Active and passive structural acoustic control of the smart beam

Filipek, R.; Wiciak, Jerzy

doi:10.1140/epjst/e2008-00517-2

Cited by 14 publications

(14 citation statements)

References 7 publications

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“…Both a-and p-reduction are realized with actuators. Instead of the active vibration reduction, there is the passive one [4,5]. The quantity of the reduction depends on many factors.…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness Analysis of the Beam Modes Active Vibration Protection with Different Number of Actuators

Brański

2013

Acta Phys. Pol. A

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This paper deals with an active vibration protection (p-reduction) of the beam-actuators mechanical system, hence it concerns separate modes. The paper's aim is an eectiveness analysis of the p-reduction assuming dierent number of actuators. It is assumed a priori that actuators are bonded to the beam in the sub-domain with the largest curvatures and they are exactly the same. The beam clamped at one end is chosen as the research object. Next, as required by the p-reduction condition, the number and distribution of actuators are changed. It turns out that the best reduction eectiveness, measured via any eectiveness coecient, is obtained for one actuator bonded in the sub-domain with the largest curvature. The validation of theoretical considerations is conrmed numerically.

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“…Both a-and p-reduction are realized with actuators. Instead of the active vibration reduction, there is the passive one [4,5]. The quantity of the reduction depends on many factors.…”

Section: Introductionmentioning

confidence: 99%

“…It turned out that the values of forces were minimal, so this means that the minimum energy is added to the system and consequently, the maximum eectiveness of the p-reduction is assured. An eectiveness measure of the reduction is an eectiveness coecient dened in [1,2,4,7,915].…”

Section: Introductionmentioning

confidence: 99%

Effectiveness Analysis of the Beam Modes Active Vibration Protection with Different Number of Actuators

Brański

2013

Acta Phys. Pol. A

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“…Building a reliable model of the room with the "balloon" located inside requires the use of FEM. This is related to taking into account the coupling between the sound pressure changes in two centers with different physical parameters and vibration of the balloon's shell (Filipek, 2008). Additional computational complexity is introduced by necessity to take into account the initial stresses in the shell of the balloon.…”

Section: The Effect Of the Aerostat On The Acoustic Measurement Resultsmentioning

confidence: 99%

Automated Measurement System for Room Acoustics – an Initial Feasibility Study

Borkowski¹,

Pluta²

2015

Archives of Acoustics

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Currently used procedures in room acoustics measurements are not automated. Particularly in mediumsized and large areas they require a lot of time and intensive labour which directly translates into an increase in the measurement cost. Introduction of an automated system would increase efficiency of the measurements, and therefore could present both practical and scientific benefit. The paper presents initial feasibility study for designing a system that permits the measurement of selected acoustic parameters for any choice of three-dimensional grid of measurement points throughout the volume of the room. The system will utilize an autonomous probe attached to a blimp, and will be able to measure and analyze acoustic characteristics of the rooms. The article discusses the initial choices of the system elements, starting from the general idea, through the mechanical design and control procedures, the software that controls positioning and flying of the probe, up to the automation of the measurement procedure and its possible impact on the acoustic field.

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“…In addition, the acoustic elements in contact with the walls of the structure use node displacement as degrees of freedom as well. The external surface of the acoustic volume contained Fluid130 elements that took into account the condition of complete emission of sound from the system, which is the Sommerfeld radiation condition (Filipek, Wiciak, 2008;Gołaś, Filipek, 2009). It is implemented in semi-infinite elements and prescribes the asymptotic behaviour of the solution of wave equation in this exterior boundary value problem.…”

Section: Computation Of the Acoustic Responsementioning

confidence: 99%

Digital Synthesis of Sound Generated by Tibetan Bowls and Bells

Gołaś¹,

Filipek²

2016

Archives of Acoustics

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The aim of this paper is to present methods of digitally synthesising the sound generated by vibroacoustic systems with distributed parameters. A general algorithm was developed to synthesise the sounds of selected musical instruments with an axisymmetrical shape and impact excitation, i.e., Tibetan bowls and bells. A coupled mechanical-acoustic field described by partial differential equations was discretized by using the Finite Element Method (FEM) implemented in the ANSYS package. The presented synthesis method is original due to the fact that the determination of the system response in the time domain to the pulse (impact) excitation is based on the numerical calculation of the convolution of the forcing function and impulse response of the system. This was calculated as an inverse Fourier transform of the system's spectral transfer function. The synthesiser allows for obtaining a sound signal with the assumed, expected parameters by tuning the resonance frequencies which exist in the spectrum of the generated sound. This is accomplished, basing on the Design of Experiment (DOE) theory, by creating a meta-model which contains information on its response surfaces regarding the influence of the design parameters. The synthesis resulted in a sound pressure signal in selected points in space surrounding the instrument which is consistent with the signal generated by the actual instruments, and the results obtained can improve them.

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Active and passive structural acoustic control of the smart beam

Cited by 14 publications

References 7 publications

Effectiveness Analysis of the Beam Modes Active Vibration Protection with Different Number of Actuators

Effectiveness Analysis of the Beam Modes Active Vibration Protection with Different Number of Actuators

Automated Measurement System for Room Acoustics – an Initial Feasibility Study

Digital Synthesis of Sound Generated by Tibetan Bowls and Bells

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