Showing papers in "Mechanical & Electrical Engineering Magazine in 2008"
Journal Article•
TL;DR: In this article, the authors reviewed the development history of modular reconfigurable robot in the past two decades and forecasted the key technology and challenges of future development, which may provide a direction of modular robot for future development.
Abstract: Firstly,the deveopment history of modular reconfigurable robot in the past two decades was reviewed.The modular reconfigurable robot concept,characteristics,classifying method,the main research content and the latest study status were also introduced.Then technology performances of our country in modular reconfigurable were summarized.In the last section,key technology and challenges of future development were forecasted,which may provide a direction of modular reconfigurable robot for future development.
6 citations
Journal Article•
TL;DR: Pulsed power technology has been widely applied in the domains of national defense, scientific research and high fresh techniques, moreover, now it is also applied in civilian industrial departments.
Abstract: Pulsed power technology has been widely applied in the domains of national defense,scientific research and high fresh techniques,moreover,now it is also applied in the civilian industrial departments.It is one of the key technical foundations in the research of new high technology,with their wide prospects for the development and application.The development and application actuality of pulsed power technology at home and abroad were introduced at first.And then,three great key technologies with their research progress that exist in the investigation of pulsed power technology were generalized,including energy storage technology,switch technology and high current measurement technology and so on.Finally,its development directions were summarized.As an important component of modern high technology fields,pulsed power technology will more and more apply in industrial and civilian sector as well as in high technology and defense research fields,through the continual development.
5 citations
Journal Article•
TL;DR: K-mean algorithm shows great utility and a lot of advantage in the area of unsupervised classification of remote images and the influence of iterating number in classified images was found by looking for the difference among different classified images which was got by using different iterating numbers.
Abstract: K-mean algorithm shows great utility and a lot of advantage in the area of unsupervised classification of remote images.The maximum-minimum choosing center method was used to choose the clustering center,then the unsupervised classification of remote images was realized.At that step,choosing VC++2005 as the developing platform,the classification time was greatly decreased and the main procedure code for the realization of classification was given out.At last,the influence of iterating number in classified images was found by looking for the difference among different classified images which was got by using different iterating number.
5 citations
Journal Article•
TL;DR: The experimental results show that the method has a higher identification rate and great potential in analyzing other non-stationary physiological signals.
Abstract: A method to extract surface electromyography(SEMG)'s features and identify hand's motion modes was presented,based on wavelet packet transformation(WPT) and Elman neural network.On the foundation of the pretreated SEMG,wavelet packet energies in different frequency bands were selected as feature vectors.Then,the obtained vectors can be as the inputs of Elman network to identify four motion patterns that were palmar dorsiflexion and flexion, hand opening and closing.The experimental results show that,compared with other analysis methods,the method has a higher identification rate and great potential in analyzing other non-stationary physiological signals.
5 citations
Journal Article•
TL;DR: Simulation results show that, the improved algorithm has a higher efficiency of energy utilization and can utilize the energy of the sensor nodes and prolong the lifetime of the whole network in theory.
Abstract: LEACH is a low energy adaptive clustering hierarchy algorithm for wireless sensor networks,it can prolong the lifetime of the networks by fifteen percent.But,the clusters are built after cluster-heads are selected in LEACH algorithm,so cluster-heads spend more energy;the periodic establish of clusters and selection of cluster-heads need cost the extra expenses;the distribution of the clusters is unreasonable because of the random choice of cluster-heads.The improved algorithm used the stationary cluster;the shape of the cluster was unequal,the radius of the cluster that was far away from the sink node was smaller than the radius of the cluster that was close to the sink node;the cluster-heads were selected according to the present energy of the nodes.The new algorithm can utilize the energy of the sensor nodes and prolong the lifetime of the whole network in theory.Simulation results show that,the improved algorithm has a higher efficiency of energy utilization.
4 citations
Journal Article•
TL;DR: Analysis shows that it's an effective method to apply APDL to object-oriented programming in magnetic circuit design.
