CN105300769A - Preparation method of simulated moon soil with characteristic of high compactness in vacuum simulation environment - Google Patents

Preparation method of simulated moon soil with characteristic of high compactness in vacuum simulation environment Download PDF

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CN105300769A
CN105300769A CN201510809459.0A CN201510809459A CN105300769A CN 105300769 A CN105300769 A CN 105300769A CN 201510809459 A CN201510809459 A CN 201510809459A CN 105300769 A CN105300769 A CN 105300769A
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lunar soil
simulative
vacuum
soil
cylinder
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CN105300769B (en
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赵曾
赖小明
丁希仑
宫顼
尹忠旺
莫桂冬
王静
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Beijing Satellite Manufacturing Factory Co Ltd
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Abstract

The invention discloses a preparation method of a simulated moon soil with a characteristic of high compactness in a vacuum simulation environment. The preparation method comprises the following steps: at first, fixing a moon soil cylinder (102a) on a three-dimensional vibration platform (4), choosing granular alkaline olivine basalt as the raw material of simulated moon soil, mixing, stirring to obtain simulated moon soil, weighing simulated moon soil for several times, filling the simulated moon soil into the moon soil cylinder (102a), vibrating the moon soil cylinder (102a) so as to obtain simulated moon soil with a maximal dry density, finally detecting the relative compactness of simulated moon soil to obtain simulated moon soil with a characteristic of high compactness, and vacuumizing the moon soil cylinder (102a) to obtain simulated moon soil, which has a characteristic of high compactness in a vacuum simulation environment. The difference of size grading between simulated moon soil and real moon soil is eliminated through grain gradation of simulated moon soil, mixing, and stirring. Moreover, the vacuumizing is carried out in the bottom of simulated moon soil so as to avoid the relative loosening of simulated moon soil, and thus the high compactness characteristic of simulated moon soil is guaranteed.

Description

There is in vacuum simulated environment the simulative lunar soil preparation method of high solidity feature
Technical field
The present invention relates to space resources Detection Techniques field, particularly there is in a kind of vacuum simulated environment the simulative lunar soil preparation method of high solidity feature.
Background technology
Drill through the vital task that sampling is China Lunar Exploration Program three phase, the deep lunar soil of what its drilling tool plane was right is high solidity under vacuum environment, low heat conductivity, interaction can produce a large amount of heats, and lunar surface sampling work process does not have the dry powder of liquid coolant to creep into, easily cause the temperature of drilling tool to raise fast, core bit may be caused to lose efficacy and even cannot continue to creep into.Therefore, in order to carry out the test of vacuum drilling thermal characteristics, determining ultimate temperature border and selecting rational Drilling Techno-logical, there is under needing to be prepared in vacuum simulated environment the simulative lunar soil of high solidity feature.
The simulative lunar soil preparation in vacuum simulated environment with high solidity feature mainly contains 2 technological difficulties, and one is the design feature that simulative lunar soil has fine and closely woven consolidation, and gas molecule is wherein difficult to discharge, and makes simulative lunar soil be difficult to reach vacuum tightness index request; Two is in the process vacuumized, be easy to cause simulative lunar soil volumetric expansion and relative loose, causes the relative compaction of simulative lunar soil to decline, thus reduces the key physical mechanical index such as angle of friction, cohesion, dilatancy.The simulative lunar soil under there is no vacuum simulated environment at present with high solidity feature prepares precedent.
Summary of the invention
The technical matters that the present invention solves is: overcome the deficiencies in the prior art, and provide a kind of prior art that solves preparation cannot have the simulative lunar soil preparation method in the vacuum simulated environment of the height equivalence simulative lunar soil problem of the physico mechanical characteristic such as 100% superelevation packing, large angle of friction, high cohesion, high dilatancy with high solidity feature under the environment of simulation lunar surface vacuum.
