A system and method for testing functional capability

Abstract

The present application relates to a kind of doing function power test system and test method, belong to doing function power test technical field, solve the problem that the impulse of metal particle composite charge is difficult to test in prior art.The doing function power test system of the present application, comprising: doing test device, dynamic data acquisition system, data processing system, pressure sensor and speed acquisition system;The doing test device is used to acquire the number of metal particles to the piston slide doing work and the motion acceleration of piston slide;The pressure sensor can be used to monitor shock wave pressure value;The speed acquisition system is used to monitor the motion speed when metal particle hits the piston slide;The dynamic data acquisition system can record the waveform and pressure data of test signal;The data processing system is used to process and calculate the data obtained by test.The present application realizes the coupling doing function power test of impact pressure and metal particle and the test result is high in reliability.

Description

Technical Field

[0001] This invention relates to the field of work performance testing technology, and more particularly to a work performance testing system and testing method. Background Technology

[0002] Currently, the impulse characterization problem under coupled loading of submillimeter-sized heavy metal particle groups and shock waves is mainly characterized by the deformation and deflection parameters of target plates such as cantilever beams and thin metal plates. Although this type of characterization method can quantitatively analyze the coupling effect under different loading conditions, it is still necessary to address the problem.

[0003] However, there are the following shortcomings in obtaining the impulse value under complex gas-solid two-phase flow coupled loading:

[0004] 1) Although the deformation deflection of target plates such as cantilever beams and thin metal plates can be characterized by deflection characteristic parameters, the coupling impulse value cannot be directly obtained, which limits the research on impulse model under coupled loading of heavy metal particles and shock waves.

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

[0006] Therefore, there is a need to provide a work testing device and method for metal particle composite charges, so as to realize the impulse model research under the coupled loading of heavy metal particles and shock waves. Summary of the Invention

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

[0008] The objective of this invention is mainly achieved through the following technical solutions:

[0009] A work performance testing device includes: a counting sticker, a piston slider, a metal housing, and an acceleration sensor;

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

[0011] The acceleration sensor is installed at the end of the piston slider and is used to record the motion acceleration of the piston slider after it is subjected to an impact.

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

[0013] Furthermore, the counting sticker is affixed to the front end of the piston slider.

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

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

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

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

[0018] Furthermore, it also includes: a fixed platform, a central 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 central 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 work performance testing system for a metal particle composite charge includes: a work performance testing device, a dynamic data acquisition system, a data processing system, a pressure sensor, and a velocity acquisition system. The work performance testing device is used to collect the number of metal particles performing work on a piston-slider and the acceleration of the piston-slider. The pressure sensor is used to monitor the shock wave pressure value. The velocity acquisition system is used to monitor the velocity of the metal particles when they hit the piston-slider. The dynamic data acquisition system is used to record the waveform and pressure data of the test signal. The data processing system is used to process and calculate the data acquired in the experiment.

[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 functional performance of a metal particle composite charge, using the aforementioned functional performance testing system; the method includes the following steps:

[0022] Step S1: Prepare composite charges and identical charges without metal particles; install the work test device and connect the acceleration sensor to the dynamic data acquisition system and data processing system; install a pressure sensor or velocity acquisition system and connect it to the dynamic data acquisition system and data processing system.

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

[0024] Step S3: The accelerometer records the acceleration curves of the piston-slider motion under the same charge and under the combined charge; the pressure sensor collects the shock wave pressure data under the same charge; the velocity acquisition system collects the velocity v of the metal particles impacting the piston-slider.

[0025] Step S4: Based on the acceleration curve of the piston-slider under the same charge collected in step S3, calculate the impulse value I of the same charge. r Simultaneously, the impulse I of the same charge is calculated based on the shock wave pressure data obtained from the pressure sensor. i Compare I r and I i The difference between the two is compared with I. i The data measured by the work test device is considered valid if the ratio is less than or equal to 5%.

