Modal Analysis Using Digital Image Correlation Technique: An Application to Artificial Wing Mimicking Beetle’s Hind Wing

被引:0
作者
N. S. Ha
H. M. Vang
N. S. Goo
机构
[1] Konkuk University,Smart Microsystem Research Laboratory, Department of Advanced Technology Fusion, Division of Interdisciplinary Studies
来源
Experimental Mechanics | 2015年 / 55卷
关键词
Digital image correlation; Modal analysis; Artificial wing; Beetle hind wing; Natural frequency; Mode shape;
D O I
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中图分类号
学科分类号
摘要
Understanding the dynamic behavior of structures has become increasingly important in the design process of any mechanical system. Therefore, the demands for improved structural performance have motivated the search for an effective method of structural dynamics testing, since the conventional methods are limited to the location of relatively few applied sensors. Due to the state-of-the-art optical technologies, the shape and deformation of a vibrating structure have been measured using 3-dimensional digital image correlation (DIC) technique. Although DIC has been used widely to construct the mode shape of the structure in modal measurement, it has rarely been applied to determine the full modal parameters (natural frequencies, mode shapes, damping factors). Therefore, this study presents an effective method to measure the full modal parameters of an artificial wing that mimics a beetle’s hind wing using the DIC technique. In our measurement, the artificial wing was mounted on a shaker, which was vibrated with a white noise signal. The full-field result as well as the displacement of a single point on the wing over time was then obtained using ARAMIS® software, a DIC technique-based software. From the temporal displacement of a single point signal in the time domain, we performed fast Fourier transform to obtain the frequency response function (FRF). The spectrum averaging technique and Savitzky-Golay filter were used to reduce the noise. Also, the natural frequencies and damping factors were determined from smoothed FRF. Finally, the mode shapes were measured using DIC at the pre-measured natural frequency.
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页码:989 / 998
页数:9
相关论文
共 139 条
[1]  
Helfrick MN(2011)3D digital image correlation methods for full-field vibration measurement Mech Syst Signal Process 25 917-927
[2]  
Niezrecki C(2000)Use of holographic interferometry and electronic speckle pattern interferometry for measurements of dynamic displacements Mech Syst Signal Process 14 49-62
[3]  
Avitabile P(1994)Double-pulse electronic speckle interferometry for vibration analysis Appl Opt 33 7857-7863
[4]  
Schmidt T(1998)Vibration analysis by means of digital shearography Opt Lasers Eng 30 199-212
[5]  
Caponero M(1999)Modal testing using a scanning laser Doppler vibrometer Mech Syst Signal Process 13 255-270
[6]  
Pasqua P(2011)Continuous Scan, a method for performing modal testing using meaningful measurement parameters; Part I Mech Syst Signal Process 25 3027-3042
[7]  
Paolozzi A(1983)Digital imaging techniques in experimental stress analysis Opt Eng 21 213427-139
[8]  
Peroni I(1983)Determination of displacements using an improved digital correlation method Image Vis Comput 1 133-C631
[9]  
Pedrini G(1985)A study of dynamic near-crack-tip fracture parameters by digital image analysis J Phys Colloques 46 C5-221
[10]  
Tiziani HJ(2003)In-plane strain measurement by digital image correlation J Braz Soc Mech Sci Eng 25 215-129