Method for calculating overpressure peak value and positive pressure action time of shock wave under explosion driving of explosive

Abstract

The invention discloses a shock wave overpressure peak value and positive pressure action time calculation method under explosive explosion driving, and relates to the technical field of explosive wave simulation devices.The shock wave overpressure peak value correlation coefficient and positive pressure action time correlation coefficient of shock waves are calculated according to section parameters of an explosive wave simulation device, and then the charge density is calculated according to working conditions; the working conditions comprise a single-point explosion working condition, a multi-point simultaneous explosion working condition and a multi-point delayed explosion working condition, key parameters are calculated according to the correlation coefficient and the charge density, and the key parameters comprise the overpressure peak value and the positive pressure action time of shock waves. According to the method for calculating the shock wave overpressure peak value and the positive pressure action time under the explosive explosion driving, a basis is provided for accurate loading of an explosive wave simulation device by establishing a shock wave overpressure peak value and positive pressure action time prediction mechanism under the working conditions of single-point explosion, multi-point simultaneous explosion and multi-point delayed explosion.

Description

Technical Field

[0001] The invention relates to the technical field of explosion wave simulation devices, in particular to a method for calculating the overpressure peak value and positive pressure action time of a shock wave driven by explosive explosion. Background Art

[0002] The blast wave simulation device has the advantages of simple structure, convenient operation and high cost-effectiveness. The blast wave simulation device is generally composed of a driving section, a shaping section and a test section. Accurately predicting the two key parameters of the shock wave's overpressure peak and positive pressure action time can effectively shorten the test cycle, save test costs, and improve the use efficiency of the blast wave simulation device.

[0003] The common driving modes of explosion wave simulation devices are gunpowder driving, explosive explosion driving, compressed gas driving, or explosive explosion and high-pressure gas combined driving. The shock wave shape under the conditions of explosive explosion is closely related to factors such as the charge amount, charge form, charge position, and the cross-sectional form of the explosion wave simulation device. At present, the prediction methods of shock wave overpressure peak and positive pressure action time under the driving mode of explosive explosion are mostly for single-point explosion conditions. Under this condition, the calculation method mostly adopts the calculation method of the shock wave propagation law of the explosion in the tunnel; but it is very different from the explosion in the tunnel. The single-point explosion in the explosion wave simulation device is a semi-closed explosion and the cross-sectional form is variable. Therefore, it is difficult to accurately predict the shock wave peak and positive pressure action time in the explosion wave simulation device using the calculation method in the tunnel.

[0004] At the same time, in order to simulate various shock wave forms, multi-point explosion or multi-point delayed explosion driving mode is used for loading in the explosion wave simulation device. There is no mature method for predicting the shock wave overpressure peak and positive pressure action time under these two explosion modes.

[0005] In summary, the prior art does not have a mature and accurate technical solution for predicting the overpressure peak value and positive pressure action time of the shock wave in the blast wave simulation device under the condition of explosive explosion. Whether the overpressure peak value and positive pressure action time of the shock wave can be accurately predicted directly affects the accuracy of the test and the surface design of the blast wave simulation device. Therefore, how to more accurately predict the overpressure peak value and positive pressure action time of the shock wave has become a technical problem that needs to be solved in this field. Summary of the invention

[0006] The purpose of the present invention is to provide a method for calculating the overpressure peak value and positive pressure action time of the shock wave driven by explosive explosion, and to provide a basis for the accurate loading of the explosion wave simulation device by establishing a prediction mechanism for the overpressure peak value and positive pressure action time of the shock wave under single-point explosion, multi-point simultaneous explosion and multi-point delayed explosion conditions.

