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Nonreciprocity of energy transfer in a nonlinear asymmetric oscillator system with various vibration states

Applied Mathematics and Mechanics(English Edition) 2023年第5期44卷 727-744页

作者： Jian’en CHEN Jianling LI Minghui YAO Jun LIU Jianhua ZHANG Min SUN Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China School of Aeronautics and Astronautics Tiangong UniversityTianjin 300387China Agricultural Information Institute of Chinese Academy of Agricultural Sciences Key Laboratory of Agricultural Big DataMinistry of Agriculture and Rural AffairsBeijing 100081China School of Science Tianjin Chengjian UniversityTianjin 300384China

The nonreciprocity of energy transfer is constructed in a nonlinear asymmetric oscillator system that comprises two nonlinear oscillators with different parameters placed between two identical linear *** slow-flow equation of the system is derived by the complexification-averaging *** semi-analytical solutions to this equation are obtained by the least squares method,which are compared with the numerical solutions obtained by the Runge-Kutta *** distribution of the average energy in the system is studied under periodic and chaotic vibration states,and the energy transfer along two opposite directions is *** effect of the excitation amplitude on the nonreciprocity of the system producing the periodic responses is analyzed,where a three-stage energy transfer phenomenon is *** the first stage,the energy transfer along the two opposite directions is approximately equal,whereas in the second stage,the asymmetric energy transfer is *** energy transfer is also asymmetric in the third stage,but the direction is reversed compared with the second ***,the excitation amplitude for exciting the bifurcation also shows an asymmetric *** vibrations are generated around the resonant frequency,irrespective of which linear oscillator is *** excitation threshold of these chaotic vibrations is dependent on the linear oscillator that is being *** addition,the difference between the energy transfer in the two opposite directions is used to further analyze the nonreciprocity in the *** results show that the nonreciprocity significantly depends on the excitation frequency and the excitation amplitude.

关键词： nonreciprocity strong nonlinearity energy transfer chaotic vibration higher branch of response

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Sensitivity analysis for dynamical response of reactor coolant system based on optimus

Sensitivity analysis for dynamical response of reactor coola...

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2020 International Conference on Nuclear Engineering, ICONE 2020, collocated with the ASME 2020 Power Conference

作者： Yanli, Yuan Xianhui, Ye Lijuan, Li Feng, Yuan Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791883785

The sensitivity analysis of the dynamical response of reactor coolant system to the input parameters is an important precondition for the design optimization. In this paper, the sensitivity of the dynamical loads at the nozzles of the equipment under seismic conditions is analyzed with an integrated platform called OPTIMUS, taking the stiffness of the dampers in the steam generator and the main pump as the input variables. The key parameters of the reactor system are usually different from the design value due to the calculation error, random and other uncontrollable errors in the manufacturing process and installation process. In a nuclear power project, the measured stiffness values of the dampers on the steam generator and the main pump in the manufacturer are deviated from the requirements in the equipment specification, and it is necessary to evaluate the influence of the deviation on the dynamical response analysis of the reactor system. According to the traditional method, it is necessary to establish the models of the reactor coolant system for nonlinear analysis according to the different stiffness of the dampers, and then the calculation results are compared by EXCEL. In this paper, the sensitivity analysis of output parameters which are the loads at the nozzles of the equipment to the input parameters which are the stiffness of the dampers on the steam generator and pump is realized by OPTIMUS, which is a kind of integration platform. Not only can ANSYS simulation calculations be carried out automatically on the OPTIMUS, but also the output data can be processed rapidly automatically, and the influence of manufacturing deviation of the stiffness of the dampers on the dynamical response of the reactor coolant system can be analyzed quantitatively in the above-mentioned problems, and the data support is provided for the determination of the design variables for subsequent optimization analysis. © 2020 American Society of Mechanical Engineers (ASME). All rig

关键词： Sensitivity analysis

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design of low-weight, small-size and high-efficiency equalization circuits based on switched-capacitors 4

Design of low-weight, small-size and high-efficiency equaliz...

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2022 4th International Conference on Electronic Engineering and Informatics, EEI 2022

作者： Ding, Yanhong Zhao, Xin Li, Kun Liu, Qing Shi, Gengxin School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China China Electronics Technology Group Corporation Tianjin China

ISBN: (纸本)9783800759231

An any cell to any cell equalization circuit, which is based on switched capacitors and energy bus, is proposed in this paper. In this equalization topology, any high voltage cell can directly transfer the power to any low voltage cell through energy bus. With the increasing miniaturisation and integration of circuit boards, the topology proposed in this paper reduces the size of the circuit by varying the capacitance and frequency in order to further reduce the area and weight of the circuit. At the same time compared with the equalization circuit using transformers or inductance devices, this circuit has the characteristics of low cost, low-weight, small-size, easy integration and simple control scheme and it is suitable for applictions such as aerospace and unmanned aerial vehicles. The feasibility of the circuit topology is verified by formula demonstration and simulation results. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Cells

