Performance capability test system and test method

Abstract

The invention relates to a power capability testing system and a testing method, belongs to the technical field of power capability testing, and solves the problem that the impulse of metal particle composite charge is difficult to test in the prior art. The work-doing capacity testing system comprises a work-doing testing device, a dynamic data acquisition system, a data processing system, a pressure sensor and a speed acquisition system, the acting testing device is used for collecting the number of metal particles acting on the piston sliding block and the motion acceleration of the piston sliding block; the pressure sensor can be used for monitoring a shock wave pressure value; the speed acquisition system is used for monitoring the movement speed when metal particles hit the piston sliding block; the dynamic data acquisition system can record the waveform and pressure data of a test signal; and the data processing system is used for processing and calculating data obtained by the test. According to the invention, the coupling power capability test of the impact pressure and the metal particles is realized, and the test result is high in reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of work testing, and in particular to a work capacity testing system and a testing method. Background Art

[0002] At present, the impulse characterization problem under the coupling loading of submillimeter heavy metal particle groups and shock waves is mainly characterized by the deformation deflection parameters of target plates such as cantilever beams and metal sheets. Although this type of characterization method can quantitatively analyze the coupling effect under different loading conditions.

[0003] However, there are the following deficiencies in obtaining impulse values ​​under complex gas-solid two-phase flow coupling loading:

[0004] 1) Although the deformation deflection of target plates such as cantilever beams and metal sheets can characterize the coupling effect through deflection characteristic parameters, the coupling impulse value cannot be directly obtained, which limits the study of impulse models under the coupling loading of heavy metal particles and shock waves.

[0005] 2) The deformation deflection value of target plates such as cantilever beams and metal sheets ignores the reaction force after material deformation and the influence of shock wave turbulence. The maximum deflection is not observed after the test.

[0006] Therefore, it is necessary to provide a work test device and a test method for metal particle composite charges to realize the study of the impulse model under the coupling loading of heavy metal particles and shock waves. Summary of the invention

[0007] In view of the above analysis, the present invention aims to provide a work capacity testing system and a testing method to solve the problem that the existing work testing devices are difficult to implement the work testing of metal particle composite charges.

[0008] The purpose of the present invention is mainly achieved through the following technical solutions:

[0009] A work test device comprises: a counting sticker, a piston slider, a metal shell and an acceleration sensor;

[0010] The counting sticker is used to record the number of metal particles hitting the piston slider;

[0011] The acceleration sensor is installed at the end of the piston slider and is used to record the movement acceleration of the piston slider after being impacted;

[0012] The piston slider is slidably mounted in the metal shell.

[0013] Furthermore, the counting sticker is pasted on the front end of the piston slider.

[0014] Furthermore, the metal shell includes: a cylindrical shell, a fixed base and a rear cavity shell; the cylindrical shell and the rear cavity shell are fixedly installed on the front and rear sides of the fixed base respectively.

[0015] Furthermore, the cylindrical shell comprises: an end cover and a piston mounting cylinder; the end cover is fixedly connected to the fixed base; and the piston slider is slidably mounted inside the piston mounting cylinder of the cylindrical shell.

[0016] Furthermore, a sensor mounting hole is provided at the rear end of the piston slider, and the acceleration sensor is fixedly mounted in the sensor mounting hole.

[0017] Furthermore, a pressure relief circular hole is provided in the middle of the rear cavity shell.

[0018] Furthermore, it also includes: a fixed platform, a center rod, a support rod and a base; the metal shell is fixedly installed on the upper end of the fixed platform; the upper and lower ends of the center rod are respectively connected to the fixed platform and the support rod, and the bottom of the support rod is fixedly provided with a base; the base is fixed to the ground with self-tapping screws.

[0019] A working capacity testing system for metal particle composite charge comprises: a working test device, a dynamic data acquisition system, a data processing system, a pressure sensor and a speed acquisition system; the working test device is used to collect the number of metal particles that do work on a piston slider and the movement acceleration of the piston slider; the pressure sensor can be used to monitor the shock wave pressure value; the speed acquisition system is used to monitor the movement speed of metal particles when they hit the piston slider; the dynamic data acquisition system can record the waveform and pressure data of the test signal; the data processing system is used to process and calculate the data obtained from the test.

[0020] Furthermore, it also includes: a charge amplifier; the charge amplifier is used to amplify the charge signal and convert it into a voltage signal.

