检索结果-内蒙古大学图书馆

Condition-Based Spare Ordering Model for a Two-Stage Degrading System

Journal of Systems Science and Systems engineering 2020年第1期29卷 85-99页

作者： Cheng Wang Jianxin Xu Zhenming Zhang Hongjun Wang School of Mechanical Engineering Xi'an Aeronautical UniversityXi'an 710077China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Key Laboratory of Modern Measurement and Control Technology Ministry of EducationBeijing Information Science and Technology UniversityBeijing 100192China

Proper supply of spares is critical to guarantee safe operation,improve service quality and reduce maintenance *** paper proposes a condition-based spare ordering model for a two-stage degrading system,which consists of inflection point transfer process and two-stage degradation process with continuous degradation process and random external *** shocks itself does not directly lead to system failure,but it will speed up the degradation *** turn,degradation can also make the system more vulnerable to *** general,the degradation rate at the defective stage is greater than that at the normal *** proposed model depends on system degradation process and spare *** order to achieve accurate maintenance and deal with emergency maintenance caused by system rapid degradation after inflection point transfer time,the model considers both the regular lead-time and expedited *** inflection point transfer time,regular spare ordering policy is *** inflection point transfer time,expedited spare ordering policy is *** decision variable of the model is the ordering *** objective of this study is to determine the optimal ordering time such that the expected cost rate is ***,a numerical example is presented to illustrate the proposed model and sensitivity analysis on critical parameters is carried out.

关键词： Condition-based spare ordering inflection point two-stage degradation random external shocks random lead-time

来源：评论

学校读者我要写书评

暂无评论

Interpretable DRL-based Maneuver Decision of UCAV Dogfight

arXiv

引用

arXiv 2024年

作者： Han, Haoran Cheng, Jian Lv, Maolong School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu611731 China Air Traffic Control and Navigation College Air Force Engineering University Xi’an710051 China College of Aeronautics Engineering Air Force Engineering University Xi’an710038 China

This paper proposes a three-layer unmanned combat aerial vehicle (UCAV) dogfight frame where Deep reinforcement learning (DRL) is responsible for high-level maneuver decision. A four-channel low-level control law is firstly constructed, followed by a library containing eight basic flight maneuvers (BFMs). Double deep Q network (DDQN) is applied for BFM selection in UCAV dogfight, where the opponent strategy during the training process is constructed with DT. Our simulation result shows that, the agent can achieve a win rate of 85.75% against the DT strategy, and positive results when facing various unseen opponents. Based on the proposed frame, interpretability of the DRL-based dogfight is significantly improved. The agent performs yo-yo to adjust its turn rate and gain higher maneuverability. Emergence of"Dive and Chase" behavior also indicates the agent can generate a novel tactic that utilizes the drawback of its opponent. © 2024, CC0.

关键词： Reinforcement learning

来源：评论

学校读者我要写书评

暂无评论

Transformer based Online Continuous Multi-Target Tracking with State Regression

Transformer based Online Continuous Multi-Target Tracking wi...

引用

International Conference on control, Automation and Information Sciences (ICCAIS)

作者： Xinwei Wei Linxiu Chen Chenyu Zhang Yiru Lin Linao Zhang Xiaokai Liu Jixiang Jiang Wei Yi School of Information and Communication Engineering University of Electronic Science and Technology of China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Research Institute of Electronic Science and Technology University of Electronic Science and Technology of China

Multi-target Tracking (MTT) is the process of processing received measurements to maintain estimates of the current status of multiple targets, with important applications to autonomous driving, aerial reconnaissance, underwater operations, and others. In the model-based setting, Bayesian filtering can provide the theoretical optimal estimate in a single target scenario. However, in complex situations, uncertain factors such as changes in the number of targets will cause the amount of calculation to increase exponentially, resulting in a decline in tracking accuracy. To solve that problem, model-free methods based on deep-learning provide an attractive alternative, especially the state-of-the-art architecture Transformer based encoder-decoder prediction model, which outperforms the Bayesian filters in the single frame prediction tasks. However, when switching to continuous tracking, these algorithms need to be trained separately frame by frame to adapt to the new tasks. Still, there is no correlation between their predictions from different frames, which prevents them from fully utilizing all the measurements. In this paper, we propose an end-to-end Transformer based MTT method with state autoregression, which allows the model to have the capability of online continuous tracking and make total use of the entire trajectory. The results show that the proposed model is a great extension from single-frame prediction to online continuous tracking.

关键词：

来源：评论

学校读者我要写书评

暂无评论

User Cooperative Receiving Scheme of Misaligned OAM Signals for UAV Emergency communications

User Cooperative Receiving Scheme of Misaligned OAM Signals ...

