cluster-head election algorithm based on energy and distribution of the nodes was put forward. The simulation results show that the protocol is effective in reducing the node energy consumption and prolonging the network lifetime.
RFID Technology and Structure of Internet of Things
Authors: Tang Jia
Published: September 2013

The IOT( Internet of things) has been widespread concerned in recent years. In order to gain a better understanding of the IOT technology, the development of the IOT applications and one of the key technologies RFID technologies was given a detailed introduction. For the IOT operation principle and working mechanism can be more easily understood and grasped, it combined with EPC global standards, establishing a structural model of IOT, and giving the aware-layer, network-layer, and application-layer works in this model. To further promote the application of this IOT structure model, highlighting the problems to be solved, and emphasizing awareness node optimize allocation problem, information security issues and data processing problem, etc. The final conclusion points out some suggestions on the development of IOT.
Research and Construction of Information Security Simulation Test Bed for Electric Power System
Authors: Luan Hao Li , Zheng An Gang , Zhou Zhen Liu , Yang Zheng
Published: September 2013

Electric power system relies heavily on common information technologies and platforms, so all common information security issues have been experienced in the electric power information system. Because of attacks destructivity and uncontrollability, it is inappropriate to conduct security analysis in a real Power system directly. Therefore, the paper uses simulation and emulation technology to build a information security test bed for power system at a lower cost and no affect the normal operation and the premise of the aimed system. Simulation contents in the test bed are arranged in four different layers including firmware layer, system layer, network layer and application layer. The test bed also provides a network attack and defense combat system. The test bed can be used for Power system information and network system security testing, engineering validation and evaluation.
Research and Development of IOT-Convergent Social Media Application towards Experiential Agriculture
Authors: Gou Feng Yi , Li Bo Ran , Cao San Xing
Published: September 2013

When IOT of agriculture combined with the social media, by drawing support of social media, agricultural IOT could be promote from industrial application tosocial applications level, make full use of social media platforms for the information of agricultural crops and products got from Internet of Things, and spread the information to get the user's attention, thus a favorable mechanism for social media marketing would be built.
Research on the Combination of Entity Marketing and Network Marketing
Authors: Guo Xin
Published: September 2013

With the rapid development of Internet technology, traditional marketing has been faced new challenges and opportunities. There is a hot spot that how to modernize traditional marketing and online marketing optimization has been focused by enterprise at present. First, the entity marketing theory is analyzed in the paper. On its basis, then, the study collects the modern network marketing classic theory, to construct entity marketing and network marketing as a model by applying the idea of mathematical modeling. Based on multivariate linear regression analysis method, the advantage of the model in the practical marketing has been deepening. Finally, you can conclude that the integration of entity marketing and network marketing can better promote consumption and bring returns for enterprise. It can provide realistic basis to develop marketing strategies for the enterprises.
Computer Life Assessment and Equipment Identification Based on Fuzzy Evaluation Algorithm
Authors: Tang Fang
Published: September 2013

With the development of science and technology, especially the continuously upgrading computer technology , universities appeares large quantities of scrap phenomenon,because of the computer's poor performance. In the scrap computer process, the resources waste phenomenon is more and more serious. Poor performance is not equal to scrap that cant be used, reasonable allocation can realize the waste computer resources being reused. This paper mainly use fuzzy evaluation method to have a deep analysis and study on the reason of resources waste in the process of universities scrap computer, and puts forward some suggestions and measures.
Application on Campus Dormitory Management System Based on WiFi Technology
Authors: Yu Hai Cun
Published: September 2013

In recent years, with WiFi technology development, the manufacturing costs of related products continue to drop, personal computers with WiFi function and the popularization of other WiFi terminal were expanded. Especially in the higher education institutions, based on traditional cable connection network access, and because it has limited by access position and access condition, at present has been difficult to meet the teachers and students demand to high quality study, work, and the living conditions. On the contrary, the wireless network with its flexible and efficient ,free to move characteristics, favor by the of teachers and students, become the mainstream direction of the modern campus network construction, the application in campus dormitory management system on WiFi technology.It will be helpful to speed up our countrys sustained and rapid development in constructing educational informationization.
Banking Theory Based Distributed Resource Management and Scheduling for Hybrid Cloud Computing
Authors: Yun Feng , Li Hao , Lu Joan
Published: September 2013

Cloud computing is becoming more and more mature, and an IaaS could computing model called Cloud Bank [, which is based on commercial bank model, has been designed. Could Bank model can be partly distinguished from other traditional IaaS providers by the sources of infrastructure resources. This new model cloud offers new way to manage resource consumer, bank, and resource provider and maximize all participants benefits. Meanwhile, the new cloud bank model follows the way of commerce bank to against the risk during the transaction. This model may be new solutions for hybrid cloud computing management.
A Kind of Logarithmic Function Hardware Encryptor and Decryptor
Authors: Ruan Wei Hua , Hu Qing Sheng
Published: September 2013

