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RISS 인기검색어
- 검색키워드
- 저자 : Wentao Shan (검색결과 5 건)
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Wentao Shan,Xiaoan Chen,Ye He,Jinming Zhou 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.8
Because of the complicated running condition and many unpredicted factors such as unmodelled dynamics and external disturbances,the fault analysis of the high-speed motorized spindle is proved difficult. In this paper, a novel experimental method is proposed to research the vibration characteristics of the running high-speed motorized spindle. The method consists of four steps. Firstly, the vibration signal measurement and processing system are built according to data collector and signal analysis software, and then, the vibration signal of the spindle extracted from sophisticated experimental environment is studied by using harmonic wavelet transform for its advantages,such as ultra-narrow band, high resolution detection and ability of extracting weak signal. After that, local frequency domain zooming technique of harmonic wavelet packet is employed to study the vibration spectrum of the spindle at eight different rotating speeds. Furthermore, the axis orbit of the rotor is purified successfully, which can serve as verification basis for subsequent on-site fault diagnosis. Finally, a comparative analysis of eight different vibration signals under the same load but different speeds condition is carried out, the spectral components are classified into two types: the repeated ones and the regular ones. The accordance between experimental results and theoretical analysis suggests that the proposed method in this paper is effective.
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Zhu Wentao,Zhou Juan,Lu Shan,Yang Jing,Lai Xin-He,Jin Dong,Pu Ji,Huang Yuyuan,Liu Liyun,Li Zhenjun,Xu Jianguo 한국미생물학회 2022 The journal of microbiology Vol.60 No.2
Four novel Gram-negative, mesophilic, aerobic, motile, and cocci-shaped strains were isolated from tick samples (strains 546T and 573) and respiratory tracts of marmots (strains 1318T and 1311). The 16S rRNA gene sequencing revealed that strains 546T and 573 were 97.8% identical to Roseomonas wenyumeiae Z23T, whereas strains 1311 and 1318T were 98.3% identical to Roseomonas ludipueritiae DSM 14915T. In addition, a 98.0% identity was observed between strains 546T and 1318T. Phylogenetic and phylogenomic analyses revealed that strains 546T and 573 clustered with R. wenyumeiae Z23T, whereas strains 1311 and 1318T grouped with R. ludipueritiae DSM 14915T. The average nucleotide identity between our isolates and members of the genus Roseomonas was below 95%. The genomic G+C content of strains 546T and 1318T was 70.9% and 69.3%, respectively. Diphosphatidylglycerol (DPG) and phosphatidylethanolamine (PE) were the major polar lipids, with Q-10 as the predominant respiratory quinone. According to all genotypic, phenotypic, phylogenetic, and phylogenomic analyses, the four strains represent two novel species of the genus Roseomonas, for which the names Roseomonas haemaphysalidis sp. nov. and Roseomonas marmotae sp. nov. are proposed, with 546T (= GDMCC 1.1780T = JCM 34187T) and 1318T (= GDMCC 1.1781T = JCM 34188T) as type strains, respectively.
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Study on the added mass effect in squeeze-film dampers
Hongchang Wang,Wentao Shan,Chengtao Yu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
Squeeze-film dampers (SFD) are used as indispensable bearings in many rotating machines to suppress lateral vibration and enhance stability. The kinetic energy of the damping fluid is sometimes greater than that of SFD’s journal. Therefore, the influence of the damping fluid must be considered in establishing a dynamic model of a rotor–bearing system. A concept that involves the added mass of the damping fluid is proposed in this work, and the calculation formula is derived based on laminar flow theory and the mean-square speed of the fluid. The unbalance responses of a rotor–bearing system are solved by numerical iteration and with the transfer matrix method. The results calculated with and without added mass are compared. Experimental results indicate that introducing the added mass of the damping fluid into a dynamic model is effective.
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Chengtao Yu,Yuemei Sun,Hongchang Wang,Fan Shi,Yu Chen,Wentao Shan 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
In this paper, a radial and axial integrated auxiliary bearing (RAIAB) device which can eliminate all radial and axial protective clearances after the rotor dropping is proposed to improve the reliability of the active magnetic bearing systems. In the proposed RAIAB, a strategy that the rotor end and the inner bushing are machined into conical surface is adopted so that the radial and axial clearances between the rotor and the inner bushing can be eliminated simultaneously when the inner bushing moves along the axial direction. In order to research the influence of the conical degree of the inner bushing on the performance of the RAIAB, the preliminary prototype experimental rig is developed and the cases of a 5 degree of freedom AMB rotor dropping on RAIABs at maximum speed of 30000 rpm are tested. The experimental results show that the RAIAB installed with a 30-conical degree inner bushing can successfully eliminate all protective clearances after the AMB rotor drops. However, the RAIAB installed with a 45-conical degree inner bushing is not able to eliminate clearance when the dropping speed of the rotor exceeds 18000 rpm.
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Jiao Yifan,Zhang Sihui,Yang Jing,Lai Xin-He,Dong Kui,Cheng Yanpeng,Xu Mingchao,Zhu Wentao,Lu Shan,Jin Dong,Pu Ji,Huang Ying,Liu Liyun,Wang Suping,Xu Jianguo 한국미생물학회 2022 The journal of microbiology Vol.60 No.2
Two facultatively anaerobic, short rod-shaped, non-motile, Gram-stain-positive, unknown bacterial strains (JY-X040T and JY-X174) were isolated from fluvial sediments of Tongtian River in Yushu Tibetan Autonomous Prefecture, Qinghai province, China. Cells formed translucent, gray, round and convex colonies, with a diameter of less than 0.5 mm after 5 days of incubation at 30°C on brain heart infusion-5% sheep blood agar. The 16S rRNA gene sequence similarity between strain JY-X040T and Fudania jinshanensis 313T is 93.87%. In the four phylogenetic trees constructed based on the 16S rRNA gene and 423 core genes, the two isolates form an independent branch, phylogenetically closest to F. jinshanensis 313T, but could not be classified as a member of the genus Fudania or any other genus of the family Arcanobacteriaceae. The DNA G + C content of strain JY-X040T was 57.8%. Calculation results of average nucleotide identity, digital DNADNA hybridization value and amino acid identity between strain JY-X040T and F. jinshanensis 313T are 69.9%, 22.9%, and 64.1%. The major cellular fatty acids were C16:0 (23%) and C18:1ω9c (22%). The cell-wall peptidoglycan type was A5α (L-Lys-L-Ala-L-Lys-D-Glu). The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannoside and four unidentified components. The whole-cell sugars contained rhamnose and ribose. MK-10(H4) was the sole respiratory quinone. The minimum inhibitory concentration of streptomycin was 32 μg/ml. All physiological, biochemical, chemotaxonomic and genomic characteristics support that strains JY-X040T and JY-X174 represent members of a novel species in a new genus, Changpingibacter yushuensis gen. nov., sp. nov. The type strain is JY-X040T (GDMCC 1.1996T = KCTC 49514T).
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