CN107153742A - Regulate and control the method and technique of oxygen and gas concentration lwevel balance in airtight space cabin using Artificially transfering bezoar - Google Patents
Regulate and control the method and technique of oxygen and gas concentration lwevel balance in airtight space cabin using Artificially transfering bezoar Download PDFInfo
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- CN107153742A CN107153742A CN201710372347.2A CN201710372347A CN107153742A CN 107153742 A CN107153742 A CN 107153742A CN 201710372347 A CN201710372347 A CN 201710372347A CN 107153742 A CN107153742 A CN 107153742A
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- gas
- bezoar
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- cabin
- balance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G17/00—Cultivation of hops, vines, fruit trees, or like trees
- A01G17/005—Cultivation methods
Abstract
It the present invention relates to the use of O in Artificially transfering bezoar regulation and control airtight space cabin2And CO2The method and technique of concentration balance.Initially set up the Artificially transfering bezoar with bio-diversity；It is then determined that plant net photosynthesis speed and light intensity, CO2The mathematical modeling of relation between concentration；The materialization life support system feedback for again generally using in Artificially transfering bezoar and current spatial cabin couples, and constitutes closed-loop control system, gas balance feedback controller is designed using modern LQG methods, causes O when interior change and external disturbance occur in cabin2And CO2During deviation of concentration nominal level, by self-organizing effect and the light intensity feedback regulation of plant, change the Canopy Apparent Photosynthesis speed of Artificially transfering bezoar, the gas concentration in system is restored to nominal level, and with good dynamic response performance.This method and technique provide fresh vegetables and fruits for occupant and spirit are comforted while avoiding Redundancy Design energy-saving, improve the physically and mentally healthy level of occupant.
Description
Technical field
This technology patent of invention, which is related to one kind, to regard Artificially transfering bezoar as sensitive portion in airtight space cabin
Part, couples with physical chemistry regenerative life support (hereinafter referred to as materialization life is protected) feedback, to the gas in airtight space cabin
(O2And CO2) concentration balance regulated and controled.This method and technique can be widely applied to permanent space station, the moon, Mars, polar region, depth
Control is balanced to the robust of gas in the closed environment of the base such as sea, desert.
Background technology
Current Chinese Space station owner will use the CO that occupant produces in materialization life guarantor's technology, processing closed in space2With
The wastes such as urine, CO2Into Sa Shane Battier reactor, water is obtained after urine process, water enters back into apparatus for electrolyzing and produces O2With
H2, H2Sa Shane Battier reactor is entered back into, with CO2Progress is reacted and generates water.Therefore the waste that occupant produces is through physical chemistry formula
Circulation, is regenerated as O necessary to occupant2And water.It is (main that one of key technology of materialization life support system is just to maintain gas in cabin
It is CO2And O2) balance because in the case where gas is unbalance, can seriously threaten the health or even life security of occupant.Therefore
Allow gas to enough Basic Designs for steadily maintaining all the time in nominal level, being guarantee materialization life support system safety and reliability
Index.And interior change (such as occupant changes shifts) and external disturbance (such as thing are often subject to during materialization life support system is run
Stream input change) influence, gas concentration can usually deviate the nominal level of setting, and materialization life support system is often used at present
The method of Redundancy Design, that is, set up many set relevant apparatus and carry out same processing procedure, by physical chemistry means to gas balance
It is adjusted, its shortcoming is that complex operation, energy consumption are higher, and performance of control is easily influenceed by process disturbance.
Higher plant has, energy consumption high to envirment factor fast response time, metabolic plasticity low, easily controllable and Shandong
The features such as rod is strong, can quickly absorb CO2, discharge O2, the gas phase of rapid regulation surrounding environment is constituted, therefore they may make
It is combined for sensing unit with materialization life support system, it is strong as what is be controlled to the gas concentration balance in system cabin
Instrument.Each spacefaring nation in the current world (such as Russia, the U.S.) all enters to embedded higher plant unit in materialization life support system
Preliminary trial is gone, except on the basis of materializing procedure, increasing outside new bio-regeneration logistics peripheral passage, higher plant is also
Fresh veterinary antibiotics can be provided for occupant and psychological comforted.But there is presently no higher plant unit is used for into thing
Metaplasia insurance system gas robust balances the report of control aspect research.
