CN116086852A - Design method of low gravity vacuum test system - Google Patents
Design method of low gravity vacuum test system Download PDFInfo
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- CN116086852A CN116086852A CN202310363021.9A CN202310363021A CN116086852A CN 116086852 A CN116086852 A CN 116086852A CN 202310363021 A CN202310363021 A CN 202310363021A CN 116086852 A CN116086852 A CN 116086852A
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Abstract
The application discloses a design method of low gravity vacuum test system belongs to scientific test instrument field, and its technical essential lies in: wherein, the low gravity vacuum test system comprises: the vacuum pump unit, the vacuum box body and the test materials are arranged in the vacuum box body, wherein 2 jet power mechanisms are arranged in the vacuum box body; the 2 jet power mechanisms and the test materials are all arranged in the vacuum box body; the action time of the 2 jet power mechanisms is disjoint; v (V) Net for cleaning The values of (2) are as follows: when L 1 P Spray 1 ≤L 2 P Spray 2 V at the time of Net for cleaning =[L 1 P Spray 1 t 1min +L 2 P Spray 2 （t u ‑t 1min ）]/（P Limiting ‑P 0 ) The method comprises the steps of carrying out a first treatment on the surface of the When L 1 P Spray 1 ＞L 2 P Spray 2 V at the time of Net for cleaning =[L 1 P Spray 1 （t u ‑t 2min ）+L 2 P Spray 2 t 2min ]/（P Limiting ‑P 0 ). The application aims to provide a design method of a low gravity vacuum test system, which improves the universality of the vacuum system.
Description
Technical Field
The invention relates to the field of scientific test instruments, in particular to a design method of a low gravity vacuum test system.
Background
Patent application CN114062146A filed by Jilin university and Beijing spacecraft general design department in combination provides a low gravity experimental simulation method and device. The core idea is as follows: the dead weight of the test material is counteracted by the buoyancy of the gas, so that the test of the material under the condition of low gravity is realized.
However, it is realistic that low gravity tends to occur with a vacuum environment. Therefore, the scientific test device only meets the requirement of low gravity, but cannot meet the requirement of vacuum environment. The difficulty with the above-described problems is that CN114062146a relies on the buoyancy of the gas to achieve zero gravity, while the vacuum environment requires no gas, so the principles of the two are contradictory.
Along with the development of scientific experiments, the following requirements are set for scientific instruments: the interaction of the jet power mechanism in a vacuum environment, low gravity or zero gravity is to be studied;
it faces the following technical needs:
A. the material is required to realize low gravity or zero gravity;
B. the power mechanism adopts jet propulsion;
C. the power train jet propulsion is also within a vacuum environment.
The technical development requirements are also problematic, and the power mechanism and the materials are in a low gravity or zero gravity vacuum environment, so that contradiction exists: the power mechanism needs to jet propulsion, and the ejected gas can damage the vacuum environment where the power mechanism and the materials are located; this creates a conflict.
In addition, for vacuum test systems, the main problem of concern is:
first, the vacuum test system is also overall sized.
Second, the vacuum pump group is selected. For the design of the vacuum pump set, the main parameters are as follows: the vacuum vessel volume, pump set pumping rate (determined by the vacuum pump set), initial pressure, target pressure, pumping time. The initial pressure, as well as the target pressure and the pump down time, are known, and therefore, to determine the pump set pumping rate (i.e., to determine the pump set composition), the volume of the vacuum test system must also be known.
Therefore, how to design a vacuum test system meeting the technical requirements is not reported in the related literature, and related reference materials are lacking.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a design method of a low gravity vacuum test system.
