CN111337179A - Cross array type underwater explosion pressure load spatial distribution measuring device and system - Google Patents
Cross array type underwater explosion pressure load spatial distribution measuring device and system Download PDFInfo
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- CN111337179A CN111337179A CN202010204458.4A CN202010204458A CN111337179A CN 111337179 A CN111337179 A CN 111337179A CN 202010204458 A CN202010204458 A CN 202010204458A CN 111337179 A CN111337179 A CN 111337179A
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- hopkinson bar
- target plate
- measuring element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/14—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force of explosions; for measuring the energy of projectiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0052—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to impact
Abstract
The invention belongs to the technical field of design of underwater explosion pressure sensors, and particularly relates to a cross array type underwater explosion pressure load spatial distribution measuring device and system. The invention fully utilizes the transmission and reflection rules of the stress wave in the one-dimensional rod, designs the cross array type load transmission separation device, transmits the stress wave transmitted from the Hopkinson rod measuring element into the flyer, and the flyer carries the stress wave pulse caused by the complete shock wave load to be separated from the contact with the Hopkinson rod measuring element, thereby realizing the separation of the shock wave load from the Hopkinson rod measuring element. The invention designs the cross array type flyer limiting and recycling device, restrains the vertical and transverse displacement of the high-speed moving flyer, and ensures the safe recycling of the flyer. The invention takes the Hopkinson bar as a sensitive element, has huge measuring range and sensitive element strength, and meets the requirement of realizing accurate measurement of the spatial distribution of the underwater explosion shock wave and the bubble jet load under the severe near-field underwater explosion measurement condition.
Description
Technical Field
The invention belongs to the technical field of design of underwater explosion pressure sensors, and particularly relates to a cross array type underwater explosion pressure load spatial distribution measuring device and system.
Background
With the rapid development of the underwater weapon guidance technology, the probability that the underwater weapon forms an extremely near field explosion or even contacts the explosion near a ship structure is higher and higher, and the consideration of ship vitality design provides higher requirements for surface load prediction and measurement of the underwater near field explosion structure. The current free field pressure load measurement technology is mature, and can realize accurate measurement of free field explosion pressure, but a mature and reliable measurement method is not formed at home and abroad in the aspect of measurement of the surface pressure load spatial distribution of a structure under the near-field underwater explosion condition.
The piezoelectric or piezoresistive wall pressure sensor obtained by packaging sensitive materials such as quartz crystal, piezoelectric ceramic and the like has the defects of small measuring range, frequency response which cannot meet the requirement of underwater explosion high-frequency component acquisition, high cost and the like, and sensitive elements which cannot bear the severe conditions of underwater explosion cannot have high strength; the thin film type sensor is usually difficult to bear severe environments such as extremely high pressure peak value of underwater near field explosion shock wave, detonation product impact, high temperature condition and the like due to the installation and fixation mode of the thin film type sensor adhered to the surface of a structure.
Disclosure of Invention
The invention aims to provide a cross array type underwater explosion pressure load spatial distribution measuring device which can bear the severe measuring condition of near-field underwater explosion and accurately measure the spatial distribution of underwater explosion shock waves and bubble jet flow loads.