In the materialization life support system of embedded Artificially transfering bezoar, the ecological factor of influence growth and development of plants is mainly light
Strong and CO2Concentration, they provide energy and raw material for photosynthesis.According to ecological principle, photosynthesis of plant speed and light
Strong and CO2S type changing rules, i.e., in light compensation point and light saturation point, CO is presented in concentration2Compensation point and CO2Between saturation point,
It is substantially linear between photosynthesis of plant speed and the two change., accordingly can be by implant according to cybernetics principle
Thing group couples with materialization life support system feedback, closed-loop control system is constituted, as O in system2And CO2When deviateing nominal level, lead to
The self-organizing effect and light intensity feedback regulation of plant are crossed, changes the Canopy Apparent Photosynthesis speed of Artificially transfering bezoar, makes in system
Gas concentration be restored to nominal level, and with good dynamic response performance --- preferable time delay, fluctuation
Number of times, maximum overshoot, stabilization time and steady-state error etc..Because Artificially transfering bezoar itself has powerful self-organizing stable
Property, and closed-loop control system structure is formed with control object, therefore, it is possible to effectively eliminate because of interior change and external disturbance pair
The adverse effect that gas concentration is balanced in cabin, makes gas concentration steadily balance in nominal level, is greatly enhancing materialization
While life support system runs safety and reliability, avoids Redundancy Design energy-saving, fresh vegetables and fruits and spirit are provided for occupant
Comfort, improve the physically and mentally healthy level of occupant.
The content of the invention
In the running of materialization life support system, due to being influenceed by interior change and external disturbance, the gas in cabin
Bulk concentration can often be offset from nominal level.Requirement according to the physicochemical characteristic of controlled device and to control performance, invention utilizes people
O in work phytobiocoenose regulation and control airtight space cabin2And CO2The method and technique of concentration balance, content include：
1. the Artificially transfering bezoar construction method based on bio-diversity
Bio-diversity has very great meaning to the function of maintaining biocoene and the ecosystem.It is basic herein
On, the experience and running experiment built according to early stage artificial ecological system is set up and put down suitable for materialization life support system gas concentration
Weigh the Artificially transfering bezoar construction method adjusted, selects those to illumination and CO2Competitive weaker leaf vegetables and fruit variety
Group is built, each species in group is fully occupied illumination and CO as far as possible2Do not have between the ecological niche of composition, sociales
Too many niche overlap, their Niche Differentiation, extension are also stronger with transfer ability.For example, when light intensity increases, certain
A little species reach light saturation point, it is impossible to which when further adjusting gas concentration, and other species can continue to undertake regulation
Effect；When light intensity is weaker, and some species photosynthesis decline, other species can but use CO2Compensatory light intensity is not
Foot, maintains higher photosynthetic rate.Artificially transfering bezoar with bio-diversity has powerful self organizing function, Neng Gouji
The earth weakens from internal system change and external disturbance to the adverse effect caused by gas balance.So that artificial plant group
Fall the Redundancy Design of substitute metaplasia insurance system, as gas balance key control unit.
2. the light intensity regulating method based on Liebig the least factor laws
In it embedded in the materialization life support system of Artificially transfering bezoar, light intensity and CO2All it is the minimum restriction factor of plant.
Therefore the net photosynthesis speed of plant can be expressed as：
In formula (1), P is the Net Photosynthetic Rate of plant, PmFor the maximum photosynthesis rate of plant, E is light intensity, and [] represents dense
Degree, KeAnd KcRepresent that Photosynthetic is strong and CO respectively2The semi-saturation constant of dependence, min represents to take minimum value.Therefore it is every kind of
Plant can be expressed as following ordinary differential system to gas rate of change influence in cabin：
In formula (2), α and R represent the production O of such a plant respectively2Coefficient and assimilation effect.Gas concentration change in whole cabin
Speed is equal to gas rate of change caused by plant net photosynthesis in Artificially transfering bezoar with respectively being reacted in materialization life support system
Gas rate of change sum caused by physical reaction in device.Can be to greatest extent using Liebig the least factors law regulation light intensity
Ground is acted on using the self-organizing of plant --- in CO2When concentration is higher, using relatively low light intensity, so as to save the energy, obtain most
Good control effect.
