Coupling test method and system of wave load and explosion physical field under high gravity field

Abstract

The present application relates to the technical fields of explosion mechanics, fluid dynamics, multiphase flow, ocean engineering and experimental mechanics, in particular to a coupling test method and system of wave load and explosion physical field under supergravity field, the method comprises the following steps: in the coupling test process of wave load and explosion physical field under supergravity field, according to the time difference between wave motion and detonation, wave stabilization time and wave period, the phase of explosion is adjusted; wave parameter data and explosion load data in the coupling test are collected. The present application can be used to expand the research of other high-speed fluid dynamics problems, realize the experimental simulation and observation of the whole physical process of underwater explosion under the combined action of supergravity field and wave load, and can more truly simulate the underwater explosion scene under the sea wave environment.

Description

Technical Field

[0001] This invention relates to the fields of explosion mechanics, fluid dynamics, multiphase flow, marine engineering, and experimental mechanics, and specifically to a coupling experimental method and system for wave loads and explosion physical fields under hypergravity. Background Technology

[0002] Underwater explosions pose a significant threat to the safety of ports, dams, ships, and submarines. In actual underwater explosions, wave loads are unavoidable. Currently, numerical calculations, theoretical analysis, and model tests are commonly used to assess their destructive effects. Model tests are primarily conducted through ground-based experiments and vacuum decompression tests. While methods for simulating underwater explosions in hypergravity fields have been developed, wave simulation and methods coupling with underwater explosion loads are lacking. The following problems exist:

[0003] Still water environment (no waves, no additional acceleration): cannot reflect the effects of real sea conditions and moving platforms.

[0004] Underwater explosion research in wave environments: Initial attention has been paid to the effects of waves, but these studies are usually conducted under conventional gravity fields (1g), which cannot simulate high-speed motion or high-pressure environments equivalent to deep-sea pressure.

[0005] Centrifugal simulation is widely used in fields such as soil science, geology, and structure to simulate gravity effects, but its application in underwater explosion research involving transient explosions, high-speed fluid motion, and multiphase flow is extremely rare and presents significant technical challenges.

[0006] There is a lack of effective means and quantitative data for systematically studying the entire physical process of underwater explosions (shock waves, cavitation, and bubbles) under hypergravity conditions while simultaneously considering wave loads. Existing technologies are insufficient to reveal new laws governing explosion effects under the combined effects of high overload and waves.

[0007] The information in the background section is merely intended to illustrate the general background of the invention and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] To address at least some of the technical problems in the prior art, this invention provides a method and system for coupled testing of wave loads and explosion physics fields under hypergravity. Specifically, this invention includes the following:

[0009] A first aspect of the present invention provides a coupling test method for wave load and explosion physics field under hypergravity, the coupling test method for wave load and explosion physics field under hypergravity includes:

[0010] In the coupled test of wave load and explosion physics field under hypergravity, the phase of the explosion is adjusted according to the time difference between wave motion and detonation, wave stabilization time and wave period.

[0011] Wave parameter data and explosion load data were collected during the coupling test.

[0012] Optionally, the following may be included prior to the coupling test of wave load and explosion physics field:

[0013] Based on the scale of the preliminary test, determine the wave parameters and explosion parameters to be used in the coupled experiment.

[0014] Optionally, the wave parameters include the wave height amplitude h. m and the device's motion frequency f m The explosion parameters include the explosive equivalent W. m and explosion deep d m ;

[0015] Based on the scale of the preliminary test, the wave parameters and explosion parameters used in the coupled experiment are determined using the following formula:

[0016]

[0017] In the formula, n test For the scale of the preliminary test, h w For the simulated wave height, f w For the simulated wave frequency, W p For the simulated explosive equivalent, d p This is for simulating the explosion depth.

[0018] Optionally, the coupled experimental method for wave load and explosion physics field under hypergravity further includes:

[0019] The test scale range is determined based on the simulated wave frequency, the maximum frequency of the device, and the minimum frequency of the device.

[0020] Within the stated test scale range, determine the scale for the initial test.

[0021] Optionally, the coupled experimental method for wave load and explosion physics field under hypergravity further includes:

[0022] The explosive equivalent used in the coupling experiment exceeded the allowable range of the current test. The scale of the preliminary test was adjusted according to the explosive equivalent.

[0023] Optionally, the scale of the preliminary test can be adjusted according to the explosive equivalent using the following formula:

[0024]

[0025] Optionally, the phase of the explosion can be adjusted using the following formula, based on the time difference between wave motion and detonation, wave stabilization time, and wave period:

[0026]

[0027] In the formula, Δt is the time difference between wave motion and detonation, t0 is the wave stabilization time, and T is the time between wave motion and detonation. w For wave cycles, The phase in which the explosion occurs.

