Multi-point explosion hazard effect evaluation test method and system

Abstract

The invention discloses a multi-point explosion hazard effect evaluation test method and a multi-point explosion hazard effect evaluation test system. The method comprises the following steps: uniformly distributing a plurality of explosion sources with prefabricated fragments on the same circumference and synchronously detonating; determining abdominal line distribution based on a shock wave superposition principle, and dividing a reference ring, an inner ring and an outer ring by taking an explosion central point O as a circle center according to a predicted overpressure peak value; and cake-shaped and penholder-type free field pressure sensors, impulse targets, simulation dummies, pine targets and speed measurement targets are systematically arranged on each ring layer along the abdominal line direction. By synchronously collecting multi-parameter data such as shock wave pressure-time history, fragment speed, target deformation, human body reflection overpressure and the like, quantitative analysis of shock wave superposition and attenuation characteristics, fragment power field distribution, human body damage risk and explosion impulse aftereffect is realized. The problem that the multipoint explosion hazard effect lacks a standardized test means is solved, and data support is provided for protection equipment research and development and safety standard formulation.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of multi-point explosion hazard effect evaluation test method, also relates to corresponding multi-point explosion hazard effect evaluation test system, belong to explosion safety testing technical field. BACKGROUND

[0002] Explosion safety testing technology is one of the key technologies in the field of public safety, military protection and emergency rescue. Traditional explosion hazard effect research is mostly focused on single-point explosion scene, and the shock wave propagation, fragment damage and other effects have established relatively mature test and evaluation methods. However, in actual terrorist attacks or industrial accidents, multi-point explosion (i.e. multiple explosion events occurring at the same place and close in time) is becoming more common. Compared with single-point explosion, multi-point explosion has the characteristics of strong randomness, multiple killing elements, superimposed hazard effects, and complex target damage mechanism. The shock waves generated by multiple explosion sources will interfere and superimpose in a specific area of space, significantly enhancing the peak overpressure; at the same time, the fragments flying in multiple directions will form a more intensive power field, resulting in a wider destruction range and greater comprehensive hazard effect, and the impact on society is more profound.

[0003] To cope with the threat of multi-point explosion, relevant research institutions have carried out a series of research work. These works have achieved results in data management, case investigation or single technology, but have obvious limitations: first, existing work focuses more on "after-the-event" investigation and data recording, rather than "before-the-event" or "during-the-event" hazard effect "quantitative testing" and "prediction evaluation"; second, these works are mostly aimed at single-point explosion or macro statistical analysis, lacking simultaneous and accurate testing methods for key parameters such as shock wave superposition mechanism, fragment comprehensive power field, and multi-site human body damage effect in the special scenario of "multi-point explosion".

[0004] Currently, there is a blank in the field of standardized testing and quantitative evaluation of multi-point explosion hazard effect. The lack of unified testing methods, layout specifications and evaluation standards makes it difficult to scientifically measure the performance of explosion-proof equipment, accurately develop emergency plans, and provide reliable data support for building blast-resistant design and public safety protection in the context of multi-point explosion. Therefore, it is urgent to establish a scientific, systematic and repeatable multi-point explosion hazard effect evaluation test method and system, which can simultaneously obtain multi-dimensional quantitative data such as shock wave superposition effect, fragment power field distribution and human body damage risk through one test, thereby filling the technical standard gap in this field and providing core technical support for the development of protective equipment, the formulation of safety standards and emergency decision-making. SUMMARY

[0005] The primary technical problem to be solved by the present application is to provide a multi-point explosion hazard effect evaluation test method.

[0006] The secondary technical problem to be solved by the present application is to provide a multi-point explosion hazard effect evaluation test system.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions,

[0008] According to a first aspect of an embodiment of the present application, a multi-point explosion hazard effect evaluation test method is provided, comprising the following steps:

[0009] S1: preparing explosion sources and test materials; wherein the explosion sources are a plurality of test explosion sources, each of which is wrapped with a plurality of prefabricated fragments on the outside of the explosive, and uses a synchronous initiation method when initiated; the test materials include at least one pine target, not less than three impulse targets, not less than two speed measurement targets, not less than three pen rod type free field pressure sensors, not less than three circular pie type free field pressure sensors, and not less than three dummy persons; each dummy person is installed with a wall pressure sensor on the head, chest and leg respectively;

[0010] S2: uniformly arranging each explosion source on the same circumference; the center of the circumference is the geometric center of the multi-point explosion, defined as the center point O; the heights of the explosion sources are the same;

[0011] S3: analyzing the abdominal line distribution of the shock wave overpressure peak value according to the number and charge amount of the explosion sources; the abdominal line is a line connected by points where the shock wave wave fronts of a plurality of explosion sources arrive at the same time, make the overpressure positively superimposed and reach the overpressure peak value;

[0012] S4: taking the center point O as the center, and delimiting the reference circle, the inner circle and the outer circle according to the predicted shock wave overpressure peak value;

[0013] S5: arranging the circular pie type free field pressure sensors on the reference circle, the inner circle and the outer circle, and all the circular pie type free field pressure sensors are directed to the center point O;

