The Experts below are selected from a list of 83697 Experts worldwide ranked by ideXlab platform
El M Mansori - One of the best experts on this subject based on the ideXlab platform.
-
experimental study of the contribution of gear tooth finishing processes to friction noise
Tribology International, 2017Co-Authors: S Jolivet, S Mezghani, El M Mansori, R Vargiolu, H ZahouaniAbstract:Abstract Micro geometry of a gear tooth influences the contact durability and wear performance. In this paper, different gear tooth Flanks have been manufactured by different finishing processes, which were then characterized using multiscale surface analysis, based on wavelet transform. The friction noise was then measured before and after meshing in dry and lubricated conditions, to quantify the acoustic performance of the surfaces. To accomplish this objective, a new non-destructive sensory measurement technique was developed to characterize the friction noise generated by teeth Flank surface. Results show the ability of the new method to discriminate functional behavior of different surfaces as well as give possible explanations as to the contribution of tooth Flank asperities during the meshing on the gear in terms of gear noise performances.
-
experimental and numerical study of tooth finishing processes contribution to gear noise
Tribology International, 2016Co-Authors: S Jolivet, S Mezghani, J Isselin, El M MansoriAbstract:Abstract The contribution of gear tooth Flank surface micro-finish on gear noise has not yet been taken into consideration. This paper is devoted to study the simultaneous effect of tooth roughness and lubricant viscosity on automotive gear vibrations. The vibrations performances were evaluated on an instrumented test rig under both dry and wet conditions. A non-destructive replication technique coupled to 3D optical measures was used to acquire the Flanks topographies, which were characterized using multiscale decomposition. A three-dimensional finite element simulation of a helical gear was performed to assess the micro-scales impact on gear noise. Numerical representative surfaces morphologies were introduced into the simulation and compared through the transmission error calculation. Results have shown gear noise dependence on tooth finishing processes.
S Jolivet - One of the best experts on this subject based on the ideXlab platform.
-
experimental study of the contribution of gear tooth finishing processes to friction noise
Tribology International, 2017Co-Authors: S Jolivet, S Mezghani, El M Mansori, R Vargiolu, H ZahouaniAbstract:Abstract Micro geometry of a gear tooth influences the contact durability and wear performance. In this paper, different gear tooth Flanks have been manufactured by different finishing processes, which were then characterized using multiscale surface analysis, based on wavelet transform. The friction noise was then measured before and after meshing in dry and lubricated conditions, to quantify the acoustic performance of the surfaces. To accomplish this objective, a new non-destructive sensory measurement technique was developed to characterize the friction noise generated by teeth Flank surface. Results show the ability of the new method to discriminate functional behavior of different surfaces as well as give possible explanations as to the contribution of tooth Flank asperities during the meshing on the gear in terms of gear noise performances.
-
experimental and numerical study of tooth finishing processes contribution to gear noise
Tribology International, 2016Co-Authors: S Jolivet, S Mezghani, J Isselin, El M MansoriAbstract:Abstract The contribution of gear tooth Flank surface micro-finish on gear noise has not yet been taken into consideration. This paper is devoted to study the simultaneous effect of tooth roughness and lubricant viscosity on automotive gear vibrations. The vibrations performances were evaluated on an instrumented test rig under both dry and wet conditions. A non-destructive replication technique coupled to 3D optical measures was used to acquire the Flanks topographies, which were characterized using multiscale decomposition. A three-dimensional finite element simulation of a helical gear was performed to assess the micro-scales impact on gear noise. Numerical representative surfaces morphologies were introduced into the simulation and compared through the transmission error calculation. Results have shown gear noise dependence on tooth finishing processes.
Dirk Bartel - One of the best experts on this subject based on the ideXlab platform.
