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Numerical analysis of flow fields and temperature distribution of supersonic inflatable aerodynamic decelerators

Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of technology 2013年第SUPPL.2期33卷 15-18页

作者： Ji, Xiu-Ling Sun, Shuai Hao, Shu-Wen National Key Laboratory of Science and Technology on Electro-Mechanical Dynamic Control Beijing Institute of Technology Beijing 100081 China

A computational study performed for a tension cone inflatable aerodynamic decelerator (TC-IAD) with different long bases was described in this paper. Flow field and temperature distribution were investigated. The calculated axial force coefficients were validated against the wind tunnel experimental results at Mach number from 1.65 to 4.50, and were found to be in excellent agreement. The simulation results also show that the length of base has some influence on shock structure and temperature distribution. At the angle of attack (α) from 0° to 15°, the TC-IAD protects the short base from severe aero-heating.

关键词： Flow fields

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A photodiode signal conditioning circuit for projectile velocity measurement

A photodiode signal conditioning circuit for projectile velo...

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International Conference on Automatic control and Artificial Intelligence, ACAI 2012

作者： Wang, Wei Qu, Kai Zhang, Xiongxing Guo, Ying Science and Technology on Electromechanical Dynamic Control Laboratory Xi'An Institute of Electromechanical Information Technology Xi'an710065 China School of Optoelectronic Engineering Xi'An Technological University Xi'an 710032 China

ISBN: (纸本)9781849195379

In order to keep photodiode signal conditioning circuit could response to the very short pulse when projectiles cross the light mesh, the bandwidth of conditioning circuit should be increased and noise should be avoided. The key influencing factors on the bandwidth limit are analysed, and two optimization methods have been put forward at the same time. In the end, several experimental verification experiments are made to verify the two optimization methods which are put forward previously. The experimental results demonstrate that the former optimization method still could not be applied into the signal conditioning circuit, and the latter could improve the performance.

关键词： Projectiles

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A radar ECCM method based on orthogonal pulse block and two-dimensional frequency domain motion compensation

A radar ECCM method based on orthogonal pulse block and two-...

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IET International Conference on Radar Systems, Radar 2012

作者： Xia, Lei Liu, Nan Zhao, Shanshan Zhang, Linrang Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Shaanxi 710065 China National Key Lab of Radar Signal Processing Xidian University Xi'an Shaanxi 710071 China

ISBN: (纸本)9781849196765

A radar ECCM method is proposed to combat the repeat jamming. Benfitting from the full-rate orthogonal pulse block design of such method, all the received signals within a pulse block are employed in the match filtering operation for false target cancellation, which improves the SNR of real targets. And the Two-dimensional frequency domain motion compensation automatically removes the impact of target motion on canceling out multiple false targets with different and unknown motion parameters. The numerical examples demonstrate the effectiveness of the proposed method.

关键词： Frequency domain analysis

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Virtual Force Feedback-based 3D Master/Slave Tele-nanomanipulation in SEM

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Journal of Nano Research 2012年 20卷 109-116页

作者： Li, Dongjie Rong, Weibin Sun, Lining Xiao, Wanzhe Zou, Yu State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150001 China Institute of Electromechanical Control and Automation Technology Harbin University of Science and Technology Harbin 150080 China

In this paper, we focus on the need for real time nanomanipulation, a 3D Master/Slave tele-nanomanipulation platform is studied with the haptic device (Omega3) as the master and the nanopositioner (Attocube) as the slave, working in scanning electron microscope (SEM). The 3D manipulation environment is developed with the help of VR technology. The platform is controlled by the enhanced virtual coupling (EVC) algorithm. The stability of the platform is discussed with Llewellyn's stability criteria. Scale factors and enhancement factor of the control system are determined, according to the force applied on master and slave terminals. Performances of the platform are tested with the ZnO nanowire manipulation experiments. Experiment results show that the platform has good performance while guaranteeing stability on ZnO nanowires manipulation in SEM using the method presented in this paper. © (2012) Trans Tech Publications, Switzerland.

关键词： Stability criteria

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Effect of various geometric parameters of inertial component on performance of accelerometer

Effect of various geometric parameters of inertial component...

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16th International Conference on Mechatronics technology, ICMT 2012

作者： Zhang, Jian-Hong National Key Laboratory of Science and Technology on Electromechanical Dynamical Control Beijing Institute of Technology Beijing China

ISBN: (纸本)9787900769428

A inertial component of MEMS piezoresistive accelerometer was taken as the research object to investigate the influence which caused by changing of geometry parameters of its micro elastic beam to system performance. The mechanical model was built to analyze the characteristics of max stress and displacement of the inertial component when the system was sensitive to external accelery load. The theory analysis was verified by the result of FEM simulation, and the effect on structural sensitivity and natural frequency of the inertial component with changing of geometry parameters of its micro elastic beams was studied based on the conclusions above. The conclusion could be used to conduct optimization the structure design of piezoresistive accelerometer.