[0014] S6: arranging the dummy persons on the reference circle, the inner circle and the outer circle, and all the dummy persons are directed to the center point O, and the wall pressure sensors installed on the dummy persons are directed to the center point O;

[0015] S7: arranging the impulse targets on the reference circle, the inner circle and the outer circle, and all the impulse targets are directed to the center point O;

[0016] S8: arranging the pen rod type free field pressure sensors on the reference circle, the inner circle and the outer circle, and all the pen rod type free field pressure sensors are directed to the same selected explosion source;

[0017] S9: arranging the fan-shaped pine targets on the inner circle, and the pine targets are directed to a selected explosion source;

[0018] S10: arranging the speed measurement targets on the inner circle, and the speed measurement targets are directed to another selected explosion source;

[0019] S11: connecting each sensor with the test system to establish a synchronous initiation and a synchronous start relationship;

[0020] S12: connecting the speed measuring target with the timer;

[0021] S13: installing the explosion source and then evacuating the personnel;

[0022] S14: synchronously initiating a plurality of explosion sources and synchronously starting the test system;

[0023] S15: recording the test results of each sensor;

[0024] S16: analyzing the test data;

[0025] S17: generating a multi-point explosion hazard effect evaluation report.

[0026] Preferably, the determination method of the belly line in step S3 comprises:

[0027] If the charge amounts of the explosion sources are the same, the belly line is the part of the perpendicular bisector of the connecting line of the adjacent explosion sources which is located outside the explosion source polygon;

[0028] If the charge amounts of the explosion sources are different, the distribution of the shock wave overpressure peak points is determined by modeling calculation to obtain the belly line.

[0029] Preferably, when the bomb disposal suit is tested, the bomb disposal suit is worn on at least one simulated dummy, and at least one simulated dummy without wearing the bomb disposal suit is set as a control.

[0030] Preferably, when the circular pie free field pressure sensor, the simulated dummy and the impulse target are arranged in steps S5-S7, the following operations are performed:

[0031] A reference test device is arranged at the intersection of a selected belly line and a reference circle;

[0032] A baseline is taken as the connecting line of the reference test device and the center point O, and the baseline is rotated by +α degrees and -α degrees with the center point O as the rotation point, wherein 0<α≤30°;

[0033] Other test devices of the same type are arranged at the intersection of the rotated baseline and the inner circle and the outer circle;

[0034] Preferably, the reference device of the circular pie free field pressure sensor is HS2, the inner circle device is HS1, and the outer circle device is HS3;

[0035] Preferably, the reference device of the simulated dummy is JR2, the inner circle device is JR1, and the outer circle device is JR3;

[0036] The reference device is a CL2, the inner ring device is a CL1, and the outer ring device is a CL3;

[0037] The selected abdominal lines of the pie-type free-field pressure sensor, the analog dummy, and the impulse target are different from each other.

[0038] Preferably, the method of arranging the pen-type free-field pressure sensor in step S8 comprises the following steps:

[0039] A pen-type free-field pressure sensor S2 is arranged at the intersection of the line connecting the center point O and the selected explosion source E3 and the reference circle;

[0040] A baseline is drawn from the explosion source E3 and the sensor S2, and the baseline is rotated by +α degrees and -α degrees with the explosion source E3 as the rotation point, where 0 < α ≤ 30°;

[0041] The pen-type free-field pressure sensors S1 and S3 are arranged at the intersection of the rotated baseline and the inner circle and the outer circle, respectively;

[0042] All the pen-type free-field pressure sensors point to the explosion source E3 and do not block each other.

[0043] Preferably, the method of arranging the pine target in step S9 comprises the following steps:

[0044] The pine target is a fan-shaped homogeneous thickness target, and the target body height is not less than 2 meters;

[0045] The pine target is arranged with the bottom edge adhering to the inner circle, and the arc length is not less than a preset length;

[0046] The pine target points to the explosion source E1, and the arrangement position is located at the intersection of the line connecting the center point O and the explosion source E1 and the inner circle;

[0047] The half-circle fragments wrapped on the explosion sources E1 and E3 face the pine target.

[0048] Preferably, the method of arranging the velocity measurement target in step S10 comprises the following steps:

[0049] All the velocity measurement targets point to the explosion source E2, and the explosion source E2 is different from the explosion source E1 pointed to by the pine target;

[0050] The innermost layer of the test paper of the velocity measurement target is arranged on the inner circle;

[0051] If multiple velocity measurement targets are arranged, the velocity measurement targets do not block each other, and the innermost layers of the test papers are arranged close to the inner circle.

[0052] Preferably, the test results recorded in step S15 comprise:

[0053] The shock wave pressure-time history curves measured by the pen-type free-field pressure sensor and the pie-type free-field pressure sensor;

[0054] Reflected overpressure data measured by wall pressure sensors on the dummy;

[0055] Fragments passing time recorded by the velocity measurement target;

[0056] Maximum deformation of the impulse target;

[0057] Total number of fragment impacts on the pine target, and the number of penetrating fragments and embedded fragments are distinguished;

[0058] All data are recorded based on the unified time reference of the test system.