3. the STATE FEEDBACK CONTROL technique based on linear quadratic gaussian (LQG) method
On the basis of materialization life support system and Artificially transfering bezoar gas concentration dynamic mathematical models, using modern scientist
LQG methods design closed loop controller in theory, according to O2And CO2Real-time online concentration, feedback regulation light intensity makes O2And CO2's
Concentration is steadily maintained in nominal level.Some high frequency noises, LQG closed loops can be produced in the sampling process of gas sensor
Controller can effectively eliminate these noises to control action and the adverse effect of system operation, and digital integrator therein can
Effectively to eliminate steady-state error, make O in cabin2And CO2Concentration is maintained in the level consistent with nominal value.
When some state variables can not be surveyed in cabin, LQG methods can design a Kalman according to the state equation of system
Wave filter carrys out the state of forecasting system, it collectively form with optimum gain the input of servo controller track reference (gas it is nominal
Concentration), in O2And CO2Deviation of concentration nominal value and in the case of having input disturbance and sampling noise, can by LQG controllers
Light intensity is adjusted, gas concentration experience shorter time and less fluctuation is backed within nominal level state.
4th, the real-time simulation technique based on MatLab/Simulink
Materialization life, which is completed, with MatLab/Simulink real-time simulation instrument Real-Time Workshop (RTW) protects system
System and the real-time simulation technique of Artificially transfering bezoar gas closed-loop control system, i.e. structure of the hardware in the real system prototype in loop
Build.Wherein：Controller uses high performance industrial computer/single-chip microcomputer；Executing agency uses pulsewidth modulation (Pulse-width
Modulate, PWM) red blue light emitting diode (light-emitting diode, LED) power supply；Peripheral circuit includes：Number
According to collection plate (NI PCI 6221), O2And CO2Sensor, amplifying circuit etc.；Controlled device is the gas in materialization life support system
Concentration.The controller simulation model that industrial computer/single-chip microcomputer operation is built by MatLab/Simulink in real-time emulation system,
It receives the real-time online O in the cabin that sensor is obtained2And CO2Concentration data, through numerical computations, determines output intensity size, control
Actuator LED processed voltage, changes light intensity.
Brief description of the drawings
Fig. 1：Materialization life support system is fed back with Artificially transfering bezoar couples the gas closed-loop control system schematic block diagram constituted；
Fig. 2：The schematic block diagram of LQG feedback controllers composition；
Embodiment
First on the basis of the experiment of early stage artificial ecological system, suitable plant variety is screened, except paying close attention to photosynthetic spy
Outside property, also take into account its nutrition and qualitative characteristics, they constituted into the Artificially transfering bezoar with bio-diversity, using light intensity as
Adjustable envirment factor, gas sensitization unit is considered as by Artificially transfering bezoar, is coupled with materialization life support system feedback, is constituted gas
Body closed-loop control system.
Then on the basis of Related Mechanism and experimental data, with system dynamics and Chemical Measurement principle, set up
The production of materialization system unit and Artificially transfering bezoar/gas consumption kinetics equation, whole gas is constituted by the coupling of higher-dimension
The kinetic model of closed-loop control system.In addition to continuous process, model is also to known in system or that may be present do not connect
Continuous link (such as dead band, viscous, winding, saturation and time-varying) does careful simulation, ensures model with prototype in knot as much as possible
Structure and uniformity functionally.
Last fed back in materialization life support system with Artificially transfering bezoar couples the gas closed-loop control system mathematical modulo constituted
On the basis of type, with MatLab/Simulink, Matlab/RTW is development platform, is controlled system value emulation and real
When the exploitation and application that emulate.Control process is as follows：
As CO in cabin2And O2During deviation of concentration nominal level, gas sensor is and anti-information by measuring monitoring in real time
The analog-digital converter (A/D) of data acquisition board is fed to, into the simulation model of LQG controllers, the Kalman in LQG controllers
Those are unable to the state value of on-line measurement to filter prediction, and status predication value combines the optimal LQ controls gain of determination with integrator,
And the light intensity value for needing to export is calculated, the digital analog converter (D/A) of acquired plate is converted into virtual voltage control by amplifying circuit
Signal processed, controls LED intensity of illumination, so as to change the Canopy Apparent Photosynthetic Rate of Artificially transfering bezoar, causes O in cabin2With CO2's
Dynamic response occurs for concentration --- it is consistent with their nominal concentrations, and with good dynamic response performance：Mapping
With steady-state behaviour.