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Numerical Study on Benchmark Analysis of NACIE-UP Facility with Uniform and Non-Uniform Power Distribution

SSRN

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SSRN 2024年

作者： Li, Haoyang Zhang, Dalin Zhou, Lei Deng, Jian Tian, Wenxi Su, Guanghui Qiu, Suizheng State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Nuclear Power Institute of China 328 Changshun Avenue Chengdu610213 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

The NACIE-UP facility is located at the ENEA Brasimone Research Centre and is designed to investigate the thermo-hydraulic properties of LBE within a wire-spaced assembly under uniform and non-uniform power distribution conditions. In this study, the thermo-hydraulic characteristics of FPS are analyzed. ANSYS Fluent solver is applied with the COUPLE algorithm of RANS [[EQUATION]] model. Cheng&Tak correlation and computational conditions are implanted into Fluent in the form of UDFs. The results show that the RMSEs of ADP10SS1 and ADP10SS2 are 2.52 K and 3.69 K, 7.05 K and 8.48 K for ADP06SS1 and ADP06SS2, respectively, which indicate that the adopted models have good prediction ability for the temperature of the experimental conditions. Meanwhile, the heat transfer characteristics are investigated and compared with the correlations of Ushakov, Mikityuk, Kazimi and Carelli. Above all, this study provides quantitative and qualitative analysis for verification and validation of CFD/STH code and stand-alone CFD simulation. © 2024, The Authors. All rights reserved.

关键词： Heat transfer

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Lubrication of Offshore Mechanical Components: Towards sustainable & reliable power production 15th

Lubrication of Offshore Mechanical Components: Towards susta...

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15th European Wave and Tidal Energy Conference, EWTEC 2023

作者： Tamayo, Juan Guillermo Zapata Glavatskih, Sergei System and Component Design KTH Royal Institute of Technology Stockholm Sweden Department of Electromechanical Systems and Metal Engineering Ghent University Ghent Belgium School of Chemistry Faculty of Science University of New South Wales Sydney Australia

As wave and tidal energy generators advance towards full-scale deployment and commercialization, addressing challenges in the marine environment regarding the lubrication of the components integrating the Power- Take-Off (PTO) system become crucial. Environmental acceptable lubricants that can be biodegraded such as watersoluble polymers are being considered as an alternative to control friction and wear in ocean energy generators. However, compared to synthetic lubricants or mineral oil, they have shown limitations in preventing corrosion, wear, and excessive friction, which can result in premature failure of moving parts. This study explores the potential of different water-soluble polymers as environmentallyfriendly lubricants that meet stringent regulations and provide effective protection against wear and corrosion in offshore conditions. The analysis focuses on the polymers ability to form an elastohydrodynamic film, mitigate surface degradation, prevent corrosion, as well as their rheological properties at different concentrations. The findings reveal that large polymers such as PAG when added in low concentrations in the water can form a separating film under high contact pressure in the low-speed region, while viscosity has shown to have less impact on the ability of the polymer to form a full film. Increasing polymer concentration in the aqueous solution negatively affects the corrosion resistance of steel components at the expense of improving the film-build up. These results offer valuable insights for designing lubrication solutions to protect offshore energy devices. © 2023 European Wave and Tidal Energy Conference.

关键词： Corrosion resistance

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Temperature Prediction Method for Windings by Homogeneous Material

Temperature Prediction Method for Windings by Homogeneous Ma...

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International Workshop on Advanced Motion Control (AMC)

作者： Akihiro Katsuno Toshiyuki Murakami Graduate School of Science and Technology Keio University Yokohama Japan Department of System Design Engineering Keio University Yokohama Japan

This paper describes the equivalent thermal conductivity for the hexagonally arranged windings and the correction method for the maximum temperature of the coil from that of the homogeneous unit. A stator with the homogenized slot is modeled with a lumped parameter thermal network (LPTN), and an analytical solution for the maximum coil temperature is derived. Because the LPTN expresses the average coil temperature, the thermal dependency of the electrical loss can be internalized into the thermal model without the coupled electromagnetic-thermal simulations. The simulational results showed that the developed model is much less computationally expensive than the all-coils-modeled FEM and produces more accurate results than the conventional method. The developed model is suitable for temperature estimation in real-time applications that simulate coil temperatures at low computational cost.

