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Remaining Useful Life Prediction of Rolling Bearings Based on Global-Local Attention Mechanism Transformer with Multi-Source Feature-Weighted Kernel Principal Component 5

Remaining Useful Life Prediction of Rolling Bearings Based o...

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5th International Conference on Sensing, Measurement and Data Analytics in the Era of Artificial Intelligence, ICSMD 2024

作者： Xie, Zaimi Mo, Chunmei Jia, Baozhu Naval Architecture and Shipping College Guangdong Ocean University Zhanjiang China Technical Research Center for Ship Intelligence and Safety Engineering of Guangdong Province Zhanjiang China Guangdong Provincial Key Laboratory of Intelligent Equipment for South China Sea Marine Ranching Zhanjiang China College of Electronic and Information Engineering Guangdong Ocean University Zhanjiang China Guangdong Engineering Technology Research Center of Intelligent Ocean Sensor Network and Equipment Zhanjiang China

ISBN: (纸本)9798331529192

Aiming at the health index (HI) is difficult to characterize when the rolling bearing state changes and the transformer network attention mechanism only focuses on the global feature information, resulting in the low prediction performance. This paper proposes a bearing RUL prediction method based on the global-local attention mechanism transformer with a multi-source feature-weighted kernel principal component. Squeeze and excitation networks (SENet) are applied to the adaptive assign weights to its multi-channel features. It combined with the distances of the multi-source features, which were calculated by the Mahalanobis distance (MD), to obtain the multi-source HI through the kernel principal component analysis algorithm (KPCA). It can balance multi-source features and retain important feature information. The global-local attention mechanism transformer method fuse and learn global and local spatiotemporal sequence features can improve bearing RUL prediction model performance. The proposed method was verified by experiments of the XJTU-SY dataset and the PHM2012 dataset and compared with the publicized methods. Results demonstrate the effectiveness and superiority of the proposed approach in terms of prediction accuracy. © 2024 IEEE.

关键词： Roller bearings

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Outage Performance Analysis for RIS-Enabling Full-Duplex Cellular Symbiotic Radio network

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IEEE Transactions on Vehicular technology 2025年

作者： Liang, Zhanqian Han, Shiying Liang, Ying-Chang Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Tianjin300350 China University of Electronic Science and Technology of China Center for Intelligent Networking and Communications Chengdu611731 China

Aiming at breaking through the transmission distance limitation faced by symbiotic radio, in this correspondence, reconfigurable intelligent surface (RIS) is introduced to enable symbiotic transmission within cellular range. To avoid high-cost channel estimation, the phase shifting of the RIS is designed only based on the channel state information of the cascaded backscatter channel which is easy to obtain. Outage probabilities of the backscatter device (BD) and the ambient transmission, both in parasitic and commensal modes, are derived based on Lyapunov's theorem and Hermite-Gauss quadrature. Simulation results illustrate that the BD outage performance is highly sensitive to the number of RIS reflection elements (N) both in parasitic and commensal modes. When N is sufficiently large, its further increment has little impact on the outage probability of the ambient system, although the phase shift is designed merely to enhance the BD transmission. It also offers a guideline in coordinating N with the ambient transmit power to balance between the outage performance of the ambient system and that of the backscatter system. © 1967-2012 IEEE.

关键词： Cellular radio systems

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Design of Intelligent Clothes Hanger System Based on Rainfall Data Analysis 10th

Design of Intelligent Clothes Hanger System Based on Rainfal...

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10th International Conference on Computer engineering and networks, CENet 2020

作者： Tao, Binbin Zhang, Jing Hu, Xusheng Wu, Jingmei Maanshan Engineering Technology Research Center for Wireless Sensor Network and IntelliSense Maanshan243031 China Wanjiang Institute of Technology Maanshan243031 China

ISBN: (纸本)9789811584619

Rainfall plays a vital role in guiding clothes drying. This paper proposes an intelligent clothes hanger system based on the analysis of rainfall data. The system consists of an electric mechanism, weather monitoring module, wireless communication module, central control module, network server, and user APP. The weather data monitored by the local weather monitoring module is uploaded to the network server in real-time, users can monitor and control the clothes hanger through the APP. Besides, the web server constructs a two-dimensional rainfall map based on the weather data provided by the clothes hangers in different geographic locations. Using the weight matrix to perform convolution operation on the rainfall map, the weighted average of the rainfall conditions at any point and its surrounding points is realized. The result is used as the rainfall risk prediction of the area corresponding to this point, used to guide drying. Finally, the feasibility of the algorithm is verified by Labview simulation. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Data handling

