CN105675192B - A kind of electromagnetic pulse force measuring method and device - Google Patents

Abstract

The invention relates to the field of electromagnetism, and provides a method and device for measuring electromagnetic pulse force, comprising: a discharge capacitor (1), a copper strip coil (2), an equilateral triangular aluminum plate (3), a high-speed camera (4), and a control switch (6 ), spring (9); the copper strip coil (2) is fixed on the lower table (7), one end of the copper strip coil (2) is electrically connected to one end of the discharge capacitor (1), and the other end of the copper strip coil (2) is connected to the control switch ( 6) One end is electrically connected, and the other end of the discharge capacitor (1) is electrically connected to the other end of the control switch (6); an equilateral triangular aluminum plate (3) is suspended directly under the copper strip coil (2), and the equilateral triangular aluminum plate (3) Parallel to the copper strip coil (2), the three vertices of the equilateral triangle aluminum plate (3) are upwardly connected with the projection points of these three points on the upper table (8) by the spring (9); the upper table (8) and the lower table ( 7) Parallel; the high-speed camera (4) shoots the equilateral triangle aluminum plate (3) from the horizontal direction. The invention can accurately measure the change process of the pulse force of the system.

Description

Method and device for measuring electromagnetic pulse force

technical field

The invention relates to the field of electromagnetism, in particular to an electromagnetic pulse force measuring method and device.

Background technique

In recent years, a lot of research has been done on electromagnetic pulse in aircraft deicing in China. The United States has conducted a large number of tests and flight tests on electromagnetic pulse. Only Russia has applied electromagnetic pulse, but the fatigue problem of the skin has not been solved. The electromagnetic pulse deicing system is not only low in weight and cost, but also low in power consumption, reliable, easy to maintain, and has better development prospects. Due to the short discharge of the capacitance of the electromagnetic pulse deicing system, which is a transient change, the pulse force applied by the coil to the skin cannot be measured by ordinary equipment and instruments. Too little force on the skin will invalidate the deicing function of the system, and excessive force on the skin will damage the skin structure, so the measurement of skin force by electromagnetic pulse force becomes the key.

Contents of the invention

The purpose of the present invention is:

A method and device for measuring electromagnetic pulse force is proposed, which can accurately measure the change process of system pulse force.

Technical scheme of the present invention is:

An electromagnetic pulse force measuring device, comprising:

Discharge capacitor 1, copper strip coil 2, equilateral triangle aluminum plate 3, high-speed camera 4, control switch 6, spring 9;

The copper strip coil 2 is fixed on the lower table 7, one end of the copper strip coil 2 is electrically connected to one end of the discharge capacitor 1, the other end of the copper strip coil 2 is electrically connected to one end of the control switch 6, and the other end of the discharge capacitor 1 is electrically connected to the other end of the control switch 6 Place an equilateral triangular aluminum plate 3 in the air directly below the copper strip coil 2, the equilateral triangular aluminum plate 3 is parallel to the copper strip coil 2, and the three apexes of the equilateral triangular aluminum plate 3 pass through the spring 9 upwards and these three points are on the upper table 8 The projection points are connected; the upper table 8 is parallel to the lower table 7; the high-speed camera 4 photographs the equilateral triangle aluminum plate 3 from the horizontal direction.

Specifically, the diameter of the copper strip coil 2 is less than 100 mm, and the distance between the center of gravity and the side of the equilateral triangular aluminum plate 3 is more than 10 times the coil diameter; the shooting rate of the high-speed camera 4 is greater than or equal to one million frames per second.

An electromagnetic pulse force measurement method, comprising:

Step 1, turn on the high-speed camera 4 to photograph the three vertices A, B, and C of the equilateral triangle aluminum plate 3,

Step 2. Press the control switch, the discharge capacitor is discharged, the equilateral triangular aluminum plate 3 vibrates up and down under the action of the copper strip coil, and the high-speed camera captures the displacement process of the three vertices of the equilateral triangular aluminum plate;

Step 3. Calculate the actual displacement changes of the three vertices of the equilateral triangle aluminum plate through the high-speed camera 4 camera picture and the camera imaging ratio:

