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30th International Symposium on Ballistics, BALLISTICS 2017

作者： Li, Dong-Guang Shi, Yong-Hui Li, Ru-Peng Huo, Peng-Fei Beijing Institute of Technology Science and Technology on Electromechanically Dynamic Control Laboratory Beijing100081 China Xi'an Institute of Electro Mechanical Information Technology Xi'an710065 China

ISBN: (纸本)9781605954196

2D trajectory correction technology has been adopted to improve the accuracy of mortar. The fuze equipped with a trajectory correction canard is a method to achieve effectively 2D trajectory correction. The circular grid-fin has the characteristic of shorter length of fin cell, thereby the flowing choking is reduced effectively. The use of grid fin is well known for its smaller control moments resulting in smaller actuators, which can solve the problem of fuze space limitation. In addition, the circular layout allows it to be closed folded along the surface of the fuze, resulting in little influence on the aerodynamic characteristics of the trajectory correction mortar in the flight before correcting. The computational fluid dynamic (CFD) simulations are carried out to investigate the aerodynamic characteristics of trajectory correction mortar with planar canard and circular grid-fin canard respectively, in the condition of subsonic, transonic and supersonic. Lift coefficients, drag coefficients, lift/drag ration, pitch moment coefficients and center of pressure of trajectory correction mortar with circular grid-fin canard and planar canard are compared. The results indicate the circular grid-fin canard is a good configuration for 2D trajectory correction.

关键词： Mortar

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Research on the attack angle response of projectile considering the instantaneous and durable force induced by canards 30

Research on the attack angle response of projectile consider...

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30th International Symposium on Ballistics, BALLISTICS 2017

作者： Li, Dong-Guang Li, Ru-Peng Shi, Yong-Hui Huo, Peng-Fei Beijing Institute of Technology Science and Technology on Electromechanically Dynamic Control Laboratory Beijing100081 China Xi'an Institute of Electro Mechanical Information Technology Xi'an710065 China

ISBN: (纸本)9781605954196

The investigation in attack angle induced by canards control force is an important issue for trajectory correction technology. This paper focuses on the attack angle response of projectile considering not only durable force but instantaneous force. Following the introduction of the projectile nonlinear dynamic models in the non-rolling reference frame, the equations of attack angle under control are established. The initial angular rate is derived through a model with conservation of angular momentum. The analytical solutions of attack angle under the two conditions are presented. The analytical expression of the relationship between trajectory shift and attack angle is presented. When instantaneous force is taken into consideration, the magnitude of the maximum angle of attack is raised by 10.2%, the steady-state time is extended by 15.2%, whereas the trajectory under two kinds of condition varies little.

关键词： Projectiles

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Numerical investigation of influence of structure and operating parameters on performance of vortex oil filter

Numerical investigation of influence of structure and operat...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2018)

作者： Wang Ning Chen Weijian Ning Guoli Ma Hui Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics Nanjing P.R. China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing P.R. China

ISBN: (纸本)9781510872745

In this paper, the three-dimensional numerical simulation of solid-liquid two-phase flow in a vortex oil filter is performed by means of numerical simulation. The Reynolds stress turbulence model is used in the simulation flow field, and the DPM model is used for solid particle tracking. The influence of key structural parameters and operating parameters on the filtering effect was mainly studied, such as the inlet width, the size of the overflow pipe, the wall thickness and the insertion depth, the size of the cone angle and the length of the cone end. The results provide the basis for the rational design of the vortex oil filter.

关键词： Vortex oil filter Solid-liquid separation Turbulence model Numerical simulation

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Finite-time model-assisted active disturbance rejection control with a novel parameters optimizer for hypersonic reentry vehicle subject to multiple disturbances

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Aerospace science and technology 2018年 79卷 588-600页

作者： Yue Yu Honglun Wang Na Li Huiping Zhang Zikang Su Xingling Shao School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China Unmanned System Research Institute Beihang University Beijing 100191 China School of Automation Beijing Institute of Technology Beijing 100081 China Beijing Aerospace Automatic Control Institute Beijing 100854 China Key Laboratory of Instrumentation Science & Dynamic Measurement Ministry of Education North University of China Taiyuan 030051 China National Key Laboratory for Electronic Measurement Technology School of Instrument and Electronics North University of China Taiyuan 030051 China

