Abstract
Accurate contact modeling is of great importance in the eld of dynamic chain simulations. In this paper emphasis is on contact dynamics for a time-domain simulation model of large chains guided in a closed loop track. The chain model is based on theory for unconstrained rigid multibody dynamics where contact within the chain and with the track is dened through continuous point contacts using the contact indentation and rate as means. This paper presents an implicit method to determine contact parameters of the chain model through the use of none gradient optimization methods. The set of model parameters are estimated by minimizing the residual between simulated and measured results. The parameter identication is tested on four dierent formulations of the Hunt-Crossly hysteresis damping factor with the aim of recognizing a superior model.
Highlights
Contact models play a vital role in a variety of scientific fields
The presented parameter identification method is conducted for all 22 measurements for each of the four hysteresis contact models
Results form the comparison of the four hysteresis contact models are presented
Summary
Contact models play a vital role in a variety of scientific fields. The importance of accurate, reliable and fast contact models is shown by the wide range of literature on the subject dating back to 1882 where (Hertz, 1882) formulated one of the first contact models. The complex mechanics of interacting bodies make contact difficult to model as kinematics, geometry, material and surface properties have to be taken into account. Most models presented in the literature are simplified through assumptions that quantify specific types of body interactions. Assumptions like, pure static contact, low impact velocity, pure impact, point contact, no plastic deformation and pure linear elastic deformation are often used as means to simplify the model and speed up the computational time. Today a widely used contact model is the Hunt-Crossly model. The Hunt-Crossly model evolves from impact theory to replace the linear spring and damper model, which in the contact period may introduce both an infinite force gradient and tensional force. The Hunt-Crossly model assumes contact of perfect convex geometries by which the reaction force is applied in a single point on the two contacting bodies. The contact model evolves around the pure elastic contact model formulated by Hertz, as
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