This paper presents the realization of a kind of hardware encryptor and decryptor, which is based on Logarithmic Function principle. It shows how to design the encryption circuit and the decryption circuit by the sequential circuit. It had been designed in VHDL and simulated by Modelsim software, and then synthesized as well as realized on the FPGA chip EP2C5T144 by QuartusII software, last finished the test.
Research on Flow Field Characteristics of Whole-Quantity-Type Safety Valve
Authors: Zou S.H. , Zhang J. , Gao L. , Gao H. , Wang Ya Ping
Published: September 2013

Emulate and analyze the flow field of whole-quantity-type safety valve using CFX. Establish the test system of whole-quantity-type safety valve. Compare the simulation results and the experimental results. Verify the accuracy of the simulation results. Provide a theoretical basis for structural innovation and fault diagnosis of whole-quantity-type safety valve.
Nature Frequency Calculation of Revolving Parts Considering Stress Stiffening and Spin Softening
Authors: Wang Li Xin , Guo Ming Yue , Guo Yu
Published: September 2013

when the rolling part works in high speed, its nature frequency changes a lot due to stress stiffening and spin softening. Using a single rotor and a rotor with axis as an example, the first eight natural frequencies were obtained respectively through ANSYS after establishing models. Comparisons of nature frequencies of considering stress stiffening only, spin softening only, both stress stiffening and spin softening in a series of speeds were made. It was found that relatively large error would exist unless the effects of stress stiffening and spin softening were considered on nature frequency in high speeds.
Research on the Cutting Process Simulation Based on Finite Element Analysis
Authors: Zeng Kui
Published: September 2013

The blade is a complex mechanical structure model which has two processing methods. One is making mold blade using the electrochemical methods and forming the blade molding using precision casting methods. But the cycle of this processing method is long and the process is complex and difficult to control. The second method is cutting the blade directly. The cutting force and the friction between tools and blanks can affect the machining accuracy of the machining. We should timely adjust the cutting parameters and cooling model to improve processing accuracy.
Asynchronous Permanent Magnet Coupler Hydraulic Coupler and Performance Analysis
Authors: Liu Cai Jun , Ma Jie , Zhang Wu Jin
Published: September 2013

This paper analyzes the three major problems exist in the long-term use of hydraulic coupler, a temperature rise effect is the hidden trouble of the normal operation of equipment; two is the site difficult to accurately control the charging liquid, starting power balance and shutdown can not control the scraper conveyer; three is the property of medium effects factors of hydraulic coupling torque; introduces the working principle of asynchronous magnetic coupling and unique five technical characteristics. The asynchronous magnetic coupling and hydraulic coupler has obvious technical advantages compared, can solve the long-standing hydraulic coupler in the production practice expect to solve urgently and has failed to solve the problem. Conclusion is the soft starter for asynchronous magnetic coupling for scraper conveyor is completely feasible.
Study on Backup Method of High-Reliability ODU Power Supply
Authors: Sun Shang Сhuan
Published: September 2013

Currently, for ODU that is widely used in microwave communication system, failure caused by power supply accounts for a large proportion. This paper analyzes the composition and characteristics of ODU, and proposes an innovative ODU power supply backup method, and thus achieves the purpose of effectively improving the reliability of ODU.
Design and Implementation of Rolling Bearing’s Vibration Signals Transmission System in Oil Drilling Rig
Authors: He Wei Xing , Yin Chun Fang , Chen Xiao Ping
Published: September 2013

Based on the characteristics of rolling bearing vibration signals in oil drilling rig and the operation principles of oil drilling equipments, a signal transmission strategy combining wireless communication technology and signal line transmission is proposed. A reusing equipment of current loop bus time-sharing switching is innovatively designed. By adopting wireless time-sharing control and switching technology, the transmission of multi-road high-frequency vibration signals is completed by means of a high quality shielded coaxial cable. The fixture greatly simplifies the wiring connection mode and reduces the patch number. Thus, the equipment cost is lowered and higher reliability of system is achieved. The fixture realizes the real-time and efficient transmission of vibration signal of rolling bearing in oil drilling rig.
The Temperature Control Based on the AHU of Fuzzy-PID
Authors: Wang Xiang Dong , Wang Xin , Wei Jing Liang , Li Shu Jiang
Published: September 2013

