bluuebunny/crossref_metadata_2025 huggingface dataset:
An Principle and Technology of On-Machine Measurement for Large Gear Hopping
Authors: Jin Jia Qi , Jiang Xing Yu , Li Feng Hui , Li Hui
Published: June 2010

For large gear with the characteristic of large structure, quality and modulus, its profile precision is usually measured by in-site measurement. Based on large gear on-machine measuring described, involute helicoid and its characteristic are studied. The definition of medium rack in the framework of gear meshing transmission is put forward, the scheme of on-machine measurement based on rack-shaped-edge probe is formed, which can be divided into rolled angle (phase angle) and pressure angle (meshing angle) measurement according to the rotation of gear and prob. Measurement grid is determined by measuring straight generatrix deviation of gear profile, furthermore total tooth profile deviation and total helix deviation are separated.
Influence Factors Analysis of Hammer Head and Screen Plate Life of CFB Coal Crusher
Authors: Lv Hai Ou
Published: June 2010

In this paper, the wear mechanism of harmer head and plate of coal crusher of circulating fluidized boiler(CFB) is researched. In order to extend the life of the hammer head and screen plate, some new design is advanced on material and structures. A practical instance shows that these new design can extend the life of the hammer head and screen plate and improve the working efficiency of coal crusher. Also these can reduce the lingering time of the big hard coal lump in the crusher, reform and optimize the grade ratio of the crushed coal lump. In addition these researches are meaningful for energy saving.
Transient Process Response Analysis of Forced Synchronous Elliptical Vibrating Screen
Authors: Zhang Lian Wan , Yin Zhong Jun , Sun Xin , Tang Zhi Chao
Published: June 2010

This paper is based on the scientific modeling of large-scale elliptical vibrating screen which is widely used in many fields. Through the tool of harmonic analysis in ANSYS, the dynamic stress responses during steady state and transient process are studied. The results confirmed that the existing structure can fulfill the requirement of dynamic stress level. Another contribution of this paper is to provide a new idea to analyze the transient process response, especially when the motor data are not sure.
Determination and Prediction of Bubble Point Pressure for CO2-Oil System
Authors: Hao Yong Mao
Published: June 2010

Through experiments and model simulation, this paper had a comprehensive study on the determination and prediction of the bubble point pressure(BPP) for the CO2-oil system. The result indicates that The reservoir fluid and CO2 can normally reach the one-contact miscible state above the CO2 concentration of 60 mol%. For different oil samples of a certain reservoir, the curves of the relative BPP can be regressed to get a single curve. These curves can be used to estimate the BPP of any unknown oil-CO2 mixture in the reservoir. The calculation result of the advanced PREOS is accord with the experiment result, which is better model simulation.
State of Art Techniques in En-Route Caching
Authors: Wang Bo , Yun Jian
Published: June 2010

The World Wide Web has been considered as a large distributed information system based development and use of computer technology that both provide access to shared data objects. En-Cache techniques are important for reducing Internet access latency, network traffic, and server load in different networks. In this paper, we survey the state-of-art techniques used in En-route Caching and discuss the recent development.
A New Method for Stochastic Mathematical Programs with Equilibrium Constraints
Authors: Zhao Wen Ling , Ge Shu Qin , Zhou Jin Chuan
Published: June 2010

In this paper, We consider nonlinear optimization problem with equilibrium constraints where the constrained conditions with uncertain. We transform the original constrained into the equality constrained.
GPU-Based 3D Cellular Surface Texture Relighting
Authors: Jin Lei , Dong Jun Yu , Ji Ping
Published: June 2010

Procedural texturing is a powerful way to add details to the surface of rendered objects. The Worley basis function of Cellular Texture is the most popular one and widely used to create various kinds of solid textures. However, most applications are implemented over 2D textures, which do not present varied illumination and viewpoint information. We present a method for creating surface height maps based on cellular textures and relighting them on 3D scenes. Furthermore, we implement our algorithm on GPU and show real-time relighting performance under arbitrary lighting directions.
Design and Implementation of the Automatic Search and Price-Comparison System Based on the Deep Web
Authors: Lin Pei Guang , Zhou Su Ying , Zhao Lin
Published: June 2010

With the development of the Internet, the online shopping was increasingly into people's life. In order to provide convenient search and price comparison service for shopping online, this article designs and implements automatic search and comparison system based on Deep web. To overcome the difficulties of data capture from the current dynamic webpage, the background’s data capture of this system implements by watir. The search module for end-users implements by JavaEE. The practical application shows that this system can fully satisfy people’s needs in search and comparison.
Edge Based Level Set with Gaussian Filtering Regularized and its Application in Liver Segmentation
Authors: Feng Rui Jie , Jiang Hui Yan
Published: June 2010