[0026] Step S5: Under the action of the composite charge, the counting sticker records the number of metal particles impacting the piston slider as N, the velocity acquisition system records the velocity of the metal particles impacting the piston slider as v, the mass of the metal particles as m, and the impulse of the metal particles on the piston slider as I. p =Nmv, then the sum of the impulses of the shock wave and the metal particles coupled together by the composite charge is I = I i +I p Simultaneously, based on the acceleration curve of the piston slider under the action of the composite charge, the coupling impulse of the shock wave of the composite charge and the metal particles on the piston slider can be calculated as I'. Comparing I and I', the difference between the two is ΔI = |I' - I|. When the difference ΔI is compared with I, and the ratio is less than or equal to 10%, the measurement result of the work test device is considered to be accurate, and the work test device can be used independently to test the work capacity of the composite charge.

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

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

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

[0030] 3. The method for testing the work capacity of the metal particle composite charge of the present invention calculates the work capacity of the composite charge by measuring the acceleration of the piston slider. At the same time, it calculates the work capacity under coupled loading of metal particles and shock wave by counting and measuring the velocity of metal particles and monitoring the shock wave pressure with a pressure sensor. The results of the two measurement methods are compared. If the difference is less than a preset ratio, the accuracy of the monitoring result is considered to meet the requirements. The present invention uses dual-channel monitoring of the work capacity of the composite charge, which can not only obtain the impulse data under coupled loading of shock wave and metal particles, but also ensure the validity and accuracy of the test results.

[0031] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0032] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0033] Figure 1 This invention provides a functional testing system for the metal particle composite charge of the present invention.

[0034] Figure 2 This is a schematic diagram of the structural composition of the work performance testing device of the present invention;

[0035] Figure 3 This is a cross-sectional view of the work performance testing device of the present invention;

[0036] Figure 4 This is an exploded view of the work performance testing device of the present invention;

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

[0038] Figure 6 This is a partial enlarged view of the ball bearing mounting bracket of the work performance testing device of the present invention;

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

[0040] Figure 8 This is a schematic diagram of the structural composition of the cylindrical shell of the work testing device of the present invention;

[0041] Figure 9 for Figure 8Front view of the cylindrical shell in the middle;

[0042] Figure 10 This is a schematic diagram of the blockage structure of the work performance testing device of the present invention;

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

[0044] Figure 12 A schematic diagram of the acceleration-time curve when the shock wave acts alone on the test device;

[0045] Figure 13 This is a schematic diagram of the acceleration-time curve when a submillimeter-sized heavy metal particle group is coupled with a shock wave.

[0046] Figure label:

[0047] 1. Composite charge; 11. Fuze; 12. Heavy metal particle intercalation; 13. Core charge; 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. Accelerometer; 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. Triggering device;

[0048] 2-21, Circular slider; 2-22, Piston rod; 2-23, Ball bearing support rod; 2-24, Ball bearing mounting block; 2-25, Ball bearing mounting groove; 2-26, Ball bearing; 2-27, Sensor mounting hole; 2-28, Ball bearing limiting beam;

[0049] 2-31 End cap; 2-32 Piston mounting cylinder; 2-33 Block groove; 2-34 Ball bearing slide; 2-35 Sensor through hole; 2-36 Buffer pad mounting groove; 2-37 Strip slot; 2-38 Pressure relief hole; 2-51 Pressure relief round hole. Detailed Implementation

[0050] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which 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 intended to limit the scope of the present invention.

[0051] Example 1

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

[0053] Furthermore, the counting sticker 2-1 is affixed to the front end of the piston slider 2-2. In practice, because the counting sticker 2-1 is thin and has low strength, high-speed flying metal particles can easily puncture it. The number of metal particles can be counted by counting the holes left on the counting sticker 2-1 after being punctured 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 hit the target; the metal particles are a sub-millimeter-sized group of 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, as Figure 2 , Figure 3 As shown, the metal outer 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 respectively fixedly installed on the front and rear sides of the fixed base 2-4.

[0057] Furthermore, such as Figure 2 As shown, the cylindrical shell 2-3, the fixed base 2-4, and the rear cavity shell 2-5 are fixed together 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 the installation space and 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 stability of the overall center of gravity; and the rear cavity shell 2-5 can provide space for the piston slider 2-2 to move backward after being impacted.

