检索结果-内蒙古大学图书馆

Study on multi-equipment failure prediction based on system network

Sensors and Transducers 2013年第11期158卷 427-435页

作者： Sun, Fayu Gao, Lei Zou, Jinlong Wu, Tao Li, Jing Science and Technology on Electromechanical Dynamic Control Laboratory Xian Shaanxi 710065 China Computer Science School Xi'an Polytechnic University Xi'an Shaanxi 710048 China School of Electronic Information Engineering Xi'an Technological University Xi'an Shaanxi 710032 China

For failure prediction and information interaction problems of multi-equipment health management, fault prediction technology of multi-equipment and multi-parameter was proposed based on the system network. The state judgment and fault diagnosis algorithm is adopted by SOM self-organizing feature map neural network, the network parameters and node structure are changed adaptively, and the real-time updating of running status of equipment fault detection is realized. The improved fault prediction algorithm based on Elman feedback artificial neural network promoted the characteristics of the approximate any nonlinear function with arbitrary precision. Referencing to historical data by the feedback for the health management of multiequipment, the algorithm provided early detection, isolation, management and forecast for fault omen, incipient fault status and ancillary component failure state in multi-equipment health management. The self adaptive abilities and the robustness of fault prediction system are improved effectively. © 2013 by IFSA.

关键词： Self organizing maps

来源：评论

学校读者我要写书评

暂无评论

Numerical analysis of flow fields and temperature distribution of supersonic inflatable aerodynamic decelerators

引用

Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of technology 2013年第SUPPL.2期33卷 15-18页

作者： Ji, Xiu-Ling Sun, Shuai Hao, Shu-Wen National Key Laboratory of Science and Technology on Electro-Mechanical Dynamic Control Beijing Institute of Technology Beijing 100081 China

A computational study performed for a tension cone inflatable aerodynamic decelerator (TC-IAD) with different long bases was described in this paper. Flow field and temperature distribution were investigated. The calculated axial force coefficients were validated against the wind tunnel experimental results at Mach number from 1.65 to 4.50, and were found to be in excellent agreement. The simulation results also show that the length of base has some influence on shock structure and temperature distribution. At the angle of attack (α) from 0° to 15°, the TC-IAD protects the short base from severe aero-heating.

关键词： Flow fields

来源：评论

学校读者我要写书评

暂无评论

Analysis of Light Scattering Properties about Dent Nanoparticles upon Wafer

Analysis of Light Scattering Properties about Dent Nanoparti...

引用

2013 International Conference on Intelligent Materials and Mechatronics(IMM 2013)

作者： Lei Gong Honglu Hou Jinlong Zou Science and Technology on Electromechanical Dynamic Control Laboratory School of Photoelectric Engineering Xi’an Technological University

The light scattering properties of the dent nanoparticles upon wafers is discussed in this paper. Taking the advantage of the Bobbert-Vlieger(BV) theorem, the scattering model between wafer and dent nanoparticles is established. The scattering process is analyzed and the scattering coefficients are derived by using of the vector spherical harmonic function. The differential scattering cross section(DSCS) of the dent nanoparticles upon the wafer is calculated which is compared with the extended Mie method proved the validity of the method and the influences of the dent position, dent scale and scattering angle on the DSCS are analyzed numerically in details. The result is shown that the effect of the dielectric is smaller than the metal. Therefore, the material of the defect and the shape can be extracted by calculate the DSCS, which provide strong theoretical foundation to the nondestructive detector engineer.

