Energy balance in self-powered MR damper-based vibration reduction system

Snamina, Jacek; Sapiński, Bogdan

doi:10.2478/v10175-011-0011-4

Cited by 15 publications

(13 citation statements)

References 6 publications

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“…Among them, magnetorheological (MR) TVAs are placed, 15 as using an MR damper instead of a viscous one guarantees wide range of resistance force, millisecond response time, high operational robustness including lower sensitivity to temperature change and minor energy requirements as compared with active systems. [16][17][18][19][20][21][22][23] Simulations and experiments show that implementation of an MR damper in the TVA system may lead to further vibration reduction in relation to passive TVA. [24][25][26][27] Within the scope of the current project, a specially developed and built tower-nacelle laboratory model ( Figure 1) was made, in which all turbine components (a nacelle, blades, a hub, a shaft, a generator and possibly a gearbox) are represented by nacelle concentrated mass.…”

Section: Introductionmentioning

confidence: 99%

Control of a magnetorheological tuned vibration absorber for wind turbine application utilising the refined force tracking algorithm

Martynowicz

2017

Journal of Low Frequency Noise, Vibration and Active Control

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This work covers selected control issues, including refined force tracking algorithm formulation, concerning the wind turbine tower-nacelle laboratory model equipped with a magnetorheological damper based tuned vibration absorber. The objective of the current research is a development and experimental implementation of the control algorithm that couples basic adaptive stiffness solution with stock magnetorheological damper force tracking concept to obtain a quality tower vibration reduction system. The experiments were conducted assuming monoharmonic, horizontal excitation applied to the assembly modelling the nacelle. The frequency range comprised the neighbourhood of the first bending mode of the tower-nacelle system. The results proved the effectiveness of the adopted algorithm referring to other high-performance solutions.

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Section: Introductionmentioning

confidence: 99%

Control of a magnetorheological tuned vibration absorber for wind turbine application utilising the refined force tracking algorithm

Martynowicz

2017

Journal of Low Frequency Noise, Vibration and Active Control

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“…Helical springs, widely used in machine building [1][2][3][4], are often exposed to operations under the influence of dynamic forces of a wide range of frequencies. Work under circum-resonant conditions, due to the negligible damping properties of steel, can cause spring vibrations of high amplitudes.…”

Section: Introductionmentioning

confidence: 99%

Natural transverse vibrations of helical springs in sections covered with elastic coatings

Michalczyk

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. It has been demonstrated in previous studies that local elastomer coatings covering the end coils of helical springs can efficiently reduce the amplitudes of circum-resonant vibrations in such springs. The analysis of the influence that elastic coatings have on the frequencies and modes of natural transverse vibrations of springs is presented in this paper. The concept of the equivalent beam of the Timoshenko type is utilized in calculations of the frequencies and modes of transverse vibrations. The model developed allows users to determine the frequencies and modes of symmetric as well as antisymmetric vibrations of axially loaded springs with elastic coatings of arbitrary length. A comparison of the results obtained using FEM analysis, in which the model represented the actual spring geometry, with the results obtained by means of the presented model indicates its high accuracy. model of a spatially curved rod, the model of an equivalent rod or beam, and the model in which a continuous system, such as a spring, is substituted by a discrete-periodic system consisting of concentrated masses joined by a mass-less stiffness, jointly representing one spring coil or its fragment. Equations of motion are written for an elementary fragment of a spring wire in the first model. Such a formulation of the problem [12, 13] allows arbitrary modes and frequencies of spring vibrations to be determined, however, solving it by analytical methods is very difficult and therefore such a solution is not suitable in practical applications. These difficulties mean that in several studies concerning the analysis of spring vibrations treated as a spatially curved rod, the authors use numerical methods. New finite elements, capable of modeling spring coils or their fragments were proposed in [14]. They are suitable for application in static problems as well as when looking for natural frequencies of helical springs. Mottershead provided, in the above-mentioned paper, experimental results later utilized by other authors. A similar approach to the problems of helical springs was presented in [15][16][17]. Pearson expanded -in [18] -equations provided by Wittrick [13], taking into account the influence of a static axial force. For determining natural vibrations, he applied the transfer matrix method. The same method was used in [19], concerning the analysis of parameters influencing natural frequencies of helical springs (utilizing the Cayley-Hamilton theorem), and in [20]. In this last paper, the authors compared their results with the results obtained on the basis of the Haringx model [21]. They pointed out that, in the case of helical springs with geometrical parameters, typical of springs used in machine buildings, the conformity between the results obtained by them and the results obtained using the Haringx model is high. In the numerical example quoted by them, for which the first 16 natural frequencies were determined, the maximum difference between their results and the ones from the Haringx model did not exceed 1.3%. In ...

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“…Passive TVAs work well at the load conditions characterised with a single frequency to which they are tuned, but cannot adapt to a wider excitation spectrum (Kirkegaard et al, 2002), thus more advanced TVAs are implemented to change/tune TVA operating frequency. Among them, magnetorheological (MR) TVAs are placed (Kirkegaard et al, 2002), as the use of MR damper (instead of viscous damper) guarantees a wide range of the resistance force, fast response times, low sensitivity to temperature changes and fluid contamination, high operational robustness, and minor energy requirements (Kciuk and Martynowicz, 2011;Lord Rheonetic, 2002;Rosół, 2007, 2008; Snamina and Sapiński, 2011; Sapiń-ski and Martynowicz, 2005) as compared to active systems. Simulations and experiments show that the implementation of the MR damper in the TVA system may lead to further vibration reduction in relation to the passive TVA (Martynowicz, 2014b(Martynowicz, , 2015(Martynowicz, , 2016Koo and Ahmadian, 2007).…”

Section: Introductionmentioning

confidence: 99%

Implementation of the LQG controller for a wind turbine tower-nacelle model with an mr tuned vibration absorber

Rosół¹,

Martynowicz²

2016

jtam

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Vibration of a wind turbine tower is related to fatigue wear, influencing reliability of the whole structure. The current paper deals with the problem of Linear-Quadratic-Gaussian (LQG) tower vibration control using specially designed and built simulation and laboratory tower-nacelle models with a horizontally aligned, magnetorheological (MR) damper based tuned vibration absorber located at the nacelle. Force excitation applied horizontally to the tower itself, or to the nacelle, is considered. The MR damper LQG control algorithm, including the Kalman state observer and LQR (Linear-Quadratic-Regulator) controller is analysed numerically and implemented on the laboratory ground, in comparison with the system with a deactivated absorber. Simulation and experimental results are presented.

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Energy balance in self-powered MR damper-based vibration reduction system

Cited by 15 publications

References 6 publications

Control of a magnetorheological tuned vibration absorber for wind turbine application utilising the refined force tracking algorithm

Control of a magnetorheological tuned vibration absorber for wind turbine application utilising the refined force tracking algorithm

Natural transverse vibrations of helical springs in sections covered with elastic coatings

Implementation of the LQG controller for a wind turbine tower-nacelle model with an mr tuned vibration absorber

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