Abstract: The software developed with APDL language of ANSYS was introduced and was used for the optimization of magnetic circuit of the magneto-rheological damper.The function of auto-mesh and auto-load ampere density was realized.By dealing with the result of post processing,the optimized results were given.Analysis shows that it's an effective method to apply APDL to object-oriented programming in magnetic circuit design.
4 citations
Journal Article•
TL;DR: In this article, the analysis of loop power flow is focused on the steady state power floor that would cause the transmission lines or equipments overloaded and the transient process is ignored, and the mathematical expression of the loop flow is established and discussed.
Abstract: In the analysis of loop power flow,the steady-state power floor that would cause the transmission lines or equipments overloaded is focused on and the transient process is ignored.Based on the analysis of the transient process in time domain,the mathematic expression of the loop power flow was established and discussed.The main factors that determined the loop power flow were found.The transient simulation of loop power floor was carried out.The simulation results verify the correctness of the result.
4 citations
Journal Article•
TL;DR: In this paper, an order-based hybrid GA (GA) was proposed to avoid the illegal individuals by using order crossover and insert mutation operators, and according to Lamarckian evolutionary principle, an iterative hill climbing method was inserted to improve the search ability.
Abstract: Considering the difficulty(NP-hard) of the problem,an order-based hybrid genetic algorithm(GA) was proposed.Special genetic operators(order crossover and insert mutation) were designed to avoid the illegal individuals.Moreover,according to Lamarckian evolutionary principle,an iterative hill climbing method was inserted in order to improve the search ability.The result of simulation experiments shows that the proposed algorithm is efficient.
4 citations
Journal Article•
TL;DR: A summarization of de-icing methods, including thermal methods, mechanical methods,Mechanical methods and building special cables, considering the situation of china were made.
Abstract: Ice accumulation on transmission lines may result in damage to power system.Many studies about de-icing were undertaken.A summarization of de-icing methods was made,including thermal methods,mechanical methods and building special cables.The feasibility of the methods considering the situation of china was analyzed.At last,the disadvantages of these means were summarized,the development trend and the research direction were pointed out.
3 citations
Journal Article•
TL;DR: Based on the principle of active magnetic bearing system, a 3D-finite element model of the rotor was established by ANSYS90 initial four order natural frequencies and vibration model shapes were calculated by method of Subspace, and compared with the results of experimental modal analysis.
Abstract: Based on the principle of active magnetic bearing system,a 3D-finite element model of the rotor was established by ANSYS90Initial four order natural frequencies and vibration model shapes were calculated by method of Subspace,and compared with the results of experimental modal analysisAnalysis shows that the results obtained by experimental model analysis(FEA) are basically consistent with that by finite element method(EMA)It provides realiable theoretical basis for flexible rotor system design
3 citations
Journal Article•
TL;DR: A color image quantization algorithm based on kernel clustering was proposed that has rather good performance with low complexity, robustness and highly practical value.
Abstract: A color image quantization algorithm based on kernel clustering was proposed.The data was mapped from their original space to a high dimensional space so that no-linear problem may become linear one in feature space.The algorithm was realized with Delphi.The experimental results show that the algorithm has rather good performance with low complexity,robustness and highly practical value.
Journal Article•
TL;DR: In this paper, a dynamic model of electric power steering under proportion differential control manner was set up and a 2-order model was deduced, and an analysis was carried out to get the influence under different control parameters, and "changeable differential gain according to the vehicle velocity" control manner is put forward.
Abstract: A dynamic model of electric power steering under proportion differential control manner was set up and a 2-order model was deduced.Based on the model,an analysis was carried out to get the influence under different control parameters,and "changeable differential gain according to the vehicle velocity" control manner was put forward.The simulation results show that,the control manner takes good advantage of the EPS feature to improve the EPS performance,and it is better than the unchangeable differential gain control manner.
Journal Article•
TL;DR: The system can detect the presence of an unknown worm by reaching high accuracy, so that it can be well known that the model using SVM active learning the less prior knowledge has a good performance on detecting unknown computer worms.
