Adaptive vibro-acoustic attentuator for launch vehicles
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61F-011/06
H03B-029/00
출원번호
US-0681196
(2001-02-16)
발명자
/ 주소
Lane, Steven A.
Griffin, Steven F.
출원인 / 주소
The United States of America as represented by the Secretary of the Air Force
대리인 / 주소
Skorich James M.
인용정보
피인용 횟수 :
1인용 특허 :
5
초록▼
A lightweight self-contained vibro-acoustic device is disclosed for dissipating low frequency vibration and acoustic energy within the payload fairing of launch vehicles. The device can be mounted on the interior surfaces of a fairing and adaptively tuned to match targeted structural and acoustic dy
A lightweight self-contained vibro-acoustic device is disclosed for dissipating low frequency vibration and acoustic energy within the payload fairing of launch vehicles. The device can be mounted on the interior surfaces of a fairing and adaptively tuned to match targeted structural and acoustic dynamics using electronic feedback loops.
대표청구항▼
1. A stand-alone adaptive vibro-acoustic damper system for a wall-enclosed volume having time-varying acoustic resonance, said system comprised of:a diaphragm matched to the acoustic impedance of said volume;a voice coil attached to said diaphragm;a diaphragm motion sensor attached to said diaphragm
1. A stand-alone adaptive vibro-acoustic damper system for a wall-enclosed volume having time-varying acoustic resonance, said system comprised of:a diaphragm matched to the acoustic impedance of said volume;a voice coil attached to said diaphragm;a diaphragm motion sensor attached to said diaphragm providing a voice coil input signal;a magnet surrounding said voice coil, such that said magnet and said voice coil provide a varying electromotive force for maintaining optimal coupling of said diaphragm to said time-varying acoustic resonance in response to said voice coil input signal;a surround-type support apparatus to support said diaphragm;a battery power supply;a vented case to hold said magnet, voice coil, diaphragm support and battery power supply;a flexible base of variable stiffness attached to and supporting said case and attached to the wall of said enclosed volume;a wall motion sensor attached to said flexible base providing a base input signal responsive to motion of the wall of said enclosed volume;means for varying the stiffness of said flexible base in response to said base input signal; andmeans for varying said voice coil and base input signals such that said time-varying acoustic resonance within said wall-enclosed volume are minimized. 2. The stand-alone adaptive vibro-acoustic damper system of claim 1, wherein said means for varying the stiffness of said flexible base in response to said base input signal includes one or more piezoelectric actuators attached to said base. 3. The stand-alone adaptive vibro-acoustic damper system of claim 1, wherein:said wall-enclosed volume has an acoustic impedance; andsaid diaphragm is treated with a porous material to match said diaphragm to said acoustic impedance. 4. The stand-alone adaptive vibro-acoustic damper system of claim 1, wherein said base stiffness varying means and said means for varying said voice coil and base input signals, are comprised of electronic control circuitry. 5. The stand-alone adaptive vibro-acoustic damper system of claim 4, wherein said electronic control circuitry is electrically connected to said diaphragm motion sensor, wall motion sensor, voice coil and battery power supply. 6. The stand-alone adaptive vibro-acoustic damper system of claim 4, wherein said base stiffness varying means is comprised of a piezoelectric actuator integrated with said flexible base. 7. The stand-alone adaptive vibro-acoustic damper system of claim 6, wherein said electronic control circuitry is electrically connected to said diaphragm motion sensor, wall motion sensor, voice coil, piezoelectric actuator and battery power supply. 8. The stand-alone adaptive vibro-acoustic damper system of claim 4, wherein said vented case also holds said electronic control circuitry. 9. The stand-alone adaptive vibro-acoustic damper system of claim 4, wherein said electronic control circuitry is for filtering measurements by said diaphragm motion sensor and said wall motion sensor to obtain filtered measurements, and for using said filtered measurements to optimize structural and acoustic coupling of said diaphragm to said time-varying acoustic resonance. 