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RISS 인기검색어
- 검색키워드
- 저자 : Xinfeng Ge (검색결과 2 건)
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Wenfeng Li,Xinfeng Ge,Manying Liang,Xiong Deng 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8
Torsional vibration is prevalent in rotating mechanical systems such as powertrain transmission. It is a hot spot in current torsional vibration control research to effectively suppress torsional vibration of the system by implementing adaptive torsional dampers with adjustable parameters. The current research focuses on the variable damping torsional vibration absorber, while the investigation on variable stiffness torsional vibration absorber remains at the theoretical stage. With this premise, a transmission system with a novel magnetorheological variable stiffness and damping torsional vibration absorber (MR-VSDTVB) is proposed. MR-VSDTVB with sequential adjustment of torsional damping and stiffness parameters is developed. Its aggregate dynamic output characteristics of stiffness and damping are tested. To describe the nonlinear output characteristics with coupled multiple control parameters of MR-VSDTVB and the subsequent control, a GA-BP neural network model and a hierarchical inverse model are adopted. To validate the feasibility of the transmission system with MRVSDTVB, a dynamic model of the transmission system with MR-VSDTVB is constructed and simplified, and then the numerical simulation analysis and experimental tests are carried out. The output performances of the MR semi-active system with various traditional semi-active control strategies show that the transmission system with the proposed MR-VSDTVB can suppress torsional vibration effectively.
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Jin, Sihua,Yang, Lei,He, Tingting,Fan, Xinfeng,Wang, Yiqiu,Ge, Kai,Geng, Zhaoyu Asian Australasian Association of Animal Productio 2018 Animal Bioscience Vol.31 No.9
Objective: The uncoupling protein 3 (UCP3) is a member of the mitochondrial anion carrier superfamily and has crucial effects on growth and feed efficiency in many species. Therefore, the objective of the present study was to examine the association of polymorphisms in the UCP3 gene with feed efficiency in meat-type chickens. Methods: Six single nucleotide polymorphisms (SNPs) of the UCP3 gene were chosen to be genotyped using matrix-assisted laser desorption-ionization time-of-flight mass spectrometry in meat-type chicken populations with 724 birds in total. Body weight at 49 (BW49) and 70 days of age (BW70) and feed intake (FI) in the interval were collected, then body weight gain (BWG) and feed conversion ratio (FCR) were calculated individually. Results: One SNP with a low minor allele frequency (<1%) was removed by quality control and data filtering. The results showed that rs13997809 of UCP3 was significantly associated with BWG and FCR (p<0.05), and that rs13997811 had significant effects on BW70 and BWG (p<0.05). Rs13997812 of UCP3 was strongly associated with BW70, FI, and FCR (p<0.05). Furthermore, individuals with AA genotype of rs13997809 had significantly higher BWG and lower FCR (p<0.05) than those with AT genotype. The GG individuals showed strongly higher BW70 and BWG than AA birds in rs13997811 (p<0.05). Birds with the TT genotype of rs13997812 had significantly greater BW70 and lower FCR compared with the CT birds (p<0.05). In addition, the TAC haplotype based on rs13997809, rs13997811, and rs13997812 showed significant effects on BW70, FI, and FCR (p<0.05). Conclusion: Our results therefore demonstrate important roles for UCP3 polymorphisms in growth and feed efficiency that might be used in meat-type chicken breeding programs.
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