[0028] Optionally, the coupled experimental method for wave load and explosion physics field under hypergravity further includes:

[0029] During the coupling test of wave load and explosion physics field, the wave motion and initial state in the coupling test are corrected according to the deviation between the wave stability starting point and the actual value and the shooting frequency of the high-speed camera.

[0030] Optionally, the wave motion and initial state in the coupled test can be corrected using the following formula:

[0031]

[0032]

[0033] In the formula, ε t0 f represents the deviation between the wave stability starting point and the actual value. hc T is the shooting frequency of high-speed cameras. W It represents the wave cycle.

[0034] A second aspect of the present invention provides a coupling test system for wave load and explosion physics field under hypergravity, the coupling test system for wave load and explosion physics field under hypergravity includes a wave simulation device and a centrifuge for mounting the wave simulation device; the wave simulation device includes a memory and a processor; the memory stores a computer program, and the processor executes the computer program to implement the coupling test method for wave load and explosion physics field under hypergravity as described above.

[0035] This invention, through coupled experiments on wave loads and explosion physics under hypergravity, adjusts the phase of the explosion based on the time difference between wave motion and initiation, wave stabilization time, and wave period, thereby collecting wave parameter data and explosion load data during the coupled experiments. This can be used to extend the research to other high-speed fluid dynamics problems, realize experimental simulation and observation of the entire physical process of underwater explosions under the combined action of hypergravity and wave loads, and more realistically simulate underwater explosion scenarios in ocean wave environments. Furthermore, it can quantitatively study the coupling influence mechanism of hypergravity and waves on shock wave propagation, cavitation intensity and range, and bubble dynamics (pulsation period, jet direction and intensity, collapse energy, and migration path). It can be used to discover new phenomena and laws that cannot be observed in traditional 1g still water experiments, providing key basic experimental data for establishing or revising underwater explosion damage assessment models considering high overload and wave environments, accurate weapon effectiveness assessment, and deep-sea engineering safety protection. Attached Figure Description

[0036] Figure 1 A flowchart of a coupling test method for wave load and explosion physics field under hypergravity provided by an embodiment of the present invention;

[0037] Figure 2 A detailed flowchart of a coupling test method for wave load and explosion physics field under hypergravity provided by an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of the wave simulation device provided in this embodiment of the invention;

[0039] Figure 4 The installation diagram of the explosive source provided in this embodiment of the invention;

[0040] Figure 5 The supergravity field simulation topology diagram provided in this embodiment of the invention. Detailed Implementation

[0041] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0042] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that the upper and lower limits of the range and each intermediate value between them are specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, are also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0043] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0044] Example 1

[0045] This embodiment provides a coupled experimental method for wave loads and explosion physics fields under hypergravity, such as... Figure 1 As shown, the coupled experimental method for wave load and explosion physics field under hypergravity includes:

[0046] In the coupled test of wave load and explosion physics field under hypergravity, the phase of the explosion is adjusted according to the time difference between wave motion and detonation, wave stabilization time and wave period.

[0047] Wave parameter data and explosion load data were collected during the coupling test.

[0048] This invention, through coupled experiments on wave loads and explosion physics under hypergravity, adjusts the phase of the explosion based on the time difference between wave motion and initiation, wave stabilization time, and wave period, thereby collecting wave parameter data and explosion load data during the coupled experiments. This can be used to extend the research to other high-speed fluid dynamics problems, realize experimental simulation and observation of the entire physical process of underwater explosions under the combined action of hypergravity and wave loads, and more realistically simulate underwater explosion scenarios in ocean wave environments. Furthermore, it can quantitatively study the coupling influence mechanism of hypergravity and waves on shock wave propagation, cavitation intensity and range, and bubble dynamics (pulsation period, jet direction and intensity, collapse energy, and migration path). It can be used to discover new phenomena and laws that cannot be observed in traditional 1g still water experiments, providing key basic experimental data for establishing or revising underwater explosion damage assessment models considering high overload and wave environments, accurate weapon effectiveness assessment, and deep-sea engineering safety protection.

[0049] like Figure 2 As shown, in some embodiments, specific implementation methods for coupling experimental methods of wave loads and explosion physical fields under hypergravity fields are provided, including:

[0050] 1. Selection of wave simulation device

[0051] like Figure 3As shown, the wave simulation device, or simply the device, includes a model box, a wave-generating unit, a wave-dissipating unit, and a measurement unit; the wave-generating unit and the wave-dissipating unit are located on both sides of the model box.

[0052] The wave-generating unit includes a power mechanism, a motion mechanism, connecting components, and a guide rail; the power mechanism, rods, motion mechanism, and guide rail form a combined transmission structure; after liquid is injected into the model box, the power mechanism is used to drive the motion mechanism to reciprocate based on the combined transmission structure, so that the liquid around the motion mechanism moves along the length of the model box, thereby forming a wave load;

[0053] The wave-damping unit is used to dampen the wave load; the measuring unit is used to measure the preset physical parameters of the wave load.

