109 results about "Overpressure" patented technology

The invention discloses a shock wave overpressure field global measurement method based on multi-view image fusion, belongs to the technical field of explosive shock wave measurement, and is suitable for weapon equipment power evaluation and blasting safety analysis. The method comprises the following steps of: synchronously acquiring a time sequence image of the whole explosion process through a distributed multi-view high-speed imaging system, preprocessing the image by adopting pixel-by-pixel comparison, square operation enhancement and normalization processing, and positioning a shock wave edge contour; the blasting center coordinate is positioned through binocular parallax, the shock wave initial radius is determined by combining spatial domain analysis, and the key feature points of the front and rear edges of the wavefront are detected by using a dynamic search window and a radial gradient field. Based on multi-view constraints, a three-dimensional point cloud is generated through direct linear triangulation, and a three-dimensional wave front form is reconstructed in combination with least square spherical fitting. And finally, constructing a wavefront radius-time evolution model, and deducing a quantitative relationship between the instantaneous propagation velocity and the peak overpressure in combination with a Ranki ne-Huton iot relationship, thereby realizing the global high-precision calculation of the overpressure field.

The invention discloses an experimental device and an experimental method for combustible gas explosion discharge of a communicating container, and belongs to the field of combustible gas explosion protection. The experimental device comprises a communicated discharge container, a gas distribution system, a high-voltage ignition system, a data acquisition system, a high-speed schlieren system and a synchronous control system. The experimental device and the experimental method can be used for experimental research on combustible gas explosion release of the communicating container; the influence rules of factors such as static action pressure (Pstat), discharge caliber (Dv), discharge coefficient (Kv), spherical explosion container volume ratio (V1 / V2), communication pipeline length (L), communication pipeline diameter (D), fuel gas equivalence ratio (phi), ignition position (IIn) and ignition energy (E) on flammable gas explosion discharge overpressure and discharge flame are analyzed; and the formation factors of internal and external discharge overpressure peak values (a peak value Pb formed by rupture of a discharge diaphragm, a peak value Pex formed by external secondary explosion, a peak value Ph formed by Helmholtz oscillation, a peak value Pac formed by sound wave coupling and a peak value Pred formed by a maximum flame area), a discharge gas cloud structure, a discharge flame form and an external pressure wave evolution rule are explored.

The invention discloses a gas leakage process dynamic parameter-based limited space combustion explosion consequence prediction method. The method comprises the following steps of: acquiring concentration and speed segmentation time sequence data in every delta t time period from gas leakage in each working condition; forming a three-dimensional primary ignition source array, and simplifying the ignition source array according to a blasting numerical simulation result; obtaining a maximum temperature field data set, a static pressure field data set and a dynamic pressure field data set on a typical section in the burning and explosion process; mapping the concentration and speed segmented time sequence data set to a maximum temperature field, static pressure field and dynamic pressure field data set to obtain a combustible gas leakage explosion result prediction data set, preliminarily establishing a combustion explosion result prediction model, and training; and collecting gas leakage concentration and speed time sequence data in the limited space, and inputting the data into the combustion explosion consequence prediction model to obtain a temperature, static pressure and dynamic pressure maximum value field in the combustion explosion process. According to the invention, automatic prediction of the maximum overpressure, the dynamic pressure and the temperature field in the explosion process after combustible gas leakage in a real-time or super-real-time limited space is realized, and the prediction result is accurate.

The invention relates to the field of hydrogen energy conveying safety, in particular to a method, device and equipment for estimating the explosion damage range of a hydrogen conveying pipeline. The method for estimating the explosion damage range of the hydrogen conveying pipeline comprises the following steps: acquiring physical parameters and environmental conditions of the hydrogen conveying pipeline; based on the physical parameters of the gas conveying pipeline, the isentropic expansion theory is adopted to calculate the explosion energy of the hydrogen conveying pipeline in unit length; calculating initial peak overpressure by adopting an exponential decay model on the basis of the explosion energy of the hydrogen conveying pipeline per unit length; based on environmental conditions, correcting the initial peak overpressure to obtain corrected peak overpressure; and determining a damage range based on the corrected peak overpressure. According to the method, the shock wave overpressure generated by explosion of the hydrogen conveying pipeline can be rapidly calculated, efficient, accurate and real-time damage range estimation is achieved in combination with environmental factor correction, and personnel injury and property loss caused by potential accidents are reduced.