In this paper, a scheme which combines finite-time model-assisted active disturbance rejection control and novel greedy criterion-based salp swarm algorithm is developed for attitude tracking problem of hypersonic reentry vehicle with multiple disturbances. To simplify control structure, the control scheme is designed within the framework of active disturbance rejection control completely. To lessen tuning parameters, a sigmoid function-based tracking differentiator is employed to generate a more realizable attitude transient profile instead of utilizing conventional nonlinear tracking differentiator. Taking known model information as model-assisted term, finite-time model-assisted extended state observers are constructed to estimate the lumped disturbance in attitude and angular rate loop with employment of function fal . To achieve rapid response and strong robustness, finite-time model-assisted control laws are derived by utilizing function fhan . Finally, a novel greedy criterion-based salp swarm algorithm is used to optimize control parameters in finite-time model-assisted control laws to achieve optimal solution that minimizes the tracking error and energy consumption. Comparative simulations are conducted to illustrate the effectiveness of the proposed scheme.

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Study on the performance of reinforced concrete blocks treated by styrene-acrylic emulsion

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Chemical Engineering Transactions 2018年 66卷 85-90页

作者： Zhu, Jing Zheng, Wenzhong Xie, Lili Wu, Yunqiang Zhang, Yongxin Fu, Junxiang Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration Harbin150080 China College of Civil Engineering and Architecture Harbin University of Science and Technology Harbin150080 China Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin150090 China

This paper introduces a method of improving the performance of reinforced concrete blocks and reveals the reinforcing effect of fibers. It is pointed out that the plant fibers treated by styrene-acrylic emulsion can effectively improve the interfacial bonding conditions, for the modified straw fibers which were treated by alkali processing and acrylic coating, their performance has been significantly improved, which is conducive to absorbing energy and improving the strength of the material. This paper focuses on introducing three types of reinforced concrete blocks, it’s known that the bridging effect can effectively prevent the development of micro cracks. The occurrence of cracks increases the macroscopic tensile strain of the material and increases the ductility and toughness of the matrix. Studying plant fiber reinforced blocks will help promote the application of this new wall materials. Copyright © 2018, AIDIC Servizi S.r.l.

关键词： Tensile strain

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Simulation study of the dynamic characteristics of the electromagnetic flame-proof mechanism

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Journal of Beijing Institute of technology 2016年第3期25卷 323-327页

作者： WANG Ya-bin JIA Jing-bo National Key Laboratory of Electromechanical Dynamic Control School of Mechatronical Engineering Beijing Institute of Technology Beijing 100081 China

Since the overloads of the electromagnetic flame-proof mechanism under different working conditions are complex and hard to be verified,a numerical simulation method of this mechanism working process is proposed with the combination of Adams and ***,a simulation model of electromagnetic flame-proof mechanism was established,which includes the safety pin,the spring,and the exciting coils and so ***,the model was imported to Adams taking constraints into consideration,which include the contacts,kinematic pairs and the *** co-simulation model was established through the union of Adams and *** model was tested via simulations,and the obtained results were analyzed *** results show that the method can simulate the dynamic process of the electromagnetic flame-proof mechanism during the service process and under the normal power supply condition,and therefore the motion displacements of the electromagnetic pin under different working conditions can be obtained through *** can verify the mechanism＇s designing rationality,thus laying the foundation for the physical prototype testing and reducing the repetition of the product＇s design process.

关键词： electromagnetic flame-proof mechanism co-simulation numerical simulation

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Compressible effect on the cavitating flow:A numeric study

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Journal of Hydrodynamics 2017年第6期29卷 1089-1092页

作者：张伟柏晓东马峥陈刚 Yong Wang Science and Technology on Water Jet Propulsion Laboratory Marine Design and Research Institute of ChinaShanghai 200011China Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of CivilEngineeringHarbin Institute of TechnologyHarbin 150090China China Ship Scientific Research Center Wuxi 214082China Max Planck Institute for Dynamics and Self-Organization Am Faflberg 17Gottingen 3 7077Germany

To understand the effect of the compressibility on the cavitating flow, a compressible, multiphase, single component Reynolds averaged Navier-Stokes（RANS） solver is used to study the cavitating flow on a wedge in the present work. A barotropic equation of status is used. A non-linear model for compressibility in the mixture is adopted to capture the effect of the compressibility within the complex cavitation bubbly mixtures. An unsteady cavitation phenomenon is found in the numerical simulation. The numerical results of local compressibility and Mach number in the bubbly mixture are given. The mechanism responsible for the unsteady shedding of the bubbly mixture is discussed based on the numerical results.

