Research On Vibrational And Acoustical Characteristics Of Main Apparatuss And Sound Insulation Properties Of Acoustic Enclosures In UHV Power Stations

Comapred with conventional engineering noise control,noise control in ultra-high-voltage(UHV)power tramission stations has many specificities.This thesis proposes a novel design idea for acoustic enclosures,which are comnonly used in industry,to be really suitabe in power tramission stations.First,we conducted some on-site experiments to obtain the vibrational and acoustical characteristics of transformers and reactors in Anji UHV power station,which are the main noise sources.We picked out the dominant vibrational surface of noise sources and found out that the vibrational and acoustical energy of noise source is concentrated on some low harmonics.Second,we assessed the sound insulaton property of acoustical enclosures being used in power stations by calculating the insertion loss of sound pressure and sound energy experimentally and computationally,respectively.We realized that the way now we design and construct acoustical enclosures has limited sound insulaton ability in power stations,so in the last,we investigated the sound tramission property of acoustical enclosures in every single frequency value and explored the conditions under which tramission loss of enclosures can get maxima.If we can tune the frequency values where transmission loss of enclosures gets maxima to be consistent with those frequency values which dominate the vibrational and acoustical energy of noise source,then the noise radiation level in power stations will be well controlled.