Amit Dolev

GENERALRESEARCHPUBLICATIONS
Amit Dolev profile picture


PhD direct track 2014 –
Advisor: Prof. Izhak Bucher


Contact Details

Full CV – LINK

Office: Lady Davis Building 365

Tel: +972-77-8873605

Email: amitdtechnion@gmail.com

Research interests
  • Structural vibrations
  • Modal analysis
  • Nonlinear dynamics
  • Acoustics

Current research

Parametrically excited mechanisms for selective detection in distributed systems and alternating the radiated acoustic spectrum.

Pictures  Videos

Pictures

Single_Disc_BC_v

The actuators velocity distribution, oscillating at a certain natural frequency.

Single_Disc_SPL

The resulting sound pressure level due to the actuators velocity profile

 

 

Single degree of freedom tuneable, nonlinear, dual frequency parametrically excited amplifier - model and experimental rig.

Single degree of freedom tuneable, nonlinear, dual frequency parametrically excited amplifier – model and experimental rig.

Single degree of freedon system Response

The SDOF amplifier response vs. the pumping frequency is comprised of many frequencies, and the amplitudes’ dominant harmonics are provided below. The dominant frequencies are the natural frequency  and the external force frequency . In the figure, one can see the resemblance between the analytic solution (blue), numerical simulation (orange) and experimental results (yellow).

Multi degree of freedom system

Three degree of freedom tuneable, nonlinear, dual frequency parametrically excited amplifier – model and experimental rig.

Multi degrees of freedom system response

The MDOF amplifier response vs. the pumping frequency is comprised of many frequencies, and the amplitudes’ dominant harmonics are provided below. The dominant frequencies are the external force frequency and the natural frequency  to which the amplifier was tuned. In the figure, one can see the resemblance between the analytic solution (continuous line), numerical simulation (circular data markers) and experimental results (hollow diamond shaped data markers). The solution in the figure is illustrated by the amplitudes on the mass normalized modes, the first mode is shown by blue and purple curves, the second mode by orange and light green curves and the third mode by yellow and light blue.

Videos

Far-field Acoustic Levitation

Operating mode shape of the actuator.

Actuator induced field pressure.

Parametric amplification

The MDOF amplifier response to external excitation without parametric excitation and with parametric excitation tuned to the second mode (00:7).

The MDOF amplifier response to external excitation without parametric excitation and with parametric excitation tuned to the third mode (00:11).

The realization of a link (spring and dashpot) (00:11) between the first and third masses.

PUBLICATIONS

  • Bucher, I., Gabai, R., Plat, H., Dolev, A., and Setter, E., “Experimental travelling waves identification in mechanical structures,” Mathematics and Mechanics of Solids. (2017): 1081286517732825. doi: 10.1177/1081286517732825.
  • Dolev, A., and Bucher, I,. “Experimental and Numerical Validation of Digital, Electromechanical, Parametrically Excited Amplifiers.”Journal of Vibration and Acoustics 138, no. 6 (2016): 061001. doi:10.1115/1.4033897
  • Dolev, A., and Bucher, I,. “Tuneable, non-degenerated, nonlinear, parametrically-excited amplifier.”Journal of Sound and Vibration 361 (2016): 176-189. doi:10.1016/j.jsv.2015.09.048

Journals Papers in Press

  • Tresser, S., Dolev, A., and Bucher, I., “Dynamic balancing of super-critical rotating structures using low-speed data via parametric excitation,” To be published in: Journal of Sound and Vibration.

Journals Papers in Review

  • Dolev, A., and Bucher I., “Dual frequency parametric excitation of a nonlinear multi degree of freedom amplifier with a digitally modified topology,” Submitted to: Journal of Sound and Vibration

Journals Papers in Preparation

  • Dolev, A., and Bucher I., “Optimizing the dynamical behavior of a dual frequency parametric amplifier with quadratic and cubic nonlinearities,”
  • Dolev, A., Tresser, S., and Bucher I., “Balancing rotating structures using slow-speed data via parametric excitation and nonlinear feedback theory and experiment,”

PATENTS

  • Bucher, I., and Dolev, A., “Method and system for parametric amplification,” Unites States, Patent, No. US 20170040913 A1.”

CONFERENCES

Refereed papers in conference proceeding

  • Dolev, A., and Bucher, I., “In situ topology modification for increased sensitivity in a multi-degree-of-freedom parametric amplifier,” ICCES 2017 – International Conference on Computational & Experimental Engineering and Science, Funchal, Madeira Island, Portugal, June 26-30, 2017.
  • Bucher, I., Tresser, S., and Dolev, A., “Detecting imbalance of high-speed rotors with dual frequency parametric excitation,” ICCES 2017 – International Conference on Computational & Experimental Engineering and Science, Funchal, Madeira Island, Portugal, June 26-30, 2017.
  • Dolev, A., and Bucher, I., “Analytical, numerical and experimental investigation of a tunable, nonlinear multi-degree-of-freedom parametrically excited amplifier, ISMA 2016 – International Conference on Noise and Vibration Engineering, Leuven, Belgium, September 19-21, 2016.
  • Dolev, A., and Bucher, I., “A parametric amplifier for weak, low-frequency forces”, IDETC/CIE 2015 – Proceeding of the ASME 2015 international design engineering technical conferences and computers & information in engineering conference, Boston, Massachusetts, USA, August 2-5, 2015. doi:10.1115/DETC2015-46273
  • Dolev, A., and Bucher, I., “A new paradigm for parametric mechanical amplifier”, DINAME 2015 – Proceedings of the XVII International Symposium on Dynamic Problems of Mechanics, Natal, RN, Brazil, February 22-27, 2015.

Other conference contributions

  • Dolev, A., and Bucher, I., “Dual frequency parametric excitation of a nonlinear multi degree-of-freedom amplifier”, the 1 MOST Conference, Tel-Aviv, Israel, June 18, 2017.
  • Tresser, S., Dolev, A., and Bucher, I., “Balancing high speed flexible rotors using low rotation speed via parametric excitation”, the 34 ICME, Haifa, Israel, November 22-23, 2016.
  • Dolev, A., and Bucher, I., “Tunable parametrically excited amplifier for selective detection in distributed systems”, the 33 ICME, Tel-Aviv, Israel, March 2, 2015.
  • Dolev, A., and Bucher, I., “Balancing a fast rotating system while spinning at low rotation speeds”, Predictive maintenance, harshness monitoring, society meeting, Haifa, Israel, January 8, 2015.