Application of Particle Dampers on a Scaled Wind Turbine Generator to Improve Low-Frequency Vibro-Acoustic Behavior

Prasad, Braj Bhushan; Duvigneau, Fabian; Juhre, Daniel; Woschke, Elmar

doi:10.3390/app12020671

Cited by 9 publications

(6 citation statements)

References 30 publications

(28 reference statements)

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“…The gray patches in the FRF plot are used to identify the one-third octave frequency band around which the highest vibration amplitudes are occurring. For the damping plate concept, attaching the multi-unit damping plate to the outer wall of the stator ring shows significantly higher vibration attenuation in comparison to the other configurations [1]. Hence, for comparison purposes, this multi-unit configuration has been plotted in Figure 6.…”

Section: Resultsmentioning

confidence: 99%

“…Altogether nine different configurations have been experimentally investigated, which also include single-unit and multi-unit damping plate arrangements. The detailed design of the damping plate can be seen in our previous work [1]. Furthermore, in the existing cavity concept, the hollow structure of the stator arm is utilized to place the granular materials, see Figure 3 (right).…”

Section: Stator Armmentioning

confidence: 99%

“…The test specimen has been designed by taking a small section of the original wind turbine stator and scale it down, see Figure 2. The geometrical parameters of the WTS specimen are taken from a previous study [1]. It is made up of steel as it is in the case of real wind turbine stator.…”

Section: Test Specimen Design and Conceptsmentioning

confidence: 99%

“…To reduce the vibration amplitude of the generator, two different concepts have been developed, namely: the damping plate concept [1] and the existing cavity concept. In the damping plate concept, the honeycomb cells of the damping plate are partially filled with granular materials.…”

Section: Stator Armmentioning

confidence: 99%

“…The energy dissipation rate of a particle damper is a highly non-linear phenomenon and depends on several factors. In previous studies, the dependency of particle dampers on several parameters, like particle shape and size, filling ratios, the number of particles, and particle materials has been investigated [1][2][3][4]. Out of all these parameters, the choice of filling material is one of the essential and major factors on which the damping performance of particle dampers depends.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Application and damping mechanism of particle dampers

Prasad

Duvigneau

Woschke

et al. 2023

Proc Appl Math and Mech

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A particle damper is a passive damping technique, which is based on the high damping properties of granular materials. The energy dissipation rate of a particle damper depends on several factors, like the type of granular materials, filling ratios, particle size, and shape, etc. Out of all these factors, the type of granular materials used to design a particle damper plays a major role. Therefore, this contribution aims to investigate the influence of eleven different granular materials on vibration attenuation. Furthermore, the application of particle dampers for reducing the low‐frequency vibration amplitude of a wind turbine generator has been demonstrated. For this, two different approaches, namely the damping plate concept and the existing cavity concept have been introduced. It has been found that both concepts are capable of reducing the vibration amplitude tremendously. The material investigation has shown that rubber granulate can reduce the vibration amplitude of the test specimen significantly higher in comparison to the other materials by increasing the additional mass to the entire system marginally. The material test is independent of any particular application. Hence, the results can be used to reduce the vibration amplitude of any mechanical structure.

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Section: Resultsmentioning

confidence: 99%

Section: Stator Armmentioning

confidence: 99%

Section: Test Specimen Design and Conceptsmentioning

confidence: 99%

Section: Stator Armmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Application and damping mechanism of particle dampers

Prasad

Duvigneau

Woschke

et al. 2023

Proc Appl Math and Mech

Self Cite

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Sound Characteristics and Mechanical Properties of Metal Powder Chamber Structures Composite Materials Formed by Laser Powder Bed Fusion

Li,

Guo,

Jiang

et al. 2024

Adv Eng Mater

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Granular damping technology is a widely used method in aerospace and other industries to reduce vibration and noise. However, the technique still faces challenges such as secondary processing, additional structure, single structure, and residual stress. This article introduces a new composite material, the Metal Powder Chamber Structure (MPCS), formed through the laser powder bed fusion (LPBF) technology. The article explores the effects of factors like arrangement mode, volume fraction, and powder chamber diameter on the sound and mechanical properties of MPCS. The study shows that MPCS improves the sound insulation effect of the material and defies the mass law of sound insulation. The sample 4B40 using a body‐centered cubic arrangement has a sound insulation coefficient of 52dB. The sound absorption efficiency curve presents a double peak, and the sample 6F60 exhibits the highest sound absorption efficiency of 0.76. MPCS changes the deformation stage of the material stress‐strain curve, and different MPCS also alters the compression deformation mode of the composite material. By studying the effects of MPCS on sound and mechanical properties, we hope to provide a better and more sustainable solution for vibration and noise reduction.This article is protected by copyright. All rights reserved.

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Design Strategies of Particle Dampers for Large-Scale Applications

Prasad,

Duvigneau,

Reinboth

et al. 2023

J. Vib. Eng. Technol.

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Purpose Particle dampers are dynamic vibration absorbers that can be attached or inserted into a vibrating structure for broadband vibration attenuation. The particle damping technique is widely used across various industries for vibration attenuation because of its conceptual simplicity, cost-effectiveness, and suitability for harsh environments (Gagnon et al. in J Sound Vib, 2019. https://doi.org/10.1016/j.jsv.2019.114865; Lu et al. in Struct Control Health Monit, 2018. https://doi.org/10.1002/stc.2058). However, designing a particle damper for real-world applications is significantly challenging primarily due to the interaction among the numerous parameters that influence the damping effectiveness of a particle damper. Therefore, this contribution aims to experimentally investigate the particle dampers performance in the context of their designs. Methods We introduce three different design variants, namely thin-walled cavity (TWC), thin-walled cavity with additional sheets (TWC-AS), and ring cavity (RC). Different strategies are detailed and evaluated in the current paper. Following the comprehensive study of various design variants at the laboratory scale, several tests were conducted on a real-scale wind turbine generator, subjected to real-world loading conditions. Additionally, the effect of particle damper size and its location for the structure on vibration attenuation has been studied. Results Based on the experimental investigation, all these variants are effective in reducing the vibration amplitude of a structure. Furthermore, it has been found that for practical applications, particularly in the case of large-scale mechanical structures such as wind turbines, it is advisable to combine the most successful variants to design a particle damper. This approach can achieve significant vibration attenuation, and also minimize the additional mass of the granular material compared to a conventional particle damper. Conclusion The findings from our experimental studies offer valuable insight into the design of particle dampers for large-scale hollow mechanical structures.

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Application of Particle Dampers on a Scaled Wind Turbine Generator to Improve Low-Frequency Vibro-Acoustic Behavior

Cited by 9 publications

References 30 publications

Application and damping mechanism of particle dampers

Application and damping mechanism of particle dampers

Sound Characteristics and Mechanical Properties of Metal Powder Chamber Structures Composite Materials Formed by Laser Powder Bed Fusion

Design Strategies of Particle Dampers for Large-Scale Applications

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