关键词： Cavitation compressibility barotropic flow

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Research on Output Characteristics Calculation Method of Micro-Magnetoelectric Generator

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Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of technology 2017年 37卷 198-201and206页

作者： Sui, Li Bian, Xin-Yuan Zhang, Li-Dan Su, Huai-Wei Shi, Geng-Chen Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing100081 China

The small-sized magnetoelectric generator has many advantages such as high power density, small axial size, long-term storage, and good prospects for fuze power supply. The output performance of the magnetoelectric generator is influenced by the coil parameters and the magnetic circuit structure, and it is difficult to get the analytical model. In order to analyze the output performance of magnetoelectric generator theoretically, the output voltage of the generator by method of combining analytical derivation and simulation analysis can be otained. The magnetoelectric generator were designed and machined according to the calculation results. The experimental results of the output performance of the magnetoelectric generator show that the error between the theoretical analysis and experimental results is only 0.2%, which proves the rationality of the calculation method proposed in the present paper. © 2017, Editorial Department of Transaction of Beijing Institute of technology. All right reserved.

关键词： Magnetos

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Gas Sensing: Scalable Superior Chemical Sensing Performance of Stretchable Ionotronic Skin via a π-Hole Receptor Effect (Adv. Mater. 13/2021)

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Advanced Materials 2021年第13期33卷

作者： Ming Liang Jin Sangsik Park Hyukmin Kweon Hyeong-Jun Koh Min Gao Chao Tang Soo-Yeon Cho Yunpyo Kim Shuye Zhang Xinlin Li Kwanwoo Shin Aiping Fu Hee-Tae Jung Chi Won Ahn Do Hwan Kim Institute for Future Automation School of Qingdao University Qingdao 266071 China Shandong Key Laboratory of Industrial Control Technology Automation School of Qingdao University Qingdao 266071 China Department of Chemical Engineering Pohang University of Science and Technology Pohang 37673 Republic of Korea Department of Chemical Engineering Hanyang University Seoul 04763 Republic of Korea Department of Chemical and Biomolecular Engineering (BK-21 Plus) Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305–701 Republic of Korea Institute of Microengineering École Polytechnique Fédérale de Lausanne (EPFL) Rue de la Maladière 71b Neuchâtel 2000 Switzerland Department of Mechanical Engineering Tsinghua University Beijing 100084 China Department of Chemical Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA Department of Chemistry and Institute of Biological Interfaces Sogang University Seoul 04107 Republic of Korea State Key Laboratory of Advanced Welding and Jointing Harbin Institute of Technology Harbin 150001 China College of Electromechanical Engineering Qingdao University Qingdao 266071 China College of Chemistry and Chemical Engineering Qingdao University Qingdao 266071 China Department of Nano-Structured Materials Research National NanoFab Center (NNFC) 291 Daehak-ro Yuseong-gu Daejeon 305–338 Republic of Korea Institute of Nano Science and Technology Seoul 04763 Republic of Korea

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Design and implementation of high-speed server based on dynamic thread pool

Design and implementation of high-speed server based on dyna...

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International Conference on Electronic Measurement and Instruments, ICEMI

作者： He Linfeng Gu Yuhai Wang Juyuan Key laboratory of electromechanical measurement and control Beijing Information Science and Technology University Beijing China

Because there are lots of wind generating sets in large wind farms, real-time monitoring and diagnosis of each point should be carried out in real time. Large amounts of real-time monitoring data need to be sent to the data server, and provides monitoring data for the visual client. it puts forward a high requirement to the real-time capability and data throughput of the data server. dynamic thread pool can be applied to the high speed data server software system of large fan monitoring and diagnosis system. The dynamic thread pool method is used to solve the high concurrency problems in the data server. According to the experiment, the dynamic thread pool method is more efficient than traditional thread pool.

关键词： Instruction sets Servers Databases Message systems Real-time systems Conferences

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