Piezoelectric actuators optimized for synthetic jet actuators
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B05B-001/08
F15D-001/00
H01L-041/22
F04B-043/04
출원번호
US-0712510
(2015-05-14)
등록번호
US-9803666
(2017-10-31)
발명자
/ 주소
Whalen, Edward A.
Griffin, Steven F.
van Schoor, Marthinus Cornelius
Clery, Conor
출원인 / 주소
The Boeing Company
대리인 / 주소
Miller, Matthias & Hull LLP
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
A synthetic jet actuator and a method for optimizing a synthetic jet actuator to meet operating requirements and physical constraints may include estimating dimension and a resonance frequency of an air cavity of the synthetic jet actuator, and using the estimated resonance frequency to the estimate
A synthetic jet actuator and a method for optimizing a synthetic jet actuator to meet operating requirements and physical constraints may include estimating dimension and a resonance frequency of an air cavity of the synthetic jet actuator, and using the estimated resonance frequency to the estimate dimensions of a piezoelectric actuator of the synthetic jet actuator. Individual simulations of the air cavity and piezoelectric actuator, and a coupled simulation may be performed using the estimated dimensions, and the dimensions may be revised and simulations re-executed to match the resonance frequencies of the air chamber and the piezoelectric actuator. The method maybe yield a synthetic jet actuator having a resonance frequency of the piezoelectric actuator that is approximately equal to a quarter-wavelength resonance frequency of the air cavity.
대표청구항▼
1. A method for optimizing a synthetic jet actuator to meet operating requirements and physical constraints on a design of the synthetic jet actuator, the synthetic jet actuator having an air cavity having a cylindrical shape with a cavity diameter and a cavity height, and an orifice, the synthetic
1. A method for optimizing a synthetic jet actuator to meet operating requirements and physical constraints on a design of the synthetic jet actuator, the synthetic jet actuator having an air cavity having a cylindrical shape with a cavity diameter and a cavity height, and an orifice, the synthetic jet actuator further including a piezoelectric actuator that is actuated to alternately increase and decrease a cavity volume of the air cavity to draw air into and expel the air from the air cavity, respectively, through the orifice, the method for optimizing comprising: calculating a resonance frequency for the air cavity based on an estimated cavity diameter for the air cavity;performing a coupled simulation of the air cavity of the synthetic jet actuator with the piezoelectric actuator using estimated air cavity dimensions and estimated piezoelectric actuator dimensions;comparing simulation output data from the coupled simulation of the air cavity and the piezoelectric actuator to the operating requirements for the synthetic jet actuator; andadjusting at least one of the estimated air cavity dimensions and the estimated piezoelectric actuator dimensions in response to determining that the simulation output data from the coupled simulation does not meet at least one of the operating requirements for the synthetic jet actuator. 2. The method for optimizing a synthetic jet actuator of claim 1, wherein calculating the resonance frequency for the air cavity comprises solving a quarter-wavelength resonance frequency equation: fc=ν/4dc where fc is a quarter-wavelength resonance frequency for a tube that is closed at one end, ν is a speed of sound in a gas, and dc is the estimated cavity diameter for the air cavity. 3. The method for optimizing a synthetic jet actuator of claim 1, wherein calculating the resonance frequency for the air cavity comprises creating a coarse finite element model of the air cavity with maximum pressure conditions at all structural boundaries and minimum pressure conditions at all orifices. 4. The method for optimizing a synthetic jet actuator of claim 1, comprising performing a structural simulation of the piezoelectric actuator using the estimated piezoelectric actuator dimensions and performing a fluid and acoustic simulation of the air cavity of the synthetic jet actuator using the estimated air cavity dimensions before performing the coupled simulation of the air cavity of the synthetic jet actuator with the piezoelectric actuator. 