[0058] In one specific embodiment of the present invention, such as Figure 5 , Figure 6 , Figure 7As shown, the piston slider 2-2 includes: a circular slider 2-21, a ball bearing assembly, a ball bearing 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 to 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 and the circular slider 2-21 are coaxially arranged.

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

[0060] Furthermore, a plurality of ball bearing support rods 2-23 are fixedly disposed on the circumferential side of the piston rod 2-22. The ball bearing support rods 2-23 are perpendicular to the piston rod 2-22, and ball bearing assemblies are mounted at the ends of the ball bearing support rods 2-23. The ball bearing assemblies can roll along the ball bearing slide 2-34 of the cylindrical housing 2-3, thereby achieving linear displacement of the piston slider 2-2 relative to the cylindrical housing 2-3. Specifically, at least two sets of ball bearing support rods 2-23 are disposed on the cylindrical surface of the piston rod 2-22, with four rods in each set, and the four ball bearing support rods 2-23 are spaced 90° apart in the circumferential direction of the piston rod 2-22. Figure 5 As shown.

[0061] In this embodiment, multiple sets of ball bearing support rods 2-23 and ball bearing assemblies are provided. Their function is to convert the linear sliding motion of the piston slider 2-2 into a motion mode that combines the sliding of the circular slider 2-21 and the rolling of the ball bearing assembly. On the one hand, this can reduce the loss of kinetic energy due to friction and ensure the accuracy of the test results. On the other hand, the ball bearing assembly and ball bearing support rods 2-23 can limit the motion trajectory, prevent the piston slider 2-2 from tilting or jamming, 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, such as Figure 6 As shown, the ball assembly includes: ball 2-26, ball mounting block 2-24, and ball limiting beam 2-28; an arc-shaped ball mounting groove 2-25 is provided 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; the ball 2-26 is disposed in the ball mounting groove 2-25, and cannot detach from the ball mounting groove 2-25 under the limiting action of the ball limiting beams 2-28; that is, the ball 2-26 is nested in the cavity structure formed by the ball mounting block 2-24 and the ball limiting beams 2-28, and can roll within the cavity formed by the two.

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

[0064] In practice, when the circular slider 2-21 is subjected to impact displacement, the ball bearing 2-26 can roll in the ball bearing mounting groove 2-25 and simultaneously roll along the inner surface of the ball bearing slide 2-34, thereby allowing the ball bearing mounting block 2-24 to slide along the ball bearing slide 2-34. In this embodiment, the ball bearing 2-26 contacts and rolls in contact with the ball bearing slide 2-34 inside the cylindrical housing 2-3, which improves the smoothness of the piston slider 2-2's displacement after impact, thus ensuring the accuracy of the test results.

[0065] Furthermore, such as 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 installed in the sensor mounting hole 2-27. Preferably, the inner surface of the sensor mounting hole 2-27 is machined with an internal thread, and the acceleration sensor 2-7 is fixedly installed to the internal thread of the sensor mounting hole 2-27 by threaded connection.

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

[0067] In one specific embodiment of the present invention, such as Figure 8 , Figure 9 As shown, the cylindrical housing 2-3 includes: an end cap 2-31 and a piston mounting cylinder 2-32; the end cap 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 housing 2-3.

[0068] Furthermore, such as Figure 3 , Figure 4 , Figure 6 As shown, a cylindrical cavity is provided inside the piston mounting cylinder 2-32 to fit with the circular slider 2-21 at the front end of the piston slider 2-2; an annular buffer pad mounting groove 2-36 is provided on the inner surface of the end cover 2-31 to assemble the elastic buffer pad 2-6. The elastic buffer pad 2-6 mainly buffers 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 mounting groove 2-36 is connected to the strip slot 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 made of multiple arc-shaped pieces spliced ​​together; specifically, the elastic buffer pad 2-6 consists of four arc-shaped rubber strips, and the four arc-shaped rubber strips can be spliced ​​together to form a ring. Specifically, the thickness of the elastic buffer pad 2-6 is greater than the depth of the buffer pad mounting groove 2-36.