Technical solution of the present invention is: the simulative lunar soil preparation method in vacuum simulated environment with high solidity feature, comprises the steps:
A, lunar soil cylinder is vertically fastened on three-dimensional vibrating platform; The right cylinder that described lunar soil cylinder is inwall, diapire is provided with bleeder vent;
B, choose particle shape alkaliolivinebasalt as simulative lunar soil starting material and mix and blend, obtain simulative lunar soil, wherein, particle shape alkaliolivinebasalt comprises the alkaliolivinebasalt of angular, subangular;
C, take quality m nsimulative lunar soil be filled in lunar soil cylinder, then by floating for simulative lunar soil surface, wherein, the initial value of n is 1, n=1,2,3 ... N, m nit is the simulative lunar soil quality taking for n-th time and put in lunar soil cylinder;
D, counterweight is placed on lunar soil cylinder, covers lunar soil nozzle with dust-proof pocket;
E, make three-dimensional vibrating platform first in above-below direction vibration, then in left and right, front and back, upper and lower three directions vibrate simultaneously, the simulative lunar soil height h' after measuring vibrations n; Described h' nfor adding n-th simulative lunar soil and height after vibration;
F, according to vibration after simulative lunar soil height h' ndensity p after the vibration of calculating simulation lunar soil dfor
ρ d = 4 Σ 1 n m n πD 2 h ′
Wherein, D is lunar soil cylinder internal diameter;
If density p after simulative lunar soil vibration dreach the maximum dry density of simulative lunar soil, then stop vibration, otherwise continue to vibrate in X, Y, Z tri-directions simultaneously, until density p after simulative lunar soil vibration dreach the maximum dry density of simulative lunar soil;
G, n=n+1, repeat step (c) ~ (f), until n=N, wherein, m alwaysfor required simulative lunar soil quality;
H, mass body area method is utilized to measure simulative lunar soil relative compaction D rfor
Wherein, h alwaysfor N time add simulative lunar soil and vibration after height, when the size grading ratio of more than 5mm in simulative lunar soil is not more than 6%, ρ ' dmax=ρ dmax, ρ ' dmin=ρ dmin, ρ dmaxfor simulative lunar soil maximum dry density, ρ dminfor simulative lunar soil experimental relationship, when the size grading ratio of more than 5mm in simulative lunar soil is greater than 6%,
ρ d m a x ′ = 1 1 - P 5 ρ d m a x + P 5 ρ 5
ρ d min ′ = 1 1 - P 5 ρ d m i n + P 5 ρ 5
If simulative lunar soil relative compaction D rbe greater than 100%, then prepare up to standard, obtain the simulative lunar soil of high solidity feature, otherwise preparation does not have up to standard, wherein, ρ 5for particle diameter in simulative lunar soil is the particle density of more than 5mm, P 5for the size grading ratio of more than 5mm in simulative lunar soil.
I, lunar soil cylinder to be hung in vacuum tank system, utilize vacuum tank intrasystem lunar soil cylinder locking mechanism connect and lock lunar soil cylinder;
J, containing vacuum can system, the vacuum tightness of each position in Real-Time Monitoring vacuum tank system, when having position in vacuum tank system for vacuum, makes vacuum pump group extract in vacuum tank system air-flow out until vacuum tank is vacuum environment.
Be provided with the inner bag that space 800 object stainless steel filtering net makes in described lunar soil cylinder, inner bag is close on lunar soil cylinder inwall and diapire.
What in described particle shape alkaliolivinebasalt, grain diameter was less than 0.01mm accounts for 13.51%, 11.99% is accounted between 0.01-0.025mm, 12.83% is accounted between 0.025-0.05mm, 8.24% is accounted between 0.05-0.075mm, between 0.075-0.1, account for 5.53%, between 0.1-0.25mm, account for 14.2%, between 0.25-0.5, account for 10.2%, between 0.5-1mm, account for 8.5%, what be greater than 1mm accounts for 15%.
The time that first described three-dimensional vibrating platform vibrates at above-below direction is 5 minutes, and the time that left and right, front and back, upper and lower three directions vibrate simultaneously is 15 minutes.
The frequency of described three-dimensional vibrating Platform Vibration is 30Hz.