5. The method for optimizing a synthetic jet actuator of claim 1, wherein comparing the simulation output data from the coupled simulation to the operating requirements for the synthetic jet actuator comprises comparing a simulation maximum output momentum of air output through the orifice from the coupled simulation is at least equal to a required maximum output momentum of the operating requirements;wherein adjusting at least one of the estimated air cavity dimensions and the estimated piezoelectric actuator dimensions comprises adjusting at least one of an orifice length, an orifice width and an orifice neck length of the orifice to increase the simulation maximum output momentum in response to determining that the simulation maximum output momentum is less than the required maximum output momentum; andwherein the method for optimizing comprises re-performing the coupled simulation of the air cavity of the synthetic jet actuator with the piezoelectric actuator after adjusting at least one of the orifice length, the orifice width and the orifice neck length. 6. The method for optimizing a synthetic jet actuator of claim 5, comprising: determining whether at least one of the orifice length, the orifice width and the orifice neck length may be adjusted to increase the simulation maximum output momentum, wherein adjusting at least one of the estimated air cavity dimensions and the estimated piezoelectric actuator dimensions comprises adjusting the cavity diameter of the air cavity to increase the simulation maximum output momentum in response to determining that the orifice length, the orifice width and the orifice neck length may not be adjusted to increase the simulation maximum output momentum; andrecalculation the resonance frequency after adjusting the cavity diameter of the air cavity in response to determining that the orifice length, the orifice width and the orifice neck length may not be adjusted to increase the simulation maximum output momentum. 7. The method for optimizing a synthetic jet actuator of claim 1, wherein adjusting at least one of the estimated air cavity dimensions and the estimated piezoelectric actuator dimensions comprises adjusting a piezoelectric disk thickness of the piezoelectric actuator in response to determining that a simulation synthetic jet actuator output pressure is less than a required synthetic jet actuator output pressure or that a piezoelectric actuator resonance frequency is not equal to the resonance frequency for the air cavity; andwherein the method for optimizing comprises recalculating the estimated piezoelectric actuator dimensions and re-performing the coupled simulation of the air cavity of the synthetic jet actuator with the piezoelectric actuator after adjusting the piezoelectric disk thickness. 8. The method for optimizing a synthetic jet actuator of claim 1, comprising setting a piezoelectric disk diameter of a piezoelectric disk of the piezoelectric actuator equal to a value within a range of 75% to 90% of the cavity diameter of the air cavity. 9. A method for optimizing a synthetic jet actuator having an air cavity having a cylindrical shape with a cavity diameter and a cavity height, and an orifice, the synthetic jet actuator further including a piezoelectric actuator that is actuated to alternately increase and decrease a cavity volume of the air cavity to draw air into and expel the air from the air cavity, respectively, through the orifice, the method for optimizing comprising: determining operating requirements for the synthetic jet actuator;determining physical constraints on a design of the synthetic jet actuator based on an operating environment for the synthetic jet actuator;determining estimated synthetic jet actuator dimensions for the synthetic jet actuator based on the operating requirements and the physical constraints;calculating a resonance frequency for the air cavity based on an estimated cavity diameter for the air cavity;calculating estimated piezoelectric actuator dimensions for the piezoelectric actuator based on the estimated synthetic jet actuator dimensions and the resonance frequency;performing simulations of the air cavity of the synthetic jet actuator and the piezoelectric actuator using the estimated synthetic jet actuator dimensions and estimated piezoelectric actuator dimensions;comparing simulation output data from the simulations of the air cavity and the piezoelectric actuator to the operating requirements for the synthetic jet actuator; andadjusting at least one of the estimated synthetic jet actuator dimensions and the estimated piezoelectric actuator dimensions in response to determining that the simulation output data from the simulations does not meet at least one of the operating requirements for the synthetic jet actuator. 10. The method for optimizing a synthetic jet actuator of claim 9, wherein calculating the resonance frequency for the air cavity comprises solving a quarter-wavelength resonance frequency equation: fc=ν/4dc where fc is a quarter-wavelength resonance frequency for a tube that is closed at one end, ν is a speed of sound in a gas, and dc is the estimated cavity diameter for the air cavity. 