CN110187145B - Device and method for calibrating accelerometer by utilizing wide pulse generated by variable cross-section bullet beam - Google Patents
Device and method for calibrating accelerometer by utilizing wide pulse generated by variable cross-section bullet beam Download PDFInfo
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- CN110187145B CN110187145B CN201910481436.XA CN201910481436A CN110187145B CN 110187145 B CN110187145 B CN 110187145B CN 201910481436 A CN201910481436 A CN 201910481436A CN 110187145 B CN110187145 B CN 110187145B
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Abstract
The invention relates to a device and a method for calibrating an accelerometer by utilizing a wide pulse generated by a variable cross-section bullet beam, which replace the original bullet heads by the bullet beam consisting of four bullet heads and adopt a large-size shaper. Has the advantages that: due to the adoption of the bullet beam and the large-size shaper, the pulse widths of a plurality of groups of acceleration excitation pulses can be ensured to be the same. The assembly is simple and feasible, and the geometric shape of the bullet conical front end mainly determining the excitation pulse waveform is randomly changed, so that the requirements of different pulse widths and g values are met. The impact end of the calibration rod can be effectively protected by using the large-size shaper, the same pulse width of the excitation pulse generated by each impact is ensured, and the reduction of the amplitude of the excitation pulse caused by the shaper can be compensated by increasing the wave impedance and the impact speed of the bullet material and the like. The standard metering pulse with wide pulse width and high amplitude generated by the method is also suitable for accurately calibrating the dynamic linearity of various dynamic speed sensors and displacement sensors.
Description
Technical Field
The invention belongs to a device and a method for calibrating an accelerometer by using wide pulses, and relates to a device and a method for calibrating an accelerometer by using the wide pulses generated by a variable cross-section bullet beam. Based on the Hopkinson rod device, a bullet bundle with a variable cross section impacts a calibration rod, three or more groups of high-g-value acceleration standard metering pulses with the same main frequency and different amplitudes are generated by changing the assembly mode of each bullet in the bullet bundle, and the target pulse width generated by the bullet with the variable cross section can reach more than 200 mu s, so that the dynamic linearity of the accelerometer with the high g value is accurately calibrated in a wider frequency range lower than the inherent frequency of the accelerometer.
Background
Referring to fig. 3, document 1 (li yulong, guo wegian, jadein et al, research on calibration system of high-g-value acceleration sensor [ D ]. explosion and impact, 1997,17(1):90-96) discloses a technique and method for dynamically calibrating sensitivity of a high-g-value accelerometer by generating a compression stress wave using the Hopkinson strut technique. The device comprises a pneumatic launching gun barrel 1, a cone-head bullet 16, a shaper 17, a calibration rod 6, a strain gauge 7, a vacuum clamp 8, a high-g-value accelerometer 9, a valve controller 10 and an air source 11. When the high-g-value accelerometer 9 is dynamically calibrated, the high-g-value accelerometer 9 to be measured is firstly fixed at the tail end of the calibration rod 6 by using the vacuum clamp 8, so that the high-g-value accelerometer 9 is in interface contact with the tail end of the calibration rod 6 and the transverse backward movement of the high-g-value accelerometer 9 is not limited. Then, the cone-head bullet 16 impacts the calibration rod 6 to generate a high-g-value excitation pulse, and the waveform shaper 17 shapes the pulse waveform between the cone-head bullet 16 and the calibration rod 6 and protects the end of the calibration rod. The generated excitation pulse is loaded to the high-g-value accelerometer 9 through the calibration rod 6, the two strain gauges 7 adhered to the surfaces of the calibration rod 6 are used for recording the excitation pulse, and according to the one-dimensional elastic stress wave theory and the Hopkinson pressure bar principle, the excitation pulse recorded by the strain gauges 7 and the output of the high-g-value accelerometer 9 are compared, so that the sensitivity of the high-g-value accelerometer 9 can be accurately and dynamically calibrated. In the device, a variable-section cone head bullet is matched with a waveform shaper to realize acceleration metering pulse with wider pulse width, the acceleration pulse width reaches more than 120 mu s in a test, and the amplitude can reach 20 ten thousand g.
