bluuebunny/crossref_metadata_2025 huggingface dataset:
The Discussion of the Simulation Accuracy of the Vehicle Suspension Coupled Dynamics Model
Authors: Liao Shu Hua , Bao Yu Hui , Zhou Shao Dai
Published: December 2014

Take a vehicle front suspension assembly as an example, established the dynamics model of vehicle front suspension. Compared different results of dynamics models with the opposite travel test. Proved the effect of flexible body in the vehicle suspension dynamics model. Provided a reference method for the establishment of vehicle suspension dynamics model.
Deformation of Hard Disk Drive Media Caused by Thermal Stress and Induced Air Flow
Authors: Padtha Pakornwit , Tangchaichit Kiatfa
Published: December 2014

The spindle motor in a hard disk drive spins at a high rotational speed. These rotations generate air flow and thermal stress. Air flow is induced by the surface roughness of the media that is moving at a high speed through air. This air passes over the surface of many parts in the drive, including the media. Thermal stress is generated by heat in the parts, e.g. voice coil motor, pre-amplifier, slider pole tips, which are heated by electric power and by the spinning of the spindle motor. The air flow and thermal stress cause a change in the media shape called deformation.Simulation results show the trend of deformation has more bending when the slider moves outward from the media axis. The pressure acted more on the underside than on the upper side which caused the media to bend up to the top cover side of hard disk drive. The maximum deformation, 15 μm, occurred at the rim of media while the distance between the media and the slider is 30 μm; thus they did not contact each other.
Finite Element Analysis of Anchor Impacting the Buried SOFC
Authors: Wang Ying Jian , Fan Xue Man , Yuan Feng , Hao Hai Bo
Published: December 2014

It is imminent to establish an early-warning SOFC monitoring system for anchor damage, the gravest threat to the SOFC communication, while the key to build the monitoring system is to correctly grasp anchor the response law of embedded submarine cable caused by anchor impact; ANSYS/LS-DYNA is used to perform the finite element analysis of SOFC and make the length-shape variables differences between signal fiber and reference fiber caused by anchor impact clearly, besides, combining with the sensing model of distributed optical fiber vibration sensing system, the current wave is acquired, based on what the monitoring system warn the anchoring incidents near the submarine route, which is significant to guide the design of forecasting monitoring system of SOFC.
Asymptotic Properties of Sampling Zero Dynamics for Nonlinear Systems in the Case of Time Delay and Relative Degree Two
Authors: Li Xiu Yun , Zeng Cheng , Zhou Tong , Ren Yan Jun , Li Yu Xuan
Published: December 2014

It is well-known that stability of zero dynamics is often inevitable to the controller design. And most real world plants often involve a time delay. This paper investigates the zero dynamics, as the sampling period tends to zero, of a sampled-data model composed of a zero-order hold (ZOH), a continuous-time plant with a time delay and a sampler in cascade. We first present how an approximate sampled-data model can be obtained for the nonlinear system with relative degree two, and the local truncation error between the output of obtained model and the true system output is of order , where T is the sampling period and r is the relative degree. Furthermore, we also propose the additional zero dynamics in the sampling process, which are called the sampling zero dynamics, and the condition for assuring the stability of sampling zero dynamics for the desired model is derived. The results presented here generalize a well-known notion of sampling zero dynamics from the linear case to nonlinear systems.
Study on Adaptive Fuzzy Control System of Settlement Technology
Authors: Chen Xiang Ping
Published: December 2014

Considering the production status of red mud at present, an adaptive fuzzy control system, according to fuzzy control and genetic algorithm, has been focused on. With the control of flocculants, the system fuzzy control clarity of clear solution. Adaptive neural network fuzzy inference theory is adopted to establish the mathematical model of controlled object "black box", and MATLAB for simulation, showing that the control method has good accuracy and dynamic control quality. Satisfy the requirements of practice work.
A Semantic Gateway for Home Automation Networks
Authors: Hu Si Quan , Zhang Xiao Li , Dang Wei
Published: December 2014

As a common application example of Internet of Things, the development of intelligent home automation networks is attracting more and more interests in research and industry community. It is experiencing advancement from unifying protocol standard among manufacturers to data fusion between home automation devices, although the implementation of data fusion in such a network is still a challenging task for a big difference between devices from difference vendors. This paper presents one solution for ensuring the accurate representation the semantic data of home automation devices. The ontology of 5 typical home automation devices’ was built with protégé. Based on the open source SWIP framework, the semantic gateway was constructed on Android pad. The procedure of exposing semantics for the collected data in SQLite is illustrated. Finally, this semantic gateway can allow user to access home devices’ semantic data in real time from a local RDF Browser or a remote web browser.
Research Situation of Deicing Device of Transmission Line Deicing Robot
Authors: Wang Feng Qin , Cao Chong Zhen , Wang Ji Dai , Zhou Na , Sun Ai Qin , Guo Yun Dong
Published: December 2014

