Amit Dolev

GENERALRESEARCHPUBLICATIONS
Amit Dolev profile picture


Direct doctoral track track 2014 –
Advisor: Prof. Izhak Bucher


Contact Details

Full CV – Download

Office: Lady Davis Building 365

Tel: +972-77-8873605

Email: amitdtechnion@gmail.com

Research interests
  • Mechanical vibrations and nonlinear dynamics
  • Parametric resonators and amplifiers
  • Acoustics, fluid structure interaction, and standing wave acoustic levitation
  • Experimental identification and modeling of vibrating structures

Current research

  • Parametrically exciting an acoustically levitated sphere in a single-axis ultrasonic levitator.
  • Parametrically excited mechanisms for selective detection in distributed systems and alternating the radiated acoustic spectrum.
Pictures  Videos

Pictures

Standing-wave Acoustic Levitation

A Single-axis ultrasonic levitator and an acoustic field mapping apparatus The pressure field absolute value in different frequencies, acquired by acoustic field mapping apparatus. Section view of the single-axis ultrasonic levitator. The pressure field (right) was numerically computed using boundary elements, and the resulting Gor’kov potential for a small rigid sphere is shown on the left. The sound pressure level generated by the actuator (28.5 kHz). The actuators velocity distribution at about 28.5 kHz.
A Single-axis ultrasonic levitator and an acoustic field mapping apparatus
The pressure field absolute value in different frequencies, acquired by acoustic field mapping apparatus.
Section view of the single-axis ultrasonic levitator. The pressure field (right) was numerically computed using boundary elements, and the resulting Gor’kov potential for a small rigid sphere is shown on the left.
The sound pressure level generated by the actuator (28.5 kHz)
The actuators velocity distribution at about 28.5 kHz

Parametric amplification

Videos

Topology optimization

Test case – a beam’s cross section optimization for noise reduction

Standing-wave 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

 

 

 

  • Dolev, A., and Bucher, I,. “Dual frequency parametric excitation of a nonlinear multi degree of freedom mechanical amplifier with electronically modified topology,”Journal of Sound and Vibration 419 (2018): 420-435. doi: 10.1016/j.jsv.2018.01.008.
  • Gabai, R., Farkash, B., Plat, H., Dolev, A., and Bucher I., “A vibrating mechanism for large amplitude, non-reciprocal motion, exploiting multiple buckling modes,” Mechanism and Machine Theory 121 (2018): 613-632. doi: 10.1016/j.mechmachtheory.2017.11.022
  • Tresser, S., Dolev, A., and Bucher, I., “Dynamic balancing of super-critical rotating structures using low-speed data via parametric excitation,” Journal of Sound and Vibration 415 (2017): 59-77. doi: 10.1016/j.jsv.2017.11.029
  • 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 Preparation

  • 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.