The technical scheme of the invention is as follows:
a design method of a low gravity vacuum test system for researching interaction of a jet power mechanism in a vacuum environment, low gravity or zero gravity;
the low gravity vacuum test system comprises: the vacuum pump unit, the vacuum box body and the N jet power mechanisms are arranged in the vacuum box body, and are made of materials for test;
the N jet power mechanisms and the test materials are all arranged in the vacuum box body;
the vacuum pump unit pretreats the vacuum box body;
the test procedure was as follows:
s1, placing a material for test into the vacuum box;
s2, the vacuum pump unit firstly pretreats the vacuum box body, and adjusts the gas in the vacuum box body to the initial environmental background pressure P 0 ；
S3, closing the vacuum pump unit;
s4, testing: realizing a low gravity environment by adopting a parabolic method, wherein the environment continuously lasts for 0 th to t u Second, at the same time, N jet power mechanisms are arranged between 0 and t u Performing air injection, performing related action with the test material, and performing a test;
for the low gravity vacuum test system:
the known amounts are: initial ambient background air pressure P 0 Maximum duration t of single sustainable test process u Second, 1 st to N th jet power mechanism jet flow L 1 ～L N The method comprises the steps of carrying out a first treatment on the surface of the Original pressure P of gas of No. 1-N jet power mechanism Spray 1 ～P Spray N ；
The volume of equipment and test materials in the vacuum box is V Occupying the area of ；
The unknowns are: the determination of the total volume V in the vacuum box comprises the following 2 steps:
s1, determining the net volume V in the vacuum box Net for cleaning :
At t u Air injection time t of 1 st to N th air injection power mechanism in time period 1 ～t N The method comprises the steps of carrying out a first treatment on the surface of the The ambient background air pressure P after the air injection process is completed is:
P=[P 0 +（L 1 t 1 P spray 1 + L 2 t 2 P Spray 2 +……+L N t N P Spray N ）/V Net for cleaning ]
V Net for cleaning The value of (c) is such that P satisfies:
P≤P limiting
P Limiting Is an environmental background air pressure threshold value, and the value of the environmental background air pressure threshold value is below 180pa through experiments;
s2, determining the total volume V in the vacuum box:
V=V net for cleaning +V Occupying the area of 。
A method of designing a low gravity vacuum test system, wherein the low gravity vacuum test system comprises: the vacuum pump unit, the vacuum box body and the vacuum box body are internally provided with 2 jet power mechanisms and test materials; the 2 jet power mechanisms and the test materials are all arranged in the vacuum box body; the vacuum pump unit pretreats the vacuum box body;
the test procedure was as follows:
s1, placing a material for test into the vacuum box;
s2, the vacuum pump unit firstly pretreats the vacuum box body, and adjusts the gas in the vacuum box body to the initial environmental background pressure P 0 ；
S3, closing the vacuum pump unit;
s4, testing: realizing a low gravity environment by adopting a parabolic method, wherein the environment continuously lasts for 0 th to t u Second, at the same time, 2 jet power mechanisms are arranged between 0 and t u In the middle, jet air is injected into the test materialPerforming a test by performing a correlation function;
for the low gravity vacuum test system:
the known amounts are: initial ambient background air pressure P 0 Maximum duration t of single sustainable test process u Second, 1 st to 2 nd jet power mechanism jet flow L 1 ～L 2 The method comprises the steps of carrying out a first treatment on the surface of the Original pressure P of gas of 1 st to 2 nd jet power mechanism Spray 1 ～P Spray 2 ；t 1min The minimum test duration of the jet of the 1 st jet power mechanism is shown; t is t 2min The minimum test duration of the jet of the 2 nd jet power mechanism is shown;
the volume of equipment and test materials in the vacuum box is V Occupying the area of ；
The unknowns are: the total volume V in the vacuum box;
the determination of V includes the following 2 steps:
s1, determining the net volume V in the vacuum box Net for cleaning The value of the product meets the following four conditions:
condition 1: at t u Jet time t of 1 st jet power mechanism in time period 1 A jet minimum test duration t not less than the 1 st jet power mechanism 1min ：t 1 ≥t 1min ；
Condition 2: at t u Jet time t of the 2 nd jet power mechanism in time period 2 A jet minimum test duration t not less than the 2 nd jet power mechanism 2min ：t 2 ≥t 2min ；
Condition 3: the action time of the two jet power mechanisms is disjoint: t is t 1 +t 2 ≤t u
Condition 4: [ P ] 0 +（L 1 P Spray 1 t 1 + L 2 P Spray 2 t 2 ）/V Net for cleaning ]≤P Limiting
Accordingly, V Net for cleaning The value is as follows:
when L 1 P Spray 1 ≤L 2 P Spray 2 V at the time of Net for cleaning =[L 1 P Spray 1 t 1min + L 2 P Spray 2 （t u -t 1min ）]/ （P Limiting - P 0 ）；
When L 1 P Spray 1 ＞L 2 P Spray 2 V at the time of Net for cleaning =[ L 1 P Spray 1 （t u -t 2min ）+L 2 P Spray 2 t 2min ]/ （P Limiting - P 0 ）；
Wherein P is Limiting Representing an ambient background air pressure threshold;
s2, determining the total volume V in the vacuum box:
V=V net for cleaning +V Occupying the area of 。
Further, P Limiting The value is 130pa.
