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

Abstract

The invention relates to the technical field of explosion mechanics, fluid dynamics, multiphase flow, ocean engineering and experimental mechanics, in particular to a coupling test method and system for a wave load and an explosion physical field under a high gravity field. According to the time difference between wave movement and detonation, the wave stabilization time and the wave period, the phase where explosion is located is adjusted; wave parameter data and explosion load data in the coupling test are collected. The device can be used for expanding and researching other high-speed fluid dynamics problems, experimental simulation and observation of the full-physical process of underwater explosion under the combined action of a super-gravity field and a wave load are achieved, and an underwater explosion scene in a sea wave environment can be simulated more truly.

Description

Technical Field

[0001] The present invention relates to the technical fields of explosion mechanics, fluid dynamics, multiphase flow, ocean engineering and experimental mechanics, and in particular to a coupling test method and system for wave load and explosion physical field under a hypergravity field. Background Art

[0002] Underwater explosions are a destructive method that threatens the safety of ports, reservoirs, dams, ships, and submarines. In actual underwater explosions, they are inevitably affected by wave loads. Currently, numerical calculations, theoretical analysis, and model tests are commonly used to evaluate their damage effects. Model tests are currently mainly carried out through ground tests and vacuum decompression tests. Although methods for simulating underwater explosions in hypergravity fields have been developed, there is a lack of methods for wave simulation and coupling with underwater explosion loads. The following problems exist:

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

[0004] Research on underwater explosions in wave environments: Research has begun to focus on the effects of waves, but this is usually conducted under a conventional gravity field (1g), which cannot simulate high-speed motion or high-overload environments equivalent to deep-sea high pressure.

[0005] Hypergravity (centrifugal) simulation: It is widely used in geotechnical, geological, structural and other fields 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 poses huge technical challenges.

[0006] There is a lack of effective means and quantitative data to systematically study the full physical process of underwater explosions (shock waves, cavitation, and bubbles) in a hypergravity environment while also considering wave loading. Existing technologies struggle to reveal new patterns in the effects of explosions under the combined effects of high overload and waves.

[0007] The information in the background technology is only intended to illustrate the general background of the invention and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to a person skilled in the art. Summary of the Invention

[0008] To solve at least some of the technical problems in the prior art, the present invention provides a method and system for coupling wave load and explosion physical field under hypergravity field. Specifically, the present invention includes the following contents.

[0009] A first aspect of the present invention provides a coupling test method for wave loads and explosion physical fields under a hypergravity field, the coupling test method for wave loads and explosion physical fields under a hypergravity field comprising:

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

[0011] Collect wave parameter data and explosion load data in the coupling test.

[0012] Optionally, prior to testing the coupling of wave loading with blast physics, include:

[0013] Based on the scale of the preliminary test, the wave parameters and explosion parameters used in the coupling experiment are determined.

[0014] Optionally, the wave parameters include wave height amplitude h m and the device motion frequency f m ; The explosion parameters include explosive equivalent W m and Explosion Deep D m ;

[0015] According to the scale of the preliminary test, the wave parameters and explosion parameters used in the coupling experiment are determined using the following formula:

[0016]

[0017] Where n test is the scale of the preliminary test, h w is the simulated wave height, f w is the simulated wave frequency, W p is the simulated explosive equivalent, d p is the simulated blasting depth.

[0018] Optionally, the test method for coupling wave load and explosion physical field under hypergravity field further includes:

[0019] Determine the test scale range based on the simulated wave frequency, the maximum frequency of the device, and the minimum frequency of the device;

[0020] Determine the scale of the preliminary test within the test scale range.

[0021] Optionally, the test method for coupling wave load and explosion physical field under hypergravity field further includes:

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

[0023] Optionally, the scale of the preliminary test is 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 movement and detonation, wave stabilization time, and wave period:

[0026]

[0027] Where Δt is the time difference between wave movement and detonation, t0 is the wave stabilization time, T w is the wave period, The phase of the explosion.

