Development Of A New Low-friction Cylinder Based On Ultrasonic Vibrations Induced Friction Reduction Theory

As a common modern automated production system,the pneumatic system iswidely used in modern industrial production.Cylinder is the most important actuatorin pneumatic system,whose friction characteristics is the main reasons for thecylinder stick-slip motion.Recently, as a new way to reduce the friction,the frictionreduction by ultrasonic vibrations has attracted a wide attention. This article willintends to applied the ultrasonic vibration to the tube of cylinder, applied theultrasonic vibration of the cylinder tube to improve the friction characteristics ofpneumatic cylinder.To achieve the design of a new ultrasonic cylinder, we must to choice therational mode and the way of exciting ultrasonic vibration. This article describes thevibration mode functions and the frequency formula of the beam.what’s more,themethod of exciting has be given. Especially, this article has be given the multiplewave bending vibration mode of the cylindrical beam,has analysed thecharacteristics of the vibration mode,and has described the method exciting ofsandwiching for it,All of these contribute for the development of a new ultrasoniccylinder.Based on the vibration characteristics of the cylinder,we select two kind of theexciting method,the one is based on the longitud inal vibration of the cylindertube,and the other is based on bending vibration of the cylinder tube, With Thisanalogize,we designed two new ultrasonic cylinder, the one is upon the longitudinalvibration of the cylinder tube which is exciting by a ultrasonic transducer,the otheris upon the bending vibration of the cylinder tube which is exciting by plate-attached type’s piezoelectric ceramics.We also describe the working principle of thetwo new cylinders,and establish the particle trajectory equation of thecylinder.what’s more,we also research on the mechanis m why the ultrasonicvibration can reduce the friction.We obtain the fact that the friction of the cylinderis related with the amplitude of ultrasonic vibration.We analys is the modal, transient and harmonic response of the cylinder byFEM.,and get its resonant frequency and mode shape contours.also prove thecorrectness of the particle trajectory equation and the exciting method. Based it,wehave developed the two new cylinder.Also we have study on the relationshipbetween the the amplitude of ultrasonic vibration with the excitation voltage,whichprovides guidance for the next experiment. A control system for testing the characteristic of the new ultrasonic cylinderhave created,And we have completed the test for the two new ultrasoniccylinder.With ultrasonic vibration,the its friction have reduced54.3%of thatwithout vibrations. The percentage of friction reducing is proportional to theexcitation voltage. The percentage of friction reducing of the ultrasoniccylinder,which exciting by the bending vibration of the cylinder tube,is inverselyproportional to the gas pressure. However,the percentage of friction reducing of theother new cylinder is not affected by the gas pressure.The ultrasonic vibration onthe cylinder has improved the characteristic of the cylinder’s friction which changegreatly with time.