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浏览/检索结果: 共62条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序作者升序作者降序 Design and realization of timely auto-detection based on high-precision photoelectric encoder (EI CONFERENCE) 会议论文  OAI收割 2012 2nd International Conference on Instrumentation and Measurement, Computer, Communication and Control, IMCCC 2012, December 8, 2012 - December 10, 2012, Harbin, Heilongjiang, China 作者:  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 A high-speed processing circuit based on DSP is designed to meet the increasing demand for the reliability of the high-precision encoder  and all analog signals are acquired by AD converter. The processing circuit can timely online automatically detect  diagnose and repair the fault point in time. The time of diagnosis and maintenance is highly reduced while the reliability is enhanced. The high-precision  high-intelligence and high-reliability photoelectric encoder is achieved by this method in practical application and the expected result is obtained. 2012 IEEE.   High power Bragg reflection waveguide diode lasers with twin near-circular emission spots (EI CONFERENCE) 会议论文  OAI收割 2012 IEEE Photonics Society Summer Topical Meeting Series, PSST 2012, July 9, 2012 - July 11, 2012, Seattle, WA, United states 作者:  Wang L.;  Wang L.;  Wang L. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 A novel semiconductor laser with two symmetrical near-circular emission spots separated at an angle of 62 was demonstrated using Bragg reflection waveguide. The low beam divergence of 5.4 and power of 2.6 W were achieved. 2012 IEEE.   Image quality assessment based on complex representation of structure information (EI CONFERENCE) 会议论文  OAI收割 2011 International Conference on Electrical, Information Engineering and Mechatronics, EIEM 2011, December 23, 2011 - December 25, 2011, Jiaozuo, Henan, China 作者:  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y.;  Wang Y. 收藏  |  浏览/下载：33/0  |  提交时间：2013/03/25 Local variance and single pixel value are combined to describe image structure information using complex method in this paper in order to improve the consistency of objective image assessment result with that of subjective method. The effect of the detail structure information on the image quality was emphasized by this method accordingly. Singular value decomposition was performed on local variance distribution complex matrix. The angle between the singular value vectors of the reference image and the disturbed image was used to measure their structural similarity. Then the quality assessment process was achieved. Results from experiments show that the proposed method is better consistent with human visual system characteristics than MSE  PSNR  and SSIM. 2012 Springer-Verlag London Limited.   Parameters estimation of BLDC motor for energy storage system (EI CONFERENCE) 会议论文  OAI收割 10th World Congress on Intelligent Control and Automation, WCICA 2012, July 6, 2012 - July 8, 2012, Beijing, China Wu J. 收藏  |  浏览/下载：24/0  |  提交时间：2013/03/25 This paper presents a statistical method to estimate the parameters of the brushless dc (BLDC) motor of a flywheel system for energy storage. The principle of the estimation is based on least square estimation under a reasonable constraint. Method is suitable to avoid using complicated test apparatus. Torque constant  static friction coefficient  vicious friction coefficient and inertia moment can be estimated. Furthermore  copper loss  iron loss  mechanical loss and other loss can be computed from these estimation and measurement data. By the proposed method  it is demonstrated experimentally that accuracy estimation can be achieved. 2012 IEEE.   Design of semi-physical simulation for small satellite by virtual display (EI CONFERENCE) 会议论文  OAI收割 2011 3rd International Conference on Mechanical and Electronics Engineering, ICMEE 2011, September 23, 2011 - September 25, 2011, Hefei, China Xu K.; Lv Y.; Jin G. 收藏  |  浏览/下载：23/0  |  提交时间：2013/03/25 Semi-physical simulation of attitude control system is the more synthetically test and verify for designing of small satellite control system. It is an important means of small satellite development. However  the results of current semi-physical simulation system have a lot of non-intuitive. Compare with the actual environment  the simulation environment still has striking disparity. So the shortcomings affect precision of simulation. Based on the virtual display technology  the group semi-physical simulation system has been constructed for attitude control of small satellite due to the combination with xPC real-time environment  the simulation computer  high-precision single-axis air-bearing turntable  reaction wheel  air thrust device  fiber gyroscopes  sensors synchronizer  power subsystem and wireless devices virtual display computer etc. Semi-physical simulation achieved the visual simulation in orbit and tracked new information of virtual environment of space into real-time simulation computer. Simulation results show that the simulation system for real-time attitude and orbit position of small satellite semi-physical simulation has an excellent display effect. At the same time  Real-time transfuse of orbit information provides a more accurate space environment simulation. The simulation system of small satellite attitude control to design and evaluate the more direct and convenient. (2012) Trans Tech Publications  Switzerland.   Design of controlling system in multi-function durability testing device for vehicle vacuum booster with brake master cylinder (EI CONFERENCE) 会议论文  OAI收割 2012 International Conference on Mechanical and Electronic Engineering, ICMEE 2012, June 23, 2012 - June 24, 2012, Hefei, China Hao X.; Zhang R.; Li X.; Wang M. 