The invention relates to the technical field of fuel gas security and protection, in particular to a method and equipment for predicting fuel gas explosion overpressure in an underground space, and the method comprises the steps: obtaining inspection well parameters of a to-be-predicted underground space; the inspection well parameters comprise the well lid diameter, the well depth, the pipeline diameter, the gas concentration in the inspection well and the radius distance from an explosion point; determining the inspection well type of the to-be-predicted underground space, and selecting a corresponding gas explosion overpressure prediction model according to the inspection well type of the to-be-predicted underground space; the gas explosion overpressure prediction model comprises an external gas explosion overpressure prediction model and an internal gas explosion overpressure prediction model; inputting the diameter of the well lid, the well depth, the diameter of the pipeline, the gas concentration in the inspection well and the radius distance from the explosion point into an external gas explosion overpressure prediction model to obtain an external explosion gas overpressure prediction value; and inputting the well lid diameter, the well depth, the pipeline diameter and the gas concentration in the inspection well into the internal gas explosion overpressure prediction model to obtain an internal explosion gas overpressure prediction value.

The invention relates to an explosion impact test technology, in particular to a solid / gas two-phase explosive wave driven aircraft ground test device and method, and the solid / gas two-phase explosive wave driven aircraft ground test device comprises an anti-static floor, a gas distribution system, a test system, a solid explosive fixed initiation device and a tunnel system, the tunnel system comprises a fixed support, a tunnel, a gas circulator, a first gas exchange pipeline and a second gas exchange pipeline, the gas distribution system comprises a high-pressure gas tank, a high-pressure methane gas cylinder and an air exchanger, and the test system comprises an electronic exploder, a pressure sensor and a flame sensor. Modulation of different overpressures and different durations can be carried out by controlling the solid charge amount, the gas concentration, the solid explosive charge amount, the solid explosive type and the like, the overpressure peak value and the duration of explosion shock waves are adjustable and controllable, and the requirement that external loads of an aircraft continuously change in different flight environments is met.

The invention discloses a machine learning-based explosive shock wave distribution mode accurate analysis method. The method comprises the following steps of obtaining a multi-scene explosive overpressure field database comprising a training data set and a verification data set; constructing a machine learning model, wherein the machine learning model comprises a data reading module, a feature identification module and an output module; training and optimizing a machine learning model by adopting the training data set and the verification data set to obtain an explosion overpressure field prediction model; and predicting a field explosion overpressure field by using the explosion overpressure field prediction model to realize accurate analysis of an explosion shock wave distribution mode. The method is high in accuracy, strong in generalization ability and high in efficiency.

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.

The invention discloses an active projectile burst perforation damage behavior prediction method, which comprises the following steps of: constructing a quasi-closed container temperature rise and energy conversion model based on a first law of thermodynamics, and analyzing energy release and global overpressure in an active material quasi-closed container based on the model, and an equivalent TNT equivalent relation reserved for a detonation product by PTFE / AL, so as to predict the burst perforation damage behavior of an active projectile. A method for predicting the shock wave overpressure peak value and the positive pressure area action time in the air is further established, a projectile-target collision behavior is converted into target plate deformation work through specific kinetic energy modeling of a penetration body projectile, a target plate deformation prediction model is established on the basis of impact wave overpressure and positive pressure area action time factors, and meanwhile, the impact wave overpressure peak value in the air and the positive pressure area action time are predicted on the basis of fracture mechanical behavior analysis. Under the condition of considering the crack ultimate strength factor, an aftereffect target ultimate deformation prediction model is established. Based on this, the scheme provides a brand new solution thought for the prediction method of the damage behavior of active projectile energy release-temperature rise-overpressure-bursting perforation of PTFE / AL.