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Performance Improvement of Blink Types Classification Using a 3D-CNN by Mode Value Correction

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2025年第4期145卷 428-437页

作者： Sato, Hironobu Abe, Kiyohiko Matsuno, Shogo Ohyama, Minoru College of Science and Engineering Kanto Gakuin University 1-50-1 Mutsuura-higashi Kanazawa-ku Kanagawa Yokohama236-8501 Japan School of System Design and Technology Tokyo Denki University 5 Senju Asahi-cho Adachi-ku Tokyo120-8551 Japan Graduate School of Informatics and Engineering The University of Electro-Communications 1-5-1 Chofugaoka Chofu Tokyo182-8585 Japan

We have developed blink measurement methods that can be applied to input interfaces. To use the eye-blinking information as an input trigger, it is necessary to automatically classify blink types into voluntary and involuntary. A method for blink type classification using a three-dimensional convolutional neural network (3D-CNN) has been proposed. This classification method takes a short image sequence of the periocular area and classifies the blink type. We previously reported on several performance-improving methods that can be applied to this 3D-CNN. Since our classification using 3D-CNN outputs classification results in units of video frames, multiple types of classification results could be mixed together during a period of a single blinking motion. To address this problem, we employ a correction method to calculate the mode value as a representative value for the consecutive blink period. This paper proposes a correction method to improve accuracy based on limiting the aggregation range of the mode to a reliable portion. The evaluation experiment resulted in 97.9% accuracy and 94.0% F-score in the classification results for each short image sequence for 10 subjects. Then, 97.5% accuracy and 97.3% F-score were obtained for the accuracy of blink type classification. © 2025 The Institute of Electrical Engineers of Japan.

关键词： Convolutional neural networks

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Dispersion Engineering of Crystalline Microresonators for Optical Frequency Comb Generation beyond C-Band

Dispersion Engineering of Crystalline Microresonators for Op...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Ryomei Takabayashi Hikaru Kodama Koya Tanikawa Yasuhiro Kakinuma Takasumi Tanabe Shun Fujii Department of Electronics and Electrical Engineering Faculty of Science and Technology Keio University Yokohama Japan Department of System Design Engineering Faculty of Science and Technology Keio University Yokohama Japan Department of Physics Faculty of Science and Technology Keio University Yokohama Japan

We detail a dispersion engineering strategy for microresonators allowing us to generate microcombs in the near-infrared and mid-infrared regimes, and identifying optimal shapes for achieving anomalous dispersion suite... 详细信息

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Shape C-band Lasers and electrooptics Microcavities Optical harmonic generation Dispersion Electro-optical waveguides

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Small-Target Infrastructure Detection with Spatial Tracking and Multi-Level Feature Extraction of Railway Track Scenes

Small-Target Infrastructure Detection with Spatial Tracking ...

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2024 International Conference on Intelligent Communication, Sensing and Electromagnetics, ICSE 2024

作者： Du, Heng Cang, Huaiming Bai, Yiwen Wang, Xinyi Beijing Elephant Technology Co. Ltd Beijing China School of Transportation Science and Engineering Beihang University Beijing102206 China State Key Lab of Intelligent Transportation System Beijing100191 China School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechanical System Design and Intelligent Control Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin300384 China

ISBN: (纸本)9798350354935

In the field of railway transportation, with the continuous improvement of train running speed and the continuous increase of operating mileage, it becomes particularly important to ensure the safety and integrity of small-Target infrastructure along the railway train. Although many small-Target detection methods have been proposed, the research on small-Target infrastructure detection along rail trains is very rare. To solve this problem, this paper proposes a small-Target infrastructure detection network with spatial tracking and multi-level feature extraction based on Yolov8n. The experimental results show that ST-YOLO has a 3.6% mAP improvement on the OSDaR23 dataset compared to the baseline Yolov8n, and shows significant advantages over other state-of-The-Art methods. © 2024 IEEE.

关键词： Railroads

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DPN: decoupling partition and navigation for neural solvers of min-max vehicle routing problems 24

DPN: decoupling partition and navigation for neural solvers ...

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Proceedings of the 41st International Conference on Machine Learning

作者： Zhi Zheng Shunyu Yao Zhenkun Wang Xialiang Tong Mingxuan Yuan Ke Tang Department of Computer Science and Engineering Southern University of Science and Technology Shenzhen China Department of Computer Science City University of Hong Kong Hong Kong SAR and School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China China Huawei Noah's Ark Lab Shenzhen China

The min-max vehicle routing problem (min-max VRP) traverses all given customers by assigning several routes and aims to minimize the length of the longest route. Recently, reinforcement learning (RL)-based sequential planning methods have exhibited advantages in solving efficiency and optimality. However, these methods fail to exploit the problem-specific properties in learning representations, resulting in less effective features for decoding optimal routes. This paper considers the sequential planning process of min-max VRPs as two coupled optimization tasks: customer partition for different routes and customer navigation in each route (i.e., partition and navigation). To effectively process min-max VRP instances, we present a novel attention-based Partition-and-Navigation encoder (P&N Encoder) that learns distinct embeddings for partition and navigation. Furthermore, we utilize an inherent symmetry in decoding routes and develop an effective agent-permutation-symmetric (APS) loss function. Experimental results demonstrate that the proposed Decoupling-Partition-Navigation (DPN) method significantly surpasses existing learning-based methods in both single-depot and multi-depot minmax VRPs. Our code is available at.

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