11. The method for optimizing a synthetic jet actuator of claim 9, wherein determining the estimated synthetic jet actuator dimensions for the synthetic jet actuator comprises setting an estimated cavity height equal to a value within a range of 0.15% to 0.25% of the estimated cavity diameter. 12. The method for optimizing a synthetic jet actuator of claim 9, wherein determining the estimated piezoelectric actuator dimensions for the piezoelectric actuator comprises setting an estimated piezoelectric disk diameter equal to a value within a range of 75%-90% of the estimated cavity diameter. 13. The method for optimizing a synthetic jet actuator of claim 9, wherein determining the estimated piezoelectric actuator dimensions for the piezoelectric actuator comprises setting an estimated piezoelectric disk diameter equal to approximately 82.5% of the estimated cavity diameter. 14. The method for optimizing a synthetic jet actuator of claim 9, wherein determining the estimated piezoelectric actuator dimensions for the piezoelectric actuator comprises setting an estimated piezoelectric actuator thickness equal to a value within a range of 1.0%-2.5% of the estimated cavity diameter. 15. The method for optimizing a synthetic jet actuator of claim 9, wherein performing the simulations of the air cavity of the synthetic jet actuator and the piezoelectric actuator comprises: performing a structural simulation of the piezoelectric actuator using the estimated piezoelectric actuator dimensions;performing a fluid and acoustic simulation of the air cavity of the synthetic jet actuator using the estimated synthetic jet actuator dimensions; andperforming a coupled simulation of the air cavity of the synthetic jet actuator with the piezoelectric actuator using estimated air cavity dimensions and the estimated piezoelectric actuator dimensions. 16. A method for optimizing an aerodynamic efficiency of an aircraft having airflow over an aerodynamic surface of the aircraft using active flow control, the method comprising: configuring a first piezoelectric actuator forming a first circular wall of an air cavity of a synthetic jet actuator to have a first actuator resonant frequency that is approximately equal to an air cavity quarter-wavelength resonant frequency of the air cavity, wherein the air cavity has a cylindrical shape with a cavity diameter and a cavity height and the synthetic jet further includes an orifice, wherein the first piezoelectric actuator is actuated to alternately increase and decrease a cavity volume of the air cavity to draw air into and expel a jet of air from the air cavity, respectively, through the orifice;installing the synthetic jet actuator at the aerodynamic surface to blow the jet of air into the airflow over the aerodynamic surface to cause the airflow to flow more smoothly over the aerodynamic surface. 17. The method of claim 16, where the air cavity quarter-wavelength resonance frequency is calculated using equation: fc=ν/4dc where fc is the air cavity quarter-wavelength resonance frequency for a tube that is closed at one end, ν is a speed of sound in a gas, and dc is the cavity diameter for the air cavity. 18. The method of claim 16, comprising: configuring a second piezoelectric actuator forming a second circular wall of the air cavity opposite the first circular wall and the first piezoelectric actuator to have a second actuator resonance frequency that is approximately equal to the air cavity quarter-wavelength resonance frequency, wherein the second piezoelectric actuator is actuated to increase the cavity volume when the first piezoelectric actuator increases the cavity volume and to decrease the cavity volume when the first piezoelectric actuator decreases the cavity volume. 19. The method of claim 16, comprising configuring the first piezoelectric actuator with a membrane having a membrane dimension that is greater than the cavity diameter, and a piezoelectric disk attached to a surface of the membrane and having a piezoelectric disk diameter that is within a range of 75%-90% of the cavity diameter, wherein the piezoelectric disk is actuated to alternately increase and decrease the cavity volume of the air cavity. 20. The method of claim 19, wherein the piezoelectric disk diameter is equal to approximately 82.5% of the cavity diameter.
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이 특허에 인용된 특허 (3)
Pitt, Dale M.; Sexton, Bradley W., Apparatus and method for an improved synthetic jet actuator.
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