The purpose of the invention is realized by the following technical scheme: comprises a protective outer cylinder; the bottom of the protective outer cylinder is provided with a target plate, a target plate cover plate is arranged on the target plate, and coaxial mounting holes are formed in the target plate and the target plate cover plate; a cross array type Hopkinson bar measuring element is arranged in the protective outer cylinder, and a first cross open hole positioning plate and a second cross open hole positioning plate are arranged on an inner ring rib of the protective outer cylinder; the second crossed tapping positioning plate is positioned above the first crossed tapping positioning plate, and the first crossed tapping positioning plate and the second crossed tapping positioning plate are provided with the same holes; a load transmission separation base is arranged above each hole of the first cross-shaped perforated positioning plate; a flyer limiting and recycling base is arranged above each hole of the second crossed hole positioning plate; the cross array type Hopkinson bar measuring elements consist of a group of Hopkinson bar measuring elements arranged in a cross array; the bottom measuring end of the Hopkinson bar measuring element penetrates through the target plate and the mounting holes in the target plate cover plate and is flush with the surface of the target plate; the upper end of the Hopkinson bar measuring element passes through a corresponding hole in the first cross-shaped perforated positioning plate and enters the load transmission separation base; a flying piece is arranged in the load transmission separation base, the bottom end of the flying piece is coaxially overlapped at the top end of the Hopkinson bar measuring element, and the contact surface of the flying piece and the Hopkinson bar measuring element is polished to be flat and smooth and is coated with grease; the top end of the flyer penetrates through the load transmission separation base and is arranged at the lower end of the interior of the flyer limiting and recycling base through a corresponding hole in the second cross-shaped perforated positioning plate; the upper end of the interior of the flying piece limiting and recycling base is provided with a rubber damping column which is coaxial with the flying piece.
The present invention may further comprise:
ball linear bearings are arranged in the load transmission separation base and the flyer limiting recovery base; the ball linear bearing is coaxially positioned inside the load transmission separation base and the flying piece limiting and recycling base in a threaded connection mode through the ball linear bearing positioner.
An outer sealing ring is arranged between the protective outer cylinder and the target plate; an inner sealing ring is arranged between the target plate cover plate and the target plate; the Hopkinson bar measuring element is provided with a Hopkinson bar measuring element sealing ring at the joint of the Hopkinson bar measuring element and the target plate, and the Hopkinson bar measuring element sealing ring is clamped between the target plate and the target plate cover plate.
The invention also aims to provide a cross array type underwater explosion pressure load spatial distribution measuring system.
The purpose of the invention is realized by the following technical scheme: the device comprises a cross array type underwater explosion pressure load spatial distribution measuring device, an experimental water tank, a high-speed camera, a light source and data acquisition equipment; an underwater explosion source is arranged in the experimental water tank; the cross array type underwater explosion pressure load spatial distribution measuring device is arranged in the experiment water tank through a supporting frame; the light source, the underwater explosion source and the high-speed camera lens axis are at the same height; the cross array type underwater explosion pressure load spatial distribution measuring device comprises a protective outer cylinder; the bottom of the protective outer cylinder is provided with a target plate, a target plate cover plate is arranged on the target plate, and coaxial mounting holes are formed in the target plate and the target plate cover plate; a cross array type Hopkinson bar measuring element is arranged in the protective outer cylinder, and a first cross open hole positioning plate and a second cross open hole positioning plate are arranged on an inner ring rib of the protective outer cylinder; the second crossed tapping positioning plate is positioned above the first crossed tapping positioning plate, and the first crossed tapping positioning plate and the second crossed tapping positioning plate are provided with the same holes; a load transmission separation base is arranged above each hole of the first cross-shaped perforated positioning plate; a flyer limiting and recycling base is arranged above each hole of the second crossed hole positioning plate; the cross array type Hopkinson bar measuring elements consist of a group of Hopkinson bar measuring elements arranged in a cross array; the bottom measuring end of the Hopkinson bar measuring element penetrates through the target plate and the mounting holes in the target plate cover plate and is flush with the surface of the target plate; the upper end of the Hopkinson bar measuring element passes through a corresponding hole in the first cross-shaped perforated positioning plate and enters the load transmission separation base; a flying piece is arranged in the load transmission separation base, the bottom end of the flying piece is coaxially overlapped at the top end of the Hopkinson bar measuring element, and the contact surface of the flying piece and the Hopkinson bar measuring element is polished to be flat and smooth and is coated with grease; the top end of the flyer penetrates through the load transmission separation base and is arranged at the lower end of the interior of the flyer limiting and recycling base through a corresponding hole in the second cross-shaped perforated positioning plate; the upper end of the interior of the flying piece limiting and recycling base is provided with a rubber damping column which is coaxial with the flying piece.