[0059] Preferably, the step S16 of analyzing the test data comprises:

[0060] Comparing the pressure-time history curves of the corresponding circle layer and azimuth of the circular pie free-field pressure sensor and the pencil free-field pressure sensor, to obtain quantitative comparison relationship of damage effects of multi-point explosion and single-point explosion;

[0061] Analyzing the pressure-time history curves of the circular pie free-field pressure sensor at different distances, to obtain the propagation and attenuation characteristics of the shock wave;

[0062] Analyzing the reflected overpressure-time history curves of the wall pressure sensors on the dummy, to evaluate the risk of damage to the key parts of the human body by the shock wave;

[0063] According to the velocity measurement target data, the fragment dispersion velocity is calculated, and the fragment power field range and kill radius are analyzed in combination with the pine target data;

[0064] According to the deformation of the impulse target, the shock wave impulse and the aftereffect of the comprehensive action on the structure are analyzed.

[0065] According to the second aspect of the embodiment of the present application, a multi-point explosion damage effect evaluation test system is provided, comprising:

[0066] A plurality of sensors, including a pencil free-field pressure sensor, a circular pie free-field pressure sensor, a wall pressure sensor installed on a dummy, and a velocity measurement target;

[0067] A signal conditioning device for amplifying, filtering and signal converting the sensor signals;

[0068] A data acquisition device for acquiring the conditioned signals;

[0069] A synchronous linkage control device for controlling all devices to start and stop synchronously, to ensure consistent data time stamps;

[0070] A data processing and analysis system comprises a processor and a memory, the memory stores a computer program, and the processor implements the multi-point explosion hazard effect evaluation test method described above when executing the computer program.

[0071] A display device for displaying test results and analysis reports.

[0072] Compared with the prior art, the present application can simultaneously obtain multi-dimensional hazard effect quantitative data under a multi-point explosion scene through one test, realizes integrated testing and quantitative analysis of the dynamic superposition and spatial attenuation law of the shock wave, the comprehensive power field distribution of the fragments, the reflected overpressure of the shock wave on the key parts of the human body, and the aftereffect of the explosion on the structure, provides method basis and system support for the standardized evaluation of the multi-point explosion hazard effect. BRIEF DESCRIPTION OF DRAWINGS

[0073] Figure 1 For the embodiment of the present application, a top view schematic diagram of three explosion source field layout of a multi-point explosion hazard effect evaluation test method.

[0074] Figure 2 For the embodiment of the present application, a structural schematic diagram of a multi-point explosion hazard effect evaluation test system.

[0075] Figure 3 For the embodiment of the present application, a schematic diagram of the abdominal line position of multi-point explosion. DETAILED DESCRIPTION

[0076] The technical content of the present application will be described in detail below in combination with the drawings and specific embodiments.

[0077] The technical concept of the embodiment of the present application is that by scientifically planning the hierarchical layout of the measuring points and adopting the way of synchronously initiating multiple explosion sources, the system collects the field test data obtained by multiple types of sensors, so as to realize quantitative analysis of key parameters such as the shock wave superposition effect, the fragment power field range and the human body damage risk, and provide basis for establishing the technical standard of explosion source hazard effect evaluation.

[0078] In the multi-point explosion hazard effect assessment test method provided in this embodiment of the invention, the test system includes two parts: an explosion source and test material equipment. The explosion source consists of multiple explosives with pre-fragmented explosive fragments wrapped around the outside; the test materials include various targets and sensors, specifically: at least one pine target, no fewer than three impulse targets, no fewer than two velocity targets (all for single use), no fewer than three pen-type free-field pressure sensors, no fewer than three disc-shaped free-field pressure sensors, and no fewer than three simulated dummies (each dummy has a wall pressure sensor installed on its head, chest, and legs, for a total of nine). This system can simultaneously record various hazard effect data generated when multiple explosion sources explode simultaneously, including single-point shock wave propagation characteristics, multi-point shock wave superposition effect, fragment dispersion velocity and dispersion range, and comparative data on the protective effect of bomb disposal suits, etc.

[0079] A single experiment can obtain multiple sets of shock wave parameters and other related damage data. It can not only analyze the incident and reflected wave parameters of a single-point explosion, but also reveal the action mechanism and comprehensive aftereffect of multiple superimposed shock waves, thus providing scientific and reliable data support for studying the propagation law and hazardous characteristics of shock waves under multi-point explosion conditions.

[0080] First Embodiment

[0081] See Figure 1 The diagram shown is a top view of the on-site layout of three explosion sources. The first embodiment of this invention provides a method for assessing the hazard effects of multi-point explosions, comprising at least the following steps:

[0082] S1: Prepare the explosion source and test materials.

[0083] The explosion sources include: test explosion sources (E1, E2, E3, etc.). This embodiment uses three explosion sources as an example for illustration. The specific number and charge amount are determined according to the actual requirements.

