A Comparative Study of Laser Doppler Vibrometers for Vibration Measurements on Pavement Materials

Hasheminejad, Navid; Vuye, Cedric; Bergh, Wim van den; Dirckx, Joris J.J.; Vanlanduit, Steve

doi:10.3390/infrastructures3040047

Cited by 17 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In recent years, the advantages of SLDV have made it a suitable substitution for accelerometers in modal analysis of structures [16,17]. The ability of these instruments to conduct measurements on pavement has been proven in the literature [18,19].…”

Section: Methodsmentioning

confidence: 99%

“…After the preparation of beams B1 to B3, their front sides were painted by the white spray paint (Ardrox ® 9D1B aerosol by Chemetall, Frankfurt am Main, Germany) to improve the LDV measurement quality as suggested in the literature [19]. Next, the specimens were suspended from a small frame built for the climate chamber of the Universal Testing Machine (UTM) using two screw eyes and fishing lines to simulate free-free conditions.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Characterizing the Complex Modulus of Asphalt Concrete Using a Scanning Laser Doppler Vibrometer

et al. 2019

Self Cite

View full text Add to dashboard Cite

Asphalt mixtures are the most common types of pavement material used in the world. Characterizing the mechanical behavior of these complex materials is essential in durable, cost-effective, and sustainable pavement design. One of the important properties of asphalt mixtures is the complex modulus of elasticity. This parameter can be determined using different standardized methods, which are often expensive, complex to perform, and sensitive to the experimental setup. Therefore, recently, there has been considerable interest in developing new, easier, and more comprehensive techniques to investigate the mechanical properties of asphalt. The main objective of this research is to develop an alternative method based on an optical measurement technique (laser Doppler vibrometry). To do this, a frequency domain system identification technique based on analytical formulas (Timoshenko’s beam theory) is used to determine the complex modulus of asphalt concrete at its natural frequencies and to form their master curve. The master curve plotted by this method is compared with the master curve obtained from the standard four-point bending test, and it is concluded that the proposed method is able to produce a master curve similar to the master curve of the standard method. Therefore, the proposed method has the potential to replace the standard stiffness tests. Furthermore, the standard stiffness methods usually conduct experiments up to the maximum frequency of 30 Hz. However, the proposed method can provide accurate complex modulus at high frequencies. This makes an accurate comparison between the properties of the asphalt mixtures in high frequencies and the development of more accurate theoretical models for simulation of specimens possible.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Characterizing the Complex Modulus of Asphalt Concrete Using a Scanning Laser Doppler Vibrometer

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Érdekes megjegyezni, hogy Hasheminejad kutatócsapatának közelmúltban megjelent munkájában egy hagyományos hélium-neon (He -Ne) alapú LDV-t és a közelmúltban kifejlesztett infravörös lézeres regésmérőt hasonlítottak össze [52]. Különböző felületi viszonyok közt vizsgálva a lézerjelet megállapították, hogy a He-Ne LDV zajszintje magasabb, ha sötétebb, vagy rosszabb reflektivitású felületről (pl.…”

Section: áBra a Vibrométer Vázlatos Felépítéseunclassified

Lézeres mérések alkalmazása forgácsoláskor. Monitoring és a lézeres érzékelők

Béres

2020

MDT

View full text Add to dashboard Cite

A cikk célja, hogy néhány példán keresztül felvázolja azokat a lehetőségeket, amelyeket a lézeres mérések kínálnak fúrás, marás és esztergálás vizsgálatára. Olyan munka eddig nem jelent meg, amely a klasszikus forgácsolási technikák esetén külön-külön igyekszik összefoglalni az egyes hagyományos forgácsolásleválasztási technológiákra vonatkozó méréseket. Nem titkolt célja, hogy a lézeres méréstechnika előnyeit és hátrányait is bemutassa, figyelembe véve a mérési körülményeket is. Mindezeket a forgácsolás felügyeletben való alkalmazáshatóságának szem előtt tartásával kívánja bemutatni.

show abstract

“…As previously mentioned, the sensors used for response measurement are triaxial accelerometers. They were preferred over more sophisticated non-intrusive measurement equipment, such as laser doppler vibrometry (LDV) [20,21] for the different reasons listed below.…”

Section: Effect Of Sensor Mass Loadingmentioning

confidence: 99%

Hybrid Numerical-Experimental Model Update Based on Correlation Approach for Turbine Components

Saeed

Firrone

Berruti

2020

Volume 11: Structures and Dynamics: Structural Mechanics, Vibration, and Damping; Supercritical CO2

View full text Add to dashboard Cite

Bladed-disks in turbo-machines experience high cycle fatigue failures due to high vibration amplitudes. Therefore, it is important to accurately predict their dynamic characteristics including the mechanical joints at blade-disk (root joint) or blade-blade (shroud) interfaces. These joints help in dampening the vibration amplitudes. Before the experimental identification of these joints, it is of paramount importance to accurately measure the interface degrees-of-freedom (DoF). However, they are largely inaccessible for the measurements. For this reason, expansion techniques are used in order to update the single components before their coupling. But the expansion can be affected adversely if the measurements are not properly correlated with the updated model or if they have significant errors. Therefore, a frequency domain expansion method called System Equivalent Model Mixing (SEMM) is used to expand a limited set of measurements to a larger set of numerical DoF. Different measured models — termed the overlay models — are taken from an impact testing campaign of a blade and a disk and coupled to the numerical model according to the SEMM. The expanded models — termed the hybrid models — are then correlated with the validation channels in a round-robin way by means of Frequency Response Assurance Criteria (FRAC). The global correlations depict whether or not a measurement and the respective expansion is properly correlated. By this approach, the least correlated channels can be done away with from the measurements to have a better updated hybrid model. The method is tested on both the structures (the blade and the disk) and it is successfully shown that removing the uncorrelated channels does improve the quality of the hybrid models.

show abstract

A Comparative Study of Laser Doppler Vibrometers for Vibration Measurements on Pavement Materials

Cited by 17 publications

References 17 publications

Characterizing the Complex Modulus of Asphalt Concrete Using a Scanning Laser Doppler Vibrometer

Characterizing the Complex Modulus of Asphalt Concrete Using a Scanning Laser Doppler Vibrometer

Lézeres mérések alkalmazása forgácsoláskor. Monitoring és a lézeres érzékelők

Hybrid Numerical-Experimental Model Update Based on Correlation Approach for Turbine Components

Contact Info

Product

Resources

About