关键词： Scattering properties BV theory Dent nanoparticles Wafer

来源：评论

学校读者我要写书评

暂无评论

Realization to extend the orientation estimation range of moving target on the ground by a single vector sensor

引用

Telkomnika - Indonesian Journal of Electrical Engineering 2013年第12期11卷 7773-7779页

作者： Song, Xiaopeng Liu, Hong Zhang, Cong Zhang, Guojun Xue, Chenyang Key Laboratory of Instrument Science and Dynamic Testing Ministry of Education North University of China Taiyuan 030051 China North Automatic Control Technology Institute Taiyuan 030006 China

The DOA (direction of arrival) estimation of seismic signals from the moving target on the ground bears great significance for unattended ground systems. The traditional DOA estimation of seismic signals is achieved by a sensor array and its corresponding algorithms. MEMS (Micro-Electro- Mechanical Systems) vector vibration sensor, however, gets the vector information over the propagation of seismic signals and therefore can get a DOA estimation within a certain range through a single vector sensor. This paper proposes a new method to extend the orientation range through the rotation of the MEMS vector vibration axis. The experiment shows that this method shares the merits with simple systematic structure, high sensitivity and less than 5 degrees of error on average, which has an extensive wide application prospect. © 2013 Universitas Ahmad Dahlan.

关键词： Direction of arrival

来源：评论

学校读者我要写书评

暂无评论

Feature extraction of gear-localized defect using adaptive lifting scheme and local gradient maps

引用

Engineering sciences 2013年第1期11卷 78-82,88页

作者： Zhang Lu Zhao Hong Li Zhen Qi Keyu Li Zongyao Yao Nianling State Key Lab oratory for Manufacturing Systems Engineering Xi'an Jiaotong University Tiandi (Changzhou) Automation Co. Ltd. Science and Technology on Electromechanical Dynamic Control Laboratory The Fourth Military Medical University Xijing Hospital

In this paper,the adaptive lifting scheme (ALS) and local gradient maps (LGM) are proposed to isolate the transient feature components from the gearbox vibration signals. Based on entropy minimization rule,the ALS is employed to change properties of an initial wavelet and design adaptive wavelet. Then LGM is applied to characterize the transient feature components in detail signal of decomposition results using ALS. In the present studies, the orthogonal Daubechies 4 (Db 4) wavelet is used as the initial wavelet. The proposed method is applied to both simulated signals and vibration signals acquired from a gearbox for periodic impulses detection. The two conventional methods (cepstrum analysis and Hilbert envelope analysis) and the orthogonal Db4 wavelet are also used to analyze the same signals for comparison. The results demonstrate that the proposed method is more effective in extracting transient components from noisy signals.

关键词： adaptive lifting scheme local gradient maps gearbox fault detection

来源：评论

学校读者我要写书评

暂无评论

Path-loss modeling for on-body UWB and off-body WiMax combined-channel

Path-loss modeling for on-body UWB and off-body WiMax combin...

引用

IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)

作者： Qihao Xu Anmin Gao Hongli Peng Jinlong Zou Key Lab of Ministry of Education for Research of Design and EMC High Speed Electronic Systems Shanghai Jiao Tong University Shanghai China Science and Technology on Electromechanical Dynamic Control Laboratory Xian China

An on- and off- combined body channel path loss (PL) model, along with its link realistic antennas effects, is developed in this paper. Based on a heterogeneous human body phantom and the verified antenna structures, the PL parameters of this model are extracted through the SEMCAD simulated results. This PL model is finally verified experimentally on a volunteer body.

关键词： Biomedical measurement Antenna measurements WiMAX Ultra wideband antennas Position measurement

来源：评论

学校读者我要写书评

暂无评论

MEMS slide block locking mechanism based on elastic supporting structure

MEMS slide block locking mechanism based on elastic supporti...

