Vibration Reduction of Blading Using Interconnecting Elements
Bladed discs often require devices to reduce blade vibration to eliminate the risk of fatigue failure. Different industries employ different approaches to the problem with varying levels of success. The most common vibration reduction method is to use an interconnecting element between each adjacent blade and create coupling effects which introduce a form of damping. Small steam turbines commonly employ riveted shrouds, large turbo-chargers invariably use lacing wires, some gas turbines use blades with integral shroud elements and many turbine assemblies use connecting elements which lock into place with increase in rotational speed.
This paper explores the vibration reduction opportunities offered by using continuous connections between blades with lacing wires and compares the vibration characteristics with the behaviour of integrally shrouded blades. The paper describes the mathematical modelling work required to obtain a true representation of a blade system and describes the multi-bladed response of both laced blading and integrally shrouded blades.
KeywordsFatigue Steam Compaction Acoustics Tami
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