Researcher:
Külah, Serkan

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Master Student

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Serkan

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Külah

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Külah, Serkan

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2011 - 20144

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    Analog velocity feedback controller for vibration suppression and sound attenuation
    (American Society of Mechanical Engineers, 2011) Department of Mechanical Engineering; Başdoğan, İpek; Arıdoğan, Mustafa Uğur; Boz, Utku; Külah, Serkan; Faculty Member; PhD Student; PhD Student; Master Student; Department of Mechanical Engineering; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 179940; N/A; N/A; N/A
    In this paper, an analog velocity feedback controller is considered for active vibration suppression of a thin plate for attenuation of sound levels in the frequency range of 0-100 Hz. The active control methods can be applied to interior cavity noise reduction, as encountered for instance in automotive applications. For that purpose, a simplified experimental vibro-acoustic cabin model was built in our laboratory and developed methodologies are demonstrated on the set-up. The set-up includes a rectangular box (1 × 1 × 2 m) which is separated with a flexible thin plate (1 × 1 × 0.001 m) to obtain two enclosed cavities: the passenger compartment (PC) and the engine compartment (EC). The vibration control is applied only on the flexible plate since the walls enclosing the cavities are made of more rigid material (wood filled concrete). By employing piezoelectric patch as actuator and laser doppler vibrometer as vibration sensor, an analog proportional velocity feedback controller is designed and built experimentally for suppressing the low-frequency modes of the flexible plate. In order to attenuate only lower-frequency structural modes of the thin panel, pre-filters are also included in analog circuit. The vibration of thin plate and sound in the passenger compartment is measured for controller-inactive and active cases while disturbing the thin plate via shaker. By measuring vibration and sound response, closed and open loop experimental frequency responses are obtained and presented. The aim of this experimental study is to investigate performance of active vibration control applications on acoustic attenuation as the first step towards robust structural acoustic control. © 2011 by ASME.
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    Investigation of an active structural acoustic control system on a complex 3D structure
    (The Society for Experimental Mechanics, 2014) N/A; N/A; N/A; Department of Mechanical Engineering; Külah, Serkan; Arıdoğan, Mustafa Uğur; Başdoğan, İpek; Master Student; PhD Student; Faculty Member; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 179940
    Interior noise inside the passenger cabin of ground vehicles can be classified as structure-borne and airborne. The disturbance caused by the engine forces excites the panels enclosing the passenger cabin to vibrate at their resonance frequencies. These vibrating panels cause changes in the sound pressure levels within the passenger cabin, and consequently generating an undesirable booming noise. In this study, we developed a methodology to design an active structural acoustic controller (ASAC) to attenuate the structure-borne noise, which is mainly caused by the most influential radiating panel. The panel is determined by conducting panel acoustic contribution analysis (PACA) based on the acoustic transfer vector (ATV) methodology. Then, active structural acoustic controller is designed for vibration suppression of this panel, which has complex geometry and boundary conditions. The performance of the controller for noise reduction is investigated for various controller parameters and sensor/actuator positions. It is shown that an optimization algorithm is required to determine the optimum controller parameters and sensor/actuator positions to reduce sound pressure levels inside the cabin efficiently.
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    Application of proportional velocity feedback control to attenuate the vibrations of a flexible plate using piezoceramic patch actuators
    (Springer-Verlag Berlin, 2011) N/A; N/A; N/A; Department of Mechanical Engineering; Külah, Serkan; Boz, Utku; Başdoğan, İpek; Master Student; PhD Student; Faculty Member; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 179940
    This paper presents a theoretical and experimental study on the control performance of proportional velocity feedback control with rectangular piezoceramic patch actuators to attenuate the vibrations of a thin flexible plate. For this purpose, first, frequency response funciton of the plate is obtained based on the experimental frequency sweep data. Then, a state space model was fitted to the measured frequency response to be used in the simulations to represent the plant dynamics. The controlled response of the plate is investigated via simulations using MATLAB/SIMULINK. Control performance of the controller is investigated and discussed for various feedback gains.
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    Active control of plate-like structures for vibration and sound suppression
    (intech Europe, 2012) Department of Mechanical Engineering; Başdoğan, İpek; Boz, Utku; Külah, Serkan; Arıdoğan, Mustafa Uğur; Faculty Member; PhD Student; Master Student; PhD Student; Department of Mechanical Engineering; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 179940; N/A; N/A; N/A