Further, P 0 The value is 5pa-15pa.
Further, the low gravity vacuum test system further comprises: the vacuum degree sensor is used for measuring the air pressure in the vacuum box body (which is matched with the step S2 and used for measuring whether the air in the vacuum box body is regulated to the initial environmental background air pressure or not; the vacuum degree sensor has little significance in the test process, because the test process time is short, the air pressure change is quick, and the measurement cannot react in real time).
The beneficial effects of this application lie in:
first, the scientific instrument developed in this application is designed to study the interaction of a jet power mechanism in a vacuum environment, low gravity or zero gravity.
The research and development difficulty is as follows: when the jet power mechanism interacts with the material, the gas ejected by the jet power mechanism can cause the vacuum environment to break the vacuum. Thus, the contradiction between the test subject and the test environment is not reconciled. That is, the design of the entire environmental system described above is currently unproductive.
Second, the first invention point of the present application is that: the concept of an ambient background air pressure and an ambient background air pressure threshold is presented. I.e., the ambient background air pressure is less than the ambient background air pressure threshold, the test is satisfactory.
In this concept, the present application proposes a general design approach:
[P 0 +（L 1 t 1 P spray 1 + L 2 t 2 P Spray 2 +……+L N t N P Spray N ）/V Net for cleaning ] ≤P Limiting 。
This is V Net for cleaning The basic principle of the determination.
Third, the second invention point of the present application is that, in the aforementioned general method, the design method for the low gravity vacuum test system based on the two processes is further optimized. The purpose of the vacuum system design is to be able to include more t 1 、t 2 Measurement scheme to improve the versatility of the vacuum system.
From this, based on the analysis of the two-dimensional coordinate system, V is derived Net for cleaning Is the optimal solution of (a):
when L 1 P Spray 1 ≤L 2 P Spray 2 V at the time of Net optimum =[L 1 P Spray 1 t 1min + L 2 P Spray 2 （t u -t 1min ）]/ （P Limiting - P 0 ）；
When L 1 P Spray 1 ＞L 2 P Spray 2 V at the time of Net optimum =[ L 1 P Spray 1 （t u -t 2min ）+L 2 P Spray 2 t 2min ]/ （P Limiting - P 0 ）；
Namely "when V Net for cleaning ＞V Net optimum Is a waste of space (parabolic method, vacuum box is placed on the plane, and the space on the plane is very tight); while when V Net for cleaning ＜V Net optimum Is a waste of time to achieve low or zero gravity for parabolic methods.
Thus V Net for cleaning Is a key parameter of the vacuum system of the present application.
And then confirm V Net for cleaning Thereafter, by: v=v Net for cleaning +V Occupying the area of The total volume V within the vacuum box can be determined. And then, the composition of the vacuum pump unit is determined through a vacuum pump working manual, and the overall design work of the vacuum system is completed.
Drawings
The invention is described in further detail below in connection with the embodiments in the drawings, but is not to be construed as limiting the invention in any way.
FIG. 1 is a schematic three-dimensional design of a low gravity vacuum test system according to the first embodiment.
Fig. 2 is a schematic diagram of the first, second, third, and fourth conditions of the second embodiment in a two-dimensional coordinate system.
Fig. 3 is a schematic diagram of the condition one, the condition two, the condition three, the condition four of the embodiment two in the two-dimensional coordinate system in the first case.
FIG. 4 is a schematic diagram of the second embodiment under the two-dimensional coordinate system of the first, second, third and fourth conditions (L 1 P Spray 1 <L 2 P Spray 2 ）。
FIG. 5 is a schematic diagram of the second embodiment under the two-dimensional coordinate system of the first, second, third and fourth conditions (L 1 P Spray 1 >L 2 P Spray 2 ）。
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
< example one: design method of low gravity vacuum test system
< development requirement detailed description >
The scientific instrument developed in this application is designed to study the interaction of jet power mechanisms in vacuum environments, low gravity or zero gravity.