The utility model discloses a multi-point floating accurate temperature measurement gauge, which comprises a mounting seat, a plurality of elastic connecting assemblies, a plurality of temperature detection assemblies and a limiting stopper, the mounting seat is detachably arranged on the pressure maintaining equipment; the plurality of elastic connecting assemblies are arranged on the mounting seat; each temperature detection assembly comprises a heat insulation piece and a temperature measurement probe. The plurality of heat insulation pieces are respectively arranged on the plurality of elastic connection assemblies, and the plurality of temperature measurement probes are respectively arranged on the plurality of heat insulation pieces; the limiting stop piece is arranged on the mounting base and used for limiting the descending distance of a lower pressing head on the pressure maintaining equipment. According to the multi-point floating accurate temperature measurement gauge provided by the utility model, the temperature of the lower pressure head can be detected more accurately, and meanwhile, overpressure is prevented, so that the temperature detection assembly is prevented from being damaged.

The invention discloses a square closed space combustible gas explosion overpressure prediction method and a processor, and relates to the technical field of combustible gas explosion overpressure prediction. The method comprises the following steps: firstly, assuming relevant parameters in the explosion process of the square closed space; establishing a simplified physical model according to flames development characteristics of combustible gas explosion in an experiment; then, according to the simplified physical model, combining with a control equation to obtain an explosion pressure prediction mathematical model; and finally, the engineering actual prediction initial parameters are substituted into the explosion pressure prediction mathematical model for calculation, and prediction values of the square confined space explosion overpressure in different explosion stages can be obtained. According to the invention, the explosion overpressure prediction model established by using the segmentation method has high conformity with an experimental result; according to the method, the explosion overpressure of the square closed space can be quickly predicted, and reliable reference basis is provided for combustible gas explosion disaster effect and consequence evaluation.

The application provides a kind of air shock wave and fragment composite injury rapid evaluation method and system, it is related to data processing technical field.The method comprises: obtaining explosion working condition parameters;According to the explosion working condition parameters, determine the peak value of air shock wave overpressure;According to the peak value of air shock wave overpressure, determine the damage probability value of air shock wave to personnel;According to the explosion working condition parameters, determine the initial velocity of fragment and the number of fragments;According to the initial velocity of fragment and the number of fragments, determine the damage probability value of fragment to personnel;Comprehensive air shock wave damage probability value of personnel and the damage probability value of fragment to personnel, evaluate air shock wave and fragment composite damage probability value.The application can quickly evaluate air shock wave and fragment composite damage probability value, the evaluation cost is low, the implementation difficulty is small, without complex biological modeling, evaluation time is short, can meet the timeliness demand of emergency treatment, can provide more rapid, convenient decision support for actual rescue.

The invention discloses a method for predicting the explosion intensity of a steam cloud based on a flame velocity. The method comprises the following steps: constructing a flame propagation prediction formula by integrating factors such as a gas cloud limitation degree, obstacle blockage, steam cloud activity and a flame propagation distance; collecting data in different scenes for fitting analysis, and determining values of undetermined parameters in the flame propagation prediction formula in different scenes; solving a flame propagation prediction formula to obtain a dimensionless flame velocity based on the value of the undetermined parameter in the target scene, and determining an actual flame velocity in combination with the sound velocity; based on the determined actual flame speed, predicting the explosion overpressure through a relational expression between the actual flame speed and the explosion overpressure established in the target scene; based on the predicted explosion overpressure, the explosion impulse is predicted through a relational expression between the explosion overpressure and the explosion impulse established in the target scene; and representing the explosion intensity of the steam cloud based on the predicted explosion overpressure and explosion impulse. The method is simple in process, high in reliability and wide in application range.

