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2020 4th International Conference on Electrical, Mechanical and Computer Engineering, ICEMCE 2020

作者： Yang, Kai Bao, Guangcheng Zeng, Ying Tong, Li Shu, Jun Yan, Bin Henan Key Laboratory of Imaging and Intelligent Processing PLA Strategic Support Force Information Engineering University Henan Zhengzhou China Key Laboratory for Neuro Information of Ministry of Education School of Life Science and Technology University of Electronic Science and Technology of China Sichuan Chengdu China

The non-stationarity of electroencephalograph (EEG) signals has been a barrier in real-life application of EEG-based emotion recognition. The features extracted from emotional EEG vary from one session to another and a model trained on a temporally-limited EEG dataset may generalize poorly to data recorded at a different time for the same individual. In this study, the EEG features that stably characterize the differences between emotions are firstly explored. Then the classic progressive transductive support vector machine (PTSVM) is extended to three-classes classifications by a new region labelling rule, furthermore K-nearest neighbour algorithm and iterative process are utilized to improve the confidence of the predicted labels. Experimental results indicate that high gamma band local activation difference features and network features derived from prefrontal lobe, the temporal lobe on both sides, the left occipital-parietal lobe, the right occipital lobe and the posterior occipital lobe are temporally stable features for distinguishing different emotions (positive, neutral and negative). And the proposed session-to-session transfer model achieves an averaged classification accuracy 63.56% for three emotions classification on our dataset recorded from 23 subjects in three different days, which is 4% higher than the existing best adaptive classification model. Hence, the proposed classification model can effectively improve the performance of EEG-based session-to-session emotion recognition. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Emotion Recognition

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The future and technique challenges of high-speed ground effect vehicle enrolled in maritime transportation

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Aerospace Traffic and Safety 2024年第1期1卷 43-54页

作者： Jianhong Sun Chenlu Wang Daren Zheng Zhi Sun Hao Liu Zhuoran Sheng Shengrun Zhang Weidong Zhao Key Laboratory of Aircraft Environment Control and Life Support MIITNanjing 210016China Key Laboratory of Civil Aviation Emergency Science&Technology CAACNanjing 211106China

This paper presents a high-speed ground effect vehicle(HS-GEV)used specifically for maritime *** the limitations of current vessels,including various types of watercraft and high-speed boats,in fulfilling of needs in different maritime transportation scenarios,the HS-GEV emerges as a promising solution to address unmet *** efficiently accomplish maritime transportation missions with quickness and safety,several critical features are emphasized,including short take-off on water,flight maneuverability and flight *** key techniques required to achieve these features,as well as recent progress highlights,are *** and promoting these crucial techniques is also suggested as a future step to improve HS-GEV *** its predominant features,the HS-GEV holds immense application value in enhancing a high-speed maritime transportation system that aligns with the evolving needs of the real world.

关键词： HS-GEV Maritime Transportation Drag Reduction Combined Power Wing-in-Ground(WIG)Effect Ground Effect Vehicle(GEV)

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Health Assessment of Split Torque Transmission System Using Improved Generative Adversarial Networks

Health Assessment of Split Torque Transmission System Using ...

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TEPEN International Workshop on Fault Diagnostics and Prognostics, TEPEN-IWFDP 2024

作者： Wang, Zhi Hu, Niaoqing Xu, Fujian Yang, Yi Hu, Lei Laboratory of Science and Technology on Integrated Logistics Support NUDT Changsha410073 China Beijing Tangzhi Technology Development Co. LTD Beijing100043 China AECC Hunan Aviation Powerplant Research Institute Zhuzhou412002 China Aero-Engine Vibration Technology in Aeronautical Science Key Laboratory Zhuzhou412002 China Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and Technology Xiangtan411201 China

ISBN: (纸本)9783031694820

Split-torque transmission system (STTS) is a new type of helicopter main rotor transmission. It has the characteristics of light quality, fewer transmission stages, high transmission efficiency, high reliability, low noise and so on. It is of great significance to carry out health detection and assessment for helicopter STTS. In order to solve the lack of fault data and priori knowledges, this paper proposes a framework for STTS anomaly detection and health assessment based on improved generative adversarial networks (IGAN). The framework is validated with fault simulation data of a STTS. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Generative adversarial networks

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Time-Frequency Characteristics of Parachute Gun Shockwave Based on VMD-HT

Time-Frequency Characteristics of Parachute Gun Shockwave Ba...

