Active noise control using an array of plate radiators and acoustic resonators
First Claim
1. An active noise control subassembly array for reducing source noise caused by a source independent of said array, said array comprising:
- a) a pair of active noise control subassemblies each including;
1) a piezoceramic-driven noise radiating panel bendably vibratable to generate a panel noise canceling at least a portion of the source noise and having a panel resonating frequency;
2) a front plate spaced apart from said panel, disposed generally between said source noise and said panel, and having a sound exit port;
3) a first pair of spaced-apart side walls each generally abutting said panel and said front plate so as to generally enclose a front cavity to define a resonator having a resonator resonating frequency;
4) a back plate spaced apart from said panel with said panel disposed generally between said source noise and said back plate; and
5) a second pair of spaced-apart side walls each generally abutting said panel and said back plate so as to generally enclose a back cavity, wherein said pair of subassemblies are spaced apart to create a space between adjacent side walls of said pair of subassemblies; and
b) a third active noise control subassembly including;
1) a piezoceramic-driven noise radiating sheet bendably vibratable to generate a sheet noise canceling at least a portion of the source noise and having a sheet resonating frequency, said sheet spaced apart from said back plates of said pair of subassemblies; and
2) a third pair of spaced-apart side walls each generally abutting said sheet and a corresponding back plate of said pair of subassemblies so as to generally enclose a foreground cavity to define a resonator having a resonator resonating frequency and with said space defining a sound exit port.
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Accused Products
Abstract
An active noise control subassembly array for reducing noise caused by a source (such as an aircraft engine). A pair of subassemblies each has a piezoceramic-driven noise radiating panel to generate a panel noise canceling at least some of the source noise. A front plate is spaced apart from the panel and has a sound exit port. A first pair of spaced-apart side walls each generally abuts the panel and the front plate so as to generally enclose a front cavity to define a resonator. A back plate is spaced apart from the panel by a second pair of side walls. The pair of subassemblies are spaced apart to create a space between their adjacent side walls. A third subassembly is similar to the pair of subassemblies but may have a different resonant frequency and is positioned such that the back plates of the subassembly pair serve as the front plate of the third subassembly with the space between the subassembly pair serving as the sound exit port of the third subassembly.
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Citations
10 Claims
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1. An active noise control subassembly array for reducing source noise caused by a source independent of said array, said array comprising:
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a) a pair of active noise control subassemblies each including; 1) a piezoceramic-driven noise radiating panel bendably vibratable to generate a panel noise canceling at least a portion of the source noise and having a panel resonating frequency; 2) a front plate spaced apart from said panel, disposed generally between said source noise and said panel, and having a sound exit port; 3) a first pair of spaced-apart side walls each generally abutting said panel and said front plate so as to generally enclose a front cavity to define a resonator having a resonator resonating frequency; 4) a back plate spaced apart from said panel with said panel disposed generally between said source noise and said back plate; and 5) a second pair of spaced-apart side walls each generally abutting said panel and said back plate so as to generally enclose a back cavity, wherein said pair of subassemblies are spaced apart to create a space between adjacent side walls of said pair of subassemblies; and b) a third active noise control subassembly including; 1) a piezoceramic-driven noise radiating sheet bendably vibratable to generate a sheet noise canceling at least a portion of the source noise and having a sheet resonating frequency, said sheet spaced apart from said back plates of said pair of subassemblies; and 2) a third pair of spaced-apart side walls each generally abutting said sheet and a corresponding back plate of said pair of subassemblies so as to generally enclose a foreground cavity to define a resonator having a resonator resonating frequency and with said space defining a sound exit port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification