CN116242530A - Dynamic pressure-sensitive paint calibration device and calibration method based on sinusoidal pressure - Google Patents

Abstract

The invention discloses a sinusoidal pressure-based dynamic pressure-sensitive paint calibration device and a calibration method, belonging to the technical field of calibration tests. The invention includes an air inlet, a nozzle, a porous turntable, a pre-press hole, a reset device, a variable-diameter piston, a piston cylinder, a sealing cover, a glass window, an end cover, a laser vibrometer, a pressure-sensitive paint pattern, a transmission belt, and a glass window , Pressure-sensitive paint light source and photomultiplier tube. A pressure-sensitive paint light source and a photomultiplier tube are installed at the glass window on the side wall of the variable-diameter piston cylinder. The reset device is installed on the right side in the variable diameter piston cylinder. The invention drives the turntable to cut the high-speed jet through the motor, the jet hits the variable-diameter piston, and squeezes the sealed pressure chamber to generate pressure. Since the high-speed jet is subjected to periodic cutting and squeezed by the piston, the pressure chamber produces pulsating pressure with sinusoidal periodic changes. Dynamic pressure-sensitive paint calibration via pulsating pressure. The invention has the advantages of adjustable pressure chamber, pressure average value and peak-to-peak value, and traceable source.

Description

A dynamic pressure-sensitive paint calibration device and calibration method based on sinusoidal pressure

Technical Field

The invention relates to a dynamic pressure-sensitive paint calibration device and a calibration method based on sinusoidal pressure, and in particular to a sinusoidal pressure calibration device with a large pressure chamber and adjustable pressure, belonging to the technical field of calibration tests.

Background Art

Pressure-sensitive paint technology is a relatively new aerodynamic test technology, mainly used for model surface pressure measurement in wind tunnel tests. As a pressure field parameter measurement technology, it is widely used because it can provide more abundant and effective test data. It is a replacement technology that can replace conventional pressure measurement test technology. At present, the dynamic performance calibration of pressure-sensitive paint basically uses a shock tube calibration device to calibrate the dynamic response characteristics. The shock tube generates a very fast step pressure acting on the pressure-sensitive paint, which can measure the response time characteristics of the pressure-sensitive paint. However, general dynamic pressure calibration also includes amplitude-frequency characteristics and phase difference under sinusoidal pressures of different frequencies. The above parameters cannot be measured by shock tubes. Therefore, in order to obtain the amplitude waveform following characteristics of pressure-sensitive paint at different frequencies, it is necessary to carry out dynamic calibration based on sinusoidal pressure. As a means of measuring pressure field, pressure-sensitive paint usually has large geometric dimensions of its pressure-sensitive surface due to process and function limitations. In order to ensure the pressure waveform and peak-to-peak value, the current sinusoidal pressure calibration device usually has a small pressure chamber, which cannot meet the calibration requirements of pressure-sensitive paint.

Summary of the invention

In view of the requirement of large pressure cavity and small pulsation value in pressure-sensitive paint calibration, the main purpose of the present invention is to provide a dynamic pressure-sensitive paint calibration device and calibration method based on sinusoidal pressure, wherein a motor drives a turntable to cut a high-speed jet, and the jet impacts a variable-diameter piston, squeezing a sealed pressure chamber to generate pressure. Since the high-speed jet is subjected to periodic cutting, it is squeezed by the piston, so that the pressure chamber generates a pulsating pressure with sinusoidal periodic changes, and dynamic pressure-sensitive paint calibration is achieved through the pulsating pressure. The present invention has the advantages of a large pressure cavity, adjustable pressure average value and peak-to-peak value, and traceability.

The objective of the present invention is achieved through the following technical solutions:

The present invention discloses a dynamic pressure-sensitive paint calibration device based on sinusoidal pressure, comprising an air inlet, a nozzle, a porous turntable, a pre-pressing hole, a reset device, a variable-diameter piston, a piston cylinder, a sealing cover plate, a glass window, an end cover, a laser vibrometer, a pressure-sensitive paint pattern, a transmission belt, a glass window, a pressure-sensitive paint light source, a photomultiplier tube, a pressure chamber and a pre-pressing chamber.