The invention discloses an experimental method for studying the influence of shock waves on engine operation, belonging to the field of aircraft test technology. The invention utilizes an inlet model, a real engine and shock wave simulation technology, and in view of the characteristics of shock wave overpressure, combines the use of dynamic sensors, simulates the overpressure pressure generated by the shock wave in the flow field outside the inlet flow path entrance, and the dynamic changes of the load and distortion of the flow field inside the inlet flow path and the engine, and realizes the measurement of parameters such as aerodynamic load and distortion of the model inlet flow path and the inner surface of the engine under the influence of the explosion shock wave, and whether the engine can work stably. By studying the changes in important parameters and the working state of the engine, the influence of shock waves on the stable operation of the engine is analyzed.

The invention discloses a double-explosion-source shock wave superposition overpressure prediction method, which comprises the following steps of: establishing an overpressure model suitable for a point on a middle vertical plane during interaction of double-explosion-source shock waves through dimensional analysis, introducing an energy proportion correction term and a geometric attenuation function, and carrying out parameter calibration through existing experimental data; a specific double-explosion-source shock wave superposition overpressure calculation formula is obtained; according to the method, the overpressure under double-explosion-source shock wave superposition can be simply and rapidly predicted, a universal dimensionless function is provided, and overpressure prediction of a double-source shock wave superposition surface under near-field and far-field areas is covered.

A solid engine quick cook-off test device is characterized in that a tested solid engine is placed above an oil tank through a fixing device, fuel in the oil tank is ignited by an ignition system to generate flame, and the flame is enabled to directly face the outer surface of the solid engine to heat; the environment temperature monitoring system is used for monitoring the environment temperature around the solid engine in the test process; the solid engine temperature monitoring system is used for monitoring the temperature of the surface and internal measuring points of the solid engine; the video monitoring system is used for recording the flame combustion condition in the rapid cook-off test process, the reaction condition of the solid engine, the working condition of each monitoring system measuring point and the working condition of the verification plate; the thermal infrared imager is used for recording radiation heat in the rapid cook-off test process; the ground and air shock wave overpressure monitoring system is used for monitoring shock wave overpressure generated when the solid engine reacts, and the verification plate is used for receiving impact of solid matter flying out when the solid engine reacts.

The utility model relates to the technical field of liquefied gas filling, in particular to an explosion-proof device, which comprises a filling pipeline, a cooling outer pipe and a small gas storage tank, a pressure detection valve is arranged at the tail of the filling pipeline, the cooling outer pipe is mounted on the outer side of the filling pipeline, a cooling cavity is formed between the cooling outer pipe and the filling pipeline, and the small gas storage tank is mounted in the cooling cavity. A pressure relief branch pipe is installed at the tail of the filling pipeline, the pressure relief branch pipe is communicated with the filling pipeline, an automatic pressure relief valve and a check valve are arranged on the pressure relief branch pipe, a first air inlet pipe is arranged on the small air storage tank, and a second air inlet pipe is installed at the side end of the first air inlet pipe. The gas filling system has the advantages that the gasification amount of liquefied gas is reduced, automatic pressure relief can be achieved under the emergency condition, pipeline overpressure burst and operator injury are prevented, potential safety hazards of the gas filling system are reduced, the safety and reliability of the gas filling system are improved, accidents are reduced, and the safety of the gas filling system is improved. And the life safety of personnel and the normal operation of equipment are ensured.