The present invention may further comprise:
ball linear bearings are arranged in the load transmission separation base and the flyer limiting recovery base; the ball linear bearing is coaxially positioned inside the load transmission separation base and the flying piece limiting and recycling base in a threaded connection mode through the ball linear bearing positioner.
An outer sealing ring is arranged between the protective outer cylinder and the target plate; an inner sealing ring is arranged between the target plate cover plate and the target plate; the Hopkinson bar measuring element is provided with a Hopkinson bar measuring element sealing ring at the joint of the Hopkinson bar measuring element and the target plate, and the Hopkinson bar measuring element sealing ring is clamped between the target plate and the target plate cover plate.
The experimental water tank main body frame is of a steel structure, and the middle parts of two opposite surfaces of the water tank are transparent resin plates.
The invention has the beneficial effects that:
the invention fully utilizes the transmission and reflection rules of the stress wave in the one-dimensional rod, designs the cross array type load transmission separation device, transmits the stress wave transmitted from the Hopkinson rod measuring element into the flyer, and the flyer carries the stress wave pulse caused by the complete shock wave load to be separated from the contact with the Hopkinson rod measuring element, thereby realizing the separation of the shock wave load from the Hopkinson rod measuring element. The invention designs the cross array type flyer limiting and recycling device, restrains the vertical and transverse displacement of the high-speed moving flyer, and ensures the safe recycling of the flyer. The invention takes the Hopkinson bar as a sensitive element, has huge measuring range and sensitive element strength, and meets the requirement of realizing accurate measurement of the spatial distribution of the underwater explosion shock wave and the bubble jet load under the severe near-field underwater explosion measurement condition.
Drawings
Fig. 1(a) is an external axonometric view of a cross array type underwater explosion pressure load spatial distribution measuring device.
Fig. 1(b) is an internal axial view of a cross array type underwater explosion pressure load spatial distribution measuring device.
Fig. 2 is a cross sectional view of a cross array type underwater explosion pressure load spatial distribution measuring device.
FIG. 3 is an enlarged detail view of the cross array Hopkinson bar measurement cell.
Fig. 4 is an enlarged view of the detail of the load transmission separating device.
Fig. 5 is an enlarged detail view of the flyer limiting and recovering device.
Fig. 6 is a general layout diagram of a cross array type underwater explosion pressure load space distribution measuring system.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to a cross array type underwater explosion pressure load spatial distribution measuring device 1 based on Hopkinson bars. The pressure load continuous measuring device is mainly used for the spatial distribution of spherical shock wave pressure load and bubble jet load generated by underwater near-field explosion on the surface of a structure, and the pressure load measuring device 1 comprises: and the cross array type Hopkinson bar load measuring element 7 is used for continuously measuring the spatial distribution of the underwater near-field explosion shock wave and the bubble jet load on the surface of the target plate. The cross array type load transmission separation device 8 has the main function that the shock wave pressure load passes through the contact surface between the Hopkinson bar 706 and the flying plate 806, and after the shock wave pressure load completely transmits into the flying plate 806, the flying plate 806 is separated from the contact with the Hopkinson bar 706, so that the shock wave pressure load is separated. The cross array type flyer limiting and recycling device 9 has the main function of limiting vertical displacement and transverse displacement of the flyers 806 after high-speed separation and contact with the Hopkinson bar 706.
A cross array type underwater explosion pressure load spatial distribution measuring device 1 based on Hopkinson bars is mainly used for measuring the board surface spatial distribution of a target board of shock wave pressure load and bubble jet flow load of underwater near-field explosion, and the pressure load spatial distribution measuring device 1 comprises:
and the cross array Hopkinson bar measuring element 7 is used for continuously measuring the spatial distribution of the underwater near-field explosion shock wave and the bubble jet wall pressure load at the target plate.
The shock wave pressure load transmission separation device is used for realizing the separation of shock wave pressure loads: the shock wave pressure load passes through the interface of the hopkinson rod measurement element 706 with the flyer 806 and after being fully transmitted into the flyer 806, the flyer 806 comes out of contact with the hopkinson rod measurement element 706.