A motor plus a transmission device is used to drive the porous turntable, which generates periodic impact force on the variable-diameter piston by cutting high-pressure and high-speed jets, thereby generating sinusoidally varying pressure in the sealed pressure chamber; the main body of the device is a variable-diameter piston cylinder, and the left side of the piston cylinder is a sealed pressure chamber. A mounting hole is opened on the side wall of the pressure chamber for installing a pressure-sensitive paint pattern, and a glass window is opened on the left side of the cylinder body and the side wall of the cylinder body. The glass window is clamped and fixed by an end cover and a sealing cover plate; the right side of the piston cylinder is a chamber, in which a reset device for resetting the piston is installed, and a pre-pressure hole is opened on the right side of the chamber; the piston cylinder on the right side of the pressure chamber is fitted with the left side of the porous turntable; the right side of the turntable is fitted with the nozzle, and the inside of the nozzle is a variable-section structure for increasing the air flow velocity. The right side of the nozzle is connected to the air inlet, and the turntable is connected to the motor through a transmission belt; a laser vibrometer is installed on the left side of the variable-diameter piston cylinder; a pressure-sensitive paint light source and a photomultiplier tube are installed at the glass window on the side wall of the variable-diameter piston cylinder.

A pressure-sensitive paint light source and a photomultiplier tube are installed at the glass window on the side wall of the variable-diameter piston cylinder. The pressure-sensitive paint light source is used to excite the pressure-sensitive paint, and the photomultiplier tube is used to receive the fluorescence signal of the pressure-sensitive paint.

Preferably, the reset device is a spring coil installed on the right side of the variable-diameter piston cylinder, or an electromagnetic coil. When the electromagnetic coil is used, the problems of insufficient spring life and system vibration mode can be solved.

As a further preference, the spring coil and the variable-diameter piston form a second-order damped oscillation system. By adjusting the elastic coefficient of the spring coil and the mass of the variable-diameter piston, the natural frequency of the damping system is made consistent with the upper limit of the device calibration frequency. The system resonance is used to increase the pressure generated by the jet at high frequency, thereby solving the problem of low pressure generated by the jet at high frequency.

Preferably, a pre-stress hole is opened on the right side of the variable diameter piston cylinder, and air is inflated through the pre-stress hole to pre-stress the right side of the piston cylinder, which is used to adjust the initial position of the variable diameter piston and the initial pressure of the pressure chamber to prevent incomplete sinusoidal pressure waveform in the pressure chamber due to excessively high or low air supply pressure.

Preferably, a laser vibrometer is installed on the left side of the variable diameter piston cylinder, and the real-time displacement of the internal piston can be monitored through the glass window on the left side.

Preferably, the right side of the variable diameter piston cylinder is in contact with but not connected to the porous turntable, and the motor is connected via a transmission belt and drives the porous turntable to rotate, and circular holes are opened on the turntable for cutting airflow.

Preferably, the nozzle has a variable diameter structure inside, and the jet velocity is increased by changing the size and shape of the inner diameter, and the outlet is made square, and the side length of the square is consistent with the diameter of the circular hole on the porous turntable.

The present invention discloses a dynamic pressure-sensitive paint calibration method based on sinusoidal pressure, which is implemented based on the dynamic pressure-sensitive paint calibration device based on sinusoidal pressure. The dynamic pressure-sensitive paint calibration method based on sinusoidal pressure is implemented as follows:

Before calibration, select appropriate spring coils and pistons according to the upper limit of the calibration frequency, so that the natural frequency of the second-order oscillation system composed of the spring coils and pistons is close to the upper limit of the calibration frequency. To ensure that the sinusoidal pressure waveform is not distorted, the porous wheel must ensure that the holes are uniform and the arc length connecting the centers of the two holes is approximately twice the hole diameter.

A motor is used to drive a turntable to cut a high-speed jet to generate a periodic pulsating airflow as a pressure source. At the same time, a variable-diameter piston structure is used to convert the high-frequency pulsating pressure generated by the high-speed and high-pressure airflow into a large-volume, low-pulsation pressure field suitable for pressure-sensitive paint calibration.

The air enters and exits through the pre-pressure hole, and the initial pressure of the pre-pressure chamber is adjusted, thereby changing the initial value of the pulsating pressure of the pressure chamber. The initial value is the average value of the pulsating pressure. By adjusting the diameter and contraction ratio of the incoming flow nozzle, the incoming flow pressure and flow rate are changed, and the pulsating pressure values suitable for different working conditions are generated.