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Analysis of Satellite Interference Source Location Algorithm 7

Analysis of Satellite Interference Source Location Algorithm

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7th International Conference on Computer and Communications, ICCC 2021

作者： Yan, Hui Zhao, Laiding Zhang, Gengxin Ruan, Cen 'Telecommunication and Network' National Engineering Research Center Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing China

ISBN: (纸本)9781665409506

There are many methods and principles of satellite interference source location, but no matter which method is chosen, the positioning equation is nonlinear. Therefore, it is very important to solve the nonlinear equations accurately for the accuracy of the final positioning results. In this paper, an improved particle swarm optimization (PSO) algorithm is proposed. Based on the combination of PSO and grid search algorithm, the precision requirement is set in the iterative stop condition. When the calculation results meet the set precision, iteration can be stopped. Compared with the ordinary particle swarm optimization algorithm, the results can be obtained more quickly and accurately. © 2021 IEEE.

关键词： Satellites

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Fusion Algorithm for Foggy Image Enhancement Based on Transmittance Weight Factor 4

Fusion Algorithm for Foggy Image Enhancement Based on Transm...

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4th International Conference on Artificial Intelligence and Big Data, ICAIBD 2021

作者： Sun, Wei Zhang, Meng Wang, Jintao Wanjiang University of Technology Maanshan Wireless Sensor Network and Intelligent Perception Engineering Technology Research Center Maanshan China Wanjiang University of Technology Maanshan China

ISBN: (纸本)9780738131702

Fusion algorithm for foggy image enhancement based on transmittance weight factor is proposed. Firstly, the rough transmittance image of foggy image is obtained by the dark channel prior dehazing algorithm, and then the fine transmittance image is obtained by the guided filter. The dehazing image is obtained by the dark channel prior dehazing method based on the guided filter, and the enhanced image is obtained by histogram equalization based on the HSI color model. Finally, the weight factor is constructed by the fine transmittance, the above dehazing image and enhanced image are processed by weighted fusion. The algorithm gives full play to the respective advantages of two kinds of algorithms in foggy image processing, and significantly improves the fog removal and enhancement effect of foggy image. © 2021 IEEE.

关键词： Image enhancement

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Design of Solar Endurance Control for Unmanned Aerial Vehicles based on Schmidt Trigger Control

Design of Solar Endurance Control for Unmanned Aerial Vehicl...

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2023 Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2023

作者： Hu, Xusheng Liu, Juan Kocheril, Rajesh Ma'Anshan Engineering Technology Research Center for Wireless Sensor Network and IntelliSense Ma'anshan243031 China Anhui Provincial Engineering Laboratory on Information Fusion and Control of Intelligent Robot Wuhu241002 China Ma'Anshan Technical College Ma'anshan243030 China Toc H Institute of Science & Technology APJ Abdul Kalam Technological University Kerala India

In order to improve the endurance of unmanned aerial vehicles (UAVs), a power supply controller with automatic switching between solar energy and battery was designed. The controller is mainly composed of an AT89C51 single chip microcomputer. By collecting ambient light intensity and comparing it with the preset light intensity of the system, the controller completes automatic switching of the power supply for solar unmanned aerial vehicles, thereby achieving continuous and stable power supply for solar unmanned aerial vehicles. In addition, the implementation method of the single-chip microcomputer program in the controller is also introduced. The control core is to use Schmidt de shake control to switch between solar energy and battery, and to test the various functions of the controller through the flight experiment of a small solar powered unmanned aerial vehicle. Tests have found that solar powered drones using this controller can navigate for a long time in weather with varying light intensity, and the device operates well, effectively improving the power stability of solar powered drones. © Published under licence by IOP Publishing Ltd.

关键词： Controllers

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Power Quality Disturbances Classification Based on WOA-SVM Algorithm

Power Quality Disturbances Classification Based on WOA-SVM A...

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Power Energy Systems and Applications (ICoPESA), International Conference on

作者： Ping Ji Quan Zhu Maanshan Wireless Sensor Network and Intelligent Perception Engineering Technology Research Center Maanshan China Wanjiang University of Technology Maanshan China Maanshan University Maanshan China

With the rapid development of new energy technology, all kinds of distributed power grids are connected to the main power grid, generating a large number of complex disturbance signals. In order to ensure the safety of the power grid and solve the difficult problem of power grid disturbance identification, this paper proposes a classification recognition algorithm based on the combination of energy difference (ED) and support vector machine (SVM) optimized by the Whale optimization algorithm (WOA). Firstly, the disturbance signal is decomposed with multi-resolution, and the energy difference of each layer is calculated as the characteristic quantity of the disturbance signal. Then, WOA algorithm was used to optimize SVM, and the optimal solutions of penalty parameters and kernel parameters were obtained. Finally, the feature vector is input into the WOA-SVM model, and the output disturbance signal type is automatically identified. Experimental results show that this method can accurately identify single and complex disturbance signals. In the noise environment, it shows strong robustness. The overall recognition rate of ED-WOA-SVM is over 99%.