It is serious harm of icing of transmission lines for power system. Deicing robots can replace manual methods, and it is the developmental tendency of transmission lines deice. Recent achievements of the deicing robot were reviewed, focusing on the research of deicing device, which provides technical reference for the design of deicer.
Manipulator Tactile Telepresence Research Based on one Type Pressure-Sensitive Sensor
Authors: Wang Chang Feng , Ji Ao Ying , Chen Jin Jun
Published: December 2014

A pressure-sensitive tactile sensor is with simple structure, well tolerated material and reliable to meet a variety of applications, particularly easy to realize the structure of the finger sensor that has a biomimetic properties. The characteristics of information collection, and the corresponding supporting technology on tactile reproduction has researched, in order to make the operator aware of the effective electric haptic, and does not appear tinglin. In addition to control the dynamic range of stimulating current, also the waveform, frequency and complete telepresence grasp process are studied.
Research on the Secondary Compensation Method of the Screw Pitch Error Based on the Laser Interferometer
Authors: Shi Xuan Li , Liu Huan Lao , Li Hao , Liu Can
Published: December 2014

The screw pitch error of the ball screw is the primary error source of reducing positioning accuracy during the process of error compensation. When using the laser interferometer compensated the screw pitch error, it was difficult to eliminate the influence of the screw pitch error on the positioning accuracy just by the first compensation .this study proposed the secondary compensation method of the screw pitch error based on the initial compensation. in order to avoid the negative effect of the high prices of the automatic compensation software, the fallibility of the manual compensation and the low efficiency of the manual compensation, this article developed a pitch error rapid compensation software. the experiment result demonstrates that the precision index of the CNC machine tools and the efficiency of compensation can be improved obviously by comprehensive using the secondary compensation method and the pitch error rapid compensation software.
A Skywave OTHR Adaptive Frequency Selection Method Based on Preliminary Criterion and Weighted Criterion
Authors: Liu Shi Hua , Liu Xian Gang , Sun Zhi Jian
Published: December 2014

A skywave radar adaptive frequency selection method based on the preliminary criterion and the weighted criterion is presented. In this method, according to the various operational tasks, the frequency selection criterion is divided into the preliminary criterion and the weighted criterion based on the characteristic of the targets. The adaptive frequency selection of the skywave radar is achieved by the weighted computed of the frequency selection criterion. The feasibility and availability is demonstrated by an example.
Method and Apparatus for Measuring the Strength of Weak Binding Coating Interface
Authors: Wang Fei , Wu Bing Hui
Published: December 2014

For the difficulty of coating weak bonding strength measurement, we proposed coating weak bonding strength measurement method and apparatus based on laser-induced shock wave. This apparatus contained the laser, the beam splitter, the photodiode, the convex lens, acoustic emission sensors and the oscilloscope. First the distance of the focus and the circular area was calculated by the interaction of laser-induced shock wave and the measurement object. The acoustic emission sensor was moved to the same distance, which was used to measure the shock wave propagation time under the same power laser beam. Finally, coating weak bonding strength is calculated by the laser-induced shock wave propagation equation. The experimental results showed that the present method and apparatus can measure weak binding strength of the coating, which provides an important reference for the coating bond strength measurement.
Study on the Influence of the Waveguide Layer to the Far Field of GaN Based Laser Diode
Authors: Liao Hui , Sun Mao Zhu , Zhang Jian Jun , Zhang Yan Wen , Fan Ting , Song Chun Yan , Yang Kun
Published: December 2014

In this paper, the far field of GaN based laser diode is discussed by using numerical simulation method. Results show that, the divergence angle θ⊥ of far field increased with the thickness of the waveguide layer as exponential decay and the divergence angle θ// of far field increased with the thickness of the waveguide layer. The aspect ratio of far field distribution increased with increasing the thickness of the waveguide layer as exponential decay.
The Development of Initial Position End-of-Line Test System for PMSM
Authors: Cao Yan Ling , Cao Ping
Published: December 2014

The resolver is widely used in the production applications due to the robust mounting and high accuracy at full range. However, the mounting accuracy of such sensors will significantly limit the torque accuracy and performance if the initial positions are not calibrated at the end-of-line (EOL) test. An initial position EOL test system is designed base on the production requirements. A simple initial position measurement method is introduced and applied to the PMSM motor, which measures the back EMF and the North mark (NM) signal of the resolver. The time difference between the back EMF zero crossing point and NM signal is divided by the back EMF period and then the initial position is calculated. The method is validated on the target bench and experiments prove the EOL test system is suit for the mass production.
Study and Application of Machine Vision Technique for Quality Detection of Agricultural Products
Authors: Mo Xin Ping , Pan Zhi Guo
Published: December 2014

The study and application of machine vision technique for the detection of agricultural products, which includes the quality detection and grading of fruits, dried fruits, vegetables, are discussed. It summarizes the existing problems of detection and grading of agricultural products based on machine vision, and analyzes the methods of solving problems through establishing a national collaborative innovation center.
Synthesis and Application of 1-(2-methyl-3-benzothienyl)-2-[3-methyl-2-thienyl]perfluorocyclopentene
Authors: Li Gang , Liu Gang , Pu Shou Zhi
Published: December 2014