A novel edge-based active contour model (ACM) is proposed in this paper. Our edge-based active contour model has many advantages over the conventional active contour models. Firstly, the proposed model can get much smoother contour and needs much less iterations to evolution by being implemented with a special processing named Selectively Binary and Gaussian Filtering Regularized Level Set (SBGFRLS) method. Secondly, we introduce Bilateral Gaussian Filter which can preserve edges to smooth images. So we make weak edges more clear than traditional Gaussian Filter. Thirdly, the level set function can be easily initialized with binary function, which is more efficient to construct than the widely used signed distance function (SDF) because of the special processing. Experiments on synthetic image and segmenting liver from abdominal CT images demonstrate the advantages of the proposed method over geodesic active contours (GAC) in term of both efficiency and accuracy.
Neural Networks Application in NC Machine Reliability Researching
Authors: Zhang Hong Bin , Jia Zhi Xin , Xi An Min
Published: June 2010

The application of neural networks in Numerical Control (NC) machine reliability researching is introduced in this paper. Because of small reliability data sample, it is difficult to establish the reliability data distribution model, predict the reliability and allocate the reliability of NC machine. By using the neural networks, the reliability data of NC machine is extended. The reliability data distribution model can be established, the reliability prediction can also be done accurately. It is proved by the instance that the reliability prediction accuracy is improved 57% by the proposed method. The application of neural networks has a good reference to NC machine reliability researching.
Leakage Reduction of Improved CAL Registers Using MTCMOS Power-Gating Scheme in Nanometer CMOS Processes
Authors: Zhu Jia Guo , Hu Jian Ping
Published: June 2010

With rapid technology scaling, the leakage dissipation that begins to replace dynamitic dissipation is becoming a major source in CMOS circuits because of the increasing sub-threshold leakage current in nanometer CMOS processes. This paper introduces a MTCMOS power-gating technique, which is used for an adiabatic register file based on improved CAL (Clocked Adiabatic Logic) to reduce leakage dissipation in sleep mode. A 32 X 32 single-phase adiabatic register file are verified using HSPICE in different processes, threshold voltage, and active ratios, and BSIM4 model is adopted to reflect the leakage currents. Simulation results show that leakage losses are greatly reduced.
Manufacturing Information Recommendation Model Based on Pattern Mining
Authors: Feng Y. , Liu D.S. , Ju Chun Hua , Tian Hao
Published: June 2010

Existing enterprise information systems seldom consider different requirements from different users. To remedy this problem, the idea of manufacturing information active recommendation is put forward in this paper to deliver proper information to proper users correctly and timely. A new model called Sequence Behavior Access Pattern tree (SBAP-tree) is constructed based on the different requirements of user's identity, location, behavior habit and business needs for manufacturing information in Web environment. Using this SBAP-tree, historical situations similar to current situation could be sorted by their values, and the behavior could then be determined and output based on the association between the highly similar historical situations. Finally, an example is provided to demonstrate the effectiveness of SBAP-tree and the manufacturing information recommendation model based on SBAP-tree.
A Study on GM(1,N) Model for Teaching Evaluation
Authors: Zhu Chang Jun , Wang Bin
Published: June 2010

At present, with the popularization of higher education and acceleration of college students every year, colleges and universities are increasing scale. Expansion of the scale for colleges and universities on the one hand, broadens the scope for development, on the other hand it also brings many problems, including the issue of the quality of teaching which is particularly prominent. Owing to the problems existing in the previous system of teaching quality, based on the teaching characteristics, a new multivariate teaching quality evaluation model is set up by means of GM(1,N) theory. And the application processes of the model are illuminated in detail. The model is applied into the evaluation of teaching quality. By analyzing a lot of practical examples, the experiment result indicates that this mathematical model has better appraisal effect than other appraisal model, which can overcome the complexity of traditional evaluation model. Compared with other methods, this method is scientific, simple and operable. And its structure and method will have a bright future.
Development of the Mine Production Management Information System
Authors: Wang De Zhi , Song Guang , Wang Shu , Gan Jin Ying
Published: June 2010

The digital evaluation indexes of production management in mine can only be obtained from statistics and analysis of producing information, it can help high-level manager find problems existed in production system and make adjustment. Base on the requirement analysis of the Barun Mine Company production control information system, developed a C/S model of the system management system, which has been applied in the mine production.
A Comprehensive Reputation Based Trust Model in C2C Electronic Commerce
Authors: Wang Jun Mei , Wang Li , Xie Jun
Published: June 2010

The mistrust between buyers and sellers in C2C electronic commerce has been affecting its development. The accuracy and the reliability of the reputation system are still not high because of the existence of vicious users. This paper builds a comprehensive reputation based trust model by choosing the suitable influential factors in trust and the simulation results prove that this model has a higher accuracy and reliability.
The Analysis and Design of Hospital Information System Based on UML Model
Authors: Chen Qing Zhang , Chen Jie , Yu Yong Ming
Published: June 2010

