Noise radiation from
air-conditionning system gaz transmission hoses: The
extremities of the gaz transfer hose system are connected to the car body and to the
engine. Relative motion between the engine and the car body results in the vibration of
the hoses and in some cases can produce noise radiation, reduction of which is one of the
major concerns in modern car design. Moreover, fatique of the system components (metal
tubing, reinforced rubber hoses, etc.) have to be also studied.
In this study, first a non-linear analysis is performed to
simulate the assembly of the system in the car; then, harmonic responce analysis is used
to calculate the vibration velocities in the frequency range of interest; and finally
acoustic radiation is done to calculate the sound pressure level.
This study is typical, and similar automotive components and
systems (engine valve cover, brakes, panels, etc.) have been also simulated.