-
The Reseach on Model Predictive Control for Linear Synchronous Motor of Maglev Train
Li Yelei,
Xu Hongze,
Gegerile
Issue:
Volume 5, Issue 2, April 2017
Pages:
77-85
Received:
20 April 2017
Accepted:
Published:
20 April 2017
Abstract: The PID controller with an advantage of simple structure and easy extension is difficult to meet the requirements of the speed control system during the parameters variation and load disturbance. This paper presents a model predictive control(MPC) strategy for motor speed control based on analysis of the mathematical model of long stator linear synchronous motor(LSLSM), which utilizes move-blocking strategy to reduce the degrees of freedom of the controller by fixing the system input to keep it constant over several time. Then a low-computation MPC controller is designed for the sake of controller implementation in practice. Finally, the simulation experiments are conducted to verify the effectiveness of the proposed controller by using Matlab. Results show that the MPC controller effectively improved the dynamic performance and steady state accuracy of the system and the low-computation MPC reduced the computational complexity with a decline in accuracy.
Abstract: The PID controller with an advantage of simple structure and easy extension is difficult to meet the requirements of the speed control system during the parameters variation and load disturbance. This paper presents a model predictive control(MPC) strategy for motor speed control based on analysis of the mathematical model of long stator linear syn...
Show More
-
Research on a New Type of Composite Islanding Detection Method
Wang Hao,
An Yuan,
Wang Songkai,
Ding Hang
Issue:
Volume 5, Issue 2, April 2017
Pages:
86-93
Received:
20 April 2017
Accepted:
Published:
20 April 2017
Abstract: Distributed photovoltaic (PV) grid failure occurs, the short circuit fault current is small, and the power flow is bidirectional, the traditional power grid relay protection method is no longer applicable. In this article, through the study of traditional active frequency drift islanding detection method (AFD), analyses its advantages and disadvantages and applicable occasions, a new type of composite island detection method is proposed, the method based on adaptive islanding detection method accelerated frequency shift (AAFD), by introducing the common coupling point voltage frequency in a direction of continuous change number n, piecewise adaptively adjust frequency positive feedback coefficient, accelerate the limit of the frequency deviation, if the number of change if more than a dozen times, are not the limit of the frequency, the constant 2 cycle of negative pulse current amplitude power frequency interference, trigger under-voltage protection, so as to detect the island.this method can reduce the grid harmonic distortion rate, improve the response time of the island detection. At last, through Matlab simulation to verify.
Abstract: Distributed photovoltaic (PV) grid failure occurs, the short circuit fault current is small, and the power flow is bidirectional, the traditional power grid relay protection method is no longer applicable. In this article, through the study of traditional active frequency drift islanding detection method (AFD), analyses its advantages and disadvant...
Show More
-
Research on the Overall Function Framework Scheme of the Intelligent Connected Vehicle
Issue:
Volume 5, Issue 2, April 2017
Pages:
94-99
Received:
20 April 2017
Accepted:
Published:
20 April 2017
Abstract: The Intelligent connected vehicle is car which is able to access the Internet, smart devices, other vehicles, and the road infrastructure. In the meantime, the intelligent connected vehicle can collect real-time data from multiple sources, and play a fundamental role in the future of the Internet of things. In the background of increasingly fierce competition in the industry, a large number of car manufacturers, software developers and hardware developers are doing their best to provide the best solution for the Intelligent connected vehicles. The Intelligent connected vehicles are expected to liberate drivers from tense and heavy driving operation, and to provide them with driving AIDS and entertainment functions. It is discussed in this paper that the possibility of the intelligent connected vehicle and relevant issues, and the hardware, and software solutions, their main characteristics are listed.
Abstract: The Intelligent connected vehicle is car which is able to access the Internet, smart devices, other vehicles, and the road infrastructure. In the meantime, the intelligent connected vehicle can collect real-time data from multiple sources, and play a fundamental role in the future of the Internet of things. In the background of increasingly fierce ...
Show More
-
Research on Video Saliency Detection Via Contrast and Self-Adaptive Transfer
Wang Yongguang,
Hao Aimin,
Li Shuai
Issue:
Volume 5, Issue 2, April 2017
Pages:
100-107
Received:
20 April 2017
Accepted:
Published:
20 April 2017
Abstract: Although a lot of studies in salient motion detection have achieved great success in recent years, many challenges still exist toward the video saliency detection over the non-stationary videos and videos with slowly-moving objects, which supposes to exhibit significant influence on its corresponding subsequent applications. Thus, it urgently needs a more robust, stable, and precise method to solve the above mentioned limitations. In fact, inspired from the basic visualization rule of the human vision system, the human’s attention can be easily attracted by two independent factors: the motion saliency clue and the color saliency clue. Hence, this paper develops a novel salient motion detection method by fusing the motion saliency with the color saliency, which refines the preliminary saliency map by self-adaptive transfer via the newly designed intra-frame correlation. Also, comprehensive experimental results of our method toward the state-of-the-art methods over 4 public available benchmarks demonstrate the superiority of our method both in its robustness and high detection precision.