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Research and Design of Frequency Quadrupler Based on CMOS 1

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11th International Conference on Communications, Signal Processing, and Systems, CSPS 2022

作者： Wang, Hai Wang, Zhihong Sun, Guiling Jiang, Xiaomei Bi, Chaoran Zhang, Ying Teaching Center for Experimental Electronic Information College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Department of Electronic Information Science and Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China College of Media Design Tianjin Modern Vocational Technology College Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300071 China

ISBN: (数字)9789819926534

ISBN: (纸本)9789819926527

With the continuous development of wireless communication technology, the public has an increasingly strong demand for modern communication systems with better performance. As a vital component of RF front-end circuit, frequency multiplier is usually applied in the transmitter to generate high-frequency signal. CMOS integrated circuit, with the advantages of high integration, small volume and low cost, is widely used in communication, radar, civil, military and other fields. This paper focuses on the operating principle of frequency multiplier and the design method of triode frequency multiplier. Based on CMOS technology, a quadrupler with 4GHz output frequency is designed with ADS simulation software after debugging and optimization, which is applied to undergraduate teaching of professional experiment of electronic information science and technology. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： CMOS integrated circuits

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Long-term ultra-precision phase synchronization technique for locking the repetition rate of OFCs based on FLOM-PD

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Optoelectronics Letters 2022年第12期18卷 712-716页

作者： ZHOU Weifeng HAO Shijie CHEN Xing ZHANG Wanpeng YUE Zongjie WU Hong College of Electronic Information and Optical Engineering Nankai UniversityTianjin300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai UniversityTianjin300350China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing100876China Engineering Research Center of Thin Film Optoelectronics Technology Nankai UniversityTianjin300350China

Long-term ultra-precision synchronization between optical frequency combs(OFCs) and microwave oscillators is important for various fields, including scientific observation, smart grid, positioning and navigation, etc. Here, a phase-locked loop system based on fiber loop optical-microwave phase detector(FLOM-PD) is proposed to realize the synchronization of the repetition rate of OFCs and rubidium atomic clocks. Firstly, the scheme and locking process of the system are elaborated, then the mathematical model of the system is established, and the feasibility of the scheme is proved by theoretical analysis and experimental verification. After synchronization, the instability of the system reaches 8.69×10^(-12)at 1 s and 2.94×10^(-13)at 1 000 s, indicating that the phase synchronization system can achieve ultra-precision and stability of OFCs repetition rate.

关键词： synchronization repetition phase

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Simulation Design of a Low Noise Amplifier with 2.5 GHz Operating Frequency 1

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11th International Conference on Communications, Signal Processing, and Systems, CSPS 2022

作者： Wang, Hai Sun, Guiling Wang, Zhihong Zhang, Yi Jiang, Xiaomei Zhang, Ying Teaching Center for Experimental Electronic Information College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Department of Electronic Information Science and Technology College of Electronic Information and Optical Engineering Nankai University Tianjin300350 China Institute of Photoelectronic Thin Film Devices and Technology and Tianjin Key Laboratory of Thin Film Devices and Technology Nankai University Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin300071 China

ISBN: (数字)9789819926534

ISBN: (纸本)9789819926527

Nowadays the wireless communication infrastructure industry is facing with a number of great challenges, such as providing better signal quality and wider coverage in a crowded spectrum. Low noise amplifier (LNA), a significant component of communication system, plays an important role in modern wireless communication, radar, electronic countermeasure system between countries and so on. The sensitivity performance of the base station receiver can be dramatically improved by a suitable amplifier, especially the first stage LNA. In this paper, a low noise amplifier with an operating frequency of 2.5 GHz is designed with the help of the simulation software. The minimum values of input return loss S11 and output return loss S22 are −19.232 dB and −29.422 dB respectively. The maximum gain is 14.567 dB at the center frequency. Besides, the stability coefficient K is greater than 1 and the noise figure (NF) is 0.662 dB. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Low noise amplifiers

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