In this paper, we used UML method to complete the whole hospital information system analysis and design. It is described the system and determine the requirement of system’s function. It also completes the system’s architecture design and detailed design and implement to the system. The main idea of thesis is as follows:
1）It adopt UML to object-oriented the modeling hospital information system, and will be a good way to solve a few questions from hospital information system in nowadays.
2）It moves around the main ideas of RUP (use-case driven, architecture-centric, iterative and incremental). At the beginning of get demand, through the system analysis, system design, until to the final of the system implementation. It adopts the stepwise deduction to go deep into the way of refining organization to anatomize the whole the process of the hospital information system.
Through the success of the hospital information system modeling to prove that the core idea of the UML-based on RUP modeling techniques is practical in the development of large-scale of application systems. At the same time, it also prepared to provide a better reference and instance for the project or team to adopt this technology.
Research on Intelligent Recommendation Method and its Application on Internet Bookstore
Authors: Chen Qing Zhang , Pei Yu Jie , Jin Yan , Zhang Li Yan
Published: June 2010

As the current personalized recommendation systems of Internet bookstore are limited too much in function, this paper build a kind of Internet bookstore recommendation system based on “Strategic Data Mining”, which can provide personalized recommendations that they really want. It helps us to get the weight attribute of type of book by using AHP, the weight attributes spoken on behalf of its owner, and we add it in association rules. Then the method clusters the customer and type of book, and gives some strategies of personalized recommendation. Internet bookstore recommendation system is implemented with ASP.NET in this article. The experimental results indicate that the Internet bookstore recommendation system is feasible.
Applications and Development of Nanotechnology in Machinery Industry
Authors: Feng Xian Zhang , Liu Ai Min , Cheng Jun Wei
Published: June 2010

Nanotechnology has become a comprehensive high-tech subject, and will be the core in the next technological revolution times. With the flourishing development of nanotechnology, it is clear that its research and development have become the hot spot these days for the international scientific community and the engineering community. In this paper, content and development of nanotechnology are discussed in details, as well as the analysis of its application in the field of micro-mechanical, non-friction micro-nano-bearings, the new metal-ceramic nano-tools, nano-magnetic fluid sealed in the ultra-fine grinding machine, etc. And looks forward to applying the nanotechnology in our country.
Study on OWL-Based Construction and Inference Method of Vegetable Products Ontology
Authors: Wu Li Qun , Zhao Ming , Liu Juan
Published: June 2010

With the rapid development of information technology, ontology is gradually used for knowledge engineering and information science sphere. Agricultural Ontology mainly is composed of the concept and relationship between concepts in agricultural knowledge, as well as the computer can identify the composition of the formal description language. The goal of build the agricultural ontology is to form a common understanding of the agricultural information organizational structure, to known and analysis of knowledge in the field of agriculture so as to further establish the foundation for the agriculture semantic web. In this paper, we present a design principles and implementation process in vegetable products domain ontology. Through the collection and analysis of the field of vegetable products information as well as the use of inference engine, used to build vegetable domain ontology with OWL. In the information extraction prototype system, we achieved a semi-automatic filled with examples of vegetable products domain ontology. Through compared to the results before and after the use of inference engine, it show that vegetables and semi-automatic domain ontology building methods is feasible.
Performance Assessment for Distributed Information Fusion System Based on Data Mining
Authors: He Yue Shun , Wang Hong Ling
Published: June 2010

This paper presents a series of methods based on data mining theory for information fusion system in order to avoid the ubiquitous problems of comprehensive evaluation in the process of information fusion. The methodology is developed by analyzing the significance factor that has impact on fusion performance based on gradual regression method and by analyzing the performance testing results of fusion by group using hierarchy clustering method. Through the analysis of performance testing results for distributed information fusion system, the factors that have effects on fusion performance and the correlation between various influencing factors have been discovered. Moreover, the performance of information fusion system is enhanced by adjusting the disadvantageous factors and improving the design methods.
Improvement of Apriori Algorithm Based on the User Interest and the Importance of Itemsets
Authors: He Yue Shun , Li Xiang
Published: June 2010

Among the many mining algorithms of association rules, Apriori Algorithm is a classical algorithm that has caused the most discussion; it can effectively carry out the mining association rules. However, based on Apriori Algorithm, most of the traditional algorithms existed "item sets generation bottleneck" problem, and are very time-consuming. An enhance algorithm associating which is based on the user interest and the importance of itemsets is put forward by the paper, incorporate item that user is interested in into the itemsets as a seed item, then scan the database, incorporate all other items which are in the same transaction into itemsets, Construct user interest itemsets, reduce unnecessary itemsets; through the design of the support functions algorithm not only considered the frequency of itemsets, but also consider different importance between different itemsets. The new algorithm reduces the storage space, improves the efficiency and accuracy of the algorithm.
Assessment Model of Corporate Governance with COBIT-Based IT Governance
Authors: Chen Jie , Shen Le Ping
Published: June 2010