The invention relates to a device for operating non-explosion-proof equipment in a potentially explosive atmosphere, comprising a pressurized housing (1) designed to accommodate the non-explosion-proof equipment (2), a purge gas inlet (3) arranged upstream of the housing (1) through which a protective gas (4) can be supplied to the housing (1) under overpressure, and a purge gas outlet (7) arranged downstream of the housing (1) through which the protective gas (4) can be discharged from the housing (1). For the discharge of the protective gas (4), an outlet valve (8) with a valve seat (16) and a valve body (30) is arranged in the purge gas outlet (7). The valve body (30) is connected to the first end of a guide axis (31) which is slidably mounted in a through bore (21) in the valve seat (16) along the valve axis (15) so that the valve body (30) is axially adjustable between a closed position and an open position.By means of a spring element (34), the valve body (30) is biased against the valve seat (16) in the closed position. To achieve efficient and gentle operation with moderate equipment costs, the invention proposes that a baffle element (32) be attached to the opposite second end of the guide axis (31) and that a control housing (25) with a working chamber (28) be connected to the valve seat (16), wherein the baffle element (32) is arranged within the working chamber (28) and without contact with the control housing (25). Furthermore, the control housing (25) has a connection (27) to which a control line (9) is connected for supplying the working chamber (28) with a working fluid (29), via which the working chamber (28) and the baffle element (32) arranged therein can be pressurized with the working fluid (29) from the control line (9).

The utility model relates to the technical field of gas distribution, and provides a safe gas distribution device, which comprises a manifold, a gas inlet pipe arranged at the front end of the manifold, a gas inlet flange fixed at the end part of the gas inlet pipe, a plurality of groups of gas outlet pipes arranged at the rear end of the manifold, and a control assembly arranged at the end part of the gas outlet pipe and comprising a valve arranged at the end part of the gas outlet pipe, during use, air, nitrogen and other gas supplied from the outside are conveyed to gas using points through the manifold, explosion caused by overpressure of the manifold is effectively avoided in the use process, the pipe clamp is ingeniously and additionally arranged on the gas outlet pipe, one end of the pipe clamp is firmly connected with the gas outlet pipe, and the other end of the pipe clamp is tightly attached to an external hose. Even if the screw threads are loosened under the extreme condition, the hose can be effectively prevented from flying freely due to the fact that the hose loses constraint by means of the stable constraint effect of the pipe clamp, and then the personal safety of field operators is practically guaranteed.

The invention discloses a gunpowder combustion energy high-power pulse power supply simulation method, and relates to the field of gunpowder combustion energy MHD power generation simulation, and the method comprises the steps: carrying out the simulation experiment of a gunpowder combustion energy muzzle impact wave based on a gunpowder combustion energy generator, and determining an impact wave overpressure calculation correction formula; according to the shock wave overpressure calculation correction formula, in combination with a muzzle brake design method, a magnet brake power generation channel model of gunpowder combustion energy MHD is constructed; based on the magnetic body retreating device power generation channel model, analyzing the distribution condition of gunpowder forces of different charges on multiple flow fields in a power generation channel by utilizing a finite element analysis method; the multi-flow-field distribution condition comprises the efficiency of the brake and the speed of the flow field in the chamber. The gunpowder combustion energy high-power pulse power supply simulation method can simulate the gunpowder combustion energy high-power pulse power supply.

The application relates to a combustion and explosion risk prediction method and device based on a working condition self-adaptive fractal dimension, and particularly relates to the technical field of combustion and explosion safety. The method comprises the following steps: firstly, acquiring environment monitoring data and space structure data of a closed space; then, determining a flow field working condition in the closed space according to the environment monitoring data and the space structure data, the flow field working condition being used for determining a fractal dimension and a flame acceleration critical radius, the fractal dimension and the flame acceleration critical radius being self-adaptive to the turbulent intensity of the flow field working condition; using an overpressure prediction model to determine a combustion and explosion overpressure prediction result of a combustible mixture in the closed space according to the fractal dimension and the flame acceleration critical radius; and finally, determining a combustion and explosion risk grade corresponding to the closed space according to the combustion and explosion overpressure prediction result. The application can self-adaptively determine the flame propagation characteristics corresponding to the fluid working condition, predict the combustion and explosion overpressure, and further improve the combustion and explosion overpressure prediction accuracy.

