CN114088333B

CN114088333B - Surface acoustic load measurement and calibration device

Info

Publication number: CN114088333B
Application number: CN202111374103.0A
Authority: CN
Inventors: 丁存伟; 周国成; 陈宝; 李元首; 王玉琢
Original assignee: AVIC Aerodynamics Research Institute
Current assignee: AVIC Aerodynamics Research Institute
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2023-07-14
Anticipated expiration: 2041-11-19
Also published as: CN114088333A

Abstract

The invention aims to provide a surface acoustic load measurement calibration device which can emit stable noise signals with fixed frequency and intensity and is used for calibrating an acoustic sensor for a pneumatic noise wind tunnel test. Including sound production mechanism and reverberation chamber, reverberation chamber be a tubular metal resonator, the one end of tubular metal resonator is the generating end, the other end of tubular metal resonator is the school and surveys the end, sound production mechanism's buzzer be located the generating end of tubular metal resonator, its sound production direction is towards the school of tubular metal resonator and surveys the end, school surveys the end and installs sealing rubber circle, the inner wall of tubular metal resonator is the unsmooth protruding structure. The surface microphone has the advantages of effectively reflecting sound waves, isolating external noise interference, ensuring that an ideal sound field calibrating environment is formed in the reverberation cavity, having stable noise signals and being free from external interference, and realizing convenient and fast online calibration of the surface microphone.

Description

Surface acoustic load measurement and calibration device

Technical Field

The invention belongs to the field of aircraft wind tunnel tests, and particularly relates to a surface acoustic load measurement and calibration device.

Background

In recent years, with the rise of the research of aerodynamic noise wind tunnel test of an aircraft, the requirement for calibrating a surface acoustic load test sensor is also increasing. The existing calibration devices are aimed at individual acoustic sensors and are independently calibrated before being installed and used. After the surface microphone is embedded on the model, an efficient calibrating means is not available, and whether the sensor is in a normal state after the surface microphone is installed cannot be estimated. Therefore, in order to improve the reliability of the test data of the wind tunnel test, it is necessary to design an on-line calibration device capable of calibrating the sensor mounted on the model.

Disclosure of Invention

Based on the above shortcomings, the invention aims to provide a surface acoustic load measurement calibration device which can send stable noise signals with fixed frequency and intensity and is used for calibrating an acoustic sensor for an aerodynamic noise wind tunnel test.

The technical scheme adopted by the invention is as follows: the utility model provides a surface acoustic load measurement calibrating device, includes sound production mechanism and reverberation chamber, reverberation chamber be a tubular metal resonator, the one end of tubular metal resonator is the generating end, the other end of tubular metal resonator is the school and surveys the end, sound production mechanism's buzzer be located the generating end of tubular metal resonator, its sound production direction is towards the school of tubular metal resonator and surveys the end, school surveys the end and installs sealing rubber circle, the inner wall of tubular metal resonator is non-smooth protruding structure.

Further, a plurality of diamond-shaped bulges are arranged on the inner wall of the metal tube at certain intervals along the axial direction of the metal tube.

Further, the inner diameter of the metal tube is 30mm, and the length of the metal tube is 50mm.

Further, the sounding mechanism comprises a buzzer, a power switch, a voltage stabilizer and a power supply, wherein the buzzer, the power switch, the voltage stabilizer and the power supply are connected through electric signals in sequence, and the buzzer is embedded in the generating end of the metal tube.

Further, the buzzer outputs a 1000Hz audio signal.

Further, the sounding mechanism is arranged in the handle-shaped shell.

The invention has the advantages and beneficial effects that: the surface microphone has the advantages of effectively reflecting sound waves, isolating external noise interference, ensuring that an ideal sound field calibrating environment is formed in the reverberation cavity, having stable noise signals and being free from external interference, and realizing convenient and fast online calibration of the surface microphone.

Drawings

FIG. 1 is a schematic diagram of a calibration device according to the present invention;

FIG. 2 is a partial enlarged view of the reverberant cavity of the calibration apparatus of the present invention;

the microphone comprises a shell, an insulating handle, a metal pipe, a sealing rubber ring, a buzzer, a voltage stabilizer, a battery, a power switch, a model surface and a microphone to be calibrated, wherein the shell is 1, the shell of the insulating handle, 2, the metal pipe of the reverberation cavity, 3, the sealing rubber ring, 4, the buzzer, 5, the voltage stabilizer, 6, the battery, 7, the power switch, 8, the model surface and 9.

Detailed Description

The invention is further illustrated by the following examples according to the drawings of the specification:

example 1

The surface acoustic load measurement calibration device comprises a sounding mechanism and a reverberation cavity, wherein the sounding mechanism is arranged in a handle-shaped shell and comprises a buzzer, a power switch, a voltage stabilizer and a power supply, the buzzer, the power switch, the voltage stabilizer and the power supply are sequentially connected through electric signals, the power supply is provided through a battery, stable voltage input is provided for the buzzer through the voltage stabilizer, and the buzzer emits sound waves with fixed frequency and fixed sound pressure level to serve as input signals for sensor calibration; the reverberant cavity be a metal pipe, the one end of metal pipe is the generating end, the other end of metal pipe is the school and surveys the end, buzzer embedding is in the generating end of metal pipe, its sound production direction is towards the school of metal pipe survey the end, the school is surveyed the end and is installed sealing rubber circle, with waiting to proofread the sensor as the center, school survey end knot covers on the model surface, form airtight reverberant cavity, effectively separate simultaneously and be external noise interference, ideal environment has been provided for the school of sensor, the inner wall of metal pipe is provided with a plurality of diamond protruding according to its axial with certain interval, make intracavity sound field reverberation sound field more even, the design size of metal pipe and inner wall arch have effectively avoided proofreading the sound wave to form standing wave at the pipe, and the metal material absorptivity is low. The inner diameter of the metal tube is 30mm, and the length is 50mm. The buzzer outputs a 1000Hz audio signal. After the sound pressure level is calibrated by the standard sensor, the reverberation cavity is tightly attached to the surface of the model around the sensor to form a sealed acoustic reverberation space, and the on-line calibration of the surface sensor can be conveniently and rapidly completed by a comparison method.

The embodiment realizes that sound waves emitted by the buzzer are transmitted to the sensor in the sealed space, and meanwhile, the influence of external noise is isolated, so that an ideal calibration environment is formed.

In addition, through using the handle of gripping, both can realize the installation and the combination in sounding mechanism spare part and reverberation chamber, can supply the user to hold again with one hand, handle surface mounting has switch, the use of the calibrating device of being convenient for to the online calibration of surface microphone has been realized to a convenient mode.

Claims

1. The utility model provides a surface acoustic load measures calibrating device, includes sound generating mechanism and reverberation chamber, its characterized in that: the sound producing device comprises a sound producing mechanism, a buzzer, a sealing rubber ring, a metal pipe, a sound producing cavity, a sealing rubber ring and a sealing rubber ring, wherein the sound producing cavity is a metal pipe; the inner wall of the metal tube is provided with a plurality of diamond-shaped bulges at certain intervals along the axial direction of the metal tube; the inner diameter of the metal tube is 30mm, and the length of the metal tube is 50mm; the sounding mechanism comprises a buzzer, a power switch, a voltage stabilizer and a power supply, wherein the buzzer, the power switch, the voltage stabilizer and the power supply are sequentially connected through electric signals, and the buzzer is embedded in the generating end of the metal tube; the buzzer outputs a 1000Hz audio signal; the sounding mechanism is arranged in the handle-shaped shell.