Referring to FIG. 4, document 2(Yuan K, Guo W, Su Y, et al. study on sectional key schemes in shock calibration of high-g accelerometers using Hopkinson bar [ J ]. Sensors and Actuators A: Physical,2017,258:1-13) discloses a method for accurately calibrating the dynamic linearity of a high-g value accelerometer by improving a bullet launching device based on a Patent (Umedia A. method and device for measuring dynamic linearity of an access sensor. Unit States Patent US 2005/0160785A 1; 2005). The device comprises a pneumatic launching gun barrel 1, a countersunk screw 18, an outer bullet 19, an inner bullet 20, a calibration rod 6, a strain gauge 7, a vacuum clamp 8, a high-g-value accelerometer 9, a valve controller 10 and an air source 11. In this device, the relative positions of coaxial outer 19 and inner 20 bullets are fixed by means of countersunk screws 18, and a high-g accelerometer 9 is mounted at the end of a calibration rod 6 by means of a vacuum clamp 8. When the dynamic linearity test of the accelerometer is carried out, the first step is as follows: the head of the inner bullet 20 is enabled to be close to the head of the outer bullet 19 for a certain distance and fixed by using a countersunk screw 18, when the air source 11 reaches a preset value, the valve controller 10 is opened, at the moment, the head of the inner bullet 20 impacts the end part of the calibration rod 6 before the outer bullet 19, and the strain gauge 7 and the high-g-value accelerometer 9 respectively record excitation pulses and response pulses to obtain a first impact result; the second step is that: the head of the outer bullet 19 is enabled to be close to the head of the inner bullet 20 for a certain distance and fixed by using a countersunk screw 18, when the air source 11 reaches a preset value, the valve controller 10 is opened, at the moment, the head of the outer bullet 19 impacts the end part of the calibration rod 6 before the inner bullet 20, and the strain gauge 7 and the high-g-value accelerometer 9 respectively record excitation pulses and response pulses to obtain a second impact result; the third step: the heads of the inner bullet 20 and the outer bullet 19 are flush and fixed by the countersunk head screw 18, when the air source 11 reaches a preset value, the valve controller 10 is opened, the inner bullet 20 and the outer bullet 19 simultaneously impact the end part of the calibration rod 6, and the strain gauge 7 and the high-g-value accelerometer 9 record an excitation pulse and a response pulse respectively to obtain a third impact result. Then, linear fitting is carried out on the three excitation pulses recorded by the strain gauge 7 to obtain corresponding linear fitting parameters, and the linear relationship of the three groups of response pulses output by the high-g-value accelerometer 9 is verified by using the linear relationship, so that the dynamic linearity of the high-g-value accelerometer 9 is calibrated. Since this document and patent uses a flat-headed bullet to strike the calibrated rod 6 and requires that three strikes be maintained to produce high g-value acceleration pulses of the same pulse width, a wave shaper is not used. Therefore, the acceleration pulse width is about 25 mus and the amplitude can exceed 40 ten thousand g.