And the cross array type flyer limiting and recycling device 9 has the main function of limiting the vertical displacement and the transverse displacement of the flyer 806 after the flyer 806 is separated from the contact with the Hopkinson bar measuring element 706 at a high speed.
The cross array type Hopkinson bar measuring element 7 comprises a Hopkinson bar measuring element 706, a strain gauge 709, a Hopkinson bar measuring element sealing ring 710, a target plate 703, a protective outer cylinder 701, an outer sealing ring 708, an inner sealing ring 707, a target plate cover plate 704, an inner hexagonal bolt & nut 702 and a target plate cover plate mounting nut 705.
The target plate 703 is fixed with the protective outer cylinder 701 and the target plate cover plate 704 in a bolt connection 702 mode, the outer sealing ring 708 is arranged between the protective outer cylinder 701 and the target plate 703, and the inner sealing ring 707 is arranged between the target plate cover plate 704 and the target plate 703; the Hopkinson bar measuring element 706 penetrates through a Hopkinson bar measuring element sealing ring 710 clamped between the target plate 703 and the target plate cover plate 704, and is coaxially mounted in mounting holes formed in the target plate 703 and the target plate cover plate 704, the measuring end is flush with the surface of the target plate 703, and the strain gauge 709 is symmetrically adhered to the measuring end of the Hopkinson bar measuring element 706.
The cross array type load transmission separation device 8 comprises a protective outer cylinder 701, a first cross open hole positioning plate 801, a shock wave load transmission separation base 803, a Hopkinson bar measuring element 706, a flying plate 806, a Hopkinson bar positioning ball 807, a positioning pre-tightening spring 808, a positioning pre-tightening bolt 802, a first inner hexagonal bolt nut 809, a second inner hexagonal bolt nut 810, a first ball linear bearing 804 and a first ball linear bearing positioner 805.
The first cross-shaped opening positioning plate 801 is fixed on an inner ring rib of the protective outer cylinder 701 in a bolt connection mode, the load transmission separation base 803 is installed on the first cross-shaped opening positioning plate 801 in a bolt connection mode, the first ball linear bearing positioner 805 coaxially positions the first ball linear bearing 804 inside the load transmission separation base 803 in a threaded connection mode, the Hopkinson bar positioning ball 807, the positioning pre-tightening spring 808 and the positioning pre-tightening bolt 802 coaxially position the Hopkinson bar measuring element 706 inside the load transmission separation base 803, the flying plate 806 is coaxially overlapped above the Hopkinson bar measuring element 706, and the contact surface of the flying plate 806 and the Hopkinson bar measuring element 706 is coated with grease.
The cross array type flyer limiting and recycling device 9 comprises a protective outer cylinder 701, a second crossed hole positioning plate 901, a flyer limiting and recycling base 902, a flyer 806, a third hexagon socket head cap screw nut 906, a fourth hexagon socket head cap screw nut 907, a rubber damping column 904, a second ball linear bearing 903 and a second ball linear bearing positioner 905.
The second cross-shaped hole positioning plate 901 is fixed on an inner ring rib of the protective outer cylinder 701 in a bolt connection mode, the flyer limiting and recycling base 902 is installed on the second cross-shaped hole positioning plate 901 in a bolt connection mode, the rubber damping columns 907 are coaxially fixed inside the flyer limiting and recycling base 902, the second ball linear bearing positioning devices 905 coaxially position the second ball linear bearings 903 inside the flyer limiting and recycling base 902 in a threaded connection mode, and the flyers 806 move in the limited axial direction inside the base.