[0070] Furthermore, to prevent submillimeter-sized 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 blocking groove 2-33 is provided on the front end face of the cylindrical shell 2-3. The blocking groove 2-33 is connected to the ball slide 2-34 and is larger in size than the ball slide 2-34. A blocking block 2-13 is installed in the blocking groove 2-33. The blocking block 2-13 is fitted into the blocking 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, such as Figure 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-shaped slots 2-37 are formed circumferentially in the sensor through-hole 2-35 of the end cap 2-31. One end of each strip-shaped slot 2-37 communicates with the sensor through-hole 2-35, and the other end communicates with the ball bearing slide 2-34. Figure 8 , Figure 9 As shown; in this embodiment, a strip-shaped slot 2-37 is provided to allow the ball bearing support rod 2-23 to pass through the end cap 2-31.

[0073] Furthermore, to reduce the impact on the accuracy of test results caused by the compression of air inside the metal casing during the movement of the piston slider 2-2, in this embodiment, a pressure relief hole 2-38 is provided in the middle of the strip-shaped slot 2-37 of the end cap 2-31; the pressure relief hole 2-38 is connected to the strip-shaped slot 2-37, and its diameter is larger than the width of the strip-shaped slot 2-37, such as... Figure 9 As shown. In implementation, the piston slider 2-2 moves at high speed along the axial direction of the cylindrical housing 2-3. When the piston rod 2-22 and the ball support rod 2-23 pass through the sensor through hole 2-35 and the strip slot 2-37, they can connect the internal space of the piston mounting cylinder 2-32 and the rear cavity housing 2-5 through the pressure relief hole 2-38, thereby realizing the circulation of air and the stabilization of internal air pressure.

[0074] In one specific embodiment of the present invention, such as Figure 3As shown, a pressure relief hole 2-51 is provided in the middle of the rear cavity housing 2-5; when the piston slider 2-2 moves backward at high speed, it pushes the gas inside the metal shell to be discharged through the pressure relief hole 2-51, thereby avoiding the influence of the accuracy of the test results on the change of air pressure inside the metal shell.

[0075] Furthermore, in this embodiment, in order to reduce the resistance during the motion process, nickel plating is applied to the inner surface of the cylindrical shell 2-3 that contacts the piston slider 2-2 to improve the smoothness of the inner surface of the cylindrical shell 2-3 and reduce the frictional resistance of the piston slider 2-2.

[0076] Furthermore, the metal casing is supported and fixed by a support assembly, and the height of the support assembly is adjustable, thereby enabling the piston slider 2-2 to be aligned with the height of the charge to be tested.

[0077] In one specific embodiment of the present invention, such as Figure 2 As shown, the work test device 2 also includes: a fixed platform 2-8, a central rod 2-10, a support rod 2-11, and a base 2-12. Specifically, the fixed base 2-4 is fixedly installed 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 connected to the fixed platform 2-8 and the support rod 2-11, respectively. In order to make the height of the work test device 2 adjustable, the center rod 2-10, the fixed platform 2-8, and the support rod 2-11 are all assembled by interlocking steel pipes with transition fit. 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 all machined with straight central grooves and fastened with bolts.

[0079] Specifically, a base 2-12 is fixedly mounted on the bottom of the support rod 2-11; the support rod 2-11 and the base 2-12 are connected by threads. Meanwhile, to prevent the work test device 2 from moving under the coupling effect 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 performing functional ability testing, such as... Figure 1As shown, the system 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 velocity acquisition system; the work test device 2 is used to collect the number of metal particles doing work on the piston slider 2-2 and the acceleration of the piston slider 2-2; the pressure sensor is used to monitor the shock wave pressure data. The velocity acquisition system is used to monitor the velocity 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 acquired in the experiment.

[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 then into acceleration information through the data processing system 5.

[0083] In this embodiment, test data acquisition is accomplished by charge amplifier 3, dynamic data acquisition system 4, and data processing system 5. Charge amplifier 3 can amplify tiny charge signals and filter out noise to convert them into voltage signals. Dynamic data acquisition system 4 has a built-in hard disk and a transient sampling frequency of up to 10MHz to record the waveform of the test signal. Data processing system 5 processes and calculates the impulse value of submillimeter-level heavy metal particle groups coupled with shock wave loading by processing the waveform data acquired in the experiment, providing reliable test results for the performance characterization and evaluation of composite charges.