In fact, when the dynamic linearity of the accelerometer with a high g value is calibrated, the main frequency of the excitation pulse cannot be too high, that is, the pulse width cannot be too narrow, otherwise, the installation natural frequency of the accelerometer to be tested may be excited, which causes a large calibration error. The inherent frequencies of various high-g value accelerometers applied at present are different, and the higher frequency can reach more than hundreds of thousands of Hz. When the dynamic calibration is carried out on the high-g-value accelerometer, the excitation pulse with the pulse width of 25 mu s does not cause the resonance of an accelerometer mounting system, and the calibration can be normally carried out. However, when calibrating a high-g-value accelerometer with a lower natural frequency, particularly the mounting resonance frequency of the accelerometer is generally lower than the first-order natural frequency of the accelerometer, an accelerometer pulse with a wider pulse width is required as an excitation pulse, so that the accuracy of dynamic calibration is ensured. Meanwhile, the system calibration of the dynamic linearity of the high-g-value accelerometer in different frequency ranges is realized, and the method is also a development target of the accelerometer calibration technology. Therefore, developing loading techniques that produce standard metrology pulses with wider pulse widths is necessary to calibrate the dynamic linearity of high-g accelerometers over lower frequency ranges. And if the dominant frequency of the acceleration standard metering pulse obtained by the technical requirement is less than 5000Hz, the pulse width of the excitation pulse generated by the impact is required to be more than 200 mus. To obtain acceleration standard metering pulses with wide pulse widths, requiring extension of the rise width of the stress wave generated by the impact, the use of variable cross-section bullets and wave shapers are two well-established effective methods. Therefore, there is a need for improvement on the calibration method shown in fig. 4, and development of a wide pulse width excitation pulse generation technique for dynamic linearity calibration of high-g accelerometers in a lower frequency range.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a device and a method for calibrating an accelerometer by utilizing wide pulses generated by variable cross-section bullet beams. By referring to the idea of simultaneous multi-bullet shooting in fig. 4, the geometric configuration of the coaxial flat head double bullets is improved, and three or more groups of high-g-value acceleration pulses with wider pulse widths are obtained by matching with a waveform shaper. In order to obtain the acceleration pulse with wide pulse width, a variable cross-section bullet and a waveform shaper are adopted, and the geometric shape of the bullet, the material and the size of the waveform shaper are optimally designed; when the variable cross-section bullet is used, the pulse widths of a plurality of groups of acceleration pulses in primary calibration are required to be consistent, and according to the positive correlation relation between the stress wave amplitude and the bullet sectional area, the design requirements of the variable cross-section and the same pulse width are difficult to simultaneously meet by the inner and outer coaxial cylindrical bullet, so that the assembly mode of a plurality of bullets needs to be redesigned. The assembly method needs to satisfy the following conditions: the bullet with the variable cross-section can be conveniently launched simultaneously, the relative position of the bullets can be freely adjusted, and the bullet can be repeatedly used.
Technical scheme
A device for calibrating an accelerometer by utilizing a wide pulse generated by a variable cross-section bullet beam comprises a pneumatic launching gun barrel 1, a calibration rod 6, a strain gauge 7, a vacuum clamp 8, a high-g-value accelerometer 9, a valve controller 10 and an air source 11; the bullet beam is characterized by also comprising a bullet beam 2 for replacing a cone-head bullet and a large-size shaper 5 for replacing the shaper; the bullet bundle 2 is formed by cutting a bullet with two conical ends and a cylindrical middle part into a plurality of cone structures along two orthogonal geometric symmetry planes in the axial direction, and an annular bullet holder 3 is arranged at the cylindrical middle part and is fixed by an inner hexagon bolt 3; the large-size shaper 5 is made of an aluminum alloy cushion block with the diameter of 28mm and the thickness of 15 mm.
The plurality of cone structures are four cones and comprise an A bullet 12, a B bullet 13, a C bullet 14 and a D bullet 15; a bullet 12, B bullet 13, C bullet 14 and D bullet 15.
The A bullet 12, the B bullet 13, the C bullet 14 and the D bullet 15 are in sliding fit.
The bullet bundle 2 is made of high-strength steel.
The annular bullet holder 3 is made of polytetrafluoroethylene materials.