The present invention's advantage is compared with prior art:
(1) the inventive method compared with prior art, prepared and mix and blend by simulative lunar soil grain composition, solve the problem that simulative lunar soil and actual lunar soil there are differences in size grading, achieve the high equivalent simulation of simulative lunar soil particle size distribution;
(2) the present invention compared with prior art, by the method adopting the bottom of simulative lunar soil to vacuumize, can ensure that simulative lunar soil relative loose does not occur, thus ensure simulative lunar soil high solidity feature;
(3) the present invention compared with prior art, lunar soil cylinder inwall and flange in the bottom placement is close to by the inner bag made by space 800 object stainless steel filtering net, ensure that lunar soil is not while particle leaks outside in compacting and drilling test process, achieves the inner vacuum of simulative lunar soil;
(4) the present invention compared with prior art, by using the dust filtering device in the multi-layer stainless mesh of lunar soil cylinder inwall and vacuum pump group, decreasing the pollution to vacuum pump group, substantially increasing the serviceable life of vacuum pump group.
Accompanying drawing explanation
Fig. 1 is the simulative lunar soil preparation method installation drawing in a kind of vacuum simulated environment of the present invention with high solidity feature;
Fig. 2 is simulative lunar soil three-dimensional vibrating debulking methods figure in the inventive method;
Fig. 3 is the simulative lunar soil vacuum environment implementation method figure in the inventive method with high solidity feature.
Embodiment
The present invention proposes the simulative lunar soil preparation method in a kind of vacuum simulated environment with high solidity feature, can under the environment of simulation lunar surface vacuum, the physico mechanical characteristic such as the superelevation packing of high equivalent Reality simulation lunar soil, large angle of friction, high cohesion, high dilatancy, therefore the ground experiment research of the present invention's various Sample acquisition activity under not only can being applied to lunar surface vacuum environment, but also can expansive approach in the preparation of other vacuum environment Imitating star earth.Below in conjunction with accompanying drawing, the inventive method is described in detail.
Lunar soil analogy method of the present invention is realized with vacuum analogue means by simulative lunar soil preparation, and simulative lunar soil preparation comprises vacuum tank system 1, vacuum pump group 2 with vacuum analogue means, controls and data acquisition system (DAS) 3, three-dimensional vibrating platform 4 as shown in Figure 1.
Vacuum tank system 1 realizes the vacuum environment of simulative lunar soil, and vacuum tank system 1 comprises vacuum tank, lunar soil cylinder, lunar soil cylinder locking mechanism.
Vacuum tank is the hollow tubular structure of external diameter Φ 640mm, internal diameter Φ 620mm, and material is structural steel, and be divided into vacuum tank epimere, vacuum tank hypomere, vacuum tank base, between three sections, bolt is fixedly connected with successively, and vacuum tank tank base is fixed on ground.Lunar soil cylinder is positioned at vacuum tank inside, is the hollow cylinder of external diameter Φ 500mm, internal diameter Φ 484mm, height overall 2m, material structure steel, lunar soil cylinder entirety is made up of the lunar soil cylinder flange in the bottom 102b of lunar soil cylinder 102a, is fixedly connected with vacuum tank bolt by flange in the bottom 102b.Lunar soil cylinder latch mechanism is arranged on lunar soil cylinder waist, is connected with vacuum tank, prevents lunar soil cylinder from rotating in drilling process and toppling over.Lunar soil cylinder comprises operating handle and support bar, and lunar soil cylinder helps mechanism to be essentially leverage, and spring is equipped with in support bar cylinder inside, spring compression support bar, adopts the seal with elastometic washer of O type between support bar cylinder and support bar.After handle is in compression, handle and vacuum tank outer wall snap close are fixed, and now lunar soil cylinder is fixed, can not left-right rotation.Lunar soil cylinder latch mechanism uniform three groups at lunar soil cylinder section.
