Active noise control using noise source having adaptive resonant

Details Active noise control using noise source having adaptive resonant Active noise control using noise source having adaptive resonant

1993-11-01

1995-01-17

Look, Edward K.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

381 71, 244 1N, 3403881, F01D 2500

Patent

active

053821343

ABSTRACT:
A noise source for an aircraft engine active noise cancellation system in which the resonant frequency of a noise radiating element is tuned to permit noise cancellation over a wide range of frequencies. The resonant frequency of the noise radiating element is tuned by a plurality of force transmitting mechanisms which contact the noise radiating element. Each one of the force transmitting mechanisms includes an expandable element and a spring in contact with the noise radiating element so that excitation of the element varies the spring force applied to the noise radiating element. The elements are actuated by a controller which receives input of a signal proportional to displacement of the noise radiating element and a signal corresponding to the blade passage frequency of the engine's fan. In response, the controller determines a control signal which is sent to the elements and causes the spring force applied to the noise radiating element to be varied. The force transmitting mechanisms can be arranged to either produce bending or linear stiffness variations in the noise radiating element.

REFERENCES:
patent: 4044203 (1977-08-01), Swinbanks
patent: 4689821 (1987-08-01), Salikuddin et al.
patent: 4700177 (1987-10-01), Nakashima et al.
patent: 4715559 (1987-12-01), Fuller
patent: 4947356 (1990-08-01), Elliott et al.
patent: 4947434 (1990-08-01), Ito
patent: 5031222 (1991-07-01), Takaya
Elliott et al., "A Multiple Error LMS Algorithm and Its Application to the Active Control of Sound and Vibration," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-35, No. 10, Oct. 1987, pp. 1423-1434.

Affiliated with

Also associated with

Rating

Active noise control using noise source having adaptive resonant does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active noise control using noise source having adaptive resonant, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active noise control using noise source having adaptive resonant will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-743984