A novel unsymmetrical photochromic diarylethene compound 1-(2-methyl-3-benzothienyl)-2-[3-methyl-2-thienyl] perfluorocyclopentene was designed and constructed successfully. Its optoelectronic properties have been discussed systematically, such as photochromic, fluorescence switch, kinetics experiments in hexane solution and PMMA. The consequences showed that this compound exhibited good reversible photochromism. The maxima absorption of compound closed-ring isomer 1c is 468nm. Upon irradiation with 297nm UV light, Its fluorescence intensity decreased along with the photochromism from open-ring isomers to closed-ring isomers upon irradiation with 297 nm UV light.
Synthesis and Properties of 1-(2-methyl-3-benzothienyl)-2-[2-methyl-5-(3-trifluoromethyl)-3-thienyl]perfluorocyclopentene
Authors: Liu Jing Jing , Jia Hong Jing , Pu Shou Zhi
Published: December 2014

A novel asymmetrical photochromic diarylethene 1-(2-methyl-3-benzothienyl)-2-[2-methyl-5-(3-trifluoromethyl)-3-thienyl] perfluorocyclopentene was synthesized and its photochromic and fluorescent properties were also investigated. The compound exhibited remarkable photochromism, changing from colorless to red after irradiation with UV light and the open-ring isomer of the diarylethene 1 exhibited relatively remarkable fluorescence in hexane solution. The cyclization/cycloreversion process of the compound was determined to be the zeroth/first order reaction.
Synthesis and Application of 1-[2-methyl-5-(4-hydroxymethylphenyl)-3-thienyl]-2-[2-methyl-5-(4-azidomethylphenyl)-3-thienyl]perfluorocyclopentene
Authors: Ma Le Le , Xu Hong Yan , Zhang Qing , Liu Gang
Published: December 2014

A new fluorescent switch based on a photochromic diarylethene, 1-[2-methyl-5-(4-hydroxymethylphenyl)-3-thienyl]-2-[2-methyl-5-(4-azidomethylphenyl)-3-thienyl] perfluorocyclopentene has been synthesized, And its properties have been discussed systematically in acetonitrile solution and in PMMA, such as photochromic, fluorescence switch and kinetics experiments, and its optoelectronic properties, The results showed that this compound exhibited reversible photochromism and the maxima absorption of compound closed-ring isomer 1c is 590 nm. Its fluorescence intensity decreased along with the photochromism from open-ring isomers to closed-ring isomers.
Preparation and Luminescent Property of EuxYy(TPTZ)2(POA)6 Complexes
Authors: Kang Jie , Wang Ai Ling , Qu Yan Rong , Chu Hai Bin , Zhao Yong Liang
Published: December 2014

Using anion ligand phenoxyacetic acid (HPOA) and neutral ligand 2,4,6-tri(2-pyridyl)-s-triazine (TPTZ), a series of novel europium complexes EuxYy(TPTZ)2(POA)6·6H2O. The luminescence spectra, luminescence lifetimes and emission quantum efficiencies of the complexes were studied. The results show that doping appropriate amount of Y3+ can significantly increase the luminescence intensities, prolong the luminescent lifetime and improve the emission quantum efficiencies.
The Physicochemical Properties and the Fate of Fly Ash along the Air Pollution Control Devices in Coal-Fired Power Plant
Authors: Zhang Yi , Fu Li Li , Lu Quan , Cao Xin , Lu Jian Yi
Published: December 2014

The fly ash at the exit of inlet and outlet of No.2 ESP and outlet of No.2 FGD in San-he Power Plant were sampled. The microstructure, elemental composition, particle size distribution and other physicochemical properties of the collected ash samples were tested and analyzed by a scanning electron microscope (SEM), X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Mastersizer2000 laser particle size analyzer. The results showed that, ESP outlet fly ash particle size distribution curve was significantly moved to the left, the proportion of the fine ash at the outlet was significantly increased compared with that of at the inlet, the morphology and composition of ash at the outlet of ESP, FGD was significantly changed compared to the ash at the inlet of ESP, indicating that air pollution control equipment (APCDs) have a great impact on physicochemical properties and the fate of fly ash.
Analysis of Acid Rain and the Main Effect Factors in Nanchang City
Authors: Yan Xi Feng , Wang Jing Lan , Zhou You Hua , Liu Feng
Published: December 2014

The performance of acid rain at Nanchang, China was studied in this paper. According to the monitoring data of rain from 2003 to 2012, the time characteristics and causes of the acid rain were analyzed, and the changing trends of the concentration in10 years were described by using Correlation analysis. The result shows that Nanchang air pollutants have the characteristics of obvious inter-annual variability, Rose and diurnal variation.
Design of Mousetrap Based on Solid Works Software
Authors: Ran Yu Biao , Wu Tao
Published: December 2014

This paper introduces an easy automatic mousetrap. Solid works software is used for 3D model and structure design. When compared with existing products, this design has such advantages as simple structure, convenient and practical, easy to promote, simple principle, energy-saving and environmental protection, adaptability, high efficiency.
Simulation Research of Engine’s Electronic Control System Based on Modular Modeling Method
Authors: Sun Jian Min , Gao Ling Hua , Yang Yun
Published: December 2014

