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A Fault Diagnosis Method for Electric Vehicle Lithium Power Batteries Based on Dual-Feature Extraction from the Time and Frequency Domains

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Journal of Electrochemical Energy Conversion and storage 2025年第3期22卷 031008页

作者： Chang, Chun Dai, Jiuhe Pan, Yaliang Lv, Lu Gao, Yang Jiang, Jiuchun Hubei Key Lab. for High Efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China Sunwoda Electronic Co. Ltd Shenzhen518108 China School of Electric Power South China University of Technology Guangzhou510640 China

This study focuses on the safety and reliability issues of lithium-ion batteries, proposing a fault diagnosis strategy that leverages dual-feature extraction from both the time and frequency domains. Additionally, by modifying the traditional autoencoder, the study proposes a feature-guided autoencoder as an unsupervised model for extracting features in the time domain. Initially, wavelet packet decomposition and its energy-denoising treatment are employed to refine fault information within battery voltage signals. Subsequently, the reconstruction error outputted by the Feature-Guided Autoencoder is utilized as the time-domain fault feature, while the cosine similarity of the energy of signals in various frequency bands obtained after wavelet packet decomposition serves as the frequency-domain fault feature. Ultimately, this article selects the Isolation Forest algorithm for two-dimensional outlier detection of time and frequency features. Experimental results demonstrate that the feature-guided autoencoder proposed in this study not only enhances the sensitivity of time-domain fault features compared to traditional autoencoders and their variants but also optimizes issues related to training time and computational load. The effectiveness of the proposed dual-feature fault diagnosis method in both the time and frequency domains is validated through data from two actual vehicles, showing superior early fault detection capability relative to single-feature fault diagnosis methods. Copyright © 2024 by ASME.

关键词： Wavelet decomposition

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Extending attributes page:a scheme for enhancing the reliability of storage system metadata

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1106-1113页

作者： Juan WANG Dan FENG Fang WANG Cheng-tao LU MOE Key Lab of Data Storage System Huazhong University of Science and Technology Wuhan 430074 China

In an object-based storage system,a novel scheme named EAP(extending attributes page) is presented to enhance the metadata reliability of the system by adding the user object file information attributes page for each user object and storing the file-related attributes of each user object in object-based storage *** EAP scheme requires no additional hardware equipments compared to a general method which uses backup metadata servers to improve the metadata *** a Markov chain,this paper compares the metadata reliability of the system using the EAP scheme with that using only metadata servers to offer the file metadata *** results demonstrate that the EAP scheme can dramatically enhance the reliability of storage system metadata.

关键词： Metadata server Metadata reliability Markov model Extending attributes page （EAP）

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Research and implementation of remote desktop protocol service over SSL VPN

Research and implementation of remote desktop protocol servi...

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Proceedings - 2004 IEEE International Conference on Services Computing, SCC 2004

作者： Cai, Longzheng Yu, Shengsheng Zhou, Jing-Li Key Lab. of Data Storage System Ministry of Education Wuhan 430074 China

ISBN: (纸本)0769522254

Remote Desktop Protocol (RDP) allows a client to communicate with a Windows server. With RDP, you can run applications on a server from a remote client. RDP uses authentication and encryption to prevent traffic from leak. But the methods used have vulnerabilities and may encounter attacks. In this paper, a security-enhanced approach is proposed and implemented.

关键词： Network protocols

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Enhanced Generalized Spatial Modulation for STAR-RIS-Aided Vehicular Communication system

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IEEE Transactions on Consumer Electronics 2025年

作者： Shang, Pingping Han, Xue Hou, Jia Li, Jun Wang, Shucheng Hubei University of Technology School of Electrical and Electronic Engineering Wuhan430068 China Hubei University of Technology Hubei Key Lab. for High-Efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Wuhan430068 China Soochow University School of Electronic and Information Engineering Suzhou215000 China Guangzhou University School of Electronics and Communication Engineering Guangzhou510006 China Wuhan Maritime Communication Research Institute Wuhan430205 China

