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第二届先进电子材料、计算机与材料工程国际学术会议（AEMCME 2019）

作者： Qiaoran Zhao Li Sui Ping Song School of Mechatronical Engineering Beijing Institute of Technology Science and Technology on Electromechanical Dynamic Control Laboratory

With the development of micro-machining technology, the application of microchannel is becoming more and more popular. In this paper, we design a set of time-delay device based on micro-channel and micro-fluidics technology. This paper describes the timedelay device's working principle and analyses the micro-channel's flow characteristics by simulation method based on Coventerware. From studies on the micro-channel's cross section, geometry and dimension parameters, the micro-channel's optimal form and dimension can be obtained. Finally, this paper chooses ultra-machining process to fabricate the time-delay device.

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RETRACTED ARTICLE: Optimal design and experimental study of a layer metering sensor for high-speed penetration through multi-layer hard targets

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Soft Computing 2021年第2期28卷 423-423页

作者： Yu, Haoyuan Zou, Qipeng Sui, Li Zhang, Li Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Northwest Industries Group Co. Ltd Xi’an China

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Short-Range Detection of Ferromagnetic Target Based on Tunneling Magnetoresistance Sensor

Short-Range Detection of Ferromagnetic Target Based on Tunne...

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IEEE International Conference on Unmanned Systems (ICUS)

作者： Qiang Fan Jiahao Deng Zuodong Duan Xiaowei Wei Sha Xu Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing institute of Technology Beijing China

ISBN: (纸本)9781728137933

In order to improve the accuracy of short-range ferromagnetic target location and distance-determination, the short-range detection technology of ferromagnetic target based on tunneling magnetoresistance (TMR) sensor is studied in this paper. Based on the analysis of the tunneling magneto-resistance effect principle and the understanding of the relevant magnetic field detecting components, a suitable signal conditioning and signal processing circuit is designed to constitute the TMR magnetic detector. Two kinds of ferromagnetic targets with regular shapes are measured at different distances and orientations, and the measured data are analyzed by curve fitting method. The results show that the output signal amplitude value of the detector is inversely proportional to the cubic power of the relative distance between the detector and the measured target when it is in the near field (no more than 5 meters in this paper). And the influence of the measured target material and detection orientation on the relationship between the two also shows a certain correlation. On the basis of the short-range static detection of general ferromagnetic targets, dynamic tests were carried out with the aim of household cars, the results indicate that the detection distance of dynamic vehicles can reach 7 meters.

关键词： Xenon

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Numerical model of direct internal reforming SOFC: A Comparison between Anode-support and Metal-support 16

Numerical model of direct internal reforming SOFC: A Compari...

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16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019

作者： Wang, Y. Ren, J. Shi, Y. Li, X. National Key Laboratory on Electromechanical Dynamic Control Beijing Institute of Technology Beijing100081 China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9781607688747

Direct internal reforming (DIR) operation provides many benefits for solid oxide fuel cells (SOFCs) by eliminating the need for an extra reformer. Anode-supported SOFCs (AS-SOFCs) are commonly used for DIR operations. However, the strong endothermic reforming reactions at the cell entrance may result in large thermal stresses and lead to premature failure. In this study, a two-dimensional model was developed to analyze the differences between the AS-SOFC and the new generation metal-supported SOFC (MS-SOFC) in DIR operations. The model considered the coupling effects of the chemical/electrochemical reactions, the mass/charge/heat transport processes and the thermal mechanical stress. The distributions of temperature, species composition, current density and thermal stress were determined and compared for both structures. The failure probability of the cell was estimated by stress distributions. The results showed that the MS-SOFC led to a gentler temperature distribution and a smaller failure probability with slight performance increase compared to the AS-SOFC. © The Electrochemical Society.

关键词： Solid oxide fuel cells (SOFC)

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Self-powered wireless impedance sensing for structural health monitoring

Self-powered wireless impedance sensing for structural healt...

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IEEE International Conference on Unmanned Systems (ICUS)

作者： Yue Feng Xusong Tang Bohan Shao Yanhui Han Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Beijing Orient Institute of Measurement & Test Beijing China

ISBN: (纸本)9781728137933

Structural damage is often accompanied by equipment failures and safety incidents. For example, aircraft accidents often result from wing breaks and landing gear damage. The self-powered wireless sensing technology is ideal tool for monitoring structural health in multi-locations. In this work, we designed an airflow-driven energy harvester (EH) and integrate into wireless impedance sensing system. Also, the Energy Management and control Circuit (EMC) is designed to provide a stable DC voltage for intermittently driven sensing system. The experimental results show that the self-powered impedance sensing system can operate at every 3 min at a wind speed of 8 m/s. The system error is within 5% compared to the Agilent 4294A (Precision Impedance Analyzer) and the characteristics of the material cracks could be successfully detected and analyzed.

关键词： Energy harvesting Monitoring

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Weak Signal Detection with Duffing Oscillator Based on Circular Boundary Counting Method and STFT State Identification Parameter

Weak Signal Detection with Duffing Oscillator Based on Circu...

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2019 2nd International Conference on Electrical and Electronic Engineering（EEE 2019）

作者： Zhi-qiang ZHU Rui-li JIA Xiao-peng YAN Ke WANG Jian HOU Science and Technology on Electromechanical Dynamic Control Laboratory School of Mechatronical Engineering Beijing Institute of Technology Beijing Jinghang Research Institute of Computing and Communication

To solve the problem of quantitative identification of the state of Duffing oscillator and determination of the critical threshold of reference amplitude, a combined weak signal detection method is proposed in this paper. The STFT statistical characteristics of Duffing oscillator in chaotic state, intermittent state and large-scale periodic state is analyzed and based on it the state identification parameter is selected to quantitatively present the state of Duffing oscillator. The step change of the number of the phase points on the boundary of circular regions in the phase plane is shown and the circular boundary counting method is proposed to determine the critical threshold. Based on above research, the algorithm of the combined weak signal detection is given, which uses Runge-Kutta algorithm to calculate the Duffing system. Simulation results show that this combined method is not only accurate at low SNR, but also robust when noise condition is variable.

