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A robust three-dimensional cooperative guidance law against maneuvering target ?

JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS 2020年第10期357卷 5735-5752页

作者： Wang, Chunyan Ding, Xiangjun Wang, Jianan Shan, Jiayuan Beijing Inst Technol Beijing 100081 Peoples R China

This paper proposes a robust three-dimensional cooperative guidance law (RTCGL) against a maneuvering target. When some missiles are intercepted during the engagement, this RTCGL integrated with a local filtering algorithm can ensure that the rest missiles hit the maneuvering target simultaneously. The pitch acceleration command is designed based on an augmented proportional navigation guidance law and can make the missile’s trajectory fall into its yaw plane. Then the three-dimensional cooperative problem is converted into a planar one. The yaw acceleration command consists of a guidance component for homing and a coordination component for simultaneous arrival. Numerical simulation results are presented to verify the effectiveness of the cooperative guidance law.

关键词： Cooperative guidance law local filtering algorithm maneuvering target distributed structure

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Development and fault-tolerant control of a distributed piezoelectric stack actuator

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SMART MATERIALS AND structureS 2024年第9期33卷 095003-095003页

作者： Zhang, Yunzhi Ling, Jie Zhu, Yuchuan Nanjing Univ Aeronaut & Astronaut Coll Mech & Elect Engn Nanjing Peoples R China

Piezoelectric stack actuator (PSA) has attracted widespread attention in aerospace applications. However, the severe operating conditions would bring certain risks to PSA, leading to decreased performance or even failure. The conventional PSA structure lacks adaptability in the event of a complete failure occurring within the piezoelectric stack layer (PSL) due to its centralized design and driving method. To address the reliability challenges inherent in PSAs, this paper proposes a novel distributed PSA (DPSA) by means of mechanical and electrical dispersion. Additionally, dual-redundant PSLs are integrated into the DPSA as backups, providing hardware redundancy for active fault-tolerant control (FTC). Building upon this foundation, an sliding mode observer (SMO)-based fault detector for DPSA is developed to facilitate fault reconstruction. Subsequently, an active FTC strategy, comprising dual-SMO-based fault detectors and a tracking controller, is introduced to effectively manage faults and reallocate control resources. Comprehensive experiments under various fault scenarios are carried out to assess the performance of the SMO-based fault detector and FTC strategy. The results demonstrate that the proposed fault detector and FTC strategy promptly detect faults and efficiently restore the DPSA to a stable state, thereby ensuring effective trajectory tracking even in the presence of faults.

关键词： piezoelectric stack distributed structure fault detection fault-tolerant control high reliability

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A data-driven distributed and easy-to-transfer method for short-term voltage stability assessment

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2022年 139卷 107960-107960页

作者： Cai, Huaxiang Hill, David J. Univ Hong Kong Dept Elect & Elect Engn Hong Kong Peoples R China

In this paper, a novel data-driven method named Gated Recurrent Graph Attention Network (GRGAT) for STVS assessment is developed by learning the relationship between system dynamics during faults and the corresponding transient voltage security index (TVSI). GRGAT can capture the spatial-temporal correlation in the power system, because the attention operations of bus information are performed directly on the system topology and the system dynamics are captured with gated recurrent units. Particularly, all operations are independent between buses. Therefore, GRGAT is not only distributed during online application, but also easy-to-transfer, which can adapt to the change of topological structures. To show the feasibility, adversarial adaptation is adopted to transfer learned knowledge for another modified network. The effectiveness and efficiency of GRGAT are demonstrated on the New England 10-Generator-39-Bus system and its modified systems. Simulation results also show the potential of this learning technique in knowledge transfer.

关键词： Short-term voltage stability Graph attention Gated recurrent unit distributed structure Knowledge transfer Adversarial adaptation

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distributed Instrument Failure Detection, Estimation and Isolation for Linear Time-Varying Process

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IFAC Proceedings Volumes 1988年第19期21卷 257-262页

作者： T. Cecchin D. Sauter J. Merckle M. Aubrun Laboratoire d'Automatujue et de Recherche Appliquée Centre de Recherche en Automatique de Nancy LARA CRAN UA CNRS 821 Université de Nancy I INPL Isial BP 239 54506 Vandoeuvre Cedex France

In most cases, failure detection methods are based on the use of analytical redundancy. This suppose that a reference model, wich described the normal behaviour of the process, is known. Classical methods are not suitable when the process is a large-scale time-varying system. In this paper we present a distributed failure detection, estimation and isolation scheme wich allows to detect systematic errors (bias, drift) in time-varying process. The proposed method involves two levels : - a local level : each subsystem parameters are determined by use of a bias and drift-free identification method. Multiple hypothesis tests are applied on the prediction error obtained with identified parameters in order to detect failures and estimate their magnitudes. - a global level : each local failure informations are centralized and a structural method is used to isolate instrument failures . An example is indued to illustrate the presented method.

