3-D Vibration Measurement Using a Single Laser Scanning Vibrometer by Moving to Three Different Locations

Kim, Dongkyu; Song, Hajun; Khalil, Hossam; Lee, Jongsuh; Wang, Semyung; Park, Kyihwan

doi:10.1109/tim.2014.2302244

Cited by 24 publications

(5 citation statements)

References 8 publications

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“…The 3D vibration measurements of the MPV and the SLDV work on the same principle. The 3D velocity vector is calculated by a coordinate transformation [35,36]. The transformation matrix contains Euler angles of the directions of the laser beams.…”

Section: Measurement Setupmentioning

confidence: 99%

Non-Contact Damage Detection under Operational Conditions with Multipoint Laservibrometry

Cao

Rembe

2020

Sensors

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Scanning laser–Doppler vibrometry (SLDV) can localize and visualize damages in mechanical structures. In order to enable scanning, it is necessary to repeat the vibration. Therefore, this technique is not suited to detect emerging hazards in working machinery that change the vibration behavior. A common technique for such cases is monitoring the vibration excited by machine operation with accelerometers. This technique requires mechanical coupling between sensors and the measurement object, which influences the high-frequency vibration responses. However, in the low-frequency range, local damages do not shift resonances or distort operational deflection shapes (ODS) significantly. These alterations in the vibration behavior are tiny and hard to detect. This paper shows that multipoint laservibrometry (MPV) with laser excitation can measure these effects efficiently, and it further demonstrates that damages influence ODSs at frequencies above 20 kHz much stronger than at frequencies below 20 kHz. In addition, ODS-based damage indices are discussed; these are highly sensitive to minute visible changes of the ODSs. In order to enhance the sensitivity of hazard detection, the response vector assurance criterion value is computed and evaluated during operation. The capabilities and limitations of the methodology on the example of a cantilever with manually emerging damage are demonstrated.

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Section: Measurement Setupmentioning

confidence: 99%

Non-Contact Damage Detection under Operational Conditions with Multipoint Laservibrometry

Cao

Rembe

2020

Sensors

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“…As the LDV measures the instantaneous velocity in the direction of its laser beam, one has to perform the velocity measurement for a number of laser incidence angles in order to retrieve the three components of the velocity. As a consequence, either the SLDV head has to be moved [11,12] or three LDVs have to be used simultaneously [13], thus leading to a high price of the overall setup. Moreover, these solutions requires a number of manual handling steps that limit the number of points that can be measured.…”

Section: Introductionmentioning

confidence: 99%

The robotized laser doppler vibrometer: On the use of an industrial robot arm to perform 3D full-field velocity measurements

Margerit

Gobin

Lebée

et al. 2021

Optics and Lasers in Engineering

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“…Unfortunately, both the spatial resolution and the accuracy of the used 3D cameras is too low to allow an accurate pose estimation. Kim et al [13] made use of a more accurate (but also more expensive) laser scanner.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional full-field vibration measurements using a handheld single-point laser Doppler vibrometer

Sels

Vanlanduit

Bogaerts

et al. 2019

Mechanical Systems and Signal Processing

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The laser Dopper vibrometer (LDV) has become a standard instrument to perform high spatial resolution 3D vibration measurements of complex structures.An important step in the LDV measurement procedure is the estimation of the pose of the instrument relative to the test object. Existing LDV pose estimation methods rely on the use of 3D range sensors to perform this task. These sensors are costly and often their spatial resolution and accuracy is too limited for an accurate LDV pose estimation. But most importantly, existing LDV pose estimation techniques are slow. In this paper, we present a novel LDV pose estimation method based on matching of a 2D camera image and a CAD model of the test object. In contrast to existing pose estimation techniques, our method is able to track the pose of the LDV in real-time (up to about 30 LDV positions per second). This means that our method also allows LDV pose estimation when either the LDV or the object is moving. Using the real-time LDV pose tracking we present a new LDV measurement methodology where we hold instrument in our hand while moving around the test structure. This allows us to perform full-field scanning and 3D velocity measurements with a low-cost single point LDV sensor. We show that the measurement accuracy of a stationary handheld LDV measurement is about 40dB (which is about 10dB lower than in the case of measurements on a tripod). Furthermore, we demonstrate that the 3D vibrations measurements using the handheld vibrometer have an error of about 20% compared to classical measurements performed by combining three LDV measurements on a tripod. We illustrate our method on vibration measurements of

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3-D Vibration Measurement Using a Single Laser Scanning Vibrometer by Moving to Three Different Locations

Cited by 24 publications

References 8 publications

Non-Contact Damage Detection under Operational Conditions with Multipoint Laservibrometry

Non-Contact Damage Detection under Operational Conditions with Multipoint Laservibrometry

The robotized laser doppler vibrometer: On the use of an industrial robot arm to perform 3D full-field velocity measurements

Three-dimensional full-field vibration measurements using a handheld single-point laser Doppler vibrometer

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