The Influence of Vacuum Level on the Friction Force Acting on the Pneumatic Cylinder Sealing Ring

Abstract

Presented in this paper are the results of measurement of friction force acting on the pneumatic cylinder sealing rings under high vacuum atmosphere. The investigations were conducted at relatively low levels of sliding speed of the sealing ring. Special device was constructed and implemented to facilitate this experiment. The results indicate the importance of the vacuum level on the friction force magnitude. Higher vacuum levels influence significant increase of friction force. Special phenomenon is the decreasing of friction force at higher sliding speeds of the sealing ring along the cylinder, under the constant vacuum level. Therefore, detailed examination of this phenomenon in the domain of high sliding speeds could yield interesting results.

Loop-the-Loop as a Real Tribomechanical System Applicable in Engineering Education

“…The length The calculations are based on the measurement of the ball's range and the Eqs. ( 1), ( 2), (3), and (7). After leaving the track at point "D", the ball moves according to the law of oblique projectile motion and lands on a horizontal part of the apparatus made of equal sections with a meter on the upper side (Fig.…”

“…Demonstration of the effects of friction in laboratory conditions that enables students to understand the theoretical bases, acquiring the relevant knowledge necessary for future engineering practice at the same time, sometimes requires the development of special devices. For example, considering the growing number of devices operating under high vacuum, Tadic et al [7] constructed a device to measure the friction force acting on the pneumatic cylinder sealing rings under a high vacuum. In a similar context related to the implementation and the effects of friction in real dynamic conditions, Mihajlovic et al [8] developed a RESEARCH vibroplatform model to study the friction between the screen and sand granules.…”

Development of a new high-precision friction test platform and experimental study of friction characteristics for pneumatic cylinders

“…With the development of science and technology, pneumatic technology is showing a new situation of vigorous development, and its measurement technology is also advancing with the times. The main tests related to pneumatics are valve port flow test [1,2], vessel volume test [3], chamber pressure test [4], pneumatic cylinder friction test [5][6][7][8][9][10][11][12][13][14][15][16], etc. As one of the most commonly used actuators in pneumatic systems, pneumatic cylinders are widely used in industry [17][18][19][20].…”

“…The direct test method is to drive the pneumatic cylinder to be tested by external force (such as electric cylinder, hydraulic cylinder and pneumatic cylinder), which is characterized by a force transducer. According to the installation method, the force transducer can be divided into two types: mobile type [5][6][7][8][9] and fixed type [10][11][12][13][14][15][16]. In force measurement, the mobile installation is sensitive to dynamic loads and inertial effects.…”

“…In the remaining cases of the direct test method, the pneumatic cylinders under test are mostly driven by electric actuators [6][7][8][9][10][11][12][13][14], because it can provide a wider low-speed measurement range than by a hydraulic cylinder or a pneumatic cylinder. Therefore, some representative cases are listed below.…”