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基于VAE-DRSN的微纳卫星推力器故障诊断方法

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航天器工程 2024年第2期33卷 76-83页

作者：朱劲锟郑侃梁振华唐嘉程南京理工大学机械工程学院南京210094

针对微纳卫星推力器故障诊断问题,提出了一种基于变分自编码器-深度残差收缩网络(VAE-DRSN)的数据驱动推进系统故障诊断方法。该方法采用变分自编码器对姿态数据与控制器输出进行特征提取,通过深度残差收缩神经网络对提取的特征进行特... 详细信息

针对微纳卫星推力器故障诊断问题,提出了一种基于变分自编码器-深度残差收缩网络(VAE-DRSN)的数据驱动推进系统故障诊断方法。该方法采用变分自编码器对姿态数据与控制器输出进行特征提取,通过深度残差收缩神经网络对提取的特征进行特征分类,可以高精度地在线检测、诊断和定位推力器的卡开、卡关及效率降低故障,无需卫星推力器模型及动力学模型,且无需单独配备硬件测量机构。经数值仿真验证,结果表明:该方法对于单喷口故障检测正确率可达99%以上,具有良好推力器故障定位及诊断能力。

关键词：微纳卫星故障诊断深度学习变分自编码器推力器故障

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一种小型无人机飞行控制及图像传输系统设计研究

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郑州航空工业管理学院学报 2024年第2期42卷 58-64页

作者：李玲唐嘉成谭皓琳郑州航空工业管理学院自动化学院河南郑州450046 杭州智控网络有限公司浙江杭州310000

文章设计了无人机的飞行控制及图像传输,将PID算法和飞行控制的公式相结合,建立更平稳的飞行控制模型。采用功能较为强大的STM32F4系列单片机作为中心处理器进行设计,分模块分平台来模拟实现无人机的飞行控制、图像采集和图像传输等功... 详细信息

文章设计了无人机的飞行控制及图像传输,将PID算法和飞行控制的公式相结合,建立更平稳的飞行控制模型。采用功能较为强大的STM32F4系列单片机作为中心处理器进行设计,分模块分平台来模拟实现无人机的飞行控制、图像采集和图像传输等功能。不仅可以增加飞行拍摄稳定性,也可以为跨平台飞行摄像传输提供参考。

关键词：飞行控制图像传输 STM32单片机 ESP32-CAM

A Novel Improved Bat Algorithm in UAV Path Planning

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Computers, Materials & Continua 2019年第7期61卷 323-344页

作者： Na Lin jiacheng tang Xianwei Li Liang Zhao School of computer science Shenyang Aerospace UniversityShenyang110000China School of Information Engineering Suzhou UniversitySuzhou215000China Global Information and Telecommunication Institute Waseda UniversityTokyo169-0051Japan

Path planning algorithm is the key point to UAV path planning *** traditional path planning methods still suffer from low convergence rate and insufficient *** this paper,three main methods are contributed to solving these ***,the improved artificial potential field(APF)method is adopted to accelerate the convergence process of the bat’s position ***,the optimal success rate strategy is proposed to improve the adaptive inertia weight of bat *** chaos strategy is proposed to avoid falling into a local *** with standard APF and chaos strategy in UAV path planning scenarios,the improved algorithm CPFIBA(The improved artificial potential field method combined with chaotic bat algorithm,CPFIBA)significantly increases the success rate of finding suitable planning path and decrease the convergence *** results show that the proposed algorithm also has great robustness for processing with path planning ***,it overcomes the shortcomings of the traditional meta-heuristic algorithms,as their convergence process is the potential to fall into a local *** the simulation,we can see also obverse that the proposed CPFIBA provides better performance than BA and DEBA in problems of UAV path planning.

关键词： UAV path planning bat algorithm the optimal success rate strategy the APF method chaos strategy

Decorin accelerates the liver regeneration after partial hepatectomy in fibrotic mice

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Chinese Medical Journal 2014年第14期127卷 2679-2685页

作者： Ma Rui Chen Jiang Li Zheyong tang jiacheng Wang Yifan Cai Xiujun Zhejiang Univ Dept Gen Surg Sir Run Run Shaw Hosp Coll Med Hangzhou 310016 Zhejiang Peoples R China Zhejiang Univ Inst Minimally Invas Surg Hangzhou 310016 Zhejiang Peoples R China

Background Considering the existence of a large number of liver cell degeneration and necrosis in fibrotic liver, liver function was damaged severely and could not effectively regenerate after partial hepatectomy （PHx）. The aim of this study was to investigate whether decorin （DCN） could promote the liver regeneration after PHx in fibrotic mice. Methods Forty mice （5-week-old, Balb/c） were injected with CCI4 intraperitoneally and liver fibrosis model was established after 5 weeks. The survival mice were randomly divided into two groups： control group and DCN group. Then, we performed 70% PHx on all these mice and injected DCN or phosphate-buffered saline plus normal saline （NS） to each group, respectively, after surgery. Liver body weight ratio （LBR）, quantitative real-time polymerase chain reaction, and immunohistochemistry were used to analyze liver regeneration and fibrosis degree in both groups, and to find out whether exogenous protein DCN could promote the regeneration of fibrosis liver after PHx. Results Expressions of a-smooth muscle actin （SMA） mRNA and LBR had significant increases in the DCN group at postoperative Day 3 （POD 3, P〈0.05）. The protein expressions of CD31, a-SMA, and tumor necrosis factor （TNF）-a were higher in the DCN group than those in the control group by immunohistochemistry at POD 3 （P〈0.05）. Conclusion Exogenous protein DCN could promote liver regeneration after PHx in fibrotic mice. Chin Med J 2014;127 （14）： 2679-2685