Abstract: Although a lot of studies in salient motion detection have achieved great success in recent years, many challenges still exist toward the video saliency detection over the non-stationary videos and videos with slowly-moving objects, which supposes to exhibit significant influence on its corresponding subsequent applications. Thus, it urgently needs...
Show More
-
Research on Keyframe Animation Generation Method of Elastic Body Based on Inverse Finite Element Optimization Analysis
Hao Aimin,
Lan Yu,
Li Shuai,
Yang Chen
Issue:
Volume 5, Issue 2, April 2017
Pages:
108-117
Received:
20 April 2017
Accepted:
Published:
20 April 2017
Abstract: This paper proposes a keyframe animation method of elasitc body based on inverse Finite Element Method (FEM) analysis, which constructs a multi-objective optimization process and makes a space-time optimization analysis on the keyframes in deformation space to reconstruct a user-specified deformation space of target model. By introducing signed distance field, we translate user-specified keyframe shapes into implicit surfaces, which makes our method suitable for various data format. We define an objective function measuring the distance from displacement field to implicit surface, and meanwhile introduce inverse FEM into iterative optimization process to obtain optimal control force field and model material parameter. And all experimental results show the validity of our method in accuracy and efficiency.
Abstract: This paper proposes a keyframe animation method of elasitc body based on inverse Finite Element Method (FEM) analysis, which constructs a multi-objective optimization process and makes a space-time optimization analysis on the keyframes in deformation space to reconstruct a user-specified deformation space of target model. By introducing signed dis...
Show More
-
A Study of Time-varying Seismic Wavelet and Reflection Coefficient Separation Method Based on EMD and Smooth Filtering
Lu Zi-hao,
Dai Yong-shou,
Gao Xu,
Zhang Peng,
Tan Yong-cheng,
Zhang Hong-qian
Issue:
Volume 5, Issue 2, April 2017
Pages:
118-128
Received:
20 April 2017
Accepted:
Published:
20 April 2017
Abstract: The accuracy of seismic wavelet extraction influences the accuracy of analysis and dealing for seismic data directly. In fact, the wavelet in seismic data has the characteristics of time-varying. There are many methods for wavelet extraction, but the results using existing methods are not satisfying. This paper studies a new method for the separation of seismic wavelet and reflection coefficient from seismic data using Empirical Mode Decomposition (EMD) which have the superiorities of adaptive decomposition and multi-scale analysis. Firstly, we cut the seismic data into different segmentations and regard each segmentation as stationary signals while combining the characteristics of wavelet and reflection coefficient based on the hypothesis of stationarity. Then, we do preprocessing which is an important step. After preprocessing, Mirror extension inhibit the endpoint effect. Finally, using EMD decomposes the logarithmic amplitude spectrum of each segmentation and selecting different Intrinsic Mode Functions (IMF) which are smooth and continuous restructures the wavelet. The simulation results show that this method can implement the separation of seismic wavelet and reflection coefficient precisely. This paper lay a foundation for later high-precision extraction of seismic wavelet.
Abstract: The accuracy of seismic wavelet extraction influences the accuracy of analysis and dealing for seismic data directly. In fact, the wavelet in seismic data has the characteristics of time-varying. There are many methods for wavelet extraction, but the results using existing methods are not satisfying. This paper studies a new method for the separati...
Show More
-
Research on Distributed Wireless Network Capacity and Its Seepage Transmission Method
Issue:
Volume 5, Issue 2, April 2017
Pages:
129-134
Received:
20 April 2017
Accepted:
Published:
20 April 2017
Abstract: Based on the background of green communication, the modeling and system capacity of distributed large-scale wireless networks have been deeply studied. We studied the robust rule of routing, capacity limit analysis, modeling of large-scale wireless network. and the system capacity. In detail, we focus on the modeling and connecting characteristics of large scale wireless network under the environment of dynamic link changes. Further, we analyze the existing capacity under the condition of multiuser interference and attenuation factors based on percolation theory. Finally, we propose the percolation routing and transmission method network based on the capacity limit of end-to-end wireless network system.
Abstract: Based on the background of green communication, the modeling and system capacity of distributed large-scale wireless networks have been deeply studied. We studied the robust rule of routing, capacity limit analysis, modeling of large-scale wireless network. and the system capacity. In detail, we focus on the modeling and connecting characteristics ...