Air conditioner unit which is a significant part of central air-conditioning is a multiinput-multioutput system.Because the input quantity of it is related with each other and influenced by multifarious interference, an ideal control effect is unavailable by general control method. It is also the main unit of energy consumption, so the refrigeration effect and the energy consumption of the central air-conditioning are determined by the control effect and efficiency of it. A neural network model is made according to the unit of air handing and controlled by the strategy of fuzzy-PID. It is proved by experiment that favorable control effect is available in case that the fuzzy-PID control strategy meets requirements when either there is interference or the target quantity changes.
Design for Wireless Environmental Monitoring System of Solar Photovoltaic Based on ARM
Authors: Li De Jun , Jin Hong Xiang , Wang Yang
Published: September 2013

The system uses ARM to control the running of stepper motors,so as to obtain generated output of its solar panel at varied angles of elevation and azimuth. It can obtain the solar irradiance data and monitor the temperature behind the solar panel and humidity of air at the same time by different sensors. At last, the real-time data will be transmitted to computers by the wireless communication module: CC2540, displayed by an upper-computer-monitor software called LabView. This system has been proved to be feasible in designing the scheme of Building Integrated Photovoltaic, after a long-term analysis for accumulated data.
Research on the Storage Management of Wireless Sensor Networks Based on Query Algorithm
Authors: Pan He , Li Tai Hao , Liu Zhi Gang
Published: September 2013

For the research of a query algorithm which is suitable for large-scale wireless sensor network should consider the energy consumption of nodes and the storage consumption of nodes. Through the simulation experiment of this algorithm can make the user adjust the merger rate according to the specific situation of network and the query, so as to ensure that the multiple queries in the processing are not affected by the limited cyber source.
Design of Satellite Emergency Communication Protocol Based on UDP
Authors: Kang Lei Lei , Xu Xiang Yang , Kang Chen Long
Published: September 2013

This paper mainly Study the satellite emergency communication characteristics of reliable data transfer protocol, combined with the UDP protocol and the TCP protocol of the advantages and disadvantages. The article puts forward an improved expanded with reissue of double reliable D-RCUDP protocol. This paper introduces the application background, the hierarchical structure, the core mechanism, application platform and experimental results.
Target Tracking with Two Passive Infrared Sensors Augmented with Irradiance Ratio
Authors: Hong Wei , Hu Ye
Published: September 2013

In target tracking using the passive infrared sensors, the principle of triangulation distance measurement is normally used as the basic method. However, when the target directions are nearly collinear relative to the baseline, this method merely based on EKF and angle measurements produces poor results. To solve this problem, we propose a target tracking solution based on dual infrared sensors in the cluttered environment. This method is a joint estimation algorithm of target motion state and atmospheric parameter such as the extinction coefficient. The method combines the probability data association algorithm with the augmented extended Kalman filter algorithm, into which we introduce the rate of infrared energy absorbed by the sensors at the ends of the baseline as additional measurement vector. Simulation results show that the proposed method performs better than the standard extended Kalman filter method, even in the case that the targets position is near the baseline in the cluttered environment.
Power Cable Fault Recognition Using the Improved PSO-SVM Algorithm
Authors: Wang Mei , Li Xiao Wei
Published: September 2013

Power cables are increasingly popular in daily life and industrial production. The long-term use will make various cable faults. To reduce the losses caused by the faults, the cable faults should be recognized correctly and timely. In this paper, we developed an improved particle swarm optimization and support vector machine (IPSO-SVM) algorithm to recognize the power cable faults. The algorithm used the improved PSO to optimize the SVM kernel function parameter and the penalty parameter simultaneously. Two advantages were illustrated by the simulation experiments. The first one is the recognition accuracy which was increased from 81.8% to 90.9%; the second advantage is the SVM training time which decreased from 0.0247 second to 0.0202 second.
Research on Application of Distributed Control System in Industrial Process Control
Authors: Hong Zhang , Zhang Shou Sheng , Sang Lu Ping
Published: September 2013

By combination with the general structure characteristics of the distributed control system and the technical specifications of CAN bus, this paper puts forward, designs a FDCS model control system for sewage treatment based on CAN bus and establishes mathematic model for dissolved oxygen (DO) and pH value in the oxidation ditch. It also designs two self-adaptive algorithms of the model and performs digital simulation of the control algorithms.
A Flammable Gas Monitoring Sensed System Based on Combining ZigBee and WiFi Solution
Authors: Feng Wen Jun , Zhu Xi’an
Published: September 2013

Currently monitoring of flammable gas mainly depends on some single function, low sensitivity or expensive detection devices. For this reason, a flammable gas monitoring sensed system based on combining ZigBee technique and WiFi technique solution is introduced in this paper. In the system design CC2530 is used as the master centre processing unit and the star topology is put into use to complete the data collection and transmission solution. By choosing the convenient WiFi chip, the data can be uploaded via WiFi protocol, and used for data statistics or security monitoring or other purposes. The experience shows that the system performance is stable and reliable.
Sliding Mode Control of Anti-Lock Braking System
Authors: Zheng Lin , Shi Zhan Qun , Gu Xue Ming , Ball Andrew
Published: September 2013

