Modal vibration analysis of a metal plate by using a laser vibrometer and the POD method

Moreno, D.; Barrientos, Bernardino; Pérez-López, Carlos; Santoyo, Fernando Mendoza

doi:10.1088/1464-4258/7/6/016

Cited by 83 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Laser vibrometers [12][13][14] have many advantages over similar devices used to measure vibrations such as accelerometers. Most laser vibrometers have unparalleled performance and capability testing tools built-in, high sensitivity and spatial resolution, and can automate testing processes to test different points of a structure.…”

Section: Introductionmentioning

confidence: 99%

Vibration Measurement Using Laser Triangulation for Applications in Wind Turbine Blades

Moreno‐Oliva¹,

Flores-Diaz

Román‐Hernández³

et al. 2021

Symmetry

View full text Add to dashboard Cite

The blades in a wind turbine are currently manufactured with flexible and light materials, which make them more susceptible to the effects of vibrations when the wind speed is high enough, causing fatigue damage, affecting the functionality of its structure and aerodynamic efficiency. This work presents a comparison of the modal vibration parameters, applied to a cantilever beam, determined with two experimental methods—the use of accelerometers and a proposed optical non-contact method—based on the principle of laser triangulation and photogrammetry techniques. This technique uses the geometric symmetry of the equidistant displacements along the z axis of the beam to obtain the amplitude data. Parameters such as natural frequency and modal form are obtained by fitting the data to a nonlinear equation with a solution which is an exponential/harmonic equation. Also, analytically, these parameters are determined, and a comparison is made between the experimental methods. The result shows that the relative error of the first-order natural vibration frequency is below 1%. The proposed method is simple, efficient, reliable, and it is also a method that has not been applied to the test of wind turbine blades, so its implementation as this type of wind turbine component is an area of opportunity for the validation of modal vibration parameters in the wind industry. An analysis of results is presented showing benefits of the proposed method and its limitations.

show abstract

Section: Introductionmentioning

confidence: 99%

Vibration Measurement Using Laser Triangulation for Applications in Wind Turbine Blades

Moreno‐Oliva¹,

Flores-Diaz

Román‐Hernández³

et al. 2021

Symmetry

View full text Add to dashboard Cite

show abstract

“…More recently other techniques that do not affect the dynamic characteristics of the tested structure have been applied. These techniques can be based on point measures, such as laser vibrometers, but also full-field techniques, such as scanning laser Doppler vibrometers (SLDV) or electronic speckle pattern interferometry (ESPI), can be employed [9]. Full-field techniques are more desirable than single-point ones because they cover the whole area to be analysed.…”

Section: Introductionmentioning

confidence: 99%

Model updating of uncertain parameters of carbon/epoxy composite plates using digital image correlation for full-field vibration measurement

et al. 2020

View full text Add to dashboard Cite

“…The modal shapes data of the metal plate or shell structures were also obtained. Pe´rez-Lo´pez et al 17 combined the laser vibrometer measurements with proper orthogonal decomposition (POD) method to decompose the vertical displacement velocity, so as to plot the POD modal shapes related to the resonant modes of an aluminum square plate. The experimental data were used to calculate the eigenfunctions and the eigenvalues of the plate.…”

Section: Introductionmentioning

confidence: 99%

Modal shape measurement of fiber-reinforced composite plate with high efficiency and precision based on laser linear scanning method

Yongle

et al. 2018

Measurement and Control

View full text Add to dashboard Cite

The laser linear scanning method is proposed to measure the modal shape of fiber-reinforced composite thin plate with high efficiency and precision. First, by establishing the laser scanning frame model of the composite plate, the corresponding extraction principle of modal shape data and laser scanning rate selection criterion are explained in detail to clarify the theoretical principle of laser linear scanning method. The corresponding test procedure of modal shape, drawing method from the shape scanning data, and control method of the constant laser scanning rate are also proposed based on the developed laser linear scanning system. Then, a TC300 carbon fiber/resin composite thin plate is taken as a research object to verify the effectiveness and reliability of such a method, through comparing the results obtained by the traditional experimental modal method and finite element method. Moreover, the influences of constraint boundary condition, excitation level, laser scanning rate, scanning spacing, scanning path mode, the fiber angles, and fiber material damage on modal shape results are also discussed. It has been found that laser linear scanning method can improve test efficiency of modal shape of the composite plate with high preciseness. Except for scanning path mode, the other parameters have a major impact on each shape morphology, and their effects can be quantitatively analyzed by identifying the positions and clarity of nodal lines of each modal shape. Especially, the high-density modal shape results and their equal amplitude lines in different projection views can be used to determine whether or not the composite plate is damaged as well as its damaged degrees.

show abstract

Modal vibration analysis of a metal plate by using a laser vibrometer and the POD method

Cited by 83 publications

References 8 publications

Vibration Measurement Using Laser Triangulation for Applications in Wind Turbine Blades

Vibration Measurement Using Laser Triangulation for Applications in Wind Turbine Blades

Model updating of uncertain parameters of carbon/epoxy composite plates using digital image correlation for full-field vibration measurement

Modal shape measurement of fiber-reinforced composite plate with high efficiency and precision based on laser linear scanning method

Contact Info

Product

Resources

About