Space Experiment "Trubka": Automatic Control and System of Temperature Measurement

Anatoliy G. Kostornov; Mikhail N. Surdu; Gennadiy A. Frolov; Alexander L. Lameko; Andrey A. Shapoval; Yuriy A. Elanskiy; Victor G. Tikhiy; Irina A. Gusarova; Irina V. Shapoval

doi:10.1615/jautomatinfscien.v40.i5.50

Space Experiment "Trubka": Automatic Control and System of Temperature Measurement

Journal of Automation and Information Sciences ◽

10.1615/jautomatinfscien.v40.i5.50 ◽

2008 ◽

Vol 40 (5) ◽

pp. 61-67 ◽

Cited By ~ 1

Author(s):

Anatoliy G. Kostornov ◽

Mikhail N. Surdu ◽

Gennadiy A. Frolov ◽

Alexander L. Lameko ◽

Andrey A. Shapoval ◽

...

Keyword(s):

Automatic Control ◽

Temperature Measurement ◽

Space Experiment

Download Full-text

The design and implementation of digital temperature measurement and automatic control system

2010 International Conference on Computer Application and System Modeling (ICCASM 2010) ◽

10.1109/iccasm.2010.5622733 ◽

2010 ◽

Cited By ~ 3

Author(s):

Wenlian Li ◽

Yang Li ◽

Fan Xiao

Keyword(s):

Control System ◽

Automatic Control ◽

Temperature Measurement ◽

Automatic Control System ◽

Design And Implementation

Download Full-text

АНАЛИЗ ПОГРЕШНОСТЕЙ ЭКСПЕРИМЕНТАЛЬНОГО ОПРЕДЕЛЕНИЯ ДИНАМИЧЕСКИХ ХАРАКТЕРИСТИК ТЕРМОПАРЫ В УСЛОВИЯХ ДВИГАТЕЛЯ С ИСПОЛЬЗОВАНИЕМ СКАЧКООБРАЗНОГО ВОЗДЕЙСТВИЯ

Aerospace technic and technology ◽

10.32620/aktt.2020.7.05 ◽

2020 ◽

pp. 31-40

Author(s):

Сергей Валерьевич Епифанов ◽

Ли Цицзе

Keyword(s):

Automatic Control ◽

Temperature Measurement ◽

Time Constant ◽

Thermal Stresses ◽

Dynamic Error ◽

Measurement Channel ◽

Inlet Temperature ◽

Dynamic Parameters ◽

Gas Temperature ◽

Dynamic Errors

The turbine inlet temperature is one of the major thermodynamic parameters that determine specific thrust and specific fuel consumption of the turbine engine. The gas temperature also influences the temperature of the engine parts, hence thermal stresses and the ability of materials to support static and cyclic loads. Therefore, the temperature limitation is one of the main tasks of the engine automatic control system. Because of a significant influence of the gas temperature on parameters of the working process, strength, and life-time of parts, the temperature must be limited with high precision.The paper is focused on dynamic parameters of the temperature measurement channel, which contains consequently linked engine, thermocouple, and the dynamic corrector. Errors of the corrector tuning, which mainly depend on the error of thermocouple time constant setting, cause dynamic errors in the temperature determining and the corresponding errors of automatic control. The paper considers the influence of the corrector tuning error on a dynamic error of the temperature determination. The equations are derived that relate the dynamic error with dynamic parameters of the engine and dynamic parameters of the temperature measurement channel. These equations can be used in the synthesis of this channel, which satisfies the set requirements to the temperature determining precision. The simplest case is considered when the thermocouple is represented as an inertial dynamic link, which single dynamic parameter is the time constant. Then the above-mentioned equations relate the thermocouple time constant with the error of temperature measurement and allow formulating requirements to a precision of its experimental determination.The final part of the paper considers the error of thermocouple time constant experimental determining. The relations are derived that allow analyzing this error under influence of such parameters as the measuring error, interval of observations, measuring frequency and dynamic properties of the engine and the thermocouple.

Download Full-text

The effect of back-melting on the continuity of crystallographic orientation and composition in HgZnTe

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100133114 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1696-1697

Author(s):

H.J. Zuo ◽

M.W. Price ◽

R.D. Griffin ◽

R.A. Andrews ◽

G.M. Janowski

Keyword(s):

Directional Solidification ◽

Space Shuttle ◽

Solidification Process ◽

Space Experiment ◽

Infrared Detection ◽

Directionally Solidified ◽

Crystallographic Defects ◽

Semiconducting Alloys ◽

Uniform Composition ◽

Growth Experiments

The II-VI semiconducting alloys, such as mercury zinc telluride (MZT), have become the materials of choice for numerous infrared detection applications. However, compositional inhomogeneities and crystallographic imperfections adversly affect the performance of MZT infrared detectors. One source of imperfections in MZT is gravity-induced convection during directional solidification. Crystal growth experiments conducted in space should minimize gravity-induced convection and thereby the density of related crystallographic defects. The limited amount of time available during Space Shuttle experiments and the need for a sample of uniform composition requires the elimination of the initial composition transient which occurs in directionally solidified alloys. One method of eluding this initial transient involves directionally solidifying a portion of the sample and then quenching the remainder prior to the space experiment. During the space experiment, the MZT sample is back-melted to exactly the point at which directional solidification was stopped on earth. The directional solidification process then continues.

Download Full-text