[0084] Example 3

[0085] In one specific embodiment of the present invention, a method for testing work capacity is provided, which uses the work capacity testing system described in Embodiment 2 for testing.

[0086] In this embodiment, the method for performing a functional ability test includes the following steps:

[0087] Step S1: Prepare composite charge and equivalent charge without metal particles; install the work test device 2 and connect the acceleration sensors 2-7 to the dynamic data acquisition system 4 and data processing system 5; install pressure sensor or velocity acquisition system and connect it to the dynamic data acquisition system 4 and data processing system 5.

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

[0089] Step S3: The acceleration sensor 2-7 records the acceleration curves of the piston slider 2-2 under the action of the same charge and the acceleration curves of the piston slider 2-2 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 of the metal particles impacting the piston slider 2-2;

[0090] Step S4: Based on the acceleration curve of the piston slider 2-2 under the same charge collected in step S3, calculate the impulse value I of the same charge. r Simultaneously, the impulse I for the same charge is calculated based on the pressure data obtained from the pressure sensor. i Compare I r and I i The difference between the two is compared with I. i If 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 counting sticker 2-1 records the number of metal particles impacting the piston slider 2-2 as N, the velocity acquisition system records the velocity of the metal particles impacting the piston slider 2-2 as v, the mass of the metal particles as m, and the impulse of the metal particles on the piston slider 2-2 as I. p =Nmv, then the sum of the impulses of the shock wave and the metal particles coupled together by the composite charge is I = I i +I p Simultaneously, based on the acceleration curve of the piston slider 2-2 under the action of the composite charge 1, the coupling impulse of the shock wave of the composite charge 1 and the metal particles on the piston slider 2-2 can be calculated as I'. Comparing I and I', the difference between the two is ΔI = |I' - I|. When the difference ΔI is compared with I, and the ratio is less than or equal to 10%, the measurement result of the work test device 2 is considered to be 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 this 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 interlayer 12, and a core 13. The core 13 is disposed inside the heavy metal particle interlayer 12, and the fuse 11 is connected to the core 13. The fuse 11 is connected to a triggering device 6. The triggering device 6 is used to ignite the fuse 11, which in turn can ignite the core 13. The core 13 can drive the metal particles of the heavy metal particle interlayer 12 to be loaded to the maximum speed.

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

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

[0095] Meanwhile, the pressure sensor is fixed on the concentric ring where multiple sets of the 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 velocity acquisition system is used to acquire the instantaneous velocity of the leading edge of the heavy metal particles; simultaneously, the dynamic data acquisition system 4 is set to a ready-to-trigger state. Preferably, the velocity acquisition system uses a high-speed camera to acquire the velocity of the metal particles impacting the piston slider 2-2.

[0097] In step S1 of this embodiment, when testing the work capacity of the composite charge 1, multiple sets of work testing devices 2 are fixed at the same height as the composite charge 1, with a distance of 1.42m between them; at the same time, the velocity acquisition system is set on the side of the work testing device 2 and perpendicular to the line connecting the work testing 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 connecting the work test device 2 and the composite charge 1; or, the lens direction of the high-speed camera is set along the tangent direction of the ring formed by the multiple work test devices 2.

[0099] In step S1, the accelerometers 2-7, pressure sensor, velocity acquisition system, charge amplifier 3, dynamic data acquisition system 4, and data processing system 5 are connected accordingly, and the dynamic data acquisition system 4 is set to a ready-to-trigger state. In this embodiment, the connection methods between the sensors and the charge amplifier 3, dynamic data acquisition system 4, and data processing system 5, as well as the selection and working principles of the charge amplifier 3, dynamic data acquisition system 4, and data processing system 5, are well-known to those skilled in the art and will not be elaborated upon in this embodiment.