A. The material and the jet power mechanism are integrally realized under the condition of low gravity or zero gravity; this requirement is fulfilled by parabolic flight.
B. The power mechanism needs to adopt jet propulsion, and the mechanism cannot be replaced because the mechanism corresponds to the power mechanism in a deep space environment.
C. The jet propulsion of the power mechanism is also carried out in a vacuum environment which cannot be replaced, and the deep space environment belongs to the vacuum environment.
< analysis of difficulty in development >
With the above intensive analysis of research requirements, the gas emitted by the jet power mechanism can cause the vacuum environment to break vacuum when the jet power mechanism interacts with the material. Thus, the contradiction between the test subject and the test environment is not reconciled. That is, the design of the entire environmental system described above is currently unproductive.
< development idea >
The initial development thinking is: the jet port of the jet power mechanism is in a first independent environment, the end part of the power mechanism (which interacts with the material) and the material are in a second independent environment, so that the contradiction between the test object and the test environment is reconciled.
However, this method cannot be realized. The reason is that the motion trail of the air jet and the power mechanism is not fixed; meanwhile, the design of the jet power mechanism cannot be changed, otherwise, the experimental significance is lost. Based on both factors, the above concepts are essentially inexact.
< development idea two >
The breakthrough in the research and development process is as follows: the design of a test environment where the air nozzle and the materials are the same is accepted; the research and development team has proposed concepts that suggest ambient background air pressure and based thereon a set of design methods.
A design method of a low gravity vacuum test system for researching interaction of a jet power mechanism in a vacuum environment, low gravity or zero gravity;
as shown in fig. 1, the low gravity vacuum test system includes: the vacuum pump unit, the vacuum box body and the N jet power mechanisms are arranged in the vacuum box body, and are made of materials for test;
the N jet power mechanisms and the test materials are all arranged in the vacuum box body;
the vacuum pump unit pretreats the vacuum box body;
the test procedure was as follows:
s1, placing a material for test into the vacuum box;
s2, the vacuum pump unit firstly pretreats the vacuum box body, and adjusts the gas in the vacuum box body to the initial environmental background pressure P 0 ；
S3, closing the vacuum pump unit;
s4, testing: realizing a low gravity environment by adopting a parabolic method, wherein the environment continuously lasts for 0 th to t u Second, at the same time, N jet power mechanisms are arranged between 0 and t u Performing air injection, performing related action with the test material, and performing a test;
for the low gravity vacuum test system:
the known amounts are: initial ambient background air pressure P 0 Maximum duration t of single sustainable test process u Second, 1 st to N th jet power mechanism jet flow L 1 ～L N The method comprises the steps of carrying out a first treatment on the surface of the Original pressure P of gas of No. 1-N jet power mechanism Spray 1 ～P Spray N ；
The unknowns are:
the net volume in the vacuum box is V Net for cleaning At t u Air injection time t of 1 st to N th air injection power mechanism in time period 1 ～t N The method comprises the steps of carrying out a first treatment on the surface of the The ambient background air pressure P after this process is completed is:
P=[P 0 +（L 1 t 1 P spray 1 + L 2 t 2 P Spray 2 +……+L N t N P Spray N ）/V Net for cleaning ]
The total volume V in the vacuum box, the equipment and the test material volume in the vacuum box are V Occupying the area of ，V Net for cleaning Namely V-V Occupying the area of 。
P is as follows:
P≤P limiting
P Limiting Is an environmental background air pressure threshold value, and the value of the environmental background air pressure threshold value is below 180pa through experiments.
The above formula shows that t 1 ～t N The more the time distribution of (a) is, the more schemes are available for testingThe more, according to the above formula, in this case also V is required Net for cleaning The smaller the corresponding P is, the better the test conditions are. And V is Net for cleaning And cannot be infinitely large (the vacuum box is placed in the aircraft and cannot be too large).