The technical problem to be solved by the invention is as follows: the underwater explosion load measuring device can bear the severe measuring condition of near-field underwater explosion and accurately measure the spatial distribution of underwater explosion shock waves and bubble jet flow loads. The invention has the characteristics and advantages that:
the invention uses the cross array Hopkinson bar 706 as a sensitive element, and realizes the continuous measurement of the space distribution of the underwater explosion shock wave and the bubble jet flow load. The invention fully utilizes the transmission and reflection rules of stress waves in a one-dimensional rod, provides a cross array type load transmission and separation device 8, transmits the stress waves transmitted from a Hopkinson rod measuring element 706 into a flyer 806, and the flyer 806 carries stress wave pulses caused by complete shock wave loads to be separated from the contact with the Hopkinson rod measuring element 706, so as to realize the separation of the shock wave loads from the Hopkinson rod measuring element 706. The measuring device using the Hopkinson bar 706 as the sensitive element is made of aluminum alloy or steel, is convenient to process, install and debug, is low in use cost, has huge measuring range and sensitive element strength, and meets the requirement of realizing accurate measurement of the spatial distribution of the underwater explosion shock wave and the bubble jet flow load under the severe near-field underwater explosion measuring condition.
The experimental environment, the main structure and the using process of the underwater explosion pressure load space distribution measuring device are described in the following with reference to the attached drawings.
1. Test operating environment
A cross array type underwater explosion pressure load spatial distribution measuring system is shown in figure 6, except for a main body of the invention, namely a cross array type underwater explosion pressure load spatial distribution measuring device 1, an experimental device supporting frame 2 is required; an experimental water tank 3; a high-speed camera 4; a light source 5; a data acquisition device 6.
The annular rib on the outer side of the cross array type underwater explosion pressure load space distribution measuring device 1 is provided with a mounting hole, the mounting hole is positioned and mounted on the experimental device supporting frame 2 in a bolt connection mode, a main body frame of the experimental water tank 3 is a steel structure, the middle parts of two opposite surfaces of the water tank are transparent resin plates, and observation before experiment and optical image acquisition of the high-speed camera 4 are facilitated. The light source 5 is a direct current light source, and the constant brightness of the background light is ensured when the high-speed camera 4 collects images. In the experiment, the light source 5, the underwater explosion source and the lens axis of the high-speed camera 4 are at the same height. The data acquisition system 6 is arranged on the experiment table, comprises a strain gauge, an oscilloscope, an amplifier, a data acquisition interface, a computer and other equipment and is used for controlling detonation of an explosion source, underwater explosion load, optical image acquisition and the like.
2. Cross array type underwater explosion pressure load spatial distribution measuring device
The pressure distribution measuring device main body is sequentially provided with a cross array Hopkinson bar measuring element 7, a cross array load transmission separation device 8 and a cross array flying piece limiting and recycling device 9 from bottom to top.
The cross array type Hopkinson bar measuring element 7 is composed of a Hopkinson bar measuring element 706, a strain gauge 709, a Hopkinson bar measuring element sealing ring 710, a target plate 703, a protective outer cylinder 701, an outer sealing ring 708, an inner sealing ring 707, a target plate cover plate 704 and an inner hexagon bolt nut 702. The target plate 703 is fixed with the protective outer cylinder 701 and the target plate cover plate 704 in a bolt connection mode, the outer sealing ring 708 is arranged between the protective outer cylinder 701 and the target plate 703, and the inner sealing ring 707 is arranged between the target plate cover plate 704 and the target plate 703; the Hopkinson bar 706 penetrates through a Hopkinson bar measuring element sealing ring 710 clamped between the target plate 703 and the target plate cover plate 704, and is coaxially mounted in mounting holes formed in the target plate 703 and the target plate cover plate 704, the measuring end is flush with the surface of the target plate 703, and the strain gauge 709 is symmetrically adhered to the measuring end of the Hopkinson bar measuring element 706.
Shock wave load and bubble jet load generated by underwater explosion are loaded on the end face of the cross array Hopkinson bar measuring element, are transmitted into the measuring element and then are propagated in the bar in the form of longitudinal waves of stress waves, strain gauges 706 symmetrically adhered to two sides of the measuring element record strain of the measuring element, and then the amplitude of the stress waves propagated in the measuring element and the spatial distribution of the load loaded at the end part of the measuring element, namely the plate surface of the target plate 703 can be reversely deduced.
