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Wang G.,Beijing Institute of Technology | Li P.,Industries Development Corporation | Zhou J.,Beijing Institute of Technology
International Journal of Computational Intelligence and Applications

A dual-stage sampling (DSS) is proposed to reduce training samples of artificial neural network for establishing the analytical response surface model. The procedure of the DSS-based artificial neural network response surface (ANNRS) methodology is divided into two stages. At the rough stage, new sample is generated in the entire space by maximizing the minimum distance to existed samples. Then at the refine stage, new sample is produced in the same way, but is limited in the partial space between two samples with larger gradient and larger distance. And the efficiency of the DSS method is proved by a test function. Considering design variables about slot width and depth, permanent magnet (PM) width and height, and end tooth width, tubular permanent-magnet linear synchronous motor (TPMLSM) modeling problem is represented, whose thrust and ripple are calculated time-consumingly by finite element analysis. Then, The DSS-based ANNRS is applied to establish the TPMLSM model in good accuracy with fewer samples, lower consumption. © Imperial College Press. Source

Zhao Y.,Industries Development Corporation | Chen C.,Nanjing University of Science and Technology | Ma W.,Nanjing University of Science and Technology | Zhu Z.,Nanjing University of Science and Technology
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology

This paper presents a microstrip patch antenna with reconfigurable frequency and pattern to meet the needs of wireless communication system miniaturization and antenna multifunction. The configuration consists of a radiation patch with an U-shaped slot and two symmetrical parasitic patches. The reconfigurations of frequency and pattern can be achieved by changing the operating states of the PIN diode on the U-shaped slot and parasitic patches. Simulation and test results show that the antenna resonates at 5.2 GHz or 5.8 GHz, at the same time, the beam deflection and broadening can be achieved at both of the resonant frequencies. The reconfigurable frequencies and radiation patterns can be achieved by adopting the structure of a microstrip antenna, and the characteristic of multifunction is realized. ©, 2015, Nanjing University of Science and Technology. All right reserved. Source

Shimada H.,Industries Development Corporation | Shabana A.A.,University of Illinois at Chicago
Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics

This article is concerned with the numerical and experimental investigations of impact-induced vibrations in highly non-linear complex multibody system applications. In order to accurately model the impact response of such complex systems, a computational procedure based on the integration of finite element and multibody system algorithms is used. This procedure, which employs the finite element floating frame of reference formulation, allows for defining arbitrary joint constraint and forcing functions, for accurately capturing the coupling between the rigid body motion and the elastic deformation, and for modeling the impact forces between rigid and flexible bodies in the multibody system model. The system equations of motion are developed using the augmented Lagrangian formulation that allows for the use of sparse matrix techniques. The algorithm used in this study ensures that the kinematic constraint equations are satisfied at the position, velocity, and acceleration levels. The impact-induced vibration of a highly non-linear press machine is numerically and experimentally examined in this study. In order to accurately model the dynamic behavior of such a press machine, it is necessary to model the transfer feeder elastic deformations resulting from the impulsive impact forces. The deformations of the transfer press system as well as those of its frame are modeled in this investigation using the floating frame of reference formulation that allows for effectively reducing the number of degrees of freedom by filtering out very high-frequency modes of vibration using component mode synthesis techniques. The formulations of several relative angle and angular velocity kinematic constraints that are required to model this multibody system are developed in order to model transfer feeder complex rotational components. The numerical results obtained using the three-dimensional multibody system transfer press model developed in this study are validated using experimental results. © Authors 2011. Source

D'Souza L.,University of Illinois at Chicago | D'Souza L.,Industries Development Corporation | Barnes S.,University of Illinois at Chicago | Regalbuto J.R.,University of Illinois at Chicago | Regalbuto J.R.,University of South Carolina

Pd/C and CoPd/C heterogeneous catalysts have been synthesized by adopting Charge Enhanced Dry Impregnation (CEDI). The particles size distribution, their high metal surface-to-bulk ratios, and synthesis feasibility are unmatchable to any known noble metal bimetallic heterogeneous catalyst preparation techniques. Next generation Fuel Cells and Fischer-Tropsch catalytic processes economy will be benefited from the proposed methodology. © 2016 by the authors; licensee MDPI, Basel, Switzerland. Source

Mei Y.,Beijing Institute of Technology | Yu J.,Beijing Institute of Technology | Chen X.,Industries Development Corporation
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

It is of important practical value to track moving objects in the fields of industrial process control, medical research, imaging guidance, etc. At present most research in this field are often based on static background, while those based on moving background are rather less. A complete algorithm of object tracking in the moving background was proposed. Firstly, the background of sequence images were registered by using the mutual information. Secondly, a differential method was used to detect moving object in combination with image segmentation technology to get the object template. Object tracking was based on Kalman filter and the object matching was still based on the mutual information theory. The experiments show that object tracking is rapid, accurate and robust by using this algorithm. Computational efficiency and accuracy of this new tracking algorithm is so high, and its application prospect will be broad. Source

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