[0021] A method for testing the working capacity of a metal particle composite charge, using the working capacity testing system; the working capacity testing method comprises the following steps:

[0022] Step S1: preparing a composite charge and an equivalent charge without adding metal particles; installing the work test device, and connecting an acceleration sensor to the dynamic data acquisition system and the data processing system; installing a pressure sensor or a velocity acquisition system, and connecting it to the dynamic data acquisition system and the data processing system;

[0023] Step S2: respectively detonating the same charge and the composite charge with added metal particles;

[0024] Step S3: the acceleration sensor records the acceleration curve of the piston slider under the action of the same charge and the acceleration curve of the piston slider under the action of the composite charge; the pressure sensor collects the shock wave pressure data under the action of the same charge; the velocity acquisition system collects the velocity v when the metal particles impact the piston slider;

[0025] Step S4: Calculate the impulse value I of the same charge according to the acceleration curve of the piston slider under the same charge collected in step S3 r At the same time, the impulse I of the same charge is calculated based on the shock wave pressure data obtained by the pressure sensor i ; Comparison I r and I i , the difference between the two and I i When the ratio is less than or equal to 5%, the data measured by the work test device is considered valid;

[0026] Step S5: Under the action of the composite charge, the number of metal particles impacting the piston slider recorded by the counting sticker is N, the speed of the metal particles impacting the piston slider recorded by the velocity acquisition system is v, the mass of the metal particles is m, and the impulse of the metal particles on the piston slider is I p =Nmv, then the sum of the impulses of the composite charge's shock wave and the metal particles' coupling is I = I i +I p At the same time, according to the acceleration curve of the piston slider under the action of the composite charge, the shock wave of the composite charge and the coupled impulse of the metal particles on the piston slider can be calculated as I'. By comparing I and I', the difference between the two △I = |I'-I|, and the difference △I is ratioed to I. When the ratio is less than or equal to 10%, it is considered that the measurement result of the work test device is accurate, and the work test device can be used independently to test the work capacity of the composite charge.

[0027] The technical solution of the present invention can achieve at least one of the following effects:

[0028] 1. The work test system of the metal particle composite charge of the present invention can record the number of metal particles hitting the piston slider by sticking a counting sticker on the end of the piston slider, and at the same time measure the speed when the metal particles impact the piston slider, so as to calculate the impulse of the metal particles on the piston slider.

[0029] 2. The working capacity testing system of the metal particle composite charge of the present invention can collect shock wave pressure data through a pressure sensor and can collect acceleration information of the piston slider through an acceleration sensor, and can further calculate the impulse data under the coupled loading of shock wave and metal particles.

[0030] 3. The working capacity testing method of the metal particle composite charge of the present invention adopts the method of measuring the acceleration of the piston slider to calculate the working capacity of the composite charge, and simultaneously adopts the metal particle counting and speed measurement in conjunction with the pressure sensor to monitor the shock wave pressure to calculate the working capacity under the coupled loading of the metal particles and the shock wave. When the results of the two groups of measurement methods are compared and the difference is less than a preset ratio, it is considered that the accuracy of the monitoring result meets the requirements. The present invention adopts dual-channel monitoring of the working capacity of the composite charge, which can not only obtain the impulse data under the coupled loading of the shock wave and the metal particles, but also ensure the validity and accuracy of the test results.

[0031] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0033] Figure 1 A system for testing the working ability of the metal particle composite charge of the present invention;

[0034] Figure 2 It is a schematic diagram of the structural composition of the work test device of the present invention;

[0035] Figure 3 It is a cross-sectional effect diagram of the work test device of the present invention;

[0036] Figure 4 An exploded view of the work test device of the present invention;

[0037] Figure 5 The slider assembly of the work test device of the present invention is in a state where the ball is not installed;

[0038] Figure 6 A partial enlarged view of the ball mounting bracket of the work test device of the present invention;

[0039] Figure 7 The slider assembly-ball installation state of the work test device of the present invention;

[0040] Figure 8 A schematic diagram of the structural composition of a cylindrical shell of a work test device of the present invention;

[0041] Fig. 9 for Figure 8The front view of the cylindrical shell in FIG.

[0042] Fig.10 It is a structural schematic diagram of a block of the work test device of the present invention;

[0043] Fig.11 It is a schematic diagram of the shock wave overpressure-time curve at the same explosion distance;

[0044] Fig.12 It is a schematic diagram of the acceleration-time curve when the shock wave acts alone on the test device;

[0045] Fig.13 Schematic diagram of the acceleration-time curve when a submillimeter heavy metal particle group couples with a shock wave.

[0046] Reference numerals:

[0047] 1. Composite charge; 11. Fuze; 12. Heavy metal particle embedding; 13. Cartridge; 2. Work test device; 2-1. Counting sticker; 2-2. Piston slider; 2-3. Cylindrical shell; 2-4. Fixed base; 2-5. Rear cavity shell; 2-6. Elastic buffer pad; 2-7. Acceleration sensor; 2-8. Fixed platform; 2-9. Fixing bolt; 2-10. Center rod; 2-11 Support rod; 2-12. Base; 2-13. Block; 3. Charge amplifier; 4. Dynamic data acquisition system; 5. Data processing system; 6. Trigger device;

[0048] 2-21, circular slider; 2-22, piston rod; 2-23, ball support rod; 2-24, ball mounting block; 2-25, ball mounting groove; 2-26, ball; 2-27 sensor mounting hole; 2-28, ball limit beam;

[0049] 2-31, end cover; 2-32, piston mounting cylinder; 2-33, blocking groove; 2-34, ball guideway; 2-35, sensor through hole; 2-36, buffer pad mounting groove; 2-37, strip slot; 2-38, pressure relief hole; 2-51, pressure relief circular hole. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0051] Example 1

[0052] A specific embodiment of the present invention discloses a work test device, such as Figure 2 , Figure 3 , Figure 4As shown, it includes: a counting sticker 2-1, a piston slider 2-2, a metal shell and an acceleration sensor 2-7; the counting sticker 2-1 is used to record the number of metal particles hitting the piston slider 2-2; the acceleration sensor 2-7 is installed at the end of the piston slider 2-2, and is used to record the movement acceleration of the piston slider 2-2 after being impacted; the piston slider 2-2 is slidably installed in the metal shell.