The cross array type load transmission separation device 8 comprises a protective outer cylinder 701, a first cross open hole positioning plate 801, a load transmission separation base 803, a Hopkinson bar measuring element 706, a flying plate 806, a Hopkinson bar positioning ball 807, a positioning pre-tightening spring 808, a positioning pre-tightening bolt 802, a first ball linear bearing 804 and a first ball linear bearing positioner 805. The first cross-shaped opening positioning plate 801 is fixed on an inner ring rib of the protective outer cylinder 701 in a bolt connection mode, the load transmission separation base 803 is installed on the first cross-shaped opening positioning plate 801 in a bolt connection mode, the first ball linear bearing 804 is coaxially positioned inside the load transmission separation base 803 by the first ball linear bearing positioner 805 in a threaded connection mode, the Hopkinson bar positioning ball 807, the positioning pre-tightening spring 808 and the positioning pre-tightening bolt 802 coaxially position the Hopkinson bar measuring element 706 inside the load transmission separation base 803, the flying plate 806 is coaxially overlapped above the Hopkinson bar measuring element 706, and the contact surface of the flying plate 806 and the Hopkinson bar measuring element 706 is polished to be flat and smooth and is coated with grease.
The longitudinal wave of the stress wave generated by the shock wave load is transmitted to the contact surface of the flyer 806 and the Hopkinson bar measuring element 706 in the Hopkinson bar measuring element 706, the flyer 806 and the Hopkinson bar measuring element 706 are made of rod pieces with completely the same materials and interfaces, according to the stress wave transmission theory, the longitudinal wave is completely transmitted into the flyer 806, the longitudinal wave is transmitted to the free end of the flyer 806, according to the stress wave theory, a tensile wave is obtained by reflection at the free end, after the tensile wave is transmitted to the contact surface of the flyer 806 and the Hopkinson bar measuring element 706, the grease cannot bear net tensile force caused by the tensile wave, the flyer 806 separates the stress pulse generated by the complete shock wave load from the contact with the Hopkinson bar measuring element 706 at high speed, the Hopkinson bar measuring element 706 is kept at a fixed installation position under the clamping of the pre-tightening ball 807, and therefore the Hopkinson bar measuring element 706 is in a stress-free pulse state, the shock wave load transmission separation device 8 realizes the function of separating the shock wave load from the measuring element and provides preparation for the following measurement of the space distribution of the bubble jet load without reflected wave interference.
The cross array type flyer limiting and recycling device 9 comprises a protective outer cylinder 701, a second crossed opening positioning plate 901, a flyer limiting and recycling base 902, a flyer 806, a rubber damping column 904, a second ball linear bearing 903 and a second ball linear bearing positioner 905. The second cross-shaped perforated positioning plate 901 is fixed on an inner ring rib of the protective outer cylinder 701 in a bolt connection mode, the flyer limiting recovery base 902 is installed on the second cross-shaped perforated positioning plate 901 in a bolt connection mode, the rubber damping column 904 is coaxially fixed inside the flyer limiting recovery base 902, the second ball linear bearing positioning device 905 coaxially positions the second ball linear bearing 903 inside the flyer limiting recovery base 902 in a thread connection mode, and one end of the flyer 806 is arranged at the lower end of an inner cylinder of the flyer limiting recovery base 902.
After the flyer 806 separates stress pulses generated by loading of the loaded complete shock waves at a high speed and contacts with the Hopkinson bar measuring element 706, the stress pulses only can vertically move under the restraint of the flyer limiting and recycling device 9, after the flyer 806 contacts with the rubber damping column 904, kinetic energy of the flyer is converted into deformation energy of the rubber damping column 904 in a large amount, and then the flyer 806 changes the moving direction and moves downwards in a free falling body until the stress pulses contact with the end face of the Hopkinson bar measuring element 706 again. The duration time of the underwater explosion load is extremely short and is far shorter than the time of the flying piece 806 separating from the free falling body, so that the compressive stress pulse generated by the flying piece 806 and the Hopkinson bar measuring element 706 recovering contact is greatly later than the bubble jet flow measuring time, and the measurement of the bubble jet flow load stage cannot be influenced.
