CN110412246B - Stress transfer test device and test method for simulating impact lunar surface of detector - Google Patents
Stress transfer test device and test method for simulating impact lunar surface of detector Download PDFInfo
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- CN110412246B CN110412246B CN201910793365.7A CN201910793365A CN110412246B CN 110412246 B CN110412246 B CN 110412246B CN 201910793365 A CN201910793365 A CN 201910793365A CN 110412246 B CN110412246 B CN 110412246B
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- 238000012360 testing method Methods 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000012546 transfer Methods 0.000 title abstract description 7
- 239000002689 soil Substances 0.000 claims abstract description 121
- 230000001133 acceleration Effects 0.000 claims abstract description 62
- 230000009471 action Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000005056 compaction Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000009863 impact test Methods 0.000 claims description 3
- 230000003116 impacting effect Effects 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims 1
- 241001061260 Emmelichthys struhsakeri Species 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 241001503987 Clematis vitalba Species 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
Abstract
The invention discloses a stress transfer test device and a test method for simulating the impact of a detector on a lunar surface, wherein the device comprises a barrel, a heavy object, loose soil, a hard soil body, a pressure sensor, an acceleration sensor and a string: the weight is hung in the cylinder and connected with the pulley through a string passing through a small hole in the center of the cover plate; the bottom of the cylinder is layered with hard soil and loose soil, and a pressure sensor and an acceleration sensor are arranged in the hard soil and connected with a computer; the lunar soil is simulated by adjusting the height of the weight to simulate different speed impact, and the device is simple and convenient; the stress and acceleration distribution conditions in the hard soil body after being buffered by loose lunar soil under the action of the impact lunar surface of the detector can be obtained by arranging stress and acceleration sensors with different depths in the hard soil body.
Description
Technical Field
The invention belongs to the technical field of tunnel and underground engineering test instruments, and particularly relates to a stress transfer test device and a test method for simulating the impact of a detector on a lunar surface.
Background
The detector of the goddess Chang No. four in China successfully lands on the back of the moon on 1/3/2019, which is the first successful login of the whole human history on the back of the moon, and the exciting event is more the discussion of the moon competition in the international society. The us announced the return to space earlier in 2017, and then russia, europe, japan, india, etc. showed the advance of the lunar exploration program, which clearly is the development of a new round of space competition.
The lunar exploration project in China is carried out in three steps according to the thinking of winding, falling and returning, wherein, how to make a lunar climber land on the lunar surface safely and stably is an important research content of the lunar exploration project in the stage 2, and is also a key of the lunar exploration project and a precondition for successful lunar exploration follow-up work to be developed smoothly. Considering that the interaction between the foot pad and lunar soil during landing of the lunar rover can affect the lunar soil and the lower lunar rock thereof, how to accurately analyze the internal stress transmission condition of the lunar soil during landing of the lunar rover becomes one of important conditions for successful lunar rover landing.
It is not practical to directly carry out lunar soil pressure test on lunar surface, so that many students at home and abroad carry out experimental study on the bearing capacity of simulated lunar soil. Zhong Shiying and the like develop the influence of impact speed, impact quality and the like on the maximum acceleration and the maximum axial force of the foot pad in the impact process in the experimental study of the vertical impact model of the lander foot pad, but the measurement of the stress and the acceleration in the hard soil after being buffered by loose lunar soil under the action of the impact lunar surface of the simulated detector is deficient, and the stress and the acceleration in the hard soil cannot be measured; hao Fei and the like in TJ-1 simulated lunar soil bearing characteristic indoor test study, a bearing characteristic test of a lander foot pad on simulated lunar soil is carried out, in the test, the influence on the bearing capacity of a foundation when the lander foot pad contacts with the simulated lunar soil at different speeds is simulated by adjusting the vertical acceleration frequency, but the stress and acceleration distribution condition in a hard soil body after being buffered by loose lunar soil under the action of impact lunar surface of a simulated detector are not tested, and the influence of impact on the hard soil body cannot be determined.
The prior art described above has the following disadvantages: (1) the stress and acceleration in the hard soil body after being buffered by loose lunar soil are not simulated; (2) stress and acceleration distribution conditions simulating different depths in the hard soil after being buffered by loose lunar soil cannot be measured.
