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Cai T.,Anhui Electrical Engineering Professional Technique College | Dai Q.,Hefei University | Wang J.,Hefei University
Chinese Control Conference, CCC | Year: 2012

The estimation-base modular design was applied for the adaptive tracking problems for a class of stochastic nonlinear in the form of parametric-strict- feedback driven by Wiener noises of unknown covariance. We achieve a complete controller-identifier separation by employing Lyapunov function and using the ISS controller with strong parametric robustness properties. For the noise of unknown covariance, we apply the adaptive design. According to the passive theorems, a passive identifier module is designed to guarantee the boundedness of the state error. Therefore, the result that the tracking error converges to a small residual set in probability was obtained. © 2012 Chinese Assoc of Automati.


Cai T.,Anhui Electrical Engineering Professional Technique College | Wang J.,Hefei University | Sun Q.,Hefei University
Chinese Control Conference, CCC | Year: 2012

The estimation-base modular design was applied for the adaptive tracking problems for a class of stochastic nonlinear in the form of parametric-strict- feedback driven by Wiener noises of unknown covariance. We achieve a complete controller-identifier separation by employing Lyapunov function and using the ISS controller with strong parametric robustness properties. According to the Swapping technique, filters were designed to convert dynamic parametric models into static models. In view of unknown covariance, we choose generalized Least-Square algorithms and give the generalized Least-Square update laws, then discuss the estimate of the covariance. © 2012 Chinese Assoc of Automati.


Li R.-J.,Hefei University of Technology | Li R.-J.,Anhui Electrical Engineering Professional Technique College | Fan K.-C.,Hefei University of Technology | Fan K.-C.,National Taiwan University | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

The measurement of miniature components with a micro- or nano-coordinate measuring machine requires a high precision contact scanning probe. The elastic mechanism of low stiffness is a major component of the contact scanning probe. A new elastic mechanism is analyzed by the theory of elasticity and finite element analysis in this paper. It is to realize the probe's mechanical behavior and stiffness when designing an elastic mechanism for a contact scanning probe. The contact scanning probe is composed of a tungsten stylus with a ruby ball tip, a mechanism of floating plate suspended by four V-shaped leaf springs, and a 3D optical sensor. The leaf spring experiences elastic deformation when a contact force is applied. Uniform stiffness model is analyzed. Simulation and experimental results verify the correctness of the analysis. © 2013 SPIE.


Li R.-J.,Hefei University of Technology | Li R.-J.,Anhui Electrical Engineering Professional Technique College | Fan K.-C.,Hefei University of Technology | Fan K.-C.,National Taiwan University | And 4 more authors.
Precision Engineering | Year: 2016

This paper presents a long-stroke contact scanning probe with high precision and low stiffness for micro/nano coordinate measuring machines (micro/nano CMMs). The displacements of the probe tip in 3D are detected by two plane mirrors supported by an elastic mechanism, which is comprised of a tungsten stylus, a floating plate and two orthogonal Z-shaped leaf springs fixed to the outer case. A Michelson interferometer is used to detect the vertical displacement of the mirror mounted on the center of the floating plate. An autocollimator based two dimensional angle sensor is used to detect the tilt of the other plane mirror located at the end of the arm of the floating plate. The stiffness and the dynamic properties are investigated by simulation. The optimal structural parameters of the probe are obtained based on the force-motion model and the constrained conditions of stiffness, measurement range and horizontal size. The results of the performance tests show that the probe has a contact force gradient within 0.5 mN/μm, a measuring range of (±20 μm), (±20 μm), and 20 μm, respectively, in X, Y and Z directions, and a measurement standard deviation of 30 nm. The feasibility of the probe has preliminarily been verified by testing the curved surface of a convex lens. © 2015 Elsevier Inc. All rights reserved.


Li R.-J.,Hefei University of Technology | Li R.-J.,Anhui Electrical Engineering Professional Technique College | Fan K.-C.,Hefei University of Technology | Fan K.-C.,National Taiwan University | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

A new high precision analogue contact probe with long measurement range that is able to measure miniature components on a micro/nano-coordinate measuring machine (CMM) is proposed. This analogue probe is composed of a fiber stylus with a ball tip, a mechanism with a wire-suspended floating plate, a two-dimensional angle sensor and a miniature Michelson linear interferometer. The stylus is attached to the floating plate. The wires experience elastic deformation when a contact force is applied and then the mirrors mounted on the plate will be displaced, which displacements can be detected by two corresponding sensors. Each component of the probe is designed, fabricated and assembled in this research. Base on the design requirements and stiffness analysis of the probe, several constrained conditions are established, and optimal structure parameters of the probe are worked out. Simulation and experimental results show that the probe can achieve uniform stiffness, ±20μm measurement range and 1nm resolution in X, Y and Z directions. The contact force is less than 50μN when the ball tip is displaced by 20μm. It can be used as a contact and scanning probe on a Micro/Nano-CMM. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).