Thus, from the above analysis, it can be known that: t is t 1 ～t N 、V、V Occupying the area of The relation of (2) is as follows:
[P 0 +（L 1 t 1 P spray 1 + L 2 t 2 P Spray 2 +……+L N t N P Spray N ）/（V-V Occupying the area of ）]≤P Limiting
The above formula can be obtained:
V net for cleaning Is the minimum value V of (2) Clean min ≥（L 1 t 1 P Spray 1 + L 2 t 2 P Spray 2 +……+L N t N P Spray N ）/(P Limiting - P 0 ) 。
Based on the theory, the design method of the low gravity vacuum test system is provided, and the test environment requirement can be met.
< example two: design method of low gravity vacuum test system based on double working procedures
For the test system, the first embodiment gives a general design idea.
The second embodiment aims to study a more specific design concept. For the test conditions, the number of jet power units was 2, and the action times of both were disjoint (i.e. the 1 st jet power unit was moving, the 2 nd jet power unit 2 was not moving, and vice versa).
The selection range of the test scheme of the 1 st jet power mechanism and the 2 nd jet power mechanism 2, namely t 1 、t 2 The selection range of (2) is as follows:
condition 1: t is t 1 ≥t 1min （t 1 Representing t u The air injection time of the 1 st air injection power mechanism in the time period, t 1min Minimum air injection test for 1 st air injection power mechanismDuration of the test
Condition 2: t is t 2 ≥t 2min （t 2 Representing t u The air injection time of the 2 nd air injection power mechanism in the time period, t 2min Representing the minimum test duration of the jet of the 2 nd jet power mechanism
Condition 3: t is t 1 +t 2 ≤t u (the actuation times of the two jet-powered mechanisms are disjoint)
Condition 4: [ P ] 0 +（L 1 P Spray 1 t 1 + L 2 P Spray 2 t 2 ）/V Net for cleaning ]≤P Limiting
Let the function q=l 1 P Spray 1 t 1 + L 2 P Spray 2 t 2 =（P Limiting - P 0 ）V Net for cleaning The method comprises the steps of carrying out a first treatment on the surface of the T is as described above 1 、t 2 The selection range of (2) can be represented by a two-dimensional coordinate system, namely, in fig. 2: the conditions 1, 2, 3, and 4 are patterns (black filled regions) surrounded by four straight lines.
In essence, it can be seen from FIG. 1 that V can be clarified Net for cleaning Is a range of values.
First case: at V Net for cleaning <[L 1 P Spray 1 t 1min + L 2 P Spray 2 t 2min ]/ （P Limiting - P 0 ) In this case, as shown in fig. 3, the conditions 1, 2, 3, and 4 cannot be defined as areas, and the test cannot be performed.
Second case:
as shown in FIG. 4, when L 1 P Spray 1 < L 2 P Spray 2 When Q is greater than or equal to L 1 P Spray 1 t 1min + L 2 P Spray 2 （t u -t 1min ) The area surrounded by the conditions 1, 2, 3, and 4 is a triangle area.
I.e. V Net for cleaning >[L 1 P Spray 1 t 1min + L 2 P Spray 2 （t u -t 1min ）]/ （P Limiting - P 0 ) Is of no significance.
I.e. V Net for cleaning =[L 1 P Spray 1 t 1min + L 2 P Spray 2 （t u -t 1min ）]/ （P Limiting - P 0 ) Suitably.
As shown in FIG. 5, when L 1 P Spray 1 > L 2 P Spray 2 When Q is greater than or equal to L 1 P Spray 1 （t u -t 2min ）+L 2 P Spray 2 t 2min The area surrounded by the conditions 1, 2, 3, and 4 is a triangle area.
I.e. V Net for cleaning >[ L 1 P Spray 1 （t u -t 2min ）+L 2 P Spray 2 t 2min ]/ （P Limiting - P 0 ) Is of no significance.
I.e. V Net for cleaning =[ L 1 P Spray 1 （t u -t 2min ）+L 2 P Spray 2 t 2min ]/ （P Limiting - P 0 ) Suitably.
The physical significance of the above analysis is:
"when V Net for cleaning ＞V Net optimum Is a waste of space. That is, the selection range of the test protocol is not always dependent on V Net for cleaning Is increased by the increase of V Net for cleaning Greater than V Net optimum After that, the selection range of the test scheme is not improved any more;
while when V Net for cleaning ＜V Net optimum Is a waste of time to achieve low or zero gravity for parabolic methods.