Organizations are more concerned about the appropriate IT governance. The growing dependency on IT due to the increasing volume of business process automation further challenges the role of Information System Auditor. IT Governance Institute has developed COBIT as a model for this purpose.AS one of the most important and widely adopted performance measurement methods, COBIT is an attractive tool to measure and evaluate IT contribution to corporate performance. In this paper, we review the potential role of information technology as a corporate governance tool and explore the Control Objectives for Information and related Technology (COBIT). As the worlds leading IT governance and control framework COBIT should be gauged not only in simple control terms but by reference to the useful assessment of corporate governance efficiency.
Dynamic Propagation Model of Blue-Tooth Virus on Smart Phones
Authors: Huang Xiao Yan , Jin Cong , Jin Song Lin
Published: June 2010

According to blue-tooth viruses spread actuality, an epidemic model of blue-tooth phone virus is proposed in this paper. In this epidemic model, we proposed four basic statues to represent smart phones in different states. We also introduced some factors which can affect the basic trend of virus spreading, such as density of smart phones, length of malicious code and so on. But we mainly focused on parameter of spreading rate, and defined it as a variable which could change with time. At the end of this model, the simulation results showed the development tendency of this propagation model.
Mechanism of a Resource Location Approach in Power-Law Networks
Authors: Li Jing , Han Qi Yun
Published: June 2010

How to effectively locate resources is a very important factor affecting the performance of distributed system in wide area network environments. Some resource location methods have been already proposed, which utilize Small World phenomena, but have not show how to construct a Small World exactly. In this paper, on the base of Kleinberg Small World model, aimed power-law characteristics, an efficient decentralized construction approach PLSWCP(Power-law oriented Small World Construction Protocol) is proposed, which uses fairly small partial view instead of global knowledge of network. Theoretical analysis and simulations show that PLSWCP is scalable, self-adaptable, and load-balanced, improving the efficiency of resource location.
Parameter-Induced Stochastic Resonance in Wireless Sensor Network Signal Processing
Authors: Zhao Zi Kai , Hui Guo Hua
Published: June 2010

Parameter-induced stochastic resonance (PSR) using double potential well model was focused in this paper. Based on the former stochastic resonance study, system parameter µ was used to explore the resonance characteristics. A bluetooth-based wireless sensor network (WSN) was adopted to obtain the experimental data for parameter-induced stochastic resonance simulating. Under fixed noise intensity range, the changes of system parameter µ led to a systematic output resonance. Simulating results demonstrated that the systematic parameter µ could lead to stochastic resonance at signal processing level.
Design of Phase Shift Signal Generator
Authors: Xiong Guo Hai , Gao Xue Jun , Zeng Ling Li
Published: June 2010

A phase shift signal generator which has high precision and whose phase can be easily and digitally controlled is designed through utilizing DDS technology. A method which can replace complicated hardware description language programming through calling modules and setting parameters is proposed. The designed phase shift signal generator passes waveform simulation under Simulink and SignalTap Ⅱcertification, and the results obtained on the FPGA board are correct. The DSP Builder is utilized to design the phase shift signal generator, which reduces the difficulty of the design and shortens the design time.
Unscented Kalman Filter for DR/GPS Integrated Navigation System
Authors: Han Yong Qiang , Chen Jia Bin , Liu Zhi De , Zhao Dun Hui , Song Chun Lei , Yin Jing Yuan
Published: June 2010

In this paper, unscented Kalman filter (UKF) is studied to estimate the state of Dead reckoning (DR) and GPS integrated navigation system. The positioning error of DR system mainly comes from two factors, the azimuth error and odometer scale factor error. Conventional model of DR/GPS integrated navigation chooses acceleration, position and velocity as observation states, and azimuth error is not estimated, which is one of the key error sources. A new error model of DR/GPS system is adopted that includes azimuth error as a state, which makes it possible to estimate both of the two major error sources. UKF directly approximates the probability density distribution of random variable and avoids the linearization of nonlinear function, which improves the filtering precision. UKF is used to implement an improved DR/GPS system. Road test has been conducted to prove the effectiveness of the scheme.
Fault Diagnosis of Power Transformer Based on DDAG-SVM
Authors: Zhao Wei Guo , Wang Li Ying
Published: June 2010

Support vector machine (SVM) is a novel machine learning method based on statistical learning theory. SVM is powerful for the problem with small sampling, nonlinear and high dimension. A decision directed acyclic graph(DDAG) based on SVM classifier is applied to fault diagnosis of power transformer. We optimize the structure of a decision directed acyclic graph by putting SVM with higher generalization ability at the upper nodes of the decision tree. The test results show that the classifier has an excellent performance on training speed and reliability.
Modeling Knowledge Employee’s Turnover Based on P-SVM
Authors: Zhao Yong , Liu Ye Zheng
Published: June 2010

