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Multi-layer acoustic linings

  • US 4,410,065 A
  • Filed: 04/15/1981
  • Issued: 10/18/1983
  • Est. Priority Date: 05/17/1980
  • Status: Expired due to Fees
First Claim
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1. An acoustic lining forming at least a part of a peripheral wall of a flow duct in a fluid flow machine, said acoustic lining, while in situ as said at least a part of said peripheral wall absorbing sound without obturating sound and flow of fluid and having acoustic impedances capable of being varied to suit changing flow and noise conditions in said duct and comprising:

  • a perforate sound permeable facing skin;

    a further perforate sound permeable skin, said perforate facing skin overlying said further perforate skin; and

    said perforate facing skin and said further perforate skin being relatively movable with respect to each other in a contact or non-contact sliding sense to vary said acoustic impedance to suit the changing flow and noise conditions in said duct.

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