10. A adaptive vibro-acoustic damper system for a wall-enclosed volume having a time-varying acoustic resonance and an acoustic impedance, said system comprised of:a diaphragm treated with a porous material to match said diaphragm to said acoustic impedance;a diaphragm motion sensor attached to said diaphragm for providing a voice coil input signal;a voice coil attached to said diaphragm and a magnet surrounding said voice coil, for providing a varying electromotive force for maintaining optimal coupling of said diaphragm to said acoustic resonance in response to said voice coil input signal;a vented case containing and securing said magnet and voice coil, and supporting said diaphragm;a flexible base having a variable stiffness and being attached to said vented case and to a wall of said wall-enclosed volume;said flexible base including a wall motion sensor for providing a base input signal responsive to motion of said wall; andelectronic control circuitry electrically connected to said diaphragm motion sensor, wall motion sensor and voice coil, for varying said stiffness of said flexible base in response to said base input signal, and for varying said voice coil and base input signals to minimize said acoustic resonance. 11. The stand-alone adaptive vibro-acoustic damper system of claim 10, further comprising a piezoelectric actuator integrated with said flexible base for operating in cooperation with said control circuitry to vary said stiffness of said flexible base in response to said base input signal. 12. The stand-alone adaptive vibro-acoustic damper system of claim 11, further comprised of:a battery power supply; whereinsaid electronic control circuitry is electrically connected to the diaphragm motion sensor, wall motion sensor, voice coil, piezoelectric actuator and battery power supply, wherebythe damper system is self-contained. 13. The stand-alone adaptive vibro-acoustic damper system of claim 12, wherein said vented case also contains said electronic control circuitry and said battery power supply. 14. The stand-alone adaptive vibro-acoustic damper system of claim 11, wherein said electronic control circuitry is for generating filtered measurements by filtering measurements made by said diaphragm motion sensor and said wall motion sensor, and for using said filtered measurements to optimize structural and acoustic coupling with said wall-enclosed volume. 15. The stand-alone adaptive vibro-acoustic damper system of claim 10, further comprised of:a battery power supply; whereinsaid electronic control circuitry is electrically connected to the diaphragm motion sensor, wall motion sensor, voice coil and battery power supply, wherebythe damper system is self-contained. 16. The stand-alone adaptive vibro-acoustic damper system of claim 10, wherein said electronic control circuitry is for generating filtered measurements by filtering measurements made by said diaphragm motion sensor and said wall motion sensor, and for using said filtered measurements to optimize structural and acoustic coupling with said wall-enclosed volume. 17. The stand-alone adaptive vibro-acoustic damper system of claim 16, further comprising a piezoelectric actuator integrated with said flexible base for operating in cooperation with said control circuitry to vary said stiffness of said flexible base in response to said base input signal. 18. A self-contained adaptive vibro-acoustic damper system for a wall-enclosed volume having a time-varying acoustic resonance and an acoustic impedance, comprised of:a diaphragm treated with a porous material for matching said diaphragm to said acoustic impedance, said diaphragm including a diaphragm motion sensor attached to said diaphragm for providing an input signal to a voice coil;said voice coil being attached to said diaphragm and being surrounded by a magnet, with said magnet and voice coil interacting and providing a varying electromotive force responsive to said input signal and acting on said diaphragm for maintaining optimal coupling of said diaphragm to said acoustic resonance;a vented case containing said magnet and said voice coil, and supporting said diaphragm;a flexible base having a variable stiffness and including a wall motion sensor;said flexible base being attached to said vented case and also to a wall of said wall-enclosed volume;said wall motion sensor for providing a base input signal responsive to vibration of said wall of said enclosed volume, to electronic control circuitry; andsaid electronic control circuitry being connected to said diaphragm motion sensor, wall motion sensor and voice coil, for varying said stiffness of said flexible base in response to said base input signal, and for varying said voice coil and said base input signals, wherebysaid acoustic resonance is minimized. 19. The self-contain ed adaptive vibro-acoustic damper system of claim 18, further comprised of a piezoelectric actuator integrated with said flexible base for cooperating with said electronic control circuitry to vary said stiffness of said flexible base in response to said base input signal. 20. The self-contained adaptive vibro-acoustic damper system of claim 19, further comprised of:a battery power supply; whereinsaid electronic control circuitry is electrically connected to said diaphragm motion sensor, wall motion sensor, voice coil and battery power, wherebysaid damper system is self-contained.
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