Fault conditions diagnostic technique for firing trials based on controlled parameters measurements

Аuthors

Knyazeva V. V.^1*, Chubarov O. U.^2**, Neretin E. S.^3***

1. ,
2. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
3. ,

*e-mail: knyazeva_valya@mail.ru
**e-mail: chubarovy@rambler.ru
***e-mail: evgeny.neretin@ic.irkut.com

Abstract

The goal if this work is functionality enhancement and software and hardware development for liquid thruster firing trials software and hardware complex based on algorithmic and hardware development for automated information and measuring and controlling systems (IM&CS) with the possibility of fault conditions functional diagnostics during liquid thruster continuous running.

Designed automated firing trials IM&CS allows testing of the existing and emerging liquid thrusters operating on ecologically clean propellant components and uses the function testing methods of faulty states during liquid thruster continuous running to determine emerging failures.

The applied methods are based on complex systems mathematical modeling and simulation methods, theory of measuring and measuring transducers, function tests theory, experimental research as well as bench trial and full-scale tests methods.

The developed fault conditions function tests technique uses fault condition classes as well as secondary features selected as fault characteristics. Fault conditions of each class causing new static mode of the thruster are c encoded by selected secondary features. The developed algorithms realizing the developed technique together with fault diagnostics algorithm allow assigning lined-up faulty condition to a certain class or classes in order to determine a failed sensory element or elements. We realized these algorithms in the form of software «Liquid Thrusters Fault Conditions Diagnostic Module». To develop the software we use Delphi package of Embarcadero RAD Studio XE.

Using the developed automated IM&CS included into thruster firing trials software and hardware complex we carried out tests of such thrusters as DMT MAI 202 operating on kerosene and oxygen (g); as well as thrusters DMT MAI-200-1P DMT MAI-200-7P DMT MAI-500VPVK operating on high-concentration hydric dioxide (HCHD 98%) and kerosene. We also carried out first stage tests related to developing prospective liquid thrusters operating on clear propellant components. Implementation of suggested algorithms allows expansion of firing trials software and hardware thrusters in the pipeline and prospective ones.

We carried out more than 400 experiments to test the developed software. These experiments fully confirmed its functionality with respect to fault conditions function tests.

The adequacy of the developed techniques and algorithms applied to fault conditions diagnostic subsystem for liquid thrusters in continuous running was fully confirmed in the course of liquid DMT MAI 200 thruster firing trials when fault conditions occurred.

Application of the developed IM&CS with the possibility of functional diagnostics of the liquid thrusters faulty states in continuous running allowed to reduce the amount of fire tests by 9% for DMT MAI 200 thruster development and studying.

Keywords:

measurements of controlled parameters, information and measuring and control system for fault conditions diagnostic, functional diagnostics of the units under test

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