中国科学院机构知识库网格系统: 检索

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	Flame Dynamics in the Combustion Chamber of Hybrid Rocket Using Multiangle Chemiluminescence 期刊论文 OAI收割 JOURNAL OF PROPULSION AND POWER, 2023 作者: Luo JX(罗家枭); Zhang ZL(张泽林); Lin X(林鑫); Wang ZZ(王泽众); Wu K(吴坤) \| 收藏 \| 浏览/下载：23/0 \| 提交时间：2023/04/20 Combustion Instability Rayleigh Scattering Precombustion Chamber Hybrid Propellant Rocket Hybrid Rocket Motor Mass Flow Rate Convective Heat Transfer Characteristic Velocity Planar Laser Induced Fluorescence Propulsion and Power
	Investigation of flow hydrodynamics and regime transition in a gas-solids fluidized bed with different riser diameters 期刊论文 OAI收割 Chemical Engineering Science, 2014, 卷号: 116, 期号: *, 页码: 195-207 作者: Qiu GZ(邱桂芝); Ye JM(叶佳敏); Wang HG(王海刚); Yang WQ(杨五强) 收藏 \| 浏览/下载：23/0 \| 提交时间：2016/02/26 Flow regime Electrical capacitance tomography Differential pressure Solids volume fraction Bubble characteristic Transition velocity
	A simple lumped mass model to describe velocity of granular flows in a large flume 期刊论文 OAI收割 JOURNAL OF MOUNTAIN SCIENCE, 2012, 卷号: 9, 期号: 2, 页码: 221-231 作者: Yang Qingqing; Cai Fei; Ugai, Keizo; Su Zhiman; Huang Runqiu 收藏 \| 浏览/下载：26/0 \| 提交时间：2013/04/15 Granular flow Large-scale flume test Mass-front velocity Deposit characteristic
	Three-loop autopilot design and simulation (EI CONFERENCE) 会议论文 OAI收割 2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China 作者: Zhang Y. 收藏 \| 浏览/下载：44/0 \| 提交时间：2013/03/25 In order to realize missile real-time change flight trajectory three-loop autopilot is setting up. The structure characteristics autopilot model and control parameters design method were researched. Firstly this paper introduced the 11th order three-loop autopilot model. With the principle of systems reduce model order the 5th order model was deduced. On that basis open-loop frequency characteristic and closed-loop frequency characteristic were analyzed. The variables of velocity ratio dynamic pressure ratio and elevator efficiency ratio were leading to correct system nonlinear. And then autopilot gains design method were induced. System flight simulations were done and result shows that autopilot gains played a good job in the flight trajectory autopilot satisfied the flight index. 2012 IEEE.
	A real-time two-dimensional correlation speed measurement based on image (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 作者: Yu L. 收藏 \| 浏览/下载：22/0 \| 提交时间：2013/03/25 In order to implement two-dimensional moving object's non-contact and real-time speed measurement in this paper wc proposed a new method which was based on the characteristic of FPGA and a real-time two-dimensional correlation speed measurement was proposed on image processing using high speed CMOS shown in figure 1. Experimental installation was shown in figure 2 a cardboard with images which was fixed in electric control movement device was moving to simulate moving object the CMOS image sensor gathered image signals of the cardboard and the image signals was output to FPGA after a serials pretreatment such as binaryzation etc. Logical operation insteaded mathematical operation on FPGA to implement two frames image's cross-correlation operations as the formula (10) in this paper and finally calculate the two-dimensional velocity. Through experiment result of table 1 we drawn an conclusion the accurarcy of the method in this paper was less than 1 pixel and the method can be used at a certain speed ranges of two-dimensional real-time speed measurement. 2010 IEEE.
	Random noise filtering technology of piezoelectricity gyro (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 Qingjun L.; Yongming Y. 收藏 \| 浏览/下载：34/0 \| 提交时间：2013/03/25 Inertia sensing elements are usually adopted as the sensors of velocity stabilization loop in airborne photoelectric equipments therefore we need to adopt filtering processing to reduce influence to control system. In this paper which are constituted stabilized control system we analyze the characteristic of noise gyro drift that purpose is reducing the influence of the movement of carrier to visual axis of photoelectric probing system. But gyro and utilize Kalman filtering technology to conduct filtering processing to output signal of gyro especially the piezoelectricity gyro generates drift this method can reduce output noise effectively. The simulation results show that the proposed filtering processing method can improve the low velocity characteristic. 2010 IEEE. which is the main error source of photoelectric stabilized control system
	Detecting of multi-target in sea or sky background based on wavelet energy (EI CONFERENCE) 会议论文 OAI收割 Advanced Sensor Systems and Applications II, November 8, 2004 - November 12, 2004, Beijing, China 作者: Liu G. 收藏 \| 浏览/下载：17/0 \| 提交时间：2013/03/25 The technology of multi-target tracking is always detecting small targets in complex background. According to the frequency characteristic of nature background and small target a method of detecting targets based on wavelet energy is suggested. The energy of targets in horizontal and vertical direction outclass that of background or we can say the gray degree of targets outclass that of background. Then through selecting adaptive region-value targets and background can be divided. By the method of classifying the figure centers of every target can be calculated. According to the figure centers of every target in several neighboring frames the position and velocity of every target in next frame can be estimated by Kalman filter. Experiment results have shown that small targets in sea or sky nature background can be detected by this method and they can be tracking.