[0028] Optionally, the test method for coupling wave load and explosion physical field under hypergravity field further includes:

[0029] During the coupling test of wave load and explosion physical field, the wave motion and initial state in the coupling test were 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 following formula is used to correct the wave motion and initial state in the coupled test:

[0031]

[0032]

[0033] Where, ε t0 is the deviation between the wave stability starting point and the actual value, f hc is the shooting frequency of high-speed camera, T W is the wave period.

[0034] The second aspect of the present invention provides a coupling test system for wave loads and explosion physical fields under a hypergravity field, wherein the coupling test system for wave loads and explosion physical fields under a hypergravity field comprises a wave simulation device and a centrifugal rotor for installing the wave simulation device; the wave simulation device comprises a memory and a processor; the memory stores a computer program, and the processor executes the computer program to implement any of the above-described coupling test methods for wave loads and explosion physical fields under a hypergravity field.

[0035] The present invention adjusts the phase of the explosion according to the time difference between wave motion and detonation, wave stabilization time and wave period during the coupling test of wave load and explosion physical field under hypergravity field, thereby collecting wave parameter data and explosion load data in the coupling test. The present invention can be used to expand the research on other high-speed fluid dynamics problems, realize the experimental simulation and observation of the full physical process of underwater explosion under the combined action of hypergravity field and wave load, and can more realistically simulate the underwater explosion scene in the wave environment. It can further 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, migration path), and can be used to discover new phenomena and new laws that cannot be observed in traditional 1g static water experiments, providing key basic experimental data for establishing or revising underwater explosion damage assessment models considering high overload and wave environment, accurate evaluation of weapon effectiveness, and deep-sea engineering safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0037] Figure 2 A detailed flow chart of a method for coupling wave loads and explosion physical fields under a hypergravity field provided by an embodiment of the present invention;

[0038] Figure 3 A schematic structural diagram of a wave simulation device provided by an embodiment of the present invention;

[0039] Figure 4 Schematic diagram of the installation of the explosion source provided by the embodiment of the present invention;

[0040] Figure 5 A topological diagram of a hypergravity field simulation provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting 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 terms described in the present invention are only for describing particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges in the present invention, it should be understood that the upper and lower limits of the ranges and each intermediate value therebetween are specifically disclosed. Each smaller range between any stated value or intermediate value within a stated range and any other stated value or intermediate value within the stated range is also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0043] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

[0044] Example 1

[0045] This embodiment provides a coupling test method of wave load and explosion physical field under hypergravity field, such as Figure 1 As shown, the coupling test method of wave load and explosion physical field under hypergravity field includes:

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

[0047] Collect wave parameter data and explosion load data in the coupling test.

[0048] The embodiment of the present invention adjusts the phase of the explosion according to the time difference between wave motion and detonation, wave stabilization time, and wave period during the coupling test of wave load and explosion physical field under a hypergravity field, thereby collecting wave parameter data and explosion load data in the coupling test. This can be used to expand the research of other high-speed fluid dynamics problems, realize experimental simulation and observation of the full physical process of underwater explosion under the combined action of hypergravity field and wave load, and more realistically simulate underwater explosion scenes in wave environments. It can further 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, migration path), and can be used to discover new phenomena and new laws that cannot be observed in traditional 1g static water experiments. It provides key basic experimental data for establishing or revising underwater explosion damage assessment models that consider high overload and wave environments, accurate weapon effectiveness assessment, and deep-sea engineering safety protection.

[0049] like Figure 2 As shown, in some embodiments, a specific implementation of a test method for coupling wave loads and explosion physical fields under a hypergravity field is provided, including:

[0050] 1. Selection of wave simulation device

[0051] like Figure 3As shown, the wave simulation device is referred to as the device, which includes a model box, a wave-making unit, a wave-breaking unit and a measuring unit; the wave-making unit and the wave-breaking unit are arranged 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, rod, motion mechanism, and guide rail form a combined transmission structure; after the model box is injected with liquid, the power mechanism is used to drive the motion mechanism to move back and forth based on the combined transmission structure, so that the liquid around the motion mechanism moves along the length direction of the model box, thereby generating a wave load;

[0053] The wave-absorbing unit is used to absorb the wave load; and the measuring unit is used to measure physical quantity parameters of preset wave loads.