[0007] To achieve the above object, the present invention provides a method for calculating the overpressure peak value and positive pressure action time of a shock wave driven by explosive explosion, characterized in that the overpressure peak correlation coefficient of the shock wave and the positive pressure action time are calculated according to the cross-sectional parameters of the explosion wave simulation device; then the charge density is calculated according to different working conditions, and the working conditions include single-point explosion conditions, multi-point simultaneous explosion conditions, and multi-point delayed explosion conditions; and then the key parameters are calculated according to the correlation coefficient and the charge density, and the key parameters include the overpressure peak value and positive pressure action time of the shock wave;

[0008] Under the single-point explosion condition, the charge density is calculated according to the charge amount, and the overpressure peak value and positive pressure action time are calculated according to the overpressure peak value calculation formula and positive pressure action time calculation formula of the single-point explosion condition respectively;

[0009] Under the condition of multiple simultaneous explosions, the charge density is calculated according to the equivalent charge amount, and the overpressure peak value and positive pressure action time are calculated according to the overpressure peak value calculation formula and positive pressure action time calculation formula of the multiple simultaneous explosion conditions respectively;

[0010] Under the multi-point delayed explosion condition, the overpressure peak influence factor and the positive pressure action time influence factor are calculated according to the delayed time interval. The overpressure peak under the multi-point delayed explosion condition is obtained according to the overpressure peak influence factor and the overpressure peak under the multi-point simultaneous explosion condition. The positive pressure action time under the multi-point delayed explosion condition is obtained according to the positive pressure action time influence factor and the positive pressure action time under the multi-point simultaneous explosion condition.

[0011] Preferably, under the single-point explosion condition, the steps of calculating the overpressure peak value and the positive pressure action time of the ram wave are as follows:

[0012] S1. Measure the cross-sectional area S of the detonation point c , cross-sectional area S at the pressure measurement point j , the distance L from the detonation point to the pressure measurement point;

[0013] S2. Calculate the equivalent diameter d of the cross section at the pressure measurement point and the spatial volume V from the detonation point to the pressure measurement point. The calculation formula for the equivalent diameter is:

[0014] S3. Calculate the cross-sectional parameter S of the explosion wave simulation device based on the results of S1 and S2. j / S c , L / d;

[0015] S4. According to S j / S c , L / d value determines the overpressure peak correlation coefficient A p , B p , C p Correlation coefficient A with positive pressure action time τ , B τ , Cτ , D τ , where A p , B p are coefficients related to the cross-sectional parameter L / d; C p is the cross-sectional parameter S j / S c The relevant coefficient; A τ is the cross-sectional parameter S j / S c The relevant coefficient; B τ , C τ , D τ All are coefficients related to the cross-sectional parameter L / d;

[0016] S5. Calculate the charge density Q / V based on the charge quantity Q;

[0017] S6, according to the overpressure peak correlation coefficient A p , B p , C p and charge density Q / V, and use the overpressure peak calculation formula under single-point explosion conditions to obtain the shock wave overpressure peak Δp, which is calculated as follows:

[0018]

[0019] According to the positive pressure action time correlation coefficient A τ , B τ , C τ , D τ and charge density Q / V, and use the positive pressure action time calculation formula under single-point explosion conditions to obtain the positive pressure action time τ, which is calculated as follows:

[0020]

[0021] Preferably, under the condition of multiple simultaneous explosions, the steps of calculating the overpressure peak value and the positive pressure action time of the ram wave are as follows:

[0022] S1. Measure the cross-sectional area S of the detonation point c , cross-sectional area S at the pressure measurement point j , the distance L from the detonation point to the pressure measurement point;

[0023] S2. Calculate the equivalent diameter d of the cross section at the pressure measurement point and the spatial volume V from the detonation point to the pressure measurement point. The calculation formula for the equivalent diameter is:

[0024]

[0025] S3. Calculate the cross-sectional parameter S of the explosion wave simulation device based on the results of S1 and S2. j / S c , L / d;

[0026] S4. According to S j / S c , L / d value determines the overpressure peak correlation coefficient A p , B p , C p Correlation coefficient A with positive pressure action time τ , B τ , C τ , D τ , where A p , B p are coefficients related to the cross-sectional parameter L / d; C p is the cross-sectional parameter S j / S c The relevant coefficient; A τ is the cross-sectional parameter S j / S c The relevant coefficient; B τ , C τ , D τ All are coefficients related to the cross-sectional parameter L / d;

