Combined analytical and experimental approaches to rotor components stress predictions

Chierichetti, Maria; McColl, Chance C.; Palmer, David A.; Ruzzene, Massimo; Bauchau, Olivier A.

doi:10.1177/1464419311408216

Cited by 8 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(9). Therefore for stationary stochastic processes this power spectral density function matrix among the outputs, G xx (ω), is…”

Section: B Operational Deflection Shapementioning

confidence: 99%

“…Load monitoring using strain sensors in the rotor blades has the advantage of providing load histories, that can be used to carry out lifetime estimations. 8,9 SHM typically utilizes sensors to give continuous online feedback of the components structural integrity 3 and the Enercon 4.5 MW, retro-fitted with a fibre optic FBG sensor array is an operative example. 10 Numerous inspection methods exist for composite materials, but the majority of inspection techniques are only suitable for postproduction inspection prior to blade fitting; acoustic emission monitoring and strain monitoring are the only currently available methods offering potential for continuous online monitoring for wind turbine rotor blade.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On-Condition Evaluation of How Inertial and Aerodynamic Characteristics Affect the Dynamics of a Small Wind Turbine System

Grappasonni

Coppotelli

Arsenault

et al. 2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

View full text Add to dashboard Cite

With the goal of developing system performance integrity monitoring tools for wind turbines the dynamic analysis of a small horizontal-axis wind turbine subjected to changes in the inertial and aerodynamic properties are investigated. The identification of the threeblade turbine modal properties, i.e. natural frequencies, damping ratios, and mode shapes, is provided for a rotor subjected to simulated operating conditions during wind tunnel tests. Several wind speeds and different angular speeds are considered by controlling the inflow to the rotor and its generated power. An identification procedure to infer about how dynamic properties are changing from the data recorded during the simulated operating conditions is developed. The operational deflection shape identification procedure proposed accounts for the presence of harmonic loading and uses dynamic strain measured from Fiber Bragg Grating (FBG) transducers bonded on the surface, suction side, of the three-blades wind turbine.

show abstract

“…(9). Therefore for stationary stochastic processes this power spectral density function matrix among the outputs, G xx (ω), is…”

Section: B Operational Deflection Shapementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On-Condition Evaluation of How Inertial and Aerodynamic Characteristics Affect the Dynamics of a Small Wind Turbine System

Grappasonni

Coppotelli

Arsenault

et al. 2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

View full text Add to dashboard Cite

show abstract

“…In addition, the focus is placed on the accuracy of the reconstructed response rather than the estimation of the load distribution. Description of the results of the proposed approach, here denoted as load confluence algorithm, on a onedimensional structure are found in Chierichetti et al [13] and for dynamic components (rotor blades) in a rotating environment in McColl et al [14] and Chierichetti et al [15]. This approach can also be modified to improve the numerical response by updating the physical properties of the system, as described in [16].…”

Section: Introductionmentioning

confidence: 97%

Dynamic displacement field reconstruction through a limited set of measurements: Application to plates

Chierichetti

Ruzzene

2012

Journal of Sound and Vibration

View full text Add to dashboard Cite

“…Chierichetti et al [38][39][40] used a confluence algorithm to extract the full-field dynamic response of several structures by using limited set of measured data. In this approach, an initial guess of the load is applied to the numerical model and the response of the structure due to the initial load is extracted.…”

mentioning

confidence: 99%

Extracting full-field dynamic strain on a wind turbine rotor subjected to arbitrary excitations using 3D point tracking and a modal expansion technique

Baqersad

Niezrecki

Avitabile

2015

Journal of Sound and Vibration

107

View full text Add to dashboard Cite

a b s t r a c tHealth monitoring of rotating structures such as wind turbines and helicopter rotors is generally performed using conventional sensors that provide a limited set of data at discrete locations near or on the hub. These sensors usually provide no data on the blades or inside them where failures might occur. Within this paper, an approach was used to extract the full-field dynamic strain on a wind turbine assembly subject to arbitrary loading conditions. A three-bladed wind turbine having 2.3-m long blades was placed in a semi-built-in boundary condition using a hub, a machining chuck, and a steel block. For three different test cases, the turbine was excited using (1) pluck testing, (2) random impacts on blades with three impact hammers, and (3) random excitation by a mechanical shaker. The response of the structure to the excitations was measured using threedimensional point tracking. A pair of high-speed cameras was used to measure displacement of optical targets on the structure when the blades were vibrating. The measured displacements at discrete locations were expanded and applied to the finite element model of the structure to extract the full-field dynamic strain. The results of the paper show an excellent correlation between the strain predicted using the proposed approach and the strain measured with strain-gages for each of the three loading conditions. The approach used in this paper to predict the strain showed higher accuracy than the digital image correlation technique. The new expansion approach is able to extract dynamic strain all over the entire structure, even inside the structure beyond the line of sight of the measurement system. Because the method is based on a non-contacting measurement approach, it can be readily applied to a variety of structures having different boundary and operating conditions, including rotating blades.

show abstract

Combined analytical and experimental approaches to rotor components stress predictions

Cited by 8 publications

References 10 publications

On-Condition Evaluation of How Inertial and Aerodynamic Characteristics Affect the Dynamics of a Small Wind Turbine System

On-Condition Evaluation of How Inertial and Aerodynamic Characteristics Affect the Dynamics of a Small Wind Turbine System

Dynamic displacement field reconstruction through a limited set of measurements: Application to plates

Extracting full-field dynamic strain on a wind turbine rotor subjected to arbitrary excitations using 3D point tracking and a modal expansion technique

Contact Info

Product

Resources

About