中国科学院机构知识库网格系统: 检索

Analysis of effects of shellfish harvesting methods on digging shovel performance using the discrete element method 期刊论文 OAI收割
AQUACULTURAL ENGINEERING, 2026, 卷号: 112, 页码: 14
作者: Fu, Shancan; Zhang, Shaolei; Yang, Lei; Wu, Haiyun; Ding, Zhengliang

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收藏 | 浏览/下载：1/0 | 提交时间：2025/12/09

Digging force Forward speed Digging depth Discrete element simulation Harvesting rate

Elucidating the transfer dynamics of high-viscosity silver paste for laser-induced forward transfer of continuous line 期刊论文 OAI收割
OPTICS AND LASERS IN ENGINEERING, 2024, 卷号: 181, 页码: 12
作者: Zhang YM(张艳梅); He XL(何秀丽); Tian CX(田崇鑫); Yu YC(于玉翠); Shu Z(舒壮)

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收藏 | 浏览/下载：64/0 | 提交时间：2024/08/19

Laser-induced forward transfer(LIFT) High-viscosity paste Transfer dynamics High-speed imaging Continuous lines

A High-Output-Swing 64-Gb/s PAM-4 Transmitter with a 4-Tap Hybrid FFE in 28-nm CMOS 期刊论文 OAI收割
IEICE ELECTRONICS EXPRESS, 2024, 页码: 6
作者: Xu, Hua; Zheng, Xuqiang; Wang, Zedong; Cai, Chen; Zhen, Wenxiang

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收藏 | 浏览/下载：58/0 | 提交时间：2024/05/20

Baud-spaced de-emphasis BS-DE feed-forward equalizer FFe four level pulse amplitude modulation PAM-4 fractionally spaced pre emphassi FS-Pe high speed transmitter high swing

Design of high speed and parallel compression system used in the big area CCD of high frame frequency (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Precision Engineering and Non-Traditional Machining, PENTM 2011, December 9, 2011 - December 11, 2011, Xi'an, China
作者: Li G.-N.; Jin L.-X.; Zhang R.-F.; Wang W.-H.; Li G.-N.

收藏 | 浏览/下载：70/0 | 提交时间：2013/03/25

According to the area CCD camera of characteristics such as high resolution capacity and high frame frequency this paper puts forward a high speed and parallel image compression system of high integration degree. Firstly according to the work principle of the area CCD FPGA is adopted to realize the timing driving and multichannel and parallel analog signal handling to raise the export frame frequency of the area CCD. Secondly with an image compression scheme based on FPGA embedded processor MicroBlaze and ADV212 compression chip real time image compression and the high speed area CCD are realized. Finally by detecting the analog signal of the area CCD output the real time compression of the big area CCD image is carried out in different compression ratios and the compression performance is analyzed. Experiment result shows that this scheme can realize real time image compression with the biggest data rate of 520Mbps. When compression bit ratio is 0.15 the signal-to-noise ratio of peak value can reach 36 dB. Image collection and image compression are integrated which reduces the data transmission between them and improves systematic integration degree.

Compensation of moire fringe sinusoidal deviation in photoelectrical encoder based on tunable filter (EI CONFERENCE) 会议论文 OAI收割
2011 Symposium on Photonics and Optoelectronics, SOPO 2011, May 16, 2011 - May 18, 2011, Wuhan, China
作者: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：48/0 | 提交时间：2013/03/25

In order to improve the precision of the absolute photoelectrical encoder a compensating method is put forward which restrains the harmonics in moire fringe signal. After analyzing the relationship between the subdividing error and the sinusoidal index a low-pass digital filter which can make the moire signal satisfy the need of 1024 subdivision is designed. Considering with the fundamental frequency varies with the rotating speed of encoder the tunable filter is adopted whose cutoff frequency is calculated according to the coarse information of the encoder. The simulating results show that the proposed method can improve the sinusoidal index especially at high rotating speed. At last the compensating algorithm is implemented in the terminal of satellite optical communication which needs high resolution. The experimental results show indicate that the developed method is feasible. 2011 IEEE.

The Research of real time auto-recognition of the moire fringe (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wang M.-J.; Wu Z.-G.