引用

International Conference on Electronics Information and Emergency communication

作者： Yanguo Zhou Ruirui Chen Keyue Xu Rui Feng Jicun Ding Jinyang Lin National Engineering Laboratory for Risk Perception and Prevention China Academy of Electronics and Information Technology Beijing China School of Information and Control Engineering China University of Mining and Technology Xuzhou China State Key Laboratory of Dynamic Measurement Technology North University of China Taiyuan China Xuzhou First Peoples Hospital Xuzhou China

ISBN: (数字)9798350361896

ISBN: (纸本)9798350361902

For the massive users in post-disaster scenario, unmanned aerial vehicle (UAV) can rapidly establish emergency communications, and orbital angular momentum (OAM) can significantly improve spectrum efficiency (SE). Due to hollow divergence and alignment requirement, it is hard for users to receive OAM signals by using antenna-limited devices. For UAV emergency communications with line-of-sight link, we propose the user cooperative receiving (UCR) scheme, which can realize 2 OAM mode multiplexing communications for users at long distance. Two cooperative users (CUs) are chosen, and the waist radius is adjusted to guarantee the maximum intensity at two CUs. The OAM beam steering is designed to eliminate the inter-mode interference of misaligned OAM signals caused by the antenna misalignment. Simulation results demonstrate that the proposed UCR scheme can obtain higher SE than the traditional scheme due to the effective reception of misaligned OAM signals for UAV emergency communications.

关键词： Multiplexing Orbital calculations Beam steering Simulation Receiving antennas Line-of-sight propagation Interference

来源：评论

学校读者我要写书评

暂无评论

Color Image Encryption Based on Interferenceless Coded Aperture Correlation Holography Polarization Imaging

SSRN

引用

SSRN 2024年

作者： Yu, Xuelian Li, Jia Qi, Zhongcai Zhang, Huifeng Niu, Jia Sun, Yanqian Li, Xiufang Qu, Bo Heilongjiang Provincial Key Laboratory of Quantum Control School of Measurement and Communication Engineering Harbin University of Science and Technology Harbin150080 China Shanxi Key Laboratory of Quantum Information and Quantum Optoelectronic Devices School of Physics Xi’an Jiaotong University Xi’an710049 China Daheng New Epoch Technology Inc. Beijing100085 China Harbin Xinguang Optics-Electronics Technology Co. Ltd. Harbin150028 China

A color image encryption scheme is proposed, which employs the interferenceless coded aperture correlation holography (I-COACH) system in conjunction with polarization encoding. This method encrypts all three channels of an RGB image into a single ciphertext, effectively reducing the correlation between channels and improving the efficiency of encryption. By leveraging the inherent advantages of the I-COACH system, particularly its high-dimensional signal processing capabilities and incorporation of polarization information, this innovative approach simplifies the encryption process while demonstrating superior performance in terms of encryption feasibility, security, and robustness. Ultimately, it provides an efficient and highly secure means for transmitting color images. © 2024, The Authors. All rights reserved.

关键词： Image correlation

来源：评论

学校读者我要写书评

暂无评论

Research on Methodology for Digital Twin Construction of Powertrain Systems Under Time-Varying Conditions

SSRN

引用

SSRN 2024年

作者： Zhang, Dingge Ma, Biao Yu, Liang Xu, Xiaoyu Wang, Liyong Zhang, Jinle School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China School of Software Shandong University Shandong250101 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China China North Vehicle Research Institute Beijing100072 China

The dynamic characteristic investigation of powertrain system under time-varying conditions is highly relied on the dynamic torque signals of each component. However, methods that are sufficiently stable and efficient for obtaining these torque signals have not yet been realized. Thus, a five-dimensional digital twin system, including mechanism, behavior, geometric, statistical, and self-learning models, is established as a virtual mapping of physical system. These models are used to define solution methods, quantify characteristics, visualize displays, statistical analysis, and predict states, respectively. Then, a digital twin monitoring platform is established based on the virtual-real mapping, which can visualize dynamic characteristics of each component based on MQTT protocol. Moreover, the twin signals are verified from the perspectives of dynamics and kinematics through bench and real vehicle experiments, where the relative errors are less than 10%. In addition to the dynamic speed-torque signals of each component, twin signals also include jerk and sliding friction work used to evaluate the shifting quality. Through specific examples, it is demonstrated that the operating state for powertrain system can be monitored and evaluated based on all these twin signals, thus providing sufficient data support for further decision-making and feedback. © 2024, The Authors. All rights reserved.