The design of vacuum tank bleeding point, in bottom, is bled from the bottom of lunar soil cylinder, can be ensured that simulative lunar soil relative loose does not occur, thus ensures simulative lunar soil high solidity feature.The inner bag simultaneously adopting space 800 object stainless steel filtering net to make is close to lunar soil cylinder inwall and flange in the bottom is placed, adopt spot-welding technology to be welded on lunar soil cylinder inwall by stainless (steel) wire inner bag at bleeder vent place, both ensured that lunar soil particle in compacting and drilling test process did not leak outside, the gas being conducive to again simulative lunar soil inside is discharged.
Vacuum tank internal gas pressure is extracted into vacuum state by vacuum pump group 2, and vacuum pump group 2 comprises diffusion pump group, cooling water circulation machine, gas compressor, vacuum pipe, dust filtering device.
Control to control pump group with data acquisition system (DAS) 3, diverse location vacuum tightness in vacuum tank is measured, position lay respectively in the middle part of vacuum tank epimere, in the middle part of vacuum tank hypomere with vacuum pump group bleeding point 3 place, control in real time and the vacuum tightness distribution situation in monitoring vacuum tank.
Three-dimensional vibrating platform 4 carries out vibrating compacting, more than degree of depth 2m, 100% superelevation relative compaction can be obtained, and the physico mechanical characteristic such as large angle of friction, high cohesion, high dilatancy, guarantee and true lunar soil equivalence, and carry out complete section face simulative lunar soil nature examination, utilize quality volume on_line detection method to control in real time and detect the relative compaction that simulative lunar soil fills compacting, the quantification realizing physical and mechanical parameter is controlled.
First vacuum tank system 1 being dismantled, simulative lunar soil is carried out to lunar soil cylinder and fills, lunar soil cylinder is fastened on separately on three-dimensional vibrating platform 4, carrying out vibrating compacting by filling simulative lunar soil in three-dimensional vibrating platform 4 pairs of lunar soil cylinders.After prepared by simulative lunar soil, lunar soil cylinder is lifted in vacuum tank system 1, by controlling to vacuumize with 2 groups, data acquisition system (DAS) 3 pairs of vacuum pumps, diverse location vacuum tightness in vacuum tank is measured, real-time control and the vacuum tightness distribution situation in monitoring vacuum tank, until the vacuum environment of simulative lunar soil realizes.
Below in conjunction with embodiment, the inventive method is described in further detail.Be illustrated in figure 2 simulative lunar soil three-dimensional vibrating compacting implementation method figure in the present invention, be illustrated in figure 3 the simulative lunar soil vacuum environment implementation method figure with high solidity feature described in the embodiment of the present invention, specific implementation process is as follows:
(1) bolt is utilized to be fastened on three-dimensional vibrating platform 4 the lunar soil cylinder flange in the bottom 102b of lunar soil cylinder 102a;
(2) choose particle shape alkaliolivinebasalt as simulative lunar soil starting material and mix and blend, obtain simulative lunar soil, wherein, particle shape alkaliolivinebasalt comprises the alkaliolivinebasalt of angular, subangular;
(3) utilize mass body area method to measure simulative lunar soil relative density, record is carried out to the deep layer simulative lunar soil quality inputted each time, measure soil height in test flume after waiting to vibrate, control the high relative density of 100%.