Knowledge employee’s turnover forecast is a multi-criteria decision-making problem involving various factors. In order to forecast accurately turnover of knowledge employees, the potential support vector machines(P-SVM) is introduced to develop a turnover forecast model. In the model development, a chaos algorithm and a genetic algorithm (GA) are employed to optimize P-SVM parameters selection. The simulation results show that the model based on potential support vector machine with chaos not only has much stronger generalization ability but also has the ability of feature selection.
Research on Robot Pose Control System Based on MMA7455
Authors: Han Yue Xiao , Shi Cheng Hua , Gu Yun Gao , Zhao Xiao Feng
Published: June 2010

The pose control system of robot is strictly required. This paper expatiate some methods of pose control, the design of hardware circuit and software with triaxial accelerometer and electronic compass. The results of field operation showed that the pose control system used electronic compass characteristics in high accuracy, sensitive response, stable starting running, compact structure and so on.
Development of Multilayer Situation Decision Support System and its Applications
Authors: Wan Hou Chong
Published: June 2010

In the paper, the multi-layer situation decision-making method of complex system is firstly introduced. Then, the development of the multilayer situation decision support system is put forward. At last, as a test example and an application, we use the MSDSS to achieve the optimization of the economic system in China.
Research on an Electro-Mechanical Hybrid Power Controller
Authors: Zhang Hou Sheng
Published: June 2010

Electro-mechanical hybrid power controller (EMHPC) is a kind of switch with a breaker as mechanical switch and an insulated gate bipolar transistor (IGBT) as solid-state switch. It is a key element of electrical load management center (ELMC) of the more electric aircraft (MEA). On the condition of high voltage (270VDC) and large current (200A), the proposed EMHPC in this paper features great simplicity and reliability. It has no contact chatter when the controller is turned on or off, main circuit will be shut down when contactor fault happens, it also has the feature of over-current protection for solid state switching device when large current occurs in the working circuit. The proposed controller is supported by experimental results.
Open Courses Education Model and Application Based on Moodle
Authors: Wu Hai Yan
Published: June 2010

A network open learning services support platform based on the open source moodle is constructed in this paper. First, an open teaching model based on open education resources is described, the model is based on self-learning as the center, using the real-time and non real-time two interactive way, and supported by learning support platform. then an open educational resource sharing platform, a process control and quality assurance platform, a learning support service platform are proposed in order to help students self-study and interact real-time and non real-time. finally, we presented a case based on "Java programming lanuage" course to implement the learning support service platform.
A Supervised Clustering Algorithm Based on Representative Points and its Application to Fault Diagnosis of Diesel Engine
Authors: Pang Yan Jun , Pan Wei , Liu Kai Di
Published: June 2010

By terms of extracting quantization values of each index making contributions to classification, this paper defines index classification weight; and also defines class representative points, weighted distance between samples and representative points; provides an iterative algorithm of searching class representative points, establishes a supervised clustering method based on representative points and it is apply into Fault diagnosis of Diesel Engine.
An Access Control Schema Using Fuzzy Algorithm
Authors: Peng Tao , Jiang Ming Hua , Hu Ming
Published: June 2010

A multi-policy access control model is proposed, with the model, access control based on policy regulation and XML based policy description is given. In order to describe the algorithm, we discussed the categorizing, adding, editing and canceling policy. For policy selection and decision, through fossilization and analysis of role, popedom and security policy, fuzzy algorithm is introduced for judging of user popedom. As the analysis reveals, this model can support multiple policy coordination of current models.
Exergy Analysis of Mine Water Source Heat Pump System
Authors: Wang Jing Gang , Du Mei Xia , Du Chuan Chuan , Gao Xiao Xia
Published: June 2010

This paper analyses exergy of the components of the mine water source heat pump. Evaluate the exergy efficiency and exergy loss of main components of mine water source heat pump. An example that is calculated and analyzed shows that the compressor is the main energy-saving target.
A Statistical Study of 33kV Distribution System Problems in Some States of Nigeria
Authors: Igboanugo A.C.
Published: June 2010

There are several reasons why public power supply policy in Nigeria needs to be reviewed. This paper points out the justification based on the statistical inferences drawn from an elaborate nested experimental design model fitted to a 3-year historical life-data of power failure obtained from an electricity power agency in Nigeria. Our results suggest that energy crisis is at its threshold in Nigeria and it is therefore advocated that adequate and appropriate steps need to be taken to stave off the declining trend.
Undercooling Behavior and Solidification Microstructure Evolution of Sn-Cu-Ni Solders Modified by Minute Amount of Mixed Rare Earth La-Ce
Authors: Zhou Min Bo , Ma Xiao , Zhang Xin Ping
Published: June 2010