In this paper, a novel scheme is proposed by introducing the concept of generalized spatial modulation (GSM) and space-time block code (STBC) into simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) for vehicular communication system. To improve spectral efficiency and diversity gain of vehicular system, STAR-RIS array elements are categorized into reflective and transmissive blocks, establishing a mapping relationship with the index bits by using GSM. Subsequently, the modulated symbols are reflected or transmitted based on the predetermined allocation patterns of the blocks. Specifically, to enhance the reliability of signal reception, one of the most renowned STBC schemes, the Alamouti code, is employed at the STAR-RIS surface by receiving and detecting signals across two consecutive time slots. Furthermore, the new design of leveraging STAR-RIS as an access point (AP) is proposed, which plays the role of source in the communication scenario. The mathematical formulas and theoretical average bit error rate (BER) of the scheme are derived based on preceding analysis. According to simulation results, the suggested scheme can outperform conventional schemes in terms of BER performance. In addition, the proposed redesigned scheme further improves the BER performance with better channel conditions, exhibiting excellent performance advantages. © 1975-2011 IEEE.

关键词： Space-time block coding (STBC)

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Dynamics process of long-running allocation/collection in linear storage space

Dynamics process of long-running allocation/collection in li...

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2nd International Conference on Networking, Architecture, and storage, NAS 2007

作者： Qiang, Cao Guo, Tian-Jie Xie, Chang-Sheng Key Lab. of Data Storage System Computer School of Sci. and Tech. Huazhong University of Science and Technology

ISBN: (纸本)0769529275

storage system could provide storage space and relevant access operations including allocating storage resources to new object and reclaiming storage space occupied by released objects. Allocation and collection operations are frequent, basic and specially impact on data distribution in storage space. Contrarily, data distribution also heavily effect on performance of access operations including of allocation and collection. However, it is absent to study how above two basic operates effect on data distribution in long time running. In this paper, dynamics process of continuously allocating and collecting in linear storage space are analyzed and described. We firstly build an abstract theory model of storage system. Furthermore, the dynamics of allocating/collecting is discussed. We obtain relevant descriptive equation and prove the discrete degree of system to converge around a fixed value in both continuous and inconsecutive allocation cases. In the end, our simulation experiment also could validate academic analysis. © 2007 IEEE.

关键词： Dynamics

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SOSS: Smart object-based storage system

SOSS: Smart object-based storage system

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Proceedings of 2004 International Conference on Machine Learning and Cybernetics

作者： Zeng, Ling-Fang Feng, Dan Qin, Ling-Jun Key Lab. of Data Storage System Huazhong Univ. of Sci. and Technol. Ministry of Education Wuhan China

ISBN: (纸本)0780384032

Hints for storage system come from three aspects: The first is in combination with accurate file or directory attribute layout. The second is from existing file system and depends on user input. The third is from file content analysis. But in the SOSS (smart object-based storage system), object, a new fundamental storage component different from traditional storage unit (file or block), is introduced. And object provides ample hints for storage system, which can help with designing more intelligent (or smarter) storage system. This paper gives a brief introduction about SOSS, and some method adopted in SOSS to achieve intelligence, such as pattern recognition method, predicting object properties method and an adaptive cache replacement policy (all are based on object attribute), are studied.

关键词： storage allocation (computer)

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A scalab.e object-based intelligent storage device

A scalable object-based intelligent storage device

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Proceedings of 2004 International Conference on Machine Learning and Cybernetics

作者： Feng, Dan Qin, Ling-Jun Zeng, Ling-Fang Liu, Qun Key Lab. of Data Storage System Ministry of Education Huazhong Univ. of Sci. and Technol. Wuhan China

ISBN: (纸本)0780384032

A Scalab.e Object-based Intelligent storage Device (SOID) is presented in the paper. A scalab.e way in SOID to describe object attributes is discussed and it makes the system adaptive to more application fields. In SOID system, users can register and upload methods at device and associate an object with a chain of methods. Any kind of operations on objects can be performed by the method chains which are executed by taking the object as input stream in a SOID, SOID has explored two promising enhancements: object-based interface and embedded computational capabilities, and it improves the scalab.lity of storage system.