Abstract. Modular modeling method was adopted to build model for the engine’s electronic control system , including the engine system model, sensor model, controller model and actuator models. For the engine system, the modeling approach of the average value was used to establish an air supply system model, the fuel supply system model and the engine power take-off model. By the method of mathematical fit, a mathematical model of electronic control engine’s sensors was established. Based on Mat-lab/Simulink, it designed simulation system and proceeded simulation tests for each model of engine control system, then the results show that the model is correct, and it can manifest the changes of relevant parameters during the actual operational process of the engine.
Application of Optical Fiber Laser Sensing Technology in Signal Detection
Authors: Wang Xia , Hu Dai Di , Wang Xiao Li
Published: December 2014

Signal of ultra high sensitive detection has important application value in the fields of electrical engineering. In recent years there has been a distributed feedback (DFB) fiber laser is a new generation of optical fiber sensing elements of the sensor. It has small size, spectral line width output laser signal is very narrow and low noise advantages, the detection sensitivity can reach high combined with high resolution wavelength demodulation technology. This paper introduces the fiber laser sensor technology and its progress in research and application of technology of detecting signal.
Study on High Specification PAC Motion Controller System
Authors: Zhao Yan Ling , Wang Ming Qing
Published: December 2014

The execution of the PLC application is accomplished through hardware, while the PAC designed a generic form of software execution cores for executing user application execution cores located between the real-time operating systems and applications, the implementation of the kernel and device hardware platform independent, this paper presents under the PLC and PC continuous development and integration of the case, its organizational structure with high computing and large storage space advantages of a PC with high stability.
An Automatic Modeling Method for Intersected Cross-Sections
Authors: Mei Song Hua , Zhao Qing , Chen Guo Liang , Leng Xian Lun
Published: December 2014

According to the intersected cross-sections, an automatic method of constructing geological model was proposed. Firstly, in this method, these cross-sections are divided into some unit cells, and the auxiliary lines are increased and sheared by some geological rules in each unit cell. Finally the geological surfaces are created to form geological entities. This method can be applied in constructing geological entity model automatically, which contains the complex geological phenomena such as Pinch-out, changes and so on. This method also can avoid the modeling process of diverse manual way, raises the modeling speed.
An Acquisition and Display Method for Multi-View 3D Models
Authors: Long Ji Chang , Ma Wei Hua , Shen Chun Lin
Published: December 2014

Based on the technology of OpenGL and DirectX Wrapper, this paper designs and implements a new general method of data collection and display for the existing three-dimensional models using in multi-view 3D display system. Firstly, by using the technology of OpenGL/DirectX Wrapper, it obtains the application information such as the models, calls and associated data. Secondly, it sends the information to all rendering nodes. Then, according to the multi-view system projection array number and expected angle threshold parameter, each rendering node does the final adjustment and calibration on the obtained information sequentially for multi-view image rendering. Finally, each node transmits corresponding viewpoint image rendered by themselves to the projection equipment, and displays stereo images through 3D device synchronously. This method can be applied to all application programs based on OpenGL or DirectX Library. It is a general method for collecting and displaying multi-view 3D data sources. Experimental results show that this method is of high acquisition and rendering process, the image quality is the same as the source and stereoscopic displays strong. It has a wide range of applications and research value in the field of Engineering.
A Novel Information Fusion Method Based on Preference Selection Index
Authors: Zheng Hui
Published: December 2014

The aim of this paper is to propose a new information fusion method for the problem of multi-sensor target recognition. Multi-sensor information fusion problem contains many characteristic indexes, and thus it can be regarded as a multi-attribute decision making problem. The new fusion method is put forward based on preference selection index method. The new information fusion method is not necessary to assign relative importance between attributes, but overall preference value of attributes are calculated using concept of statistics. Thus the new method can overcome the subjective randomness of subjectively weighting method. An applied example proves that the method is both effective and exercisable.
The Application Research of Information Theory in Education
Authors: Wang Xiu Yan , Cui Wei Ping , Xu Jun
Published: December 2014

To improve the teaching efficiency, there is a need to deeply understand the operation mode of human body engineering. Through teaching practice to analyze the teaching process, with the method of analogy, found it is similar with the process of information transmission. In this paper, the transmission of information theory is applied to the teaching practice, teaching and learning model is established based on the information transmission theory.
Applied-Information Technology Based on Data Analysis in Teaching Reform
Authors: Xu Chuan Hong , Huang Jia Jia
Published: December 2014

Applied-information technology and printing materials are very important in autonomous learning of students. Especially as for interactive learning and teaching.This research aims at studying the effectiveness of applied-information technology in regulating learners’ information-emotions teaching reforms. Under the circumstance of networking, it is undoubted a new way to research Applied-information technology and printing materials for the benefits of the development of learners in future. In the course of teaching reforms, positive-information -emotions can enhance the sense of identity, strengthen the function of cohesion, increase the learners’ interest in learning and regulate their mood with the help of networking and other information technology. Therefore, it is very essential that instructors help learners enhance their abilities to learn about and develop positive information-emotions in teaching reforms on the basis of master of applied-information technology.
The Image Compression Technology Based on Wavelet Transform
Authors: Zhao Wen Jing , Zhao Ming Jun , Pan Jian
Published: December 2014

