MULTI-FUNCTION SYNTHETIC JET AND METHOD OF MANUFACTURING SAME

• US 20140049970A1
• Filed: 08/15/2012
• Published: 02/20/2014
• Est. Priority Date: 08/15/2012
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: Hendrik Pieter Jacobus De Bock
• Inventors: de Bock, Hendrik Pieter Jacobus, Wetzel, Todd Garrett, Vogel, John Anthony
• Granted Patent: US 9,215,520 B2
• Time in Patent Office: Days
• US Class Current: 362/373
• CPC Class Codes: B05B 17/0653 Details
• CPC Class Codes: G10K 11/178 by electro-acoustically regenerating the original acoustic waves in anti-phase
• CPC Class Codes: G10K 2210/3212 Actuator details, e.g. composition or microstructure
• CPC Class Codes: G10K 9/121 Flextensional transducers
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H04R 1/08 Mouthpieces; Microphones; Attachments therefor
• CPC Class Codes: H04R 1/403 loud-speakers
• CPC Class Codes: H04R 17/00 Piezoelectric transducers; Electrostrictive transducers piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners H10N30/00
• CPC Class Codes: H05K 7/20172 Fan mounting or fan specifications
• CPC Class Codes: H10N 30/204 using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
• CPC Class Codes: H10N 30/2042 Cantilevers, i.e. having one fixed end
• CPC Class Codes: H10N 30/802 Circuitry or processes for operating piezoelectric or electrostrictive devices not otherwise provided for, e.g. drive circuits
• CPC Class Codes: Y10T 29/49169 Assembling electrical component directly to terminal or elongated conductor
• CPC Class Codes: Y10T 29/494 Fluidic or fluid actuated device making

Abstract

A synthetic jet assembly includes a synthetic jet having a cavity and an opening formed therein. The synthetic jet assembly also includes an actuator element coupled to a second surface of the body to selectively cause displacement of the second surface, and a control unit electrically coupled to the actuator element. The control unit is configured to transmit a multi-frequency drive signal to the actuator element, the multi-frequency drive signal comprising a cooling frequency component and an acoustic frequency component superimposed on the cooling frequency component. The cooling frequency component causes a cooling jet to eject from the opening of the body. The acoustic frequency component produces a desired audible output.

Claims

1. A synthetic jet assembly comprising:

a synthetic jet comprising;

a body having a cavity and an opening formed therein;

an actuator element coupled to a second surface of the body to selectively cause displacement of the second surface; and

a control unit electrically coupled to the actuator element, the control unit configured to transmit a multi-frequency drive signal to the actuator element, the multi-frequency drive signal comprising a cooling frequency component and an acoustic frequency component superimposed on the cooling frequency component;

wherein the cooling frequency component causes a cooling jet to eject from the opening of the body; and

wherein the acoustic frequency component produces a desired audible output.

3. The synthetic jet assembly of claim 1 wherein the cooling frequency component is less than approximately 400 Hz.

4. The synthetic jet assembly of claim 1 wherein the cooling frequency component is greater than approximately 20,000 Hz.

5. The synthetic jet assembly of claim 1 wherein the acoustic frequency component comprises at least one frequency in a range of approximately 500-20,000 Hz.

6. The synthetic jet assembly of claim 1 wherein the acoustic frequency component generates an audible alert.

7. The synthetic jet assembly of claim 1 wherein the acoustic frequency component generates a verbal message.

8. The synthetic jet assembly of claim 1 wherein the acoustic frequency component is approximately 180 degrees out of phase of a frequency of a known ambient noise condition.

9. The synthetic jet assembly of claim 1 wherein the control unit is further configured to:

receive an output from a microphone indicative of an ambient noise condition;

apply a digital signal processing (DSP) algorithm to determine a noise-cancelling frequency, the noise-cancelling frequency having a frequency and phase configured to cancel the ambient noise condition; and

transmit the acoustic frequency component of the multi-frequency drive signal at the noise-cancelling frequency.

10. The synthetic jet assembly of claim 1 wherein the body of the synthetic jet comprises at least one flexible plate;

and

wherein the actuator element is coupled to the at least one flexible plate.

2. The synthetic jet assembly of claim l wherein the cooling frequency component comprises a frequency that is undetectable by a human ear.

11. A method of manufacturing a synthetic jet assembly comprising:

providing a synthetic jet body that encircles a volume;

forming an orifice in the synthetic jet body to fluidically couple the volume to a gas outside the volume;

coupling an actuator element to a flexible surface of the synthetic jet body; and

electronically coupling a controller assembly to the actuator element, wherein the controller assembly is programmed to;

generate a first drive signal comprising an inaudible frequency component that causes a cooling jet to expel from the orifice;

generate a second drive signal comprising an audible frequency component that generates a desired acoustic output;

combine the first and second drive signals to form a combined drive signal; and

transmit the combined drive signal to the actuator element.

12. The method of claim 11 further comprising:

detecting an ambient noise;

identifying a noise-cancelling frequency to cancel the ambient noise; and

generating the second drive signal at the noise-cancelling frequency.

13. The method of claim 11 further comprising generating the second drive signal to produce at least one of a server message, and alarm, and a verbal announcement.

14. The method of claim 11 further comprising generating the first frequency component in a range of approximately 10-400 Hz.

15. The method of claim 11 further comprising generating the second frequency component in a range of approximately 500-4,000 Hz.

16. An electronic apparatus comprising:

a synthetic jet comprising;

a housing having an orifice formed therein for introducing a fluid from outside the housing into a cavity of the housing and expelling a cooling jet therefrom; and

a piezoelectric actuator coupled to the housing;

a drive unit configured to drive the piezoelectric actuator;

a control unit configured to transmit a multi-frequency drive signal to the drive unit;

an electronic component configured to be cooled by the cooling jet; and

wherein the multi-frequency drive signal comprises a cooling frequency component selected to generate the cooling jet and an acoustic frequency component selected to generate an audible acoustic output.

17. The electronic apparatus of claim 16 wherein the cooling frequency component is less than approximately 400 Hz.

18. The electronic apparatus of claim 16 wherein the acoustic frequency component is greater than approximately 500 Hz.

19. The electronic apparatus of claim 16 wherein the control unit is programmed to operate according to a noise-cancelling mode.

20. The electronic apparatus of claim 16 wherein the control unit is programmed to operate according to an audio-output mode.

21. The electronic apparatus of claim 16 wherein the electronic component comprises a light emitting diode.

22. The electronic apparatus of claim 16 wherein the drive unit is directly coupled to a surface of the synthetic jet.