中国科学院机构知识库网格系统: 检索

Band-pass filtering analysis on low-frequency tonal noise generated from a Krueger storage cavity 期刊论文 OAI收割
AEROSPACE SCIENCE AND TECHNOLOGY, 2022, 卷号: 128, 页码: 9
作者: Lu WS(陆维爽); Liu, Peiqing; Guo, Hao

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收藏 | 浏览/下载：31/0 | 提交时间：2022/12/20

Krueger flap Storage cavity Aero-acoustic Noise characteristics Band-pass filtering

Effect of the trailing-edge flap on tones due to self-excited oscillation within the leading-edge slat cove 期刊论文 OAI收割
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING, 2022
作者: Lu WS(陆维爽); Liu, Peiqing; Guo, Hao

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收藏 | 浏览/下载：31/0 | 提交时间：2022/10/23

high-lift device leading-edge slat aerodynamic noise acoustic characteristics trailing-edge flap

Self-Noise Spectrum Analysis and Joint Noise Filtering for the Sea-Wing Underwater Glider Based on Experimental Data 期刊论文 OAI收割
IEEE Access, 2020, 卷号: 8, 页码: 42960-42970
作者: Sun J(孙洁); Wang J(王瑾); Shi, Yang; Hu F(胡峰); Wang X(王旭)

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收藏 | 浏览/下载：61/0 | 提交时间：2020/04/11

Underwater glider noise filtering self-noise characteristics hydrodynamic flow noise mechanical noise experimental data processing

Noise characteristics analysis of short wave infrared InGaAs focal plane arrays 期刊论文 OAI收割
INFRARED PHYSICS & TECHNOLOGY, 2017, 卷号: 85, 页码: 74-80
作者: Yu CL; Li X; Yang B; Huang SL; Shao XM

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收藏 | 浏览/下载：29/0 | 提交时间：2018/11/20

InGaAs FPAs Noise characteristics Capacitance of detectors

Effect of the Uneven Circumferential Blade Space on the Performance of Small Axial Flow Fan 期刊论文 OAI收割
2016
作者: Liu, Y., Lin, Z., Lin, P. F., Jin, Y. Z., Setoguchi, T. and Kim, H. D.

收藏 | 浏览/下载：33/0 | 提交时间：2017/05/27

small axial flow fan uneven circumferential blade space static characteristics discrete noise broadband noise noise-reduction modulation rotor

The application of adaptive enhancement algorithm based on gray entropy in mammary gland CR image (EI CONFERENCE) 会议论文 OAI收割
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012, April 21, 2012 - April 23, 2012, Three Gorges, China
Zhang M.-H.; Zhang Y.-Y.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

Mammary gland is composed entirely of soft tissue with approximate density therefore mammary gland CR medicine radiation image presents a low contrast and slight difference changes may be a manifestation of tumor so it is necessary to enhance mammary gland CR image to improve its visual quality in order to meet the demands of doctor's clinical diagnosis. However the general enhancement algorithms over enhance the contrast and noise due to image details lost aiming at the defects a mammary gland CR medicine image adaptive enhancement arithmetic based on image gray entropy is put forward. The arithmetic adapts dizzy image to magnify selected spatial frequency response in order to enhance the edge details of mammary gland CR images. It can adjust weighted factor K according to image gray characteristics namely pixel gray entropy. Experiments results demonstrate that mammary gland CR image enhanced by the algorithm has abundant details and high signal-to-noise ratio moreover CR image enhanced has good visual effect. So the method is effective and fit for enhancing CR medical radiation image edge details. 2012 IEEE.

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：52/0 | 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.

Optical signal noise ratio increased by multiplexing algorithm for QSFP+ module (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Industrial Control and Electronics Engineering, ICICEE 2012, August 23, 2012 - August 25, 2012, Xi'an, China
Yu H.-C.; Zheng X.-F.; Cheng P.; Yu W.-J.

收藏 | 浏览/下载：43/0 | 提交时间：2013/03/25

In order to increase OSNR (Optical Signal Noise Ratio Secondly Thirdly OSNR) of QSFP+ module the realization steps of the multiplexing algorithm is provided this algorithm is applied in QSFP+ module and the corresponding circuit of host board is designed and the experimental result shows that multiplexing algorithm is able to increase OSNR 2 dB. 2012 IEEE. a multiplexing algorithm is proposed. Firstly the development of optical module and the characteristics of QSFP+ module are illustrated

The research on statistical properties of TDI-CCD imaging noise (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
Gu Y.-Y.; Shen X.-H.; He G.-X.

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

TDI-CCD can improve the sensitivity of space camera without any degradation of spatial resolution which is widely used in aerospace imaging devices. The article describes the basic working principle and application characteristics of TDI-CCD devices analyses the composition of TDI-CCD imaging noise and propose a new method to analyze TDI-CCD imaging noise with statistical probability distribution. In order to estimate the distribution of gray values affect by noise we introduced the concept of skewness and kurtosis. We design an experiment using constant illumination light source take image with TDI-CCD working at different stage such as stage 16 stage 32 stage 48 stage 64 and stage 96 analyse the characteristics of image noise with the method we proposed experimental results show that the gray values approximately meet normal distribution in large sample cases. 2011 SPIE.

Analyse the angular velocity estimation errors of -- filter based on high sampling rate (EI CONFERENCE) 会议论文 OAI收割
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
作者: Zhang Y.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

In order to get angular velocity of stabilization servo mechanism from angular position sensors -- filter based on high sampling rate was established model and error characteristics were analyzed. With the hypothesis of constant acceleration -- filter and its angular velocity transfer function were deduced. Combing with optimum parameters the effects of and sample rate on the error characteristics were evaluated. According to the requirements of stabilization servo mechanism the frequency characteristics of angular velocity transfer function are analyzed and the filter parameters are designed. The experimental which filter tracked and smoothed sinusoidal signal the results show that when the cutoff frequency of angular velocity loop is 44.9rad/s sampling period and parameters are 0.08ms and 0.01279 respectively the phase leading of angular position is 70. -- filter tracked sinusoidal signals with maximum angular velocity(30/s) and maximum angular acceleration(30/s2) the error of angular velocity estimation was 0.053/s. In the engineering of electro-optical stabilization servo mechanism -- filter can reduce noise effectively and reached the requirement of platform angular velocity estimation. Also it is one of the effective methods to get angular velocity from angular position sensors. 2011 IEEE.