关键词： Instrument failure detection analytical redundancy linear time-varying process failure estimation distributed structure

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Information-based massive data retrieval method based on distributed decision tree algorithm

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INTERNATIONAL JOURNAL OF MODELING SIMULATION AND SCIENTIFIC COMPUTING 2023年第1期14卷

作者： Chen, Bin Chen, Qingming Ye, Peishan China Southern Power Grid Co Ltd Guangzhou 510663 Guangdong Peoples R China China Southern Power Grid Digital Media Technol C Guangzhou 510060 Guangdong Peoples R China

Based on the distributed decision tree algorithm, this paper first proposes a method of vertically partitioning datasets and synchronously updating the hash table to establish an information-based mass data retrieval method in a heterogeneous distributed environment, as well as using interval segmentation and interval filtering technologies for improved algorithm of distributed decision tree. The distributed decision tree algorithm uses the attribute histogram data structure to merge the category list into each attribute list, reducing the amount of data that needs to reside in the memory. Second, we adopt the strategy of vertically dividing the dataset and synchronously updating the hash table, select the hash table entries that can be used to update according to the minimum Gini value, modify the corresponding entries and use the hash table to record and control each sub-site. In the case of node splitting, it has a high accuracy rate. In addition, for classification problems that meet monotonic constraints in a distributed environment, this paper will extend the idea of building a monotonic decision tree in a distributed environment, supplementing the distributed decision tree algorithm, adding a modification rule and modifying the generated nonmonotonic decision tree to monotonicity. In order to solve the high load problem of the privacy-protected data stream classification mining algorithm under a single node, a Storm platform for the parallel algorithm PPFDT_P based on the distributed decision tree algorithm is designed and implemented. At the same time, considering that the word vector model improves the deep representation of features and solves the problem of feature high-dimensional sparseness, and the iterative decision tree algorithm GBDT model is more suitable for non-high-dimensional dense features, the iterative decision tree algorithm will be integrated into the word vector model (GBDT) in the data retrieval application, using the distributed represe

关键词： distributed structure decision tree algorithm informationized data retrieval method

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Used-Battery Management with Integrated Battery Building Block System 30

Used-Battery Management with Integrated Battery Building Blo...

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30th Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

作者： Li, Ye Han, Yehui Univ Wisconsin Dept Elect & Comp Engn 1415 Johnson Dr Madison WI 53706 USA

ISBN: (纸本)9781479967353

This paper utilizes an integrated building block system to manage battery packs made up of battery cells retired from transportation applications. These used batteries could have different brands, capacities, chemistries, aging conditions, etc. The importance of the second use of the retired batteries is addressed and an integrated building block system is introduced in this paper. The control strategy for handling used batteries is also proposed. A prototype is built and the concept is verified by experimental results.

关键词： Used Batteries Battery Management Battery Building Block distributed structure Power Electronics Integration

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50-dB Attenuation Range 3-bit Low Insertion Loss Ku-Band and Ka-Band 100nm GaAs Digital Step Attenuators 10

50-dB Attenuation Range 3-bit Low Insertion Loss Ku-Band and...

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10th IEEE International Conference on Communications and Electronics (IEEE ICCE)

作者： Tien Bui Nam Nguyen Lee, Sanghun Cuong Huynh Ho Chi Minh City Univ Technol Fac Elect & Elect Engn VNU HCM Ho Chi Minh City Vietnam WAVEPIA Co Ltd Hwaseong Si South Korea

ISBN: (纸本)9798350379808;9798350379792

This paper presents 50-dB attenuation range low insertion loss 100nm Gallium Arsenide (GaAs) digital step attenuators at the Ku-band and Ka-band. The distributed type, combined with parallel RC compensation and reduced-size quarterwavelength techniques, is utilized to achieve low insertion loss, good attenuation, and phase error. Specifically, the 14-18 GHz DSA exhibits an insertion loss of less than 4.8 dB and a Root-Mean-Square (RMS) amplitude error of 0.72 dB. Similarly, the 34-37 GHz DSA achieves an insertion loss of under 6.4 dB and RMS amplitude error of 1.14 dB. The output third-order intercept point (OIP3) of both designs is approximately 40 dBm.