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Communication, Image and Signal Processing (CCISP), International Conference on

作者： Jun Li Wujun Xie Hui Li Liyi Fang Key Laboratory of Science and Technology on Life-support Technology AVIC Aerospace Life-support Industries LTD Xiangyang Hubei China

During the ejection process of the fighter pilot, the parachute is shot out by the life-saving seat gun, which generates a shockwave that endangers human safety. In order to accurately and stably extract the time-frequency distribution characteristics, the shockwave signal is obtained through parachute gun shooting experiments, and features of the shockwave signal is extracted by using Variational mode decomposition and Hilbert transform methods (VMD-HT). VMD is a high sampling rate shockwave signal decomposition technique, which is suitable for analysing unsteady airborne parachute gun shooting shockwave signals. The HT method is used to accurately extract the relationship between time, instantaneous frequency and energy for the decomposed signal, and to obtain the marginal spectra. The analytic results show that the shockwave signal lasting 3ms has a significant energy concentration in the low frequency band of 0∽1kHz, which is important for the better protection of pilots.

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A Review of Dynamic Analysis and Fault Diagnosis for Split-Torque Transmission System

A Review of Dynamic Analysis and Fault Diagnosis for Split-T...

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TEPEN International Workshop on Fault Diagnostics and Prognostics, TEPEN-IWFDP 2024

作者： Yang, Weixin Wang, Zhi Yin, Mei Hu, Lei Xu, Yuandong AECC Hunan Aviation Powerplant Research Institute Zhuzhou412002 China Aero-Engine Vibration Technology in Aeronautical Science Key Laboratory Zhuzhou412002 China Laboratory of Science and Technology on Integrated Logistics Support NUDT Changsha410073 China Beijing Tangzhi Technology Development Co. Ltd. Beijing100043 China Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and Technology Xiangtan411201 China

ISBN: (纸本)9783031694820

Split-torque transmission systems (STTS) of helicopters are designed as alternatives to traditional planetary gearboxes. STTS has the advantages of a large reduction ratio, lower energy losses, low noise levels from gear meshes, and high power density, etc. However, STTS has a more complex structure, more degrees of freedom, more complex external excitations and faults that are more difficult to diagnose. Therefore, research on the dynamics and fault diagnosis of STTS is of great significance to improve operational reliability. This paper reviews the current research status of STTS dynamic modelling and load sharing performance first, then the research on STTS fault diagnosis, followed by a summary of challenges and future research. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Epicyclic gears

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RUL Prediction of Split Torque Transmission System Using Particle Filtering and Degenerate Model

RUL Prediction of Split Torque Transmission System Using Par...

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TEPEN International Workshop on Fault Diagnostics and Prognostics, TEPEN-IWFDP 2024

作者： Yang, Weixin Wang, Zhi Tang, Xin Hu, Lei Xu, Yuandong AECC Hunan Aviation Powerplant Research Institute Zhuzhou412002 China Aero-Engine Vibration Technology in Aeronautical Science Key Laboratory Zhuzhou412002 China Laboratory of Science and Technology on Integrated Logistics Support NUDT Changsha410073 China Beijing Tangzhi Technology Development Co. LTD. Beijing100043 China Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Hunan University of Science and Technology Xiangtan411201 China

ISBN: (纸本)9783031694820

The split-torque transmission system (STTS) is considered to be the most likely alternative to a planetary gearbox for helicopter main rotor transmissions. SSTS has obvious advantages in reliability, weight, deceleration ratio, noise, and so on. The remaining useful life (RUL) prediction of STTS is of great significance to support the maintenance of helicopters and prevent them from failure. This paper designs a RUL prediction framework based on particle filtering and degenerate models. The prediction method of the degradation rate tracking particle filter (DRT-PF) eliminates the binding of the fitted model, and estimates and predicts the degradation process of the system by using the statistical law of the degradation rate of the historical data. The prediction framework is validated with simulation signals from a STTS fault model. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Epicyclic gears

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The facile method developed for preparing polyvinylidene fluoride plasma separation membrane via macromolecular interaction

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Chinese Journal of Chemical Engineering 2022年第9期35卷 140-149页

作者： Juanjuan Liu Xiaolong Lu Guiming Shu Ke Li Shuyun Zheng Xiao Kong Tao Li Jun Yang Tianjin Key Laboratory of Extracorporeal Life Support for Critical Diseases Tianjin Artificial Cell Engineering Technology Research CenterInstitute of Hepatobiliary DiseaseThe Third Central Hospital Affiliated to Nankai UniversityTianjin Third Central HospitalTianjin 300170China State Key Laboratory of Separation Membrane and Membrane Processes School of Material Science and EngineeringInstitute of Biological and Chemical EngineeringTiangong UniversityTianjin 300387China Clinical Laboratory Tianjin Children’s HospitalTianjin 300074China State Key Laboratory of Membrane Materials and Membrane Applications Tianjin Motimo Membrane Tech.Co.LtdTianjin 300457China The Key Laboratory of Bioactive Materials College of Life ScienceNankai UniversityTianjin 300000China

