Optimal suspension parameter distributions and roadway profiles for isolation of heavy trucks

Heavy trucks are known to have ride problems and are difficult to isolate f rom roadway unevenness. Heavy trucks are rich in modal density and are stif fly sprung, a combination that makes isolation difficult. Due to their inhe rent mass, trucks create roadway unevenness as they move along a roadway. E ach following truck is excited by the unevenness created by the preceding o ne, and the road condition worsens over time. It is shown that trucks creat e roadway profiles from which perfect isolation is possible by having the p roper parameter distribution in the suspension units. One distribution is b est for rigid body isolation and one is best for 'beaming' isolation.