3. Test operation flow
The use process of the underwater explosion pressure load space distribution measuring device provided by the invention is as follows:
1) assembling the underwater explosion pressure load spatial distribution measuring device 1 in the experimental environment shown in fig. 6, laying and spatially positioning the underwater explosion sources in the experimental water tank 3, hoisting the underwater explosion pressure load spatial distribution measuring device 1 to the test device supporting frame 2 on the experimental water tank 3, and connecting the test device and the experimental frame through bolts.
2) Adjusting the height and brightness of the light source 5; and adjusting shooting parameters of the high-speed camera 4, focusing a lens to the distance of the explosion source, and ensuring that the high-speed camera 4 can completely record an optical image of underwater explosion bubble movement.
3) And joint debugging is carried out on the data acquisition equipment 6 and the high-speed camera 4, and whether the synchronous trigger system works well is tested.
4) The detonation source, the data acquisition equipment 6 and the high-speed camera 4 are synchronously triggered, after the detonation source explodes, shock waves are firstly radiated outwards, then underwater explosion bubbles formed by detonation products pulsate in water, and the bubbles form jet flow on the wall surface of a target plate of the measuring device. Recording the time-space distribution of the shock wave load and the bubble jet load on the wall surface of the target plate by the data acquisition equipment 6; the high speed camera 4 records an optical image of the underwater explosion bubble pulsation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a cross array underwater explosion pressure load spatial distribution measuring device which characterized in that: comprises a protective outer cylinder; the bottom of the protective outer cylinder is provided with a target plate, a target plate cover plate is arranged on the target plate, and coaxial mounting holes are formed in the target plate and the target plate cover plate; a cross array type Hopkinson bar measuring element is arranged in the protective outer cylinder, and a first cross open hole positioning plate and a second cross open hole positioning plate are arranged on an inner ring rib of the protective outer cylinder; the second crossed tapping positioning plate is positioned above the first crossed tapping positioning plate, and the first crossed tapping positioning plate and the second crossed tapping positioning plate are provided with the same holes; a load transmission separation base is arranged above each hole of the first cross-shaped perforated positioning plate; a flyer limiting and recycling base is arranged above each hole of the second crossed hole positioning plate; the cross array type Hopkinson bar measuring elements consist of a group of Hopkinson bar measuring elements arranged in a cross array; the bottom measuring end of the Hopkinson bar measuring element penetrates through the target plate and the mounting holes in the target plate cover plate and is flush with the surface of the target plate; the upper end of the Hopkinson bar measuring element passes through a corresponding hole in the first cross-shaped perforated positioning plate and enters the load transmission separation base; a flying piece is arranged in the load transmission separation base, the bottom end of the flying piece is coaxially overlapped at the top end of the Hopkinson bar measuring element, and the contact surface of the flying piece and the Hopkinson bar measuring element is polished to be flat and smooth and is coated with grease; the top end of the flyer penetrates through the load transmission separation base and is arranged at the lower end of the interior of the flyer limiting and recycling base through a corresponding hole in the second cross-shaped perforated positioning plate; the upper end of the interior of the flying piece limiting and recycling base is provided with a rubber damping column which is coaxial with the flying piece.
2. The cross array type underwater explosion pressure load spatial distribution measuring device according to claim 1, characterized in that: ball linear bearings are arranged in the load transmission separation base and the flyer limiting recovery base; the ball linear bearing is coaxially positioned inside the load transmission separation base and the flying piece limiting and recycling base in a threaded connection mode through the ball linear bearing positioner.
3. The cross array type underwater explosion pressure load spatial distribution measuring device according to claim 1 or 2, wherein: an outer sealing ring is arranged between the protective outer cylinder and the target plate; an inner sealing ring is arranged between the target plate cover plate and the target plate; the Hopkinson bar measuring element is provided with a Hopkinson bar measuring element sealing ring at the joint of the Hopkinson bar measuring element and the target plate, and the Hopkinson bar measuring element sealing ring is clamped between the target plate and the target plate cover plate.