[0084] The test materials include: at least one pine target (T1), three or more impulse targets (CL1, CL2, CL3, etc.), two or more velocity targets (CS1, CS2, etc.), three or more pen-type free-field pressure sensors (S1, S2, S3, etc.), three or more disc-type free-field pressure sensors (HS1, HS2, HS3, etc.), and three or more simulated dummies (JR1, JR2, JR3, etc.). Each dummy has a wall pressure sensor installed on its head, chest, and legs. Optional items include one or more bomb disposal suits (D1, D2, etc.).

[0085] Each of the explosion sources (E1, E2, E3, etc.) consists of an explosive material with multiple pre-formed fragments wrapped around the outside of the explosive. The explosions are detonated simultaneously to assess the maximum destructive effect caused by explosions at multiple points.

[0086] Pine wood target (T1) is used to test the dispersion of the flying fragments produced by the explosion; it is a fan-shaped target body made of pine wood with a height of not less than 2 meters and an arc length of not less than a preset length. By recording the impact position, number and distribution of the fragments on the pine wood target T1, the damage range and power field of the fragments are quantified to evaluate the random flying characteristics of the fragments in multi-point explosions, such as analyzing the fragment coverage area and potential damage radius of a chain explosion, so as to identify high-risk areas. The preset length needs to cover the multi-angle path of the flying fragments.

[0087] Impulse target (CL1, CL2, CL3, etc.) includes a thin target plate, a target frame and a pressing plate, and the thin target plate and the target frame are fixed by the pressing plate through bolts to form a rigid test unit for testing the comprehensive effect of the explosion shock wave, especially the dynamic impact force (impulse) of the shock wave on the target and the deformation aftereffect, thereby supporting the anti-explosion design of the structure. The shock wave produced by the explosion acts on the surface of the impulse target plate, causing it to deform, and by measuring the deflection of the thin target plate, the aftereffect of the shock wave comprehensive action, including peak pressure, action time and impulse size, is analyzed. For example, the greater the deformation, the higher the shock wave energy, which can be used to derive the shock wave propagation law. Multiple impulse targets are distributed at different distances and directions around the explosion source to capture the spatial variation of the shock wave. Therefore, the impulse target can be used to quantify the comprehensive effect of the shock wave energy and time, helping to evaluate the superposition effect of the shock wave in multi-point explosions (such as the superposition of multiple explosion sources to enhance the destructive power of the wave). This is particularly critical in determining the anti-explosion performance of building structures or human protection equipment.

[0088] Velocity measurement target (CS1, CS2, etc.) uses an on-off target to test the flying speed of the explosion fragments, providing quantitative data of the kinetic energy of the fragments. This helps to determine the penetration ability, flight trajectory and flight distance of the fragments in evaluating the harmful effects of multi-point explosions, such as analyzing the impact risk of fragments on protective equipment or the human body, thereby achieving damage assessment. The velocity measurement target includes multiple sensor arrays that trigger on-off signals when the fragments fly through. The test principle is based on time interval measurement: the time difference of the fragments passing through two or more sensor points is used to calculate the initial speed of the fragments (initial speed = distance / time), and the average value is taken to derive the flight attenuation characteristics of the fragments, further determining the damage radius of the fragment dispersion.

[0089] Pen-and-rod free-field pressure sensors (S1, S2, S3) and circular pie free-field pressure sensors (HS1, HS2, HS3, etc.) are fixed on supports at certain heights, the heights being the same as the multiple explosion sources, to test the shock wave pressure parameters produced by multi-point explosions, and the circular pie free-field pressure sensors are used to test the multi-directional dynamic superposition shock wave overpressure parameters of multiple explosion sources.

[0090] The simulation dummy (JR1, JR2, JR3, etc.) points to the center of the explosion source, and wall pressure sensors are installed on the head, chest, and legs of the simulation dummy. The chest sensor is at the same height as the explosion source, and is used to test the reflected overpressure parameters of the multi-point explosion shock wave acting on each key part of the human body.

[0091] The bomb disposal suit (D1, D2, etc.) is worn on the simulation dummy, and the simulation dummy includes at least one bomb disposal suit and one without a bomb disposal suit, which is used to test the contrast of shock wave pressure attenuation before and after protection.

[0092] The pen barrel type and round cake type free field pressure sensors, the wall pressure sensors installed on the simulation dummy, and the speed target are connected with the test system. The pine target, the impulse target, the speed target, the pen barrel type and the round cake type free field pressure sensor, and the simulation dummy need to be fixed and installed with a support or a target frame, and the support or the target frame is fixed to the ground.

[0093] S2: According to the actual situation, the number and charge of the explosion source of the multi-point explosion are determined, the positions of the explosion sources (E1, E2, E3, etc.) are uniformly distributed on the same circle, the center of the circle is the geometric center point of the multi-point explosion, which is recorded as the center point O, the radius of the circle is recorded as r1, and the height of each explosion source is the same. The polygon formed by connecting each explosion source in turn is recorded as the explosion source polygon.

