Analysis of flat plate vibrations by varying frontal area to the flow

Vutukuru, Shravan Koundinya; Vība, Jānis; Tipāns, Igors; Viksne, Ilmars; Irbe, Martins

doi:10.22616/erdev2019.18.n147

Cited by 8 publications

(11 citation statements)

References 2 publications

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“…The validation of the proposed theory [1][2] using the concept of zones through a simple pendulum setup was taken up in an air flow. The simple pendulum setup could be the best experimental device for quick validation of fluid structure interaction phenomenon as a similar type of validation with air, as fluid medium was performed for aero-elastic structures and NACA aero foils [8][9].…”

Section: Resultsmentioning

confidence: 99%

“…Fluid-rigid body interaction phenomenon is studied to a great extent in the works [1][2], where an approximate analytical method by making use of the concept of zones is proposed. It is realized from the concept of zones that the space around the fluid rigid body interaction can be split into a pressure zone and a suction zone (or vacuum zone, where the pressure is constant along the length of the body).…”

Section: Introductionmentioning

confidence: 99%

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Action of pendulum in transient fluid flow

Tipāns

Vība

Vutukuru

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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The work is dedicated to the authors' latest research on the interaction of moving inflexible objects when subjected to non-constant velocity fluid flow (air, water) without the use of work-intensive space-time programming methods. In the first part of the study, the differential equation of the plane pendulum motion is derived using the novel approach of fluid-rigid body interaction phenomenon, in this equation, the moment caused by the fluid interaction is simplified by ignoring the flow viscosity. This makes it possible to obtain the usual second-order differential equation of pendulum motion, which contains components of relative velocity in a simplified way, instead of the partial differential equations in a continuous mathematical space. The application of the obtained equation is further used in solving specific tasks of engineering importance. The first task analyzes the pendulum swing motion in a still airflow. Here, the equation described above is numerically integrated and the results are compared with an experiment in a natural environment. The comparison resulted in a drag interaction factor that was further used in other more complex cases. The second task analyzes the pendulum motion when fluid flow velocities are a decreasing function of time in a harmonic behavior. In addition, in this case, the possibilities of applying the developed theory to other forms of flow rate change, such as pulse or poly harmonic forms, are considered. In the third task, the synthesis of motion control in a mechatronic system was performed. In this case, the possibility of regulating the additional resistance torque arising from the rotary damping generator is considered. The work is illustrated with graphical results. The outcomes obtained in the work can be used in the analysis of the interaction of existing moving objects with the fluid flow, as well as in the synthesis of new technological processes, for example, for obtaining energy from vibrating objects immersed in fluid flow.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Action of pendulum in transient fluid flow

Tipāns

Vība

Vutukuru

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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“…where ,drag force and lift force, N; fluid density, 1.25 kg•m -3 ; ,drag coefficient, lift coefficient, depend on the shape of the object, unitless, previously obtained using simulation in paper [11];…”

Section: Methodsmentioning

confidence: 97%

Translational vibrations of flat plate with elastic suspension in air flow

Cerpinska

Panovko

Vutukuru

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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The goal of the study was exploring the possibility of energy harvesting from the vibration of the body in the air focusing on the example of the flat plate. Theory suggests that at certain conditions and excitation parameters vibrations of the system increase so that energy can be produced. Additional energy can be extracted from flutter motionan aeroelastic instability that results in self-excited oscillation. The flutter is usually considered as the negative side effect that engineers try to eliminate, but in this study, we look for ways how to benefit from it. The flat plate is fixed in a flexible suspension and is affected by the air flow. The suspension is designed in such a way that the plate does not rotate but moves in a translational motion. First, the air flow was set up in different ways to study the response of the plate. Using computer modelling in MathCAD software, the movement of the object in the air flow was analysed. Some areas of the system at specific excitation conditions produced stable "flutter" type oscillations. Normally, the damping should be negative to describe self-excited vibrations. However, modelling proved that at specific lift and drag values the amplitude of the vibration grows even if there is no damping component in the equation at all. Graphs with changes in the center coordinate and velocity components of the 2DOF plate were composed to illustrate the solution.

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“…To determine coefficient C, numerical simulations in Solid Works for flat plate interaction with air flow were performed [8,9]. Modeling results for a rectangular flat plate were compared with analytical formula (6).…”

Section: Theory and Simulation Of Plane Motion Of Flat Platementioning

confidence: 99%

Synthesis and Optimization of Wind Energy Conversion Devices

Vība¹,

Beresnevich²,

Irbe³

2020

Design Optimization of Wind Energy Conversion Systems With Applications

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An approximate method for the analysis of interaction between wind flow and rigid flat blades is considered. The method allows synthesis and optimization of wind energy conversion systems without using space-time-programming procedures. By this method, the action of wind flow on the blade is subdivided on frontal pressure and vacuum (depression) on leeward side. The method was tested by computer simulation and experiments in wind tunnel. Examples of optimization tasks are solved in application to blades with simple shape. New wind energetic device with controlled orientation of flat blades to air flow is developed. Theoretical and experimental analysis of blade's interaction with airflow is performed. Aerodynamic coefficients for blade's drag and lifting forces are determined experimentally in wind tunnel. Optimization of system parameters is made. To increase the efficiency of energy transformation, it is proposed to change, by special law, the orientation of blade's working surface relative to airflow during rotation of the rotor. It is shown that the optimal angular rotation frequency ratio between rotor and blade is equal to two. Serviceability and main advantages of the proposed method are confirmed by experiments with physical model of airflow device.

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Analysis of flat plate vibrations by varying frontal area to the flow

Cited by 8 publications

References 2 publications

Action of pendulum in transient fluid flow

Action of pendulum in transient fluid flow

Translational vibrations of flat plate with elastic suspension in air flow

Synthesis and Optimization of Wind Energy Conversion Devices

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