Wear Behavior of Laser‐Patterned Piston Rings in Squeeze Film Dampers

Abstract

Machine components experience large tribological stresses during their lifetime. Due to the kinematics and the applied load, many of these components work under mixed or boundary lubrication conditions, with direct contact of both rubbing surfaces. Wear, thus plays a significant role in these two lubrication regimes, determining component life time. Laser surface patterning (LSP) can produce a well-defined surface topography in order to improve the tribological properties under boundary and mixed lubrication, including reduced wear. In this research work, the piston rings (PRs) of a squeeze film damper (SFD, stainless steel MSRR 6503) are patterned with a dot-like surface structure (4 mm spacing and ca. 1 mm depth) produced by three-beam laser interference from a solid state Nd:YAG laser with a pulse duration of 10 ns and wavelength of 355 nm. The wear behavior of these laser-patterned PRs is compared to that of conventional ground PRs. The tribological tests are performed on a special test rig for SFDs. The tested surfaces are then analyzed by white light interferometry in order to study the underlying wear mechanism and to estimate the corresponding wear volume. This analysis demonstrates an 85% reduction in the wear volume of the laser-patterned PRs. The designed surface topography can store wear particles in the topographic minima, removing them from the contact zone, thus reducing the amount of abrasive wear and the wear volume.

Surface roughness effects on non-Newtonian MHD non-parallel squeeze film bearing

“…Therefore, the surface roughness has a noticeable effect and must be taken in consideration. Different methods have been made to study the surface roughness effect on the bearing performance (Christensen, 1969; Patir and Cheng, 1978; Almqvist et al , 2007; Rosenkranz et al , 2015; Grützmacher et al , 2019). Homogenization method, based on an asymptotic expansion, involves the study of partial differential equations having rapidly oscillating coefficient.…”

Damping characteristics of integral squeeze film dampers on vibration of deep groove ball bearing with localized defects

“…Zhang and Lu (2017) investigated the dynamic behavior of a rotor-bearing-SFD system with the inner race defect of bearing, and it was proven theoretically that SFD can enhance the system stability under the bearing fault. Rosenkranz and Jaeger (2015) used LSP (laser-patterned piston) to improve the tribological properties and reduce wear in SFD. The improved integral squeeze film damper (ISFD) integrated into a whole via The authors acknowledge the support from National Natural Science Foundation of China (No.51705302) and Shanghai Key Laboratory of Intelligent Manufacturing and Robotics.…”

Dynamic characteristics of elastic ring squeeze film damper

“…Zhou et al (2013) proposed two dynamic models for the dual clearance squeeze film damper (DCSFD) and validated the numerical results with the experimental outputs. Rosenkranz improved the frictional behavior of the piston rings on SFD by surface texturing; the surface texture proposed reduced the wear volume of the piston rings and extended the lifetime of SFD (Rosenkranz et al, 2015).…”