[0027] S5. Based on the equivalent charge coefficient K of multiple simultaneous explosions T Calculate the equivalent charge Q D , and the charge density Q is obtained D / V, multi-point simultaneous explosion equivalent charge coefficient K T Related to the number of charge points, equivalent charge quantity Q D The calculation formula is:

[0028] Q D =K Y Q

[0029] S6, according to the correlation coefficient of overpressure peak value and charge density Q D / V, the shock wave overpressure peak value Δp is obtained by using the shock wave overpressure peak calculation formula under multi-point simultaneous explosion conditions T , the calculation formula is as follows;

[0030]

[0031] According to the positive pressure action time correlation coefficient and charge density Q D / V, and the positive pressure action time τ is obtained by using the positive pressure action time calculation formula under multi-point simultaneous explosion conditions T , the calculation formula is as follows:

[0032]

[0033] Preferably, under the same number of explosion points and explosion wave simulation device parameters, the steps of calculating the ram wave overpressure peak value and positive pressure action time under the multi-point delayed explosion condition according to the ram wave overpressure peak value and positive pressure action time under the multi-point simultaneous explosion condition are as follows:

[0034] S7. Calculate the overpressure peak influence factor K related to the delay time according to the delay time interval Δt of the multi-point detonation. py And the positive pressure time influence factor K τy ;

[0035] S8. Peak value of shock wave overpressure Δp under multi-point delayed explosion condition y The calculation formula is:

[0036] Δp y =K py ×Δp T

[0037] Δp T It indicates the overpressure peak value under the condition of multiple explosions at the same number of explosion points;

[0038] Positive pressure action time τ y The calculation formula is:

[0039] τ y =K τy ×τ T

[0040] τ T It indicates the positive pressure action time under the condition of multiple simultaneous explosions with the same number of explosion points.

[0041] Preferably, in S7, the overpressure peak impact factor K py The calculation formula is:

[0042]

[0043] Positive pressure action time influence factor K τy The calculation formula is:

[0044]

[0045] Among them, A py , B py and C py are constants, and are all simultaneously related to the cross-sectional parameter S j / S c , coefficient related to cross-sectional parameter L / d; A τy , B τy and C τy are constants, and are all simultaneously related to the cross-sectional parameter S j / S c, coefficient related to cross-sectional parameter L / d.

[0046] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0047] The method for calculating key parameters in an explosion wave simulation device driven by explosive explosion provided by the present invention is based on single-point explosion, and according to the differences in load propagation characteristics, overpressure peak value, and positive pressure action time of multi-point simultaneous explosion, multi-point delayed explosion, and single-point explosion, introduces equivalent charging coefficient, action time, and overpressure peak influencing factors respectively, thereby realizing the prediction of main parameters of shock waves under different explosion conditions, effectively simplifying the calculation process, having strong engineering application value and academic value, and having strong guiding significance for the calculation of key parameters of shock waves of explosion simulation devices.

[0048] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 This is a flow chart of a method for calculating the shock wave overpressure peak value and positive pressure action time under a single-point explosion condition in Example 1 of the present invention;

[0051] Figure 2 This is a flow chart of a method for calculating the shock wave overpressure peak value and positive pressure action time under multi-point simultaneous explosion conditions in Example 2 of the present invention;

[0052] Figure 3 This is a flow chart of a method for calculating the shock wave overpressure peak value and positive pressure action time under multi-point delayed explosion conditions in Example 3 of the present invention. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] The purpose of the present invention is to formulate technical solutions for calculating the overpressure peak value and positive pressure action time of the shock wave under the conditions of single-point explosion, multiple-point simultaneous explosion and multiple-point delayed explosion, respectively, to accurately predict the two key parameters of the overpressure peak value and positive pressure action time of the shock wave, thereby effectively shortening the test cycle, saving test costs, and improving the use efficiency of the explosion wave simulation device.

