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- 저자 : Baicheng Li (검색결과 2 건)
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Incipient Fault Detection of Full Ceramic Ball Bearing Based on Modified Observer
Huaitao Shi,Maxiao Hou,Yuhou Wu,Baicheng Li 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.3
As a key part of the energy transmission chain, full ceramic ball bearing elements are considered as important components in ultraprecise rotating machines, which is required as a special attention in order to avoid expensive production shutdown due to the appearance of massive failures. Therefore, it is necessary to detect the appearance of incipient faults for full ceramic ball bearing elements by implementing an appropriate model. In this paper, an observer-based incipient fault detection method for full ceramic ball bearings is proposed. Firstly, the mechanism model of full ceramic ball bearing with incipient faults is established, and it is converted into a discrete-time model based on the zero-order hold equivalent method. Secondly, a modified observer is proposed as a residual generator, which has more design degrees of the freedom than the Luenberger observer. Thirdly, the l1/H∞ performance is introduced to enhance the disturbance robustness and incipient fault sensitivity. In addition, the design of an adaptive threshold can effectively avoid fault false alarms. Finally, the effectiveness of the proposed method is verified by numerical simulation.
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Genetic diversity and selection of Tibetan sheep breeds revealed by whole-genome resequencing
Dehong Tian,Buying Han,Xue Li,Dehui Liu,Baicheng Zhou,Chunchuan Zhao,Nan Zhang,Lei Wang,Quanbang Pei,Kai Zhao Asian Australasian Association of Animal Productio 2023 Animal Bioscience Vol.36 No.7
Objective: This study aimed to elucidate the underlying gene regions responsible for productive, phenotypic or adaptive traits in different ecological types of Tibetan sheep and the discovery of important genes encoding valuable traits. Methods: We used whole-genome resequencing to explore the genetic relationships, phylogenetic tree, and population genetic structure analysis. In addition, we identified 28 representative Tibetan sheep single-nucleotide polymorphisms (SNPs) and genomic selective sweep regions with different traits in Tibetan sheep by fixation index (Fst) and the nucleotide diversity (θπ) ratio. Results: The genetic relationships analysis showed that each breed partitioned into its own clades and had close genetic relationships. We also identified many potential breed-specific selective sweep regions, including genes associated with hypoxic adaptability (MTOR, TRHDE, PDK1, PTPN9, TMTC2, SOX9, EPAS1, PDGFD, SOCS3, TGFBR3), coat color (MITF, MC1R, ERCC2, TCF25, ITCH, TYR, RALY, KIT), wool traits (COL4A2, ERC2, NOTCH2, ROCK1, FGF5, SOX9), and horn phenotypes (RXFP2). In particular, a horn-related gene, RXFP2, showed the four most significantly associated SNP loci (g. 29481646 A>G, g. 29469024 T>C, g. 29462010 C>T, g. 29461968 C>T) and haplotypes. Conclusion: This finding demonstrates the potential for genetic markers in future molecular breeding programs to improve selection for horn phenotypes. The results will facilitate the understanding of the genetic basis of production and adaptive unique traits in Chinese indigenous Tibetan sheep taxa and offer a reference for the molecular breeding of Tibetan sheep.
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