The present application relates to a method for analyzing the surface load of a finite-size structure under the action of a far-field explosion wave, wherein the method comprises: determining shock wave parameters at a location of the finite-size structure based on explosion pressure parameters and environmental parameters, calculating the stagnation load on the surface of the structure and a first decay time history of the reflected overpressure based on the shock wave parameters; calculating the propagation speed of a diffraction wave on the surface of the structure based on the environmental parameters and the first decay time history, calculating the first moment when the diffraction wave reaches the target point and the second moment when the shock wave stagnates based on the speed and position parameters of the target point on the surface of the structure; calculating the second decay time history of the diffraction wave with respect to the reflected load based on the reflected overpressure on the surface of the structure at the first moment, the stagnation load at the second moment, the first moment, and the second moment; and determining the load time history of the target point based on the difference between the first decay time history and the second decay time history.

The uniqueness of the presented invention is a biofidelic, metamaterial structured, integrated with wireless sensors, modular, reusable, and anatomically accurate human surrogate (for both male and female) designed for testing and evaluation of personal protective equipment (PPE), and blast environments. Structured with metamaterials, the surrogate demonstrates a biofidelic response to blast overpressure. Metamaterials tailored for blast applications manipulate properties such as wave speed, acoustic impedance, and frequency response to match human tissues with minimized complexity. Incorporating technology from wearable blast sensors, the Blast Overpressure Body (BOB) provides high-resolution, high sampling rate, and time-synchronized simulated human blast data. Its modular design allows for easy replacement of damaged parts, alternative testing scenarios, and enhanced biofidelity, increasing flexibility and reusability. The BOB is a tool for testing, evaluating, and developing PPE and weapon systems, and for research, surveillance, and mitigation of blast exposure in military, industrial, civilian, and law enforcement contexts.

The application discloses a blast furnace overpressure comprehensive protection method, comprising the following steps: monitoring the air pressure in the blast furnace and whether the blast furnace top pressure detection is distorted, obtaining the air pressure result and the distortion condition; and performing comprehensive protection according to the air pressure result and the distortion condition, wherein when the air pressure is higher than a threshold value, overpressure automatic control diffusion valves and blast furnace overpressure automatic air reduction functions are started; when the blast furnace top pressure detection is distorted, the dust removal system overpressure diffusion system diffusion and the blast furnace turbine unit static blade opening degree automatic control switching to manual opening degree function are started, and the blast furnace clean gas is reduced in pressure; and if the overpressure is distorted, an audible and visual alarm is sounded. The blast furnace overpressure comprehensive protection system can effectively protect the normal production of the blast furnace, prevent serious production loss, personal injury and environmental protection accidents caused by the blast furnace overpressure.

According to the quasi-static load loading device with the condensed explosive as the explosion source, the condensed explosive is adopted as the explosion source, the structural design of the perforated plate is combined, the shock wave load generated by explosion of the condensed explosive is converted into the quasi-static load, the load characteristic of combustible gas explosion is effectively simulated, and the explosive explosion efficiency is improved. Solid explosives can be used for simulating a load action form of gas explosion, so that the difficulty of a gas explosion experiment is remarkably reduced; the device provides an experiment detection platform for the structural damage effect under the gas explosion load effect, obviously improves the explosion overpressure on the basis of ensuring quasi-static loading, and solves the problems that the explosion overpressure is too small and the structure cannot be damaged in the original gas explosion experiment. Meanwhile, the homogeneous fine sand layer can be used for absorbing shock wave loads transmitted from holes in the perforated plate, the quasi-static load loading effect of the lower portion of the perforated plate is guaranteed, the pressure sensor can be protected, and an efficient and reliable experiment means is provided for explosion disaster protection research.

The utility model discloses a kind of gas active safety defense devices, it is related to gas safety equipment technical field, including shell, one side in the shell is equipped with air inlet pipe, another side in the shell is equipped with air outlet pipe, one end of the air inlet pipe and the air outlet pipe respectively with gas pipeline air inlet pipe and gas pipeline air outlet pipe intercommunication after penetrating out the shell, another end of the air inlet pipe and the air outlet pipe is communicated with gas meter after penetrating out the shell;Valve is installed on the air inlet pipe, valve front pressure sensor and valve rear pressure sensor are respectively installed on the air inlet pipe located the two sides of valve before and after;Flow sensor is installed on the air outlet pipe.The utility model gas active safety defense device can detect the data of gas pipeline in real time, can determine that gas pipeline under pressure, overpressure, gas over flow, leakage, earthquake and other abnormalities in time, and actively cut off gas pipeline, greatly improve the security of gas use.

