[RWebb]

search on 'wave superposition'

the basics will be in a Fresh. or Soph. phsics text - from there you can go to intake design, exhaust design, audio speakers/room analysis, blood flow/hearts and a huge array of natural phenomena

Smith's book is wonderful but quite old (1950s?) -- doubt if it is in print but get your library to use inter-library loan

there must be some more recent book on all this but have not seen one that is minimally technical.

BTW - no one has yet mentioned the variable length intake runners used in some modern engine designs...

P AG uses Vario-Ram as their name.