[0100] In step S2, the fuse 11 is ignited by the triggering device 6, 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 particles in the heavy metal particle intercalation 12 are accelerated to their maximum speed and fly towards the piston slider 2-2 under the detonation drive of the core 13. When the metal particle group and the shock wave are loaded together on the piston slider 2-2, the counting sticker 2-1 can record the number of metal particles, and at the same time, the velocity acquisition system can monitor the speed of the metal particles when they hit the piston slider 2-2. The piston slider 2-2 moves 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... Figure 11 As shown.

[0103] In step S3, under the same charge and work conditions, after the shock wave is applied to the front end face of the piston slider 2-2, the piston slider 2-2 as a whole accelerates backward. The acceleration sensor 2-7 responds and obtains the acceleration curve of the piston slider 2-2 as a whole under the shock wave alone, as shown below. Figure 12 As shown; when the composite charge 1 is performing work, the metal particle group is accelerated to its maximum speed and flies towards the piston slider 2-2 under the driving action of the shock wave. The shock wave and the high-speed metal particles are simultaneously loaded on the front end face of the piston slider 2-2, and the piston slider 2-2 as a whole accelerates backward. The acceleration sensor 2-7 responds to obtain the acceleration curve of the piston slider 2-2 as a whole under the coupled loading of the shock wave and metal particles, as shown. Figure 13 As shown.

[0104] In this embodiment, the pressure sensor only tests the shock wave pressure curve of the same charge, without directly contacting the high-speed impact of metal particles. This avoids damage to the pressure sensor caused by high-speed moving metal particles, which could lead to distorted test results or excessive wear of the pressure sensor, thus 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 casing and located at the tail end of the piston slider 2-2. It is not directly subjected to the impact of shock waves or metal particles, which can protect the acceleration sensor 2-7, prevent damage to the acceleration sensor 2-7, extend its service life, and save costs.

[0106] In step S4, the specific impulse value is obtained by integrating the shock wave pressure curve generated under the same charge: If the area of ​​the front face of piston slider 2-2, i.e., the end face of circular slider 2-21, is A, then the impulse value of the shock wave doing work alone, calculated from the pressure data measured by the pressure sensor, is: I 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. The maximum velocity V1, which is the result of the work done by the shock wave on the piston slider 2-2 and the acceleration sensor 2-7 as a whole, is calculated by integrating the acceleration curve measured by the acceleration sensor 2-7. This allows for the calculation of the impulse I measured by the work test device 2 under the sole loading of the shock wave. r =MV1; that is, the impulse value I calculated from the pressure data measured by the pressure sensor under the sole loading of the shock wave. r The impulse value I calculated from the acceleration response curve of the work test device 2 i If the error is less than 5%, the test values ​​of the work test device 2 are 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 leading edge velocity of the metal particles (the velocity before reaching the surface of the counting sticker 2-1) collected by the velocity acquisition system is v. Therefore, the total impulse of the metal particles is I. p =Nmv, then the sum of the impulses under coupled loading of the metal particle group and the shock wave is I = I i +I p .

[0109] In step S5, when the shock wave from 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. Furthermore, the impulse value I' = MV2 under the coupled loading of the shock wave and metal particles of composite charge 1.

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

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

[0112] Furthermore, in this embodiment, the testing system only uses pressure sensors and velocity acquisition systems to assist in verifying the validity of the test results of the work test device 2 during the verification phase. Subsequent tests only use the acceleration curves collected by the acceleration sensors 2-7 of the work test device 2 to calculate the impulse value I' = MV2 under the coupled loading of the shock wave and metal particles of the composite charge 1 as the test result of the composite charge 1.

[0113] In other words, the initial test of the work test device 2 uses a pressure sensor and a velocity acquisition system for auxiliary verification. In subsequent use, the work test device 2 can independently test the work impulse of the composite charge 1 (different ratios and types).