Abstract: In order to prevent the huge damage caused by computer worms,an innovative approach using support vector machine(SVM) classifier for detecting unknown computer worm based on the measurement of computer performance was proposed to alarm Internet usersIn the experiment,system features were monitored from window performance counters with different applications running on and bayesian network theorem was applied on selecting features from which the judging rule is deduced by SVMAs proved by the result from testing experiment,the system can detect the presence of an unknown worm by reaching high accuracy,so that it can be well known that the model using SVM active learning the less prior knowledge has a good performance on detecting unknown computer worms
Journal Article•
TL;DR: A new algorithm called MVS camera calibration method was presented, in which the influences and solving methods of lens radial and tangential distortion was well considered, and shows that the method has a good property for the application to multi-platform and is better than the other two methods in precision and efficiency.
Abstract: In order to complete the camera calibration in forming processing,the OpenCV(open source computer vision library)was discussedBased on algorithm of Tsai and principle of traditional camera calibration,a new algorithm called MVS camera calibration method was presented,in which the influences and solving methods of lens radial and tangential distortion was well consideredThe result shows that the method has a good property for the application to multi-platform,and is better than the other two methods in precision and efficiency of calibrating the camera extrinsic and intrinsic parametersIt can meet the needs of application for machine vision to traditional forming processing areas
Journal Article•
TL;DR: In this article, a design pattern for filament winding of torus was presented and the geodesic function was constructed based on differential geometry, and then Romberg algorithm was introduced to solve the geometry function.
Abstract: A design pattern for filament winding of torus was presented.Firstly,the geodesic function for filament winding of torus was constructed based on differential geometry,and then Romberg algorithm was introduced to solve the geodesic function.The pattern of adopting double guide heads and geodesic for filament winding of torus was put forward.A computer simulation system of filament winding process was developed to verify the correctness and practicability of the winding pattern.Meanwhile,all of these results can be regarded as the theoretical foundation of the applications of torus for the filament winding.
Journal Article•
TL;DR: Experimental results indicate the high reliability and practicality of SVM induction motor fault diagnosis, and validate the advantage of SVD, as well as automatically classifying the three faults and testing the classification results.
Abstract: The motor fault will bring great loss in economy and safetyAn accurate fault diagnosis system can reduce the risk in great degreeIt is favor of normal life and productionThe principle of support vector machine(SVM) and least square support vector machine(LS-SVM) algorithm were describedAn induction motor fault diagnosis experiment using LS-SVM was investigated,based on comparing normal state with three different artificial faults,automatically classifying the three faults,and testing the classification resultsExperimental results indicate the high reliability and practicality of SVM induction motor fault diagnosis,and validate the advantage of SVM
Journal Article•
TL;DR: Aiming at the problem of vice-frame's quality redundancy and from the start with lightweight study of fuel-cell car, using optimization software with computer-aided, a former viceframe's structure of fuelcell vehicle was redesigned as mentioned in this paper.
Abstract: Aiming at the problem of vice-frame's quality redundancy and from the start with lightweight study of fuel-cell car,using optimization software with computer-aided,a former-vice-frame's structure of fuel-cell vehicle was redesigned.By aluminum alloy materials,the structural optimization of the electric cars' frame was done,the checking and analyzing of the new frame were processed.The results of analysis show that the lightweight performance of the frame's new deputy are much better than the originals at the same time,the suggestions of the fuel cell vehicles's lightweight are further put forward.
Journal Article•
TL;DR: The safety and reliability of the wearable exoskeleton man-machine system mainly depended on its mechanical design, actuation, control strategy and so on as discussed by the authors, and the system safety evaluation criteria was proposed by researching on the system design, operation and maintenance.
Abstract: The safety and reliability of the wearable exoskeleton man-machine system mainly depended on its mechanical design,actuation,control strategy and so onIn order to improve the system safety and reliability,the system safety evaluation criteria was proposed by researching on the system design,operation and maintenanceAttention was also devoted to the system reliability,mainly related to sensors data fusion,control architecture and fault handlingSuggestion was provided to draft rules for its safety and reliability evaluation,which can make reference for developing the exoskeleton man-machine system
Journal Article•
TL;DR: The system was improved for the control of motor, the design of communications between upper and lower computers, and the transformation of A/D signals, by using solid state relay, microcomputer control units, and chip ADC0809.