[0094] S3: According to the number and charge of the explosion source, the abdominal line distribution of the shock wave overpressure peak value is analyzed. The abdominal line is a line formed by connecting the points where the shock wave wave fronts of multiple explosion sources arrive at the same time, so that the overpressure is positively superimposed and reaches the overpressure peak value. Only the abdominal line outside the explosion source polygon is considered in the present application.

[0095] The abdominal line is a line formed by connecting the points where the shock wave wave fronts of multiple explosion sources arrive at the same time, so that the overpressure is positively superimposed and reaches the overpressure peak value. Since the explosion sources are uniformly distributed on the circle, the shock wave generated by each explosion source is a spherical wave that propagates outward from the explosion source. When these shock waves meet, interference occurs. In some positions, the shock waves from different explosion sources will strengthen each other, forming constructive interference. The overpressure amplitude at these positions is larger, and connecting the points where the overpressure is positively superimposed and reaches the overpressure peak value forms the abdominal line of the shock wave. Only the abdominal line outside the explosion source polygon is considered in the present application.

[0096] In this embodiment, each explosion source has the same charge amount; however, the charge amount can also be different. In the case of the same charge amount, the abdominal line is the midline of the connecting line between adjacent explosion sources. In the case of different charge amounts, the abdominal line position needs to be modeled and analyzed.

[0097] As Figure 3As shown, different number of explosion sources correspond to different abdominal line distribution. For three explosion sources, there are three abdominal lines, which are the vertical bisector of the connecting line between explosion sources E1, E2 and E3 respectively, and the part outside the explosion source polygon.

[0098] S4: Predict the peak value of shock wave overpressure and plan the layout of measuring point circle layer. Take the center point O as the center and the position where the predicted peak value of shock wave overpressure is 0.020 MPa as the radius to obtain the reference circle, take the position where the predicted peak value of shock wave overpressure is 0.022 MPa as the radius to obtain the inner circle, and take the position where the predicted peak value of shock wave overpressure is 0.018 MPa as the radius to obtain the outer circle, and then perform the layout of measuring point circle layer.

[0099] Among them, the reference circle is used as the safety range criterion for testing, the inner circle is used for testing the damage effect of multi-point explosion, and the outer circle is used for testing the attenuation effect of multi-point explosion.

[0100] S5: Arrange the circular pie free field pressure sensors (HS1, HS2, HS3, etc.) on different circle layers, and the number is not less than 3, and all the circular pie free field pressure sensors are directed to the center point O.

[0101] The specific arrangement scheme is: select an abdominal line that has not been used, for example Figure 1 The abdominal line between explosion sources E2 and E3 as shown, place HS2 at the intersection of this abdominal line and the reference circle; take the straight line passing through the center point O and HS2 as the baseline, and take the center point O as the rotation point, rotate the baseline by +α degrees and -α degrees (0<α≤30°) respectively, and the intersection of the rotated baseline and the inner circle and the outer circle is the position of HS1 and HS3; if there are more than three circular pie free field pressure sensors, the remaining circular pie free field pressure sensors are uniformly distributed according to the distance and angle from the center point O based on HS1, HS2 and HS3; when arranging, ensure that each circular pie free field pressure sensor is not blocked by each other, so that the test device does not interfere with each other; all the circular pie free field pressure sensors (HS1, HS2, HS3, etc.) are directed to the center point O.

[0102] S6: Arrange the simulated dummies (JR1, JR2, JR3, etc.) on different circle layers, and the number is not less than 3, install wall pressure sensors on the head, chest and legs of the simulated dummies, and the simulated dummies are directed to the center point O, and the wall pressure sensors installed thereon are directed to the center point O.

[0103] The specific arrangement scheme is: select an abdominal line that has not been used, for example Figure 1The intersection of the abdominal line between the explosion sources E1 and E3 and the reference circle is JR2; the intersection of the baseline and the inner and outer circles after the baseline is rotated by +a degrees and -a degrees (0

[0104] If there are EOD suit test subjects, the EOD suits (D1, D2, etc.) should be worn on the manikins, and at least one should be worn and one should not be worn for testing the impact of blast pressure attenuation before and after protection.

[0105] S7: Set up impulse targets (CL1, CL2, CL3, etc.) in different circle layers, with a quantity of not less than 3, and all impulse targets pointing to the center point O.

[0106] The specific layout scheme is: select an unused abdominal line, for example Figure 1 The intersection of the abdominal line between the explosion sources E1 and E2 and the reference circle is CL2. That is, HS2, JR2, and CL2 are located on the abdominal line between different explosion sources, ensuring that they do not interfere with each other.

[0107] The intersection of the baseline and the inner and outer circles after the baseline is rotated by +a degrees and -a degrees (0

[0108] S8: Set up pen barrel free field pressure sensors (S1, S2, S3, etc.) in different circle layers, and all pen barrel free field pressure sensors point to the same selected explosion source.

[0109] Select one explosion source, for example, E3; set a pen-type free-field pressure sensor S2 at the intersection of the ray formed by the center point O and the explosion source E3 and the reference circle; take the straight line connecting the explosion source E3 and S2 as the baseline, and take the selected explosion source E3 as the rotation point, and rotate the baseline by +a degrees and -a degrees (0 < a < 30°) respectively, and the intersection of the rotated baseline and the inner and outer circles is the position of S1 and S3; all pen-type free-field pressure sensors (S1, S2, S3) point to the same explosion source E3; when laying out, ensure that the pen-type free-field pressure sensors do not block each other and the test results do not interfere with each other.