[0054] like Figure 4 As shown, a sensor bracket, an explosion water pressure sensor, and an explosion source are installed on the bracket of the wave simulation device.

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

[0056] According to dimensional analysis, the scale factors of various physical quantities in the hypergravity field wave simulation are determined and shown in Table 1.

[0057] Table 1 Hypergravity field scaling factors

[0058]

[0059]

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

[0061] 3. Preliminary determination of test scale

[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 wave frequency and wave height studied, the frequency range of the device, and the similarity criterion, preliminarily determine the test scale range.

[0063]

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

[0065] (2) According to the scale of the preliminary test, determine the wave parameters used in the coupling experiment. Specifically, determine the scale n of the preliminary test according to the test scale range. test , thereby determining the amplitude of the wave height (wave height) h m and the device motion frequency f m ,

[0066]

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

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

[0069] According to the scale of the preliminary test, the explosion parameters used in the coupling experiment are determined. In detail, according to the scale of the model, the test explosive equivalent W is determined. m , blast depth d m and other parameters,

[0070]

[0071] Where n test is the scale of the preliminary test, and the explosive equivalent W used in the coupling experiment m , the blasting depth d used in the coupling experiment m , W p is the simulated explosive equivalent, d p is the simulated blasting depth.

[0072] (4) If the explosive equivalent used in the coupling experiment exceeds the allowable range of the current test, the scale of the preliminary 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 appropriate, the hydraulic device (power mechanism) of the wave simulation device needs to be replaced.

[0075] 4. System synchronization control

[0076] Waves, detonation, and data collection should be synchronized at the software or hardware level. Hardware synchronization has high control accuracy, but the principles of different systems are different and the difficulty is great.

[0077] Software synchronization is relatively simple, obtaining various interfaces and accurately controlling the timing of each operation while starting the device.

[0078] Since the impact of the explosion at the peak and trough of the wave is different, it is necessary to accurately control the time difference Δt between wave movement and detonation. According to the wave height movement curve, the detonation delay time is designed to study the effects of different frequencies, different wave heights, and different phases on the explosion shock wave and bubble pulsation.

[0079] Adjust the phase of the explosion according to the time difference between wave movement and detonation, wave stabilization time and wave period. For details, set the time, such as wave stabilization time t0, wave period T w In order to make the explosion in different phases of the explosion, such as the peak, trough or middle, the different phases It can be adjusted by the following formula:

[0080]

[0081] (1) Initial state determination and correction

[0082] Gravity acceleration is stable, wave generation begins. In order to prevent simulation errors, time, wave generation rules, according to the deviation between the wave stability starting point and the actual and the shooting frequency of high-speed camera, the wave motion and initial state in the coupling test are corrected. High-speed camera and wave height meter can be used to correct the wave motion and initial state. If the deviation between the wave stability starting point and the actual ε t0 Exceed

[0083]

[0084] It may affect the interaction between waves and bubbles, so the time should be adjusted accurately.

[0085]

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

[0087]

[0088] (2) Data Collection

[0089] Data collection and analysis is divided into two parts: one is wave parameter data collection, the other is explosion load instantaneous data collection.

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

[0091] The blast load includes: explosion pressure sensor, ultra-high-speed camera (>10000fps). Due to the short acquisition time, such signals are collected before the explosion. The delay time for explosion transient data collection starts 10-20ms before the blast load.

[0092] The embodiment of the present invention realizes the experimental simulation and observation of the full physical process of underwater explosion under the combined action of hypergravity field and wave load. It simulates the underwater explosion scene in the wave environment more realistically. It can quantitatively study the coupling influence mechanism of hypergravity and waves on shock wave propagation, cavitation intensity and range, bubble dynamics (pulsation period, jet direction and intensity, collapse energy, migration path), and discover new phenomena and new laws that cannot be observed in traditional 1g static water experiments. It provides key basic experimental data for establishing or revising underwater explosion damage assessment models considering high overload and wave environment, accurate evaluation of weapon effectiveness, deep-sea engineering safety protection, etc. It provides a highly complex but powerful multi-physics field coupling experimental research platform that can be used to expand the research of other high-speed fluid dynamics problems.