Image compression is a data compression technology used in the digital image, its purpose is to reduce redundant information of the image data, and provide a more efficient format to store and transmit data. Due to the huge image data and the existing relatively low transport conditions, the image compression has become an inevitable. The key technology of image compression is how to transform image data, how to quantify image data, and how to entropy code the quantized data. Using two-dimensional Mallat image wavelet compression algorithm is a new method of image compression, and it is the core technology of the wavelet image compression.
An Adaptive Image Segmentation Algorithm Based on AP Clustering
Authors: Qian Chun Hua , Qiang He Qun , Gong Sheng Rong
Published: December 2014

For the shortcomings of classsical clustering algorithms: must assign the number of clusters, the initial cluster center and initial membership degree matrix, ignore the spatial structure information, we propose a novel adaptive image segmentation algorithm based on AP clustering (AAP). We calculate the AP clustering preference parameter of different images adaptively, use the color-texture feature vector to clustering segmentation. Compare to K-Means and FCM, the new algorithm is more accurate and robust.
An Effective Approach to Migrate Application to Secure Cloud
Authors: Yang Xia
Published: December 2014

In cloud computing, we have requested and used many resources from cloud vendors. Even though, hypervisor is a controller between hardware level applications and user application, Hypervisor will not provide the security for running huge user applications on guest platforms. As a customer perspective cloud is the domain which will offer numerous resources. But in cloud, when the users are running various process/applications on guest OS hypervisor will give the controlling notes or components, system configure and adaptation tools only. However, hypervisor will not have a focal point about security and need to be concerned about the possible factors for an applications which are consecutively perform on the guest OS . It doesn’t care about the end users security facts. This paper proposes an efficient security mechanism for hypervisor control to be developed / performed to improve the security aspects while application is running on virtual machine.
The Realization of New Computing Model and System Research Related to Quantum Computer
Authors: Liu Hai Yan
Published: December 2014

The ultimate goal of quantum calculation is to build high performance practical quantum computers. With quantum mechanics model of computer information coding and computational principle, it is proved in theory to be able to simulate the classical computer is currently completely, and with more classical computer, quantum computation is one of the most popular fields in physics research in recent ten years, has formed a set of quantum physics, mathematics. This paper to electronic spin doped fullerene quantum aided calculation scheme, we through the comprehensive use of logic based network and based on the overall control of the two kinds of quantum computing model, solve the addressing problem of nuclear spin, avoids the technical difficulties of pre-existing. We expect the final realization of the quantum computer will depend on the integrated use of in a variety of quantum computing model and physical realization system, and our primary work shows this feature..
Method of Data Processing Based on LaBVIEW
Authors: Yang Tie Zao , Wang Xin Yang , Wang Chang Sheng
Published: December 2014

The data processing is the important link in the process of various engineering testing and experiment. The theory and method of the data processing are correct will directly affect the accuracy of the efficiency of testing and conclusions. This paper introduces the software written in LaBVIEW to read the data acquisition system. The data of the motorcycle ignition advance Angle and fuel injection advance Angle signal data were collected by MP424 then waveform synthesis, stratified by LaBVIEW processed directly calculate the eigenvalues of the test data, and directly displayed in the chart..It to process collected data provides a new method, this method simplifies the process of data analysis, improve the efficiency of test.
Synthesis and Properties of the New Room Temperature Ionic Liquid
Authors: Xu Hai Tao , Xu Yu Tao
Published: December 2014

The new room temperature ionic liquid 1-allyl-3-methyl-imidazolium bicarbonate [amim][HCO3] was synthesized. The viscosities and conductivities of [amim][HCO3] + water and + ethanol binary mixtures were determined in the temperature range from 273.15 K to 343.15 K, and the mole fraction of the solvents in the mixtures was in the range of 0 to 0.75 for water and 0 to 0.55 for ethanol. The conductivities of the mixtures increased with increasing concentration of the solvents and temperature in the solvent concentration range studied. The viscosities of the mixtures decreased with increasing temperature.
The Effect of TiH2 Oxidation Treatment on Preparing Aluminum Foam Sandwiches
Authors: Song Bin Na , Zhong Zhao Zhun , Zhang Shun Hu , Hong Lan , Zu Guo Yin , Yao Guang Chun
Published: December 2014