The actual stretching length of the spring connected to vertex A is k ₁ d _A , the actual stretching length of the spring connected to vertex B is k ₂ d _B , and the actual stretching length of the spring connected to vertex C is k ₃ d _C ;

Among them, the imaging ratio of the vertex _A camera is k ₁ , the imaging ratio of the vertex B camera is k ₂ , and the imaging ratio of the vertex C camera is k ₃ ; The stretch length d _B in the camera picture, the spring connected to the vertex C stretches the length d _C in the camera picture

Step 4. Calculate the actual displacement change of the center of gravity of the regular triangle aluminum plate through the actual displacement changes of the three vertices of the regular triangle aluminum plate:

The tensile length of the center of gravity of the equilateral triangle aluminum plate is (k ₁ d _A +k ₂ d _B +k ₃ d _C )/3;

Step 5. Combining the actual displacement change of the center of gravity of the equilateral triangular aluminum plate with the elastic coefficient of the spring to calculate the change process of the pulse force on the equilateral triangular aluminum plate:

The force of the triangular aluminum plate is: 3*F*(k ₁ d _A +k ₂ d _B +k ₃ d _C )/3=F*(k ₁ d _A +k ₂ d _B +k ₃ d _C ),

Among them, F is the spring elastic coefficient.

The advantages of the present invention are:

The invention uses an ultra-high-speed camera to shoot the displacement of the stressed aluminum plate, which can capture the entire dynamic change process of the spring under force, and has high measurement accuracy;

The invention adopts the equilateral triangular aluminum plate to simulate the force of the skin, and the force displacement of the equilateral triangular aluminum plate can be equivalent to the displacement of the center of gravity of the triangle, and the calculation of the pulse force is simple.

Description of drawings

Fig. 1 Schematic diagram of the installation of the pulse force measurement of the electric pulse deicing system;

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

An electromagnetic pulse force measuring device, as shown in Figure 1, comprises:

Discharge capacitor 1, copper strip coil 2, equilateral triangle aluminum plate 3, high-speed camera 4, control switch 6, spring 9;

The copper strip coil 2 is fixed on the lower table 7, one end of the copper strip coil 2 is electrically connected to one end of the discharge capacitor 1, the other end of the copper strip coil 2 is electrically connected to one end of the control switch 6, and the other end of the discharge capacitor 1 is electrically connected to the other end of the control switch 6 Place an equilateral triangular aluminum plate 3 in the air directly below the copper strip coil 2, the equilateral triangular aluminum plate 3 is parallel to the copper strip coil 2, and the three apexes of the equilateral triangular aluminum plate 3 pass through the spring 9 upwards and these three points are on the upper table 8 The projection points are connected; the upper table 8 is parallel to the lower table 7; the high-speed camera 4 photographs the equilateral triangle aluminum plate 3 from the horizontal direction.

Specifically, the diameter of the copper strip coil 2 is less than 100 mm, and the distance between the center of gravity and the side of the equilateral triangular aluminum plate 3 is more than 10 times the coil diameter; the shooting rate of the high-speed camera 4 is greater than or equal to one million frames per second.

An electromagnetic pulse force measurement method, comprising:

Step 1, turn on the high-speed camera 4 to photograph the three vertices A, B, and C of the equilateral triangle aluminum plate 3,

Step 2. Press the control switch, the discharge capacitor is discharged, and the equilateral triangular aluminum plate 3 vibrates up and down under the action of the copper strip coil, and the high-speed camera captures the displacement process of the three vertices of the equilateral triangular aluminum plate;

Step 3. Calculate the actual displacement changes of the three vertices of the equilateral triangle aluminum plate through the high-speed camera 4 camera picture and the camera imaging ratio:

The actual stretching length of the spring connected to vertex A is k ₁ d _A , the actual stretching length of the spring connected to vertex B is k ₂ d _B , and the actual stretching length of the spring connected to vertex C is k ₃ d _C ;

Among them, the imaging ratio of the vertex _A camera is k ₁ , the imaging ratio of the vertex B camera is k ₂ , and the imaging ratio of the vertex C camera is k ₃ ; The stretch length d _B in the camera picture, the spring connected to the vertex C stretches the length d _C in the camera picture

