Contribution of Small Wind Turbine Structural Vibration to Noise Emission

Mollasalehi, Ehsan; Sun, Qiao; Wood, David

doi:10.3390/en6083669

Cited by 25 publications

(7 citation statements)

References 20 publications

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“…Further challenges are dictated by the ambition of employing micro-wind turbines in urban environments: in this context, the demand of mitigating noise and vibration is evidently more pressing, and, at the same time, the environment is complex and turbulent [8][9][10][11][12][13]. The strongly varying loads to which a micro-wind turbine can be subjected in an urban environment [14] can cause heavy stresses on all the components, with large noise [15][16][17][18] and vibrations and risks of damage and breakage of the device [19]. Further, the use of micro-wind turbines in urban environments, where the average wind intensity is commonly quite low and the turbulence structure might be complex, requires the optimization of the design of the blades [4] and of the performances near the start-up.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Vibrational Analysis of a Horizontal-Axis Micro-Wind Turbine

et al. 2018

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Micro-wind turbines are energy conversion technologies strongly affected by fatigue, as a result of their size and the variability of loads, induced by the unsteady wind conditions, and modulated by a very high rotational speed. This work is devoted to the experimental and numerical characterization of the aeroelastic behavior of a test-case horizontal-axis wind turbine (HAWT) with a 2 m rotor diameter and a maximum power production of 3 kW. The experimental studies have been conducted at the wind tunnel of the University of Perugia and consisted of accelerometer measurements at the tower and the tail fin. The numerical setup was the Fatigue, Aerodynamics, Structures, and Turbulence (FAST) code for aeroelastic simulations, which was fed as input with the same wind conditions employed in the wind tunnel tests. The experimental and numerical analyses were coupled with the perspective of establishing a reciprocal feedback, and this has been accomplished. On one hand, the numerical model is important for interpreting the measured spectrum of tower oscillations and, for example, inspires the detection of a mass unbalance at the blades. On the other hand, the measurements inspire the question of how to interpret the interaction between the blades and the tower. The experimental spectrum of tail fin vibrations indicates that secondary elements, in terms of weight, can also transmit to the tower, giving meaningful contributions to the vibration spectra. Therefore, an integrated numerical and experimental approach is not only valuable but is also unavoidable, to fully characterize the dynamics of small wind-energy conversion systems.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Vibrational Analysis of a Horizontal-Axis Micro-Wind Turbine

et al. 2018

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“…High TSRs present many drawbacks such as noise generation, high centrifugal forces because of the high rotational speeds and problems of vibration (Göçmen and Özerdem, 2012; Mollasalehi et al, 2013). As the maximum efficiency at the TSR does not considerably vary between 6 and 10, a TSR of 6 was selected.…”

Section: Small Wind Turbine Blade Structurementioning

confidence: 99%

Structural design and analysis of a small wind turbine blade using Simple Load Model, FAST-MLife codes, and ANSYS nCode DesignLife

et al. 2019

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This article presents a structural design and analysis of 11-kW small wind blades. The stress and the fatigue on the blades were computed using Simple Load Model from IEC 61400-2 standard, ANSYS nCode DesignLife, and FAST-MLife codes from the National Renewable Energy Laboratory. Simple Load Model gives good results in terms of stress analysis but overestimates fatigue damage on the blade. High safety factors imposed by the IEC 61400-2 standard, when full mechanical characterization of the blade material cannot be achieved, lead to heavy structures that impact the blade cost. For the same design, full computational analysis of the blade fatigue using FAST-MLife codes and the ANSYS nCode DesignLife revealed that the rotor blades will be safe against fatigue for a design lifetime of 20 years. This study shows that simple and reliable aeroelastic models are still needed for fatigue analysis of small wind blades.

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“…Internal losses by the vibration in operating conditions are one of the reasons for reducing the efficiency of wind turbine power generation. In addition, vibration occurs at a low frequency (≤10 Hz) [8]. Reducing vibrations are one of the solutions to minimize the maintenance cost of the wind turbine as well as higher power production.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Vertical Axis Wind Turbine Performance under Vibration

Sarkar

Julai

Nahar

et al. 2021

IJRCS

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An experimental study was conducted to study the effects of flow uniformity on vibration and power generation of a small vertical axis wind turbine (VAWT). Previous studies have confirmed that one of the sources of vibration in the turbine is due to aerodynamic forces, which are due to incident wind. Firstly, understanding vibration is essential before proceeding to the measurements. In this experiment, further understand the vibrations of the turbine in operation, the operating deflection shape (ODS) technique was used. A wind tunnel and flow conditioner were fabricated. Experimental modal analysis (EMA) was conducted, and the dynamic characteristics are gathered. The ODS was conducted for operating the turbine at different speeds, with and without the flow conditioner. Results from EMA and ODS are correlated to explain the behavior of structures. In conclusion, the flow conditioner tested did have a big impact on the response of the structure in terms of vibration up to 30% indifference, but not so much in power generated about 2% indifference.

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Contribution of Small Wind Turbine Structural Vibration to Noise Emission

Cited by 25 publications

References 20 publications

Experimental and Numerical Vibrational Analysis of a Horizontal-Axis Micro-Wind Turbine

Experimental and Numerical Vibrational Analysis of a Horizontal-Axis Micro-Wind Turbine

Structural design and analysis of a small wind turbine blade using Simple Load Model, FAST-MLife codes, and ANSYS nCode DesignLife

Experimental Study of Vertical Axis Wind Turbine Performance under Vibration

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