Disclosure of Invention
The invention provides a stress transfer test device and a test method for a simulated detector impact lunar surface, and aims to solve the problem that stress and acceleration distribution conditions in a hard soil body after loose lunar soil is buffered under the action of the simulated detector impact lunar surface cannot be measured at present.
The stress transfer test device for simulating the impact of the detector on the lunar surface comprises a barrel 1, a weight 2, loose soil 3, a hard soil body 4, a pressure sensor 6, an acceleration sensor 7 and a string 10;
the cylinder 1 is made of organic glass and is fixed on the metal base 8 through bolts 14; the diameter of the cylinder 1 is 1m, and the height is 2.5m; the outer wall of the cylinder 1 is provided with scale marks 5 which can be used for determining the thickness of the hard soil body 4 and the loose soil 3;
in the cylinder 1, a weight 2 with known mass is hung in the cylinder 1 and connected with a pulley 11 through a string 10 passing through a small hole in the center of a cover plate 9;
the string 10 is marked 12 every 10cm and can be used for determining the position of the weight 2;
the bottom of the cylinder 1 is layered with a hard soil body 4 and loose soil 3, and a pressure sensor 6 and an acceleration sensor 7 are arranged in the hard soil body 4, and the pressure sensor 6 and the acceleration sensor 7 are connected with a computer 13.
Further, the hard soil body 4 is formed by mixing, stirring and compacting epoxy resin and the ground and sieved soil body, and the thickness of the hard soil body is 40 cm-50 cm; the pressure sensor 6 and the acceleration sensor 7 are embedded in the compaction process of the hard soil body and form close contact with the soil body along with the hardening of the hard soil body 4;
the loose soil 3 is prepared by volcanic ash and sand soil according to a certain grading and uniformly spread on the hard soil body 4, and the thickness of the virtual pavement is changed within the range of 20 cm-60 cm.
Further, the pressure sensor 6 and the acceleration sensor 7 in the hard soil body 4 are arranged according to three layers which are 5cm,10cm and 15cm below the surface of the hard soil body (4), the sensors of different layers can measure the distribution of pressure and acceleration, each layer is provided with the pressure sensor 6 and the acceleration sensor 7 according to the transverse direction, the position of the center of the circle is provided with the pressure sensor 6, the positions of the right side of the center of the circle, 15cm and 30cm are provided with the acceleration sensor 7 and the pressure sensor 6 respectively, and the positions of the left side of the center of the circle, 15cm and 30cm are provided with the pressure sensor 6 and the acceleration sensor 7 respectively.
The test method for simulating the stress transmission of the detector impact lunar surface adopts the test device for simulating the stress transmission of the detector impact lunar surface, and comprises the following specific steps:
(1) Paving a configured hard soil body 4 with a planned thickness at the bottom of the cylinder 1, and burying a pressure sensor 6 and an acceleration sensor 7 into a specified position in the hard soil body 4 in the compaction process; waiting for 2 hours, and primarily hardening the hard soil body 4;
(2) Uniformly spreading the prepared loose soil 3 with a preset thickness on the surface of the hard soil body 4;
(3) The weight 2 is put into the cylinder 1, and the string 10 thereon passes through the hole in the center of the cover plate 9 and is connected with the pulley 11; the height of the weight 2 is adjusted by the mark 12 on the string 10;
(4) After the hard soil body 4 is fully hardened, performing impact test, cutting the string 10, allowing the weight 2 to freely fall, paving the hard soil body 4 with loose soil 3 on the impact surface, transmitting corresponding pressure data and acceleration data to the computer 13 through the pressure sensor 6 and the acceleration sensor 7, and displaying the measured stress and acceleration on the computer 13 in a curve form, thereby obtaining stress and acceleration distribution conditions.
Benefit (benefit)
The invention provides a stress transfer test device and a test method for simulating the impact of a detector on a lunar surface, wherein the device comprises a cylinder 1, a heavy object 2, loose soil 3, a hard soil body 4, a pressure sensor 6, an acceleration sensor 7 and a string 10; the cylinder 1 is made of organic glass, and is fixed on a metal base 8 through a bolt 14, a weight 2 with known mass is hung in the cylinder 1 and is connected with a pulley 11 through a string 10 with a small hole in the center of a cover plate 9, a hard soil body 4 and loose soil 3 are layered on the bottom of the cylinder 1, a pressure sensor 6 and an acceleration sensor 7 are arranged in the hard soil body 4, and the pressure sensor 6 and the acceleration sensor 7 are connected with a computer 13; the height of the weight can be adjusted through the marks on the string, the lunar soil can be simulated by the impact of different speeds, and the device is simple and convenient; the stress and acceleration distribution conditions of the hard soil body after the loose lunar soil is buffered under the action of the impact lunar surface of the detector can be obtained by simulating the arrangement of sensors with different depths in the hard soil body under the lunar soil and measuring the stress and acceleration.