A test method of any device for calibrating an accelerometer by utilizing a wide pulse generated by a variable cross-section bullet beam is characterized by comprising the following steps:
step 1: the warheads of N bullets in the bullet bundle 2 are level and level, the bullet bundle is placed at the bottom of the gun barrel 1, when the air source 11 reaches a preset value, the valve controller 10 is opened, the bullet bundle 2 impacts the large-size shaper 5 and the incident rod 6, the strain gauge 7 records the strain history generated by impact, the accelerometer 9 with the high g value to be detected senses and outputs acceleration response pulses, and excitation and response data of a first group with the highest g value are obtained;
and step 3: the method comprises the following steps that the distance d is that the warhead of any bullet in a bullet bundle 2 is close to the distance of other bullets, the bullet bundle 2 is placed at the bottom of a gun barrel 1, a valve controller 10 is opened when an air source 11 reaches a preset value, the bullet bundle 2 impacts a large-size shaper 5 and an incident rod 6, a strain gauge 7 records strain history generated by impact, an accelerometer 9 with a high g value to be detected senses and outputs acceleration response pulses, and excitation and response data of a third group with the lowest g value are obtained;
and step 3: enabling the warheads of any two bullets on the diagonal in the bullet bundle 2 to be close to the other bullets by a distance d, placing the bullet bundle 2 at the bottom of the gun barrel 1, opening a valve controller 10 when an air source 11 reaches a preset value, enabling the bullet bundle 2 to impact a large-size shaper 5 and an incident rod 6 at the moment, recording a strain history generated by impact by a strain gauge 7, sensing and outputting an acceleration response pulse by an accelerometer 9 with a high g value to be detected, and obtaining an Nth group of excitation and response data with the Nth high g value;
selecting the number of the warheads of the bullets in the bullet bundle 2, and repeating the step to obtain excitation and response data less than N-2 times;
and 4, step 4: and according to a calculation method of the linearity of the dynamic accelerometer, performing linear fitting on the excitation pulses for N times recorded by the strain gauge 7 to obtain fitting parameters of response, and verifying N groups of response pulses output by the high-g-value accelerometer 9 by using the linear relation, thereby calibrating the dynamic linearity of the high-g-value accelerometer 9.
Advantageous effects
The invention provides a device and a method for calibrating an accelerometer by utilizing a wide pulse generated by a variable cross-section bullet beam, which replace the original bullet heads by the bullet beam consisting of four bullet heads and adopt a large-size shaper. The invention has the beneficial effects that: because four bullets with the same geometric configuration are adopted, and the pulse width influence of the large-size shaper on the excitation pulse generated by the impact of any bullets with different numbers is the same, the pulse width of a plurality of groups of acceleration excitation pulses can be ensured to be the same. The optimally designed three-section variable cross-section bullet bundle can prolong the pulse width of the excitation pulse, ensures simple and feasible assembly, and simultaneously realizes the horizontal axis of the bullet in the launching and impacting processes so as to impact the calibration rod in a centering way. The pulse generation method of the sectional type variable cross-section bullet bundle provided by the invention can allow the geometrical shape of the bullet cone front end which mainly determines the excitation pulse waveform to be randomly changed, such as spindle shape, streamline shape and the like, so that the requirements of different pulse widths and g values are met. Meanwhile, the cutting of the bullet bundle into four bullets is to realize three groups of excitation pulses with the same main frequency, the cutting mode allows the bullet bundle to be cut into a larger number of bullets, and the cutting with unequal angles is also allowed, so that more than three groups of excitation pulses with the same main frequency and different amplitudes are realized. Any warhead shape and free cutting pattern allows the resulting standard metering pulses to cover a wider range of pulse widths and amplitudes. The impact end of the calibration rod can be effectively protected by using the large-size shaper, the same pulse width of the excitation pulse generated by each impact is ensured, and the reduction of the amplitude of the excitation pulse caused by the shaper can be compensated by increasing the wave impedance and the impact speed of the bullet material and the like. The mode that utilizes bolt and bullet support to fix the bullet bundle is convenient for adjust the relative position of each bullet, and the device easy operation, good reproducibility, the measuring accuracy is high. The method can also adopt a light measuring method to directly test the displacement/speed history of the tail end of the calibration rod, replaces the strain history of the strain gauge test, and is used as the absolute value of the excitation pulse, so that the test precision is further improved. Through tests and numerical simulation verification, the method can realize high-g-value acceleration pulses with the pulse width exceeding more than 200 mu s. The standard metering pulse with wide pulse width and high amplitude generated by the method is also suitable for accurately calibrating the dynamic linearity of various dynamic speed sensors and displacement sensors.