[0053] Furthermore, the counting sticker 2-1 is attached to the front end of the piston slider 2-2. During implementation, since the counting sticker 2-1 is thin and has low strength, high-speed flying metal particles can easily penetrate the counting sticker 2-1, and the number of metal particles can be counted by counting the holes left on the counting sticker 2-1 after being penetrated by the metal particles.

[0054] Specifically, the counting sticker 2-1 is a circular sticker. The counting sticker 2-1 is used to collect the number of metal particles that have landed on the target; the metal particles are a group of sub-millimeter heavy metal particles.

[0055] Furthermore, the diameter of the counting sticker 2-1 is equal to the diameter of the piston slider 2-2.

[0056] In this embodiment, Figure 2 , Figure 3 As shown, the metal shell includes: a cylindrical shell 2-3, a fixed base 2-4 and a rear cavity shell 2-5; the cylindrical shell 2-3 and the rear cavity shell 2-5 are fixedly installed on the front and rear sides of the fixed base 2-4 respectively.

[0057] Furthermore, if Figure 2 As shown, the cylindrical shell 2-3, the fixed base 2-4 and the rear cavity shell 2-5 are fixed as a whole by fixing bolts 2-9. That is, a cylindrical shell 2-3 is installed at the front end of the fixed base 2-4, and the cylindrical shell 2-3 is used to provide an installation space and a displacement track for the piston slider 2-2; a rear cavity shell 2-5 is installed at the rear end of the fixed base 2-4 to prevent the impact of shock wave turbulence and maintain the overall center of gravity stability; and the rear cavity shell 2-5 can provide a space for the piston slider 2-2 to move backward after being impacted.

[0058] In a specific embodiment of the present invention, Figure 5 , Figure 6 , Figure 7As shown, the piston slider 2-2 includes: a circular slider 2-21, a ball assembly, a ball support rod 2-23 and a piston rod 2-22; wherein, the diameter of the circular slider 2-21 is equal to the inner diameter of the piston mounting cylinder 2-32, and the circular slider 2-21 can slide along the axial direction of the piston mounting cylinder 2-32; the rear end of the circular slider 2-21 is fixedly connected with the piston rod 2-22, the diameter of the piston rod 2-22 is smaller than the diameter of the circular slider 2-21, and the piston rod 2-22 is coaxially arranged with the circular slider 2-21.

[0059] Specifically, the sensor mounting hole 2-27 is arranged at the tail end of the piston rod 2-2. Figure 7 shown.

[0060] Furthermore, a plurality of ball support rods 2-23 are fixedly arranged on the circumferential side surface of the piston rod 2-22, the ball support rods 2-23 are arranged perpendicular to the piston rod 2-22, and a ball assembly is installed at the end of the ball support rod 2-23, and the ball assembly can roll along the ball slide 2-34 of the cylindrical shell 2-3, thereby realizing the linear displacement of the piston slider 2-2 relative to the cylindrical shell 2-3. Specifically, at least two groups of ball support rods 2-23 are arranged on the cylindrical surface of the piston rod 2-22, each group of four ball support rods 2-23, and the four ball support rods 2-23 are arranged at 90° intervals in the circumferential direction of the piston rod 2-22, such as Figure 5 shown.

[0061] In this embodiment, multiple groups of ball support rods 2-23 and ball assemblies are provided, and their function is to convert the linear sliding motion of the piston slider 2-2 into a motion mode combining the sliding of the circular slider 2-21 and the rolling of the ball assembly. On the one hand, it can reduce the loss of kinetic energy due to friction to ensure the accuracy of the test results. On the other hand, the ball assembly and the ball support rod 2-23 can limit the motion trajectory to avoid tilting or jamming of the piston slider 2-2, and ensure the smoothness of the linear displacement of the piston slider 2-2 relative to the cylindrical shell 2-3, thereby improving the test accuracy.

[0062] Specifically, Figure 6 As shown, the ball assembly includes: a ball 2-26, a ball mounting block 2-24 and a ball limiting beam 2-28; an arc-shaped ball mounting groove 2-25 is arranged above the ball mounting block 2-24, and two ball limiting beams 2-28 are fixedly connected to the upper end of the ball mounting groove 2-25, and the ball 2-26 is arranged in the ball mounting groove 2-25, and cannot be separated from the ball mounting groove 2-25 under the limiting action of the ball limiting beam 2-28; that is, the ball 2-26 is nested and installed in the cavity structure composed of the ball mounting block 2-24 and the ball limiting beam 2-28, and can roll in the cavity composed of the two.