Claims (5)
1. regulate and control the method and technique of oxygen and gas concentration lwevel balance in airtight space cabin using Artificially transfering bezoar, its
It is characterised by：
(1) Artificially transfering bezoar with bio-diversity is set up, is embedded it in materialization life support system, replace superfluous in the past
Remaining design, is used for the robust control that gas concentration is balanced in airtight space cabin as sensing unit.It is real-time according to gas in cabin
Online concentration, feedback regulation light intensity, so as to influence the Net Photosynthetic Rate of Artificially transfering bezoar, makes gas in cabin steadily balance
In nominal level, and with good dynamic response performance.
(2) the regulation light intensity based on Liebig the least factor laws, can make full use of the self organization ability of Artificially transfering bezoar,
And CO2To the compensation of light intensity, enable Artificially transfering bezoar under relatively low light intensity, maintain higher Net photosynthesis rate, from
And greatly reduce the consumption of the energy, improve the safety and reliability of system operation.
(3) with linearity quadratic gauss method (LQG) design servo controller.It is anti-according to materialization life support system and Artificially transfering bezoar
Physical features, mathematical modeling and the sensor noise feature for the gas closed-loop control system that feedback connection is constituted, design Kalman filters
Ripple device eliminates noise to the adverse effect of control, and predict those can not on-line measurement state variable value, it is suitable to determine
Intensity control is exported.
(4) MatLab/Simulink is combined with MatLab/RTW platforms, completes materialization life support system and Artificially transfering bezoar
The real-time simulation of gas closed-loop control system, makes Artificially transfering bezoar turn into the actual gas robust balance control of materialization life support system
Device physical prototype processed, so as to reduce the Redundancy Design of materialization system, reduces energy consumption, strengthens security reliability, and provide for occupant
Fresh leaf vegetables, fruit and psychology are comforted.
2. method as claimed in claim 1, it is characterised in that：The Artificially transfering bezoar with bio-diversity is set up, it is embedding
Enter into materialization life support system, the robust control for space cabins indoor gas concentration balance.
3. method as claimed in claim 1, it is characterised in that：Based on the regulation light intensity of Liebig the least factor laws, make artificial
Phytobiocoenose can maintain higher Net photosynthesis rate under relatively low light intensity, so as to greatly reduce the consumption of the energy, improve system fortune
Capable safety and reliability.
4. method as claimed in claim 1, it is characterised in that：With linearity quadratic gauss method (LQG), servo controller is designed.
Design Kalman filter eliminate noise adverse effect, and predict those can not on-line measurement state variable value, with determine
Suitable intensity control output.
5. method as claimed in claim 1, it is characterised in that：Mutually tied with MatLab/Simulink and MatLab/RTW platforms
Close and complete real-time simulation, Artificially transfering bezoar is turned into the actual gas robust balance controller physics of materialization life support system former
Type, so as to reduce the Redundancy Design of materialization system, reduces energy consumption, strengthens security reliability, and provide fresh leaf vegetables, water for occupant
Fruit and psychology are comforted.
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| CN201710372347.2A CN107153742A (en) | 2017-05-24 | 2017-05-24 | Regulate and control the method and technique of oxygen and gas concentration lwevel balance in airtight space cabin using Artificially transfering bezoar |
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| CN201710372347.2A CN107153742A (en) | 2017-05-24 | 2017-05-24 | Regulate and control the method and technique of oxygen and gas concentration lwevel balance in airtight space cabin using Artificially transfering bezoar |
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Cited By (2)
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| CN110647196A (en) * | 2019-10-14 | 2020-01-03 | 全元通通讯股份有限公司 | Active indoor planting dynamic carbon dioxide concentration adjusting system |
| CN115443838A (en) * | 2022-10-11 | 2022-12-09 | 合肥创农生物科技有限公司 | Plant gas self-balancing system for indoor environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110647196A (en) * | 2019-10-14 | 2020-01-03 | 全元通通讯股份有限公司 | Active indoor planting dynamic carbon dioxide concentration adjusting system |
| CN115443838A (en) * | 2022-10-11 | 2022-12-09 | 合肥创农生物科技有限公司 | Plant gas self-balancing system for indoor environment |
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Application publication date: 20170912 |