Aluminum foam sandwiches (AFS) were successfully prepared by a powder metallurgical method. TiH2 powders were pre-treated in air at 450°C and 500°C for 2h in order to clarify the effect of oxidation treatment on AFS in comparison to those as-received. The decomposition curves of as-received and oxidized TiH2 powders were monitored using DSC. The macro-morphology, expansion ratio, interfacial bonding and cell structure of AFS were systematically investigated. The results show that the AFS utilize TiH2 powders oxidized in air at 450°C for 2h exhibits the best performance, under which conditions the effective bonding between the panel and core, 200% of the expansion rate and uniform pore structure of AFS have been achieved.
Synthesis and Photochromism Studies of 1-(2-methyl-3-benzofuran)-2-[2-methyl-5-naphthyl-3-thienyl]perfluorocyclopentene
Authors: Dong Xiao Rong , Xu Hong Yan , Pu Shou Zhi
Published: December 2014

A novel photochromic diarylethene was synthesized and its photochromic and fluorescent properties were investigated. The results showed that this compound exhibited reversible photochromism, changing from colorless to amaranth after irradiation with UV light both in solution and PMMA amorphous film. In hexane, compound 1a exhibited an absorption peak at 266 nm, upon irradiation with 297 nm light, a new visible absorption band centered at 530 nm emerged while the original peak at 266 nm decreased. In PMMA amorphous film, diarylethene 1a also showed good photochromism as similar to that in solution. The photochromic reaction kinetics indicated that the cyclization processes of 1a belong to the zeroth order reaction and the cycloreversion process belong to the first order reaction. Diarylethene 1a also exhibited good fluorescent switching both in solution and in PMMA film upon alternating irradiation with UV and visible light.
Development of Aluminium MMC with Hybrid Reinforcement - A Review
Authors: Singh Swarndeep , Singh Rupinder , Singh Gill Simranpreet
Published: December 2014

Aluminium metal matrix composite (Al-MMC) is the most promising area for the researcher to develop a material of high strength, elastic modulus and wear resistance and low co-efficient of thermal expansion and weight. Un-hybrid and hybrid Al-MMC can be developmed by physical combination of aluminium with single and multiple reinforcement material, respectively. The improvement in mechanical properties has been achived with the reinforcement of Al2O3, SiC and combination of Al2O3, SiC (hybrid). Hybrid Al-MMCs are found superior to un-hybrid Al-MMCs in terms of wear properties. The fabrication of hybrid Al-MMC can be done with vacuum assisted moulding process (V process) in which no binder is used, which possesses many benefits over other sand casting processes. This production route will revolutionize the automobile and other industries.
Application of Six Sigma DMAIC Methodology for Reducing Defects in a Foundry Shop
Authors: Narula Virender , Grover Sandeep
Published: December 2014

Six sigma is well known approach for process improvement using powerful statistical and engineering analysis tools. The paper presents a case study of Six sigma DMAIC methodology case study in the foundry shop of a vendor of automobile original equipment manufacturer. The authors have analyzed the casting process in detail and recommended the findings based on the case study. The authors have emphasized significance of each phase of DMAIC methodology and recommended that commitment of top management is very vital for successfully implementing six sigma projects. The authors have further recommended that management should decide that quantum of efforts and resources to be dedicated for a specific six sigma project.
Mathematical Modeling of Sensitization in Resistance Spot Welding of SS
Authors: Singh Rupinder
Published: December 2014

Stainless steel (SS) is sensitized by thermal treatment in the range of 450°C to 800°C and inter-granular attack would occur upon subsequent exposure to certain media. This study is focused on modelling the effect of sensitization (by taking into consideration hardness as the weld property) in resistance spot welding (RSW) of 304SS, before and after cryogenic treatment on tungsten electrode. In the present work, outcome of Taguchi model has been used for developing a mathematical model for sensitization; using Buckingham’s π-theorem. The parameters of significance are coolant flow rate (CFR), voltage and time. This study will provide main effects of these variables on hardness of weld joint and will shed light on the sensitization mechanism in RSW of 304SS. The comparison with experimental results will also serve as further validation of model.
Simulation of Riding a Real Mobile Robot Following the Defined Path
Authors: Wilk Piotr , Zając Tomasz , Paśnikowska Anita , Cekus Dawid
Published: December 2014

The paper presents a method that enables a race of a real mobile robot following the path defined by Catia software. On the basis of the performed simulation, the parameters necessary for task realization have been obtained and combined into a matrix, then importing and implementing them into the mobile robot. Exemplary experimental research on P, PI and PID regulators with a turbine switched off and on P regulator with a turbine switched on has been carried out.
Implementation of a Controllable Damper for Suppressing Vibration in the Technological Process
Authors: Bučinskas Vytautas , Klevinskis Andrius , Mitrouchev Peter , Urbanavičius Robertas
Published: December 2014

The paper deals with the problem of suppressing vibration of the arm of Motoman SSF200 robot within the frame of the technological process. Based on an overview of literature, a semi-active vibration control system was selected and a double ended magnetorheological damper (MR) was designed. After testing the acceleration of the robot arm in milling operation without the MR damper, the device was employed and the acceleration of the robot arm in four operation modes was experimentally tested.The conducted research has proved that the double ended MR damper can be practically applied for suppressing the vibration of the robot arm. The higher power to the electromagnet of the MR damper is exposed, the better vibration suppression is. This means that by changing the strength of current, the technological process of the robot arm is under control. Thus, control over the technological process is simplified when the physical characteristics of the milled material, milled tool or operation vary.
Effect of External Excitation on Dynamic Characteristics of Vibro-Isolating Table
Authors: Jurevičius Mindaugas , Kilikevičius Artūras , Ragauskas Paulius
Published: December 2014

