CN114088333A

CN114088333A - Surface acoustic load measurement calibrating device

Info

Publication number: CN114088333A
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: 2022-02-25
Anticipated expiration: 2041-11-19
Also published as: CN114088333B

Abstract

The invention aims to provide a surface acoustic load measurement calibration device, which can send out stable noise signals with fixed frequency and strength and is used for calibrating an acoustic sensor in a pneumatic noise wind tunnel test. Including sound production mechanism and reverberation chamber, the reverberation chamber be a tubular metal resonator, the one end of tubular metal resonator is for taking place the end, the other one end of tubular metal resonator is the check and survey end, sound production mechanism's bee calling organ be located the emergence end of tubular metal resonator, its sound production direction is towards the check and survey end of tubular metal resonator, the check and survey end is installed the sealing rubber circle, the inner wall of tubular metal resonator is the protruding structure of non-smoothness. The method can effectively reflect sound waves, simultaneously isolate external noise interference, ensure that an ideal calibration sound field environment is formed in a reverberation cavity, has the advantages of stable noise signals and no external interference, and simultaneously realizes the advantage of convenient online calibration of the surface microphone.

Description

Surface acoustic load measurement calibrating device

Technical Field

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

Background

In recent years, with the rise of research on aerodynamic noise wind tunnel tests of aircrafts, the requirement for calibrating surface acoustic load test sensors is gradually increased. Currently, existing calibration devices are designed for individual acoustic sensors and are independently calibrated before installation and use. When the surface microphone is embedded and installed on the model, an efficient calibration and measurement means is not available, and whether the sensor is in a normal state after installation cannot be evaluated. Therefore, in order to improve the reliability of the test data of the wind tunnel test, an on-line calibration device capable of calibrating the sensor mounted on the model needs to be designed.

Disclosure of Invention

Based on the defects, the invention aims to provide the surface acoustic load measurement calibration device, and the test device can send out stable noise signals with fixed frequency and strength and is used for calibrating the acoustic sensor for the pneumatic noise wind tunnel test.

The technical scheme adopted by the invention is as follows: the utility model provides a calibrating device is measured to surface acoustic load, includes sound production mechanism and reverberation chamber, the reverberation chamber be a tubular metal resonator, the one end of tubular metal resonator is for taking place the end, the other one end of tubular metal resonator is the school and surveys the end, sound production mechanism's bee calling organ be located the emergence end of tubular metal resonator, its sound production direction is towards the school of tubular metal resonator and surveys the end, sealed rubber circle is installed to the school and surveys the end, the inner wall of tubular metal resonator is the protruding structure of non-smoothness.

Furthermore, a plurality of rhombic bulges are arranged on the inner wall of the metal pipe at certain intervals along the axial direction of the metal pipe.

Furthermore, the inner diameter of the metal pipe is 30mm, and the length of the metal pipe is 50 mm.

Furthermore, sounding mechanism include bee calling organ, switch, stabiliser and power, bee calling organ, switch, stabiliser and power signal connection in proper order, bee calling organ embedding is in the emergence end of tubular metal resonator.

Further, the buzzer outputs a 1000Hz audio signal.

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

The invention has the advantages and beneficial effects that: the method can effectively reflect sound waves, simultaneously isolate external noise interference, ensure that an ideal calibration sound field environment is formed in the reverberation cavity, has the advantages of stable noise signals and no external interference, and simultaneously realizes the advantage of convenient 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 an enlarged view of a portion of the reverberation chamber of the calibration device of the present invention;

the device comprises an insulating handle shell, a reverberation cavity metal tube, a sealing rubber ring, a buzzer, a voltage stabilizer, a battery, a power switch, a model surface, a microphone to be calibrated, a power switch, a model surface and a sealing rubber ring, wherein the reverberation cavity metal tube comprises 1 the insulating handle shell, 2 the reverberation cavity metal tube, 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 the microphone to be calibrated.

Detailed Description

The invention is further illustrated by way of example in the accompanying drawings of the specification:

example 1

A 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 in electrical signal connection, the power supply is provided through a battery, stable voltage input is provided for the buzzer through the voltage stabilizer, and the purpose that the buzzer sends sound waves with fixed frequency and fixed sound pressure level as input signals for sensor calibration is achieved; the reverberation chamber be a tubular metal resonator, the one end of tubular metal resonator is for giving out the end, the other end of tubular metal resonator is the check end, bee calling organ embedding is in the emergence end of tubular metal resonator, its sound production direction is towards the check end of tubular metal resonator, the check end is installed the sealing rubber circle, use to wait to check the sensor as the center, check and survey the end buckle cover on the model surface, form airtight reverberation chamber, effectively separate external noise interference simultaneously, provide ideal environment for the check and survey of sensor, the inner wall of tubular metal resonator is provided with a plurality of rhombus archs according to its axial with certain interval, make intracavity sound field reverberation sound field more even, the design size of tubular metal resonator and inner wall arch have effectively avoided the check sound wave to form at the standing wave, and the metal material absorptivity is low. The inner diameter of the metal pipe is 30mm, and the length of the metal pipe is 50 mm. The buzzer outputs a 1000Hz audio signal. After the sound pressure level is calibrated and measured by the standard sensor, the reverberation cavity is tightly attached to the surface of a model around the sensor to form a closed acoustic reverberation space, and the online calibration of the surface sensor can be conveniently and quickly completed by a comparison method.

The embodiment realizes that the sound wave emitted by the buzzer is transmitted to the sensor in the sealed space, and simultaneously isolates the influence of external noise to form an ideal calibration and measurement environment.

In addition, the installation and combination of the sound production mechanism parts and the reverberation cavity can be realized by using the holding handle, the holding handle can be held by a user with one hand, the power switch is arranged on the surface of the handle, the use of the calibration device is convenient, and the online calibration of the surface microphone is realized in a convenient mode.

Claims

1. A surface acoustic load measurement calibration device, comprising a sound production mechanism and a reverberation chamber, characterized in that: the reverberation chamber be a tubular metal resonator, the one end of tubular metal resonator is for taking place the end, the other one end of tubular metal resonator is the check end, the buzzer of sound generating mechanism be located the emergence end of tubular metal resonator, its sound production direction is towards the check end of tubular metal resonator, the check end is installed the sealing rubber circle, the inner wall of tubular metal resonator is the unsmooth protruding structure.

2. A surface acoustic load measurement calibration device according to claim 1, wherein: the inner wall of the metal pipe is provided with a plurality of diamond-shaped bulges at certain intervals along the axial direction.

3. A surface acoustic load measurement calibration device according to claim 2, wherein: the inner diameter of the metal pipe is 30mm, and the length of the metal pipe is 50 mm.

4. A surface acoustic load measurement calibration device according to claim 3, wherein: the sounding mechanism 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, and the buzzer is embedded into the generating end of the metal tube.

5. A surface acoustic load measurement calibration device according to any of claims 1-4, characterized in that: the buzzer outputs 1000Hz audio signals.

6. A surface acoustic load measurement calibration device according to claim 5, wherein: the sounding mechanism is arranged in the handle-shaped shell.