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Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP) >
BVAAP Vol.19 [2011] >
BVAAP Vol.19(2) [December 2011] >
| Title: | Flight control system clearance using static tests at Iron Bird |
| Authors: | Patel, Ambalal V.
Patel, Vijay V.
Deodhare, Girish
Chetty, Shyam |
| Issue Date: | Dec-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The Indian Light Combat Aircraft (LCA) has flown more than 485
flights so far without encountering any major faults in the flight safety
critical fly-by-wire control software. This is partly due to the stringent
quality control process and rigorous testing of the Control Laws (CLAW) and Air
Data System Algorithms (ADS) carried out on various ground platforms such as
Iron bird before flight. The pass/fail criteria for the tests carried out at
the Iron bird test rig are defined based on the tolerance bounds provided on
the expected results which take into account the characteristics of the
associated hardware. These tolerance bounds guarantee that the correctness in
functionality of the modules (CLAW, ADS) is retained, if the set of bounded
inputs generate a set of bounded outputs. The processing of tolerance bounds is
an algorithmic development that plays an important role in defining the
acceptance criteria for the tests and enables clearance (certification) of the
different modules. This paper presents the procedure used for the clearance of
the static tests of the CLAW and ADS on the Iron bird platform. The details on
the pass/fail criteria for the static tests and the tool developed for
generating the bounds are also described. The tolerance bounds for static tests
were evolved based on manufacturer's data, testers experience and engineering
judgment gathered during various levels of testing of ADS and CLAW algorithms.
This process yielded excellent results and was accepted as a formal clearance
methodology for the onboard safety critical software. |
| Page(s): | 163-173 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-2412 (Online); 0771-7706 (Print) |
| Source: | BVAAP Vol.19(2) [December 2011]
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