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ADINA예제[ADINA] dynamic 해석에서의 rolling 접촉 사용

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2020-11-24
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Rolling Contact in
Dynamic Analysis using ADINA

Bergstrom-Boyce 와 Three-Network model 의 이해



Presentation Overview

● Problem description
● Recommendations for a smooth contact response
● In-depth discussion to understand the reasons behind these recommendations

Rolling Contact in Dynamic Analysis

● Class of problem where the dynamic behavior of two or more bodies rolling over each other is important
● Examples including analysis of bearings, cams, gears, multi-body assemblies (e.g. scroll compressors), etc.
● Finite element analysis accounts for flexibility of bodies which is important for the correct vibrational response









Rocker Problem Description

● Consider the problem shown below where a rocker is held in a tilted position, and then released and allowed to rock under gravitational loading









Rocker Problem



Rocker Problem

● Obtaining smooth contact forces and accelerations is more difficult than obtaining smooth displacements and stresses
● Simple rocker problem demonstrates how a smooth contact response can be obtained using ADINA
● Model captures elastic response, including vibrational modes
● Fourier analysis can be performed on the solution to determine resonance frequencies



Recommendations for Smooth Contact Response

● Use Bathe implicit time integration method with time step size that accurately captures frequency range of interest
● Use large displacement kinematic assumptions
● Use tight contact force convergence tolerance (RCTOL=1.0E-3)
● Use fine first-order mesh for the contactor surface. This can be achieved using 3D plane stress (membrane) elements


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