Vibration attenuation performance of long-eared owl plumage

JialiGao,; JinkuiChu,; HaixinShang,; LeGuan,

doi:10.1680/jbibn.15.00003

Cited by 7 publications

(11 citation statements)

References 20 publications

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“…We recorded feather vibrational motions using high-speed video filmed with a GoPro Hero 4 Black Edition camera (720 x 1280 pixels; 240 frames s -1 ; GoPro, San Mateo, CA, USA). Similar video and imaging-based methods have been used to measure resonance in whiskers [71–74], insect antennae [75], feathers [76] and human-made structures [77,78]. Image and data analysis were performed using custom programs based on the MATLAB 2015a Machine Vision, Signal Processing and Curve Fitting toolboxes (MathWorks, Natick, MA, USA); the MATLAB scripts to reproduce this analysis are available with the data repository for this study [70].…”

Section: Methodsmentioning

confidence: 99%

Biomechanics of the peafowl’s crest reveals frequencies tuned to social displays

2018

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Feathers act as vibrotactile sensors that can detect mechanical stimuli during avian flight and tactile navigation, suggesting that they may also detect stimuli during social displays. In this study, we present the first measurements of the biomechanical properties of the feather crests found on the heads of birds, with an emphasis on those from the Indian peafowl (Pavo cristatus). We show that in peafowl these crest feathers are coupled to filoplumes, small feathers known to function as mechanosensors. We also determined that airborne stimuli with the frequencies used during peafowl courtship and social displays couple efficiently via resonance to the vibrational response of their feather crests. Specifically, vibrational measurements showed that although different types of feathers have a wide range of fundamental resonant frequencies, peafowl crests are driven near-optimally by the shaking frequencies used by peacocks performing train-rattling displays. Peafowl crests were also driven to vibrate near resonance in a playback experiment that mimicked the effect of these mechanical sounds in the acoustic very near-field, reproducing the way peafowl displays are experienced at distances ≤ 1.5m in vivo. When peacock wing-shaking courtship behaviour was simulated in the laboratory, the resulting airflow excited measurable vibrations of crest feathers. These results demonstrate that peafowl crests have mechanical properties that allow them to respond to airborne stimuli at the frequencies typical of this species’ social displays. This suggests a new hypothesis that mechanosensory stimuli could complement acoustic and visual perception and/or proprioception of social displays in peafowl and other bird species. We suggest behavioral studies to explore these ideas and their functional implications.

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Section: Methodsmentioning

confidence: 99%

Biomechanics of the peafowl’s crest reveals frequencies tuned to social displays

2018

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“…2) Apply either a 344 step deflection or an impulsive force to provide a stimulus with a broad, uniform frequency spectrum, then measure the vibrational response of the sample as a function of time. If a single 346 resonant mode of vibration is excited, then the sample's response corresponds to a sinusoid at the natural frequency with exponentially decaying amplitude (Hartmann et al, 2003;Neimark et al, 348 2003;Wolfe et al, 2008;Dirks and Dürr, 2011;Gao et al, 2015). Below we describe how we performed each of these tests, as well as establishing the linearity of bending elasticity of the 350 peafowl crests.…”

Section: Vibrational Dynamics Measurementsmentioning

confidence: 99%

“…A second standard method for determining the vibrational response of a system involves 386 applying a transient impulsive force and then measuring the system's subsequent vibrational response to measure its natural frequency of vibration, fo, and the exponential decay in time of its 388 vibrational amplitude [71,82,72,75,76]; this is analogous to striking a bell and recording how it rings at a well-defined frequency as its sound intensity decays in time. This method is also 390 relevant for determining the response of the crest to impulsive airflows due to each flap of the wing during wing-shaking.…”

Section: Force Impulse Experimentsmentioning

confidence: 99%

“…and compared those values with in vivo train-and tail-rattling shaking frequencies (Dakin et al, 2016). Similar video and imaging-based methods have been used to measure resonance in 248 whiskers (Hartmann et al, 2003;Wolfe et al, 2008;Shatz and Groot, 2013;Hans et al, 2014), insect antennae (Dirks and Dürr, 2011), feathers (Gao et al, 2015) and human-made structures 250 (Ferrer et al, 2013;Paunescu et al, 2015). Because interactions between feathers can influence their resonant frequency and damping (Cummins and Gedeon, 2012), we compared the 252 biomechanics of whole crests to that of isolated crest feathers.…”

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confidence: 99%

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Biomechanics of the peafowl’s crest reveals frequencies tuned to social displays

Kane

Beveren

Dakin

2017

Preprint

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Summary statement: Avian crest feathers have mechanical properties that make them suitable 18 for sensing airflows generated during multimodal social displays. 20. CC-BY-NC-ND 4.0 International license peer-reviewed) is the author/funder. It is made available under a The copyright holder for this preprint (which was not . http://dx.doi.org/10.1101/197525 doi: bioRxiv preprint first posted online Oct. 2, 2017; 2 ABSTRACT 22Feathers act as vibrotactile sensors that can detect mechanical stimuli during avian flight and tactile navigation, suggesting that they may also function to detect signals during social 24 displays. We explored this novel sensory modality using the crest plumage of Indian peafowl (Pavo cristatus). We first determined whether the airborne stimuli generated by peafowl 26 courtship and social displays couple efficiently via resonance to the vibrational response of feather crests from the heads of peafowl. Peafowl crests were found to have fundamental 28 resonant modes with frequencies that could be driven near-optimally by the shaking frequencies used by peafowl performing train vibrating displays. Crests also were driven to vibrate near 30 resonance when audio recordings of sounds generated by these displays were played back in the acoustic near-field, where such displays are experienced in vivo. When peacock wing-shaking 32 courtship behaviour was simulated in the laboratory, the resulting directional airflow excited measurable vibrations of crest feathers. These results suggest that peafowl crests have properties 34 that make them suitable mechanosensors for airborne stimuli generated during social displays. Such stimuli could complement acoustic perception, thereby enhancing detection and 36 interpretation of social displays. Diverse feather crests are found in many bird species that perform similar displays, suggesting that this proposed sensory modality may be widespread, and 38 possibly derived from flow sensing in other contexts. We suggest behavioral studies to further explore these ideas and their functional implications. 40

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“…to improve existing products, for example, noise reduction and vibration of aviation wings inspired by owls [34,35]…”

Section: Biologically Inspired Design In Innovationmentioning

confidence: 99%

What Do We Learn from Good Practices of Biologically Inspired Design in Innovation?

Chirazi¹,

Wanieck

Fayemi³

et al. 2019

Applied Sciences

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Biologically inspired design (BID) is an emerging field of research with increasing achievements in engineering for design and problem solving. Its economic, societal, and ecological impact is considered to be significant. However, the number of existing products and success stories is still limited when compared to the knowledge that is available from biology and BID research. This article describes success factors for BID solutions, from the design process to the commercialization process, based on case studies and market analyses of biologically inspired products. Furthermore, the paper presents aspects of an effective knowledge transfer from science to industrial application, based on interviews with industrial partners. The accessibility of the methodological approach has led to promising advances in BID in practice. The findings can be used to increase the number of success stories by providing key steps toward the implementation and commercialization of BID products, and to point out necessary fields of cooperative research.

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Vibration attenuation performance of long-eared owl plumage

Cited by 7 publications

References 20 publications

Biomechanics of the peafowl’s crest reveals frequencies tuned to social displays

Biomechanics of the peafowl’s crest reveals frequencies tuned to social displays

Biomechanics of the peafowl’s crest reveals frequencies tuned to social displays

What Do We Learn from Good Practices of Biologically Inspired Design in Innovation?

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