褚金奎

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:男

毕业院校:北京航空航天大学

学位:博士

所在单位:机械工程学院

学科:机械电子工程. 微机电工程. 测试计量技术及仪器

办公地点:机械大方楼6019

联系方式:0411-84706108

电子邮箱:chujk@dlut.edu.cn

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Viscoelastic Characterization of Long-Eared Owl Flight Feather Shaft and the Damping Ability Analysis

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论文类型:期刊论文

发表时间:2014-01-01

发表刊物:SHOCK AND VIBRATION

收录刊物:SCIE、EI、Scopus

卷号:2014

ISSN号:1070-9622

摘要:Flight feather shaft of long-eared owl is characterized by a three-parameter model for linear viscoelastic solids to reveal its damping ability. Uniaxial tensile tests of the long-eared owl, pigeon, and golden eagle flight feather shaft specimens were carried out based on Instron 3345 single column material testing system, respectively, and viscoelastic response of their stress and strain was described by the standard linear solid model. Parameter fitting result obtained from the tensile tests shows that there is no significant difference in instantaneous elastic modulus for the three birds' feather shafts, but the owl shaft has the highest viscosity, implying more obvious viscoelastic performance. Dynamic mechanical property was characterized based on the tensile testing results. Loss factor (tan delta) of the owl flight feather shaft was calculated to be 1.609 +/- 0.238, far greater than those of the pigeon (0.896 +/- 0.082) and golden eagle (1.087 +/- 0.074). It is concluded that the long-eared owl flight feather has more outstanding damping ability compared to the pigeon and golden eagle flight feather shaft. Consequently, the long-eared owl flight feathers can dissipate the vibration energy more effectively during the flying process based on the principle of damping mechanism, for the purpose of vibration attenuation and structure radiated noise reduction.