[0110] S9: Lay out a fan-shaped pine target on the inner circle.

[0111] The pine target is a pine material uniform thickness target, the target body height is not less than 2 meters, the bottom edge is laid out in close contact with the inner circle, corresponding to a segment of arc on the inner circle, and the arc length is not less than the preset length; the fan-shaped pine target points to the explosion source E1; when laying out, a ray is drawn from the center point O and through the explosion source E1, and the ray is extended to intersect with the inner circle, and the intersection point is the position of the center of the pine target; the half-circle fragments wrapped on the explosion sources E1 and E3 face the pine target, so as to ensure that the pine target can capture the fragment dynamics near the explosion source.

[0112] S10: Lay out a speed measuring target at a position on the inner circle that is not blocked by other sensors.

[0113] The three layers of test target paper of the speed measuring target are uniformly distributed with break lines respectively to capture the speed and dispersion of fragments, and when laying out, the cable is connected to the timing system to ensure complete data acquisition.

[0114] The innermost layer of the speed measuring target test target paper is laid out on the inner circle; all speed measuring targets are laid out to point to one explosion source E2, but different from the explosion source E1 pointed to by the pine target. If there are multiple speed measuring targets, they do not block each other and the innermost layers of the test target papers of the speed measuring targets are arranged side by side near the inner circle.

[0115] S11: Connect each sensor to the test system through a cable. The pen-type free-field pressure sensors (S1-S3, etc.), the circular pie-type free-field pressure sensors (HS1-HS3, etc.), and the pressure sensors on the simulated manikins (JR1-JR3, etc.) are all electrically connected to the data acquisition system in the test system, and the test system and the multi-point explosion source establish a synchronous initiation and synchronous start relationship.

[0116] S12: Electrically connect the speed measuring target and the timer.

[0117] S13: After the installation of the above-mentioned test equipment is completed, personnel are evacuated, and professional personnel enter the site to install multiple explosion sources.

[0118] S14: According to the commander's order, the multiple explosives are ignited and detonated synchronously, and the test system is started synchronously.

[0119] S15: Record the test results. Record the shock wave pressure-time history curves measured by the pen-bar free field pressure sensors (S1-S3, etc.) and the circular pie free field pressure sensors (HS1-HS3, etc.) through the test system; record the data of the pressure sensors on the simulated manikins (JR1-JR3, etc.); record the time before and after the fragments pass through the velocity measurement target (CS1-CS2, etc.) measured by the velocity measurement target; record the maximum deformation of the impulse target (CL1-CL3, etc.). Record the total number of fragments falling on the pine target T1, including the number of penetration and the number of embedding in the pine target.

[0120] S16: Analyze the test data, respectively compare the measured shock wave pressures HS1 and S1, HS2 and S2, HS3 and S3, etc. pressure curves, obtain the comparison relationship of the damage effects caused by multi-point explosion and single-point explosion, and analyze the shock wave propagation characteristics of HS1, HS2, HS3, etc. at different distances of multi-point explosion; according to the recorded pressure-time history curves of the simulated manikins (JR1-JR3, etc.), analyze the possible damage to the human body caused by the reflection of the shock wave after the action; according to the time before and after the fragments pass through the velocity measurement target (CS1-CS2, etc.) measured by the velocity measurement target, analyze the fragment scattering velocity, calculate the fragment scattering distance, and combine with the analysis of the fragment hitting target number, obtain the range of the fragment scattering power field; according to the deformation data of the impulse target (CL1-CL3, etc.), obtain the comprehensive effect of the shock wave and the action time.

[0121] S17: Arrange the test report and obtain the multi-point explosion damage effect evaluation report.

[0122] It should be noted that the order of the above steps S5 to S10 is only for the sake of clear and simple description, which can be adjusted according to the actual situation, which can be performed in sequence or in parallel; the order can be opposite to the above order.

[0123] Compared with the prior art, the present application can obtain multi-dimensional hazard effect quantitative data under a multi-point explosion scene synchronously and accurately through one test, and the technical effect is remarkable: through a unique test layout method based on the shock wave abdominal line theory and the circle layer layout, the multi-point explosion specific shock wave dynamic superposition and spatial decay law, the comprehensive power field distribution of the flying debris, and the reflection overpressure of the shock wave on the key parts of the human body and the potential damage risk are effectively captured, and the comprehensive effect of the explosion on the structure is quantified by means of the impulse target. The present application not only fills the technical blank of the multi-point explosion hazard effect standardized quantitative test evaluation, but also provides solid and reliable high-precision data support for the research and development improvement of the explosion-proof and explosive disposal equipment, the anti-explosion design optimization of the building structure, and the scientific formulation of the public safety emergency plan by comparing the single-point and multi-point explosion data.