Step 4. Calculate the actual displacement change of the center of gravity of the regular triangle aluminum plate through the actual displacement changes of the three vertices of the regular triangle aluminum plate:

The tensile length of the center of gravity of the equilateral triangle aluminum plate is (k ₁ d _A +k ₂ d _B +k ₃ d _C )/3;

Step 5. Combining the actual displacement change of the center of gravity of the equilateral triangular aluminum plate with the elastic coefficient of the spring to calculate the change process of the pulse force on the equilateral triangular aluminum plate:

The force of the triangular aluminum plate is: 3*F*(k ₁ d _A +k ₂ d _B +k ₃ d _C )/3=F*(k ₁ d _A +k ₂ d _B +k ₃ d _C ),

Among them, F is the spring elastic coefficient.

The invention can be applied to the pulse force measurement of the skin of the aircraft wing electric pulse deicing system, can accurately measure the pulse force change process of the system, and is suitable for the development of the aircraft electric pulse deicing system.

Claims (3)

1. An electromagnetic pulse force measuring device, characterized in that, comprising: Discharge capacitor (1), copper strip coil (2), equilateral triangular aluminum plate (3), high-speed camera (4), control switch (6), spring (9); The copper strip coil (2) is fixed on the lower table (7), one end of the copper strip coil (2) is electrically connected to one end of the discharge capacitor (1), and the other end of the copper strip coil (2) is electrically connected to one end of the control switch (6). The other end of the capacitor (1) is electrically connected to the other end of the control switch (6); an equilateral triangular aluminum plate (3) is suspended directly below the copper strip coil (2), and the equilateral triangular aluminum plate (3) is connected to the copper strip coil (2) Parallel, the three apexes of the regular triangle aluminum plate (3) are upwardly connected with the projection points of these three points on the upper table (8) by the spring (9); the upper table (8) is parallel to the lower table (7); the high-speed camera ( 4) Shoot the equilateral triangle aluminum plate (3) from the horizontal direction. 2. A kind of electromagnetic pulse force measuring device as claimed in claim 1, is characterized in that, copper strip coil (2) diameter is below 100mm, and equilateral triangle aluminum plate (3) center of gravity and side distance are more than 10 times of coil diameter ; The shooting rate of the high-speed camera (4) is greater than or equal to one million frames per second. 3. A kind of electromagnetic pulse force measuring method of a kind of electromagnetic pulse force measuring device as claimed in claim 1, is characterized in that, comprises: Step 1, turn on the high-speed camera (4) to photograph the three vertices A, B, and C of the equilateral triangle aluminum plate (3), Step 2, press the control switch, the discharge capacitor is discharged, the equilateral triangular aluminum plate (3) vibrates up and down under the action of the copper strip coil, and the high-speed camera captures the displacement process of the three vertices of the equilateral triangular aluminum plate; Step 3. Calculate the actual displacement changes of the three vertices of the equilateral triangle aluminum plate through the high-speed camera (4) and the imaging ratio of the camera: The actual stretching length of the spring connected to vertex A is k ₁ d _A , the actual stretching length of the spring connected to vertex B is k ₂ d _B , and the actual stretching length of the spring connected to vertex C is k ₃ d _C ; Among them, the imaging ratio of the vertex _A camera is k ₁ , the imaging ratio of the vertex B camera is k ₂ , and the imaging ratio of the vertex C camera is k ₃ ; The stretching length d _B in the camera picture, and the stretching length d _C of the spring connected to the vertex C in the camera picture; Step 4. Calculate the actual displacement change of the center of gravity of the regular triangle aluminum plate through the actual displacement changes of the three vertices of the regular triangle aluminum plate: The tensile length of the center of gravity of the equilateral triangle aluminum plate is (k ₁ d _A +k ₂ d _B +k ₃ d _C )/3; Step 5. Combining the actual displacement change of the center of gravity of the equilateral triangular aluminum plate with the elastic coefficient of the spring to calculate the change process of the pulse force on the equilateral triangular aluminum plate: The force of the triangular aluminum plate is: 3*F*(k ₁ d _A +k ₂ d _B +k ₃ d _C )/3=F*(k ₁ d _A +k ₂ d _B +k ₃ d _C ), Among them, F is the spring elastic coefficient.