Performance of optical table with pneumatic vibration isolators is analyzed within 2–50 Hz frequency range. Specific vibrational excitation platform with a vibrator of the frequency range of 1–50 Hz in one of three directions were tested.The following pneumatic vibration isolator dynamic parameters were identified:transmissibility of vertical oscillation characteristics at 50 Hz frequency range;resonant frequency (vertical direction);damping efficiency at 5 Hz to 10 Hz for excitation frequencies.
Vibrodiagnostics and Monitoring of the Mechanical-Dynamic Elements of Mechatronic Systems
Authors: Čereška Audrius
Published: December 2014

The article examines the diagnostics of mechatronic systems and the possibilities of monitoring their facilities. The paper describes the stages of vibrodiagnostic research on the mechatronic system and refers to the measures for taking control that includes transducers, boosters, blocks of supply, programs, etc. The work employs a methodology for performing the analyses and vibrodiagnostic measurements of the mechanical-dynamic elements of mechatronic systems.
Multi-Criteria Decision Making Methods for Designing Optomechatronic Systems
Authors: Giesko Tomasz
Published: December 2014

When designing unique optomechatronic systems with the application of innovative solutions, decision making with respect to a number of technical and economic criteria seems to be an essential problem. The multi-criteria decision theory is a process of selecting the best solution to the set of alternatives. The paper presents the application of the TOPSIS method for working towards a solution to decision making in the process of designing a unique measurement vision system. The set of alternatives for the vision system has been considered with regard to benefit and cost criteria. As a result, the best alternative has been identified, which represents the highest similarity to the ideal solution expressed by the value of the relative closeness index.
F-16 Virtual Cockpit: A Project on Computer-Aided Learning and the Application of Integrated Diagnostics: Part II
Authors: Grzesik Norbert
Published: December 2014

Part II of the publication concerns the next module of the project on the virtual cockpit. It is a very useful and handy educational tool for young flying adepts and ground personnel who can improve their knowledge about F-16 on-board operations on avionics and armament systems. The students (pilots and technicians) can also get familiar with integrated on-board diagnostics subsystems. Moreover, the paper examines a possibility of analysing malfunctions and faults faced during flight and within the process of maintenance.
Modeling and Evaluation of Loads in Vehicles Subjected to Mine Blast
Authors: Iluk Artur
Published: December 2014

In the paper, the numerical and experimental approach to the blast load evaluation was presented. The evaluation process is done in two steps. In the first, the full scale blast test is carried out with a simply mock-up resembling geometry of the bottom part of a vehicle. The pressure impulse is measured indirectly using a high speed camera and the motion analysis software. In the second step, a numerical simulation with the use of Multi Material Arbitrary Lagrangian-Eulerian method is utilized to assess the influence of the fluid-structure interaction and the real vehicle mass on the value of the applied pressure impulse. In the paper, the application of method was presented and the results were discussed.
Parametric Identification of the Degenerate Model with a Dissipative-Elastic Element Dispersing Impact Energy
Authors: Jamroziak Krzysztof
Published: December 2014

The article discusses the issues regarding the identification process of the ballistic impact on a shield of composite construction. Using a mathematical model of the phenomenon of piercing the material with a bullet fired from a firearm, it has been assumed that the resisting force F of the material is described by a non-linear function consisting of the elastic element and the dissipative element. Identification equations have been derived for specific structures of the model. The studies related to the response of the model to pulse load have been conducted by numerical simulations the results of which have been verified by the tests conducted in a shooting range.
Speed Control of a DC Motor Using PD and PWM Controllers
Authors: Miková Ľubica , Virgala Ivan , Kelemen Michal
Published: December 2014

One of the most commonly used actuators in industry are DC motors because of their relative control simplicity, small dimensions and a low price. The paper analyses a DC motor with focus on speed control using two different approaches. First, a mathematical model of the DC motor is introduced. For controller design, two methods, namely the frequency shaping method and PWM control, are used. Both approaches are simulated and compared to each other. For running simulations, software Matlab/Simulink has been applied. The conclusion discusses the advantages and disadvantages of the employed control methods. The contribution of the paper brings information about the advantages and disadvantages of approaches.
Accomplishing Tasks in Reaching the Goal of Robot Formation
Authors: Burghardt Andrzej
Published: December 2014

The article presents a hierarchical steering system for developing mobile robots and fulfils the established goal in unknown surroundings. The task was carried out with reference to a cooperative combination of elementary behaviour patterns such as finding destination and avoiding obstacles, and was generated using the Kohonen neural network. The paper has assumed formation shape and considered the right of steering other robots in the formation process. Finally, the proposed solution has been verified.
Viscosity in Exploitation Time Analysis of the Lubricating Oil Used in the Combustion Engine of the Personal Car
Authors: Sikora Grzegorz , Miszczak Andrzej
Published: December 2014

