Smart structures and their applications on active vibration control: Studies in the Department of Aerospace Engineering, METU

Date

2008-08-01

Author

Şahin, Melin
Yaman, Yavuz
Nalbantoglu, Volkan
Ulker, Fatma Demet
Caliskan, Tarkan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

142
views

0
downloads

This work presents the theoretical and experimental studies conducted in Aerospace Engineering Department of Middle East Technical University on smart structures with particular attention given to the structural modelling characteristics and active suppression of in-vacuo vibrations. The smart structures considered in these analyses are finite and flat aluminium cantilever beam-like (called as smart beam) and plate-like (called as smart fin) structures with surface bonded lead-zirconate-titanate patches. Finite element models of smart beam and smart fin are obtained. Then the experimental studies regarding open loop behaviour of the structures are performed by using strain gauges and laser displacement sensor to determine the system models. Further studies are carried out to obtain H(infinity) and mu-synthesis controllers which are intended to be used in the suppression of free and forced vibrations of the smart structures. It is observed that satisfactory attenuation levels are achieved and robust performance of the systems in the presence of uncertainties is ensured. In that respect a comparative study involving H(infinity) and sliding mode controls is also conducted. Recently, the studies involving aerodynamic loading are also gathering pace.

Subject Keywords

Electrical and Electronic Engineering, Materials Chemistry, Mechanics of Materials, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Ceramics and Composites, Smart structures, Piezoelectricity, Finite element method, Active vibration suppression, Robust performance

URI

https://hdl.handle.net/11511/37931

Journal

JOURNAL OF ELECTROCERAMICS

DOI

https://doi.org/10.1007/s10832-007-9130-6

Collections

Department of Aerospace Engineering, Article

Suggestions

OpenMETU
Core

Piezoelectric ceramics and their applications in smart aerospace structures Çalışkan, Tarkan; Yaman, Yavuz; Nalbantoğlu, Volkan; Department of Aeronautical Engineering (2002) This thesis investigates some applications of smart structures in aerospace engineering. The smart structures considered are finite and flat aluminum beam-like and plate-like structures with surface bonded PZT (Lead-Zirconate-Titanate) patches. The smart structures are studied in cantilevered configuration. The thesis gives the theoretical and experimental studies conducted on the smart structures with particular attention given to the vibration control aspects. In the determination of the structural models...
Theoretical prediction of bulk glass forming ability (BGFA) of Ti-Cu based multicomponent alloys SUER, Sila; Mehrabov, Amdulla; Akdeniz, Mahmut Vedat (Elsevier BV, 2009-03-01) The bulk glass forming ability (BGFA) of Ti-Cu based multicomponent alloys has been evaluated via theoretical modeling and computer simulation studies based on a combination of electronic theory of alloys in the pseudopotential approximation and the statistical thermodynamical theory of liquid alloys The. magnitude of atomic ordering energies, calculated by means of the electronic theory of alloys in the pseudopotential approximation, was subsequently used for calculation of the key thermodynamic parameters...
Investigation of photovoltaic properties of amorphous InSe thin film based Schottky devices Yilmaz, K.; Parlak, Mehmet; Ercelebi, C. (IOP Publishing, 2007-12-01) In this study, device behavior of amorphous InSe thin films was investigated through I-V, C-V and spectral response measurements onto SnO2/p-InSe/metal Schottky diode structures. Various metal contacts such as Ag, Au, Al, In and C were deposited onto amorphous p-InSe films by the thermal evaporation technique. The best rectifying contact was obtained in a SnO2/p-InSe/Ag Schottky structure from I-V measurements, while the Au contact had poor rectification. Other metal contacts (Al, In and C) showed almost oh...
Stability analysis of graphene nanoribbons by molecular dynamics simulations Dugan, N.; Erkoç, Şakir (Wiley, 2008-04-01) In this work, stability of graphene nanoribbons are investigated using molecular dynamics. Simulations include heating armchair and zigzag-edged nanoribbons of widths varying between one and nine hexagonal rings until the bonds between carbon atoms start to break. Breaking temperatures and binding energies per atom for different widths are presented for both armchair and zigzag-edged cases. A nontrivial relation between stability and width is observed and discussed.
Single- and double-helix vortex breakdown as two dominant global modes in turbulent swirling jet flow Vanierschot, Maarten; Mueller, Jens S.; Sieber, Moritz; Perçin, Mustafa; van Oudheusden, Bas W.; Oberleithner, Kilian (Cambridge University Press (CUP), 2020-01-25) In this paper, we study the shape and dynamics of helical coherent structures found in the flow field of an annular swirling jet undergoing vortex breakdown. The flow field is studied by means of time-resolved tomographic particle image velocimetry measurements. The obtained flow fields are analysed using both classic and spectral proper orthogonal decomposition. Despite the simple geometrical set-up of the annular jet, the flow field is very complex. Two distinct large-scale helical flow structures are ide...

Citation Formats

M. Şahin, Y. Yaman, V. Nalbantoglu, F. D. Ulker, and T. Caliskan, “Smart structures and their applications on active vibration control: Studies in the Department of Aerospace Engineering, METU,” JOURNAL OF ELECTROCERAMICS, pp. 167–174, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37931.