And then confirm V Net for cleaning Thereafter, by: v=v Net for cleaning +V Occupying the area of The total volume V within the vacuum box can be determined. And then, the constitution of the vacuum pump unit is determined through a vacuum pump working manual, and the whole design work of the vacuum system is completed, and the process is as follows:
T air extraction =K（V/S）log（P Atmospheric air /P 0 ）；
K represents a correction coefficient, and 1.25-1.67 is taken; t (T) Air extraction To be pumped from atmospheric pressure to P 0 Time, P of (2) Atmospheric air Represents atmospheric pressure, P 0 Representing an initial ambient background pressure; v represents the total volume within the vacuum box (where V is used instead of V in pumping Net for cleaning Suitably, the calculation results are more conservative); s denotes the effective pumping speed.
The overall flight time of the aircraft is fixed due to its fuel limitation during a single flight, T for increasing the number of trials Air extraction Necessarily the smaller the better. Thus T Air extraction Less than or equal to the upper limit value T of air extraction Air extraction limit 。
From this, it can be determined that the design range of S:
S≥K（V/T air extraction limit ）log（P Atmospheric air /P 0 ) The method comprises the steps of carrying out a first treatment on the surface of the The selection of a specific vacuum pump set can be determined according to the range of S.
The above examples are provided for convenience of description of the present invention and are not to be construed as limiting the invention in any way, and any person skilled in the art will make partial changes or modifications to the invention by using the disclosed technical content without departing from the technical features of the invention.
Claims (6)
1. The design method of the low gravity vacuum test system is characterized in that the low gravity vacuum test system is used for researching interaction of a jet power mechanism in a vacuum environment, low gravity or zero gravity;
the low gravity vacuum test system comprises: the vacuum pump unit, the vacuum box body and the N jet power mechanisms are arranged in the vacuum box body, and are made of materials for test;
the N jet power mechanisms and the test materials are all arranged in the vacuum box body;
the vacuum pump unit pretreats the vacuum box body;
the test procedure was as follows:
s1, placing a material for test into the vacuum box;
s2, the vacuum pump unit firstly pretreats the vacuum box body, and adjusts the gas in the vacuum box body to the initial environmental background pressure P 0 ；
S3, closing the vacuum pump unit;
s4, testing: realizing a low gravity environment by adopting a parabolic method, wherein the environment continuously lasts for 0 th to t u Second, at the same time, N jet power mechanisms are arranged between 0 and t u Performing air injection, performing related action with the test material, and performing a test;
for the low gravity vacuum test system:
the known amounts are: initial ambient background air pressure P 0 Maximum duration t of single sustainable test process u Second, 1 st to N th jet power mechanism jet flow L 1 ～L N The method comprises the steps of carrying out a first treatment on the surface of the Original pressure P of gas of No. 1-N jet power mechanism Spray 1 ～P Spray N ；
The volume of equipment and test materials in the vacuum box is V Occupying the area of ；
The unknowns are: the determination of the total volume V in the vacuum box comprises the following 2 steps:
s1, determining the net volume V in the vacuum box Net for cleaning :
At t u Air injection time t of 1 st to N th air injection power mechanism in time period 1 ～t N The method comprises the steps of carrying out a first treatment on the surface of the The ambient background air pressure P after the air injection process is completed is:
P=[P 0 +（L 1 t 1 P spray 1 + L 2 t 2 P Spray 2 +……+L N t N P Spray N ）/V Net for cleaning ]
V Net for cleaning The value of (c) is such that P satisfies:
P≤P limiting
P Limiting Is an ambient background air pressure threshold;
s2, determining the total volume V in the vacuum box:
V=V net for cleaning +V Occupying the area of 。
2. A method of designing a low gravity vacuum test system, the low gravity vacuum test system comprising: the vacuum pump unit, the vacuum box body and the vacuum box body are internally provided with 2 jet power mechanisms and test materials; the 2 jet power mechanisms and the test materials are all arranged in the vacuum box body; the vacuum pump unit pretreats the vacuum box body;