Abstract: For realizing the required detection system of test bench,the design of the system was given based on the mechanical structure.The entire detection system was consists of data acquisition,data processing and data output.With these three functions,the inspection data was collected,the operation of test bench was controlled and the test data was sent to host computer for analysis.The system was improved for the control of motor,the design of communications between upper and lower computers,and the transformation of A/D signals,by using solid state relay(SSR),microcomputer control units(MCU) and chip ADC0809.The test shows that design meets the demand of detection system with acceptable precision.
Journal Article•
TL;DR: In this article, a model-free adaptive control approach of a class of SISO nonlinear discrete-time systems based on linearization of tight format was applied to the pH process control.
Abstract: According to extraordinary nonlinear,long time-delay and large-inertia characteristics in single-step neutralization process.It's difficult to be accurately controlled by conventional PID controller.The model-free adaptive control approach of a class of SISO nonlinear discrete-time systems based on linearization of tight format was applied to the pH process control.In the new controller,there were few parameters derived on-line from the input and output information of the acid-bases neutralization process system using a novel parameter estimation algorithm.The simulation control results show that the algorithms exhibit such advantages as anti-time-delay,anti-large-inertia,quick response,and high control accuracy.
Journal Article•
TL;DR: Large users of the typical substation region were assembled and provides reference for power supply departments in the load management, substation planning, state estimation and so on.
Abstract: With the situation of power shortage easing gradually in recent years,the power supply department's focus has already been changed from the shortage in power supply to that in power grids,which has very important significance to the power grid construction and planning in the bottleneck region and the research of local power users' load mode.Based on the power-consumption field service and the management system for large users load data by power departments,with the current more popular types of data clustering analysis,large users of the typical substation region were assembled.By comparing with the traditional national economic sector category for analog,it provides reference for power supply departments in the load management,substation planning,state estimation and so on.
Journal Article•
TL;DR: In this paper, the effect and influence degree of rubber spring to hydraulic engine mount was reviewed, and a design direction of hydraulic engine mounted was given, and the different influence degree under different finite element models and structure parameters was calculated and analyzed.
Abstract: Taking the rubber spring of a hydraulic engine mount for car power-train as an example,the study method for finite element analysis(FEA) of rubber isolator was studied.The fundamental theory for the FEA of rubber component and process of the FEA model with non-linear finite element software-ABAQUS were introduced.The different influence degree under different finite element models and structure parameters was calculated and analyzed.Then the influence degree under different stiffness rubber springs of hydraulic engine mount was analyzed.The effect and influence degree of rubber spring to hydraulic engine mount was reviewed,and a design direction of hydraulic engine mount was given.
Journal Article•
TL;DR: The sample testing shows that the leak detection system is real-time and accurate, and meets the design requirements.
Abstract: The leak detection of thermal plastic PET bottles is demanded in beverage industry.On the basis of large number of tests,the beverage bottles leak detection system was researched and designed.Taking 16-bit single-chip MSP430 as the core processing units,cylinder and pressure sensor was used to perform detection.Through the data analysis,leakage bottles could be determined and alarm signals made.The function of triggering follow-up failed products excluding system was also added.The sample testing shows that the leak detection system is real-time and accurate,and meets the design requirements.
Journal Article•
TL;DR: The experimental results show that the wireless temperature-and-humidity monitoring system has simple structure, high reliability, good extensibility and flexible configuration.
Abstract: In order to overcome the disadvantages of temperature and humidity monitoring wired system such as many wires,complicated arrangement,and difficult maintenance,according to the temperature and humidity monitoring needs of greenhouse,barn storage and so on,a wireless design scheme of temperature and humidity information monitoring was proposed.The network structure,the design of the hardware and software modules of the monitoring system were discussed in detail.And finally the point-to-point star-formed wireless sensing network was carried out.The experimental results show that the wireless temperature-and-humidity monitoring system has simple structure,high reliability,good extensibility and flexible configuration.
