Modal Parameters from a Wind Turbine Wing by Operational Modal Analysis

Herlufsen, H.; Møller, Niels; Brincker, Rune; Andersen, Palle

doi:10.4271/2003-01-3049

Cited by 4 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The OMA is used for the modal identification with high precision under typical operating conditions [7]. The following are some of the main advantages of the OMA:…”

Section: Introductionmentioning

confidence: 99%

Identification of the technical state of suspension elements in railway systems

Martinod

Betancur

Heredia

2012

Vehicle System Dynamics

View full text Add to dashboard Cite

The running safety and passenger comfort levels in a vehicle are tightly related to the technical state of the suspension elements. The technical state of the suspension depends of the service life time as its components become old and wear out. In this paper, a study on the dynamic behaviour of a railway vehicle is established in relation to the damping elements in one of its suspension stages. An experimental measurement model is developed, obtaining a set of useful signals for the identification of the dynamic parameters of the vehicle and developing a test through the application of the operational modal analysis technique, using least-squares complex exponential method as a basis to validate the numerical model of the multi-body system. Then, the study focuses on developing numerical simulations for the identification of the technical state of the dampers by the registration of dynamic variables under commercial service conditions and on estimating the state of the suspension elements.

show abstract

“…The OMA is used for the modal identification with high precision under typical operating conditions [7]. The following are some of the main advantages of the OMA:…”

Section: Introductionmentioning

confidence: 99%

Identification of the technical state of suspension elements in railway systems

Martinod

Betancur

Heredia

2012

Vehicle System Dynamics

View full text Add to dashboard Cite

show abstract

“…Both techniques were compared in a study and a strong correlation was observed [4]. Meller et al [5] compared FDD and SSI techniques to the traditional modal analysis for mechanical rotating machines. OMA algorithms are stochastic in nature, however mechanical applications such as rotating machineries are subject to deterministic harmonic excitations from parts of the machinery.…”

Section: Introductionmentioning

confidence: 99%

Identification of Modal Properties of Composite Thin Plate Using OMA in Wind Tunnel Environment

Saffry

Majid

Romli

et al. 2013

AMM

View full text Add to dashboard Cite

Identification of modal parameters is crucial especially in aerospace applications whereby the interactions of airflow with aircraft structures can result in undesirable structural deformations. This structural deformation can be predicted with knowledge of the modal parameters. This can be achieved through conventional modal testing that requires a known excitation force in order to extract these dynamic properties. This technique can be experimentally complex because of the need for artificial excitation and it also does not represent actual operational condition. The current work presents part of research work that address the practical implementation of operational modal analysis (OMA) applied to a cantilevered hybrid composite plate exposed to low speed airflow in a wind tunnel. A single contactless sensing system via a laser vibrometer is employed to measure the response. OMA technique applied in a wind-on condition succeeded in extracting the modal parameters of the hybrid composite plate which correlate well with modal testing using impact hammer excitation.

show abstract

“…This method is also called feature extraction method [4]. Besides Experimental Modal Analysis (EMA), OMA is an alternative of modal analysis method which used advanced signal processing tools to determined properties of mechanical structures such as frequency, damping ratios and mode shapes by utilizing measuring response of structure without using artificial excitation [5][6][7][8].OMA is also economical and fast to conduct.Due to these advantages, OMA is widely used in many engineering applications. Operational Modal Analysis (OMA) is widely used in civil structures such as buildings [9][10][11] and bridges [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Operational Modal Analysis (OMA) is widely used in civil structures such as buildings [9][10][11] and bridges [12][13][14]. This technique also applied in mechanical [15][16][17] and aerospace engineering applications [6][7].…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of Operational Modal Analysis (OMA) for Detecting Saw Cut Damage in Fiberglass Reinforced Epoxy

Rahman

Isa

2013

AMM

View full text Add to dashboard Cite

This study attempts to apply vibration based damage detection method specifically operational modal analysis (OMA) on fiberglass reinforced epoxy plate. OMA is used on undamaged fiber glass reinforced epoxy plate to extract the modal parameters and after which the procedure is extended to saw cut damage fiberglass reinforced epoxy plate. Both healthy and damaged composite material are tested for different boundary conditions i.e. free-free on 4 edges, 1 edge clamped, 2 edges clamped, 3 edges clamped and 4 edges clamped condition. Then result of frequency from OMA was compared analytically with finite element method. Based on the results, it shows that a high deviation between OMA and finite element method can be observed. Result of frequency from OMA was then compared with Experimental Modal Analysis (EMA) to validate the effectiveness of OMA method. It is shown that results obtained from OMA are in good correlation with results obtained from EMA.

show abstract

Modal Parameters from a Wind Turbine Wing by Operational Modal Analysis

Abstract: Operational Modal Analysis also known as Ambient

Cited by 4 publications

References 2 publications

Identification of the technical state of suspension elements in railway systems

Identification of the technical state of suspension elements in railway systems

Identification of Modal Properties of Composite Thin Plate Using OMA in Wind Tunnel Environment

The Effectiveness of Operational Modal Analysis (OMA) for Detecting Saw Cut Damage in Fiberglass Reinforced Epoxy

Contact Info

Product

Resources

About