Dr. Yoseph Bar-Cohen and Dr. Zensheu Chang, JPL, Section 354
This website describes the Piezopump of the JPL's NDEAA Group
There is a range of NASA experiments, instruments and applications where miniature pumps are needed. To address such needs, a piezoelectrically actuated miniature pump is being developed under a NASA Code S PIDDP task. This pump employs a novel volume displacing mechanism using flexural traveling waves that acts peristaltically and eliminates the need for valves or physically moving parts. This pump is being developed for planetary instruments and space applications. Finite element model was developed using ANSYS for the purpose of prediction of the resonance frequency of the vibrating mode for the piezopump driving stator. The model is used to determine simultaneously the mode shapes that are associated with the various resonance frequencies. This capability is essential for designing the pump size and geometry. To predict and optimize the pump efficiency that is determined by the volume of pumping chambers the model was modified to perform harmonic analysis. Current capability allows for the determination of the effect of such design parameters as pump geometry, construction materials and operating modes on the volume of the chambers that are formed between the peaks and valleys of the waves. Experiments were made using a breadboard of the pump and showed water-pumping rate of about 4.5 cc/min and pumping pressure of 1100 Pascal. The pump is continually being modified to enhance the performance and efficiency.
"Piezopumps using no physically moving parts," Miniature Vacuum Pumps Workshop, July 20-21, 1999
"Piezoelectrically Actuated Miniature Peristaltic Pump," SPIE Smart Structures 2000, paper 3992-102
"Piezoelectrically Actuated Miniature Peristaltic Pump," SPIE Smart Structures 2001, paper 4327-52
Patent No. 5,630,709, May 20, 1997 Y. Bar-Cohen, "Pump Using Pistons
And Valve Made of Electroactive Actuators"
U.S. Patent No. 5,961,298, October 5, 1999 Y. Bar-Cohen, B. Joffe and S.-S. Lih "Traveling wave pump employing electroactive actuators"
A demonstration was made during the JPL
2000 Invention Challenge, December 8, 2000. The demonstration was entitled "Plumbing-free
water fountain using high-power focused ultrasonic waves."
Piezopump is currently being developed under a PIDDP task from NASA HQ, Code S, Discipline Scientist, Dr. Bruce Betts. The JPL's PIDDP manager is Dr. James Kaufman and the prior manager Dr. Greg Vane. The technology was initiated as a spin-off to the telerobotic (formerly TRIWG and currently CETDP Surface Systems) PDM task that was managed initially by Dr. Paul Schenker and currently by Dr. Hari Das. The JPL program managers for TRIWG has been Dr. Chuck Weisbin and currently the CETDP's Surface Systems Thrust manager, Dr. Samad Hayati.
Last update July 22, 2002