Abstract:This study experimentally investigated the influence of angular distribution of a grooved surface on wear properties as well as friction-induced vibration and noise characteristics. The surfaces of brake disc material were modified by cutting grooved surfaces with different angular distributions. The differences between the grooved and smooth surfaces in friction and wear and friction-induced vibration and noise were evaluated. This was performed via a pad-on-disc test configuration where the brake pad materia… Show more
“…The RPTS also shows severe wear situation with significant furrow and material transfer on the surface. In addition, as the round pits are filled with wear debris, the sizes of some round pits are seriously reduced and part of round pits are even disappeared, which accordingly triggers the generation of FIV phenomenon [23,24]. Figure 7 The worn surface characteristics of smooth surface (a), RPTS (b), SPTS (c) and GTS (d) observed by SEM.…”
Three kinds of laser surface texture (LST), i.e. square pit-textured surface (SPTS), round pittextured surface (RPTS) and groove-textured surface (GTS), are fabricated on the flat brass (H65) sample surfaces. The current-carrying tribological behaviour of these surfaces are investigated. It is noticed the COFs of smooth surface, SPTS and RPTS are all greater than 0.6 after the test, while the GTS has the lowest COF, which remains around 0.2 throughout the test. The vibration signals detected from all surfaces indicate the larger COF will not trigger the FIV generation in this state. All the texture surfaces will not cause electrical contact breaks. Worn surface analysis indicates the wear level of GTS is the weakest, with slight damage and debris accumulation occurs along the groove edges. Finite element analysis is performed to calculate the variation of contact force, contact temperature and voltage signal, and the test results can be well explained.
“…The RPTS also shows severe wear situation with significant furrow and material transfer on the surface. In addition, as the round pits are filled with wear debris, the sizes of some round pits are seriously reduced and part of round pits are even disappeared, which accordingly triggers the generation of FIV phenomenon [23,24]. Figure 7 The worn surface characteristics of smooth surface (a), RPTS (b), SPTS (c) and GTS (d) observed by SEM.…”
Three kinds of laser surface texture (LST), i.e. square pit-textured surface (SPTS), round pittextured surface (RPTS) and groove-textured surface (GTS), are fabricated on the flat brass (H65) sample surfaces. The current-carrying tribological behaviour of these surfaces are investigated. It is noticed the COFs of smooth surface, SPTS and RPTS are all greater than 0.6 after the test, while the GTS has the lowest COF, which remains around 0.2 throughout the test. The vibration signals detected from all surfaces indicate the larger COF will not trigger the FIV generation in this state. All the texture surfaces will not cause electrical contact breaks. Worn surface analysis indicates the wear level of GTS is the weakest, with slight damage and debris accumulation occurs along the groove edges. Finite element analysis is performed to calculate the variation of contact force, contact temperature and voltage signal, and the test results can be well explained.
“…25-35% reduction in the friction coefficient, 15-40% vibration reduction, at relatively high loads (p H ¼ 0.7-1.0 GPa) at rolling/sliding velocities (0.04-0.16 m/s). [3][4][5][6] Significant reduction in the frictional torque, vibration amplitude, and temperature rise are also reported with grease-lubricated textured thrust ball bearing. 10 Looking at the encouraging results with concentrated textured contacts, it is worth exploring here for enhancing the tribological behaviors of reciprocating lubricated point contacts at high loads (up to 3 GPa) using low and high viscous oils.…”
Section: Introductionmentioning
confidence: 88%
“…Recently, surface texture has emerged as a viable technology for improving the tribodynamics behavior of concentrated contacts. [3][4][5][6][7][8][9][10] It is found that certain textures reduce the vibration and friction coefficient at the lubricated contacts due to the enhanced value of damping due to better lubrication. Lubricated textured point contacts have yielded beneficial results i.e.…”
The tribo-performance behaviors of lubricated textured point contacts have been explored herein at relatively high contact loads (up to 3 GPa) under reciprocating motion (0.2 and 0.4 m/s) employing low (ν@40 ℃ = 100 cSt) and high (ν@40 ℃ = 422 cSt) viscous oils. In this experimental study, two contacts (flat conventional surface vs. polished ball and textured flat surface vs. polished ball surface) have been created for the investigations of friction, wear, and contact potential (ability for film formation). It is found that in the presence of texture at the concentrated contacts, the coefficient of friction and wear have reduced considerably with high viscous oil irrespective of operating parameters. However, low viscous oil has yielded an increase in the wear under identical operating parameters. The contact potential (an indirect indication of film formation during the running-in period) in the presence of texture develops rapidly as compared to the conventional surface with both oils. It has demonstrated a reduction in the running-in period in the presence of textures at the contacts. The optical microscope images of worn surfaces of balls and tracks have also been presented for the quantification of wear and understanding of the associated mechanisms.
“…In recent years, many scholars have begun to use various surface treatment methods to study the in uence of surface treatment of brake discs/plates on brake friction vibration and noise. Zhang Kangzhi et al [7] used the nite element analysis method to explore the in uence of friction plate surface grooving on the friction vibration characteristics of the system, and the results showed that the grooving of the disk surface had a certain degree of suppression effect on the friction vibration noise of the system. Liu et al [8] cut different angle grooves on the surface of the brake disc, and the in uence of grooves distributed at different angles on the friction vibration and noise of the brake disc was studied by experimental method, and the results showed that the ability of the brake disc to suppress noise was closely related to the angle distribution of the surface groove.…”
Aiming at the problem of friction, vibration and noise during braking of disc brakes, the surface of the brake disc is micro-shaped with different densities and different angle distributions, and the finite element model of the disc brake is established. The complex eigenvalue analysis method was used to explore the influence of micro-modeling with different density and angle distribution on the friction and vibration characteristics of disc brakes under different working conditions. The results show that with the increase of braking pressure, the vibration instability of disc brakes increases. The speed of the brake disc has no obvious effect on the vibration stability of the brake; Increasing the elastic modulus of the brake disc will significantly reduce the friction vibration noise of the brake and improve the vibration stability of the brake when braking. The vibration stability of brakes with surface micro-modeling is significantly better than that of the original brakes under different pressure and speed conditions and the elastic modulus of the brake disc, and this paper provides a new idea for the structural optimization of brake vibration and noise reduction.
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