Drawings
FIG. 1 is a schematic structural diagram of the device for calibrating dynamic linearity of an accelerometer by using a wide pulse generated by a variable cross-section bullet beam.
Fig. 2-1 is a front view of the method of assembling a sub-bundle of the present invention.
Fig. 2-2 is an assembly view of the present invention where all four bullets simultaneously strike the target rod, where a and b are different angle views.
Fig. 2-3 are schematic views of the assembly of the present invention in which two diagonal bullets first strike a calibrated rod, wherein a and b are different angle views.
Fig. 2-4 are schematic views of the assembly of the present invention with any one bullet striking the target rod first, with a and b being different angle views.
Fig. 3 is a schematic diagram of the dynamic calibration method of the high-g-value accelerometer based on the Hopkinson bar proposed in reference 1.
Fig. 4 is a schematic diagram of the method for calibrating the dynamic linearity of high-g acceleration by using a coaxial binuclear bomb disclosed in reference 2.
In the figure, 1-gun barrel; 2-a bullet bundle; 3-supporting by a bullet; 4-hexagon socket head cap screw; 5-large size shaper; 6-calibration rod; 7-strain gauge; 8-vacuum clamp; 9-high g-value accelerometer; 10-a valve controller; 11-a gas source; a 12-A bullet; a 13-B bullet; a 14-C bullet; a 15-D bullet; 16-cone-head bullets; 17-a shaper; 18-countersunk head screws; 19-outer bullet; 20-inner bullet.
FIG. 2
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the technical scheme adopted by the invention is as follows: as shown in fig. 1 and 2, the bullet with two ends having tapered ends and a cylindrical middle is cut along two orthogonal geometric symmetry planes in the axial direction, and the bullet before cutting is a centrosymmetric variable cross-section bullet, so that the four cut bullets all have the same variable cross-section geometric characteristics, thereby ensuring that the generated excitation pulse width has the same pulse width and amplitude variation characteristics when any number of bullets are selected for impact. Meanwhile, in order to protect the impact end of the calibration rod, a large-size shaper is selected as protection. According to the selection rule of the shapers, the shaping effect of the shapers with larger thickness and size is smaller, so that when any bullets with different numbers are used for collision, the shaping effect of the shapers with larger size is smaller and can be considered to be the same. The adopted geometric configuration of the variable cross-section bullet bundle is mainly divided into three sections: the longer conical bullet head can effectively prolong the rising edge width of a stress wave generated by impact, thereby achieving the effect of increasing the pulse width of the excitation pulse; the middle part of the bullet bundle is provided with a section of cylindrical area, which is convenient for assembling and fixing the bullets and ensures that the axes of the bullets are kept horizontal in the process of launching the bullets in the gun barrel and at the moment of flying and impacting; the tail of the bullet is provided with a shorter cone, so that the front and back balance in the bullet launching process is kept, and the bullet is centered and impacts the calibration rod. Therefore, when the variable-section bullet beam and the large-size shaper are adopted at the same time, the excitation pulse width can be effectively increased, and the same pulse width of a plurality of groups of excitation pulses in one calibration can be ensured.
In this regard, the specific apparatus employed in the present invention is shown in FIG. 1. The high-g-value accelerometer 9 is fixed at the rod end of the calibration rod 6 by using the vacuum clamp 8, the strain gauge 7 for recording excitation pulses is adhered on the calibration rod 6, the large-size shaper 5 is adhered at the impact end of the calibration rod 6, and the air source 11 is controlled by the valve controller 10 to emit the bullet beam 2. In fig. 1 and 2, the bullet bundle 2 comprises four variable cross-section bullets a12, B13, C14 and D15 with the same geometric configuration, and the sabot 3 is tightly fixed to the periphery of the bullet bundle 2 by using the hexagon socket head cap screw 4, so that the relative assembly positions of the four bullets are kept unchanged during the shooting of the bullet bundle 2.
