Numerical analysis of the vibration and acoustic characteristics of large power transformers

摘要

This thesis presents a numerical methodology to predict the noise and vibration characteristics of large power transformers. The approach, which focuses on a vibro-acoustic finite element simulation, has been validated by appropriate experimental measurements and is shown to identify both the local and global acoustic behaviour of a transformer under nominal operating conditions. Furthermore, analysis methods presented in this thesis have illustrated a transformer's complex vibration characteristics that result in elevated noise levels. An understanding of such vibration characteristics together with acoustic predictions will better enable transformer manufacturers to consistently meet noise emission targets set by customers and regulators.