Active control system and method for reducing engine noise and vibration

• US 4,808,863 A
• Filed: 07/15/1987
• Issued: 02/28/1989
• Est. Priority Date: 07/15/1987
• Status: Expired due to Fees

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Andersson, Anders O.
• Primary Examiner(s): Salce, Patrick R.
• Assistant Examiner(s): Rebsch, D. L.
• Application Number:
  US07/073,617
• Time in Patent Office: 594 Days
• Field of Search: 180/300, 180/312, 188/267, 188/299, 248/550, 310/51, 310/91, 318/114, 318/460, 318/605, 318/629
• US Class Current: 310/51
• CPC Class Codes: F16F 15/03 using magnetic or electromagnetic means F16F9/53, F16F15/005 take precedence
• CPC Class Codes: G05D 19/02 characterised by the use of electric means
• CPC Class Codes: H02K 33/00 Motors with reciprocating, oscillating or vibrating magnet, armature or coil system arrangements for handling mechanical energy structurally associated with motors H02K7/00, e.g. H02K7/06

Abstract

Noise and vibration in a structure is reduced through application to the structure of an oscillatory torque. An electromechanical energy converter provides the oscillatory torque when the input signal to the electromechanical energy converter has a frequency and harmonics thereof required to counteract the noise and vibration desired to be attenuated.

Claims

1. A system for generating vibratory energy comprising in combination:

an electrical amplifier for driving a rotary machine comprising a disk;

a plurality of magnetic brake shoes coupled to said disk;

means including an electromechanical amplifier for reducing the size and weight of said electrical amplifier driving said rotary machine;

said electrical amplifier coupled to said plurality of magnetic brake shoes for providing a modulated current through said plurality of magnetic brake shows thereby producing eddy currents in said disk; and

,

magnetic brake shoe force gauge means for providing feedback input to regulate the control current passing through said plurality of magnetic brake shoes to produce a required torque.