检索结果-内蒙古大学图书馆

International Conference on Electrical Machines and Systems (ICEMS)

作者： Jin Gao Shiyang Song Surong Huang College of Mechatronics Engineering and Automation Shanghai University China

ISBN: (纸本)9781479951635

Traditional modeling of permanent magnet synchronous motor (PMSM) based on FPGA does not take into account the generality of the model, thus it can not be applied to different types of motors. In this paper, a method of transforming motor models into per-unit values system is introduced, and the accuracy and time delay characteristics of the model are considered in the process of FPGA programming. The two types of potential energy load and resistance load are distinguished in the motor motion equation, which enables the model to run in four quadrants. Finally, the PMSM control system is established by connecting a dSPACE controller to the FPGA-based per-unit value model. Different types of motor parameters were tested; the experiment results were compared with the Simulink simulation results, which verify the versatility and reliability of per-unit value model.

关键词： Mathematical model Field programmable gate arrays Load modeling Permanent magnet motors Equations Real-time systems Accuracy

来源：评论

学校读者我要写书评

暂无评论

The Influence of MEMS on Electromagnetic NDT

The Influence of MEMS on Electromagnetic NDT

引用

2014 IEEE Far East Forum on Nondestructive Evaluation/Testing: New Technology & Application Increasingly perfect NDT/E

作者： Mengchun Pan Yunze He Ruifang Xie Weihong Zhou College of Mechatronics engineering and automation National University of Defense Technology

There are some challenges in Electromagnetic Nondestructive Testing(EM NDT)*** cracks are too small to find and evaluate at the *** components are hardly to *** volumetric sensor is difficult to be embedded in the *** solve these problems,Micro-ElectroMechanical Systems(MEMS)was presented to fabricate micro inductive coils as eddy current *** the help of rapid development of MEMS,a lot of merits are brought to EM sensors,like high spatial resolution,high sensitivity,be adapted to complex structure,flexible substrate,be easily embedded,and on-chip *** paper reviews the influences of MEMS on EM sensors and introduces some classical methodologies to fabricate and develop EM sensors.

关键词： electromangetic NDT eddy current MEMS inductive coil flexiable

来源：评论

学校读者我要写书评

暂无评论

A Visual Saliency Detection Algorithm Based on Channel Selecting in Transform Domains

A Visual Saliency Detection Algorithm Based on Channel Selec...

引用

第26届中国控制与决策会议

作者： Shen Yifeng Niu Yifeng Shen Lincheng College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781479937097

A transform domain algorithm using channel selecting is proposed for visual saliency in this paper. This algorithm is able to improve the accuracy of the traditional transform domain saliency detection while preserving their advantage of fast processing speed. Based on the image signature algorithm, we select the channels by calculating the correlation values between each channel. Then, the selected channels, instead of all of the channels, are combined for the final saliency map according to the corresponding combination rule which we designed. The experimental comparison between the proposed and original approaches demonstrates that our method is higher in accuracy while maintaining high processing speed.

关键词： Saliency Detection,Transform Domain,Image Signature,Channel Selecting

来源：评论

学校读者我要写书评

暂无评论

Outliers detection of cross-link ranging measurements between navigation satellites based on apriori dynamics information

Outliers detection of cross-link ranging measurements betwee...

引用

2014 International Conference on Remote Sensing and Smart City(RSSC2014)

作者： X.P.Zhong Y.T.Yang M.Fan W.D.Huang College of Mechatronics Engineering and Automation National University of Defence Technology

ISBN: (纸本)9781784660291

Valid cross-link ranging measurements are the fundament of the autonomous orbit determination and time synchronism, which is on the basis of cross-link ranging measurements, of navigation constellation. There may be outliers among the crosslink measurements, because of the complexity of the space environment. As the result, the accuracy of orbit determination and time synchronism would decline and even divergence in the case of failing to detection of the outliers before having been processed. This paper proposed an approach based on apriori information to detect the outliers. Firstly, the characteristics of cross link ranging measurements, which under constrains of orbit dynamics, were analyzed and addressed. With the dynamics information and characteristics of cross-link ranging measurement as the apriori information, the detection method of outliers was deduced, in which Kalman filtering algorithm were employed. Finally, an example of specified constellation and outliers was given to validate the approach proposal. The results show that the outliers can be detected efficiently using our approach.