Sn-Cu-Ni alloy solders have attracted considerable attention from electronic packaging manufacturers and suppliers owing to silver- and lead-free feature and low-cost advantage of the solders. However, there is still a lack of in-depth understanding on composition optimization and microstructure control of the solders. In the present study, the influences of the addition of a minute amount of mixed rare earth La-Ce, in the range of 0.05-0.50wt%, on melting characteristics, undercooling behavior and solidification microstructure evolution of Sn-0.7Cu-0.05Ni-xMRE (x=0.05, 0.10, 0.25, 0.50wt%) alloy solders were investigated. The results show that the addition of rare-earth La-Ce has brought about an obvious decrease of the undercooling for Sn-Cu-Ni series of solders, consequently the growth of primary solidification phase of Cu(Ni)-Sn type intermetallic compound has been suppressed and the β-Sn phase has exhibited a microstructural transition from dendritic grain to equiaxed grain with increasing the amount of La-Ce added to the solder.
Surface Modification and Repair for Aircraft Life Enhancement and Structural Restoration
Authors: Liu Qian Chu , Baburamani Pud , Zhuang Wyman , Gerrard Darrem , Hinton Bruce , Janardhana Madabushi , Sharp Khan
Published: June 2010

Maintenance of ageing military aircraft structures encompasses both engineering and scientific management. In support of this, surface modification and repair methods are used on an opportunity basis to extend the life of aircraft in terms of fatigue and safety. Often, certain surface modification technologies have proved to be both cost effective and amenable for safe application. Some candidate technologies include shot peening, cold spray, deep surface rolling, friction stir welding, laser shock peening, and laser cladding. Whilst some technologies have been successfully applied to Australian Defence Force (ADF) aircraft in the past, some newer technologies are also being considered. The supersonic particle deposition (SPD) technology also known as cold spray coating has been recently approved for application on a helicopter gear box. Another technology of significance to ADF application is Laser Cladding (LC) technology. This paper briefly summarises the research work on these technologies at DSTO and discusses potential applications for aircraft components in the near future. It also provides an analysis of technologies and their potential advantages and disadvantages.
About Dynamics Problems of the Vibroisolation System with the Gyroscopic Stabilizer
Authors: Šklíba Jan , Škoda Jan
Published: June 2010

The fundamental condition of the sufficient vibration-isolation is that all natural frequencies of a system are placed outside the interval of exciting frequencies. By the application of a gyroscopic stabilizer depend some natural frequencies on the gyroscope impulse moment. There is described how to reach the fundamental condition by the help of sufficient magnitude of gyroscopes impulse moment.
The Correction and Compensation Motors for the Gyroscopic Stabilizer
Authors: Votrubec Radek , Sivčák Michal
Published: June 2010

We have a prototype of platform that is stabilized by means of gyroscopes. Pneumatic motors are used for moving with frames. It was necessary to identify torque characteristics of these motors. It rests on control of pressure in motor and measurement of its force.
Virtual Prototyping Process Supported by New Diagnostic Method -Method of Metal Magnetic Memory
Authors: Hatłas Piotr , Juraszek Janusz , Krupa Krzysztof
Published: June 2010

The aim of this work is to implement a new nondestructive testing (NDT) method based on the metal magnetic memory (MMM) effect into comprehensive diagnostic approach for power-line connectors, which is of great practical importance. Essence of this method lies in detection of stress concentration zones (SCZs) in material of the considered element during its operation (before micro-cracks and fracture occurs). If to compare with the traditional NDT methods, which indicate SCZs after the failure (post factum), this method provides major progress in the field of NDT. In this paper an approach of connection of numerical structural simulation (static and dynamic) with MMM-based testing method is also proposed. SCZs in power-line mechanical connector were evaluated and dynamic analysis of a complete power line, which included the analyzed connector, was carried out by means of MSC.ADAMS. Uniqueness of this analysis consist in integration of FEM analysis, MSC.ADAMS multibody system analysis (for testing of working conditions in advance - during virtual prototyping) and verification using MMM method. This hybrid approach enables to accomplish diagnostic analysis of selected construction elements and provides the possibility to take into consideration actual working conditions (e.g. vibrations) of the element. Proposed diagnostics method can substantially increase operational safety of electrical connectors and lines.
Phase Locked Loop Integrated System
Authors: Charlamov J. , Navickas R.
Published: June 2010

CMOS-MEMS integration is an indispensable technique for self-calibration of electromechanical performance to make MEMS devices independent on environmental drift or fabrication errors. The goal of single-chip integration (the “holy grail” for the semiconductor timing industry) would be to include the resonator, the oscillator, the PLL and a temperature compensation circuit (TCC) on a single silicon substrate. The current structure of silicon MEMS-based devices utilizes a stacked-die arrangement, housed in a multi-chip package [1]. MEMS-based timing circuits often use PLLs, which can succumb to phase jitter and noise at higher timing frequencies.
The architecture of a charge pump phase locked loop (CPPLL) is proposed in this work. It is discussed how its functional blocks influence the overall system performance. We have performed voltage-controlled oscillator (VCO) phase noise analysis and have determined the relationship between CPPLL and VCO phase noises and have discussed the requirements and results of the accomplished design.
Passive and Active Elements in Reduction of Vibrations of Torsional Systems
Authors: Białas Katarzyna
Published: June 2010