Cheng L.,State Grid Corporation of China | Cheng L.,Anhui Electrical Engineering Professional Technique College | Wang X.B.,Anhui Electrical Engineering Professional Technique College | Wang X.T.,Anhui Electrical Engineering Professional Technique College
Environment, Energy and Applied Technology - Proceedings of the 2014 3rd International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2014 | Year: 2015

This paper introduces the application condition and advantages of single-phase distribution transformer in Low Voltage Urban Power Network. With the brief analysis to the structure of singlephase distribution transformer and the way of power supply of the single-phase distribution system, this paper points out the attentions in the application of single-phase distribution transformer in the Low Voltage Urban Power Network, and puts forward the proposal that in the construction and reconstruction of the Low Voltage Urban Power Network, the way of power supply which combining single-phase and three-phase distribution transformer should be formed with the consideration of the real situation. © 2015 Taylor & Francis Group, London.


Zhang Y.,Anhui Science and Technology University | Xing H.,Anhui Science and Technology University | Zou H.,Anhui Science and Technology University | Zhao S.,Anhui Science and Technology University | Wang X.,Anhui Electrical Engineering Professional Technique College
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

The three-way decisions model divides the universe into three regions, i.e., positive region (POS), boundary region (BND) and negative region (NEG) according to two thresholds. A challenge of the three-way decisions model is how to compute the thresholds that generally rely on the experience of experts. In this paper, we propose a novel three-way decisions model based on Constructive Covering Algorithm(CCA). The new model produces three regions automatically according to the samples and does not need any given parameters. We give a method for constructing coverings from which the three regions are formed. We can classify samples based on the three regions. The experimental results show that the proposed model has great advantage on the classification efficiency and provides a new method to form three regions automatically for the theory of three-way decisions. © 2013 Springer-Verlag.


Cheng Z.,Hefei University of Technology | Li M.,Anhui Electrical Engineering Professional Technique College
Proceedings of IEEE International Conference on Grey Systems and Intelligent Services, GSIS | Year: 2013

Med-long term load forecasting is the basis of power system planning. According to the characteristics and changing rules of the different types of electricity load and different demand side management strategies on them, electricity load structure forecasting for the research on power development and planning is very necessary. Based on the grey theory, this paper proposes a med-long term load structure forecasting model in which the system state equations and grey dynamic model group about various types of electricity load are established, in terms of the system dominant factors and associated factors determined by the grey correlative degree analysis method, and are solved to realize the med-long term structure forecasting of power consumption by means of the GM (1, N, x (0)) model derived from GM (1, N) model. The power consumption of actual grid is predicted in medium and long term in a case study utilizing the proposed model. The prediction results are analyzed and compared with the observed values of power consumption, which verifies the validity and practicality of the established med-long term load forecasting model. © 2013 IEEE.


Wang X.-T.,Anhui Electrical Engineering Professional Technique College | Wang X.-B.,Anhui Electrical Engineering Professional Technique College | Zhang H.-Z.,Anhui Electrical Engineering Professional Technique College
Applied Mechanics and Materials | Year: 2014

Electricity power companies have the obligation to provide qualified electrical energy to the power user, the same as electricity customers, the power company claims to provide qualified energy, electricity customers are obliged to choose the right appliances to minimize the impact on the power quality of the power system. Higher harmonics is an important indicator of the impact of power quality, household appliances majority of non-linear loads, the use of the process will produce high harmonics, although the power is not, but a huge number, pooled together, will still PQ great impact. Therefore, the measurement of electrical waveforms common household appliances, will harmonic analysis, harmonic control, or other harmonic study is instructive. © (2014) Trans Tech Publications, Switzerland.


Wang X.-B.,Anhui Electrical Engineering Professional Technique College | Wang X.-T.,Anhui Electrical Engineering Professional Technique College | Huang J.,Anhui Electrical Engineering Professional Technique College
Applied Mechanics and Materials | Year: 2014

With the improvement of people's living standards, a wide variety of home appliances gradually into the ordinary family. In these appliances, there are many various nonlinear loads, nonlinear loads generated in the process of using a large number of high harmonics, and sold on the market are mostly air switch 50Hz power under conditions of use in accordance with the design, which kinds of air switch is suitable for applications in which high harmonic supply. This article will explore this issue through theoretical research and testing methods. © (2014) Trans Tech Publications, Switzerland.

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