引用

2012 2nd International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2012

作者： Chenyang, Fan Xiaojie, Li Falin, Wang Science and Technology on Electromechanical Dynamic Control Laboratory xi'an 702265 China

ISBN: (纸本)9781467345897

Aiming at the condition that when the Fuze MEMS (micro electro mechanical system) S&A system bears setback/centrifugal overload in an experiment, the clamping head of a setback/centrifugal slide block deforms considerably when entering the clamping seat of a base plate, so that the slide block cannot be locked successfully by the clamping seat of the base plate, this paper presents an MEMS slide block locking mechanism with an elastic supporting structure. The structure of the mechanism, which is contrary to the original structure, is that rigid barbs are arranged on the clamping head, and an elastic supporting arm is arranged on the base plate. The finite element simulation with ANSYS shows that when the clamping head and the clamping arm of the locking mechanism with the elastic supporting structure bear overload, the stress of the dangerous cross-section of the locking mechanism is reduced by 52%, compared with that of the original mechanism, so that plastic deformation is avoided, and the slide block can enter the clamping seat smoothly and locked. Therefore, it can provide selection and reference for the design of locking mechanisms of MEMS S&A system in future. © 2012 IEEE.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

technology of in situ charge promotes the development of MEMS safety and arming device

Technology of in situ charge promotes the development of MEM...

引用

2012 2nd International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2012

作者： Jinlong, Zou Xiaojie, Li Yaru, Lei Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China Xi'An Institute of Electromechanical Information Technology Xi'an China

ISBN: (纸本)9781467345897

Based on the reading and the analyzing of relative literatures, this paper introduced basic concepts and fabrication processes of two in situ charge technologies - porous silicon energetic material and converting porous metal to primary explosive based on silicon process, and analyzed the structures and working principles of the micro-donators with two in situ charge technologies. This paper also introduced latest process of explosive train of the MEMS S&A. On these bases, the structure and working principle of silicon MEMS S&A proposed by US army was discussed, and this MEMS S&A is based on in situ charge and suitable for wafer-level mass fabrication. Some views about the development of the silicon MEMS S&A were also put forward. © 2012 IEEE.

关键词： Explosives

来源：评论

学校读者我要写书评

暂无评论

Design and simulation of high frame frequency CMOS camera image acquisition system

Design and simulation of high frame frequency CMOS camera im...

引用

International Conference on Automatic control and Artificial Intelligence, ACAI 2012

作者： Wei, Wang Nan, Chen Liming, Sun Ying, Guo Science and Technology on Electromechanical Dynamic Control Laboratory Xi'An Institute of Electromechanical Information Technology Xi'an710065 China School of Optoelectronic Engineering Xi'An Technological University Xi'an 710032 China

ISBN: (纸本)9781849195379

For the requirement of high frame in supervision and control for instruments in compartment and record of missiles lunching outside the compartment of a fighter, a high frame CMOS image acquisition system based on the FPGA is designed. High speed CMOS image sensor LUPA-300 is used in this system. Xilinx's FPGA is used as timing and readout of the image sensor and image transmission controlling. FIFO generated by FPGA using Verilog HDL (Hardware Description Language) achieves high-speed image data buffering. Camera Link interface is used to communicate with the image acquisition card of the host computer. The Experiments of the system show the frame can reach 249.6 fps in a format of 640*480 with the clock of 80 MHz.

关键词： Field programmable gate arrays (FPGA)

来源：评论

学校读者我要写书评

暂无评论

A photodiode signal conditioning circuit for projectile velocity measurement

A photodiode signal conditioning circuit for projectile velo...

引用

International Conference on Automatic control and Artificial Intelligence, ACAI 2012

作者： Wang, Wei Qu, Kai Zhang, Xiongxing Guo, Ying Science and Technology on Electromechanical Dynamic Control Laboratory Xi'An Institute of Electromechanical Information Technology Xi'an710065 China School of Optoelectronic Engineering Xi'An Technological University Xi'an 710032 China

ISBN: (纸本)9781849195379

In order to keep photodiode signal conditioning circuit could response to the very short pulse when projectiles cross the light mesh, the bandwidth of conditioning circuit should be increased and noise should be avoided. The key influencing factors on the bandwidth limit are analysed, and two optimization methods have been put forward at the same time. In the end, several experimental verification experiments are made to verify the two optimization methods which are put forward previously. The experimental results demonstrate that the former optimization method still could not be applied into the signal conditioning circuit, and the latter could improve the performance.

关键词： Projectiles

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：