The adverse effects of vibrations on the performance of machines and their environment are the subject of various studies. That is why already in the machine design stage the designers have to face the problem of preventing undesirable effects in the functioning of new machines as well as adapting complete machines to the requirements resulting from the current knowledge on hazards caused by these machines. There are a number of methods for preventing excessive vibrations, which have an impact on machine sub-assemblies and elements. In particular, the passive, semi-active and active vibration-reducing systems can be distinguished [4,5].
Determination of Ability of Hydrotronic Systems to Start in Low Ambient Temperatures
Authors: Jasiński Ryszard
Published: June 2010

During start-up of hydrotronic system (hydraulic system with electric control) in low ambient temperatures a faulty operation may occur. The principles and conditions of safe operation of hydraulically (hydrotronically) driven machines and devices is essential for their designers and operators. For these reasons the author did a series of tests of hydraulic (hydrotronic) components and systems under thermal shock conditions (cooled-down components were supplied with hot working medium). In such conditions starting parameters of the selected hydrotronic components and systems, which secured safety of their operation, were determined. During start-up of a hydrotronic system under thermal shock conditions elements of hydraulic components warm up in a non-uniform way, due to varying material and shape properties. This causes change of clearances between the cooperating elements and may lead to faulty performance of hydraulic components and result in machine break-down. Heat transfer coefficients between oil and swilled element were determined and used for a calculation method developed by the author. The method enables to predict correct or incorrect operation of hydrotronic system.
Sensitivity and Stability Analysis of Mu-Synthesis AMB Flexible Rotor
Authors: Mystkowski Arkadiusz
Published: June 2010

The paper presents the sensitivity and stability margin analyses of the flexible rotor supported by active magnetic bearings (AMBs) with the robust optimal vibrations control. The modal representation of the rotor finite element model (FEM) is investigated. Then, the open-loop system of the AMBs flexible rotor is established and critical speed analysis due to variation of bearing stiffness is performed. For the open-loop setup, the non-collocation effect of displacement sensors and magnetic actuators due to control stability problem is considered. The frequency mode analysis of the collocation and non-collocation system is presented. Next, the -synthesis control of 4-DOF AMBs rotor is investigated. The design process of -controllers, which cover uncertainty design and performance shape by chosen weighting function is shortly described. Then, the sensitivity function is calculated and used to evaluate the AMBs rotor stability margin for the -control and the PID control. The performance of the -controller are verified in experimental tests.
Orthonormality and Spectral Analysis for Robotics and Astrodynamics
Authors: Rugescu Radu Dan , Mortari Daniele , Staicu Stefan , Aldea Sorin
Published: June 2010

A rigid transform of the E3 space into itself stands as the basis of a complete description of mechanical motions of solid bodies, where the orthogonal and normalized character (orthonormality) of the transform matrix are used as a postulate. However, the orthonormality is in fact a consequence of the condition of rigidity. The demonstration is outlined through the spectral analysis for application in the engineering of robots and astrodynamics. The problem posed is to directly find, in a general and confident manner, the elements of the rotation matrix when the direction and magnitude of the rotational displacement are given, which is an inverse design problem. Previously solved in 2-D, this problem is now extended to 3-D problems of mechanics and an implicit suggestion is made for the n-D mechanics.
Research of Hexapod Robot Motion in Irregular Terrain
Authors: Luneckas Tomas , Udris Dainius
Published: June 2010

This paper presents two inverse kinematics methods for position calculation of one leg hexapod robot. Further it is explained how inverse kinematics method could be applied to calculate robot body position. A trajectory repetition precision experiment was conducted for evaluation of dependence between trajectory repetition and a number of points used to describe it.
The Feedback Control of Drives with Low Acceleration and Deceleration Rate of Motor
Authors: Baskys A. , Zlosnikas V.
Published: June 2010

The paper proposes an algorithm for control of processes based on variable-speed drives with low acceleration and deceleration rate of the motor, which determines the dynamics of the whole control system. The results of investigation of the controller based on the proposed algorithm are presented and discussed. The controller provides good transient performance of the control system response in case when the drives with different motor acceleration and deceleration rates are used.
Development of a Test Bench for SMA Wires
Authors: Lungu Ion , Mândru Dan , Noveanu Simona
Published: June 2010

The actuators based on shape memory alloys are described in the paper. It is shown that there is necessity to develop the actuators of compact design with amplified force. Research results of such actuators are presented.
Model of a Sensorless Induction Drive
Authors: Rinkevičienė R. , Batkauskas V. , Petrovas Andrius , Lisauskas Saulius
Published: June 2010