This invention relates to a method, apparatus, medium, and equipment for analyzing the overpressure characteristic values ​​of combustible gas explosions in marine oil and gas production facilities. The analysis method includes the following steps: geometrically modeling the marine oil and gas production facility; calculating the congestion degree of the process area of ​​the marine oil and gas production facility; calculating the volume of the combustible gas cloud under different filling ratios in the process area of ​​the marine oil and gas production facility; performing transient CFD simulations of combustible gas explosions with varying gas cloud positions and ignition positions to obtain the overpressure value of the protected target changing over time; determining the maximum overpressure value of the protected target under combustible gas explosion conditions; expanding the sample and performing statistical analysis and characteristic value calculations to obtain probability density curves and characteristic values; and determining the explosion-proof level of the protected target according to protection requirements.

The invention relates to a striking device for inert and active jet series penetration, belongs to the technical field of ammunition, and solves the problems that in the prior art, shock wave overpressure is formed by front-stage detonation, detonation products and fragments hinder a rear-stage follow-up energy body; and the follow-up energy body at the rear stage cannot smoothly invade through holes formed by explosion of the energy body at the front stage in a follow-up manner. The device comprises a front-stage unit, a rear-stage unit, a fixing sleeve, a flow guide body and a flow guide plate, the front-stage unit comprises a shaped charge liner and an initiating explosive, and the initiating explosive can be exploded, so that the shaped charge liner becomes metal jet flow, and a through hole is formed in a target; and the rear-stage unit is drilled into the target through the through hole to strike the target. Axial detonation waves and fragments generated by explosion of the initiating explosive can be dispersed in the radial direction of the conical surface of the flow guide body of the striking device, the detonation waves and the fragments can be discharged out of the fixing sleeve through the dredging holes, the influence of the detonation waves and the fragments on the rear-stage unit is reduced, and the rear-stage unit is prevented from changing the direction.

The present invention provides a numerical calculation and hazard assessment method for the leakage and combustion explosion of hydrogen-doped natural gas. The method includes: establishing a three-dimensional geometric model of the gate well space by using FLACS software; based on the hydrogen-doped natural gas leakage and diffusion model, calculating the change curve of the monitoring data of each monitoring point at different positions in the gate well space with time and the concentration distribution cloud map of hydrogen-doped natural gas by using FLACS software; performing numerical calculations of combustion and explosion based on the distribution cloud map to obtain the data of each monitoring point and the distribution cloud maps of jet flame, shock wave overpressure, and thermal radiation intensity; based on the numerical calculation results of combustion and explosion, calculating the probability of the thermal radiation and explosion shock wave generated by the explosion causing harm to the human body, so as to realize the assessment of combustion and explosion hazards. By adopting the probability function method to calculate the probability of different levels of damage to the human body when subjected to different shock wave overpressures and thermal radiations, the present invention can effectively evaluate the combustion and explosion hazards.

This invention discloses a physical enhancement and reconstruction method and system for explosion overpressure fields oriented towards sparse observations. It utilizes a pre-trained and optimized explosion overpressure sparse reconstruction model to physically enhance and reconstruct the on-site explosion overpressure field. The explosion overpressure sparse reconstruction model includes a sparse enhancement module, a feature identification module, a denoising module, and an output module. The sparse reconstruction method of this invention offers high reconstruction accuracy, strong generalization ability, and high efficiency, enabling high-precision reconstruction of the entire flow field of sparse overpressure data from explosion impacts in complex, multi-dimensional, and multi-scale scenarios.