Take four bullet bundles as an example:
referring to fig. 1, the invention adopts a titanium alloy rod with the diameter of 30mm and the length of 1200mm as a calibration rod 6, the roughness is 0.8, and the coaxiality and the straightness are controlled within 0.05mm deviation per meter. Fixing a high-g-value accelerometer 9 to be tested at the coaxial line position of the rod end of the calibration rod 6 by using a vacuum clamp 8, and sticking two 120-ohm strain gauges 7 on the calibration rod 6 at a position 600mm away from the rod end; a stainless steel pipe with the inner diameter of 45mm and the length of 1000mm is used as a gun barrel 1, the inner wall of the pipe is ground and polished, and the coaxiality and the straightness are controlled within 0.05mm deviation per meter. The gun barrel 1 and the calibration rod 6 are arranged and adjusted on the same axis, the rear part of the gun barrel 1 is connected with a manual quick-response valve controller 10 with an inlet and outlet aperture of 45mm, and then the valve controller 10 is connected with an air chamber by a metal pipe with the inner diameter of 45mm to be used as an air source 11 and is resistant to pressure of 1 MPa. The large-size shaper 5 adopts an aluminum alloy cushion block with the diameter of 28mm and the thickness of 15 mm. Referring to fig. 2, a bullet bundle 2 is made of high-strength steel, different bullets are in sliding fit, the maximum outer diameter is 28mm, the total length is 100mm, the assembly positions of the two bullets are tightened by using hexagon socket head cap bolts 4 and a bullet holder 3 made of polytetrafluoroethylene materials according to requirements, after the bullets are placed into a gun barrel 1, when the pressure of an air source 11 reaches a preset value, a valve controller 10 is opened, and the bullet bundle 2 is launched to realize impact. When the bullet is assembled in a staggered mode, the distance between the bullet at the front position and the bullet at the rear position can be estimated through the product of the bullet impact speed and the target pulse width, and if the bullet impact speed is 40m/s and the pulse width stress wave rising edge width of the target metering pulse is 200 mu s, the staggered distance between the front bullet and the rear bullet is larger than 0.8 cm.
The testing steps are as follows:
the first step is as follows: referring to fig. 2-2, four bullets a12, B13, C14 and D15 in the bullet bundle 2 are kept at the same warhead level, the bullet bundle is placed at the bottom of the barrel 1, when the air source 11 reaches a preset value, the valve controller 10 is opened, the bullet bundle 2 impacts the large-size shaper 5 and the incident rod 6, the strain gauge 7 records the strain history generated by the impact, and the accelerometer 9 with the high g value to be detected senses and outputs acceleration response pulses to obtain a first group of excitation and response data with the highest g value;
the second step is that: referring to fig. 2-3, the warhead positions of any two bullets, such as a bullet a12 and a bullet C14, on the diagonal line in the bullet bundle 2 are made to be ahead of the warhead positions of other bullets, such as a bullet B13 and a bullet D15, the bullet bundle 2 is placed at the bottom of the barrel 1, when the air source 11 reaches a preset value, the valve controller 10 is opened, the bullet bundle 2 impacts the large-size shaper 5 and the incident rod 6, the strain gauge 7 records the strain history generated by the impact, and the accelerometer 9 for the high g value to be detected senses and outputs acceleration response pulses to obtain excitation and response data with the second highest g value in a second group;
the third step: referring to fig. 2-4, the warhead of any bullet, such as bullet C14, in the bullet bundle 2 is positioned at a certain distance D before other bullets, such as bullet a12, bullet B13 and bullet D15, the bullet bundle 2 is placed at the bottom of the barrel 1, when the air source 11 reaches a preset value, the valve controller 10 is opened, the bullet bundle 2 impacts the large-size shaper 5 and the incident rod 6, the strain gauge 7 records the history of strain generated by the impact, and the accelerometer 9 for measuring the high g value senses and outputs an acceleration response pulse to obtain a third set of excitation and response data with the lowest g value;
the fourth step: and according to a linearity calculation method of the dynamic accelerometer, performing linear fitting on the three excitation pulses recorded by the strain gauge 7 to obtain response fitting parameters, and verifying three groups of response pulses output by the high-g-value accelerometer 9 by using the linear relation, thereby calibrating the dynamic linearity of the high-g-value accelerometer 9.
