Model of Human/Liquid Cooling Garment Interaction for Space Suit Automatic Thermal Control

2000 ◽  
Vol 123 (1) ◽  
pp. 114-120 ◽  
Author(s):  
Karen L. Nyberg ◽  
Kenneth R. Diller ◽  
Eugene H. Wissler
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Thermal Comfort ◽  
Control Algorithm ◽  
Thermal Control ◽  
Metabolic Profiles ◽  
Space Suit ◽  
Liquid Cooling ◽  
The Subject ◽  
Cooling Garment

The Wissler human thermoregulation model was augmented to incorporate simulation of a space suit thermal control system that includes interaction with a liquid cooled garment (LCG) and ventilation gas flow through the suit. The model was utilized in the design process of an automatic controller intended to maintain thermal neutrality of an exercising subject wearing a liquid cooling garment. An experimental apparatus was designed and built to test the efficacy of specific physiological state measurements to provide feedback data for input to the automatic control algorithm. Control of the coolant inlet temperature to the LCG was based on evaluation of transient physiological parameters that describe the thermal state of the subject, including metabolic rate, skin temperatures, and core temperature. Experimental evaluation of the control algorithm function was accomplished in an environmental chamber under conditions that simulated the thermal environment of a space suit and transient metabolic work loads typical of astronaut extravehicular activity (EVA). The model was also applied to analyze experiments to evaluate performance of the automatic control system in maintaining thermal comfort during extensive transient metabolic profiles for a range of environmental temperatures. Finally, the model was used to predict the efficacy of the LCG thermal controller for providing thermal comfort for a variety of regimens that may be encountered in future space missions. Simulations with the Wissler model accurately predicted the thermal interaction between the subject and LCG for a wide range of metabolic profiles and environmental conditions and matched the function of the automatic temperature controller for inlet cooling water to the LCG.

scholarly journals Automatic Control of the Middle Route Project for South-to-North Water Transfer Based on Linear Model Predictive Control Algorithm

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1873 ◽  
Author(s):  
Kong ◽  
Quan ◽  
Yang ◽  
Song ◽  
Zhu
Keyword(s):  
Control System ◽  
Model Predictive Control ◽  
Automatic Control ◽  
Predictive Control ◽  
Control Algorithm ◽  
Water Transfer ◽  
Water Delivery ◽  
Real Time Control ◽  
Time Control ◽  
North Water

The application of automatic control to irrigation canals is an important means of improving the efficiency of water delivery. The Middle Route Project (MRP) for South-to-North Water Transfer, the largest water transfer project in China, is currently under manual control. Given the complexity of the MRP, there is an urgent need to adopt some form of automatic control. This paper describes the application of model predictive control (MPC), a popular real time control algorithm particularly suited to the automatic control of multi-pool irrigation water delivery systems, to the MRP using a linear control model. This control system is tested in part of the MRP by means of numerical simulations. The results show that the control system can deal with both known and unknown disturbances, albeit with a degree of resonance in some short pools. However, it takes a long time for the MRP to reach a stable state under the MPC system and the calculation time for the whole MRP network would be too long to satisfy the requirements of real-time control. Suggestions are presented for the construction of an automatic control system for the MRP.

The Automatic Thermal Control System (ATCS) for the EVA Space Suit

1994 ◽  
Author(s):  
Aram Tz. Elbakyan ◽  
Mikhael M. Balashov ◽  
Sergey N. Filipenkov ◽  
Gennady M. Glazov ◽  
Nelly K. Gnoevaya ◽  
...  
Keyword(s):  
Control System ◽  
Thermal Control ◽  
Space Suit ◽  
Thermal Control System

Based on H∞ Robust Control Algorithm for Pole Assignment Problems

2014 ◽  
Vol 494-495 ◽  
pp. 1122-1126
Author(s):  
Hai Jiao Ding ◽  
Wen Gang Che ◽  
Qiang Cao
Keyword(s):  
Control System ◽  
Robust Control ◽  
Automatic Control ◽  
Control Algorithm ◽  
Closed Loop ◽  
Simulation Studies ◽  
Assignment Problems ◽  
Plane Method ◽  
System Robustness ◽  
System Requirements

Study a class of automatic control system and use translational plane method, according to a given system robustness requirements, the closed-loop poles of the system is limited to a certain area, making the system not only meet the robustness of the system requirements, but also make closed-loop poles in a certain area, and find the desired controller. Through simulation studies proved the feasibility and effectiveness of the above algorithm.

Extension Control and its Application in Power System

2011 ◽  
Vol 354-355 ◽  
pp. 1122-1125
Author(s):  
Xue Qin Lu ◽  
Chen Ning Wu ◽  
Shu Guo Chen
Keyword(s):  
Control System ◽  
Control Theory ◽  
Power Systems ◽  
Automatic Control ◽  
Control Algorithm ◽  
Canonical Extension ◽  
Paper Briefly ◽  
Basic Concepts ◽  
Future Work ◽  
Basic Extension

Extension is a new subject which solves sontradictory problems. It studies the extensive possibility of things and the rules and methods of exploitation and innovation with formalized model. The extension control theory and method has provided the basis theory and method for people to solve the existent contradictory questions in the automatic control system such as stability, accuracy and speed.This paper briefly introduces the related basic concepts of extension control, such as the structure of canonical extension control, extension set of character status of basic extension controller, and general extension control algorithm, and so on. Also presents the extension applition in power systems. The future work and prospect of development are described.