-
tehl simulation model for the tooth Flank contact of a single tooth gearbox under mixed friction conditions
Tribology International, 2020Co-Authors: Michael A Keller, Lars Bobach, Thomas Wimmer, Dirk BartelAbstract:Abstract This work is about the development of a thermal elastohydrodynamic calculation model for the tooth Flank contact of the single tooth gearbox. The boundary conditions for load, velocity and Flank profiles are precalculated using Finite Element Method modeling. Therefore, it is possible to get macroscopic deformed and distorted tooth Flanks for the elastohydrodynamic calculation. A method is provided to remove the Hertzian Deformation of the macroscopic deformed Flank profiles, since it should be calculated in conjunction with TEHL simulation. The influence of non-Newtonian and thermal modeling is investigated. Mixed friction is considered based on measured rough surfaces via indirect coupling. An example is given for the impact on the efficiency ratio and power loss, when the gear Flanks are adapted.
-
Thermal elastohydrodynamic simulation of involute spur gears incorporating mixed friction
Tribology International, 2012Co-Authors: Lars Bobach, Ronny Beilicke, Dirk Bartel, L. DetersAbstract:Abstract A model for calculating transient, three-dimensional, thermal elastohydrodynamic tooth Flank contacts in spur gears with involute gearing is presented. The calculation model is based on the combined numerical solutions of the generalized Reynolds, energy and Fourier heat equations. Mass conserving cavitation, non-Newtonian flow and the real involute characteristics of the tooth Flanks are incorporated. States of mixed friction and microhydrodynamic effects are ascertained integrally based on real-measured surface topographies. Straight spur gear pairs serve as an example to present the results of calculating the influence of surface roughness asperities and gearing geometry.
S Mezghani - One of the best experts on this subject based on the ideXlab platform.
-
experimental study of the contribution of gear tooth finishing processes to friction noise
Tribology International, 2017Co-Authors: S Jolivet, S Mezghani, El M Mansori, R Vargiolu, H ZahouaniAbstract:Abstract Micro geometry of a gear tooth influences the contact durability and wear performance. In this paper, different gear tooth Flanks have been manufactured by different finishing processes, which were then characterized using multiscale surface analysis, based on wavelet transform. The friction noise was then measured before and after meshing in dry and lubricated conditions, to quantify the acoustic performance of the surfaces. To accomplish this objective, a new non-destructive sensory measurement technique was developed to characterize the friction noise generated by teeth Flank surface. Results show the ability of the new method to discriminate functional behavior of different surfaces as well as give possible explanations as to the contribution of tooth Flank asperities during the meshing on the gear in terms of gear noise performances.
-
experimental and numerical study of tooth finishing processes contribution to gear noise
Tribology International, 2016Co-Authors: S Jolivet, S Mezghani, J Isselin, El M MansoriAbstract:Abstract The contribution of gear tooth Flank surface micro-finish on gear noise has not yet been taken into consideration. This paper is devoted to study the simultaneous effect of tooth roughness and lubricant viscosity on automotive gear vibrations. The vibrations performances were evaluated on an instrumented test rig under both dry and wet conditions. A non-destructive replication technique coupled to 3D optical measures was used to acquire the Flanks topographies, which were characterized using multiscale decomposition. A three-dimensional finite element simulation of a helical gear was performed to assess the micro-scales impact on gear noise. Numerical representative surfaces morphologies were introduced into the simulation and compared through the transmission error calculation. Results have shown gear noise dependence on tooth finishing processes.
Alberio Malinverno - One of the best experts on this subject based on the ideXlab platform.
-
inverse square root dependence of mid ocean ridge Flank roughness on spreading rate
Nature, 1991Co-Authors: Alberio MalinvernoAbstract:THE topographic roughness of mid-ocean-ridge Flanks is known to increase with decreasing spreading rate1–4, but the exact form of this relationship has not been established. As the topographic features that make up ridge Flank roughness (abyssal hills) are created near the axes of mid-ocean ridges by faulting and volcan-ism5–7, the relationship between roughness and spreading rate may shed light on the process of crustal accretion at spreading centres. Here I present measurements of ridge Flank roughness on profiles crossing the world mid-ocean-ridge system, which show that roughness is proportional to the inverse square-root of the spreading rate. This result is consistent with some very simple inferences of how the topographic roughness of mid-ocean-ridge Flanks scales with the lithospheric thickness near ridge axes, as determined by thermal models.