关键词： cross-link ranging measurements apriori information outlierdetection orbit dynamics

来源：评论

学校读者我要写书评

暂无评论

An investigation into atmospheric corrosion detection under paint with K-band microwave NDT

An investigation into atmospheric corrosion detection under ...

引用

Far East Forum on Nondestructive Evaluation/Testing: New Technology & Application (FENDT)

作者： Hong Zhang Lin Xu Luxiong Xu Jusheng Wu Yunze He School of Electronic and Information Engineering Fuqing Branch of Fujian Normal University Fuqing China The Institute of Innovation Information Industry Fuqing Branch of Fujian Normal University Fuqing China Institute of Applied Electronic Technology Fuqing Branch of Fujian Normal University Fuqing China College of Mechatronics engineering and automation National University of Defense Technology Changsha P. R. China

ISBN: (纸本)9781467369992

Microwave based technique plays a vital role in non-destructive testing (NDT) field. A microwave based NDT method has been developed to detect and evaluate atmospheric corrosion under paint. The results are promising, the measurement sensitivity and resolution of microwave NDT can be significantly improved with known the lift-off (air layer) in the corrosion detection applications. The aim of this investigation was achieved by using electromagnetic computer simulation technology (CST 2012) describing the interaction of microwave signals radiated out of an open-ended rectangular waveguide with a layered medium. This CST program calculates the reflection coefficient (simulating corrosion measurements), and describes the field distribution in multiple layered media. Steel sample with 12 months exposure time has been measured. The experimental results were obtained by using a microwave NDT scanning system that was built according to the results of the theoretical investigation, and they confirmed the theoretical results.

关键词： Corrosion Paints Microwave measurement Reflection coefficient Steel K-band

来源：评论

学校读者我要写书评

暂无评论

The optimization of termination in combined technique of magnetorheological finishing and hf etching for laser-induced damage threshold high-efficiency improving of fused silica 10

The optimization of termination in combined technique of mag...

引用

10th CHINA-JAPAN International Conference on Ultra-Precision Machining Process, 10th CJUMP and 2014 International Conference on Surface Finishing Technology, ICSFT 2014

作者： Tian, Ye Peng, Xiao Qiang Dai, Yi Fan Shi, Feng Wan, Wen College of Mechatronics Engineering and Automation National University of Defense Technology China Húnan Key Laboratory of Ultra-precision Machining Technology National University of Defense Technology Changsha China

ISBN: (纸本)9783038352495

The developing high-power laser systems are requiring higher laser-induced damage threshold (LIDT) and fabrication efficiency of fused silica optical elements. To solve these problems, MRF polishing and HF etching have been combined utilized wiping and passivating structural defects as well as removing impurities. Furthermore, the LIDT improvement is dependent greatly on the corporation of processes. But the LIDT improving mechanism is partly ambiguous yet, that may lead to random or experimental parameter choice and ultimately generate unsatisfied results. Consequently, this paper focuses on the termination mechanism of the process. Atom Force Microscope (AFM) measurement, finite difference time-domain (FDTD) simulation and LIDT test will be utilized to analysis and validate the optimization theoretically and practically. Finally, in one side, the LIDT value of optimized-terminated sample is 16.7J/cm2, which is about the same level (even 3.7% higher) as that of the over-etched one. In another side, the etching process time could be shorted by 32% using the optimized method. © (2014) Trans Tech Publications, Switzerland.

关键词： Polishing

来源：评论

学校读者我要写书评

暂无评论

Real-time trajectory planning for UCAV air-to-surface attack using inverse dynamics optimization method and receding horizon control

引用

Chinese Journal of Aeronautics 2013年第4期26卷 1038-1056页

作者： Zhang Yu Chen Jing Shen Lincheng College of Mechatronics Engineering and Automation National University of Defense Technology

