Modelling and characteristics analysis of the pitch system of large scale wind turbines

Dai, J-C; Hu, Y-P; Liu, D-S; Long, Xin

doi:10.1243/09544062jmes2257

Cited by 12 publications

(9 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although some insights have been gained in this work, only the amplitude modulation is considered. More efforts can be made to identify the source of additional harmonics induced by frequency modulation, and in particular the connections between the mesh and sideband vibrations of the helical ring gears when incorporating the base motions [56], worm gear [57], and even integrated system [58].…”

Section: Relation Between Mesh and Sideband Vibrationsmentioning

confidence: 99%

Investigation on Mesh and Sideband Vibrations of Helical Planetary Ring Gear Using Structure, Excitation and Deformation Symmetries

Wang

Meesap

2018

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

Time-variant excitations in planetary gear trains can cause excessive noise and vibration and even damage the system on a permanent basis. This paper focuses on the elastic vibrations of a helical planetary ring gear subjected to mesh and planet-pass excitations. Motivated by the structure, excitation and deformation symmetries, this paper proposes dual-frequency superposition and modulation methods to capture the mesh and sideband vibrations. The transition between ring gear tooth and planet is introduced to address the excitations and vibrations. The phasing effect of ring gear tooth and planet on various deformations is formulated. The inherent connections between the two types of vibrations are identified. The vibrations share identical exciting rules and the wavenumber and modulating signal order both equal the linear combination of tooth and planet counts. The results cover in-plane bending and extensional, out-of-plane bending and torsional deformations. Main findings are verified by numerical calculation and comparisons with the open literature. The analytical expressions can be used to determine whether the sideband is caused by component fault or only by elastic vibration. The methods can be extended to other power-transmission systems because little restriction is imposed during the analysis. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

show abstract

Section: Relation Between Mesh and Sideband Vibrationsmentioning

confidence: 99%

Investigation on Mesh and Sideband Vibrations of Helical Planetary Ring Gear Using Structure, Excitation and Deformation Symmetries

Wang

Meesap

2018

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…Apart from the PM motors, there exist abundant cyclically symmetric power-transmission systems in diverse branches of practical engineering, typically including turbine machines [32] and planetary gears [27,28,33], as shown in Fig. 10.…”

Section: Expanding Application To Cyclically Symmetric Systemsmentioning

confidence: 99%

Analytical Treatment With Rigid-Elastic Vibration of Permanent Magnet Motors With Expanding Application to Cyclically Symmetric Power-Transmission Systems

Wang

Xiu

Cao

et al. 2014

Journal of Vibration and Acoustics

View full text Add to dashboard Cite

The phasing effect of the slot/magnet combination on rigid-elastic vibration is addressed by incorporating the cyclic symmetry of permanent magnet (PM) motors. Expanding research is also carried out to achieve more general findings in rotary power-transmission systems widely available in practical engineering. To these aims, model-free analysis is used to deal with the effect via superposition treatment. The results imply that the vibration induced by temporal-spatial excitation can be classified into rotational, translational, and balanced modes, all of which have rigid and elastic vibrations having specific base and/or contaminated deflections, and the elastic vibration can be of the standing, forward traveling, and backward traveling waves. These modes can be suppressed or excited depending on whether particular algebraic relationships are satisfied by slot/magnet combination, excitation order, and base and contaminated wave numbers. Since the analysis is independent of any models, specified magnetic force, and rigid-elastic vibration, analytical results regarding the expected relationships can be naturally created due to the structural and force symmetries of the PM motors. Because of this, similar results can be found for other rotary systems basically consisting of a rotary rotor and a stationary stator both having equally-spaced features, apart from the PM motors, typically including the turbine machines having fluid field and planetary gears with a mechanical contact. As an engineering application, the proposed method can serve as a fundamental tool when predicting or even suppressing the possible excitations associated with particular vibration modes in the mechanical and electrical designs of the symmetric systems. The superposition effect and analytical predictions are verified by the finite element method and strict comparisons against those from disk-shaped structures in an existing study.

show abstract

“…Theorem 2: The estimator in (19) ensures that asymptotic tracking is obtained, in the sense that Ẋ (t) , Ẍ (t) , r(t) → 0 as t → ∞.…”

Section: Lemma 1: Let the Auxiliary Function L(t) ∈ R Be Defined Asmentioning

confidence: 99%

“…After substituting (19) and performing simple algebraic manipulations,V 1 (t) can be upper bounded bẏ…”

Section: Appendix 3: Proof Of Theoremmentioning

confidence: 99%

See 1 more Smart Citation

Optimum seeking-based non-linear controller to maximise energy capture in a variable speed wind turbine

Iyasere

Salah

Dawson

et al. 2012

IET Control Theory Appl.

View full text Add to dashboard Cite

Abstract:In this study, an optimum seeking-based robust non-linear controller is proposed to maximise wind energy captured by variable speed wind turbines at low-to-medium wind speeds. The proposed strategy simultaneously controls the blade pitch angle and tip-speed ratio, through the turbine rotor angular speed, to an optimal point at which the power coefficient, and hence the wind turbine efficiency, is maximum. The optimal points are given to the controller by an optimisation algorithm that seeks the unknown optimal blade pitch angle and rotor speed. The control method allows for aerodynamic rotor power maximisation without exact knowledge of the wind turbine model. A representative numerical simulation is presented to show that the wind turbine can be accurately controlled to achieve maximum energy capture.

show abstract

Modelling and characteristics analysis of the pitch system of large scale wind turbines

Cited by 12 publications

References 8 publications

Investigation on Mesh and Sideband Vibrations of Helical Planetary Ring Gear Using Structure, Excitation and Deformation Symmetries

Investigation on Mesh and Sideband Vibrations of Helical Planetary Ring Gear Using Structure, Excitation and Deformation Symmetries

Analytical Treatment With Rigid-Elastic Vibration of Permanent Magnet Motors With Expanding Application to Cyclically Symmetric Power-Transmission Systems

Optimum seeking-based non-linear controller to maximise energy capture in a variable speed wind turbine

Contact Info

Product

Resources

About