The paper deals with modeling, simulation and analysis of speed observer for induction drive. Mathematical model of observer is presented and its computer model is elaborated. Speed measurement results are compared with those obtained during simulations with induction motor model. Development and implementation of speed observer requires measurement of motor current and supply voltage. Simulated values of current and voltage are used in the proposed observer model instead of the real ones. Model of induction motor is developed on the basis of motor equations in stationary reference frame. Model of observer relies on nonlinear differential equations, describing performance of induction motor, additionally making use of the space-vector theory. The speed observer developed by means of direct synthesis from state equations is robust with respect to parameter and load variations.
The Simulation Spreading Process of Steel Tubes Hollow
Authors: Dyl Tomasz Cyryl
Published: June 2010

The paper presents finite element analysis of spreading process of hollow steel tubes implemented within commercial software MES FORGE2-V3.0. To this purpose, rigid-plastic model of deformed material was assumed. The analysis was realised for hollow tube made from steel C45 with external diameter D0 = 50 mm and internal one d0 = 40 mm. Distributions of temperature, stress and deformation for different values of gradient radius of mandrel  (1535) and different friction conditions on the area of metal-tool were determined. With the piercing press the billet is introduced into a vertical or horizontal die, subsequently to be pierced by mandrel. Afterwards pipe is elongated in Diescher’s mill. Hollow steel tubes undergo hot deformation spreading process in two-roll press by mandrel. Process stability depends on dimensions of the hollow tube and mandrel: tube external diameter, tube internal diameter, mandrel diameter and inclination angle of mandrel. Increase of external diameter of hollow tube occurs in the course of spreading process by mandrel. Process parameters depend on chemical composition and type of material. In this paper the contact problem in metal – tool interface is considered. Burnishing implies the sizing of a hollow tube by its plastic spreading.
The Characteristic of Surface Layers on Austenitic Stainless Steel after Glow-Discharge Nitriding Process
Authors: Sitko Artur , Szkodo Marek , Gazda Maria
Published: June 2010

This paper presents investigation of surface layers. The diffusion layers were produced by using different parameters of reactive atmosphere (N2:H2). The research of the surface layers was performed using scanning electron microscope (SEM). The results of energy dispersive X-ray (EDX) analysis and X-ray diffraction (XRD) analysis are presented. Research reveals the influence of chemical constitution of reactive atmosphere on the change of properties of nitrided layers.
Analysis of Rolling Process for Alloy on the Base of Silver BAg7
Authors: Wiewiórowska Sylwia , Muskalski Zbigniew , Suliga Maciej
Published: June 2010

The variety of industrial use of brazing solders is associated in one way with plastic properties (more plastic materials are producing in the form of wires, sheets, bands, metal leafs, meshes etc, low plastic materials in the form: pig sows, bars, powders) and in another way with the kind of joining and use soldering or brazing method. Hard solders, which include analyzed solder BAg7, have a very wide range of melting points (from 400 to 2000°C) and are applied in those cases when very high values of strength are required for soldered joint. The research was carried out for the silver-based solder designated as Bag7 according to American Standard ANSI/AWSA 5.8-92. This solder has a typical application for the brazing process of food handling equipment requiring low melting values and for brazing aluminium alloys. In the literature, except for chemical composition and temperature of brazing, we cannot find the details concerned with the method of plastic working of BAg7. In the reported research work the metallographic analysis of rolling process was performed and optimal parameters of rolling process for the considered solder were determined.
Finishing of Ceramics in a Single-Disk Lapping Machine Configuration
Authors: Barylski Adam , Deja Mariusz
Published: June 2010

Lapping of plane surfaces is the technology which allows achieving high surface quality. Kinematics of lapping has the main effect on the flatness of active plane of the lapping tools as well as on the quality and flatness of the machined surface. Lapping machines can be used for grinding without the chuck-related problems as encountered in conventional surface grinding. The configuration of a conventional single-disk lapping machine was modified and the rotational velocity of a workpiece holder can be precisely controlled by a stepper motor. Two types of tools were used for experiments on a modified machine. The first tool was equipped with grinding inserts made of resin and synthetic diamond micrograins (grit size 3/2 m). In the second stage of experiments the single-layer electroplated diamond tool (D107 – grit size 106/90 m) was applied. Ceramic workpieces (Al2O3) were machined on the modified single-disc lapping machine with the use of both tools and with additional loose abrasive. Experimental results of removal rates, technological parameters and kinematical analysis are the subject of the presented paper.
Modeling and Simulation of Tool Cycle in Manufacturing Cell
Authors: Dobrzynski Michal
Published: June 2010

The paper addresses issues concerning modeling and analysis of tool flow within a three-machine manufacturing cell used for small batch manufacturing of a definite spectrum of prismatic parts. The approach utilizes a method for job and tool allocation to work centers with limited number of machines and capacity of tool resources, based on the analysis of formalized relations: job - tool sets required. Selected tool flow control rules are considered with respect to assumed performance measures of such machining cell. These rules are amply studied using methods and means of interactive simulation. A case study derived from industrial practice, using the database of a medium-sized manufacturing company is also included.