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Efficient Full-Field Vibration Measurements and Operational Modal Analysis Using Neuromorphic Event-Based Imaging

Dorn, Charles and Dasari, Sudeep and Yang, Yongchao and Farrar, Charles and Kenyon, Garrett and Welch, Paul and Mascareñas, David (2018) Efficient Full-Field Vibration Measurements and Operational Modal Analysis Using Neuromorphic Event-Based Imaging. Journal of Engineering Mechanics, 144 (7). ISSN 0733-9399. doi:10.1061/(ASCE)EM.1943-7889.0001449.

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Traditional vibration measurement typically requires physically attached sensors, such as accelerometers and strain gauges. However, these discrete-point sensors provide only low spatial resolution vibration measurements, potentially foregoing valuable structural information such as localized damage. Noncontact optical measurement methods such as laser vibrometers can achieve high spatial resolution vibration measurements but only through time-consuming sequential measurements and are not cost-effective. As an alternative to traditional vibration measurement methods, digital video cameras are relatively low-cost, agile, and offer noncontact, simultaneous high spatial resolution measurements where every pixel on the structure becomes a measurement point. However, regular digital video cameras are frame-based where each pixel simultaneously performs temporally uniform (synchronous) measurements containing large amounts of redundant (background) data, which consumes considerable resources for video data measurement, management, and processing. To alleviate such a challenge, this work explores the use of event-based neuromorphic imagers, specifically silicon retinas, an efficient alternative to traditional frame-based video cameras, to perform full-field vibration measurements and operational modal analysis. By imitating biological vision, each silicon retina pixel independently and asynchronously records only intensity change events that contain structural motion information while excluding redundant (background) information. Such an asynchronous event-based data measurement mechanism allows for structural motion to be captured on the microsecond scale in an extremely data-efficient manner, which could benefit real-time vibration measurement and control applications. This study takes the first step toward these applications by formulating an existing video frame-based full-field operational modal analysis technique in the event-based, asynchronous silicon retina measurement framework. Specifically, local phase-based motion extraction and blind source separation are used to automatically and efficiently extract full-field vibration and dynamics parameters from silicon retina measurements. The developed method is validated by laboratory experiments on a bench-scale cantilever beam.

Item Type:Article
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URLURL TypeDescription
Dorn, Charles0000-0001-6516-2586
Dasari, Sudeep0000-0003-2600-2779
Yang, Yongchao0000-0003-1776-3306
Additional Information:© 2018 American Society of Civil Engineers. Received: January 24, 2017; Accepted: November 20, 2017; Published online: May 09, 2018.
Issue or Number:7
Record Number:CaltechAUTHORS:20180606-092601933
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86826
Deposited By: Tony Diaz
Deposited On:06 Jun 2018 16:33
Last Modified:15 Nov 2021 20:42

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