收藏  |  浏览/下载：50/0  |  提交时间：2013/03/25 The quality of vehicle vacuum booster with brake master cylinder is related to the safe of drivers and automobiles. The testing experiment must be executed strictly before leaving factory based on the national standards.The paper introduces the controlling system of multi-function durability testing device  which is designed for doing durable testing experiments and Anti-lock braking system (ABS) performance experiments. The structure and theory of device is presented. The controlling system is illuminated in detail. To test the dynamic property  this system was identified by a recursive BP neural network. According to the character of a great deal of sensors and actuators  the high precision  capabilities and reliability  the distributed control mode (DCS) including the computer and PLC by RS-485 bus is utilized. The four channels testing experiments are achieved at the same time. The test data is directly memorized into the computer. The results of general endurance and ABS endurance testing experiments are shown to demonstrate the excellent performance of the testing device. 2012 Springer-Verlag Berlin Heidelberg.   Application of trend extrapolation method to spectrum analysis of microtremor signal (EI CONFERENCE) 会议论文  OAI收割 2nd World Congress on Computer Science and Information Engineering, CSIE 2011, June 17, 2011 - June 19, 2011, Changchun, China Zhou X.; Guo T.; Jiao J. 收藏  |  浏览/下载：33/0  |  提交时间：2013/03/25 The trend extrapolation method is applied to spectrum analysis of microtremor signal in order to increase the spectral estimation accuracy. First  establish an appropriate extrapolation model based on the existing data series  and then fit correlation functions other than existing data by derivative least squares method  finally perform spectrum analysis using extrapolated correlation functions. Numerical simulations and the experimental results show that good results are achieved no matter correlation functions change slow or rapid  and the extrapolation error is not more than 2.3%. 2012 Springer-Verlag Berlin Heidelberg.   Synthesis, characterization, and luminescent properties of a red-emitting Europium complex (EI CONFERENCE) 会议论文  OAI收割 1st International Conference on Energy and Environmental Protection, ICEEP 2012, June 23, 2012 - June 24, 2012, Hohhot, China 作者:  Li B.;  Zhang L.;  Zhang L.;  Li B.;  Li B. 收藏  |  浏览/下载：85/0  |  提交时间：2013/03/25 a fluorine functionalized 1  10-phenanthroline ligand  3-ethyl-2-(2- fluorophenyl) imidazo[4  5-f]1  10-phenanthroline(EFPIP) and the corresponding red-emitting Eu(III) complex Eu(DBM)3(EFPIP) (DBM = dibenzoylmethanate) was synthesized and the photophysical properties and electroluminescent(EL) performances were researched. When Eu(DBM) 3(EFPIP) was used as emitting material in organic devices  the maximum efficiency and luminance of red emission achieved from the EL device with the configuration of ITO/m-MTDATA (30 nm)/NPB (20 nm)/x wt% Eu(DBM) 3(EFPIP) doped in CBP (30 nm)/Bphen (20 nm)/Alq3 (20 nm)/LiF (0.8 nm)/Al were 3.6 cd/A and 563 cd/m2  respectively. Compared with the previously reported devices based on methyl or chlorine substitute Eu(III) complexes  the EL performances of the device using Eu(DBM)3(EFPIP) as an emitter was significantly enhanced due to the introduction of fluorine. (2012) Trans Tech Publications  Switzerland.   Some observations on the size effects in nanotwined metals and their theoretical explanation 会议论文  OAI收割 23rd International Congress of Theoretical and Applied Mechanics, 中国北京/Beijing, China, 2012-08-19 作者:  Wei YJ(魏宇杰) 收藏  |  浏览/下载：17/0  |  提交时间：2014/04/02 theoretical  their  explanation  effects  system  suitable  amount  higher  dimensional  achieved  dimensions  deformed  novel  finding  change  limited  stronger  migration  exhibit  sizes   The sequence measurement system of the IR camera (EI CONFERENCE) 会议论文  OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China 作者:  Zhang H.-B.;  Han H.-X.;  Geng A.-H. 收藏  |  浏览/下载：40/0  |  提交时间：2013/03/25 Currently  the IR cameras are broadly used in the optic-electronic tracking  optic-electronic measuring  fire control and optic-electronic countermeasure field  but the output sequence of the most presently applied IR cameras in the project is complex and the giving sequence documents from the leave factory are not detailed. Aiming at the requirement that the continuous image transmission and image procession system need the detailed sequence of the IR cameras  the sequence measurement system of the IR camera is designed  and the detailed sequence measurement way of the applied IR camera is carried out. The FPGA programming combined with the SignalTap online observation way has been applied in the sequence measurement system  and the precise sequence of the IR camera's output signal has been achieved  the detailed document of the IR camera has been supplied to the continuous image transmission system  image processing system and etc. The sequence measurement system of the IR camera includes CameraLink input interface part  LVDS input interface part  FPGA part  CameraLink output interface part and etc  thereinto the FPGA part is the key composed part in the sequence measurement system. Both the video signal of the CmaeraLink style and the video signal of LVDS style can be accepted by the sequence measurement system  and because the image processing card and image memory card always use the CameraLink interface as its input interface style  the output signal style of the sequence measurement system has been designed into CameraLink interface. The sequence measurement system does the IR camera's sequence measurement work and meanwhile does the interface transmission work to some cameras. Inside the FPGA of the sequence measurement system  the sequence measurement program  the pixel clock modification  the SignalTap file configuration and the SignalTap online observation has been integrated to realize the precise measurement to the IR camera. Te sequence measurement program written by the verilog language combining the SignalTap tool on line observation can count the line numbers in one frame  pixel numbers in one line and meanwhile account the line offset and row offset of the image. Aiming at the complex sequence of the IR camera's output signal  the sequence measurement system of the IR camera accurately measures the sequence of the project applied camera  supplies the detailed sequence document to the continuous system such as image processing system and image transmission system and gives out the concrete parameters of the fval  lval  pixclk  line offset and row offset. The experiment shows that the sequence measurement system of the IR camera can get the precise sequence measurement result and works stably  laying foundation for the continuous system. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).