收藏 | 浏览/下载：45/0 | 提交时间：2013/03/25

Measuring the movement of raster by the method of moire fringe has the advantage of high sensitivity high resolution and non-contacted measurement. The characteristic of moire fringe is that the image is white alternate with black the angle of the stripes is uniform the width of the stripes is uniform the terminators of the stripes aren't clear. A fast method that can figure out the width and angle of the moire fringe precisely is put forward in this paper. It calculates the angle the stripes firstly. According to the principle of the minimum mean squared error (MMSE) the closer a series of data is the smaller the value of the MMSE will be. The method is described as follows: It takes the image's center as the origin 180 beelines pass through the origin with the same angle interval. it calculates the value of the minimum mean squared error of the 180 beelines and find out the least one among those then the angle of the moire fringe comes out primarily. In order to improving the calculating precision of moire fringe 60 equal angles are divided in the neighborhood of the angle then a precise angle of moire fringe is calculated according to the principle of the MMSE. After getting out the angle of the moire fringe we begin to calculate the width of moire fringe. A line vertical with the moire fringe is drawn and we can get the width of the moire fringe by the vertical line. In order to get over the influence of the noise an effective area with the shape of diamond is selected in the image. The data of area is accumulated and projected according to the direction of moire fringe and a sine curve come out. The width of moire fringe can be obtained by getting the position of the first wave crest the position of the last wave crest and the number of wave crest. Experiments prove that the precision of the method put forward in this paper is enhanced in comparison with the traditional frequency method the precision of width calculation achieves to 99.6% according to the evaluation indicators of width detection error. The computing speed is boosted largely compared with traditional method and it can achieve with 15 ms that satisfying the demand of real time. 2011 SPIE.

Feed-forward control to stabilize optical axis based on accelerometer (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Wenfeng B.; Juan C.; Hu W.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

In the optoelectronic tracking system the azimuth and elevation system determine the pointing precision of the optical axis. We discuss how to stabilize the optical axis by apply the feed forward control based on the accelerometer output. Both the acceleration and speed are applied to the compound controller. The experimental results show that when the azimuth servo system works at maximum speed 50/s and maximum accelerate 30/s2 the maximum tracking error of the system is 1.08' with the feed forward compensation so the precision is increased 6 times compared to that of without compound control. 2010 IEEE.

Kalman filter for pointing deviation delay compensation in a TV tracker (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Juan C.; Wang Q.-P.; Jian C.

收藏 | 浏览/下载：38/0 | 提交时间：2013/03/25

Considering the pointing deviation delay in the TV tracker which heavily worsens the tracking precision here we offer an improved Kalman filter algorithm to compensate the delay. The output speed from the filter is fed forward to the speed loop for the compound control to increase the speed constant. The simulation results based on the experiment data show that the method can effectively estimate the position consequently the speed and accelerate and the tracking precision is improved. The estimation precision of the speed and accelerate depend on that if the state model is coherent with the movement of the real target. 2010 IEEE.

Aircraft orientation error correction based on image aided navigation paper (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
Tao Z.; Yang L.-M.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

In allusion to the character of aircraft orientation error in inertial navigation system increasing with its working time and error accumulation airborne image aided navigation system is imported in inertial navigation system to combine integrated navigation system. To acquire high orientation accuracy and high matching speed a new algorithm based on multi-scale edge detection and generalized point theory is put forward. At first multi-scale edge detection algorithm is adopted to realize airborne image edge detection then image matching algorithm is used based on generalized point theory is used to eliminate error accumulation of peg-top excursion and accelerometer error to correction aircraft aircraft pose error to increase navigation accuracy of aircraft. To prove the algorithm is effective and robust simulative experiment is done. The simulative experiment indicated that aircraft orientation accuracy is better than inertial navigation system and its orientation error is less than 15 meters after airborne image aided navigation correction. 2010 IEEE.

Graph fitting test method for the interpolation error of Moire fringe (EI CONFERENCE) 会议论文 OAI收割
9th International Conference on Electronic Measurement and Instruments, ICEMI 2009, August 16, 2009 - August 19, 2009, Beijing, China
作者: Sun Y.; Sun Y.

收藏 | 浏览/下载：69/0 | 提交时间：2013/03/25