Dynamic characteristics of a combined bellows and liner flexible joint

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Author(s): Thomas Englund, Johan Wall, Kjell Ahlin, Göran Broman
Title: Dynamic characteristics of a combined bellows and liner flexible joint
Journal: Journal of Automobile Engineering
Year: 2004
Volume: 218
Issue: 5
Pagination: 485-493
ISSN: 0954-4070
Publisher: Professional Engineering Publishing
ISI number: 000221990000002
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Mechanical Engineering (Sektionen för teknik – avd. för maskinteknik)
School of Engineering S- 371 79 Karlskrona, School of Engineering S- 371 79 Karlskrona
+46 455 38 50 00
Authors e-mail: johan.wall@bth.se
Language: English
Abstract: A bellows combined with an inside liner and an outside braid is commonly used as a flexible joint in automobile exhaust systems to reduce transmission of engine movements to the exhaust system. It greatly influences the dynamics of the complete system. Understanding of its dynamic characteristics and a modelling method that facilitates systems simulation are therefore desired. This has been obtained in earlier works for the bellows itself. In this work an approach to the modelling of the combined bellows and liner joint is suggested and experimentally verified.
Simulations and measurements show that the liner adds significant non-linearity and makes the characteristics of the joint complex. Results are presented for the axial and the bending load cases.
In torsion, influence of the liner is negligible. Peak responses are significantly reduced when the
excitation level approximately corresponds to the friction limit of the liner. The complexity of the
combined bellows and liner joint is important to know of and consider in exhaust system design and proves the necessity of including a model of the liner in the theoretical joint model when this type of liner is present in the real joint to be simulated.
Subject: Mechanical Engineering\Structural Dynamics
Keywords: beam model, dynamic, experimental investigation, flexible joint, friction, liner, non-linear