4. The utility model provides a cross array underwater explosion pressure load spatial distribution measurement system which characterized in that: the device comprises a cross array type underwater explosion pressure load spatial distribution measuring device, an experimental water tank, a high-speed camera, a light source and data acquisition equipment; an underwater explosion source is arranged in the experimental water tank; the cross array type underwater explosion pressure load spatial distribution measuring device is arranged in the experiment water tank through a supporting frame; the light source, the underwater explosion source and the high-speed camera lens axis are at the same height; the cross array type underwater explosion pressure load spatial distribution measuring device comprises a protective outer cylinder; the bottom of the protective outer cylinder is provided with a target plate, a target plate cover plate is arranged on the target plate, and coaxial mounting holes are formed in the target plate and the target plate cover plate; a cross array type Hopkinson bar measuring element is arranged in the protective outer cylinder, and a first cross open hole positioning plate and a second cross open hole positioning plate are arranged on an inner ring rib of the protective outer cylinder; the second crossed tapping positioning plate is positioned above the first crossed tapping positioning plate, and the first crossed tapping positioning plate and the second crossed tapping positioning plate are provided with the same holes; a load transmission separation base is arranged above each hole of the first cross-shaped perforated positioning plate; a flyer limiting and recycling base is arranged above each hole of the second crossed hole positioning plate; the cross array type Hopkinson bar measuring elements consist of a group of Hopkinson bar measuring elements arranged in a cross array; the bottom measuring end of the Hopkinson bar measuring element penetrates through the target plate and the mounting holes in the target plate cover plate and is flush with the surface of the target plate; the upper end of the Hopkinson bar measuring element passes through a corresponding hole in the first cross-shaped perforated positioning plate and enters the load transmission separation base; a flying piece is arranged in the load transmission separation base, the bottom end of the flying piece is coaxially overlapped at the top end of the Hopkinson bar measuring element, and the contact surface of the flying piece and the Hopkinson bar measuring element is polished to be flat and smooth and is coated with grease; the top end of the flyer penetrates through the load transmission separation base and is arranged at the lower end of the interior of the flyer limiting and recycling base through a corresponding hole in the second cross-shaped perforated positioning plate; the upper end of the interior of the flying piece limiting and recycling base is provided with a rubber damping column which is coaxial with the flying piece.
5. The cross array type underwater explosion pressure load spatial distribution measuring system according to claim 4, wherein: ball linear bearings are arranged in the load transmission separation base and the flyer limiting recovery base; the ball linear bearing is coaxially positioned inside the load transmission separation base and the flying piece limiting and recycling base in a threaded connection mode through the ball linear bearing positioner.
6. The cross array type underwater explosion pressure load spatial distribution measuring system according to claim 4 or 5, wherein: an outer sealing ring is arranged between the protective outer cylinder and the target plate; an inner sealing ring is arranged between the target plate cover plate and the target plate; the Hopkinson bar measuring element is provided with a Hopkinson bar measuring element sealing ring at the joint of the Hopkinson bar measuring element and the target plate, and the Hopkinson bar measuring element sealing ring is clamped between the target plate and the target plate cover plate.
7. The cross array type underwater explosion pressure load spatial distribution measuring system according to claim 4 or 5, wherein: the experimental water tank main body frame is of a steel structure, and the middle parts of two opposite surfaces of the water tank are transparent resin plates.
8. The cross array type underwater explosion pressure load spatial distribution measuring system according to claim 6, wherein: the experimental water tank main body frame is of a steel structure, and the middle parts of two opposite surfaces of the water tank are transparent resin plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010204458.4A CN111337179B (en) | 2020-03-21 | 2020-03-21 | Cross array type underwater explosion pressure load spatial distribution measuring device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010204458.4A CN111337179B (en) | 2020-03-21 | 2020-03-21 | Cross array type underwater explosion pressure load spatial distribution measuring device and system |
Publications (2)
| Publication Number | Publication Date |
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| CN111337179A true CN111337179A (en) | 2020-06-26 |
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