Active Control of a Small-Scale Wind Turbine Blade Containing Magnetorheological Fluid

Bolat, Fevzi Çakmak; Sivrioğlu, Selim

doi:10.3390/mi9020080

Cited by 16 publications

(6 citation statements)

References 24 publications

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“…Stainless steel flat workpieces were polished such that the initial surface roughness decreased from Ra 0.47 to Ra 0.34 µm when a magnetic field strength of 0.574 T was applied. Thereafter, the rotational motion of excitation equipment was added into the MRAFF process, and a rotational-magnetorheological abrasive flow finishing (R-MRAFF) process was proposed to improve the polishing quality [21][22][23]. A uniformly smooth mirror was obtained in which helical abrasive particle trajectories were formed by rotation and reciprocating motion.…”

Section: Introductionmentioning

confidence: 99%

Annular Surface Micromachining of Titanium Tubes Using a Magnetorheological Polishing Technique

Song

Peng

et al. 2020

Micromachines

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In this study, a novel magnetorheological (MR) polishing device under a compound magnetic field is designed to achieve microlevel polishing of the titanium tubes. The polishing process is realized by combining the rotation motion of the tube and the reciprocating linear motion of the polishing head. Two types of excitation equipment for generating an appropriate compound magnetic field are outlined. A series of experiments are conducted to systematically investigate the effect of compound magnetic field strength, rotation speed, and type and concentration of abrasive particles on the polishing performance delivered by the designed device. The experiments were carried out through controlling variables. Before and after the experiment, the surface roughness in the polished area of the workpiece is measured, and the influence of the independent variable on the polishing effect is judged by a changing rule of surface roughness so as to obtain a better parameter about compound magnetic field strength, concentration of abrasive particles, etc. It is shown from experimental results that diamond abrasive particles are appropriate for fine finishing the internal surface of the titanium-alloy tube. It is also identified that the polishing performance is excellent at high magnetic field strength, fast rotation speed, and high abrasive-particle concentration.

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Section: Introductionmentioning

confidence: 99%

Annular Surface Micromachining of Titanium Tubes Using a Magnetorheological Polishing Technique

Song

Peng

et al. 2020

Micromachines

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“…In Figure 4, h1 is the wall thickness of the equivalent beam; h2 is the MR fluid layer thickness; b is the width of the beam; and xa and xs are the length from the wall to the actuator and the sensor position, respectively. A dynamic interaction model between the MR fluid and the electromagnetic actuator was constructed to obtain a force relationship, and the H2/H-inf controller was experimentally implemented [23]. Nezami and Gholami studied the optimal locations of a finite number of embedded MR fluid pockets using a single-objective genetic algorithm to suppress the supersonic flutter of an elastically supported sandwich beam with a regular honeycomb interlayer to achieve the optimal compromise between mass and flutter suppression, where the best number of MR pockets and optimal magnetic field values in a honeycomb sandwich structure were determined [24].…”

Section: Mr Sandwich Structurementioning

confidence: 99%

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Sohn

Choi

2022

Actuators

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This review article presents various multi-DOF application systems that utilize smart magnetorheological (MR) fluid. It is well known that MR fluid has been actively studied and applied in many practical systems such as vehicle suspension dampers. The design requirements for the effective applications of MR fluid include geometry optimization, working principles, and control schemes. The geometry optimization is mostly related to the size minimization with high damping force, while the working principles are classified into the shear mode, the flow mode, and the squeeze mode depending on the dominant dynamic motion of the application system. The control schemes are crucial to achieve final targets such as robust vibration control against disturbances. It should be addressed that advanced output performances of MR application systems heavily depends on these three requirements. This review article presents numerous application systems such as sandwich structures, dampers, mounts, brakes, and clutches, which have been developed considering the three design requirements. In addition, in this article some merits and demerits of each application system are discussed to enable potential researchers to develop more effective and practical MR application systems featuring the multi-DOF dynamic motions.

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“…For the turbine blade with a controller on, the gain reduction for 1 st mode was 15.83 dB, and 2 nd mode was 13.07 dB. 31 The introduction of a variable stiffness coupling (VSC) fitted within a shaft for torsional vibration isolation that would adapt and change its attenuation frequency range is presented by Syam et al 32 The VSC concept on torsional vibration isolation is tested experimentally. MRE samples with 40% volume fraction are fabricated and manufactured using a 3D mold design and fixed within a coupling in a shaft to investigate the magnetic field effect on the torsional rigidity.…”

Section: Introductionmentioning

confidence: 99%

Magnetorheological Elastomer based torsional vibration isolator for application in a prototype drilling shaft

Syam

Muthalif

2021

Journal of Low Frequency Noise, Vibration and Active Control

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Smart materials properties are altered using external stimuli such as temperature, pressure and magnetic field. Magnetorheological Elastomer (MRE) is a type of smart composite material consisting of a polymer matrix embedded with ferromagnetic particles. In the presence of an external magnetic field, its mechanical properties, such as stiffness, change due to the interaction between the magnetic particles, which have applications in vibration isolation. Unwanted vibration in machines can cause severe damage and machine breakdown. In this work, a semi-active vibration isolator using MRE is proposed for a potential application in a drilling system to isolate the torsional vibration. The MRE was fabricated with a 35% mass fraction (MF) consisted of silicon rubber and iron particles. It was fitted with aluminium couplers and attached to the shaft (drill string) to study its efficiency in vibration isolation under a magnetic field. Two tests were conducted on the drilling prototype setup used in this work; the first test was a hammer impact test. The torsional transfer function TTF analysis showed that the system’s natural frequency has shifted from 13.9 Hz to 17.5 Hz by the influence of increasing magnetic field around the MRE. The results showed that the continuous rotational vibration amplitude of the prototype is attenuated by more than 40%.

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Active Control of a Small-Scale Wind Turbine Blade Containing Magnetorheological Fluid

Cited by 16 publications

References 24 publications

Annular Surface Micromachining of Titanium Tubes Using a Magnetorheological Polishing Technique

Annular Surface Micromachining of Titanium Tubes Using a Magnetorheological Polishing Technique

Applications of Magnetorheological Fluid Actuator to Multi-DOF Systems: State-of-the-Art from 2015 to 2021

Magnetorheological Elastomer based torsional vibration isolator for application in a prototype drilling shaft

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