the test procedure was as follows:
s1, placing a material for test into the vacuum box;
s2, the vacuum pump unit firstly pretreats the vacuum box body, and adjusts the gas in the vacuum box body to the initial environmental background pressure P 0 ；
S3, closing the vacuum pump unit;
s4, testing: realizing a low gravity environment by adopting a parabolic method, wherein the environment continuously lasts for 0 th to t u Second, at the same time, 2 jet power mechanisms are arranged between 0 and t u Performing air injection, performing related action with the test material, and performing a test;
for the low gravity vacuum test system:
the known amounts are: initial ambient background air pressure P 0 Maximum duration t of single sustainable test process u Second, 1 st to 2 nd jet power mechanism jet flow L 1 ～L 2 The method comprises the steps of carrying out a first treatment on the surface of the Original pressure P of gas of 1 st to 2 nd jet power mechanism Spray 1 ～P Spray 2 ；t 1min The minimum test duration of the jet of the 1 st jet power mechanism is shown; t is t 2min The minimum test duration of the jet of the 2 nd jet power mechanism is shown;
the volume of equipment and test materials in the vacuum box is V Occupying the area of ；
The unknowns are: the total volume V in the vacuum box;
the determination of V includes the following 2 steps:
s1, determining the net volume V in the vacuum box Net for cleaning The value of the product meets the following four conditions:
condition 1: at t u Spraying of the 1 st jet power mechanism in a time periodTime of air t 1 A jet minimum test duration t not less than the 1 st jet power mechanism 1min ：t 1 ≥t 1min ；
Condition 2: at t u Jet time t of the 2 nd jet power mechanism in time period 2 A jet minimum test duration t not less than the 2 nd jet power mechanism 2min ：t 2 ≥t 2min ；
Condition 3: the action time of the two jet power mechanisms is disjoint: t is t 1 +t 2 ≤t u
Condition 4: [ P ] 0 +（L 1 P Spray 1 t 1 + L 2 P Spray 2 t 2 ）/V Net for cleaning ]≤P Limiting
Accordingly, V Net for cleaning The value is as follows:
when L 1 P Spray 1 ≤L 2 P Spray 2 V at the time of Net for cleaning =[L 1 P Spray 1 t 1min + L 2 P Spray 2 （t u -t 1min ）]/ （P Limiting - P 0 ）；
When L 1 P Spray 1 ＞L 2 P Spray 2 V at the time of Net for cleaning =[ L 1 P Spray 1 （t u -t 2min ）+L 2 P Spray 2 t 2min ]/ （P Limiting - P 0 ）；
Wherein P is Limiting Representing an ambient background air pressure threshold;
s2, determining the total volume V in the vacuum box:
V=V net for cleaning +V Occupying the area of 。
3. The method for designing a low gravity vacuum test system according to claim 1 or 2, wherein P Limiting The value is below 180 pa.
4. A method of designing a low gravity vacuum test system according to claim 3, wherein P Limiting The value is 130pa.
5. A method of designing a low gravity vacuum test system according to claim 3, wherein P 0 The value is 5pa-15pa.
6. A method of designing a low gravity vacuum test system according to claim 3, wherein said low gravity vacuum test system further comprises: and the vacuum degree sensor is used for measuring the air pressure in the vacuum box body.
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| CN102610543A (en) * | 2012-01-18 | 2012-07-25 | 清华大学 | Variable-structure vacuum chamber for interior rarefied gas flow simulation verification and pressure detection |
| DE102012019713A1 (en) * | 2012-10-08 | 2014-04-10 | Davydov Lev | Plant for transformation of energy of atmospheric pressure into other energy forms using gravitational forces and Archimedean forces, has heavy cylinders and vacuum pump that generate vacuum in system for setting atmospheric pressure energy |
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| CN114062146A (en) * | 2021-11-04 | 2022-02-18 | 吉林大学 | Method and device for simulating low-gravity test of star soil |
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| CN102610543A (en) * | 2012-01-18 | 2012-07-25 | 清华大学 | Variable-structure vacuum chamber for interior rarefied gas flow simulation verification and pressure detection |
| DE102012019713A1 (en) * | 2012-10-08 | 2014-04-10 | Davydov Lev | Plant for transformation of energy of atmospheric pressure into other energy forms using gravitational forces and Archimedean forces, has heavy cylinders and vacuum pump that generate vacuum in system for setting atmospheric pressure energy |
| CN107748274A (en) * | 2017-09-30 | 2018-03-02 | 中国船舶重工集团公司第七0七研究所 | The method detected by servo circuit frequency sweep to accelerometer internal vacuum |
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