An Alternative Slicing Technique to Consider Pressure Concentrations in Non-Hertzian Line Contacts

Teutsch, Roman; Sauer, Bernd

doi:10.1115/1.1739244

Cited by 38 publications

(16 citation statements)

References 8 publications

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“…e following discusses a calculation method for obtaining the above-described deformations and the formulation of basic geometric quantities after rotation. e local contact deformations δ HE and δ HI are calculated by the slice method [16], in which the logarithmic roller profile model is included. As shown in Figure 5, the sprag Figure 4: e deformations of components after rotation of the sprag roller.…”

Section: The Analytical Model Of Crownedmentioning

confidence: 99%

Analytical Modeling and Optimization of Logarithmic Sprag Clutch Considering Profile Modification

Huang

Zhao

Liu

2018

Shock and Vibration

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A new analytical model of a logarithmic sprag clutch considering profile modification is proposed to reflect the effect of profile parameters on the dynamic contact pressure distribution during the engagement, especially the edge stress of a sprag roller. In the model, a nonlinear iteration method of normal force including the logarithmic profile model with three parameters and structural deformations of races is given. The alternate friction model considering stationary and rate-dependency friction is formulated and applied in the contacts between the sprag rollers and races. Then, the kriging model describing the relationship between the maximum contact stress throughout the engagement and the profile parameters is established and validated, and the kriging-based optimization of the design parameters is proposed using genetic algorithms. In subsequent analysis, based on the presented analytical model and optimization process, the maximum contact stress throughout the engagement can decrease greatly through optimizing the profile parameters. Therefore, the results of the present paper could aid in the design of the logarithmic sprag clutch and help avoid end crush failure and low cycle fatigue of the sprag roller.

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Section: The Analytical Model Of Crownedmentioning

confidence: 99%

Analytical Modeling and Optimization of Logarithmic Sprag Clutch Considering Profile Modification

Huang

Zhao

Liu

2018

Shock and Vibration

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“…The local contact deformations and are calculated by the slice method [12] shown in Figure 4, in which the sprag is axially divided into a certain number of slices with equal length, and the interaction among the deflections of slices is established by the influence coefficient method. The functional relationship between load and deflection on each slice can be obtained as follows: In each of the above equations, [S ] is the matrix of the weighted influence coefficients with specific expression:…”

Section: The Geometry Deformation Coordinationmentioning

confidence: 99%

An Analytical Model of Multiarc Sprag Clutch considering Geometry and Internal Interaction during Engagement

Huang

Liu

Zhao

2017

Shock and Vibration

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A new multiarc sprag clutch model considering geometry and internal interaction during engagement is proposed in this paper. To increase the accuracy of the model, an improved model of geometric deformation coordination is presented to describe the basic geometrical quantities after rotation of the sprag. Then, based on this model, a novel nonlinear iteration method focusing on the varied contact radius is proposed to compute the normal contact force and show a good agreement with the FEM model. In addition, the alternate friction model considering stationary and rate-dependency friction is formulated and applied in the contacts of both the inner race and outer race. The proposed model is verified by comparison with other published results and experimental results. In subsequent analysis, the new model fully reveals the dynamical behaviors of the multiarc clutch during preload engagement under torque excitation; therefore, it will be useful for the performance analysis and dynamic design of multiarc sprag clutch.

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“…To get further insight into the contact characteristics the AST (advanced slicing technique) model has been developed [5] its rotation axis in order to detect edge stress. In contrast to calculations like DIN ISO 281 the slices are not considered independently [6] has an impact on the surrounding ones.…”

Section: Mbs Modelmentioning

confidence: 99%

Investigation of inner contact and friction conditions of a spherical roller bearing using multi-body simulation

Fiedler

Kiekbusch

Sauer

2011

Per. Pol. Mech. Eng.

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At the Institute of Machine Elements, Gears, and Transmission (MEGT, University of Kaiserslautern) a spherical roller bearing has been modeled in an multi body system (MBS) environment. The use of the commercial MBS (multi-body system) software (MSC ADAMS) allows the development of user-written subroutines for contact recognition and the calculation of contact forces. Those subroutines can help understanding the principles of friction phenomena inside spherical roller bearings, while the measurement of those effects is difficult.Measurements on a friction torque test rig for roller bearings are used to validate the MBS models. Since the sum of all contact forces equals the friction of the bearing, this test stand provides a way for validation of the contact and friction calculations.

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An Alternative Slicing Technique to Consider Pressure Concentrations in Non-Hertzian Line Contacts

Cited by 38 publications

References 8 publications

Analytical Modeling and Optimization of Logarithmic Sprag Clutch Considering Profile Modification

Analytical Modeling and Optimization of Logarithmic Sprag Clutch Considering Profile Modification

An Analytical Model of Multiarc Sprag Clutch considering Geometry and Internal Interaction during Engagement

Investigation of inner contact and friction conditions of a spherical roller bearing using multi-body simulation

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