[0114] The work performance testing device, system, and method of this invention solve the difficulty in obtaining the damage impulse value of a target under the coupled loading of a heavy metal particle group driven by a metal particle composite charge explosion and a shock wave. It is highly practical and operable, with a simple and clear product structure and testing method, and a well-defined principle, making it highly applicable. This embodiment verifies the accuracy of the work performance testing device 2 under both independent shock wave work and coupled shock wave and metal particle work conditions through dual testing. Furthermore, considering the high cost and easy wear and tear of the pressure sensor and velocity acquisition system, these are only used to verify the accuracy of the work performance testing device 2. After verification, the work performance testing device 2 can independently test the work performance of the coupled shock wave and metal particle system. Its metal casing protects the internal acceleration sensor, extending its service life and reducing testing costs.

[0115] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A work testing device, characterized by, Comprising: Counting stickers (2-1), piston slider (2-2), metal shell and acceleration sensor (2-7); The counting stickers (2-1) are 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) to record the motion acceleration of the piston slider (2-2) after being impacted; The piston slider (2-2) is slidingly installed in the metal shell.

2. The work testing device of claim 1, wherein, The counting stickers (2-1) are attached to the front end of the piston slider (2-2).

3. The work testing device of claim 2, wherein, 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 fixedly installed on the front and rear sides of the fixed base (2-4) respectively.

4. The work testing device of claim 3, wherein, 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 with the fixed base (2-4); The piston slider (2-2) is slidingly installed inside the piston mounting cylinder (2-32) of the cylindrical shell (2-3).

5. The work testing device of claim 1, wherein, 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 installed in the sensor mounting hole (2-27).

6. The work testing device of claim 3, wherein, The middle part of the rear cavity shell (2-5) is provided with a pressure relief circular hole (2-51).

7. The work testing device of claim 1, wherein, Further comprising: 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 installed on the upper end of the fixed platform (2-8); The upper and lower ends of the center rod (2-10) are connected with the fixed platform (2-8) and the support rod (2-11) respectively, and the bottom of the support rod (2-11) is fixedly provided with the base (2-12).

8. A functional capability testing system, characterized by Comprising: The work test device (2) of any one of claims 1-5, a dynamic data acquisition system (4), a data processing system (5), a pressure sensor and a speed acquisition system; The work test device (2) is used to acquire the number of metal particles working on the piston slider (2-2) and the motion acceleration of the piston slider (2-2); The pressure sensor can be used to monitor the shock wave pressure value; The speed acquisition system is used to monitor the motion speed of the metal particles hitting 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 in the test.

9. The do-ability testing system of claim 8, wherein, Further comprising: 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 performing a functional ability test, characterized in that, The work capacity test system of claim 8 or 9; The work capacity test method comprises the following steps: Step S1: make the composite charge and the equivalent charge without adding metal particles; install the work test device (2), and connect the acceleration sensor (2-7) to the dynamic data acquisition system (4) and the data processing system (5); install the pressure sensor or the speed acquisition system, and connect it to the dynamic data acquisition system (4) and the data processing system (5); Step S2: ignite the equivalent charge and the composite charge with 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 the equivalent charge and the motion acceleration curve of the piston slider (2-2) under the action of the composite charge; the pressure sensor acquires the shock wave pressure data under the action of the equivalent charge; the speed acquisition system acquires the speed v of the metal particles when impacting the piston slider (2-2); Step S4: According to the acceleration curve of the piston slider (2-2) under the same charge collected in the step S3, the impulse value I of the same charge is calculated r ; at the same time, the impulse I of the same charge is calculated according to the pressure data obtained by the pressure sensor i ; the difference between I r and I i is compared, and the ratio of the difference to I i is less than or equal to 5%, and it is considered that the data measured by the work test device (2) is valid; Step S5: Under the action of the composite charge, the counting sticker (2-1) records the number of metal particles impacting the piston slider (2-2) as N, the speed acquisition system records the speed of the metal particles impacting the piston slider (2-2) as v, the mass of the metal particles is m, and the impulse of the metal particles to the piston slider (2-2) is I p =Nmv, then the sum of the impulses under the coupling action of the shock wave and the metal particles of the composite charge 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 coupling impulse of the shock wave and the metal particles of the composite charge (1) to the piston slider (2-2) can be calculated as I', and the difference between I and I' is △I=|I'-I|. When the ratio of the difference △I to I 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 independently used to test the work capacity of the composite charge (1).

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