Variable volume resonators using the Belleville spring principle
AssigneeMesserschmitt-Bolkow-Blohm GmbH
InventorOskar Bschorr
Life of this patent
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Abstract
The present variable volume resonators have an inner volume enclosed by wall members constructed as Belleville springs. The wall members confine in said volume a pressure which is reduced relative to atmospheric pressure, whereby the springs have a small spring constant in response to a reduced pressure load. Each resonator is so constructed that it has a relatively large resonating surface and a relatively low resonating mass. The sound damping effect of the resonator volume is enhanced by means of various types of damping devices including a high viscosity residual gas, wire mesh members, or liquid drops in the volume interior. The present resonators also comprise features for compensating air pressure and/or the resonance frequency.
Claims11
A variable volume resonator for damping noise, comprising resonator wall means confining a volume which is at least partially evacuated;
- said wall means being constructed to form Belleville spring means, whereby said wall means have a small spring constant in response to reduced pressure loading relative to atmospheric pressure, said wall means comprising a central wall area, a peripheral wall area and shoulder means operatively located between the peripheral wall area and the central wall area of said wall means, said shoulder means connecting said central wall area to said peripheral wall area at least one of said wall means having a domed shape, said wall means having a given wall thickness "s", said domed shape having a height "h" within the range of about 0.5 to 5.0 times said given wall thickness "s", said wall means further having an effective diameter "d" within the range of about 30 to 300 times said given wall thickness "s".
Dependencies are inferred from the claim text.