Education

  • Ph.D., Engineering Mechanics, Virginia Tech, 2009
  • M.S.M.E., METU, Ankara, Turkey, 2006
  • B.S.M.E., METU, Ankara, Turkey, 2004

Research Areas and Descriptors

  • Acoustics and Dynamics and Mechanics of Materials: Structural dynamics; linear and nonlinear vibrations; energy harvesting from dynamical systems; smart structures; bio-inspired locomotion, sensing and actuation; theoretical and experimental modal analysis; structural coupling and modification techniques.

Background

Dr. Erturk began at Georgia Tech in May 2011 as an Assistant Professor. Prior, he worked as a Research Scientist in the Center for Intelligent Material Systems and Structures at Virginia Tech (2009-2011). His postdoctoral research interests included theory and experiments of smart structures for applications ranging from aeroelastic energy harvesting to nonlinear vibrations of electroelastic systems.

His Ph.D. dissertation (2009) was centered on experimentally validated electromechanical modeling of piezoelectric energy harvesters using analytical and approximate analytical techniques. Prior to his Ph.D. studies in Engineering Mechanics at Virginia Tech, Dr. Erturk completed his M.S. degree (2006) in Mechanical Engineering at METU with a thesis on analytical and semi-analytical modeling of spindle - tool holder - tool dynamics in machining centers for predicting chatter stability and identifying interface dynamics between the assembly components.

Research

Dr. Erturk’s theoretical and experimental research interests are centered on the intersection of smart structures and dynamical systems with applications to novel multiphysics problems.

One of Dr. Erturk’s primary research interests is exploiting nonlinear dynamic phenomena in emerging fields. For instance, his group employs bistable and monostable nonlinear electromechanical structures (e.g. beams and plates with piezoelectric laminates) for frequency bandwidth enhancement and also to exploit secondary resonances as well as modal interactions in vibration energy harvesting (figure a). The goal in the field of vibration-based energy harvesting is to convert ambient vibration into electricity for enabling self-powered electronic components such as wireless sensor networks used in monitoring applications. Nonlinear energy harvesters developed in Dr. Erturk’s lab offer orders of magnitude larger frequency bandwidth as compared to their linear counterparts, yielding efficient energy conversion over a wide range of excitation frequencies. In this context the focus is placed not only on the prototype design, development, and fabrication, but also on understanding complex dynamic interactions of intentionally designed and inherently present nonlinearities, as well as intrinsic and extrinsic nonlinear dissipative effects through rigorous experiments and high-fidelity modeling.

Broadband vibration attenuation (figure b) is of interest for a wide range of engineering applications, spanning from industrial machines to aerospace and civil engineering structures. Dr. Erturk’s group explores broadband vibration damping using metamaterials with locally resonating components. For an effective use of metamaterial concepts in low-frequency dynamics of finite structures, research is needed to bridge the gap between the dispersion characteristics and modal behavior of the finite host structure with its resonator attachments.Both linear and nonlinear structures are investigated for amplitude dependent damping applications. Other than purely mechanical vibration absorber design architectures, piezoelectric shunt damping with nonlinear switching circuits is applied to flexible nonlinear structures for bifurcation suppression and vibration attenuation (figure b).   

Bio-inspired aquatic and aerial structures with smart materials are also investigated as scalable and effective research platforms to explore other multiphysics problems, such as aquatic locomotion (figure c). A novel untethered piezoelectric robotic fish platform was developed and tested in Dr. Erturk’s lab and proven to outperform its smart material-based swimmer counterparts, offering a geometrically scalable alternative to motor-based robotic fish without compromising the swimming speed. The fundamental research problem in underwater nonlinear actuation is to understand the dynamics of fluid-loaded fiber-based flexible piezoelectric structures for broad range of actuation levels. Combination of elastic, coupling, electric field, and dissipative nonlinear effects in piezoelectric actuation with geometric nonlinearities and aspect ratio-dependent fluid loading effects constitutes the main challenge in this research topic. Fluid-loaded piezoelectric structures are of interest also for contactless acoustic power transfer research in Dr. Erturk’s lab. As compared to well-explored inductive coupling, acoustic power transfer offers several advantages such as long transmission distances and elimination of magnetic fields. Acoustic-structure interaction modeling of contactless power transfer for bridging the transmitter and receiver electroelastic dynamics through the propagation medium as well as performance enhancement are of interest in this research (figure c).

Wave propagation in adaptive structures is another intriguing research topic especially for energy harvesting (figure d). In many cases structural energy is in the form propagating waves rather than standing waves. Collaborative research efforts led by Dr. Erturk explore elastic mirror and lens concepts for wave focusing and thereby enhanced structure-borne wave energy harvesting. Beyond the energy harvesting concepts, adaptive electroelastic components inserted to waveguides are also investigated for establishing tunable and selective narrowband-broadband reflection and transmission characteristics toward enabling next-generation multifunctional wave devices.

Some of Dr. Erturk’s research topics involve active collaborations with colleagues from different engineering disciplines. His research has been funded by various agencies including the National Science Foundation, the National Institute of Standards and Technology, and the Air Force Office of Scientific Research.

The interdisciplinary research topics mentioned here utilize both theoretical and experimental techniques. Therefore the students involved develop advanced modeling skills along with an appreciation of experimental challenges. Conducting research in the foregoing topics provide the students with a bridge between the concepts of structural dynamics and smart materials as well as theoretical and experimental modal analysis with applications to novel multiphysics problems. The students are also offered the opportunities to interact and collaborate with other research groups, develop strong technical communication and presentation skills, and regularly participate in technical conferences.

