Six degrees of freedom measurement with continuous scanning laser doppler vibrometer

Giuliani, P.; Maio, Dario Di; Schwingshackl, Christoph W.; Martarelli, Milena; Ewins, D. J.

doi:10.1016/j.ymssp.2013.01.004

Cited by 29 publications

(15 citation statements)

References 9 publications

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“…The angle β, as shown in Figure 2, is equal to π /2 and so all cosine terms are equal to 1, this is the reason why it will not be present in the mathematical descriptions; see Ref. 8 for additional information.…”

Section: Measurement Of 6 Degrees Of Freedom At Measurement Pointmentioning

confidence: 99%

“…8 This section presents and compares the two manufactured scanning devices: (i) a prototype used for measuring the in-plane rotational vibrations and (ii) the development of a more compact and robust scanner for practical engineering applications.…”

Section: Dof Scanning Devicementioning

confidence: 99%

“…Repeated measurements were carried out at a frequency of 80 Hz, and a maximum error of 1.3% between the manually calibrated and the extracted angle ϕ was detected, see Ref. 8 for further details. A similar calibration procedure was set up for the new 6DOF scanning device.…”

Section: A Calibrationmentioning

confidence: 99%

“…This angle is identified in Ref. 8 as the angle β. The angle ϕ, presented in Figure 1, was set to 0 • because the in-plane rotation measurement was not required.…”

Section: Application Of the Dof Scanner To Engineering Test Casementioning

confidence: 99%

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Experimental validation of a newly designed 6 degrees of freedom scanning laser head: Application to three-dimensional beam structure

Maio

Copertaro

2013

Review of Scientific Instruments

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A new scanning laser head is designed to use single Laser Doppler Vibrometer (LDV) for performing measurements up to 6 degrees of freedom (DOF) at a target. The scanning head is supported by a rotating hollow shaft, which allows the laser beam to travel up to the scanning head from an opposite direction where an LDV is set up. The scanning head is made of a set of two mirrors, which deflects the laser beam with an angle so that the rotation of the scanning head produces a conical scan. When measurements are performed at the focal point of the conical scan then three translational vibration components can be measured, otherwise the very small circle scan, before and after the focal point, can measure up to 6 degrees of freedom, including three translations and three rotations. This paper presents the 6DOF scanning head and the measurements of 3D operational deflection shapes of a test structure.

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Section: Measurement Of 6 Degrees Of Freedom At Measurement Pointmentioning

confidence: 99%

Section: Dof Scanning Devicementioning

confidence: 99%

Section: A Calibrationmentioning

confidence: 99%

“…This angle is identified in Ref. 8 as the angle β. The angle ϕ, presented in Figure 1, was set to 0 • because the in-plane rotation measurement was not required.…”

Section: Application Of the Dof Scanner To Engineering Test Casementioning

confidence: 99%

See 2 more Smart Citations

Experimental validation of a newly designed 6 degrees of freedom scanning laser head: Application to three-dimensional beam structure

Maio

Copertaro

2013

Review of Scientific Instruments

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“…In this latter case, post-processing of the measured velocity results in a series of coefficients that describe the operational deflection shape (ODS) or the mode shape. [8][9][10][11][12][13][14] If the scan frequency is synchronised with the target motion frequency, it is possible to perform a tracking laser vibrometer measurement in which the probe laser beam remains fixed on a particular point on the target. 15 Tracking measurements have been performed on a number of rotor applications, [15][16][17] as well as on belts (partial track) 18 and on targets with oscillating parts fixed to a component with a large whole body motion such as windscreen wipers.…”

Section: Introductionmentioning

confidence: 99%

Development of a scanning head for laser Doppler vibrometry (LDV) using dual optical wedges

Rothberg

Tirabassi

2013

Review of Scientific Instruments

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A new laser Doppler vibrometry scanning head is proposed based on a pair of rotating optical wedges. A comprehensive mathematical model is developed and used to demonstrate how the wedges can be configured to scan point-by-point, in a line, in a circle, and in a combination of the two such that a straight line scan could be performed on a structure during rotation. Inevitable misalignments are incorporated into the model and considered quantitatively for the circular tracking application. Certain advantages are apparent over systems based on dual mirrors and a Dove prism in terms of lower apparent velocities at low rotation orders. A scanning head design for the circular tracking application is presented, together with experimental data showing good agreement between predicted and measured apparent velocities caused by misalignments.

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Toward Robust Response Models: Theoretical and Experimental Issues

Maia

Urgueira

Almeida

et al. 2022

Handbook of Experimental Structural Dynamics

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Six degrees of freedom measurement with continuous scanning laser doppler vibrometer

Cited by 29 publications

References 9 publications

Experimental validation of a newly designed 6 degrees of freedom scanning laser head: Application to three-dimensional beam structure

Experimental validation of a newly designed 6 degrees of freedom scanning laser head: Application to three-dimensional beam structure

Development of a scanning head for laser Doppler vibrometry (LDV) using dual optical wedges

Toward Robust Response Models: Theoretical and Experimental Issues

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