关键词： Weak signal detection Duffing oscillator Circular boundary counting method State identification Determining critical value

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Neural dynamic Surface Containment control for Multiple Quadrotors

Neural Dynamic Surface Containment Control for Multiple Quad...

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IEEE International Conference on Unmanned Systems (ICUS)

作者： Xingling Shao Biao Tian Dongguang Li Key Laboratory of Instrumentation Science & Dynamic Measurement Ministry of Education North University of China School of Instrument and Electronics North University of China Taiyuan China Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China

ISBN: (纸本)9781728137933

This paper presents an neural dynamic surface containment control design for multiple quadrotors with uncertainties, such that the followers can be driven into the convex hull constituted by multiple dynamic leaders. To facilitate the control design, the quadrotor dynamics is decomposed into translational and rotational subsystems. For each subsystem, in order to enable smooth and rapid learning of unknown system uncertainties and reduce the computational load in traditional neural network (NN), the estimation errors, instead of tracking errors, are used to regulate NN weights and only one NN learning parameter is required for adaptive neural approximation with the aid of minimal learning parameter (MLP), which is more feasible for real-time implementation. Additionally, dynamic surface control (DSC) technique is introduced to extract the time derivative of virtual control laws, and thus the issue of "explosion of complexity" can be circumvented. Finally, the stability analysis is established. Simulation results illustrate the effectiveness and superiority of the proposed control scheme.

关键词： Instruments Graph theory control design Stability analysis

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Microfluidic inertial switch with delay response characteristics

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Journal of Physics: Conference Series 2020年第10期1507卷

作者： Weirong Nie Guowei Liu Runduo Zhang School of Mechanical Engineering Nanjing University of Science and Technology Nanjing China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

This paper proposes an innovation microfluidic inertial switch structure with precise time delay response characteristic, which can be used in the fuze safety and arming system. The switch works on the principle of fluidic inertial force and capillary valve, which makes it sensitive to the unidirection acceleration load and has the ability to recognize the acceleration amplitude. The microfluidic inertial switch has a structure of a J-shaped reservoir, capillary valves, a serpentine delay microchannel and a U-shaped latching microchannel. The acceleration threshold is analyzed theoretically considering the surface tension coefficient of the gas-liquid interface. The delay response time of the switch is studied by finite element simulation based on the Gambit 2.4 and Fluent 6.3 software. The prototype is fabricated by wet etching technology and magnetron sputtering metal technology. Many tests have been done to verify the functions of the switch. The experimental results are matched well to the results of calculation and simulation. When the capillary valve throat widths are 80μm, 120μm, 160μm, the thresholds of the switch are 75.1g, 46.6g, 36.5g. When the switch is loaded with a 75g acceleration load, the delay response is 146.7ms. Finite element simulation and experimental results show that the switch can effectively identify the acceleration threshold, and can achieve a precise delay response under a certain load.

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Research on the Characteristics of Wireless Power Transfer in Non-ferromagnetic Metal Pipe

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Journal of Physics: Conference Series 2020年第1期1607卷

作者： Changsheng Li Yong Liu Defu Hu Wei Sun Science and Technology on Electromechanical Dynamic Control Laboratory China Ministerial Key Laboratory of ZNDY Nanjing University of Science and Technology Nanjing 210094 Jiangsu China

With the development of various electronics, the way of transmitting energy by wire has brought increasingly negative effects on the operability and convenience of products. As wireless power transfer (WPT) technology requires no transmission lines, it has received increasingly wide attention. Most of the previous research on the technology of magnetic resonant coupling WPT mainly focused on the transmission of energy in the air. This paper establishes the wireless power transfer system model under non-ferromagnetic metallic environment and studies the effect of non-ferromagnetic metallic environment on coil self-inductance L, mutual inductance M and coil resistance R of WPT system. On this basis, the study on the relationship between coil diameter and mutual inductance is carried out for aluminium pipe, and the relationship between coil diameter and diameter of metal pipe at the maximum mutual inductance is fitted. Besides, experimental verification is conducted for the change of mutual inductance between the coils of WPT system in the aluminium pipe, presenting that the actual measurement results of mutual inductance in the aluminium pipe are consistent with the theory.

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Structural Optimization Design of H-type Piezoelectric Actuator Based on APDL

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Journal of Physics: Conference Series 2020年第1期1637卷

作者： Suyuan Rui Xinjie Wang School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an 710065 China

Aiming at the problem of low efficiency in optimizing the H-type piezoelectric actuator with the 'trial method', this article uses a program written in the APDL (ANSYS Parametric Design Language) to optimize the structure of the piezoelectric actuator. First, a parametric finite element model is established based on the initial data values of the mover structure. Modal analysis and sensitivity analysis are performed to determine the design variables. Then, the objective function is determined based on the frequency consistency of the two-phase working modes. Finally, based on the optimization tool proposed in this paper, the structure of the H-type piezoelectric actuator is optimized. The optimization results show that the optimization program based on APDL can achieve the optimal design requirements of the H-type piezoelectric actuator and shorten the time required for structural optimization design.

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