A laser vibrometer is used to record the displacement ΔL of the variable-diameter piston. According to the gas state equation, for a closed pressure chamber, PV = constant, so the pressure chamber pressure is calculated based on the displacement of the variable-diameter piston.

The test conditions of the dynamic pressure-sensitive paint calibration device include parameters: calibration frequency, sinusoidal pressure average value and pulsation value.

Frequency: According to the calibration requirements, the airflow impact frequency is changed by controlling the motor speed, thereby changing the pressure change frequency.

Average pressure value: Connect the pressure controller through the pre-pressure hole of the device, and change the initial pressure P ₀ by adjusting the pre-pressure chamber pressure, which is the calibrated average pressure value.

Pulsation value: The pulsation value of pressure is mainly driven by the gas source. Therefore, the peak-to-peak value of the pulsation pressure can be adjusted by adjusting the gas source pressure and the air inlet diameter.

Due to the gas state equation PV = γRT, when the ambient temperature remains unchanged, the pressure in the pressure chamber is inversely proportional to the pressure volume, that is: P ₀ V ₀ = P _t V _t .

The initial volume of the pressure chamber is:

The real-time pressure calculation formula in the pressure chamber is:

in:

ΔL-piston displacement;

_Pt - real-time pressure in the pressure chamber;

P; 0-initial pressure of the pressure chamber;

L ₀ - initial distance of the piston;

D-piston diameter.

Turn on the pressure-sensitive paint light source and photomultiplier tube, collect the pressure-sensitive paint light intensity signal, and then get the measurement result of the pressure-sensitive paint; according to the piston movement displacement data ΔL=f(t) recorded by the laser vibrometer, calculate the change of pressure in the pressure chamber with time, compare and get the dynamic characteristics of the pressure-sensitive paint, and realize dynamic pressure-sensitive paint calibration.

Beneficial effects:

1. The present invention discloses a dynamic pressure-sensitive paint calibration device and calibration method based on sinusoidal pressure. A motor drives a turntable to cut a high-speed jet. The jet impacts a variable-diameter piston and squeezes a sealed pressure chamber to generate pressure. Since the high-speed jet is subjected to periodic cutting, it is squeezed by the piston to generate a pulsating pressure with sinusoidal periodic changes in the pressure chamber. The pulsating pressure is used to realize the dynamic pressure-sensitive paint amplitude following characteristic calibration, that is, the dynamic pressure-sensitive paint calibration is realized.

2. The present invention discloses a dynamic pressure-sensitive paint calibration device and calibration method based on sinusoidal pressure, which generates sinusoidal pressure by directly impacting a piston with airflow. The air supply flow rate and speed can be adjusted according to demand to generate sinusoidal pressures of different amplitudes, and quantitative and precise adjustment can be achieved according to the constructed relationship.

3. In order to solve the problem of the smaller pressure chamber of the conventional inlet and outlet modulated sinusoidal pressure generator, the present invention discloses a dynamic pressure-sensitive paint calibration device and calibration method based on sinusoidal pressure, which adopts a piston structure to increase the sinusoidal pressure; and a pre-stressing hole is opened on the right side of the variable diameter piston cylinder, and the right side of the piston cylinder is pre-stressed by inflating through the pre-stressing hole, which is used to adjust the initial position of the variable diameter piston and the initial pressure of the pressure chamber to prevent the incomplete sinusoidal pressure waveform in the pressure chamber; in addition, the spring coil and the variable diameter piston form a second-order damped oscillation system, and the elastic coefficient of the spring coil and the mass of the variable diameter piston are adjusted to make the natural frequency of the damping system consistent with the upper limit of the calibration frequency of the device, and the pressure generated by the jet at high frequency is increased by using the system resonance.

4. The present invention discloses a dynamic pressure-sensitive paint calibration device and calibration method based on sinusoidal pressure, which obtains the pressure change in the pressure chamber by monitoring the piston position, thereby realizing dynamic pressure absolute method calibration.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front view of a dynamic pressure-sensitive paint calibration device based on sinusoidal pressure disclosed in the present invention.

FIG2 is a top view of a dynamic pressure-sensitive paint calibration device based on sinusoidal pressure disclosed in the present invention.