The design of membrane pore is critical for membrane preparation. Polyvinylidene fluoride(PVDF) membrane exhibits outstanding properties in the water-treatment field. However, it is a huge challenge to prepare PVDF macro-pore plasma separation membrane by non-solvent induced phase separation(NIPS). Herein, a facile strategy is proposed to prepare PVDF macro-pore plasma separation membrane via macromolecular interaction. ATR-FTIR and ^(1)H NMR showed that the intermolecular interaction existed between polyethylene oxide(PEO) and polyvinylpyrrolidone(PVP). It could significantly affect the PVDF macro-pore membrane structure. The maximum pore of the PVDF membrane could be effectively adjusted from small-pore/medium-pore to macro-pore by changing the molecular weight of PEO. The PVDF macro-pore membrane was obtained successfully when PEO-200 k existed with PVP. It exhibited higher plasma separation properties than the currently used plasma separation ***, it had excellent hemocompatibility due to the similar plasma effect, hemolysis, prothrombin time, blood effect and complement C_(3a) effect with the current utilized plasma separation membrane,implying its great potential application. The proposed facile strategy in this work provides a new method to prepare PVDF macro-pore plasma separation membrane by NIPS.

关键词： Membranes Macro-pore plasma separation membrane Hemocompatibility Purification Biomedical engineering

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Numerical study of thermal-hydraulic performances of microchannel heat sinks with different channel structures

Numerical study of thermal-hydraulic performances of microch...

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CSAA/IET International Conference on Aircraft Utility Systems 2020, AUS 2020

作者： Zhang, Gaogao Xu, Yu Dai, Qiumin School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9781839535635

Numerical simulations were carried out to investigate the thermal-hydraulic characteristics of water flowing through different heat sinks. Calculations show that the internal fin structure of the heat sink has an important influence on the flow resistance and heat transfer. The zigzag channel has the largest flow resistance, while the straight channel has the smallest flow resistance, but the heat transfer capacity is opposite. In addition, the performance of heat sinks when inserting pin fins with different shapes in straight channels was also compared. The results show that the thermal resistance of circular pin fins is the smallest. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Microchannels

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Equivalent study on delethalization test for sled head injury criteria test of civil aircraft passenger seat

Equivalent study on delethalization test for sled head injur...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： Z. Jin W. Shen G. Luo M. Li Z. Jia W. Zhou L. Jia L. Zhang Aviation Key Laboratory of Science and Technology on Life-support Technology Xiang yang China Test Department AVIC Aerospace Life-Support Industries LTD No.29 Xinhua road Xiang yang China

The equivalent study between delethalization test and sled HIC test is in order to improve the efficiency of Head Injury Criteria (HIC) test on civil aircraft passenger seats, as well as to reduce the test consumption and cost. The equivalent impact model was established based on the equal rotatory kinetic energy, then the test of equal energy impact was designed and the delethalization test was carried out. The results of delethalization test and sled HIC test show that all the deviation value of HIC, peak head center of gravity (CG) acceleration in X direction, peak head CG resultant acceleration and the deformation of the seat back (C/B) was within ± 20%. In conclusion, the equivalent impact model in this paper is suitable, and the delethalization test be used as an equivalent method for sled HIC test is feasible.

关键词： aircraft seats biomechanics vibrations vehicle dynamics impact (mechanical) safety devices injuries elasticity impact testing

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Simulation study on dynamic opening characteristics of airplane drag chute under the condition of stable crosswind

Simulation study on dynamic opening characteristics of airpl...

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CSAA/IET International Conference on Aircraft Utility Systems (AUS 2020)

作者： L. Jin P. Yang X. Hu H. Li L. Zhang D. Cui Aviation Key Laboratory of Science and Technology on Life-support Technology Xianyang China AVIC The First Aircraft Institute Institute of mechanical and electrical system Xi’an China

In this paper, the ALE fluid-solid coupling algorithm is used to realize the simulation of the dynamic opening process of a certain type of airplane drag parachute. Based on the drag parachute working principle and folding process, a finite element model of the main parachute in the installed state is established. In the LS-DYNA software, the parachute opening characteristics of the drag parachute were simulated and analyzed under no crosswind conditions and Stable crosswind conditions at speed 10m/s. The results show that, under the condition of no crosswind, the error of the important parameters such as parachute straightening force, parachute opening dynamic load, parachute deflection angle and test data is less than 15%, and the simulation accuracy meets the engineering development requirements. On this basis, the parameters such as the unfolding shape, deflection angle, and stress state of the parachute parachute under stable crosswind conditions, which are difficult to test and simulate, were studied. This will provide a theoretical basis and technical approach for drag chute design and other types of parachute product research.

关键词： finite element analysis parachutes aerospace simulation aerospace testing drag design engineering

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