FEA Based Frequency Optimization Of Duct With Variable Cross Section Through Structural Modifications For Avoiding Resonance

摘要

Ducts are used to carry fluid in various applications in HVAC systems, thermal power plants, cement and other process industries. Such ducts are generally subjected to failure due to cyclic stresses either caused by high temperature fluctuations, mechanical vibrations or due acoustic vibrations caused due to the fluid flowing through the ducts. In this paper we study the failure of one such duct in which acoustic vibrations cause resonance leading to weld failure and cracks. A lot of work has been earlier done to improve the frequency of ducts using CFD analysis for finding the nature of the flow, effect of the varying C/S of the duct on the flow and duct vibration. Through the earlier works, the methods like active noise control, and development of mathematical model for finding analytical solutions to the duct acoustic failure have been demonstrated