Among them, 1 is the air inlet, 2 is the nozzle, 3 is the porous turntable, 4 is the pre-pressing hole, 5 is the spring coil, 6 is the variable diameter piston, 7 is the piston cylinder, 8 is the sealing cover plate, 9 is the glass window, 10 is the end cover, 11 is the laser vibrometer, 12 is the pressure-sensitive paint pattern, 13 is the transmission belt, 14 is the glass window, 15 is the pressure-sensitive paint light source, 16 is the photomultiplier tube, 17 is the pressure chamber, and 18 is the pre-pressing chamber.

Figure 3 is a diagram of the main structure of the pressure chamber.

DETAILED DESCRIPTION

The technical solution of the present invention is further described in detail below by examples and in conjunction with the accompanying drawings. The technical problems solved by the technical solution of the present invention and the beneficial effects are also described. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention and do not have any limiting effect on it.

As shown in Figures 1 and 2, the present embodiment discloses a dynamic pressure-sensitive paint calibration device based on sinusoidal pressure, including an air inlet 1, a nozzle 2, a porous turntable 3, a pre-pressure hole 4, a spring coil 5, a variable diameter piston 6, a piston cylinder 7, a sealing cover plate 8, a glass window 9, an end cover 10, a laser vibrometer 11, a pressure-sensitive paint pattern 12, a transmission belt 13, a glass window 14, a pressure-sensitive paint light source 15, a photomultiplier tube 16, a pressure chamber 17 and a pre-pressure chamber 18.

The porous turntable 3 is driven by a motor and a transmission device, and a periodic impact force is generated on the variable-diameter piston 6 by cutting a high-pressure and high-speed jet, thereby generating a sinusoidally changing pressure in the sealed pressure chamber; the main body of the device is a variable-diameter piston cylinder 7, the left side of the piston cylinder 7 is a sealed pressure chamber, and a mounting hole is opened on the side wall of the pressure chamber for installing a pressure-sensitive paint pattern 12, while a glass window 9 is opened on the left side of the cylinder body, and a glass window 14 is opened on the side wall of the cylinder body, and the glass window is fixed by an end cover 10 and a sealing cover plate clamp 8; the right side of the piston cylinder is a cavity, which A spring coil 5 for resetting the piston is installed in the middle, and a pre-stressing hole is opened on the right side of the cavity, through which the initial pressure of the pre-stressing chamber 18 can be adjusted; the piston cylinder on the right side of the pressure chamber 17 is fitted with the left side of the porous turntable 3; the right side of the turntable is fitted with the nozzle 2, and the inside of the nozzle is a variable cross-section structure for increasing the air flow velocity, the right side of the nozzle is connected to the air inlet 1, and the turntable is connected to the motor through a transmission belt 13; a laser vibrometer 11 is installed on the left side of the variable diameter piston cylinder; a pressure-sensitive paint light source 15 and a photomultiplier tube 16 are installed at the glass window on the side wall of the variable diameter piston cylinder.

The dynamic pressure-sensitive paint calibration method based on sinusoidal pressure disclosed in this embodiment is implemented based on the dynamic pressure-sensitive paint calibration device based on sinusoidal pressure. The dynamic pressure-sensitive paint calibration method based on sinusoidal pressure is implemented as follows:

Before calibration, select appropriate spring coil 5 and variable diameter piston 7 according to the upper limit of calibration frequency, so that the natural frequency of the second-order oscillation system composed of spring coil and variable diameter piston is close to the upper limit of calibration frequency. In order to ensure that the sinusoidal pressure waveform is not distorted, the porous turntable 3 must ensure that the holes are uniform and the holes meet the arc length connecting the centers of the two holes is approximately twice the hole diameter.

Install the pressure-sensitive paint sample 12 and seal the pressure chamber. Fill the pressure chamber with appropriate gas through the pre-pressure hole according to the range of the pressure-sensitive paint to be measured. When the pressure chamber reaches a predetermined pressure P ₀ , the initial position of the variable-diameter piston 7 is recorded by the laser vibrometer 11 and set as the zero point. At this time, the diameter of the pressure chamber is consistent with the piston diameter D, and the length is L ₀ .