[0063] Preferably, two balls 2-26 are installed in the ball installation groove 2-25. Figure 7 , Figure 8 shown.

[0064] During implementation, when the circular slider 2-21 is displaced by impact, the ball 2-26 can roll in the ball mounting groove 2-25 and simultaneously roll along the inner surface of the ball slide 2-34, and then the ball mounting block 2-24 can slide along the ball slide 2-34. In this embodiment, the ball 2-26 is contacted and rolled with the ball slide 2-34 opened inside the cylindrical shell 2-3, which can improve the smoothness of the displacement of the piston slider 2-2 after being impacted, thereby ensuring the accuracy of the test results.

[0065] Furthermore, if Figure 7 As shown, the rear end of the piston slider 2-2 is provided with a sensor mounting hole 2-27, and the acceleration sensor 2-7 is fixedly mounted in the sensor mounting hole 2-27. Preferably, the inner surface of the sensor mounting hole 2-27 is processed with an internal thread, and the acceleration sensor 2-7 is fixedly mounted with the internal thread of the sensor mounting hole 2-27 by screwing.

[0066] Specifically, the front end of the acceleration sensor 2-7 is fixedly installed in the sensor mounting hole 2-27 at the rear end of the piston slider 2-2 by means of threaded connection, and the rear end of the acceleration sensor 2-7 is connected to the charge amplifier 3 by means of a dedicated cable.

[0067] In a specific embodiment of the present invention, Figure 8 , Fig. 9 As shown, the cylindrical shell 2-3 includes: an end cover 2-31 and a piston mounting cylinder 2-32; the end cover 2-31 is fixedly connected to the fixed base 2-4; the piston slider 2-2 is slidably installed inside the piston mounting cylinder 2-32 of the cylindrical shell 2-3.

[0068] Furthermore, if Figure 3 , Figure 4 , Figure 6 As shown, a cylindrical cavity is provided inside the piston mounting cylinder 2-32 to gap-match with the circular slider 2-21 at the front end of the piston slider 2-2; an annular buffer pad mounting groove 2-36 for assembling an elastic buffer pad 2-6 is provided on the inner surface of the end cover 2-31. The elastic buffer pad 2-6 is mainly used to buffer the impact between the piston slider 2-2 and the end cover 2-31 when the piston slider 2-2 moves at high speed, so as to avoid damage to the piston slider 2-2.

[0069] Since the buffer pad installation groove 2-36 is connected to the strip groove 2-37, in order to avoid affecting the smooth passage of the piston slider 2-2, in this embodiment, the elastic buffer pad 2-6 is formed by splicing multiple arcs; specifically, the elastic buffer pad 2-6 is four arc-shaped rubber strips, and the four arc-shaped rubber strips can be spliced ​​into a ring shape. Specifically, the thickness of the elastic buffer pad 2-6 is greater than the depth of the buffer pad installation groove 2-36.

[0070] Furthermore, in order to prevent submillimeter metal particles from entering the gap between the cylindrical shell 2-3 and the piston slider 2-2 and affecting the continuous acceleration of the piston slider 2-2, in this embodiment, a block groove 2-33 is provided on the front end face of the cylindrical shell 2-3, and the block groove 2-33 is connected to the ball slide 2-34 and has a size larger than the ball slide 2-34; a block 2-13 is installed in the block groove 2-33, and the block 2-13 is embedded in the block groove 2-33, which can prevent metal particles from entering the ball slide 2-34 and ensure the continuous movement and acceleration of the piston slider 2-2 after being impacted.

[0071] Specifically, Fig.10 As shown, the block 2-33 is a solid metal block, and its shape is consistent with the block groove 2-33.

[0072] Furthermore, four strip grooves 2-37 are provided in the circumferential direction of the sensor through hole 2-35 of the end cover 2-31. One end of the strip groove 2-37 is connected to the sensor through hole 2-35, and the other end is connected to the ball slideway 2-34. Figure 8 , Fig. 9 As shown; in this embodiment, a strip-shaped slot 2-37 is provided to allow the ball support rod 2-23 to pass through the end cover 2-31.

[0073] Furthermore, in order to reduce the impact of the piston slider 2-2 on the accuracy of the test result by compressing the air inside the metal shell during its movement, a pressure relief hole 2-38 is provided in the middle of the strip groove 2-37 of the end cover 2-31 in this embodiment; the pressure relief hole 2-38 is connected to the strip groove 2-37, and its diameter is greater than the width of the strip groove 2-37. Fig. 9 During implementation, the piston slider 2-2 moves at a high speed along the axial direction of the cylindrical shell 2-3, and when the piston rod 2-22 and the ball support rod 2-23 pass through the sensor through hole 2-35 and the strip groove 2-37, the piston mounting cylinder 2-32 and the internal space of the rear cavity shell 2-5 can be connected through the pressure relief hole 2-38, thereby achieving air circulation and internal air pressure stability.

