A novel ultrasonic clutch using near-field acoustic levitation

Chang(張國財), Kuo-Tsi

doi:10.1016/j.ultras.2004.02.023

Cited by 15 publications

(6 citation statements)

References 8 publications

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“…Kundt developed the ultrasonic levitation technology in 1886; however, scientists began to widely study the levitation principle and its application only in the 1980s [16][17][18][19][20]. Our prior experimental results [21] indicate that: 1) The friction factor decreases when the contacted surfaces are vibrating; when the amplitude is up to 5 μm, the friction factor decreases to 10% of that without vibrating, it will be antifriction between the shaft and bearings.…”

Section: Mechanism Of Ultrasonic Levitation Technologymentioning

confidence: 99%

Performance investigation on ultrasonic levitation axial bearing for flywheel storage system

Peng

Yang

Kan

et al. 2009

Front. Mech. Eng. China

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The bearing is an important basic mechanical part for supporting a shaft. A flywheel storage system needs a type of noncontact support bearing to enhance the speed of the axis. A magnetic suspension bearing is one type of noncontact bearing but has electromagnetic interference to other electric equipment. Based on the performance research of ultrasonic levitation technology, a novel noncontact bearing called ultrasonic bearing is presented, which consists of a special piezoelectric vibrator supporting the load. Experiments are carried out to study the relationships among the amplitude of the vibrator and levitation clearance, the highest speed of the axis, and the frictional moment of the axis. Results show that the levitation clearance becomes smaller gradually with increasing load; the rotation speed is up to 8946 r/min, and the friction moment is only 2.095Â10 -5 N$m when the levitation clearance is 8.53 μm. The ultrasonic bearing is highlighted because of its simple structure, strong levitation ability, and low friction moment.

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Section: Mechanism Of Ultrasonic Levitation Technologymentioning

confidence: 99%

Performance investigation on ultrasonic levitation axial bearing for flywheel storage system

Peng

Yang

Kan

et al. 2009

Front. Mech. Eng. China

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show abstract

“…The simplified model based on Boyle's law explains that load carrying capacity is induced by relative normal motion between two planes. It is reported that facing planes with gaps of several micrometers can produce load carrying capacity [11,12]. When one of the planes is an excited traveling wave, the other (plane) moves in the direction that the excited wave propagates by near-boundary streaming.…”

Section: Principle Of Non-contact Usmmentioning

confidence: 99%

“…Furthermore, geometrical errors in the rotor and stator require a decrease in the amplitude of vibration in order to avoid contact between them. It has been reported that rigidity is saturated above a certain frequency and amplitude [11,12]. Therefore, increasing the amplitude more than necessary to raise the stiffness should be avoided to prevent mechanical damage.…”

Section: Static Spring Constant Of Air Filmmentioning

confidence: 99%

Frequency characteristics of non-contact ultrasonic motor with motion error correction

Isobe

Kyusojin

2007

Precision Engineering

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“…Conventional clutches include electromagnetic clutches [2,3], gear clutches [4,5], friction clutches [1], overrunning clutches [6,7] and centrifugal clutches [8]. Car manufacturers requirements for greater power transmission, lightweight, low cost design, smaller design space, high comfort and high effectiveness lead to develop new clutches mechanisms such as ultrasonic clutch [9] or piezoelectric clutch [10]. Nevertheless, today's passenger cars and light trucks are now almost exclusively equipped with conventional friction clutches (i.e.…”

Section: Introductionmentioning

confidence: 99%