Determination of the Acoustic Efficiency of Materials and Structures in Laboratory and Real Conditions. Part 2: Vibration Absorption

In the reverberation chambers of the ÀC-11 acoustic facility and on the Yak-42 plane (AS-14 test bench) a complex of experiments to determine the comparative efficiency of five types of multilayered reinforced vibration absorbing material was carried out. Sound transmission loss, vibrations, radiation loss factors, and total loss factors of the onboard design of the AS-14 test bench and the test panel at the AC-11 acoustic facility are determined in the case of various types of vibration absorbing material. Comparative efficiency of the vibration absorbing materials depending on operating conditions is proven. It is shown that in conditions close to real ones, the efficiency of vibration absorbing materials can differ considerably from the values obtained when carrying out laboratory tests.