Claims (3)
1. A device for calibrating an accelerometer by utilizing a wide pulse generated by a variable cross-section bullet beam comprises a pneumatic launching gun barrel (1), a calibration rod (6), a strain gauge (7), a vacuum clamp (8), a high-g-value accelerometer (9), a valve controller (10) and an air source (11); the bullet beam is characterized by also comprising a bullet beam (2) for replacing a cone-head bullet and a large-size shaper (5) for replacing the shaper; the bullet bundle (2) is formed by cutting bullets with conical end parts at two ends and cylindrical middle parts into a plurality of cone structures along two orthogonal geometric symmetry planes in the axial direction, and the cylindrical middle part is provided with an annular bullet holder (3) and fixed by adopting an inner hexagon bolt (4); the large-size shaper (5) adopts an aluminum alloy cushion block with the diameter of 28mm and the thickness of 15 mm;
the bullet bundle (2) is made of high-strength steel;
the plurality of cone structures are four cones and comprise an A bullet (12), a B bullet (13), a C bullet (14) and a D bullet (15); the A bullet (12), the B bullet (13), the C bullet (14) and the D bullet (15) are in sliding fit.
2. The device for calibrating the accelerometer by generating the wide pulse by the bullet beam with the variable cross section according to claim 1, wherein: the annular bullet holder (3) is made of polytetrafluoroethylene materials.
3. A method for testing a device for calibrating an accelerometer by using a variable cross-section bullet beam to generate wide pulses according to any one of claims 1-2, comprising the following steps:
step 1: the warheads of 4 bullets in the bullet bundle (2) are level and level, the bullet bundle is placed at the bottom of the gun barrel (1), when the air source (11) reaches a preset value, the valve controller (10) is opened, the bullet bundle (2) impacts the large-size shaper (5) and the incident rod (6), the strain gauge (7) records the strain history generated by impact, the accelerometer (9) for detecting the high g value senses and outputs acceleration response pulses, and excitation and response data of a first group with the highest g value are obtained;
step 2: the method comprises the following steps that the distance d is that the warhead of any bullet in a bullet bundle (2) is close to the distance of other bullets, the bullet bundle (2) is placed at the bottom of a gun barrel (1), a valve controller (10) is opened when an air source (11) reaches a preset value, the bullet bundle (2) impacts a large-size shaper (5) and an incident rod (6), a strain gauge (7) records strain history generated by impact, an accelerometer (9) for measuring the g value is used for sensing and outputting acceleration response pulses, and excitation and response data of a third group with the lowest g value are obtained;
and step 3: enabling the warheads of any two bullets on the diagonal in the bullet bundle (2) to be close to other bullets by a distance d, placing the bullet bundle (2) at the bottom of the gun barrel (1), opening a valve controller (10) when an air source (11) reaches a preset value, enabling the bullet bundle (2) to impact a large-size shaper 5 and an incident rod (6), recording the history of strain generated by impact by a strain gauge (7), sensing and outputting acceleration response pulses by an accelerometer (9) to be measured to obtain a 2 nd group of excitation and response data with the 2 nd highest g value;
and 4, step 4: according to a calculation method of the linearity of the dynamic accelerometer, 4 times of excitation pulses recorded by the strain gauge (7) are subjected to linear fitting to obtain fitting parameters of response, and 4 groups of response pulses output by the high-g-value accelerometer (9) are verified by using a linear relation, so that the dynamic linearity of the high-g-value accelerometer (9) is calibrated.
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