Journal Article•
TL;DR: The experimental results show that the analysis provides an effective modeling method in power information system for further developing the digital grid.
Abstract: According to state grid "SG 186" project,the background in current power information system was studied.By using UML modeling technology,a new modeling theory and method based on common information model(CIM) was proposed and applied to the actual project.Through modeling transformer asset,effectiveness and advantages were proved.The experimental results show that the analysis provides an effective modeling method in power information system for further developing the digital grid.
Journal Article•
TL;DR: An improved Canny edge detection algorithm was presented to obtain thin and robust edge and indicates that the improved algorithm has a better accuracy and precision in the edge detection.
Abstract: Aiming at the defects of the Canny eage detection algorithm,an improved Canny edge detection algorithm was presented to obtain thin and robust edge.Firstly,nonlinear diffusion filter was used to wipe of noise efficiently and kept the edge information of the image.Secondly,gradient calculation of pixel diagonal direction was considered in the calculation of neighborhood gradient amplitude which further repressed the impact of noise.Thirdly,using average interclass variance,the self-adaptively double thresholds for different images were calculated.The results of the experiment indicate that the improved algorithm has a better accuracy and precision in the edge detection.
Journal Article•
TL;DR: Starting from the occupation training demand of Xinjiang oil field to the type of work in oil extraction, the design of oil extraction simulation training system was researched, with the thought of combining train and identification for the occupation skills.
Abstract: Starting from the occupation training demand of Xinjiang oil field to the type of work in oil extraction,the design of oil extraction simulation training system was researched,with the thought of combining train and identification for the occupation skills.The overall structure design of simulation training system for oil extraction was analyzed,the water flooding and oil gathering simulation training system,the dynamic management simulation training system for oil filed production,the monitor and management system,and the functions of oil extraction automation simulation training system were discussed.Software system designs of the simulation training were introduced.
Journal Article•
TL;DR: The available fault diagnosis methods of dynamic control system were reviewed and there were analytical model-based approach, signal processing based approach and knowledge- based approach.
Abstract: The available fault diagnosis methods of dynamic control system were reviewed.First,the fault diagnosis methods were classified into three categories.There were analytical model-based approach,signal processing based approach and knowledge-based approach.These three categories of fault diagnosis methods were introduced in detail.The new development recently and some typical application results of these three categories of fault diagnosis methods were extensively reviewed.Finally,several hot problems to be studied in this field and the development trends were pointed out.
Journal Article•
TL;DR: In this paper, a finite element technology was employed for friction disk coupling heat stress based on the established physical model of heat conduction in engaging process of clutch, the finite elements were analyzed to acquire the temperature distribution and heat distribution of friction disk under thermal loads.
Abstract: The clutch is an integral of the automotive transmission system,where as friction disk,a major part of the clutch,impacts significantly on clutch performanceIn order to improve its performance,a finite element technology was employed for friction disk coupling heat stressBased on the established physical model of heat conduction in engaging process of clutch,the finite elements were analyzed to acquire the temperature distribution and heat distribution of friction disk under thermal loadsThe experimental results show that it is significant for the design and use of clutch
Journal Article•
TL;DR: Simulation results demonstrate that the new fuzzy immune PID speed control method has advantages of rapider response, smaller overshooting number, better robustness and stronger anti-interference capability, compared with the traditional PID speed Control method.
Abstract: The traditional PID speed control method is unable to meet the industrial sewing machine requirement of high dynamic and high adaptive performanceUsing immunity and feedback mechanism from biology for reference,a control method of fuzzy immune PID was proposed to control the speed of permanent magnet synchronous motor(PMSM)The fuzzy immune PID speed control model was presented,the traditional PID speed control method was improved through studying genetic algorithms and fuzzy immune control algorithmSimulation results demonstrate that the new PID speed control method has advantages of rapider response,smaller overshooting number,better robustness and stronger anti-interference capability,compared with the traditional PID speed control method