On Contact Mechanisms and Mechanical Transmission Performance
(2004)- Abstract
- This thesis consists of four papers, which treat the modelling of a spur gear set and a disc brake, and the interaction between the machine elements. Features of the performance are studied in relation to the initial stated assumptions. Initially, a method for analysing the influence of profile errors upon load-sharing capabilities and mesh stiffness of spur gears was proposed. The contacts between mating gear teeth were identified in the deformed state. In addition, artificial neural networks were employed for system identification. The discussion was focused upon the dependency between the contact ratio and the load in addition to the influence of profile and pitch errors. Experimental data validated the reliability of the approach.... (More)
- This thesis consists of four papers, which treat the modelling of a spur gear set and a disc brake, and the interaction between the machine elements. Features of the performance are studied in relation to the initial stated assumptions. Initially, a method for analysing the influence of profile errors upon load-sharing capabilities and mesh stiffness of spur gears was proposed. The contacts between mating gear teeth were identified in the deformed state. In addition, artificial neural networks were employed for system identification. The discussion was focused upon the dependency between the contact ratio and the load in addition to the influence of profile and pitch errors. Experimental data validated the reliability of the approach. Following, a non-linear damping model for shaft torsional vibration studies was proposed and experimentally validated. The experiments showed that the internal shaft damping was highly non-linear. The damping tended to be not only stiffness related but also noticeably depended on the type of material. Friction induced noise due to the interaction of the mating teeth of a spur gear set was studied. For the shaft bearings, a non-linear damping model based upon the coefficient of restitution describing the interaction between the rolling elements and the inner- and outer race of the bearing was proposed. The non-linear support bearing model created a relation between the bearing stiffness in the path of contact of the mating teeth and the movement of the gears perpendicular to the path of contact. The presence of friction had its greatest effect upon the bearing force in the path of contact of the mating gear teeth at low angular velocities, and at mesh frequencies close to the natural frequency of the vibration perpendicular to the path of contact. Finally, the influence of the interaction between the disc of a floating disc brake assembly and connecting members was studied. In the initial process of the experimental research, high drag torque was acquired without applying force to the pads. The spline profile and the nave width were proven to have little effect upon drag, whilst the position on which the caliper was mounted had a considerable influence. Both the analytical study and the experimental measurements showed a strong correlation between the caliper position and the drag torque. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/467112
- author
- Maclennan, Lars LU
- supervisor
- opponent
-
- Dr Velex, Philippe, France
- organization
- publishing date
- 2004
- type
- Thesis
- publication status
- published
- subject
- keywords
- vacuum technology, vibration and acoustic engineering, Maskinteknik, hydraulik, vakuumteknik, vibrationer, akustik, hydraulics, Mechanical engineering, artificial neural network, experimental study, disc brake, dynamic analysis, shaft, Spur gear
- pages
- 153 pages
- defense location
- Room M:B, M-building, Lund Institute of Technology, Sweden.
- defense date
- 2004-06-11 10:15:00
- external identifiers
-
- other:ISRN:LUTMDN/TMME--1017--SE
- language
- English
- LU publication?
- yes
- additional info
- Article: 1. An Analytical Method to Determine the Influence of Shape Deviation on Load Distribution and Mesh Stiffness for Spur Gears.2. On the Experimental Validation of a Non-Linear Shaft Damping Model.3. On the Influence of Non-Linear Bearing Stiffness upon Spur Gear Friction Noise.4. Analysis of Brake Assembly with Floating Disc.
- id
- f505270c-9983-413d-a5c3-aa482e5798f0 (old id 467112)
- date added to LUP
- 2016-04-04 14:41:16
- date last changed
- 2018-11-21 21:21:42
@phdthesis{f505270c-9983-413d-a5c3-aa482e5798f0,
abstract = {{This thesis consists of four papers, which treat the modelling of a spur gear set and a disc brake, and the interaction between the machine elements. Features of the performance are studied in relation to the initial stated assumptions. Initially, a method for analysing the influence of profile errors upon load-sharing capabilities and mesh stiffness of spur gears was proposed. The contacts between mating gear teeth were identified in the deformed state. In addition, artificial neural networks were employed for system identification. The discussion was focused upon the dependency between the contact ratio and the load in addition to the influence of profile and pitch errors. Experimental data validated the reliability of the approach. Following, a non-linear damping model for shaft torsional vibration studies was proposed and experimentally validated. The experiments showed that the internal shaft damping was highly non-linear. The damping tended to be not only stiffness related but also noticeably depended on the type of material. Friction induced noise due to the interaction of the mating teeth of a spur gear set was studied. For the shaft bearings, a non-linear damping model based upon the coefficient of restitution describing the interaction between the rolling elements and the inner- and outer race of the bearing was proposed. The non-linear support bearing model created a relation between the bearing stiffness in the path of contact of the mating teeth and the movement of the gears perpendicular to the path of contact. The presence of friction had its greatest effect upon the bearing force in the path of contact of the mating gear teeth at low angular velocities, and at mesh frequencies close to the natural frequency of the vibration perpendicular to the path of contact. Finally, the influence of the interaction between the disc of a floating disc brake assembly and connecting members was studied. In the initial process of the experimental research, high drag torque was acquired without applying force to the pads. The spline profile and the nave width were proven to have little effect upon drag, whilst the position on which the caliper was mounted had a considerable influence. Both the analytical study and the experimental measurements showed a strong correlation between the caliper position and the drag torque.}},
author = {{Maclennan, Lars}},
keywords = {{vacuum technology; vibration and acoustic engineering; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik; hydraulics; Mechanical engineering; artificial neural network; experimental study; disc brake; dynamic analysis; shaft; Spur gear}},
language = {{eng}},
school = {{Lund University}},
title = {{On Contact Mechanisms and Mechanical Transmission Performance}},
year = {{2004}},
}