[0124] Second embodiment

[0125] As Figure 2 shown, on the basis of the above-mentioned multi-point explosion hazard effect evaluation test method, the second embodiment of the present application further provides a multi-point explosion hazard effect evaluation test system. The system comprises a plurality of sensors, a signal conditioning device, a data acquisition device, a synchronous linkage control device, a data processing and analysis system, and a display device. Each sensor is connected with the signal conditioning device. The signal conditioning device amplifies, filters, and converts the signals from the sensors, so that the data acquisition device can accurately and safely read the sensor signals. The synchronous linkage control device starts or stops all devices or sensors according to the preset conditions, so that all data acquisition channels start recording at the same time and sampling based on the same time stamp, ensuring that all data are strictly aligned on the time axis.

[0126] The data processing and analysis system comprises a processor and a memory, which are used to control the overall operation of the system to complete all or part of the steps of the above-mentioned multi-point explosion hazard effect evaluation test method. The processor can be a central processing unit (CPU), a graphics processing unit (GPU), a field programmable logic gate array (FPGA), an application specific integrated circuit (ASIC), a digital signal processing (DSP) chip, etc. The memory is used to store various types of data to support the operation of the system, which can include, for example, instructions for operating any application or method on the system, and application-related data. The memory can be realized by any type of volatile or non-volatile storage device or their combination, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, etc.

[0127] In another exemplary embodiment, the present application also provides a computer readable storage medium comprising program instructions, which, when executed by a processor, implement the steps of the multi-point explosion hazard effect evaluation test method in any one of the above embodiments. For example, the computer readable storage medium can be the above-mentioned memory comprising program instructions, which can be executed by the processor of the system to complete the above-mentioned multi-point explosion hazard effect evaluation test method and achieve the technical effects consistent with the above method.

[0128] It should be noted that the above embodiments are only illustrative. The technical solutions of various embodiments can be combined, and the order of various steps can be changed, all of which are within the protection scope of the present application.

[0129] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0130] The above provides a detailed description of the multi-point explosion hazard effect evaluation test method and system provided by the present application. For those skilled in the art, any obvious modification made to it without departing from the essential content of the present application will constitute an infringement of the patent right of the present application and will bear the corresponding legal responsibility.

Claims

1. A test method for assessing the hazard effects of multi-point explosions, characterized in that... Includes the following steps: S1: Prepare the explosive source and test materials; wherein, the explosive source is a plurality of test explosive sources, each explosive source having multiple pre-made fragments wrapped around the outside of the explosive, and the detonation is carried out in a synchronous manner; the test materials include at least one pine target, no less than three impulse targets, no less than two velocity targets, no less than three pen-type free field pressure sensors, no less than three disc-shaped free field pressure sensors, and no less than three simulated dummies; each simulated dummy is equipped with a wall pressure sensor on its head, chest and legs; S2: Distribute all explosion sources evenly on the same circumference; the center of this circumference is the geometric center of the multi-point explosion, defined as center point O; all explosion sources are at the same height. S3: Based on the number of explosion sources and the amount of explosive charge, the distribution of the overpressure peak of the shock wave is analyzed and obtained; the abdominal line is formed by connecting the points where the shock wave fronts of multiple explosion sources arrive at the same time, causing the overpressure to be positively superimposed and reaching the overpressure peak. S4: Using the center point O as the center, delineate the reference circle, inner circle, and outer circle based on the predicted peak value of the shock wave overpressure; S5: Install disc-shaped free-field pressure sensors on the reference ring, inner ring, and outer ring, with all disc-shaped free-field pressure sensors pointing towards the center point O; S6: Simulated dummies are placed on the reference circle, inner circle and outer circle, with all simulated dummies pointing to the center point O, and the wall pressure sensors installed on the simulated dummies pointing to the center point O; S7: Place impulse targets on the reference circle, inner circle and outer circle, with all impulse targets pointing towards the center point O; S8: Pen-type free-field pressure sensors are installed on the reference ring, inner ring, and outer ring, and all pen-type free-field pressure sensors point to the same selected explosion source; S9: Arrange fan-shaped pine targets on the inner circle, with the pine targets pointing at a selected explosion source; S10: Deploy velocity measuring targets on the inner ring, with the targets pointing at another selected explosion source; S11: Connect each sensor to the test system to establish a synchronous detonation and synchronous start-up relationship; S12: Connect the speed measuring target to the timer; S13: Evacuate personnel after installing the explosive source; S14: Simultaneous detonation of multiple explosive sources, with the test system starting synchronously; S15: Record the test results of each sensor; S16: Analyze the test data; S17: Generate a multi-point explosion hazard effect assessment report.

2. The multi-point explosion hazard effect assessment test method as described in claim 1, characterized in that... The method for determining the abdominal line in step S3 includes: If the explosive charges of each explosive source are the same, then the belly line is the part of the perpendicular bisector of the line connecting adjacent explosive sources located outside the polygon of the explosive source. If the explosive charges of each explosive source are different, the distribution of the overpressure peak point of the shock wave is determined by modeling and calculation to obtain the abdominal line.