Many different control methods for Anti-lock Braking System (ABS) have been developed. In this paper, a new control algorithm is proposed for ABS based on sliding mode control algorithm, which represents the nonlinear characteristics of external interferences. The proposed sliding mode controller guarantees a highly robust performance against large variations in the system parameters and disturbances. Simulation results show that the proposed method has advantages compared with conventional linear controllers.
Study on Vacuum Control System of Large Laser Facility in ICF
Authors: Wang Li Quan , Xu Bing , Feng Bing
Published: September 2013

In large and high power laser facility, Vacuum system is an important subsystem of laser facility. It provides reliable, stable and clean vacuum environment for physical experiments. Because of its huge scale, vacuum system stands on a spread and broad district. The vacuum system is composed of some independent subsystems, and every subsystem is composed of PLC control system. So, distribution network control mode is just adopted for the vacuum control system. Each sub PLC system and main PLC system compose large laser facility vacuum control system. Main control system uses monitor computer to control each subsystem and communicates with upper control system through Ethernet. Field equipments drive the vacuum preparation equipments by switch or data format. Through main PLC, field control PLC and equipments obtain, it can gather accurate vacuum gauge pressure data and control all vacuum pumps and valves no mistake.
Applied Research of Wireless Communications in Industrial Process Control
Authors: Ma Bing , Hao Li Jun , Zhang Zhe
Published: September 2013

Wireless communication technology has become another research focus in the field of industrial control. It, which is a revolutionary technology that can increase the scope of application of industrial measurement and control system, can be used not only as a supplement to the wired network, but also as a independent network. This article focuses on the wireless network communication protocol commonly used in modern industrial control, and highlights the wireless communication protocol ZigBee based on IEEE 802.15.4 and its characteristics. From the low-power, low-cost point of view the overall design of embedded wireless communication system which is based on ZigBee technology in industrial control are proposed, meanwhile it put forward the basic framework of wireless network nodes ZigBee, and the options of industrial site networking mode.
Study on Automatic Sorting and Counting Machine for Coin
Authors: Pan Li Ai , Du Qiu Lei
Published: September 2013

RMB contains a large number of coins in circulation in the financial and other fields, this coin inventory and classification, is through manual means, this mode of operation and low work efficiency and give the operator a great trouble, the labor intensity greatly, and not accurate. In the paper, an automatic sorting and measuring machine has been designed and mainly used for sorting, counting, packaging to a variety of coin. The main function of automatic sorting and measuring machine are automatic sorting, counting and packaging. The machine mainly consists of mechanical systems and control systems. It is applied to the modern innovative design and it is the device meeting the need in places for many small denominations of currency. The machine has achieved automation, improved labor productivity, and also brought many conveniences to life. The machine is the inevitable trend of future development.
Hypersonic Cruise Vehicle Attitude Control Based on NESO
Authors: Lian Cheng Bin , Bai Chen , Ren Zhang , Shao Xing Yue
Published: September 2013

Hypersonic cruise vehicles traverse abroad flight envelope, severe interference and aerodynamic parameters of great uncertainty. Aiming at these problems, the attitude control system is divided into two first-order subsystem based on the backstepping, which improved by introducing the command filter and the error signal correction. simplifies the solution of pseudo control of derivative, and considering the attenuation and noise on the system state. The aerodynamic parameters wide variation range and disturbances were classified into two subsystems uncertainties, and two sets of nonlinear extended state observer (NESO) were used to estimate them. The backstepping controller based on NESO was designed with combined estimated value and backstepping method. Additionally used fuzzy logic to tuning the NESO parameters. Simulation results show that the method can track the control signal accurately, and has good robustness against parameter uncertainty.
Design of Executing ELF Files for Multi-Process Micro-Kernel Embedded OS on ARM
Authors: Yang Wei Ming
Published: September 2013

This paper describes the design and implementation of executing ELF files for ARM-based multi-process micro-kernel embedded operating system, including overview of ELF files, key techniques of executing ELF files, such as installing command-line parameters and environment variables, loading ELF file, setting related registers and PCB fields, and starting the executable ELF file, etc. Based on the functionality of executing ELF files described in this paper, the corresponding shell interpreter and shell commands can be designed and executed. At the final, the paper provides some demo examples of shell commands to show the effect.
Design of Piping Functionality for Multi-Process Micro-Kernel Embedded OS on ARM
Authors: Qu Bo
Published: September 2013