(31) repeatedly quality m is taken jsimulative lunar soil be filled in lunar soil cylinder 102a, then by floating for simulative lunar soil surface, wherein, the initial value of j is 1, j=1,2,3 ... N, m jfor jth time takes and puts into the simulative lunar soil quality in lunar soil cylinder 102a;
(32) counterweight is placed on lunar soil cylinder 102a, covers lunar soil cylinder 102a mouth, in case dust pollution with dust-proof pocket;
(33) make three-dimensional vibrating platform 1 first in above-below direction vibration, then in left and right, front and back, upper and lower three directions vibrate simultaneously, the simulative lunar soil height h' after measuring vibrations j; Described h' jfor the height after interpolation jth time simulative lunar soil also vibration;
(34) according to the simulative lunar soil height h' after vibration jdensity p after the vibration of calculating simulation lunar soil dfor
ρ d = 4 m πD 2 h ′ j
Wherein, D is lunar soil cylinder 102a internal diameter;
If density p after simulative lunar soil vibration dreach the maximum dry density of simulative lunar soil, then stop vibration, otherwise continue to vibrate in X, Y, Z tri-directions simultaneously, until density p after simulative lunar soil vibration dreach the maximum dry density of simulative lunar soil;
(35) j=j+1, repeats step (31) ~ (34), until j=N, wherein, m alwaysfor required simulative lunar soil quality;
(36) mass body area method is utilized to measure simulative lunar soil relative compaction D rfor
Wherein, h alwaysfor simulative lunar soil overall height after N vibration, when the size grading ratio of more than 5mm in simulative lunar soil is not more than 6%, ρ ' dmax=ρ dmax, ρ ' dmin=ρ dmin, ρ dmaxfor simulative lunar soil maximum dry density, ρ dminfor simulative lunar soil experimental relationship, when the size grading ratio of more than 5mm in simulative lunar soil is greater than 6%,
If simulative lunar soil relative compaction D rbe greater than 100%, then prepare up to standard, obtain the simulative lunar soil of high solidity feature, otherwise preparation is not up to standard.
(4) lunar soil cylinder 102a hangs in vacuum tank system 1, utilizes lunar soil cylinder flange in the bottom 102b be connected with the lunar soil cylinder locking mechanism of vacuum tank system 1 and lock after having prepared by the simulative lunar soil with high solidity feature;
(5) closing vacuum tank system 1 hatch door, by controlling to start with data acquisition system (DAS) 3 pairs of pump groups, diverse location vacuum tightness in vacuum tank being measured, control in real time and the vacuum tightness distribution situation in monitoring vacuum tank;
(6) lunar soil cylinder inwall and flange in the bottom 102b have bleeder vent, when bleeding to vacuum tank system 1, can vacuumize simulative lunar soil inside simultaneously; The inner bag simultaneously adopting space 800 object stainless steel filtering net to make is close to lunar soil cylinder inwall and flange in the bottom is placed, adopt spot-welding technology to be welded on lunar soil cylinder inwall by stainless (steel) wire inner bag at bleeder vent place, both ensured that lunar soil particle in compacting and drilling test process did not leak outside, the gas being conducive to again simulative lunar soil inside is discharged, and improves the implementation efficiency of vacuum environment;
(7) air-flow is discharged from simulative lunar soil inside, by vacuum pipe 201 and the dust filtering device 203 of vacuum pump group 2, finally reaches diffusion pump 202, until the vacuum environment of simulative lunar soil realizes.
The simulative lunar soil preparation method in a kind of vacuum simulated environment of the present invention with high solidity feature is achieved by above-mentioned steps, significant to the Research And Engineering test of moon exploration.
The content be not described in detail in instructions of the present invention belongs to the known technology of those skilled in the art.

