01054360

Component

This paper describes how there is a strong impetus to reduce interior cabin noise in an effort to improve passenger comfort in the business jet realm. There are many potential noise sources that can adversely affect cabin sound levels and these noise sources can be separated into airborne and structure-borne sources. The primary airborne noise sources are the aerodynamic turbulent boundary layer noise, jet engine exhaust impingement, jet engine fan blade passage frequency (BPF) tones, environmental control system (ECS) airflow, outflow valve noise, and exit door seals. The structure-borne noise sources are engine fan (N1) and compressor (N2) rotational imbalances, hydraulic and fuel pumps, and other rotational equipment. Except for the ECS airflow and exit door seal noise, energy from all the above noise sources passes through aircraft structure before entering the cabin as radiated noise. The primary radiating structural surfaces that ultimately affect cabin sound levels are the fuselage structure, interior ceiling and side panels, floor panels, partitions/bulkheads, cabinets, stowage bins, and windows. Panel critical frequency is a major determinant of the frequency range at which these structures radiate best towards the cabin interior. This paper examines the relationship between panel critical frequencies and business jet cabin noise control.

01054353

English

pp 884-888

2004

Noise-Con 04. The 2004 National Conference on Noise Control Engineering

CD-ROM

Figures (1) ; References (12) ; Tables (1)

Air compressors; Aircraft; Aircraft cabins; Aircraft noise; Noise control; Noise sources; Passenger comfort; Sound transmission

Jets

Aviation; Environment; Vehicles and Equipment

TRIS, TRB

Jul 26 2007 1:54PM