[0074] In a specific embodiment of the present invention, Figure 3As shown, a pressure relief circular hole 2-51 is provided in the middle of the rear cavity shell 2-5; when the piston slider 2-2 moves backward at high speed, the gas inside the metal shell is pushed to be discharged from the pressure relief circular hole 2-51, thereby avoiding the accuracy of the test result being affected by the change of the internal air pressure outside the metal.

[0075] Furthermore, in this embodiment, in order to reduce the resistance during the movement process, the inner cavity surface where the cylindrical shell 2-3 contacts the piston slider 2-2 is nickel-plated to improve the smoothness of the inner surface of the cylindrical shell 2-3 and reduce the friction resistance of the piston slider 2-2.

[0076] Furthermore, the metal shell is supported and fixed by a support assembly, and the height of the support assembly is adjustable, thereby being able to adjust the height of the piston slider 2-2 to be consistent with the charge to be tested.

[0077] In a specific embodiment of the present invention, Figure 2 As shown, the work test device 2 also includes: a fixed platform 2-8, a center rod 2-10, a support rod 2-11 and a base 2-12. Specifically, the fixed base 2-4 is fixedly mounted on the upper end of the fixed platform 2-8 by welding or bolts.

[0078] Specifically, the upper and lower ends of the center rod 2-10 are respectively connected to the fixed platform 2-8 and the support rod 2-11. In order to achieve the adjustable height of the work test device 2, the center rod 2-10 and the fixed platform 2-8 and the support rod 2-11 are assembled with transition-fit steel pipes that are socketed with each other, and the connection between the center rod 2-10 and the fixed platform 2-8 and the connection between the center rod 2-10 and the support rod 2-11 are both machined with center straight grooves and fastened with bolts.

[0079] Specifically, a base 2-12 is fixedly provided at the bottom of the support rod 2-11; the support rod 2-11 and the base 2-12 are connected by threads. At the same time, in order to prevent the work test device 2 from moving under the coupling of the shock wave and the particle group, in this embodiment, four through holes are opened in the circumferential direction of the base 2-12, and self-tapping screws are installed in the through holes to fix it to the ground.

[0080] Example 2

[0081] This embodiment provides a system for testing the performance of a work unit. Figure 1As shown, it includes: the work test device 2 described in Example 1, the dynamic data acquisition system 4, the data processing system 5, the pressure sensor and the speed acquisition system; the work test device 2 is used to collect the number of metal particles that work on the piston slider 2-2 and the movement acceleration of the piston slider 2-2; the pressure sensor is used to monitor the shock wave pressure data. The speed acquisition system is used to monitor the movement speed of the metal particles when they hit the piston slider 2-2; the dynamic data acquisition system 4 can record the waveform and pressure data of the test signal; the data processing system 5 is used to process and calculate the data obtained from the test.

[0082] Furthermore, it also includes: a charge amplifier 3; the charge amplifier 3 is used to amplify the charge signal and convert it into a voltage signal. Specifically, the charge amplifier 3 is electrically connected to the acceleration sensor 2-7, and is used to convert the charge signal collected by the acceleration sensor 7 into a voltage signal and convert it into acceleration information through the data processing system 5.

[0083] In this embodiment, the test data acquisition is completed by the charge amplifier 3, the dynamic data acquisition system 4, and the data processing system 5. The charge amplifier 3 can amplify the tiny charge signal and filter out the noise to convert it into a voltage signal; the dynamic data acquisition system 4 has a built-in hard disk and a transient sampling frequency of up to 10MHz, which is used to record the waveform of the test signal; the data processing system 5 processes and calculates the waveform data obtained in the test to obtain the impulse value under the coupling loading of the submillimeter heavy metal particle group and the shock wave, thereby providing reliable test results for the functional capacity characterization and evaluation of the composite charge.

[0084] Example 3

[0085] A specific embodiment of the present invention provides a method for testing work capacity, which uses the work testing system described in Example 2 for testing.

[0086] In this embodiment, the functional capacity testing method comprises the following steps:

[0087] Step S1: preparing a composite charge and an equivalent charge without adding metal particles; installing the work test device 2, and connecting the acceleration sensors 2-7 to the dynamic data acquisition system 4 and the data processing system 5; installing a pressure sensor or a velocity acquisition system, and connecting it to the dynamic data acquisition system 4 and the data processing system 5;

[0088] Step S2: respectively detonating the same charge and the composite charge with added metal particles;

[0089] Step S3: the acceleration sensor 2-7 records the motion acceleration curve of the piston slider 2-2 under the action of equal charge and the motion acceleration curve of the piston slider 2-2 under the action of composite charge; the pressure sensor collects shock wave pressure data under the action of equal charge; the velocity acquisition system collects the velocity v when the metal particles impact the piston slider 2-2;

[0090] Step S4: Calculate the impulse value I of the same charge according to the acceleration curve of the piston slider 2-2 under the same charge collected in step S3. r At the same time, the impulse I of the same charge is calculated based on the pressure data obtained by the pressure sensor i ; Comparison I r and I i , the difference between the two and I i When the ratio is less than or equal to 5%, the data measured by the work test device 2 is considered valid;