[0054] like Figure 4 As shown, the wave simulation device has a sensor bracket, an explosion water pressure sensor, and an explosion source mounted on its support.

[0055] like Figure 5 As shown, a wave simulation device is installed on a centrifuge to simulate a hypergravity field.

[0056] Based on dimensional analysis, the scaling factors of each physical quantity in the simulation of hypergravity wave field are determined as shown in Table 1.

[0057] Table 1. Scale Factors of Hypergravity Field

[0058]

[0059]

[0060] 2. Determine the maximum frequency and stroke of the device, and calibrate the wave height and frequency as a function of the device's motion frequency, stroke, and gravitational acceleration.

[0061] 3. Initial determination of the scale ratio for the experiment

[0062] (1) Determine the test scale range based on the simulated wave frequency, the maximum frequency of the device, and the minimum frequency of the device. Specifically, based on the studied wave frequency and wave height, the frequency range of the device, and similarity criteria, preliminarily determine the test scale range.

[0063]

[0064] Among them, f w For the simulated wave frequency, f max f is the maximum frequency of the device. min This is the minimum frequency of the device.

[0065] (2) Determine the wave parameters used in the coupled experiment based on the scale of the preliminary test. Specifically, determine the scale n of the preliminary test based on the test scale range. test This determines the amplitude h of the wave height. m and the device's motion frequency f m ,

[0066]

[0067] Among them, h w For the simulated wave height, f w The simulated wave frequency is used. Based on the wave transfer function, the motion frequency and displacement amplitude of the hydraulic device can be determined. If the displacement amplitude exceeds the range, the motion mechanism needs to be replaced and the transfer function recalibrated.

[0068] (3) Determine the model equivalent, detonation depth, etc.

[0069] Based on the scale of the preliminary test, determine the explosion parameters used in the coupled experiment. Specifically, based on the scale of the model, determine the experimental explosive equivalent W. m , Explosion Deep d m Parameters,

[0070]

[0071] In the formula, n test For the scale of the initial selection experiment, the explosive equivalent W used in the coupling experiment. m The detonation depth d used in the coupling experiment m W p For the simulated explosive equivalent, d p This is for simulating the explosion depth.

[0072] (4) If the explosive equivalent used in the coupling experiment exceeds the allowable range of the current test, the scale of the initial test should be adjusted according to the explosive equivalent. For example, if the explosive equivalent is too small and exceeds the allowable range of the current test, the test scale should be controlled by the explosive equivalent.

[0073]

[0074] (5) Re-determine the wave height and frequency according to step (2). If the frequency is not suitable, the hydraulic device (power mechanism) of the wave simulation device needs to be replaced.

[0075] 4. System Synchronization Control

[0076] Wave action, detonation, and data acquisition should be synchronized through software or hardware. Hardware synchronization control offers high precision, but the principles of different systems differ, making it more difficult.

[0077] Software synchronization is relatively simple; it obtains various interfaces and precisely controls the timing of each operation while starting the device.

[0078] Since the impact of an explosion occurring at a wave crest or trough differs, it is necessary to precisely control the time difference Δt between wave motion and detonation. Based on the wave height motion curve, the detonation delay time can be designed to study the effects of different frequencies, wave heights, and phases on the explosion shock wave and bubble pulsation.

[0079] The phase of the explosion is adjusted based on the time difference between wave motion and initiation, the wave stabilization time, and the wave period. Specifically, the time is set, such as the wave stabilization time t0 and the wave period T. w To place the explosion at different phases, such as crests, troughs, or the middle of the explosion, different phases... It can be adjusted using the following formula:

[0080]

[0081] (1) Initial state determination and correction

[0082] Once gravitational acceleration stabilizes, wave generation begins. To prevent simulation errors, the timing and wave generation patterns are considered. Based on the deviation between the wave's stable inception point and the actual wave state, as well as the shooting frequency of the high-speed camera, corrections are made to the wave motion and initial state in the coupled experiment. A combination of high-speed imaging and a wave height meter can be used to correct the wave motion and initial state. If the deviation ε between the wave's stable inception point and the actual wave state is significant... t0 Exceed

[0083]

[0084] This may affect the interaction between waves and bubbles, so the timing needs to be adjusted.

[0085]

[0086] To avoid phase deviation at the moment of detonation, the high-speed camera's shooting frequency f hc It should not be lower than

[0087]

[0088] (2) Data Acquisition

[0089] Data acquisition and analysis consisted of two parts: wave parameter data acquisition and instantaneous blast load data acquisition.

[0090] Wave acquisition includes: wave height meter, high-speed camera (500-1000fps), and water pressure sensor, which can be started synchronously with the wave generator to acquire the complete process.