This paper describes the design and implementation of piping functionality for multi-process micro-kernel embedded operating system on ARM, including overview of message passing and piping, pipe creation, pipe accessing via message passing, and pipe termination. The ways to implement piping for micro-kernel or mono-kernel are markedly different and this paper focuses on the piping implementation for multi-process micro-kernel. At the final, the paper provides a demo example to show the effect of piping. Based on the piping functionality described in this paper, more powerful shell interpreter with piping function can be designed.
Design of Raw Socket for Multi-Process Micro-Kernel Embedded OS on ARM
Authors: Qu Bo
Published: September 2013

This paper describes the design and implementation of raw socket for multi-process micro-kernel embedded operating system on ARM, including overview of network socket, key techniques of implementing raw socket, such as socket creation, socket accessing via message passing, and socket closing, etc. At the final, the paper provides a shell command named ping as an example to show the effect, which uses the raw socket to implement the functionalities of sending echo requirement and receiving echo reply of ICMP. Based on the foundation described in this paper, datagram socket and stream socket can be implemented further.
Research of Numerical Simulation for Multi-Core Photonic Crystal Fiber Couplers
Authors: Cao Bao Yin , Liu Yong , Yang Ling
Published: September 2013

In this paper, multi-core photonic crystal fiber couplers are characterized and numerically simulated with Mangan et als theory and beam propagation method. We propose a kind of 1×3 multi-core photonic crystal fiber couplers with broadband characteristics and the identical split ratio within the range from 1300nm to 1800nm. If the proper length of the couplers is chosen, light couple intensity is completely the same by periphery there-core fiber with broadband characteristics. It provides a theoretical basis for the practice of multi-core photonic crystal fiber couplers.
Research on Memristor Oriented to Resistive RAM
Authors: Huang Da , Tang Yu Hua
Published: September 2013

With the process of high integration, low power consumption, small size in the semiconductor industry, resistive RAM has drawn increasing attention. The discovery of the memristor brings much more to this study. These researches focus on resistive switching characteristics of different materials and analysis of resistive switching mechanisms. We discuss the resistive switching mechanisms of different materials in this paper and analyze different materials used in resistive RAM. Finally, simulation of memristor Spice model oriented to resistive RAM has been finished
Design and Compression Deformation Analysis of an Innovational Structure with Auxetic Effect
Authors: Ge Zhao Yang , Hu Hong
Published: September 2013

An innovational structure with auxetic effect was designed from inspiration of a re-entrant honeycomb structure firstly proposed by Gibson et.al. In the newly designed structure, yarns were used to replace the straight and tilted ribs of re-entrant honeycomb structure in order to achieve negative Poissons ratio. The compression testing was carried out in the vertical direction of the structure using an INSTRON 5566 tester to understand its deformation behavior. The results show that the difference in bending stiffness between the warp and weft yarns is the main reason for getting negative Poissons ratio of the structure.
Dynamic Simulation of Gun Carrying Electronic Devices
Authors: Li Dong Wei , Ren Guo Quan , Yang Zhao Shu , Li Ben
Published: September 2013

In order to study the reliability of the gun contained electronic equipment, take the fire control computer as an example,establish its physical model and then based on the modal analysis theory, dynamics simulation analysis for fire control computer is done by ANSYS. For vibration and shock which cause by the gun firing is harm to the equipment and the measures for vibration resistance is put forward. Through the contrast of the natural frequency of vibration isolated before and after finding that oscillator can effectively reduce the system nature frequency, and this could make the response amplitude is less than the excitation amplitude based on vibration isolator transmissibility curves. It could provide good conditions to ensure the box and its internal printed circuit board to meet the multiplier rule.
Vibration Tests for Determination of Longitudinal Elasticity Modulus and Shear Modulus of some Structures Welded with Tubular Wire
Authors: Moisa Raul , Medgyesi Tiberiu , Bereteu Liviu , Drăgănescu Gheorghe , Simoiu Dorin , Sava Marcela
Published: September 2013

The purpose of this paper is to determine Young's modulus and the shear modulus of some welded joints made with usual tubular steel by flexural vibration tests. This is the case of the type carbon steel plates S235 JR according to EN 10025, with a thickness of 3 mm welded with MIG/MAG welding process with R713 tubular wire with a diameter of 1.2 mm, using SelcoNeoMig 3500 equipment. The technological part is detailed: welding parameters used, advantages and disadvantages of tubular wires use, problems regarding ambient protection, punctual applications of welding procedures with tubular wire. Processing the obtained signal based on vibration response the elasticity modulus is determined and its value is then compared with the value of elasticity modulus obtained through tensile stress and also with the value obtained by theoretical way.
Modeling and Testing of a New Dynamic Balancing System Based on Magnetic Interaction
Authors: Ilie Cristinel , Comeaga Daniel Constantin , Donţu Octavian G.
Published: September 2013

