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A component mode synthesis method for 3-D finite element models of aero-engines
Yanfei Zuo,Jian-jun Wang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.12
Because of the complicated configuration of aero-engines, 3-D finite element models are convenient and accurate to to simulate the vibrationperformance of the aero-engines, and are now widely used with a high order of Degrees of freedom (DOFs). A Component modesynthesis (CMS) method is introduced to reduce the computational effort of rotors and stator modeled by 3-D finite element. By additionalmaster DOFs in substructures it’s more convenient than traditional CMS to get the inner response of substructures without modeexpansion and is validated as being as accurate as traditional CMS. Rotating substructure of rotors with variable spinning speed can alsobe reduced by the method. Reduced gyroscopic matrix depended by variable spinning speed can be easily obtained by multiplying aspeed coefficient to unit condensed gyroscopic matrix. A reduction example of an aero-engine model including casing model, bearingsand counter-rotating rotors shows the accuracy and efficiency of the method. The method greatly decreases RAM and solution time usedfor dynamic analysis, which brings possibilities of a great number of repeatability analyses.
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Chen, Yong,Luo, Hailing,Liu, Xueliang,Wang, Zhenzhen,Zhang, Yuwei,Liu, Kun,Jiao, Lijuan,Chang, Yanfei,Zuo, Zhaoyun Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.5
To investigate the effect of restricted grazing time on behavior of Tan sheep on desert steppe, forty 4-months old male Tan sheep with an original body weight (BW) of $15.62{\pm}0.33$ kg were randomly allocated to 4 grazing groups which corresponded to 4 different restricted grazing time treatments of 2 h/d (G2), 4 h/d (G4), 8 h/d (G8) and 12 h/d (G12) access to pasture. The restricted grazing times had a significant impact on intake time, resting time, ruminating time, bite rate and movement. As the grazing time decreased, the proportion of time spent on intake, bite rate and grazing velocity significantly (p<0.05) increased, but resting and ruminating time clearly (p<0.05) decreased. The grazing months mainly depicted effect on intake time and grazing velocity. In conclusion, by varying their foraging behavior, Tan sheep could improve grazing efficiency to adapt well to the time-limited grazing circumstance.
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