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Example 1

[0057] like Figure 1 As shown, this embodiment takes 1.2 kg of TNT as an example, and the method for calculating the shock wave overpressure peak value and the positive pressure action time under a single-point explosion condition includes the following steps:

[0058] S1. Measure the cross-sectional area S of the detonation point c , cross-sectional area S at the pressure measurement point j , the distance L from the detonation point to the pressure measurement point; the detonation point cross-sectional area S of a certain explosion wave simulation device in this embodiment 1 c 7.07m 2 , cross-sectional area S at the pressure measurement point j 2.07m 2 The distance L from the detonation point to the pressure measurement point is 31.23m.

[0059] S2. Calculate the equivalent diameter d of the cross section at the pressure measurement point. The calculation formula for the equivalent diameter is: Take π = 3.14, and replace S in S1 j =2.07m 2 Substituting into the above formula, the equivalent diameter d of the cross section at the pressure measurement point is calculated to be 1.63m. The volume V of the space from the detonation point to the pressure measurement point is calculated to be 193.07m 3 .

[0060] S3. Calculate the cross-sectional parameter S of the explosion wave simulation device based on the results of S1 and S2. j / S c =0.293, L / d=19.16.

[0061] S4. According to S j / S c , L / d value determines the overpressure peak correlation coefficient A p , B p , C p Correlation coefficient A with positive pressure action time τ , B τ , C τ , Dτ The peak overpressure correlation coefficient A at this point in the explosion wave simulation device is obtained through experiments. p , B p , C p They are 4.90, 2607.49, and 0.05 respectively, and the positive pressure action time correlation coefficient A τ , B τ , C τ , D τ They are 22.46, 288.68, 1.35 and 87.80 respectively.

[0062] S5. Calculate the charge density Q / V based on the charge quantity Q. Taking the total charge of TNT as 1.2 kg as an example, the charge density is calculated to be 0.00622 kg / m 3 .

[0063] S6, according to the overpressure peak correlation coefficient A p , B p , C p and charge density Q / V, and use the overpressure peak calculation formula under single-point explosion conditions to obtain the shock wave overpressure peak Δp, which is calculated as follows:

[0064]

[0065] Substituting the relevant parameters from S1 to S5 into the above formula, we can obtain the overpressure peak value of 0.181 MPa.

[0066] According to the positive pressure action time correlation coefficient A τ , B τ , C τ , D τ and charge density Q / V, and use the positive pressure action time calculation formula under single-point explosion conditions to obtain the positive pressure action time τ, which is calculated as follows:

[0067]

[0068] Substituting the relevant parameters from S1 to S5 into the above formula, we can obtain that the positive pressure action time is 70.02ms.

[0069] Example 2

[0070] like Figure 2 As shown, this embodiment takes 1.2 kg of TNT as an example, and detonates in six sections simultaneously. The positions of the explosion wave simulation device and the pressure measuring points are the same as those in Example 1. The method for calculating the shock wave overpressure peak value and the positive pressure action time under the condition of multiple simultaneous explosions includes the following steps:

[0071] Take the same initial parameters as in Example 1, the cross-sectional area of ​​the detonation point S c 7.07m 2, cross-sectional area S at the pressure measurement point j 2.07m 2 , the distance L from the detonation point to the pressure measurement point is 31.23m, and the S1-S4 of the multi-point simultaneous explosion condition is the same as the S1-S4 of the single-point explosion condition, and the calculation results of the parameters are the same, the difference is:

[0072] S5. According to the number of explosives loaded, the equivalent charge coefficient K of multiple simultaneous explosions is obtained by looking up the table according to the number of charge points. T .

[0073] Equivalent charge factor K T It can be queried according to the following Table 1. If the number of charging points is between 2 and 6 and there is no numerical value, it can be calculated by linear interpolation method. If the number of charging points exceeds 6, further experiments or numerical calculations are required.