关键词： Accelerometers

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Observer-based H∞ control of networked control systems with random communication delays for output measurements

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ICIC Express Letters, Part B: Applications 2013年第2期4卷 427-433页

作者： Yang, Yuanhua Wei, Li Liu, Guitao School of Control Science and Engineering Shandong University No. 73 Jingshi Road Jinan 250061 China School of Electromechanical Automobile Engineering Yantai University No. 32 Qingquan Road Laishan District Yantai 264005 China Key Laboratory of Advanced Manufacturing and Control Technology in Universities of Shandong Yantai University No. 32 Qingquan Road Laishan District Yantai 264005 China

The observer-based H∞ control problem for discrete-time networked systems where the output measurements are subject to random time delays is considered in this paper. With the proposed measurement model, an observer-based controller is designed by solving linear matrix inequality, which guarantees the exponentially mean-square stability of the closed-loop system and satisfies the prescribed H∞ performance. A simulation example is given to illustrate the effectiveness of the proposed method. © 2013 ICIC International.

关键词： Networked control systems

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Response of sensitive device of piozoresistive accelerometer to load

Response of sensitive device of piozoresistive accelerometer...

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2012 International Conference on Mechatronic Systems and Automation Systems, MSAS 2012

作者： Zhang, Jianhong National Key Laboratory of Science and Technology on Electromechanical Dynamical Control Beijing Institude of Technology Beijing 10081 China

ISBN: (纸本)9783037854921

The sensitive characteristics of sensitive device which was closely related to the mechanical properties of its micro elastic cantilever play a role in analysing the performance of piezoresistive accelerometer. To make a research on the response of the system to load, the deformation model of micro elastic cantilever of sensitive device belongs to piezoresistive accelerometer was built based on the method of system identification in this article to analyze their mechanical properties under static external load, the deformation equation was deduced and the quasi-dynamic deformation model of micro cantilever was obtained according to the principle that displacement was directly proportional to load. The conclusion could be used for evaluating the dynamic behavior of structure on virtual operation which would provide reference for optimization design of micro structures. © (2012) Trans Tech Publications, Switzerland.

关键词： Deformation

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The circuit-level simulation of continuous Wave Doppler Fuze detector based on ADS

The circuit-level simulation of continuous Wave Doppler Fuze...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Xiaoyu Gou Hong Su Tie Li Liang Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China NO.2 Satellite R&D Center Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781467317993

Simulation of fuze detector using conventional simulation softwares requires tremendous complicated theoretical calculations. It also can't analyze the impact caused by the nonlinear of the analog devices. A circuit-level simulation method is proposed in this paper to solve this problem, based on the implementation of continuous wave Doppler fuze detector on ADS simulation platform. Continuous Wave Doppler Fuze detector model is built on the ADS platform by using components and Microstrip Line as the same as real circuit and optimizing the analog components parameters by impedance matching. This model launches a Continuous wave signal which has the frequency between 3.36GHz and 3.5GHz, and generates an IF signal of a magnitude between 150mv to 200mv. The results show that this scheme is reasonable and feasible.

关键词： Integrated circuit modeling Detectors Doppler effect Mixers Analytical models Local oscillators

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Radio Fuse Echo CEM Model Based on PO-MoM Algorithm

Radio Fuse Echo CEM Model Based on PO-MoM Algorithm

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International Symposium on Antennas Propagation and EM Theory

作者： Bo Tian Dong Cui Yu Yu Tie Li NO.3 R & D department Science and Technology on Electromechanical Dynamic Control Laboratory

ISBN: (纸本)9781467317993

For the difficulty and low efficiency in calculating the radio fuze echo of complex target with traditional method, the PO-MOM Hybrid computation methodology is introduced to the traditional radio near-field fuze echo computing model. The established model can approximately calculate and quickly access target near-field equivalent RCS with the PO-MOM hybrid algorithm. When combined with the radar equation, the engineering CEM model of target terminal ballistics radio fuze echo signal can be achieved. The result of model validation shows that: the model has a high calculating speed, and the error is less than 25%, so this model can be used in quick simulation of radio fuze echo signal.

关键词： Echoes Radio Model checking Fuses

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Laser scattering polarization characteristics of mist and painted target based on rotation angle

Laser scattering polarization characteristics of mist and pa...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Dong Cui Wei Wang Wei Li Wei Yan NO.3 R & D department Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781467317993

For the absence of laser polarization characteristics data, which can be used to distinguish between mist and painted metal target, then we have taken a test methods based on rotation angle of polarization of the incident laser, and measured the degree of linear polarization of thin mist and tanker samples, experimental result says: within the scope of the polarization angle of 45°, laser backscattering polarization characteristics have the ability to distinguish between mist and painted metal target samples. In order to verify this phenomenon, we changed frequency and pulse width parameters of the incident laser, then measured middle and high concentrations mist and painted armored vehicle samples. The verification results show that: under different frequency and pulse width of incident laser, with increasing the angle of incident laser polarization, the degree of laser backscattering polarization of mist decrease first and then increase, the minimum value of polarization show in 45°. But the degree of polarization of painted metal target samples do not change significantly, which are greater than middle and high concentration mist in the angle of 45°.

关键词： Measurement by laser beam Frequency measurement Vehicles Laser transitions Coatings Backscatter

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