[0091] Step S5: Under the action of the composite charge, the number of metal particles impacting the piston slider 2-2 recorded by the counting sticker 2-1 is N, the speed of the metal particles impacting the piston slider 2-2 recorded by the velocity acquisition system is v, the mass of the metal particles is m, and the impulse of the metal particles on the piston slider 2-2 is I. p =Nmv, then the sum of the impulses of the composite charge's shock wave and the metal particles' coupling is I = I i +I p At the same time, according to the acceleration curve of the piston slider 2-2 under the action of the composite charge 1, the shock wave of the composite charge 1 and the coupled impulse of the metal particles on the piston slider 2-2 can be calculated as I'. By comparing I and I', the difference △I between the two is = |I'-I|. The difference △I is ratioed to I. When the ratio is less than or equal to 10%, it is considered that the measurement result of the work test device 2 is accurate, and the work test device 2 can be used independently to test the work capacity of the composite charge 1.

[0092] In step S1 of the present embodiment, a composite charge is designed and manufactured according to the test plan; specifically, the composite charge 1 includes: a fuse 11, a heavy metal particle embedding layer 12 and a core 13; a core 13 is provided inside the heavy metal particle embedding layer 12, the core 13 is connected with the fuse 11, and the fuse 11 is connected to the trigger device 6; the trigger device 6 is used to ignite the fuse 11, and then ignite the core 13; the core 13 can drive the metal particles of the heavy metal particle embedding layer 12 to be loaded to the maximum speed.

[0093] Furthermore, the heavy metal particle embedding layer 12 is an annular particle layer formed by pressing sub-millimeter spherical tungsten carbide, a binder, a combustion aid, etc. by a mold pressing process, and the heavy metal particle embedding layer 12 is integrally embedded around the core 13. After the core 13 is ignited, the spherical tungsten carbide of the heavy metal particle embedding layer 12 will fly out at a high speed, and then some metal particles will impact the piston slider 2-2 to do work on it.

[0094] In step S1 of the present embodiment, a plurality of the working test devices 2 are grouped together, and a group of the working test devices 2 is installed at the same distance as the equal charge or composite charge 1; the plurality of groups of the working test devices 2 are arranged from far to near and fixed at the same height as the equal charge or composite charge 1.

[0095] At the same time, the pressure sensor is fixed on the concentric rings where the multiple groups of work test devices 2 are located, and at the same height as the composite charge.

[0096] Furthermore, the pressure sensor is a PCB pressure sensor; the speed acquisition system is used to collect the instantaneous speed of the front of heavy metal particles; at the same time, the dynamic data acquisition system 4 is set to be in a trigger state. Preferably, the speed acquisition system uses a high-speed camera to collect the speed of metal particles when they impact the piston slider 2-2.

[0097] In step S1 of the present embodiment, when testing the working capacity of the composite charge 1, multiple groups of the working test devices 2 are fixed at the same height as the composite charge 1, and the distance between the two is 1.42m; at the same time, the velocity acquisition system is set on the side of the working test device 2 and perpendicular to the connection line between the working test device 2 and the composite charge 1.

[0098] Furthermore, in step S1, the velocity acquisition system is a high-speed camera, and the lens direction of the high-speed camera is perpendicular to the line between the working test device 2 and the composite charge 1; or in other words, the lens direction of the high-speed camera is set along the tangent direction of the circle surrounded by multiple working test devices 2.

[0099] In the step S1, the acceleration sensors 2-7, the pressure sensors, the speed acquisition system, the charge amplifier 3, the dynamic data acquisition system 4, and the data processing system 5 are connected accordingly, and the dynamic data acquisition system 4 is set to a trigger state. In this embodiment, the connection mode between the sensor and the charge amplifier 3, the dynamic data acquisition system 4, and the data processing system 5, and the selection and working principle of the charge amplifier 3, the dynamic data acquisition system 4, and the data processing system 5 are all well known to those skilled in the art, and will not be repeated in this embodiment.

[0100] In step S2, the trigger device 6 is used to ignite the fuse 11, thereby detonating the composite charge 1 or an equivalent charge without metal particles;

[0101] In step S3, after the composite charge 1 is ignited, the metal particle group of the heavy metal particle embedding layer 12 is accelerated to the maximum speed under the detonation driving action of the core 13 and flies toward the piston slider 2-2. When the metal particle group and the shock wave are loaded on the piston slider 2-2 together, the counting sticker 2-1 can record the number of metal particles, and the speed acquisition system can monitor the speed of the metal particles when they hit the piston slider 2-2; the piston slider 2-2 accelerates backward as a whole, and the acceleration is monitored by the acceleration sensor 2-7 to obtain the acceleration curve of the piston slider 2-2 under coupled loading, and obtain the maximum acceleration.

[0102] In step S3, the pressure sensor can obtain the shock wave overpressure-time curve at the same distance as the work test device 2, such as Fig.11 shown.