关键词： Mapping

来源：评论

学校读者我要写书评

暂无评论

A Novel Microwave Humidity Sensor Based on a Complementary Interdigital Capacitor Resonator

SSRN

引用

SSRN 2024年

作者： Wang, Litian Chen, Jie Li, Dan Qian, Lirong Xiong, Yang Miao, Lin Zhang, Rong Li, Cuiping Tianjin Key Laboratory of Film Electronic and Communication Devices School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin300384 China School of Integrated Circuit Science and Engineering Tianjin University of Technology Tianjin300384 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Resonant for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China

This study presents a novel microwave humidity sensor that utilizes a complementary interdigital capacitor resonator (CIDCR), an advanced design derived from the traditional complementary split ring resonator (CSRR) structure. The CIDCR design enhances the sensor's performance by concentrating the electric field in a more compact region, leading to improved sensitivity and miniaturization. The sensor is coated with a composite film of chitosan (CS) and polyacrylamide-glycerol (PAMG), combining the high moisture sensitivity of PAMG with the stability of CS. The CIDCR-based sensor demonstrates superior performance, including high sensitivity, a broad detection range, rapid response/recovery times, and excellent long-term stability. Density functional theory (DFT) calculations further elucidate the moisture-sensitive mechanisms at the molecular level, highlighting the role of hydrogen bonding in the composite film. Application tests confirm the sensor's potential for use in respiratory monitoring, non-contact sensing, and health monitoring, showcasing the advantages of the CIDCR structure in achieving enhanced humidity sensing capabilities. © 2024, The Authors. All rights reserved.

关键词： Humidity sensors

来源：评论

学校读者我要写书评

暂无评论

Optimal Operation Strategy of Energy Storage System Considering Wind Uncertainty and Power Market 5

Optimal Operation Strategy of Energy Storage System Consider...

引用

5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Ji, Meiqin Du, Xinhui Gong, Tiangang Yin, Jiahui Yang, XiaoXi Tian, Shuang Wu, Yingying Yuan, Hesheng School of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China General Manager's Office Shanxi Fengxing Measurement and Control Co. Ltd Taiyuan China

ISBN: (纸本)9781665434256

Considering the uncertainty of wind power output and the market price of electric energy and frequency modulation auxiliary services, a model is established. The established model adopts a two-stage collaborative operation optimization method. The first stage aims to maximize wind power consumption and lowest cost, and the second stage aims to maximize the profitability of idle energy storage system under the energy market and frequency regulation market. The proposed strategy is obtained through the analysis of the calculation example. The energy storage system not only reduces the fluctuation of new energy and improves the dispatchability and absorption capacity of wind power, but also can increase the operating income in the environment of the energy market and ancillary service. Especially when the price of frequency regulation market is high, it has good economic benefits and reduces the cost recovery period of investment in the energy storage system. © 2021 IEEE

关键词： Wind power

来源：评论

学校读者我要写书评

暂无评论

Hot Spot Detection of Photovoltaic Module Infrared Near-field Image based on Convolutional Neural Network 4

Hot Spot Detection of Photovoltaic Module Infrared Near-fiel...

引用

2022 4th International Conference on Energy Systems and Electrical Power, ICESEP 2022

作者： Fan, Fu Na, ZhiXiong Zhang, ChangZhi Li, HaoRan Tong, ChaoLiu School of Computer Science and Technology Beijing Institute of Technology Beijing100081 China State Grid e-commerce Co. Ltd Beijing100053 China State Grid Tianjin Electric Power Company Tianjin300010 China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation Southeast University Nanjing210096 China

With the installation and use of large-scale photovoltaic systems around the world, the detection of photovoltaic system operation and maintenance has become increasingly important. This research uses a convolutional neural network training model to detect and classify the infrared near-field images of photovoltaic modules from small-scale photovoltaic plants in the laboratory. This model classifies the images into two categories: with and without hot spots, with a classification accuracy of 96.58%. The experimental results show that the convolutional neural network training model has a good classification result. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

TOPSIS Power Quality Comprehensive Assessment Based on A Combination Weighting Method 5

TOPSIS Power Quality Comprehensive Assessment Based on A Com...

引用

5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

作者： Yin, Jiahui Du, Xinhui Yuan, Hesheng Ji, Meiqin Yang, Xiaoxi Tian, Shuang Wang, Qianchun Liang, Yaojun School of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China General Manager's Office Shanxi Fengxing Measurement and Control Co.Ltd Taiyuan China

ISBN: (纸本)9781665434256

In order to better perform operation and planning of active distribution system under the background of high penetration rate of new energy, this paper studies power quality assessment and proposes a method named TOPSIS based on the combination of AHP-CRITIC-EWM. First of all, considering the actual situation, the difference and relevance between power quality indicators, and the degree of dispersion of the evaluation data, the analytic hierarchy process (AHP) is used to determine the subjective weight of the indicators, and the criteria importance through intercriteria correlation (CRITIC) and the entropy weight method (EWM) are combined to determine the objective weight of the *** the goal of the subjective and objective weights tending to be consistent, the minimum deviation combination weight model is established. Secondly, the index weights are integrated into the TOPSIS assessment method to meet the actual requirements of different indexes with different importance levels, and the assessment objects are quantified and graded. Finally, a case study is carried out, and the results show that the comprehensive assessment method proposed is effective and feasible. © 2021 IEEE

关键词： Power quality

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：