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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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Study on uncertainty reasoning of running reliability testing face to CNC machine

Study on uncertainty reasoning of running reliability testin...

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7th International Symposium on Test Automation and Instrumentation, ISTAI 2018

作者： Wu, Guoxin Zuo, Yunbo Wang, Hongjun Xu, Xiaoli Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science &Technology University Beijing China School of Electromechanical Engineering Beijing Information Science &Technology University Beijing China

It is necessary to test the reliability of the operation of the machine itself for meeting the high-speed, ultra-precision, flexible, and other modern manufacturing and processing needs. In practical applications, the obtained reliability detection information presents a variety of uncertainties such as randomness, imprecision, incompleteness and so on, due to the complexity of the machining environment, the limitations of the sensor itself and the imperfections of the information acquisition technology. The uncertainty reasoning method is proposed to test reliability and accuracy precision. Based on the multi-sensor information characteristic, the rule of the credibility sets is established to achieve the operational reliability analysis. It can realise the uncertainty reasoning for the modal and reliability rules. Examples of analysis show that during the high-end CNC machine tools operational reliability analysis, it has a practical effect to study the uncertainty reasoning method of the modal and reliability propositional rule and the analysis basis can be provided for the precision degradation and fault diagnosis. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Reliability analysis

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Publisher Correction: An open dataset for intelligent recognition and classification of abnormal condition in longwall mining

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Scientific data 2024年第1期11卷 848页

作者： Wenjuan Yang Xuhui Zhang Bing Ma Yanqun Wang Yujia Wu Jianxing Yan Yongwei Liu Chao Zhang Jicheng Wan Yue Wang Mengyao Huang Yuyang Li Dian Zhao School of Mechanical Engineering Xi'an University of Science and Technology No.58 Mid-Yanta Road Xi'an 710054 China. Shaanxi Key Laboratory of Mine electromechanical equipment intelligent Detection and control No.58 Yanta Road Xi'an 710054 China. School of Mechanical Engineering Xi'an University of Science and Technology No.58 Mid-Yanta Road Xi'an 710054 China. zhangxh@***. Shaanxi Key Laboratory of Mine electromechanical equipment intelligent Detection and control No.58 Yanta Road Xi'an 710054 China. zhangxh@***. MARCO automatic control system development Co. LTD No.20 Fenghui South Road Xi'an 710054 China.

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Study on Water Absorptivity and Frost Resistance Performance of Self-ignition Coal Gangue Autoclaved Aerated Concrete

Research Square

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Research Square 2021年

作者： Cong, Xinyu Tan, Yiqiu Lu, Shuang Wang, Zhaojia Huang, Tianyong School of Transportation Science and Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education 9 Harbin Institute of Technology Harbin150090 China State Key Laboratory of Solid Waste Reuse for Building Materials Materials Academy of Science Research Beijing Building 11 Beijing100041 China

Self-ignition coal gangue (SCG) used as one of precursors to fabricate aerated autoclaved concrete (AAC). Aiming at studying water absorptivity and frost resistance performance of self-ignition coal gangue aerated autoclaved concrete (SCGAAC), three-period water absorbing tests and freezing-thawing tests were carried out and the corresponding results were recorded and analyzed. In order to modify the water absorptivity of SCGAAC, foam stabilizer was applied to adjust pore structure while calcium stearate was expected to change hydrophilic feature of CG. It was demonstrated that the compressive strength of SCGAAC containing foam stabilizer or calcium stearate declined at different levels, although the porosity became lower slightly. For water absorptivity, foam stabilizer failed to decrease the water content at any period and even increased water absorbing rates. Calcium stearate controlled water absorbing rate successfully but the ultimate water content hardly reduced. All of the SCGAAC samples exhibited intact appearance after 50 freezing-thawing cycles and showed excellent frost resistance performance. Three models were proposed to predict water absorptivity and frost resistance performance of SCGAAC and the corresponding prediction results matched test resulted ***: Self-ignition coal gangue;AAC;porosity;water absorptivity;frost resistance performance © 2021, CC BY.

