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1,928 results on '"Liu, Limin"'

9. An active jamming recognition algorithm based on ER-C-L network model

Author

ZHAO Zhongchen, LIU Limin, XIE Hui, HAN Zhuangzhi, JING He

Subjects
active jamming recognition, convolutional neural networks, compound feature, Military Science
Abstract

To solve the problem of low recognition accuracy of radar active jamming in strong noise environment,an algorithm for ER-C-L(Extended ResNet-CNN-LSTM) network model based on one-dimensional composite features is proposed. Firstly, the amplitude, instantaneous frequency, instantaneous envelope of power spectrum and their composite features are taken as network input to compare their recognition accuracy in ResNet-CNN model. The composite features of amplitude and instantaneous envelope of power spectrum with high detection probability and small data volume are selected as the optimal features. Then, the complex features are injammed into the ER-C-L network to identify six new active jamming models. Simulation experiments show that the recognition accuracy of jamming is 98.5% in strong noise environment within the JNR of -10 dB. Compared with other deep learning algorithms such as CNN, ResNet-CNN, extended ResNet-CNN and LSTM, it has higher interference recognition accuracy.

Published
2024
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11. Review of Research on Rolling Bearing Health Intelligent Monitoring and Fault Diagnosis Mechanism

Author

WANG Jing, XU Zhiwei, LIU Wenjing, WANG Yongsheng, LIU Limin

Subjects
health monitoring, fault diagnosis, data distribution, signal analysis, data-driven, Electronic computers. Computer science, QA75.5-76.95
Abstract

As one of the most critical and failure-prone parts of the mechanical systems of industrial equipment, bearings are subjected to high loads for long periods of time. When they fail or wear irreversibly, they may cause accidents or even huge economic losses. Therefore, effective health monitoring and fault diagnosis are of great significance to ensure safe and stable operation of industrial equipment. In order to further promote the development of bearing health monitoring and fault diagnosis technology, the current existing models and methods are analyzed and summarized, and the existing technologies are divided and compared. Starting from the distribution of vibration signal data used, firstly, the relevant methods under uniform data distribution are sorted out, the classification, analysis and summary of the current research status are carried out mainly according to signal-based analysis and data-driven-based, and the shortcomings and defects of the fault detection methods in this case are outlined. Secondly, considering the problem of uneven data acquisition under actual working conditions, the detection methods for dealing with such cases are summarized, and different processing techniques for this problem in existing research are classified into data processing methods, feature extraction methods, and model improvement methods according to their different focuses, and the existing problems are analyzed and summarized. Finally, the challenges and future development directions of bearing fault detection in existing industrial equipment are summarized and prospected.

Published
2024
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12. Self-healing of fractured diamond

Author

Qiu, Keliang, Hou, Jingpeng, Chen, Shuai, Li, Xiang, Yue, Yonghai, Xu, Bo, Hu, Qi, Liu, Limin, Yang, Zhenyu, Nie, Anmin, Gao, Yufei, Jin, Tianye, Wang, Jing, Li, Yanhong, Wang, Yanbin, Tian, Yongjun, and Guo, Lin

Published
2023
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40. Experimental and theoretical study on the natural circulation characteristics of humid air in the fuel assembly of a full-scale pressurized water reactor

Author

LI Leilei, LIU Maolong, NI Song, WANG Xiaowen, LIU Limin, and GU Hanyang

Subjects
spent fuel pool, fuel assembly, humid air, natural circulation flow rate model, peak cladding temperature model, Nuclear engineering. Atomic power, TK9001-9401
Abstract

BackgroundNatural circulation systems are widely used in the nuclear industry for decay heat removal, post-accident containment cooling, and the cooling of radioactive waste storage facilities. Because a large number of spent fuel assemblies are densely arranged in the spent fuel pool, the spent fuel assemblies in the central area of the spent fuel pool can be approximated as having adiabatic boundary conditions. In the event of a coolant loss accident, the heat generated by the spent fuel assemblies can be exported only by the natural circulation of air.PurposeThis study aims to develop analytical models for fuel assembly natural circulation characteristics independent of the results of computational fluid dynamics (CFD) to investigate the natural circulation characteristics of spent fuel pools following a coolant loss accident.MethodsBased on the experimental results of a fuel assembly pressure drop of a full-scale pressurized water reactor (PWR), the Darcy–Forchheimer model was firstly revised to predict the pressure drop of humid air flowing through the fuel assembly. Models for the fuel assembly natural circulation flow rate and peak cladding temperature were then established, and the effects of the relative humidity of air on the models were considered. Finally, these models were applied to investigating effects of total heating power, ambient temperature, and relative humidity on the natural circulation flow rate and peak cladding temperature of the fuel assembly.ResultsThe results show that the models accurately predict the natural circulation flow rate and peak cladding temperature of the fuel assembly under different heating powers, and the errors are less than 25% and 20%, respectively, as compared with the experimental measurement values.ConclusionsThe developed models in this study can be used to study the natural circulation characteristics of full-scale PWR fuel assemblies.

Published
2024
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