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| 1 | System construction of a four-side primary permanent-magnet linear motor drive mechanical press显示文摘A primary permanent-magnet linear motor (PPMLM) has a robust secondary structure and high force density and is appropriate for direct-drive mechanical press. The structure of a four-side PPMLM drive press is presented based on our previous research. The entire press control system is constructed to realize various flexible forming processes. The control system scheme is determined in accordance with the mathematical model of PPMLM, and active disturbance rejection control is implemented in the servo controller. Field-circuit coupling simulation is applied to estimate the system’s performance. Then, a press prototype with 6 kN nominal force is fabricated, and the hardware platform of the control system is constructed for experimental study. Punch strokes with 0.06 m displacement are implemented at trapezoidal speeds of 0.1 and 0.2 m/s;the dynamic position tracking errors are less than 0.45 and 0.82 mm, respectively. Afterward, continuous reciprocating strokes are performed, and the positioning errors at the bottom dead center are less than 0.015 mm. Complex pulse trajectories are also achieved. The proposed PPMLM drive press exhibits a fast dynamic response and favorable tracking precision and is suitable for various forming processes. | Jintao LIANG Zhengfeng MING Peida LI | 2020 | Frontiers of Mechanical Engineering2020，15，4： | 3 |
| 2 | Resolving the problem of cross sensitivity in fiber Bragg grating sensor based on the principle of polarized-light interference显示文摘The article introduces an advanced approach of fiber grating strain demodulation based on the principle of polarized-light interference.This method can solve the problem of cross sensitivity in fiber Bragg grating sensor.As for the yttrium vanadate(YVO4)crystal polarized-light interferometer,if there are two different fiber Bragg gratings that have a p rad phase difference,one is used for strain sensor and the other is used for temperature compensating.Then the problem of cross sensitivity can be overcome.The analyses of the strain demodulation resolution show that with a decrease in crystal thickness the resolution increases.The experiment shows that when the thickness of YVO_(4) crystal is 0.5 mm,the effect of cross-sensitivity will be reduced to 0.13μe/°C,which is 1.6%of the effect used by only one fiber Bragg grating for strain measure.And when the thickness is 0.1 mm the cross-sensitivity will be reduced to 0.0067μe/°C,which is less than 0.08%.Less thickness of crystal is beneficial for the resolution of strain measure,but the machining of small thickness crystal is difficult.To solve this problem,a new scheme of polarized-light interferometer with the structure of double layer crystal was analyzed. | LI Wei ZHANG Xiaopin ZHANG Min YE Peida | 2007 | Frontiers of Electrical and Electronic Engineering in China2007，2，2： | 0 |
| 3 | New Structure for Multi-Channel Demultiplexing显示文摘NewStructureforMultiChannelDemultiplexingLiBing,ShiZanandYePeida(OpticalCommunicationLaboratory,BeijingUniversityofPostsandT... | Li Bing, Shi Zan and Ye Peida (Optical Communication Laboratory, Beijing University of Posts and Telecommunications, Beijing 100088, P. R.China) | 1997 | The Journal of China Universities of Posts and Telecommunications1997，4，1： | 0 |
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