Digital Automatic Control System with PID Controller

1970 ◽  
Vol 110 (4) ◽  
pp. 13-16
Author(s):  
A. Petrovas ◽  
S. Lisauskas ◽  
R. Rinkeviciene
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Design Process ◽  
Automatic Control System ◽  
Pid Control ◽  
Pid Controller ◽  
Control Algorithm ◽  
General Purpose ◽  
Simulation Results

The design process of digital automatic control system with PID controller is considered. The solution of problems related with implementation of PID control algorithm into general purpose 8-bit microcontroller is discussed. Simulation results demonstrating performance of system are presented. Ill. 4, bibl. 6, tabl. 3 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.110.4.277

scholarly journals Automatic Taxiing Direction Control System for Carrier-Based Aircraft

2019 ◽  
Vol 8 (2) ◽  
pp. 171-179
Author(s):  
Mariusz Krawczyk ◽  
Cezary Szczepański ◽  
Albert Zajdel
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Control Algorithm ◽  
Proper Method ◽  
Direction Control

This paper solves the problem of automatic taxiing direction control of carrier-based aircraft. On modern aircraft carriers, taxiing aircraft either propel themselves using their own engines or are towed by specialised tugs, which requires dedicated personnel and assets. The automatization of this process would simultaneously increase aircraft flow and decrease the number of personnel and assets required. The key challenge in the automatization of this type of process is the development of an automatic control system capable of performing the requisite tasks, which our researchers managed to do. First, the specific conditions of taxiing on-board carriers were analysed and modelled. The model of a fixed-wing aircraft best suited to this purpose was identified and the proper method of automatic control – ADRC – chosen. The algorithm used in the methodto facilitate effective direction control of a taxiing aircraft was formulated and extensively tested. The results of automatic taxiing simulation for F/A-18 aircraft have been presented. The conclusion is that the ADRC type control algorithm can ensure effective automatic control of taxiing aircraft.

scholarly journals Automatic Control of Human Thermal Comfort by a Liquid-Cooled Garment

1980 ◽  
Vol 102 (2) ◽  
pp. 155-161 ◽  
Author(s):  
L. H. Kuznetz
Keyword(s):  
Thermal Comfort ◽  
Cooling Water ◽  
Thermal Control ◽  
Coolant Temperature ◽  
Space Suit ◽  
Human Thermal Comfort ◽  
Wide Range ◽  
The Difference ◽  
Body Heat ◽  
Human Thermoregulation

Astronauts utilize water cooling in a liquid-cooled garment to maintain thermal comfort during extravehicular activities (EVA’s). In the Apollo and Skylab Programs, manual control of the cooling water was a necessary operation to ensure proper control of body heat storage for the EVA crewman. The development of an automatic thermal control system would be a valuable asset to the conduct of EVA, relieving the crewman of a task that can interfere with his EVA objectives. An analytical model of human thermoregulation was used to develop the equations governing the operation of such an automatic controller. A series of tests verified the feasibiliy of a controller utilizing only a measurement of the difference in coolant temperature into and out of the astronaut’s liquid-cooled garment and an estimate of environmental heat loss to maintain the proper crewman thermal balance. Three test subjects performed over a wide range of metabolic rates, and the crewman heat balance was maintained well within allowable medical limits. This study demonstrates the use of a mathematical model to generate previously unknown physiological relationships between human thermal comfort and liquid cooled garment performance. In so doing, it quantitates physiological parameters that are difficult to relate directly by experiment. Index terms: body temperature regulation, space suit cooling, temperature control, human thermoregulation.

scholarly journals Research of Variable Application Control System Based on Fuzzy Control

2018 ◽  
Vol 38 ◽  
pp. 01013
Author(s):  
JinXia Huang ◽  
Yu Zhang ◽  
XiaoGuang Su ◽  
SiQing Tian
Keyword(s):  
Control System ◽  
Fuzzy Control ◽  
Automatic Control ◽  
Automatic Control System ◽  
Pesticide Residues ◽  
Control Algorithm ◽  
Unit Area ◽  
Pesticide Application ◽  
Simulation Results ◽  
Fuzzy Control Algorithm

The AT89C52 microcontroller and the fuzzy control algorithm is used to design the automatic control system of variable Spraying pesticides. The system adjusts automatically the electric regulating valve according to given Spraying pesticides per unit area so that the actual amount of Spraying pesticides equal to the set value. The simulation model of automatic control system of variable pesticide application was established, and the controller was simulated by MATLAB / SIMULINK software fuzzy control toolbox. The simulation results show that the structure and algorithm of the proposed automatic control system of pesticide application is feasible, The system improves greatly pesticide utilization, reduce pesticide residues and environmental pollution.

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