[0103] In step S3, when the work done by the same charge is carried out, after the shock wave is loaded on the front end surface of the piston slider 2-2, the piston slider 2-2 accelerates backward as a whole, and the acceleration sensor 2-7 responds to obtain the acceleration curve of the piston slider 2-2 as a whole under the shock wave loading alone, such as Fig.12 As shown; when the composite charge 1 does work, the metal particle group is accelerated to the maximum speed under the driving action of the shock wave and flies toward the piston slider 2-2. The shock wave and the high-speed metal particles are simultaneously loaded on the front end surface of the piston slider 2-2, and the piston slider 2-2 accelerates backward as a whole. The acceleration sensor 2-7 responds to obtain the acceleration curve of the piston slider 2-2 as a whole under the coupling loading of the shock wave and the metal particles, as shown in FIG. Fig.13 shown.

[0104] In this embodiment, the pressure sensor only tests the shock wave pressure curve of the same charge, and does not directly contact the high-speed impact of metal particles, thereby preventing high-speed moving metal particles from damaging the pressure sensor and causing distortion of the test results or excessive wear of the pressure sensor, thereby extending the service life of the pressure sensor and saving costs.

[0105] In this embodiment, the acceleration sensor 2-7 is installed inside the metal shell and located at the tail end of the piston slider 2-2. It is not directly impacted by shock waves or metal particles, which can protect the acceleration sensor 2-7, avoid damage to the acceleration sensor 2-7, extend its service life, and save costs.

[0106] In step S4, the shock wave pressure curve generated under the same charge is integrated to obtain the specific impulse value: The front end surface of the piston slider 2-2, that is, the end surface area of ​​the circular slider 2-21 is A, and the impulse value of the shock wave doing work alone calculated by the pressure data measured by the pressure sensor is: i =ii A.

[0107] In step S4, the sum of the mass of the piston slider 2-2 and the mass of the acceleration sensor 2-7 is M, and the acceleration curve measured by the acceleration sensor 2-7 is integrated to obtain the maximum movement speed V1 of the shock wave doing work on the piston slider 2-2 and the acceleration sensor 2-7 as a whole. Thus, the impulse I measured by the work test device 2 under the shock wave loading alone can be calculated. r =MV1; that is, under the shock wave loading alone, the impulse value I calculated from the pressure data measured by the pressure sensor r The impulse value I calculated from the acceleration response curve of the work test device 2 i The error is less than 5%, and the test value of the work test device 2 is considered valid.

[0108] In step S5, the mass of a single metal particle is m, the number of metal particles recorded by the counting sticker 2-1 is N, and the front velocity of the metal particles collected by the velocity collection system (the velocity before reaching the surface of the counting sticker 2-1) is v, then the total impulse of the metal particles I p =Nmv, then the sum of the impulses of the metal particle group and the shock wave under coupling loading is I = I i +I p .

[0109] In step S5, when the shock wave of the composite charge 1 and the metal particles work together, the maximum speed V2 of the piston slider 2-2 can be obtained by integrating the acceleration curve measured by the acceleration sensor 2-7. Therefore, the impulse value I' of the composite charge 1 under the coupled loading of the shock wave and the metal particles is equal to MV2.

[0110] In step S5, the impulse value I of the shock wave doing work alone i and the impulse of the metal particle group I p The error between the sum I and the impulse value I' of the composite charge 1 under the coupling loading of shock wave and metal particles measured by the work test device 2 is not greater than 10%, that is, △I / I≤10%; it is considered that the impulse test value under the coupling loading of metal particle group and shock wave obtained by the test system is accurate.

[0111] Furthermore, the test data is exported and archived through the data processing system 5 .

[0112] Furthermore, in this embodiment, the test system only uses the pressure sensor and the velocity acquisition system to assist in verifying the validity of the test results of the working test device 2 during the verification phase, and subsequent tests only use the acceleration curve collected by the acceleration sensor 2-7 of the working test device 2 to calculate the impulse value I'=MV2 of the shock wave of the composite charge 1 and the metal particle coupling loading as the test result of the composite charge 1.

[0113] That is to say, the working test device 2 uses a pressure sensor and a velocity acquisition system for auxiliary verification during the first test, and the working test device 2 can independently test the working impulse of the composite charge 1 (different ratios and types) during subsequent use.

[0114] The work test device, test system and test method of the present invention solve the difficulty of obtaining the damage impulse value of the target under the coupling loading of the heavy metal particle group driven by the metal particle composite charge explosion and the shock wave. It has strong practicality and operability, and the product structure and test method are simple and clear, the principle is clear, and it has strong applicability. This embodiment verifies the accuracy of the test result of the work test device 2 by double testing by verifying the accuracy of the work test device 2 under the independent work of the shock wave and the accuracy of the shock wave and the metal particle coupling work; and considering the high cost and easy wear of the pressure sensor and the velocity acquisition system, it is only used as an accuracy verification of the work test device 2. After the verification is completed, the work test device 2 can independently test the shock wave and metal particle coupling work capacity, and its metal shell can protect the internal acceleration sensor, extend the service life of the setting, and reduce the test cost.