关键词： decorin liverfibrosis hepatectomy regeneration transforming growth factors

Comparison of Wide-bandgap Devices in 1 kV,3 kW LLC Converters

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Chinese Journal of Electrical Engineering 2020年第3期6卷 65-72页

作者： Zhanbiao Gu jiacheng tang Wenming Zhu Kaiqi Yao Zhesi Gao Weijie Shi Zhiliang Zhang Xiaoyong Ren Hebei Semiconductor Research Institute Shijiazhuang 050051China Aero-Power Sci-Tech Center Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Emerging wide-bandgap(WBG)devices,such as silicon carbide(SiC)MOSFETs and gallium nitride(GaN)high-electron-mobility transistors(HEMTs)provide new opportunities to realize high efficiency,high power density,and high reliability in several kHz,1 kV input,and several kW output ***,the performance comparison between SiC MOSFETs and GaN HEMTs in high-voltage,high-frequency,medium-high-power DC conversion applications have not yet been investigated *** 1 kV,3 kW LLC prototypes with GaN and SiC devices are built to perform a careful comparison of the prototypes in terms of parameters,power density,zero voltage switch realization,and overall *** provides guidance for the appropriate evaluation of WBG devices in high-voltage,high-frequency,and medium-high-power applications.

关键词： Wide-bandgap devices application high voltage medium-high power

Interleaved-Connected Split Planar Resonant Inductor Design in 1 kV SiC LLC Converters

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第5期36卷 715-723页

作者： tang jiacheng YAO Kaiqi ZHU Wenming GAO Zhesi XU Zhiwei ZHANG Zhiliang REN Xiaoyong CHEN Qianhong Aero-Power Sci-Tech Center College of Automation EngineeringNanjing University of Aeronautics and Astronautics

Design method of split planar resonant inductor in 1 kV SiC logical link control(LLC)converter is proposed,which ensures the converter power density of 93.59 W/in^3 and peak efficiency of 95.73%.Split resonant inductor helps to provide symmetrical resonant current by symmetrical impedance,and improves the distortion of resonant current,which ensures the efficiency of the whole *** interleaved winding connecting scheme improves the power density of the planar magnets,which contributes to power density *** method and calculation process of such split planar resonant inductor are *** verify the feasibility of the proposed design method,a 1 kV/48 V 6.6 kW,210 k Hz SiC LLC prototype was built,and the experimental results are given.

关键词： SiC LLC converter split resonant tank design method interleaved winding connecting scheme

Multi-objective vehicle rebalancing for ridehailing system using a reinforcement learning approach

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Journal of Management Science and Engineering 2022年第2期7卷 346-364页

作者： Yuntian Deng Hao Chen Shiping Shao jiacheng tang Jianzong Pi Abhishek Gupta Department of Electrical and Computer Engineering The Ohio State UniversityColumbusOH43210USA

The problem of designing a rebalancing algorithm for a large-scale ridehailing system with asymmetric(unbalanced)demand is considered *** pose the rebalancing problem within a semi Markov decision problem(SMDP)framework with closed queues of vehicles serving stationary,but asymmetric demand,over a large city with multiple stations(representing neighborhoods).We assume that the passengers queue up at every station until they are matched with a *** goal of the SMDP is to minimize a convex combination of the waiting time of the passengers and the total empty vehicle miles *** resulting SMDP appears to be difficult to solve yielding closed-form expression for the optimal rebalancing ***,we use a deep reinforcement learning algorithm to determine the approximately optimal solution to the *** show through extensive Monte Carlo simulations that the trained policy outperforms other well-known state-dependent rebalancing strategies.

关键词： Reinforcement learning Ridehailing system Multi-objective optimization

A Fine Anti-Noise Algorithm Based on Matrix Block Variational Estimation in Underwater Navigation

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A Fine Anti-Noise Algorithm Based on Matrix Block Variationa...

Magnetometer Error Compensation Algorithm Based on Improved Particle Swarm Optimization Algorithm

第40届中国控制会议

作者： Haoqian Huang jiacheng tang Bing Wang Guanghui Li Yiming Han Hohai University

Autonomous underwater vehicle(AUV) has been widespread to oceanography applications based on a reliable *** complex underwater environment leads to more velocity measurement errors of AUV,so it is difficult to determine the accurate navigation and positioning *** solve the problem of non-Gaussian noise in the underwater navigation,this paper proposes an anti-noises algorithm based on matrix block variational estimation(AN-MBVE) *** matrix block method is used to divide the measurement noises into two parts:Gaussian noises,and non-Gaussian ***,the accurate measurement noise is estimated by using the variational estimation *** state vector and the error covariance matrix are derived by using the precise measurement *** results demonstrate the superiority of the proposed AN-MBVE compared with the traditional extended Kalman filter under the condition of the complex noises.

关键词： Non-Gaussian noise variational estimation method underwater navigation position estimation matrix block method

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Magnetometer Error Compensation Algorithm Based on Improved ...