[0074] Table 1 Equivalent charge coefficient K of multi-point simultaneous detonation T Points correspondence table

[0075] More points 2 3 6 <![CDATA[Equivalent coefficient k T > 0.958 0.795 0.755

[0076] By looking up the table, we can know that the equivalent charging coefficient under the condition of simultaneous explosion at 6 points is 0.755.

[0077] According to the equivalent charge coefficient, the equivalent charge quantity Q is obtained D The calculation formula is:

[0078] Q D =K T Q

[0079] The equivalent charge factor K T =0.755 Substituting into the above formula, we can get the equivalent charge Q D It is 0.906Kg.

[0080] Charge density Q D / V is 0.00470kg / m 3 .

[0081] S6, according to the correlation coefficient of overpressure peak value and charge density Q D / V, the shock wave overpressure peak value Δp is obtained by using the shock wave overpressure peak calculation formula under multi-point simultaneous explosion conditions T , the calculation formula is as follows;

[0082]

[0083] The overpressure peak correlation coefficient A p =4.90, B p =2607.49, C p=0.05, charge density 0.00470kg / m 3 Substituting into the above formula, we can get the overpressure peak value Δp T It is 0.130MPa.

[0084] According to the positive pressure action time correlation coefficient and charge density Q D / V, and the positive pressure action time τ is obtained by using the positive pressure action time calculation formula under multi-point simultaneous explosion conditions T , the calculation formula is as follows:

[0085]

[0086] The positive pressure action time correlation coefficient A τ =22.46, B τ =288.68, C τ =1.35, D τ =87.80, charge density 0.00470kg / m 3 Substituting into the above formula, we can get the positive pressure action time τ T It is 90.73ms.

[0087] Example 3

[0088] The calculation method of shock wave overpressure peak and positive pressure action time under multi-point delayed explosion conditions is as follows: Figure 3 In Example 3, a total charge of 1.2 kg TNT is used as an example, and the explosion is divided into six stages. The delay time interval between adjacent explosion points is 30 ms. The explosion wave simulation device and the position of the pressure measurement point are the same as those in Examples 1 and 2. Taking the same initial parameters, the cross-sectional area S of the explosion point c 7.07m 2 , cross-sectional area S at the pressure measurement point j 2.07m 2 , the distance L from the detonation point to the pressure measurement point is 31.23m, and the S1-S6 of the multi-point delayed explosion condition and the S1-S6 of the multi-point simultaneous explosion condition obtain the same parameter calculation results, which will not be repeated here. The difference is that this embodiment also includes:

[0089] S7. Calculate the overpressure peak influence factor K related to the delay time according to the delay time interval Δt=30ms of the multi-point detonation. py And the positive pressure time influence factor K τy ,

[0090] Overpressure peak impact factor K py The calculation formula is:

[0091]

[0092] A py , Bpy and C py is the cross-sectional parameter S of the explosion wave simulation device j / S c , L / d. The constants at this point in the explosion wave simulation device in this embodiment are obtained through experiments, and are 4.633, 4.635, and 2.361, respectively. Substituting the constants into the above formula can obtain the overpressure peak influence factor K p It is 0.459.

[0093] Positive pressure action time influence factor K τy The calculation formula is:

[0094]

[0095] A τy , B τy and C τy is the cross-sectional parameter S of the explosion wave simulation device j / S c , L / d. The constants at this point in the explosion wave simulation device in this embodiment are obtained through experiments, and are 0.665, 0.095, and 6.438, respectively. Substituting the constants into the above formula can obtain the overpressure peak influence factor K τy It is 10.699.

[0096] S8. Using the overpressure peak impact factor K py And the positive pressure action time influence factor K τy , respectively, and the overpressure peak value Δp calculated by the calculation method of the shock wave overpressure peak value and positive pressure action time under the condition of simultaneous explosion at each point T and positive pressure action time τ T By multiplying them, we can get the peak value of the shock wave overpressure Δp under the multi-point delayed explosion condition. y and positive pressure action time τ y .

