On aircraft carriers, jet noise is transmitted to the gallery deck through several paths. Gallery Deck Noise Path Acoustic energy can be transmitted directly through the flight deck and immediately re-radiated. Jet noise also excites (forces vibration on a system by its surroundings) ship structure (overheads, bulkheads, catapult trough, and deck), which then radiate acoustically into the gallery spaces (see Figure 3). Other paths for structural excitation are jet exhaust impingement on the Jet Blast Deflector (JBD) and vibration transmission through the airplane tires, the catapult tow bar, and the catapult restraint bar.
• Other significant sources of airborne noise on the gallery deck are the catapult, JBD, and arresting gear equipment. This machinery produces high airborne noise levels and also excites ship structure. Typical airborne noise levels from various locations on the gallery deck are shown in Figure 4 above