3. The multi-point explosion hazard effect assessment test method as described in claim 1, characterized in that, When testing a bomb disposal suit, the suit is worn on at least one mannequin, and at least one mannequin not wearing a bomb disposal suit is used as a control.

4. The multi-point explosion hazard effect assessment test method as described in claim 1, characterized in that... When setting up the disc-shaped free-field pressure sensor, the simulated dummy, and the impulse target in steps S5 to S7, perform the following operations: A benchmark testing device is set up at the intersection of a selected web line and a reference circle; Using the line connecting the benchmark testing equipment and the center point O as the baseline, and using the center point O as the rotation point, rotate the baseline by +α degrees and -α degrees, where 0 < α ≤ 30°; Other test equipment of the same type are set up at the intersection of the rotated baseline with the inner and outer rings; Among them, the reference device of the disc-shaped free field pressure sensor is HS2, the inner ring device is HS1, and the outer ring device is HS3; The baseline device for the simulated dummy is JR2, the inner ring device is JR1, and the outer ring device is JR3; The reference device for the impulse target is CL2, the inner ring device is CL1, and the outer ring device is CL3; The disc-shaped free-field pressure sensor, the simulated dummy, and the impulse target all have different selected abdominal lines.

5. The multi-point explosion hazard effect assessment test method as described in claim 1, characterized in that... The method for deploying the pen-type free-field pressure sensor in step S8 includes: A pen-type free-field pressure sensor S2 is installed at the intersection of the line connecting the center point O and the selected explosion source E3 and the reference circle. Using the line connecting the explosion source E3 and the sensor S2 as the baseline, and taking the explosion source E3 as the rotation point, rotate the baseline by +α degrees and -α degrees, where 0 < α ≤ 30°; Pen-type free-field pressure sensors S1 and S3 are respectively installed at the intersections of the rotated baseline with the inner and outer rings; All pen-type free-field pressure sensors are pointing towards the explosion source E3 and do not obstruct each other.

6. The multi-point explosion hazard effect assessment test method as described in claim 1, characterized in that... The method for setting up the pine target in step S9 includes: The pine target is a fan-shaped, homogeneous, thick target with a height of not less than 2 meters. The bottom edge of the pine target is fitted to the inner circle, and the arc length is not less than the preset length. The pine target is pointed at the explosion source E1, and is positioned at the intersection of the line connecting the center point O and the explosion source E1 and the inner circle. The semi-circular fragments encased on the explosion sources E1 and E3 were pointing towards the pine target.

7. The multi-point explosion hazard effect assessment test method as described in claim 1, characterized in that... The method for setting up the velocity measuring target in step S10 includes: All velocity measuring targets point to the explosion source E2, and the explosion source E2 is different from the explosion source E1 that the pine target points to; The innermost layer of the speed measuring target test paper is arranged on the inner ring; If multiple speed measuring targets are set up, each speed measuring target will not block the others, and the innermost layer of the target paper will be arranged side by side close to the inner circle.

8. The multi-point explosion hazard effect assessment test method as described in claim 1, characterized in that... The test results recorded in step S15 include: Shock wave pressure-time history curves measured by pen-type free-field pressure sensor and disc-type free-field pressure sensor; Reflected overpressure data measured by pressure sensors on various walls of the simulated dummy; The time it takes for the fragments to pass through the sensor array, as recorded by the velocity measuring target; The maximum deformation of the impulse target; The total number of fragment impacts on the pine target, and the distinction between the number of penetrating fragments and the number of embedded fragments; All data is recorded synchronously based on a unified time benchmark of the test system.

9. The multi-point explosion hazard effect assessment test method as described in claim 1, characterized in that... Step S16 involves analyzing the test data, including: By comparing the pressure-time history curves of disc-shaped free-field pressure sensors and pen-shaped free-field pressure sensors at corresponding layers and orientations, a quantitative comparison of the hazard effects of multi-point explosions and single-point explosions was obtained. By analyzing the pressure-time history curves of a disc-shaped free-field pressure sensor at different distances, the propagation and attenuation characteristics of the shock wave are obtained. Analyze the reflected overpressure-time history curves of the pressure sensor on the upper wall of the simulated dummy to assess the risk of shock wave damage to key parts of the human body. Calculate the fragment dispersion velocity based on the velocity target data, and analyze the fragment force field range and kill radius by combining the pine target data; The impact of the shock wave and its combined effect on the structure are analyzed based on the deformation of the impact target.

10. A multi-point explosion hazard effect assessment and testing system, characterized in that... include: Multiple sensors, including a pen-shaped free-field pressure sensor, a disc-shaped free-field pressure sensor, a wall pressure sensor mounted on a mannequin, and a speed measuring target; Signal conditioning equipment is used to amplify, filter, and convert sensor signals; Data acquisition equipment is used to acquire conditioned signals; Synchronous linkage control equipment is used to control the synchronous start and stop of all equipment to ensure consistent data timestamps; A data processing and analysis system includes a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program to implement the multi-point explosion hazard effect assessment test method as described in any one of claims 1 to 9; Display devices are used to display test results and analysis reports.

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