Distinctions

  • ASME Gary Anderson Early Achievement Award, 2015
  • Thank a Teacher Certificates, 2013-2014
  • NSF CAREER Award, 2013
  • Sigma Xi Georgia Tech Chapter, Best MS Thesis Award (for S. Zhao), Advisor, 2013
  • CETL Class of 1969 Teaching Fellow, 2012-2013
  • Best Student Paper Award (for S. Zhao), ASME Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Advisor, 2012
  • Smart Materials and Structures, Associate Editor, 2013-present
  • Journal of Intelligent Material Systems and Structures, Guest Editor, 2011-2012, Associate Editor, 2012-present
  • ASME Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS), Symposium Chair, 2012
  • ASME International Design Engineering Technical Conferences (IDETC), Symposium Co-chair, 2012-present
  • ASME Energy Harvesting Technical Committee, Founding Chair, 2012-2014
  • ASME Design Engineering Division, Technical Committee on Vibration and Sound, Elected Member, 2011-2014
  • ASME Aerospace Division, Adaptive Structures and Material Systems Branch, Elected Member, 2011-present
  • Most cited articles in Smart Materials and Structures, Journal of Intelligent Material Systems and Structures, Journal of Vibration and Acoustics, 2009-2010
  • Featured and most downloaded article in Applied Physics Letters, July 2009
  • ASME SMASIS Best Student Paper Awards, coauthor, 2009 and 2010
  • Virginia Polytechnic Institute and State University, Liviu Librescu Memorial Scholarship, 2008
  • The Parlar Foundation, Middle East Technical University, Thesis of the Year Award, 2006

Representative Publications

Cen, L. and Erturk, A., 2013, Bio-Inspired Aquatic Robotics by Untethered Piezohydroelastic Actuation,Bioinspiration and Biomimetics, 8, 016006.

Zhao, S. and Erturk, A., 2013, On the Stochastic Excitation of Monostable and Bistable Electroelastic Power Generators: Relative Advantages and Tradeoffs in a Physical System, Applied Physics Letters, 102, 103902.

Dias, J.A.C., De Marqui, Jr., C., and Erturk, A., 2013, Hybrid Piezoelectric-Inductive Flow Energy Harvesting and Dimensionless Electroaeroelastic Analysis for Scaling, Applied Physics Letters, 102, 044101.

Elvin, N. and Erturk, A., 2013, Advances in Energy Harvesting Methods, Springer, New York.

Zhao, S. and Erturk, A., 2013, Electroelastic Modeling and Experimental Validations of Piezoelectric Energy Harvesting from Broadband Random Vibrations of Cantilevered Bimorphs, Smart Materials and Structures, 22, 015002.

Carrara, M., Cacan, M., Leamy, M.J., Ruzzene, M., and Erturk, A., 2012, Dramatic Enhancement of Structure-borne Wave Energy Harvesting Using an Elliptical Acoustic Mirror, Applied Physics Letters, 100, 204105.

Stanton, S.C., Erturk, A., Mann, B.P., Dowell, E.H., and Inman, D.J., 2012, Nonlinear Nonconservative Behavior and Modeling of Piezoelectric Energy Harvesters Including Proof Mass Effects, Journal of Intelligent Material Systems and Structures, 23, pp. 183-199.

Erturk, A., 2012, Assumed-modes Modeling of Piezoelectric Energy Harvesters: Euler-Bernoulli, Rayleigh, and Timoshenko Models with Axial Deformations, Computers and Structures, 106, pp. 214-227.

Anton, S.R., Erturk, A., and Inman, D.J., 2012, Multifunctional Unmanned Aerial Vehicle Wing Spar for Low-Power Generation and Storage, AIAA Journal of Aircraft, 49, pp. 292-301. 

Erturk, A. and Inman, D.J., 2011, Piezoelectric Energy Harvesting, Wiley, Chichester, UK.

Erturk, A. and Delporte, G., 2011, Underwater Thrust and Power Generation Using Flexible Piezoelectric Composites: An Experimental Investigation Toward Self-Powered Swimmer-Sensor Platforms, Smart Materials and Structures, 20, 125013.

Erturk, A. and Inman, D.J., 2011, Broadband Piezoelectric Power Generation on High-Energy Orbits of the Bistable Duffing Oscillator with Electromechanical Coupling, Journal of Sound and Vibration, 330, pp. 2339-2353.

Arrieta, A.F., Hagedorn, P., Erturk, A., and Inman, D.J., 2010, A Piezoelectric Bistable Plate for Nonlinear Broadband Energy Harvesting, Applied Physics Letters, 97, 104102.

Erturk, A., Vieira, W.G.R., De Marqui, Jr., C., and Inman, D.J., 2010, On the Energy Harvesting Potential of Piezoaeroelastic Systems, Applied Physics Letters, 96, 184103.

Stanton, S.C., Erturk, A., Mann, B.P., and Inman, D.J., 2010, Nonlinear Piezoelectricity in Electroelastic Energy Harvesters: Modeling and Experimental Identification, Journal of Applied Physics, 108, 074903.

Erturk, A., Hoffmann, J., and Inman, D.J., 2009, A Piezomagnetoelastic Structure for Broadband Vibration Energy Harvesting, Applied Physics Letters, 94, 254102.

Erturk, A. and Inman, D.J., 2009, An Experimentally Validated Bimorph Cantilever Model for Piezoelectric Energy Harvesting from Base Excitations, Smart Materials and Structures, 18, 025009.

Erturk, A., Ozguven, H.N., and Budak, E., 2006, Analytical Modeling of Spindle-Tool Dynamics on Machine Tools using Timoshenko Beam Model and Receptance Coupling for the Prediction of Tool Point FRF, International Journal of Machine Tools and Manufacture, 46, pp. 1901-1912.