关键词： data storage equipment

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Cache prefetching adaptive policy based on access pattern

Cache prefetching adaptive policy based on access pattern

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Proceedings of 2002 International Conference on Machine Learning and Cybernetics

作者： Zhou, Ke Zhang, Jiang-Ling Feng, Dan Wan, Zhi-Kun Huazhong Univ. of Sci. and Technol. Data Storage State Key Lab. Ministry of Education Wuhan China

ISBN: (纸本)0780375084

Different policy of cache and prefetching fits different access pattern. This paper introduces research status of cache and prefetching technologies of storage system. By analyzing access pattern, this paper provides a module of access pattern and tests cache and prefetching adaptive policy on RAID (redundant array of independent disk). Test proves that adaptive policy can get optimal performance of RAID under different conditions.

关键词： Pattern recognition

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PDRS: A new Recovery Scheme application for vertical RAID-6 code

PDRS: A new Recovery Scheme application for vertical RAID-6 ...

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IEEE International Conference on Networking, Architecture and storage

作者： Li, Siyi Cao, Qiang Huang, Jianzhong Wan, Shenggang Xie, Changsheng School of Computer Sci. and Tech. Huazhong University of Sci. and Tech. Data Storage System Lab. Wuhan 430074 China

ISBN: (纸本)9780769545097

As the technique developing, some important problems in storage systems have been solved appropriately. A good example is the development of RAID-6 code techinque, the appear of it has greatly improved the reliability, availab.lity of modern storage systems. Some best known vertical RAID-6 code like P-code and X-code has acquire optimal or near optimal performance in encoding, decoding and update. But they do not detailedly analysis the status of reconstruction with single-disk failure. In the status, there are many paths to perform reconstructing. But the path you choice will greatly affect the performance of whole storage system. Based the phenomenon found above, we present a fast and effcient scheme, Path Directed Recovery Scheme (PDRS for short), to find a optimal path to reconstruct single-disk failure in P-code and X-code. Using PDRS, we will acquire some benefits: (1) it can decrease the disk I/O complexity caused by reconstruction and therefore accelerating the speed of reconstruction;(2) it can balance the load on each disk, consequently can avoid the hot problem in a degree. We perform theoretical analysis and evaluation of the PDRS when applied in P-code with p - 1-disk and X-code with p-disk. Our theoretical analysis shows that PDRS applied in P-code with (p-1)-disk can acquire up to 25% performance improvement. To verify the effectiveness of PDRS, we have conducted intenvice simulation. The simulation results shows that PDRS applied in P-code with (p - 1)-disk can speedup the recovery duration by up to 23.6% under spare-rebuilding mode. Overall, PDRS is a efficient and useful recovery scheme that can applied to all of the vertical RAID-6 code. © 2011 IEEE.

关键词： Recovery

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Studying of multi-dimensional based replica management in object storage system

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IFIP International Conference Embedded and Ubiquitous Computing

作者： Tan, Zhipeng Feng, Dan He, Fei Zhou, Ke Huazhong Univ Sci & Technol Minist Educ Sch Comp Dept Comp SciKey Lab Data Storage System Wuhan 430074 Peoples R China

ISBN: (纸本)9783540770893

The Object-based storage system (OBS) has been proposed as a novel information storage technology in adaptation to the explosive growth in information quantity under the next-generation internet. The OBS treats all storage devices (OSD) and data information as objects, hence, the issues like reducing access delay over WAN, saving limited bandwidth and enhancement of data validity become problems related to the overall performance of OBS. To address these problems, we have the replica-based OBS, which brings forward a new issue on how to manage these replicas. In this paper, we present a multi-dimensional replica management scheme, and study the object searching performance within this mode. We deliver the optimal tree & improved one-path tree on the basis of similarity searching, with detailed replica indexing algorithm and emulation tests. The result of these experiments justifies their better performance in contrast to normal similarity-based indexing algorithm, with lower system cost.

关键词： multi-dimensional architecture optimal tree one-path tree replica management searching

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