Adjust the intake pressure _P1 , so that the airflow passes through the porous turntable 3 and impacts the variable diameter piston 7. The piston is impacted by the high-speed and high-pressure airflow and moves to the right. At this time, the motor is turned on to rotate the porous turntable 3. The circular holes on the porous turntable cut the square holes of the nozzle 2, so that the impact of the airflow produces a sinusoidal periodic change. At this time, the piston system is forced to vibrate under the impact of the airflow. The piston reciprocates under the impact and the pressure in the pressure chambers on both sides, forming a sinusoidal pressure, and the frequency is determined by the rotation speed of the turntable.

From the gas state equation PV=γRT, it can be seen that when the ambient temperature remains unchanged, the pressure in the pressure chamber is inversely proportional to the pressure volume, that is: P ₀ V ₀ =P _t V _t .

The initial volume of the pressure chamber is:

The real-time pressure calculation formula in the pressure chamber is:

in:

ΔL-piston displacement;

_Pt- real-time pressure in the pressure chamber;

P ₀ - initial pressure of the pressure chamber;

L ₀ - initial distance of the piston;

D-piston diameter.

During the experiment, the pressure-sensitive paint light source and photomultiplier tube were turned on to collect the light intensity signal of the pressure-sensitive paint, and then the measurement results of the pressure-sensitive paint were obtained; based on the piston movement displacement data ΔL=f(t) recorded by the laser vibrometer, the change of pressure in the pressure chamber over time was calculated, and the dynamic characteristics of the pressure-sensitive paint were obtained by comparison to achieve dynamic pressure-sensitive paint calibration.

The specific description above further illustrates the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims (8)

