TY - JOUR

T1 - Identification of the Effect of Ultrasonic Friction Reduction in Metal-Elastomer Contacts Using a Two-Control-Loop Tribometer

AU - Weinstein, Michael

AU - Nowroth, Christian

AU - Twiefel, Jens

AU - Wallaschek, Jörg

N1 - Funding Information: Funding: The research project entitled Reduction of the breakaway force in the pneumatic cylinder using ultrasonic vibrations was funded by the German Research Foundation (DFG) under the research number TW75/3-1. The publication of this article was funded by the Open Access Fund of the Leibniz Universität Hannover. The authors would like to thank them for the support. Funding Information: Acknowledgments: The research project entitled “Reduction of the breakaway force in the pneumatic cylinder using ultrasonic vibrations” was funded by the German Research Foundation (DFG) under the research number TW75/3-1. The authors would like to thank them for the support.

PY - 2021/7/7

Y1 - 2021/7/7

N2 - Pneumatic cylinders are widely used in highly dynamic processes, such as handling and conveying tasks. They must work both reliably and accurately. The positioning accuracy suffers from the stick-slip effect due to strong adhesive forces during the seal contact and the associated high breakaway forces. To achieve smooth motion of the piston rod and increased position accuracy despite highly variable position dynamics, sliding friction and breakaway force must be reduced. This contribution presents a specially designed linear tribometer that has two types of control. Velocity control allows the investigation of sliding friction mechanisms. Friction force control allows investigation of the breakaway force. Due to its bearing type, the nearly disturbance-free detection of stick-slip transients and the dynamic contact behavior of the sliding friction force was possible. The reduction of the friction force was achieved by a superposition of the piston rod’s movement by longitudinal ultrasonic vibrations. This led to significant reductions in friction forces at the rubber/metal interface. In addition, the effects of ultrasonic frequency and vibration amplitude on the friction reduction were investigated. With regard to the breakaway force, significant success was achieved by the excitation. The force control made it possible to identify the characteristic movement of the sealing ring during a breakaway process.

AB - Pneumatic cylinders are widely used in highly dynamic processes, such as handling and conveying tasks. They must work both reliably and accurately. The positioning accuracy suffers from the stick-slip effect due to strong adhesive forces during the seal contact and the associated high breakaway forces. To achieve smooth motion of the piston rod and increased position accuracy despite highly variable position dynamics, sliding friction and breakaway force must be reduced. This contribution presents a specially designed linear tribometer that has two types of control. Velocity control allows the investigation of sliding friction mechanisms. Friction force control allows investigation of the breakaway force. Due to its bearing type, the nearly disturbance-free detection of stick-slip transients and the dynamic contact behavior of the sliding friction force was possible. The reduction of the friction force was achieved by a superposition of the piston rod’s movement by longitudinal ultrasonic vibrations. This led to significant reductions in friction forces at the rubber/metal interface. In addition, the effects of ultrasonic frequency and vibration amplitude on the friction reduction were investigated. With regard to the breakaway force, significant success was achieved by the excitation. The force control made it possible to identify the characteristic movement of the sealing ring during a breakaway process.

KW - Breakaway force

KW - Friction reduction

KW - Pneumatic cylinders

KW - Rubber/metal coupled contact

KW - Sliding friction force

KW - Stick-slip effect

KW - Ultrasonic vibrations

UR - http://www.scopus.com/inward/record.url?scp=85110561470&partnerID=8YFLogxK

U2 - 10.3390/app11146289

DO - 10.3390/app11146289

M3 - Article

AN - SCOPUS:85110561470

VL - 11

JO - Applied Sciences (Switzerland)

JF - Applied Sciences (Switzerland)

SN - 2076-3417

IS - 14

M1 - 6289

ER -