关键词： Porosity

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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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Mass Transfer-Enhanced Photothermal Membranes with Synergistic Light Utilization for High-Turbidity Wastewater Purification

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Angewandte Chemie 2024年第11期137卷

作者： Jiangchen Fu Shaoze Xiao Jiazhen Cao Zhiyan Liang Jiabin Chen Yue Jiang Prof. Mingyang Xing Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry & Molecular Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China Key Laboratory of Yangtze River Water Environment Shanghai Institute of Pollution Control and Ecological Security Tongji University Shanghai 200092 China

The photo-Fenton process faces significant limitations in treating high-turbidity, colored wastewater due to light attenuation and impurity interference (blocked mass transfer). To address these issues, we developed a suspended photothermal Fenton membrane by loading a photothermal catalyst on a hydrophobically modified cotton filter paper, enabling precise suspension 1 mm below the water surface. This design achieved 89.49 % light utilization and high chemical oxygen demand (COD) removal, even in wastewater with extreme chromaticity (10 multiples) and turbidity (703 NTU). The enhanced photothermal conversion accelerated molybdenum co-catalyzed Fenton reactions and improved peroxymonosulfate (PMS) activation, maintaining over 90 % phenol removal for 15 days. Mechanistic simulations revealed improved mass transfer of reactive oxygen species (ROS) and pollutants at the solid–liquid interface, with PMS diffusion identified as the rate-limiting step. The membrane resisted fouling from suspended solids and maintained stable operation in soil-containing solutions for 10 days. This innovative approach offers an efficient solution for degrading pollutants in dark-colored, high-turbidity wastewater, overcoming traditional process limitations.

关键词： Suspended membrane Photothermal Fenton Efficient light utilization Enhanced mass transfer High-turbidity wastewater purification

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The visualization of turbulent coherent structure in open channel flow

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Journal of Hydrodynamics 2019年第2期31卷 266-273页

作者： Xiao-dong Bai Wei Zhang Qing-he Fang Yong Wang Jin-hai Zheng An-xin Guo Ministry of Education Key Laboratory of Coastal Disaster and Defence Hohai UniversityNanjing 210098China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 21009China 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 Civil EngineeringHarbin Institute of TechnologyHarbin 150090China Max Planck Institute for Dynamics and Self-Organization GottingenGermany

Due to its multiscale and multi-layer natures,the coherent structures of turbulent in the open channel flow is complex and difficult to be visualized for understanding its *** this paper,five types of methods for the vortical structure in the fluids,namely the Q-criterion,the vorticity,the Omega method,the velocity-vorticity correlation structures(VVCS)as well as the most recent Rortex method,are adopted to visualize the turbulent flow in the open *** the free surface modelled as a free slip boundary,a direct numerical simulation(DNS)is carried out to study the multi-layered flow structure characteristics under the free *** visualization results by the Q-criterion,the vorticity,the Omega method and the Rortex are firstly *** the turbulent flow layers near the free surface are identified with corresponding anisotropy ***,the VVCS within various turbulence layers are visualized *** research indicates that the VVCS can straightforwardly show the geometry information of the cohere nt structures of turbulent in different layers for the ope n channel flow.

关键词： Open channel flow flow visualization velocity-vorticity coherent structure direct numerical simulation(DNS)

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A formal approach to the co-design of embodied intelligence

arXiv

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arXiv 2020年

作者： Zardini, Gioele Milojevic, Dejan Censi, Andrea Frazzoli, Emilio Institute for Dynamic Systems and Control ETH Zürich Zürich Switzerland Automotive Powertrain Technologies Laboratory Empa - Swiss Federal Laboratories for Materials Science and Technology Dübendorf Switzerland

We consider the problem of co-designing embodied intelligence as a whole in a structured way, from hardware components such as propulsion systems and sensors to software modules such as control and perception pipelines. We propose a principled approach to formulate and solve complex embodied intelligence co-design problems, leveraging a monotone co-design theory. The methods we propose are intuitive and integrate heterogeneous engineering disciplines, allowing analytical and simulation-based modeling techniques and enabling interdisciplinarity. We illustrate through a case study how, given a set of desired behaviors, our framework is able to compute Pareto efficient solutions for the entire hardware and software stack of a self-driving vehicle. © 2020, CC BY-NC-ND.

关键词： Propulsion

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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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