Post doctoral research
Advisor: Prof. Izhak Bucher
Full CV – LINK
Office: Lady Davis Building 366
- Intelligent and Optimal structures
- Dynamics and Vibrations
- System Identification
- Signal Processing
- Embedded systems and Control
Acoustic levitation and propulsion of silicon wafers: accurate positioning rotation and traveling wave based transportation
Photograph of an experimental setup capable of producing flexural waves of different qualities (standing waves to traveling waves), on an annular plate. This apparatus is capable of levitating and rotating a carried object without contact. Moreover, by controlling the quality of the flexural waves produced on the annular plate, it is possible to accurately position the carried object. (Demonstrations are presented in the movies section)
An acoustic levitation device, operating at its second axisymmetric flexural mode. The sand stays at the nodal diameters.
A small mass, levitated above an ultrasonically oscillating driving.
A 200 mm silicon wafer, levitated and propelled using traveling flexural waves produced on an annular plate.
Non-contacting accurate angular positioning of a levitated object, using flexural waves, produced on an annular plate. In order to control the angle of the handled object, the presented device produces flexural waves of different qualities (standing waves to traveling waves) according to the error between the wanted angle and the measured angle. (A plot describing the time response of the levitated object appears in the pictures section).
Demonstrating closed loop control of 3D DOF of an acousticly levitated wafer. (No contact)
A Bi-stable, 4 step motion swimme. Motion demonstrated.
A Swimmer, with two modes being excited, creating a travelling wave.
- Gabai, R., Ilssar, D., Shaham, R., Cohen, N., & Bucher, I. (2017). A rotational traveling wave based levitation device–Modelling, design, and control. Sensors and Actuators A: Physical, 255, 34-45.
- R. Gabay and I. Bucher, “The Spatial and Temporal Excitation Generating Traveling Waves in Structures”, Journal of Applied Mechanics, Volume 77, Issue 2, 2009.
- R. Gabai and I. Bucher, “Excitation and sensing of multiple vibrating traveling waves in one dimensional structures”, Journal of Sound and Vibration, 319 (1-2), pp. 406-425, 2009.
- A. Minikes, R. Gabay, I. Bucher and M. Feldman, “On the sensing and tuning of progressive structural vibration waves”, IEEE Trans. Ultra-son., Ferroelect., Ferq. Contr.
Refereed papers in conference proceedings
- I. Bucher*, D. Ilssar, R. Gabai, N. Cohen, R. Shaham and S. Davis, Controlled acoustic levitation – physical model and real-time digital implementation, IEEE International conference on Advanced Intelligent Mechatronics, Banff Alberta Canada, July 2016.
- Ran Gabay, Izhak Bucher, Resonance tracking in a squeeze-film levitation device, Mechanical Systems and Signal Processing 20 (2006) 1696-1724.
Other conference contributions
- R. Gabai*, I. Bucher, D. Ilssar and N. Cohen, Acoustic Levitation and Propulsion Based on Traveling Waves Control, The 34th Israeli Conference on Mechanical Engineering, Haifa Israel, November 2016.