[0115] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A work test device, characterized in that: include: Counting sticker (2-1), piston slider (2-2), metal shell and acceleration sensor (2-7); The counting sticker (2-1) is used to record the number of metal particles hitting the piston slider (2-2); The acceleration sensor (2-7) is installed at the end of the piston slider (2-2) and is used to record the movement acceleration of the piston slider (2-2) after being impacted; The piston slider (2-2) is slidably mounted in the metal shell.

2. The work test device according to claim 1, characterized in that: The counting sticker (2-1) is adhered to the front end of the piston slider (2-2).

3. The work test device according to claim 2, characterized in that: The metal shell comprises: a cylindrical shell (2-3), a fixed base (2-4) and a rear cavity shell (2-5); the cylindrical shell (2-3) and the rear cavity shell (2-5) are respectively fixedly mounted on the front and rear sides of the fixed base (2-4).

4. The work test device according to claim 3, characterized in that: The cylindrical shell (2-3) comprises: an end cover (2-31) and a piston mounting cylinder (2-32); the end cover (2-31) is fixedly connected to the fixed base (2-4); and the piston slider (2-2) is slidably mounted inside the piston mounting cylinder (2-32) of the cylindrical shell (2-3).

5. The work test device according to claim 1, characterized in that: A sensor mounting hole (2-27) is provided at the rear end of the piston slider (2-2), and the acceleration sensor (2-7) is fixedly mounted in the sensor mounting hole (2-27).

6. The work test device according to claim 3, characterized in that: A pressure relief circular hole (2-51) is provided in the middle of the rear cavity shell (2-5).

7. The work test device according to claim 1, characterized in that: Also includes: A fixed platform (2-8), a center rod (2-10), a support rod (2-11) and a base (2-12); the metal shell is fixedly mounted on the upper end of the fixed platform (2-8); the upper and lower ends of the center rod (2-10) are respectively connected to the fixed platform (2-8) and the support rod (2-11); and the base (2-12) is fixedly provided at the bottom of the support rod (2-11).

8. A working capacity testing system, characterized in that: include: The work test device (2), dynamic data acquisition system (4), data processing system (5), pressure sensor and velocity acquisition system as described in any one of claims 1 to 5; the work test device (2) is used to collect the number of metal particles doing work on the piston slider (2-2) and the movement acceleration of the piston slider (2-2); the pressure sensor can be used to monitor the shock wave pressure value; the velocity acquisition system is used to monitor the movement speed of the metal particles when they hit the piston slider (2-2); the dynamic data acquisition system (4) can record the waveform and pressure data of the test signal; the data processing system (5) is used to process and calculate the data obtained from the test.

9. The metal particle composite charge working capacity testing system according to claim 6, characterized in that: Also includes: A charge amplifier (3); the charge amplifier (3) is used to amplify the charge signal and convert it into a voltage signal.

10. A method for testing functional capacity, characterized in that: The working capacity testing system according to claim 8 or 9 is used; the working capacity testing method comprises the following steps: Step S1: preparing a composite charge and an equivalent charge without adding metal particles; installing the work test device (2), and connecting the acceleration sensor (2-7) to the dynamic data acquisition system (4) and the data processing system (5); installing a pressure sensor or a velocity acquisition system, and connecting it to the dynamic data acquisition system (4) and the data processing system (5); Step S2: igniting the same charge and the composite charge with added metal particles respectively; Step S3: the acceleration sensor (2-7) records the motion acceleration curve of the piston slider (2-2) under the action of equal charge and the motion acceleration curve of the piston slider (2-2) under the action of composite charge; the pressure sensor collects shock wave pressure data under the action of equal charge; the velocity acquisition system collects the velocity v when the metal particles impact the piston slider (2-2); Step S4: Calculate the impulse value I of the same charge according to the acceleration curve of the piston slider (2-2) under the action of the same charge collected in step S3. r At the same time, the impulse I of the same charge is calculated based on the pressure data obtained by the pressure sensor i ; Comparison I r and I i , the difference between the two and I i When the ratio is less than or equal to 5%, the data measured by the work test device (2) is considered valid; Step S5: Under the action of the composite charge, the number of metal particles impacting the piston slider (2-2) recorded by the counting sticker (2-1) is N, the speed of the metal particles impacting the piston slider (2-2) recorded by the speed acquisition system is v, the mass of the metal particles is m, and the impulse of the metal particles on the piston slider (2-2) is I p =Nmv, then the sum of the impulses of the composite charge's shock wave and the metal particles' coupling is I = I i +I p At the same time, according to the acceleration curve of the piston slider (2-2) under the action of the composite charge (1), the shock wave of the composite charge (1) and the coupled impulse of the metal particles on the piston slider (2-2) can be calculated as I', and I and I' are compared. The difference △I between the two is = |I'-I|. The difference △I is ratioed to I. When the ratio is less than or equal to 10%, it is considered that the measurement result of the work test device (2) is accurate, and the work test device (2) can be used independently to test the work capacity of the composite charge (1).

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