[0097] Specifically, under the condition of multi-point delayed explosion, the peak overpressure of the shock wave Δp y The calculation formula is:

[0098] Δp y =K py ×Δp T

[0099] Δp T It represents the peak overpressure under the condition of multiple explosions at the same explosion point number. T =0.130MPa, K py =0.459 Substituting into the above formula, we can get Δp y It is 0.06MPa.

[0100] Positive pressure action time τ y The calculation formula is:

[0101] τ y =K τy ×τ T

[0102] τ T It represents the positive pressure action time under the condition of multiple explosions at the same number of explosion points. T =90.73ms, K τy =10.699Substituting into the above formula, we can get τ y It is 970.72ms.

[0103] The remaining technical features in the above embodiments can be flexibly selected by those skilled in the art according to actual conditions to meet different specific practical needs. However, it is obvious to those skilled in the art that it is not necessary to adopt these specific details to implement the present invention. In other examples, in order to avoid confusing the present invention, the well-known components, structures or parts are not specifically described, which are all within the technical protection scope defined by the technical solution claimed for protection in the claims of the present invention.

[0104] Modifications and changes made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the scope of protection of the claims attached to the present invention. In the above description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details are not necessary to practice the present invention. In other examples, in order to avoid confusing the present invention, well-known technologies, such as specific construction details, operating conditions and other technical conditions, are not specifically described.

[0105] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for calculating the peak overpressure and positive pressure action time of a shock wave driven by explosive explosion, characterized in that: First, the correlation coefficient of the overpressure peak value of the shock wave and the correlation coefficient of the positive pressure action time are calculated according to the cross-sectional parameters of the explosion wave simulation device; then the charge density is calculated according to the working conditions, which include single-point explosion conditions, multi-point simultaneous explosion conditions and multi-point delayed explosion conditions; and then the key parameters are calculated according to the correlation coefficient and the charge density, which include the overpressure peak value of the shock wave and the positive pressure action time; Under the single-point explosion condition, the charge density is calculated according to the charge amount, and the overpressure peak value and positive pressure action time are calculated according to the overpressure peak value calculation formula and positive pressure action time calculation formula of the single-point explosion condition respectively; Under the condition of multiple simultaneous explosions, the charge density is calculated according to the equivalent charge amount, and the overpressure peak value and positive pressure action time are calculated according to the overpressure peak value calculation formula and positive pressure action time calculation formula of the multiple simultaneous explosion conditions respectively; Under the multi-point delayed explosion condition, the overpressure peak influence factor and the positive pressure action time influence factor are calculated according to the delayed time interval. The overpressure peak under the multi-point delayed explosion condition is obtained according to the overpressure peak influence factor and the overpressure peak under the multi-point simultaneous explosion condition. The positive pressure action time under the multi-point delayed explosion condition is obtained according to the positive pressure action time influence factor and the positive pressure action time under the multi-point simultaneous explosion condition.

2. The method for calculating the overpressure peak value and positive pressure action time of the shock wave driven by explosive explosion according to claim 1, characterized in that: Under the condition of single-point explosion, the steps for calculating the overpressure peak and positive pressure action time of the ram wave are as follows: S1. Measure the cross-sectional area S of the detonation point c , cross-sectional area S at the pressure measurement point j , the distance L from the detonation point to the pressure measurement point; S2. Calculate the equivalent diameter d of the cross section at the pressure measurement point and the spatial volume V from the detonation point to the pressure measurement point. The calculation formula for the equivalent diameter is: S3. Calculate the cross-sectional parameter S of the explosion wave simulation device based on the results of S1 and S2. j / S c , L / d; S4. According to S j / S c , L / d value determines the overpressure peak correlation coefficient A p , B p , C p Correlation coefficient A with positive pressure action time τ , B τ , C τ , D τ , where A p , B p are coefficients related to the cross-sectional parameter L / d; C p is the cross-sectional parameter S j / S c The relevant coefficient; A τ is the cross-sectional parameter S j / S c The relevant coefficient; B τ , C τ , D τ All are coefficients related to the cross-sectional parameter L / d; S5. Calculate the charge density Q / V based on the charge quantity Q; S6, according to the overpressure peak correlation coefficient A p , B p , C p and charge density Q / V, and use the overpressure peak calculation formula under single-point explosion conditions to obtain the shock wave overpressure peak Δp, which is calculated as follows: According to the positive pressure action time correlation coefficient A τ , B τ , C τ , D τ and charge density Q / V, and use the positive pressure action time calculation formula under single-point explosion conditions to obtain the positive pressure action time τ, which is calculated as follows:

