A design method based on a controller for regulating gas balance in an artificial closed ecosystem

An ecosystem and controller technology, applied in the direction of various fluid ratio control, etc., can solve the problems of permanent irreversible damage of the system, gas deviation from the nominal level, collapse, etc.

Active Publication Date: 2016-08-17
BEIHANG UNIV
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Problems solved by technology

Under normal circumstances, the gas (O 2 and CO 2 ) balance is mainly maintained by the photosynthesis of higher plants and the respiration of animals (including humans). Gases tend to deviate from nominal levels
If the gas imbalance state lasts for too long, it will cause great harm to people and other living things, and may cause permanent irreversible damage to the system, or even collapse

Method used

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  • A design method based on a controller for regulating gas balance in an artificial closed ecosystem
  • A design method based on a controller for regulating gas balance in an artificial closed ecosystem

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Embodiment Construction

[0007] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0008] 1. Establishment of forward and reverse system models of photobioreactor and fermentation reactor based on system identification

[0009] On the MatLab / System Identification platform, according to the input-output time series, the system identification of the photobioreactor and the fermentation reactor was carried out, and their positive system models were obtained. They are respectively ① photobioreactor: light intensity-O production 2 Rate transfer function model and ②Fermentation reactor: temperature—CO production 2 Rate transfer function model. The delay link in the model is approximated as a transfer function by the Pade method. On the basis of the forward system model of photobioreactor and fermentation reactor, their inverse system model is solved, which is also the transfer function.

[0010] 2. Compen...

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Abstract

The invention relates to a controller for automatically regulating and controlling gas steady balance in an artificial closed ecological system, and mainly aims at problems of important process control in the space controlled ecological life support system in our country. Based on experiment data and system identification, positive system and reverse system models of a microalgae light bioreactor and aerobic microbial fermentation reactor are established. According to gas amount practically needed to be compensated, a response curve of oxygen or carbon dioxide production speed is established. Simulation models of the reverse system model and a gas production speed response curve algorithm are established on a MatLab / Simulink platform. A simulation model rapid prototype is designed into a practical controller by utilizing MatLab / Real-timeWorkshop. In the emergency state, the response curve of the oxygen and carbon dioxide production speed is confirmed via online monitoring of gas concentration in the system. The real-time control law of the light algae reactor and the fermentation reactor is obtained by utilizing the reverse system model so that gas concentration in the system is steadily balanced at the nominal level, and thus objectives of enhancing safety and reliability of the artificial closed ecological system are realized.

Description

technical field [0001] The invention relates to a gas (O 2 and CO 2 ) The automatic controller of concentration balance is mainly aimed at the process control and adjustment of the stable operation of the space-controlled ecological life support system. Background technique [0002] The current development of space science and technology has solved the problem of sending humans into space, but how to support people's long-term survival in space or alien bases for several months or even years has become a key problem that needs to be solved urgently in the field of space science and technology. The ultimate solution to this problem is to transplant the ecosystem on the ground into outer space, making it a controlled artificial closed ecosystem, providing long-term sustainable life support for the occupants by effectively regulating material circulation, energy flow and information transmission and protection. Under normal circumstances, the gas (O 2 and CO 2 ) balance is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D11/08
Inventor 刘红胡大伟谢倍珍付玉明李乐园张厚凯
Owner BEIHANG UNIV
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