Three-dimensional cavity resonance pulsating pressure and aerodynamic noise inhibition device

A technology of pulsating pressure and aerodynamic noise, applied in the field of electromechanical devices, can solve the problems of sensitive flow conditions and affecting the effect of action, and achieve the effects of fast response speed, simple structure and high reliability

Inactive Publication Date: 2008-09-17
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

Its shortcoming is that it is more sensitive to the flow conditions, and the change of the flow state of the incoming flow will affect its effect.

Method used

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  • Three-dimensional cavity resonance pulsating pressure and aerodynamic noise inhibition device

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Embodiment Construction

[0016] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0017] Such as figure 1 As shown, this embodiment includes: an array groove 1, an actuating reed 2, a piezoelectric ceramic sheet 3, a dedicated high-voltage power supply 4 for piezoelectric ceramics, a computer 5 equipped with an A / D acquisition card, a dynamic pressure sensor 6 and Mounting seat 7. The arrayed grooves 1 are distributed on the plane of the incoming flow direction of the cavity. One end of the actuating reed 2 is fixed on the mounting base 7, and the other end can vibrate freely. The upper surface of the actuating reed 2 is flush with the cavity surface in the in...

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Abstract

The invention relates to a fluctuating pressure and pneumatic noise suppression device for three-dimensional cavity resonates, belonging to flow control technical field, comprising an aligned array groove, an actuating reed, a piezoelectric ceramic piece, an installing seat, a special high voltage power supply for piezoelectric ceramic, a dynamic pressure transducer and a computer with an A / D acquisition card. The dynamic pressure transducer is arranged under the cavity, and is connected with the computer with A / D acquisition card by the through hole under the cavity. The actuating reed is arranged in the aligned array groove. The piezoelectric ceramic piece is pasted on the bottom of the reed to be the excitation element. The piezoelectric ceramic piece is connected with the special high voltage power supply for piezoelectric ceramic. The piezoelectric ceramic piece produces extensional deformation under the control signal excitation, and drives the actuating reed to vibrate, the oscillation frequency of the shear layer is changed, the cavity resonates is broken down, and the cavity pneumatic noise is suppressed. The fluctuating pressure and pneumatic noise suppression device for three-dimensional cavity resonates has the advantages of wide adjustable range, realizing the accurate control of the phased array for the three-dimensional space of the cavity by the real time feedback of the fluctuating pressure of cavity.

Description

technical field [0001] The invention relates to an electromechanical device in the technical field of vibration and noise engineering, in particular to a device for suppressing three-dimensional cavity pulsating pressure and aerodynamic noise by using a distributed piezoelectric actuator. Background technique [0002] When the high-speed fluid flows through the cavity structure, due to the interaction between the shear layer at the mouth of the cavity and the flow in the cavity, a strong self-sustained oscillation phenomenon may occur, resulting in severe pressure, velocity and other pulsations, that is, the cavity self-sustained oscillation, and thus radiate Make a strong noise. Under the action of high-speed airflow, the cavity formed by the weapon compartment and ammunition compartment of a fighter jet will have a pulsating pressure level of more than 180dB; when the aircraft takes off and lands, the noise caused by the pulsating pressure of the landing gear compartment h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C21/08B64C21/02
Inventor 朱幼君欧阳华杜朝辉竺晓程田杰
Owner SHANGHAI JIAO TONG UNIV
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