This paper presents a computationally efficient real-time trajectory planning framework for typical unmanned combat aerial vehicle （UCAV） performing autonomous air-to-surface （A/S） attack. It combines the benefits of inverse dynamics optimization method and receding horizon optimal control technique. Firstly, the ground attack trajectory planning problem is mathematically formulated as a receding horizon optimal control problem （RHC-OCP）. In particular, an approximate elliptic launch acceptable region （LAR） model is proposed to model the critical weapon delivery constraints. Secondly, a planning algorithm based on inverse dynamics optimization, which has high computational efficiency and good convergence properties, is developed to solve the RHCOCP in real-time. Thirdly, in order to improve robustness and adaptivity in a dynamic and uncer- tain environment, a two-degree-of-freedom （2-DOF） receding horizon control architecture is introduced and a regular real-time update strategy is proposed as well, and the real-time feedback can be achieved and the not-converged situations can be handled. Finally, numerical simulations demon- strate the efficiency of this framework, and the results also show that the presented technique is well suited for real-time implementation in dynamic and uncertain environment.

关键词： Air-to-surface attack Direct method Inverse dynamics Motion planning Real time control Receding horizon control Trajectory planning Unmanned combat aerial vehicles

来源：评论

学校读者我要写书评

暂无评论

Non-homogeneous disturbance observer-based second order sliding mode control

Non-homogeneous disturbance observer-based second order slid...

引用

Chinese Control Conference (CCC)

作者： Peng Li Peng Wang Jianjun Ma Xuefeng Peng College of Mechatronics Engineering and Automation National University of Defense Technology Changsha Hunan CN

A robust second order sliding mode control scheme for first order dynamic systems is proposed in the present paper. The controller has finite time convergent property and contains two parts. A part is fast power reaching law which is used to stabilize sliding variable and its derivative to zero in finite time without disturbance. The other part is a non-homogeneous disturbance observer, which can provide for exact estimation of the sufficiently smooth disturbance in finite time. As a result, a continuous second order sliding mode is established in finite time. Computer simulation confirms the theoretical results.

关键词： Robustness

来源：评论

学校读者我要写书评

暂无评论

Fast nonsingular integral terminal sliding mode control for nonlinear dynamical systems

Fast nonsingular integral terminal sliding mode control for ...

引用

IEEE Conference on Decision and Control

作者： Peng Li Jianjun Ma Zhiqiang Zheng Lina Geng College of Mechatronics Engineering and Automation National University of Defense Technology Changsha Hunan CN

This paper presents a fast nonsingular integral terminal sliding mode control (FNITSMC) for a class of nonlinear systems. First, a novel fast nonsingular integral terminal sliding mode surface (FNITSMS) is designed by introducing power integral terms which contain a boundary-like structure. Next, by employing FNITSMS and the equivalent control technique, the FNITSMC is proposed to achieve the finite-time convergence of the system states. Compared with many existing works on terminal sliding mode control (TSMC), the proposed FNITSMC exhibits three attractive features: (i) can avoid the singularity problem without any constraint, and provide faster responses by tuning the parameters in FNITSMS; (ii) for constant or eventually constant disturbances, zero steady-state error can be achieved when a boundary layer is used to alleviate chattering; (iii) the switching gain is only required to be designed greater than the bound of the disturbance. Finally, Simulation results of both the numerical and application examples show the effectiveness of the proposed control method.

关键词： Nonlinear systems Convergence Switches Vectors Steady-state Asymptotic stability Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

Optimal Tracking Performance of MIMO Networked Control Systems with Communication Constraints

Optimal Tracking Performance of MIMO Networked Control Syste...

引用

第26届中国控制与决策会议

作者： Chao-Yang Chen Ming Chi Zhi-Hong Guan Xian-He Zhang Xi-Sheng Zhan College of Automation Huazhong University of Science and Technology College of Mechatronics and Control Engineering Hubei Normal University

In this paper, we study the optimal tracking performance problem of continuous-time linear multi-input multi-output(MIMO) networked control systems. The unstable and non-minimum phase systems is considered. The output feedback path is subject to quantization noise, additive white Gaussian noise and bandwidth constraints, and encoding and decoding are considered. The reference input is a random signal. The performance is measured through the tracking error energy, and two-parameter controller is considered. The explicit expression of the tracking performance has been obtained. The results show that the unstable poles and non-minimum phase zeros of the plant, the channel noise,bandwidth, quantization noise and coder will aggravate the optimal tracking performance.

关键词： Tracking Performance,Channel Noise,Quantization Noise,Bandwidth Constraint

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：