3. The method for calculating the overpressure peak value and positive pressure action time of the shock wave driven by explosive explosion according to claim 1, characterized in that: Under the condition of multiple simultaneous explosions, the steps for calculating the overpressure peak and positive pressure action time of the ram wave are as follows: S1. Measure the cross-sectional area S of the detonation point c , cross-sectional area S at the pressure measurement point j , the distance L from the detonation point to the pressure measurement point; S2. Calculate the equivalent diameter d of the cross section at the pressure measurement point and the spatial volume V from the detonation point to the pressure measurement point. The calculation formula for the equivalent diameter is: S3. Calculate the cross-sectional parameter S of the explosion wave simulation device based on the results of S1 and S2. j / S c , L / d; S4. According to S j / S c , L / d value determines the overpressure peak correlation coefficient A p , B p , C p Correlation coefficient A with positive pressure action time τ , B τ , C τ , D τ , where A p , B p are coefficients related to the cross-sectional parameter L / d; C p is the cross-sectional parameter S j / S c The relevant coefficient; A τ is the cross-sectional parameter S j / S c The relevant coefficient; B τ , C τ , D τ All are coefficients related to the cross-sectional parameter L / d; S5. Based on the equivalent charge coefficient K of multiple simultaneous explosions T Calculate the equivalent charge Q D , and the charge density Q is obtained D / V, multi-point simultaneous explosion equivalent charge coefficient K T Related to the number of charge points, equivalent charge quantity Q D The calculation formula is: Q D =K T Q S6, according to the correlation coefficient of overpressure peak value and charge density Q D / V, the shock wave overpressure peak value Δp is obtained by using the shock wave overpressure peak calculation formula under multi-point simultaneous explosion conditions T , the calculation formula is as follows; According to the positive pressure action time correlation coefficient and charge density Q D / V, and the positive pressure action time τ is obtained by using the positive pressure action time calculation formula under multi-point simultaneous explosion conditions T , the calculation formula is as follows:

4. The method for calculating the overpressure peak value and positive pressure action time of the shock wave driven by explosive explosion according to claim 3, characterized in that: Under the same number of explosion points and explosion wave simulation device parameters, the steps for calculating the ram wave overpressure peak value and positive pressure action time under the multi-point delayed explosion condition based on the ram wave overpressure peak value and positive pressure action time under the multi-point simultaneous explosion condition are as follows: S7. Calculate the overpressure peak influence factor K related to the delay time according to the delay time interval Δt of the multi-point detonation. py And the positive pressure time influence factor K τy ; S8. Peak value of shock wave overpressure Δp under multi-point delayed explosion condition y The calculation formula is: Δp y =K py ×Δp T Δp T It indicates the overpressure peak value under the condition of multiple explosions at the same number of explosion points; Positive pressure action time τ y The calculation formula is: t y =K τy ×t T τ T It indicates the positive pressure action time under the condition of multiple simultaneous explosions with the same number of explosion points.

5. The method for calculating the peak overpressure and positive pressure action time of the shock wave driven by explosive explosion according to claim 4, characterized in that: In S7, the overpressure peak impact factor K py The calculation formula is: Positive pressure action time influence factor K τy The calculation formula is: Among them, A py , B py and C py are constants, and are all simultaneously related to the cross-sectional parameter S j / S c , coefficient related to cross-sectional parameter L / d; A τy , B τy and C τy are constants, and are all simultaneously related to the cross-sectional parameter S j / S c , coefficient related to cross-sectional parameter L / d.

Images