[0093] Example 2

[0094] This embodiment provides a coupling test system for wave loads and explosion physical fields under a hypergravity field, wherein the coupling test system for wave loads and explosion physical fields under a hypergravity field includes a wave simulation device and a centrifugal rotor for installing 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 loads and explosion physical fields under a hypergravity field described in any one of the first embodiments.

[0095] In the specific implementation process of the embodiment of the present invention, reference may be made to Example 1, which has corresponding technical effects.

[0096] Although the present 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 modifications and variations may be made to the exemplary embodiments of the present specification without departing from the scope or spirit of the present invention. The scope of the claims is to be given the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A coupling test method for wave load and explosion physical field under hypergravity field, characterized in that: The coupling test method of wave load and explosion physical field under the hypergravity field includes: In the hypergravity field, during the coupled test of wave load and explosion physical field, the phase of the explosion is adjusted according to the time difference between wave motion and detonation, wave stabilization time and wave period. Collect wave parameter data and explosion load data in the coupling test.

2. The coupling test method of wave load and explosion physical field under hypergravity field according to claim 1 is characterized in that: Before the coupling test of wave load and explosion physics, the following are included: Based on the scale of the preliminary test, the wave parameters and explosion parameters used in the coupling experiment are determined.

3. The coupling test method of wave load and explosion physical field under hypergravity field according to claim 2 is characterized in that: The wave parameters include wave height amplitude h m and the device motion frequency f m ; The explosion parameters include explosive equivalent W m and Explosion Deep D m ; According to the scale of the preliminary test, the wave parameters and explosion parameters used in the coupling experiment are determined using the following formula: Where n test is the scale of the preliminary test, h w is the simulated wave height, f w is the simulated wave frequency, W p is the simulated explosive equivalent, d p is the simulated blasting depth.

4. The coupling test method of wave load and explosion physical field under hypergravity field according to claim 2 is characterized in that: The coupling test method of wave load and explosion physical field under the hypergravity field also includes: Determine the test scale range based on the simulated wave frequency, the maximum frequency of the device, and the minimum frequency of the device; Determine the scale of the preliminary test within the test scale range.

5. The coupling test method of wave load and explosion physical field under hypergravity field according to claim 4 is characterized in that: The coupling test method of wave load and explosion physical field under the hypergravity field also includes: The explosive equivalent used in the coupling experiment exceeds the allowable range of the current test. The scale of the preliminary test is adjusted according to the explosive equivalent.

6. The coupling test method of wave load and explosion physical field under hypergravity field according to claim 5 is characterized in that: The scale of the preliminary test is adjusted according to the explosive equivalent using the following formula:

7. The coupling test method of wave load and explosion physical field under hypergravity field according to claim 1 is characterized in that: According to the time difference between wave movement and detonation, wave stabilization time and wave period, the following formula is used to adjust the phase of the explosion: Where Δt is the time difference between wave movement and detonation, t0 is the wave stabilization time, T w is the wave period, The phase of the explosion.

8. The coupling test method of wave load and explosion physical field under hypergravity field according to any one of claims 1 to 7, characterized in that: The coupling test method of wave load and explosion physical field under the hypergravity field also includes: During the coupling test of wave load and explosion physical field, the wave motion and initial state in the coupling test were corrected according to the deviation between the wave stability starting point and the actual value and the shooting frequency of the high-speed camera.

9. The coupling test method of wave load and explosion physical field under hypergravity field according to claim 8 is characterized in that: The following formula is used to correct the wave motion and initial state in the coupled test: Where, ε t0 is the deviation between the wave stability starting point and the actual value, f hc is the shooting frequency of high-speed camera, T W is the wave period.

10. A coupling test system for wave load and explosion physical field under hypergravity field, characterized in that: The coupling test system of wave load and explosion physical field under hypergravity field includes a wave simulation device and a centrifugal rotor for installing 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 of wave load and explosion physical field under hypergravity field as described in any one of claims 1 to 9.

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