In this article is presented a dynamic mathematical model for a new type of dynamic balancing system, having a driving solution of the rotating part based on magnetic interactions. Experimental studies for evaluation of the dynamic stiffness and damping due to the magnetic coupling were performed by measuring the radial mobility of the whole system. The experimental studies were used to improve the analytical model.
Vibrations Modeling and Simulation Using Stochastic Bondsim Elements
Authors: Zlatkovic Bojana M. , Samardzic Biljana
Published: September 2013

The application of Bondsim library for the stochastic vibrations modelling andsimulation is given in this paper. For that purpose the stochastic Bondsim elementsare used. The efficiency of the proposed approach for modeling and simulation ofstochastic dynamic systems vibrations is illustrated using an example ofhydraulic ram pump.
Acoustic Zoning and Noise Assessment
Authors: Praščevič Momir , Mihajlov Darko , Cvetkovic Dragan , Gajicki Aleksandar , Holecek Nikola
Published: September 2013

The great majority of cities in the world have resolved problem of acoustic zoning in the urban part of the city. Two approaches are usually applied in acoustic zoning: acoustic zoning of the territory in accordance with land-use where the allowed values of noise indicator are defined and acoustic zoning by preparing noise maps around dominant sources of noise in urban areas and defining land-use in relation to calculated isofonic lines. As international standard and internationally recognized methodology for preparation of acoustic zoning does not exist, the authors of this paper initiated preparation of methodology for acoustic zoning. The concept of methodology is demonstrated in this paperwork. The methodology has been applied on the City of Nis example starting from the specificity of Nis urban area as well as requests and goals that have been set and defined during sustainable planning of Nis City development. Based on defined acoustic zones and noise measurement results for five years period on the territory of Nis City, the evaluation of the condition of noise level has been done and this paperwork presents results obtained.
Some Effects of Rubberized Asphalt on Decreasing the Phonic Pollution
Authors: Herisanu Nicolae , Bacria Vasile
Published: September 2013

An important contribution to the noise generated by the road transportation means in the environment has the noise produced by the tire-road contact. This paper is concerned with the investigation of the noise produced by the contact between the tire and the rolling surface covered by rubberized asphalt. Initial test performed in the past were performed again in identical conditions in order to assess the durability and absorbent properties of the rubberized asphalt over time in the climate specific to Timisoara. It was found that the rubberized asphalt has not changed its acoustical properties over time, since practically the same values were obtained for the equivalent noise level as well as for the spectral distribution of the noise, which confirm the efficiency of rubberized asphalt to decreasing phonic pollution in urban areas.
Analysis of the Sound Power Level Emitted by Portable Electric Generators (Outdoor Powered Equipment) Depending on Location and Measuring Surface
Authors: Postelnicu Elena , Vladut Valentin , Sorica Cristian , Cardei Petru , Grigore Ion
Published: September 2013

Acoustic power is a measure which must be specified on the outdoor used equipments and its determination depends on several factors: the place where the equipment works (indoor or outdoor), the placement of the microphones for its determination (the distance less or greater from the noise source), the shape of the measurement surface (parallelepiped or hemispherical). This paper aims to analyze the values obtained in these situations and interpret the data to determine the influence that each factor has on the acoustic power compared with the values obtained (permissible) according to Directive regarding noise emission D 2000/14/EC.
Model for Forecasting the Exposure Risk of Workers to Hand-Arm Occupational Vibrations
Authors: Vasilescu Gabriel Dragos , Ghicioi Emilian , Simion Sorin , Pasculescu Vlad
Published: September 2013

This paper work presents the model for forecasting the exposure risk of workers to hand-arm occupational vibrations, which has been achieved in the PN 07 45 01 18 Project from within the framework of the NUCLEU/2012-2013 Program.This project is of national and European interest, in order to increase occupational health and safety level and to ensure sustainable environmental quality and comfort at work.
Experimental Research and Modeling of the Underwater Sound in Marine Environment
Authors: Arsene Delicia , Borda Claudia , Butu Larisa , Marinescu Marinela , Popovici Victor , Arsene Mihai
Published: September 2013