[0091] The explosion load includes: explosion pressure sensor and ultra-high speed camera (>10000fps). Due to the short acquisition time, this type of signal is acquired before the explosion. The delay time for acquiring the transient data of the explosion is 10-20ms before the explosion load.

[0092] This invention enables experimental simulation and observation of the entire physical process of underwater explosions under the combined effects of hypergravity and wave loads. It provides a more realistic simulation of underwater explosion scenarios in a wave environment. It allows for quantitative study of the coupling effects of hypergravity and waves on shock wave propagation, cavitation intensity and range, and bubble dynamics (pulsation period, jet direction and intensity, collapse energy, and migration path), revealing new phenomena and laws that are unobservable in traditional 1g still water experiments. It provides crucial fundamental experimental data for establishing or refining underwater explosion damage assessment models considering high overload and wave environments, accurate weapon effectiveness assessment, and deep-sea engineering safety protection. It also provides a highly complex yet powerful multiphysics coupling experimental research platform that can be used to extend research into other high-speed fluid dynamics problems.

[0093] Example 2

[0094] This embodiment provides a coupling test system for wave load and explosion physics field under hypergravity. The coupling test system for wave load and explosion physics field under hypergravity includes a wave simulation device and a centrifuge for mounting the wave simulation device. The wave simulation device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the coupling test method for wave load and explosion physics field under hypergravity as described in any one of the embodiments.

[0095] In the specific implementation process of this invention, please refer to Embodiment 1, which has the corresponding technical effects.

[0096] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. Various adjustments or changes may be made to the exemplary embodiments described in this specification without departing from the scope or spirit of the invention. The scope of the claims should be interpreted in the broadest possible sense to cover all modifications and equivalent structures and functions.

Claims

1. A method for coupling wave load and explosion physical field under high gravity field, characterized in that, The experimental method for coupling wave loads and explosion physics fields under hypergravity includes: Based on the scale of the preliminary test, the wave parameters and explosion parameters used in the coupled experiment are determined using the following formula; the wave parameters include wave height amplitude. h m and device movement frequency f m The explosion parameters include the explosive equivalent. W m and explosion depth d m ; In the formula, n test The scale used for the preliminary selection test. h w For the simulated wave height, f w For the simulated wave frequency, W p For simulated explosive equivalent, d p For the simulated explosion depth; In the coupled test of wave load and explosion physics field under hypergravity, the phase of the explosion is adjusted by the following formula based on the time difference between wave motion and detonation, wave stabilization time and wave period. In the formula, The time difference between wave motion and detonation. For the wave stabilization time, For wave cycles, The phase in which the explosion occurs; Wave parameter data and explosion load data were collected during the coupling test.

2. The method according to claim 1, wherein, The coupled experimental method for wave load and explosion physics field under hypergravity also includes: The test scale range is determined based on the simulated wave frequency, the maximum frequency of the device, and the minimum frequency of the device. Within the stated test scale range, determine the scale for the initial test.

3. The method according to claim 2, wherein, The coupled experimental method for wave load and explosion physics field under hypergravity also includes: The explosive equivalent used in the coupling experiment exceeded the allowable range of the current test. The scale of the preliminary test was adjusted according to the explosive equivalent.

4. The coupling test method for wave load and explosion physics field under hypergravity field according to claim 3, characterized in that, The scale of the initial selection test is adjusted according to the explosive equivalent using the following formula: 。 5. The method according to claim 1, wherein Based on the time difference between wave motion and detonation, the wave stabilization time, and the wave period, the phase of the explosion is adjusted using the following formula: In the formula, The time difference between wave motion and detonation. For the wave stabilization time, For wave cycles, The phase in which the explosion occurs.

6. The coupling test method for wave load and explosion physics field under hypergravity field according to any one of claims 1-5, characterized in that, The coupled experimental method for wave load and explosion physics field under hypergravity also includes: During the coupling test of wave load and explosion physics field, the wave motion and initial state in the coupling test are corrected according to the deviation between the wave stability starting point and the actual value and the shooting frequency of the high-speed camera.

7. The method according to claim 6, wherein the method is characterized by, The wave motion and initial state in the coupled experiment are corrected using the following formula: In the formula, The deviation between the wave stability starting point and the actual value. The shooting frequency of a high-speed camera. It represents the wave cycle.

8. A coupled experimental system for wave load and explosion physics field under hypergravity, characterized in that, The coupled experimental system for wave load and explosion physics field under hypergravity includes a wave simulation device and a centrifugal rotor for mounting the wave simulation device; the wave simulation device includes a memory and a processor; the memory stores a computer program, and the processor executes the computer program to implement the coupled experimental method for wave load and explosion physics field under hypergravity as described in any one of claims 1-7.

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