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35 results on '"Zhu, Limin"'

5. Introduction

Author

Pang, Huan, primary, Cao, Xiaoyu, additional, Zhu, Limin, additional, and Zheng, Mingbo, additional

Published
2020
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13. Conclusion

Author

Pang, Huan, primary, Cao, Xiaoyu, additional, Zhu, Limin, additional, and Zheng, Mingbo, additional

Published
2020
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32. An Algorithm to Generate Compact Dual NURBS Tool Path with Equal Distance for 5-Axis NC Machining.

Author

Bi, Qingzhen, Wang, Yuhan, Zhu, Limin, and Ding, Han

Abstract

A new algorithm is proposed to generate compact dual NURBS tool paths with equal distance (DNTPED) for 5-axis NC machining. The DNTPED has significant advantages over conventional linear tool path in the NC machining of free-form surface since it reduces the tangency discontinuities along the tool path. The discontinuities, the inherent character of the linear interpolation, are the important sources of practical feed-speed fluctuation of the machine tool. The new algorithm is proposed to generate DNTPED based on the theories of rational motion. Here the rational rigid movement of a cutter is represented by a B-spline curve in dual quaternion space. DNTPED is obtained directly from the B-spline dual quaternion curve with the help of the blossom form of the B-spline curve. Comparing with the existing method, the DNTPED consists of less data and each NURBS can be treated as one curve, not as a collection of bézier segments. [ABSTRACT FROM AUTHOR]

Published
2010
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33. Hysteresis Modeling of Piezoelectric Actuators Using the Fuzzy System.

Author

Li, Pengzhi, Gu, Guoying, Lai, Leijie, and Zhu, Limin

Abstract

An approach of hysteresis modeling in piezoelectric actuators is presented based on the multi-input single-output (MISO) fuzzy system. The proposed model adopts first-order Takagi-Sugeno (T-S) fuzzy system and transforms the multi-valued hysteresis into a one-to-one mapping with the extended input space vector. The generated fuzzy subspaces (multi-dimensional fuzzy sets) assign the maximum membership degree to the input data vectors. Fewer fuzzy subspaces are obtained by introducing the nearest neighbor and super radius concepts. The consequent parameter optimization is implemented after training the fuzzy system. Experimental results demonstrate that this methodology is algorithmically easy and can achieve high modeling accuracy. [ABSTRACT FROM AUTHOR]

Published
2010
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34. Station Point Optimization of Total Station in Shield Tunneling Method Based on Set-Covering.

Author

Li, Bolan, Zhang, Xu, and Zhu, Limin

Abstract

This paper proposed a method for station point optimization of the total station of automatic guidance system in shield tunneling, which is not analyzed widely at present. In this paper, station point optimization is converted into a set-covering problem. In order to express the measurability of the active target station for the total station, a 0-1 measurability matrix is introduced, and each element in the matrix represents a measurability judgment, which includes the visibility test, the distance test, and the incidence angle test. Then, the greedy algorithm is used to find the approximate optimal solution of this set-covering problem. Furthermore, an application example affirmed that our method was effective. [ABSTRACT FROM AUTHOR]

Published
2010
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35. Robust Calibration of a Color Structured Light System Using Color Correction.

Author

Zhang, Xu and Zhu, Limin

Abstract

In this paper, a new method for calibration of the structured light system is presented. Three code words, i.e. red green and blue squares, are used to create the M-array pattern image. Then the color calibration is conducted to deal with the color crosstalk. The color correction can make the decoding process more robust. After that, the camera is calibrated and the 3D corresponding points are also computed using the calibrated camera. Finally, the projector calibration is carried out. The experiment results on our structured light system show that our method is correct and precise. [ABSTRACT FROM AUTHOR]

Published
2009
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