关键词： Digital step attenuator (DSA) large attenuation range distributed structure low insertion loss (IL) phase compensation phase imbalance reduced-size Gallium Arsenide (GaAs) Monolithic microwave integrated circuit (MMIC)

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Adaptive Hopping Transmission Strategy for Opportunistic Spectrum Access

Adaptive Hopping Transmission Strategy for Opportunistic Spe...

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54th Annual IEEE Global Telecommunications Conference (GLOBECOM)

作者： Derakhshani, Mahsa Le-Ngoc, Tho McGill Univ Dept Elect & Comp Engn Montreal PQ H3A 2K6 Canada

ISBN: (纸本)9781424492688

This paper presents an adaptive hopping transmission strategy for secondary users (SUs) to access temporarily idle frequency-slots of a licensed frequency band in consideration of the random return of primary users (PUs), aiming to maximize the overall SU throughput. A SU dynamically hops over multiple idle frequency-slots, each with an adaptive activity factor so that possible PU return in a frequency-slot may destroy only a small fraction of the SU transmission that can be recovered by erasure-correction coding. SU activity factor optimization problems are formulated to develop adaptive SU access algorithms for both centralized and distributed structures. Numerical results confirm the effectiveness and demonstrate performance gains of the proposed approach as compared to existing schemes.

关键词： Convex functions IEEE Communications Society Multiaccess communication Optimization PU Propagation losses SU activity factor optimization problem SU throughput SU transmission Sensors Throughput adaptive SU access algorithm adaptive activity factor adaptive hopping transmission strategy centralized structure distributed structure encoding erasure-correction coding idle frequency-slots licensed frequency band opportunistic spectrum access primary users radio networks secondary users

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An Algorithm of Data Fusion Using Artificial Neural Network and Dempster-Shafer Evidence Theory

An Algorithm of Data Fusion Using Artificial Neural Network ...

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IITA Internatonal Conference on Control, Automation and Systems Engineering

作者： Gong, Bing Heilongjiang Univ Sch Comp Sci & Technol Harbin Peoples R China

ISBN: (纸本)9780769537283

A new algorithm of data fusion using neural networks and Dempster-Shafer (D-S) evidence theory is presented in this paper to overcome these faults of data fusion, i.e., low accurate identification, bad stabilization and solution of uncertainty in some ways under multi-sensor environment. In this paper, according to the characteristic of the information obtained from multi-sensor obtained, firstly we divide obtained features into some groups and set up corresponding neural network to every group, meanwhile we introduce a concept of unknown probability to the goals based on the result of credible probability of these goals, secondly we have a fusion of time and space depending on the transpositional result of the neural networks' output by D-S evidence theory. This method has the advantage of both neural and D-S evidence theory, and solves the problem that the general ways of data fusion can not identify the multisensor's uncertainty information of great noise at present. At last simulation shows that the method can effectively improve the rate of the targets' identification and keep great antinoise capacity.

关键词： neural networks Dempster-Shafer evidence theory data fusion multi-sensor system distributed structure

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Flexible Discrete Passive Filter with Minor Strain Suffering 21

Flexible Discrete Passive Filter with Minor Strain Suffering

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21st International Conference on Electronic Packaging Technology (ICEPT)

作者： Yang, Xiaodong Zhao, Liwei You, Zixuan Qin, Guoxuan Tianjin Univ Sch Microelect Tianjin Peoples R China

ISBN: (纸本)9781728168265

This paper proposes a flexible passive filter and summarizes the design rules of a flexible filter from the perspective of physical design methods. Compared with the filter design method of lumped structure, the distributed structure can reduce the effect of stress and transfer the stress of flexible deformation from the device itself to the substrate, and under a certain range of stress, the device can maintain good performance. In this paper, the above viewpoints are well verified by simulation experiments. A distributed structure is used to design the passive filter, which reduces the stress damage and stress induced performance impact of the device, and provides theoretical guidance for enhancing the reliability design of the flexible filter.

关键词： flexible filter reliability physical design distributed structure

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