The aim of this study is to develop a mathematical model of the lubricating oil viscosity changes during the exploitation time of the engine.The aim was achieved by measurements of dynamic viscosity of engine oil used in a passenger car Volkswagen Touran equipped with a turbocharged diesel engine with a capacity of 2.0 liters. The recommended interval for oil change in this engine model is 30000 km. Oil used in this study was Shell Helix AV-L (viscosity grade SAE 5W30, designation VW: 50700).Viscosity tests were made on a Haake MARS III using two measuring systems. The first consisted of a plate-cone system with Peltier element for temperature stabilization. The second one is the high shear rate chamber with temperature control thermostat co-operating with ultra-A40 AC200 which can operate at temperatures ranging from-40 °C to +200 °C. The high shear rate chamber, consisting of a measuring cylinder and the rotor, the shear rate can achieve up to 200000 s–1.Dynamic viscosity measurements were performed at temperatures ranging from 20 °C to 90 °C.The results of the research are shown in the graphs and in tabular form. Obtained graphs made it possible to determine characteristics of the oil ageing for each mileages, temperatures and shear rates.
The Use of the Vibroacoustic Method for Monitoring the Technical Condition of Aero Engines with Extended Time between Overhauls
Authors: Spychała Jarosław , Majewski Paweł , Żokowski Mariusz
Published: December 2014

The article presents some aspects of several years of work on the use of the vibroacoustic method (Non-Destructive Testing) for assessing a turboprop engine from a trainer aircraft. The functioning engine does not have an operating system for measuring vibration, and therefore the current levels of vibrations and its changes in trends are not known. In order to extend its service life, performing a number of works was required. On the basis of assessing the current state of the engine, opportunities for further exploitation were identified thus developing methodology for evaluating technical condition regarding the whole population. The paper shortly describes the object and equivalent tests on the engine. The article focuses on the methods prepared for extending life between overhauls required for turboprop engines and discusses the results received during their implementation.
Convergences of Cumulative Wear after Time of Bearing Operation
Authors: Wierzcholski Krzysztof , Miszczak Andrzej
Published: December 2014

The numerous machine exploitation problems in the field of the experimental and numerical wear slide bearing determination problems demand to know information referring the features of the sequence of the existing wear process during the operation time. The above-mentioned information includes the velocity of the wear values increases during the particular time units of the operation and convergence and divergence properties of the wear value increases are very important. If we have two wear value increase processes, then very important is information which process is divergent more slowly. On the other hand, in comparison between two convergent processes, we must decide which process is convergent more quickly.
Mechatronic Applicator for Dispersion Adhesives
Authors: Zbrowski Andrzej , Samborski Tomasz , Zacharski Szymon
Published: December 2014

The article presents the operation and structure of a dispersion adhesive applicator dedicated for printing industry. Contrary to the currently used solutions in which the length of the glue layer is defined by the geometry of the glue roller, the original device enables free formation of the relation between the bonding area and adhesive-free areas. Based on the analysis of geometrical and time dependencies characterising the designed device, a mechatronic control system was developed to enable repeated glue application synchronised with the markers commonly used in printing industry and applied onto the paper. Constructed based on a programmable PLC controller, the system has control over all crucial technological parameters of the process (temperature, glue amount, beginning and end of the bonding area). The user-device communication is interactive, and therefore an additional user panel (touch-screen) is employed. The developed solution was used for applying dispersion adhesives in a technological line for producing multilayer ID cards with RFID labels.
Analysis of Tribological Processes in Components of Massive Roller Bearings
Authors: Napadłek Wojciech
Published: December 2014

The paper presents an analysis of tribological processes on the surface layer of large roller bearings parts carried out on bearing steel 100CrMn6. Laboratory tests carried out on roller bearings elements eg. the axle railway wagons exploitation around 600 thousand km. Modern optical microscopy with fiber optic transmission and special software was used; scanning electron microscope was applied to analyze surface stereometry; profilometers made an analyze of seizure of co-working tribological parts: roller – race roller bearings. In addition, the documentation of characteristic tribological processes occurring during the exploitation the bearings was completed. Seizure zones contact surface which occur under high and variable loads and friction were found.
Health Monitoring of the Aircraft Structure during a Full Scale Fatigue Test with Use of an Active Piezoelectric Sensor Network
Authors: Dziendzikowski Michal , Dragan Krzysztof , Kurnyta Artur , Klysz Sylwester , Leski Andrzej
Published: December 2014

The paper presents an approach to develop a system for fatigue crack growth monitoring and early damage detection in the PZL – 130 ORLIK TC II turbo-prop military trainer aircraft structure. The system functioning is based on elastic waves propagation excited in the structure by piezoelectric PZT transducers. In the paper, a built block approach for the system design, signal processing as well as damage detection is presented. Description of damage detection capabilities are delivered in the paper and some issues concerning the proposed signal processing methods and their application to crack growth estimation models are discussed. Selected preliminary results obtained during the Full Scale Fatigue Test thus far are also presented.