Show More
-
Research on Automatic Skinning of Articulated Characters Using Extended Position Based Dynamic
Issue:
Volume 5, Issue 2, April 2017
Pages:
135-143
Received:
4 May 2017
Accepted:
Published:
4 May 2017
Abstract: This paper proposes automatic skinning using extended position based dynamic in character animation, which adds energy conservation constraints based on the easy expandability of the position based dynamics. In the skeletal motion process, the deformation of surface mesh is divided into two stages. First stage: at each frame, the skeleton moves and both the surface and volumetric vertices are deformed by a standard LBS algorithm. Second stage: we use position based dynamics to update both the tetrahedral mesh and surface mesh automatically by solving the constraints. Lastly, self-collision and Laplacian smoothing are used to refine the deformation locally and output the result. In order to verify the feasibility and effectiveness of the mentioned algorithm, this paper experiment with different models and obtain the desired results.
Abstract: This paper proposes automatic skinning using extended position based dynamic in character animation, which adds energy conservation constraints based on the easy expandability of the position based dynamics. In the skeletal motion process, the deformation of surface mesh is divided into two stages. First stage: at each frame, the skeleton moves and...
Show More
-
Comparative Study on Mode-Selection and Tuning Principle of Several Birefringent Filters
Issue:
Volume 5, Issue 2, April 2017
Pages:
144-150
Received:
4 May 2017
Accepted:
Published:
4 May 2017
Abstract: Bireftingent filters play an important role in many fields such as laser technology, etc. This paper describes the mode-selection and tuning principle of several sets of new birefringent filters. Including PBS-HWP combination, PBS-QW combination, PBS-LN crystal combination and PBS-QWPs combination. The advantages and disadvantages of these bireftingent filters are analyzed, mainly about the convenience and laser structure, which are in good agreement with experiment results.
Abstract: Bireftingent filters play an important role in many fields such as laser technology, etc. This paper describes the mode-selection and tuning principle of several sets of new birefringent filters. Including PBS-HWP combination, PBS-QW combination, PBS-LN crystal combination and PBS-QWPs combination. The advantages and disadvantages of these bireftin...
Show More
-
Research and Realization of a Medium Power Wireless Power Transmission System
Xiao Peng Li,
Xue Qing Yuan,
Kai Lin Xu
Issue:
Volume 5, Issue 2, April 2017
Pages:
151-156
Received:
10 May 2017
Accepted:
Published:
11 May 2017
Abstract: In order to solve the inconvenience of pluggable power transmission, this paper attempts to design a non-contact transmission energy system.In this paper, the system device is divided into transmitter and receiver, and the study designed a special mechanical structure to solve the problem of coil offset. The computer simulation and practical experiments get the transmitting and receiving coils at different distances in the transmission power and efficiency, and the optimal transmission distance between the transmitting and receiving coils is obtained. Through a large number of related experiments done in the air, the experimental results further validate the accuracy of the simulation theory. When the inverter input voltage is 100V and the system frequency is 98.7kHz, the system transmission power up to 613W, which can provide a scientific theoretical basis and reference for further underwater wireless power transmission experiment.
Abstract: In order to solve the inconvenience of pluggable power transmission, this paper attempts to design a non-contact transmission energy system.In this paper, the system device is divided into transmitter and receiver, and the study designed a special mechanical structure to solve the problem of coil offset. The computer simulation and practical experi...
Show More
-
Research on the Internet of Things Across the Road of the Stereo Garage Design
Hou Lun Yuan,
Yang Guangming
Issue:
Volume 5, Issue 2, April 2017
Pages:
157-163
Received:
10 May 2017
Accepted:
Published:
11 May 2017
Abstract: The purpose of this paper is to design a cross road networking intelligent stereo garage, can make full use of the space above the existing roads, improve space utilization, and equipped with a networking intelligent management system, through the intelligent car parked car stop system can realize the intelligent and automatic process, timely release of information through dynamic parking the Internet, efficient and convenient to improve the vehicle owner to stop taking, for garage managers can improve the management efficiency, reduce management costs, effectively guarantee the safety of vehicles. How to solve the parking problem in the limited space effectively, especially the parking problem in large cities, is of great significance to maintain the normal operation of urban traffic system and promote the development of urban economy.
Abstract: The purpose of this paper is to design a cross road networking intelligent stereo garage, can make full use of the space above the existing roads, improve space utilization, and equipped with a networking intelligent management system, through the intelligent car parked car stop system can realize the intelligent and automatic process, timely relea...
Show More