Drawings
FIG. 1 is a schematic view of the structure of the device according to the present invention;
FIG. 2 is a cross-sectional view of the device of the present invention;
FIG. 3 is a plan view of a hard soil subsurface pressure sensor and acceleration sensor arrangement;
description of the reference numerals: the soil-loosening device comprises a barrel 1, a weight 2, loose soil 3, a hard soil body 4, a scale mark 5, a pressure sensor 6, an acceleration sensor 7, a metal base 8, a cover plate 9, a string 10, a pulley 11, a mark 12, a computer 13 and a bolt 14.
Detailed description of the preferred embodiments
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1 to 3, a test device for simulating stress transmission of a detector impacting a lunar surface comprises a barrel 1, a heavy object 2, loose soil 3, a hard soil body 4, a pressure sensor 6, an acceleration sensor 7 and a string 10;
the cylinder 1 is made of organic glass and is fixed on the metal base 8 through bolts 14; the diameter of the cylinder 1 is 1m, and the height is 2.5m; the outer wall of the cylinder 1 is provided with scale marks 5 which can be used for determining the thickness of the hard soil body 4 and the loose soil 3;
in the cylinder 1, a weight 2 with known mass is hung in the cylinder 1 and connected with a pulley 11 through a string 10 passing through a small hole in the center of a cover plate 9;
the string 10 is marked 12 every 10cm and can be used for determining the position of the weight 2;
the bottom of the cylinder 1 is layered with a hard soil body 4 and loose soil 3, and a pressure sensor 6 and an acceleration sensor 7 are arranged in the hard soil body 4, so that the distribution of pressure and acceleration can be measured, and the pressure sensor 6 and the acceleration sensor 7 are connected with a computer 13.
The hard soil body 4 is formed by mixing and stirring epoxy resin and ground and sieved soil body and compacting, and the thickness is 40 cm-50 cm; the pressure sensor 6 and the acceleration sensor 7 are embedded in the compaction process of the hard soil body 4 and form close contact with the soil body along with the hardening of the hard soil body 4;
the loose soil 3 is prepared by volcanic ash and sand soil according to a certain grading and uniformly spread on the hard soil body 4, and the thickness of the virtual pavement is changed within the range of 20 cm-60 cm.
The pressure sensor 6 and the acceleration sensor 7 in the hard soil body 4 are arranged according to three layers which are 5cm,10cm and 15cm below the surface of the hard soil body (4), the sensors of different layers can measure the distribution of pressure and acceleration, each layer is transversely provided with the pressure sensor 6 and the acceleration sensor 7, the position of the center of a circle is provided with the pressure sensor 6, the positions of the right 15cm and 30cm of the center of the circle are respectively provided with the acceleration sensor 7 and the pressure sensor 6, and the positions of the left 15cm and 30cm of the center of the circle are respectively provided with the pressure sensor 6 and the acceleration sensor 7.
The test method for simulating the stress transmission of the impact lunar surface of the detector adopts the test device for simulating the stress transmission of the impact lunar surface of the detector, and comprises the following specific steps:
(1) Paving a configured hard soil body 4 with a planned thickness at the bottom of the cylinder 1, and burying a pressure sensor 6 and an acceleration sensor 7 into a specified position in the hard soil body 4 in the compaction process; waiting for 2 hours, and primarily hardening the hard soil body 4;
(2) Uniformly spreading the prepared loose soil 3 with a preset thickness on the surface of the hard soil body 4;
(3) The weight 2 is put into the cylinder 1, and the string 10 thereon passes through the hole in the center of the cover plate 9 and is connected with the pulley 11; the height of the weight 2 is adjusted by the mark 12 on the string 10:
(4) After the hard soil body 4 is fully hardened, performing impact test, cutting the string 10, allowing the weight 2 to freely fall, paving the hard soil body 4 with loose soil 3 on the impact surface, transmitting corresponding pressure data and acceleration data to the computer 13 through the pressure sensor 6 and the acceleration sensor 7, and displaying the measured stress and acceleration on the computer 13 in a curve form, thereby obtaining stress and acceleration distribution conditions.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the methods and core ideas of the present invention; meanwhile, as those skilled in the art will appreciate, the present invention is not limited to the above description, since modifications may be made in the specific implementation and application scope of the present invention in accordance with the idea of the present invention.