The paper presents a modeling of the acoustic field emitted by a rig tender located offshore exploration in the Black Sea. Are presented measuring system, experimental context, the types of noise that participate in the overall noise budget and the conditions in which measurements were made, also are mentioned and the project established through were measured the parameters and were defined devices which these measurements were made. Measurement system used is adaptable, allowing dynamic measurements and operative analysis of the acquired data. Measurement methodology was determined by an acoustic project, which was set to be purchased both: sizes and ways of interpreting them. Modeling acoustic field shows that the maximum acoustic impact area, below 120 dB re 1μPa criterion (proposed and accepted by Marine Directive) was extended to 3-5Km distance around the ship. It is expected to produce adverse effects on the marine habitat and on the underwater life.
Analysis of the Dynamic Behavior of the Antiseismic Elastomeric Isolators Based on the Evaluation of the Internal Dissipated Energy
Authors: Alexandru Carmen
Published: September 2013

The method of testing the elastomeric isolators at shearing, in a system formed of two elements in parallel, is presented. The exterior actions can be represented by harmonic functions defined as:kinematic excitation through the instantaneous displacement of the form (t)=Asinωt;dynamic excitation through the instantaneous force of the form F(t)=F0sintωt or P(t)=m0rω2sintωt.The linear viscoelastic behavior of the elastomer enables the obtainment of hysteresis curves of elliptical shape for each harmonic loading.In the end, the dynamic stiffness as well as the equivalent damping can be evaluated, with the mention that the stand testing individualizes the dynamic system only through viscous, elastic and inertial forces. Due to this reason, the 1storder differential equation eliminates the definition of the critical damping ratio as for a second order system, which leads to the introduction of the concept of equivalent damping, originating in the hysteretic damping or the loss factor.
Calibration of the Ground Motion Model Using a Simplified Stochastic Model in the Case of the Central Exhibition Pavilion ROMEXPO
Authors: Murzea Patricia-Florina
Published: September 2013

The aim of the paper is to present the results of applying the formulae of a simplified stochastic model for the calibration of some macroscopic parameters of the ground motion, on the basis of rather rough estimates. For this purpose the basic records combinations results obtained with the aid of computer programs (DaisyLab and LABView) are used, after digital recordings on the large span and rather isolated structure of the ROMEXPO Pavilion in Bucharest were performed. A stochastic model of stationary, low intensity, ground motion (referred to in literature as microtremors or ambient vibrations) was proposed by H. Sandi (1982, 2005). This lay at the basis of the specification of input for a consistent analysis of 3D earthquake induced motion of structures, adopted in the Romanian earthquake resistant design codes.
Multiple Fault Identification Using Vibration Signal Analysis and Artificial Intelligence Methods
Authors: Zuber Ninoslav , Cvetkovic Dragan , Bajrić Rusmir
Published: September 2013

Paper addresses the implementation of feature based artificial neural networks and self-organized feature maps with the vibration analysis for the purpose of automated faults identification in rotating machinery. Unlike most of the research in this field, where a single type of fault has been treated, the research conducted in this paper deals with rotating machines with multiple faults. Combination of different roller elements bearing faults and different gearbox faults is analyzed. Experimental work has been conducted on a specially designed test rig. Frequency and time domain vibration features are used as inputs to fault classifiers. A complete set of proposed vibration features are used as inputs for self-organized feature maps and based on the results they are used as inputs for supervised artificial neural networks. The achieved results show that proposed set of vibration features enables reliable identification of developing bearing and gear faults in geared power transmission systems.
Study of the New Solitory Wave Solutions and Periodic Wave Solutions of a Two-Dimensional Modified KdV Equation
Authors: Gu Mei Ling , Zhu Zhi Hua , Ma Song Hua
Published: September 2013

With the help of the Riccati mapping approach and the variable separation method, some new solitory wave solutions and periodic wave solutions of the two-dimensional modified KdV(MKdV) equation are derived.
Hydraulic Fluid Mathematical Modeling
Authors: Shi Pei Cheng , Sun Yang Min
Published: September 2013

In hydraulic system, the property of hydraulic fluid will have non-linear behavior change when the temperature and pressure of fluid and the amount of dissolved and undissolved air vary, thus influencing the hydraulic system performance. The authors first studied the property of hydraulic fluid, and then constructed the mathematical expression theoretically, which shows the hydraulic fluid effective density using the fluid pressure, temperature and air content parameters. The computation simulations of the hydraulic fluid non-linear property were carried out using the simulation program based on MATLAB software. Meanwhile the key-factors affecting the hydraulic effective density and fluid bulk modulus were discussed. The study results provide computing foundation for designing quickly responsive, running steady and highly accurate hydraulic transmission system, which have important theory and engineering significance.
Analytical Characterization of the Performance of Steel Heavy Clip Angle Connections
Authors: Joe Yang Hee , Kim Jae Wan , Hu Jong Wan , Seo Jun Won
Published: September 2013

