How do you optimize road noise performance considering tire-suspension-body interactions?

Road noise optimization requires system-level approach: 1) Tire selection - analyze force transmissibility versus road roughness inputs, cavity mode frequency, and tire construction effects; 2) Suspension tuning - bushing rates for isolation without degrading handling, knuckle/spindle stiffness, shock absorber damping optimization; 3) Attachment compliance - subframe bushings, body mount characteristics, maintaining isolation while controlling movement; 4) Body response - panel modes, point mobility at attachment locations, acoustic cavity modes; 5) Acoustic treatments - barrier materials, absorption placement based on path contribution. Transfer path analysis guides priority areas. Trade-offs exist between isolation (soft bushings) and handling precision. Solution combines hardware optimization, mount tuning, and targeted treatments based on frequency band contribution analysis.