Claims (1)
1. The test method for simulating the stress transmission of the detector impacting the lunar surface is characterized by adopting a test device for simulating the stress transmission of the detector impacting the lunar surface, wherein the test device comprises a barrel (1), a heavy object (2), loose soil (3), a hard soil body (4), a pressure sensor (6), an acceleration sensor (7) and a string (10);
the cylinder (1) is made of organic glass and is fixed on the metal base (8) through bolts (14); the diameter of the cylinder (1) is 1m, and the height is 2.5m; the outer wall of the cylinder (1) is provided with scale marks (5) which can be used for determining the thickness of the hard soil body (4) and the loose soil (3);
in the cylinder (1), a weight (2) with known mass is hung in the cylinder (1) and connected with a pulley (11) through a string (10) passing through a small hole in the center of a cover plate (9);
the string (10) is marked every 10cm and can be used for determining the position of the weight (2);
the bottom of the cylinder (1) is layered with a hard soil body (4) and loose soil (3), a pressure sensor (6) and an acceleration sensor (7) are arranged in the hard soil body (4), and the pressure sensor (6) and the acceleration sensor (7) are connected with a computer (13);
the hard soil body (4) is formed by mixing and stirring epoxy resin and ground and sieved soil body and compacting, and the thickness of the hard soil body is 40 cm-50 cm; the pressure sensor (6) and the acceleration sensor (7) are buried in the hard soil body compacting process and form close contact with the soil body along with the hardening of the hard soil body (4);
the loose soil (3) is prepared by adopting volcanic ash and sand soil according to a certain grading and uniformly spread on the hard soil body (4), and the virtual pavement thickness is changed within the range of 20 cm-60 cm;
the pressure sensor (6) and the acceleration sensor (7) in the hard soil body (4) are arranged according to three layers which are 5cm,10cm and 15cm below the surface of the hard soil body (4), the sensors of different layers can measure the distribution of pressure and acceleration, each layer is transversely provided with the pressure sensor (6) and the acceleration sensor (7), the position of the center of a circle is provided with the pressure sensor (6), the positions of the right side of the center of the circle, 15cm and 30cm are respectively provided with the acceleration sensor (7) and the pressure sensor (6), and the positions of the left side of the center of the circle, 15cm and 30cm are respectively provided with the pressure sensor (6) and the acceleration sensor (7);
the method comprises the following steps:
(1) Paving a prepared hard soil body (4) with a planned thickness at the bottom of the cylinder (1), and burying a pressure sensor (6) and an acceleration sensor (7) into a specified position in the hard soil body in the compaction process; waiting for 2 hours, and primarily hardening the hard soil body (4);
(2) Uniformly spreading the prepared loose soil (3) with a preset thickness on the surface of the hard soil body (4);
(3) Placing a weight (2) into the barrel (1), and connecting a string (10) on the weight with a pulley (11) through a hole in the center of the cover plate (9); the height of the weight (2) is adjusted through the mark (12) on the string (10);
(4) And continuously waiting for 22 hours, after the hard soil body (4) is fully hardened, performing impact test, cutting off the string (10), allowing the heavy object (2) to freely fall, paving the hard soil body (4) with loose soil (3) on the impact surface, transmitting corresponding pressure data and acceleration data to the computer (13) through the pressure sensor (6) and the acceleration sensor (7), and displaying the measured stress and acceleration on the computer (13) in a curve form, thereby obtaining the stress and acceleration distribution condition in the hard soil body after buffering by the loose lunar soil under the action of the impact lunar surface of the detector.
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2019
- 2019-08-21 CN CN201910793365.7A patent/CN110412246B/en active Active
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| CN102288347A (en) * | 2011-07-18 | 2011-12-21 | 浙江大学 | Testing device for interactive impact model of lander and soil body |
| CN103323202A (en) * | 2013-06-03 | 2013-09-25 | 吉林大学 | Lander falling weight impact test device with adjustable angles |
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| CN110412246A (en) | 2019-11-05 |
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