Based on some of experimental results for components and full-scale connections, this paper investigates the strength, stiffness and ductility behavior of heavy clip angle connection components subjected to static loading. The results of tests on heavy clip angle connection (t=25mm) are described first, and then a methodology to generate the response of the clip angle connection using nonlinear finite element models (FE) is presented. Extensive experience with 3D numerous models is discussed, including the effect of boundary conditions, introduction of the pretension force into the bolts, and effects of small changes in geometry on the deformation capacity of the angles. Possible strategies for the extension of this modeling approach to cyclic loads are also described.
Design Check for the Steel Gusset Plate in Tension Using LRFD Method
Authors: Hu Jong Wan , Jang Hee Myung
Published: September 2013

This study is mainly intended to examine gusset plate described on the basis of the load resistance factored design (LRFD) method. The determination of design based on the full plastic strength of gusset plate in accordance with the current AASHTO Specifications. The I-40 bridge gusset plates considered herein were designed in accordance with the previous allowable stress design (ASD) method. Therefore, new design methodology will be applied to this gusset plate bridge in this study suggested by new LRFD method. The design strength models to evaluate resistance strength against available failure modes such as tension yielding and block shear rupture are presented. In addition, detailed equations are described with step-by-step procedures. Finally, the rating factor between resistance strength and applied loading, which indicates life safety, will be presented according to available failure modes.
Thermoelastic Damping and Thermal Relaxation Time in Auxetics
Authors: Maruszewski Bogdan T. , Drzewiecki Andrzej , Starosta Roman
Published: September 2013

The paper concerns description of the thermoelastic phenomenon in an auxetic rectangular plate within the extended thermodynamical model. Analyzing vibrations of that plate a dependence of elastic constants on the frequency, particularly of Poissons ratio of auxetic state of the body has been presented. Moreover, considered investigations allow to determine the thermal relaxation time analyzing resonance frequencies of the vibrating plate.
Investigation of (G'/G)-Expansion Method and Exact Solutions for the (2+1)-Dimensional Calogero-Bogoyavlenskii-Schiff System
Authors: Xu Gen Hai , Ma Song Hua , Fang Jian Ping
Published: September 2013

With the help of the symbolic computation system Maple and the (G'/G)-expansion method and a linear variable separation method, a new family of exact solutions (including solitary wave solutions,periodic wave solutions and rational function solutions) of the (2+1)-dimensional Calogero-Bogoyavlenskii-Schiff system (2DCBS) is derived.
Controlling the Chemical Composition of the Interface Thermally Grown Oxides to Prolong the Lifespan of Thermal Barrier Coatings Based on Interfering Aluminum Diffusion Mechanism
Authors: Han Yu Jun , Ye Fu Xing
Published: September 2013

This study places great emphasis on the relationship between the TGO chemical composition and the TGO growth rate and the mechanical property of thermal barrier coatings upon isothermal oxidation. The results indicate that the control of the θ-Al2O3α-Al2O3 phase transformation can have significant effects on the subsequent isothermal oxidation during the earlier stage of isothermal oxidation. The formation of (Al, Cr)2O3 oxide sub-layer originated from the textured and larger grain of α-Al2O3 can influence the potential TBCs lifetime. Additionally, the potential longer oxidation lifetime of TBCs that subjected to the appropriate vacuum heat pre-treatment can be attributed to the larger absorptive energy of the TGO area prior to its fully microcrack imperfection propagation. Most importantly, TBCs delamination was determined by the steady-state energy release rate in ceramic topcoat and TGO, the TGO and the interface, as well as the formation and development of the microstructure and composition of imperfections in the vicinity of the interface.
The Simulation Research of Damping Characteristics for the Underwater Vehicle Moving under or Exceeding Water
Authors: Zhang Chun Fang , Gao Jing Bo , Lü Hai Bo , Zhao Zhen Jun , Wang Cong
Published: September 2013

The vehicle may vibrate when it moves under or exceeding water. This vibration will interact with the flow filed around to form a fluid-structure interactiondynamics system. In this paper, the numerical simulation of a cylinder in the process of moving under or exceeding water with ABAQUS and FLUENT is presented. Simultaneously, the first three damping ratio of the system are obtained by damping identification. For different density, viscosity and velocity of water, model separately to get the impact of each factor. Besides, the continuous process of exceeding water has been discretized to obtaindifferent oscillating curvesat different positions with respect to the water,and then the change of the damping ratio is presented. Thus the damping characteristics of the system in the water-exit process have been obtained approximately.
A Theoretic Analysis Method Research of Load Appling Based on Response Control in Time Domain
Authors: Hu Jie
Published: September 2013

With the discretely analysis of Borel theorem and Duhamel integral, a new theoretic analysis method of load appling with the purpose of time domian response control is proposed. Result of numerical simulation indicated the validity of this new method, the research of this paper provided an effective way of time domain load applying in examing the product performance.