Robust controller for adjusting equilibrium of gases in small artificial ecosystem

Abstract

The invention relates to development of a robust controller for adjusting concentration equilibrium of CO2 and O2 in a small closed artificial ecosystem. Firstly, the simulation model of the robust controller of the gases is established based on relevant mechanisms and properties of controlled objects, secondly, the feasibility of the structure and the parameters of the algorithmic model is preliminarily studied by the method of completely digital simulation and finally, the real-time simulation experiment is carried out to check the actual effect of the controller. The sensor can be calibrated with the measured value of the other sensor under the condition that one sensor fails to realize robust fault-tolerant control by designing monitoring logic of a finite-state machine and learning and predicting an artificial neural network. The controlled light intensity is computed by the linear quadratic Gaussian algorithm, thus effectively affecting the growth rate of the microalgae in the artificial ecosystem, directly achieving the aim of adjusting the concentration of CO2 and O2 and ensuring the concentration to be steadily balanced in the set range and have good dynamic response property.

Description

technical field [0001] The technical invention patent relates to the development of a controller capable of robustly adjusting the gas balance in a small artificial ecosystem in a closed environment. The controller can be widely used in permanent space stations, the moon, Mars, polar regions, deep seas, deserts, etc. The control of gas balance in the airtight environment of the base. Background technique [0002] "Bioregenerative life support system (BLSS)" is an artificial ecosystem, and it is a life support system that must be established and developed for manned spaceflight, deep space exploration and survival under extreme conditions in the future. One of the key technologies of the system is to keep the gas in the system (mainly CO 2 and O 2 ) balance, because in the case of gas imbalance, it will immediately threaten the life of occupants in the system and cause a catastrophic collapse of the system. Therefore, it is the basic design index to ensure the safety and r...

AI Technical Summary

Problems solved by technology

[0004] Judging from the current research status of various countries in the world, the research on the control methods of the life support system is still at a relatively single method level, and most of them still rely on specific experiments and combine the experience of researchers to carry out artificial open-loop control, which does not address this complex problem. The system forms a scientific and effective control algorithm for closed-loop automatic control

However, the defects of open-loop control are as follows: firstly, because the occupants in the BLSS are affected by working hours, living environment and emotions, etc., there will be operational errors; When certain parameters are precisely controlled, manual control cannot achieve good results; third, because the occupants are not designers of the BLSS, they lack understanding of the operating laws of the system, which will inevitably lead to operational errors; fourth, because the BLSS is a complex system, its The internal process changes are extremely complex, there are a large number of discontinuous, nonlinear and time-varying factors, and the operation is often adversely affected by external disturbances, which will present an unstable phenomenon

Images