1. A dynamic pressure-sensitive paint calibration device based on sinusoidal pressure, characterized in that: comprising an air inlet, a spout, a porous turntable, a preload hole, a reset device, a variable-diameter piston, a piston cylinder, a sealing cover plate, a glass window, End caps, laser vibrometers, pressure-sensitive paint patterns, transmission belts, glass windows, pressure-sensitive paint light sources, photomultiplier tubes, pressure chambers and pre-compression chambers; The motor and transmission device are used to drive the porous turntable, and by cutting high-pressure and high-speed jets, periodic impacts are generated on the variable-diameter piston, and then sinusoidally changing pressure is generated in the sealed pressure chamber; the main body of the device is a variable-diameter piston cylinder, and the left side of the piston cylinder is Sealed pressure chamber, a mounting hole is opened on the side wall of the pressure chamber for installing the pressure-sensitive paint pattern, and a glass window is opened on the left end of the cylinder body, and a glass window is opened on the side wall of the cylinder body, and the glass window is composed of an end cover and a sealing cover plate Clamping and fixing; the right side of the piston cylinder is a chamber, in which a reset device for piston reset is installed, and a pre-pressure hole is opened on the right side of the chamber; the piston cylinder on the right side of the pressure chamber is attached to the left side of the porous turntable; the right side of the turntable Fitted with the nozzle, the interior of the nozzle is a variable cross-section structure for increasing the airflow speed, the right side of the nozzle is connected to the air inlet, and the turntable is connected to the motor through a transmission belt; a laser vibrometer is installed on the left side of the variable-diameter piston cylinder; the variable-diameter piston cylinder A pressure-sensitive paint light source and a photomultiplier tube are installed at the glass window on the side wall; A pressure-sensitive paint light source and a photomultiplier tube are installed at the glass window on the side wall of the variable-diameter piston cylinder, the pressure-sensitive paint light source is used to excite the pressure-sensitive paint, and the photomultiplier tube is used to receive the fluorescent signal of the pressure-sensitive paint. 2. A dynamic pressure-sensitive paint calibration device based on sinusoidal pressure according to claim 1, characterized in that: the reset device is a spring coil installed on the right side of the variable-diameter piston cylinder, or an electromagnetic coil. 3. A dynamic pressure-sensitive paint calibration device based on sinusoidal pressure as claimed in claim 2, characterized in that: the spring coil and the variable diameter piston form a second-order damped oscillation system, by adjusting the elastic coefficient and variable diameter of the spring coil The mass of the diameter piston makes the natural frequency of the damping system consistent with the upper limit of the calibration frequency of the device, and uses the system resonance to increase the pressure generated by the jet at high frequencies. 4. A dynamic pressure-sensitive paint calibration device based on sinusoidal pressure as claimed in claim 2 or 3, characterized in that: a pre-pressure hole is opened on the right side of the variable-diameter piston cylinder, and the piston is inflated through the pre-pressure hole. The preload on the right side of the cylinder is used to adjust the initial position of the reducing piston and the initial pressure of the pressure chamber. 5. A kind of dynamic pressure-sensitive paint calibration device based on sinusoidal pressure as claimed in claim 2 or 3, it is characterized in that: a laser vibrometer is installed on the left side of the variable diameter piston cylinder, and the glass window on the left side can Monitor the real-time displacement of the internal piston. 6. A dynamic pressure-sensitive paint calibration device based on sinusoidal pressure as claimed in claim 2 or 3, characterized in that: the right side of the variable-diameter piston cylinder is attached to but not connected to the porous turntable, and the motor is connected by a transmission belt And drive the multi-hole turntable to rotate, and the turntable has round holes for cutting airflow. 7. A kind of dynamic pressure-sensitive paint calibration device based on sinusoidal pressure as claimed in claim 2 or 3, characterized in that: the inside of the nozzle is a variable diameter structure, by changing the size and shape of the inner diameter, the jet velocity is increased, and the The outlet is a square, and the side length of the square is consistent with the diameter of the circular hole on the porous turntable. 8. A dynamic pressure-sensitive paint calibration method based on sinusoidal pressure, based on a dynamic pressure-sensitive paint calibration device based on sinusoidal pressure as claimed in claim 2 or 3, characterized in that: Before calibration, select the appropriate spring coil and piston according to the upper limit of the calibration frequency, so that the natural frequency of the second-order oscillation system composed of the spring coil and the piston is close to the upper limit of the calibration frequency; in order to ensure that the sinusoidal pressure waveform is not distorted, the porous disc must ensure The openings are uniform, and the arc length connecting the centers of the two openings is about twice the diameter of the opening; The motor drives the turntable to cut the high-speed jet to generate periodic pulsating airflow as a pressure source, and at the same time adopts a variable-diameter piston structure to convert the high-frequency pulsating pressure generated by the high-speed high-pressure airflow into a large volume and low pulsation pressure suitable for pressure-sensitive paint calibration. field; The air enters and exits through the pre-compression hole, adjusts the initial pressure of the pre-compression chamber, thereby changing the initial value of the pulsating pressure of the pressure chamber, which is the average value of the pulsating pressure, and changing the incoming flow pressure by adjusting the diameter and contraction ratio of the incoming flow nozzle , flow rate, and generate pulsating pressure values suitable for different working conditions; A laser vibrometer is used to record the displacement of the variable diameter piston ΔL. According to the gas state equation, for a closed pressure chamber, PV=constant, so the pressure of the pressure chamber is calculated according to the displacement of the variable diameter piston; The test conditions of the dynamic pressure-sensitive paint calibration device include parameters: calibration frequency, mean value of sinusoidal pressure and pulsation value; Frequency: According to the calibration requirements, by controlling the motor speed, the airflow impact frequency is changed, thereby changing the pressure change frequency; Average pressure: connect the pressure controller through the pre-pressure hole of the device, and change the initial pressure P ₀ by adjusting the pressure of the pre-pressure chamber, which is the calibrated average pressure value; Pulsation value: The pressure pulsation value is mainly driven by the air source, so the peak-to-peak value of the pulsation pressure can be adjusted by adjusting the air source pressure and the diameter of the air inlet; Due to the gas state equation PV=γRT, when the ambient temperature is constant, the pressure in the pressure chamber is inversely proportional to the pressure volume, namely: P ₀ V ₀ =P _t V _t ; The initial volume of the pressure chamber is:

Then the real-time pressure calculation formula in the pressure chamber is:

in: ΔL—piston displacement; P _t — real-time pressure in the pressure chamber; P ₀ —the initial pressure of the pressure chamber; L ₀ —the initial distance of the piston; D—piston diameter. Turn on the pressure-sensitive paint light source and photomultiplier tube, collect the light intensity signal of the pressure-sensitive paint, and then obtain the measurement result of the pressure-sensitive paint; according to the piston movement displacement data ΔL=f(t) recorded by the laser vibrometer, calculate the The pressure changes with time, and compare the dynamic characteristics of the pressure-sensitive paint to achieve dynamic pressure-sensitive paint calibration.

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