Claims (5)

1. there is in vacuum simulated environment the simulative lunar soil preparation method of high solidity feature, it is characterized in that comprising the steps:
A, lunar soil cylinder (102a) is vertically fastened on three-dimensional vibrating platform (4); The right cylinder that described lunar soil cylinder (102a) is inwall, diapire is provided with bleeder vent;
B, choose particle shape alkaliolivinebasalt as simulative lunar soil starting material and mix and blend, obtain simulative lunar soil, wherein, particle shape alkaliolivinebasalt comprises the alkaliolivinebasalt of angular, subangular;
C, take quality m nsimulative lunar soil be filled in lunar soil cylinder (102a), then by floating for simulative lunar soil surface, wherein, the initial value of n is 1, n=1,2,3 ... N, m nit is the simulative lunar soil quality taking for n-th time and put in lunar soil cylinder (102a);
D, counterweight is placed on lunar soil cylinder (102a), covers lunar soil cylinder (102a) mouth with dust-proof pocket;
E, make three-dimensional vibrating platform (4) first in above-below direction vibration, then in left and right, front and back, upper and lower three directions vibrate simultaneously, the simulative lunar soil height h' after measuring vibrations n; Described h' nfor adding n-th simulative lunar soil and height after vibration;
F, according to vibration after simulative lunar soil height h' ndensity p after the vibration of calculating simulation lunar soil dfor
ρ d = 4 Σ 1 n m n πD 2 h ′
Wherein, D is lunar soil cylinder (102a) internal diameter;
If density p after simulative lunar soil vibration dreach the maximum dry density of simulative lunar soil, then stop vibration, otherwise continue to vibrate in X, Y, Z tri-directions simultaneously, until density p after simulative lunar soil vibration dreach the maximum dry density of simulative lunar soil;
G, n=n+1, repeat step (c) ~ (f), until n=N, wherein, m alwaysfor required simulative lunar soil quality;
H, mass body area method is utilized to measure simulative lunar soil relative compaction D rfor
Wherein, h alwaysfor N time add simulative lunar soil and vibration after height, when the size grading ratio of more than 5mm in simulative lunar soil is not more than 6%, ρ ' dmax=ρ dmax, ρ ' dmin=ρ dmin, ρ dmaxfor simulative lunar soil maximum dry density, ρ dminfor simulative lunar soil experimental relationship, when the size grading ratio of more than 5mm in simulative lunar soil is greater than 6%,
ρ d m a x ′ = 1 1 - P 5 ρ d m a x + P 5 ρ 5
ρ d m i n ′ = 1 1 - P 5 ρ d m i n + P 5 ρ 5
If simulative lunar soil relative compaction D rbe greater than 100%, then prepare up to standard, obtain the simulative lunar soil of high solidity feature, otherwise preparation does not have up to standard, wherein, ρ 5for particle diameter in simulative lunar soil is the particle density of more than 5mm, P 5for the size grading ratio of more than 5mm in simulative lunar soil.
I, lunar soil cylinder (102a) to be hung in vacuum tank system (1), utilize the lunar soil cylinder locking mechanism in vacuum tank system (1) connect and lock lunar soil cylinder (102a);
J, containing vacuum can system (1), the vacuum tightness of Real-Time Monitoring vacuum tank system (1) interior each position, when having position not in vacuum tank system (1) for vacuum, vacuum pump group (2) is made to extract vacuum tank system (1) interior air-flow out until vacuum tank is vacuum environment.
2. there is in vacuum simulated environment according to claim 1 the simulative lunar soil preparation method of high solidity feature, it is characterized in that: be provided with the inner bag that space 800 object stainless steel filtering net makes in described lunar soil cylinder (102a), inner bag is close on lunar soil cylinder (102a) inwall and diapire.
3. there is in vacuum simulated environment according to claim 1 the simulative lunar soil preparation method of high solidity feature, it is characterized in that: what in described particle shape alkaliolivinebasalt, grain diameter was less than 0.01mm accounts for 13.51%, 11.99% is accounted between 0.01-0.025mm, 12.83% is accounted between 0.025-0.05mm, 8.24% is accounted between 0.05-0.075mm, 5.53% is accounted between 0.075-0.1, 14.2% is accounted between 0.1-0.25mm, 10.2% is accounted between 0.25-0.5, 8.5% is accounted between 0.5-1mm, what be greater than 1mm accounts for 15%.
4. there is in vacuum simulated environment according to claim 1 the simulative lunar soil preparation method of high solidity feature, it is characterized in that: the time that described three-dimensional vibrating platform (4) first vibrates at above-below direction is 5 minutes, and the time that left and right, front and back, upper and lower three directions vibrate simultaneously is 15 minutes.
5. there is in vacuum simulated environment according to claim 1 the simulative lunar soil preparation method of high solidity feature, it is characterized in that: the frequency that described three-dimensional vibrating platform (4) vibrates is 30Hz.
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CN106644566A (en) * 2016-12-01 2017-05-10 北京卫星制造厂 Unmanned independent self-adapting drilling method orienting complicated moon surface work conditions
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CN114323830A (en) * 2021-11-18 2022-04-12 北京卫星制造厂有限公司 Soil preparation device and method

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