Spinning finite element analysis of longitudinally stiffened horizontal axis wind turbine blade for fatigue life enhancement

Sajeer, M. Mohamed; Mitra, Arka; Chakraborty, Arunasis

doi:10.1016/j.ymssp.2020.106924

Cited by 17 publications

(2 citation statements)

References 32 publications

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“…Figure 2 shows the schematic diagram of the velocity components and loads acting on an airfoil, where the local inflow angle

ϕ

is the sum of the angle of attack

α

and local pitch angle

θ_{p}

. The equations of the BEM theory are omitted here; the reader may refer to Sajeer et al 43,48 or Mitra and Chakraborty 44 for further details on this topic.…”

Section: External Loads On Wind Turbinementioning

confidence: 99%

Wavelet linear quadratic regulator‐based gain scheduling for optimal fore‐aft vibration control of horizontal axis wind turbine tower using active tuned mass damper

Mitra

Giridharan

Chakraborty

2022

Structural Contr & Hlth

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This paper presents a wavelet-based strategy for fore-aft vibration control of onshore horizontal axis wind turbine tower. For this purpose, an active tuned mass damper is combined with an aero-servo-elastic turbine model in the multi-body framework. The combined system is exposed to turbulent wind and seismic ground motion to investigate the controller performance in extreme operating conditions. The optimal tuning is achieved by frequencydependent gain scheduling via wavelet transform. Analytic Morse wavelet is used as a basis function for transforming the input and feedback to recast the classical linear quadratic regulator (LQR) in the time-frequency domain over a finite time horizon. The scale-dependent differential Riccati equations are solved for optimal gains, which are used to estimate the optimal control force.Numerical studies presented in this paper demonstrate the advantage of the proposed gain scheduling over classical LQR. The efficiency of the proposed algorithm is verified using different flow conditions and seismic input, where the performance is compared with benchmark results.active tuned mass damper, continuous wavelet transform, horizontal axis wind turbine, LQR control, Riccati equation | INTRODUCTIONGlobal wind power generation has experienced rapid growth in the recent past due to the ever-increasing demand for carbon-free renewable energy. As the power production of a horizontal axis wind turbine (HAWT) depends on its rotor area, modern multi-megawatt turbines are taller to accommodate ultra-large blades. These slender towers undergo severe vibration when exposed to in-flowing wind. Thus, tower vibration control is an essential component for safe and sustained operation. It helps to provide a stable platform at the tower top, which is a primary requirement for housing the generator, drive-train and rotor assembly. For this purpose, various control strategies (i.e., passive or active/semiactive) are proposed in the literature. [1][2][3][4] Among them, passive devices (e.g., ball/roller dampers, 5 tuned mass damper, 6 liquid dampers 7,8 and tuned liquid column damper [9][10][11] ) are relatively simpler as they do not need external power and real-time monitoring. Tuned mass damper, in particular, has been adopted by the wind turbine industry for commercial use. [12][13][14] These controllers are installed inside the nacelle, which has one degree of freedom corresponding to the mass of this passive device. It is tuned to the fundamental frequency of the tower and hence absorbs a significant amount of energy from the primary structure (i.e., HAWT) using resonance. TMD has been used in mitigating wind-induced

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“…Figure 2 shows the schematic diagram of the velocity components and loads acting on an airfoil, where the local inflow angle

ϕ

is the sum of the angle of attack

α

and local pitch angle

θ_{p}

. The equations of the BEM theory are omitted here; the reader may refer to Sajeer et al 43,48 or Mitra and Chakraborty 44 for further details on this topic.…”

Section: External Loads On Wind Turbinementioning

confidence: 99%

Wavelet linear quadratic regulator‐based gain scheduling for optimal fore‐aft vibration control of horizontal axis wind turbine tower using active tuned mass damper

Mitra

Giridharan

Chakraborty

2022

Structural Contr & Hlth

Self Cite

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“…Scott et al [39] used experimental setup to measure the impact of partial wake on the downwind turbines, whereas Howland et al [40] provided partial wake statistics for a typical wind farm and showed the means, to a certain degree, to use the mechanical controls of turbines to avoid partial wake coverage (wake steering, see [21]). The physical aspects of fatigue load and the appropriate countermeasures have been vividly discussed in the literature recently, e.g., by Sajeer et al [41], Rong et al [42], and Huo and Huo and Tong [43]. The groundwork has been analyzed and presented in detail by Burton et al [44].…”

Section: Wake Asymmetric Thrust Loadmentioning

confidence: 99%

Advances in Wind Farm Layout Optimization: Wind Direction Robustness and Wake Induced Asymmetric Thrust Load

Croonenbroeck¹,

Hennecke²

2021

JEPT

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In this study, we address the wind farm layout optimization (WFLO) problem and tackle the issue of optimal turbine placement by incorporating additional aspects of an economically driven target function. Firstly, we have analyzed the effect of wind direction on a given turbine arrangement. Based on the direction-dependent wake pattern, practitioners sometimes shut down certain turbines on their farms. Our method computes which turbines should be shut down in which wake situation. On this basis, we have developed a method of finding new turbine setups that rarely require shutdowns and are, in a certain sense, “robust” against changes to the wind direction. Secondly, we have presented a partial coverage Jensen wake model in three-dimensional space and have provided the tools for reducing or avoiding wake-induced asymmetric thrust on the rotor disc of the turbine, which leads to reduced energy yield and accelerated wear. This aspect can also be used for finding new turbine setups that take partial coverage into account and avoid it if necessary. Overall, the application of the refinements suggested in this study will result in an increased yearly profit achieved from the produced energy in a wind farm. This is an aspect that decision-makers, such as farm planners/operators, might depend on in a market that typically possesses narrow profit margins. Our methods find entrance into the open-source research framework that comes as the package wflo for the statistical software R.

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Epoxy/silicon carbide (sic) nanocomposites based small scale wind turbines for urban applications

Appadurai¹,

Raj²

2021

Int J Energy Environ Eng

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Spinning finite element analysis of longitudinally stiffened horizontal axis wind turbine blade for fatigue life enhancement

Cited by 17 publications

References 32 publications

Wavelet linear quadratic regulator‐based gain scheduling for optimal fore‐aft vibration control of horizontal axis wind turbine tower using active tuned mass damper

Wavelet linear quadratic regulator‐based gain scheduling for optimal fore‐aft vibration control of horizontal axis wind turbine tower using active tuned mass damper

Advances in Wind Farm Layout Optimization: Wind Direction Robustness and Wake Induced Asymmetric Thrust Load

Epoxy/silicon carbide (sic) nanocomposites based small scale wind turbines for urban applications

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