New Fuel Gauging Technique for LCA

Shantha Kumar, N and Rao, Narayana P and Naidu, VPS and Girija, G New Fuel Gauging Technique for LCA. Project Report. CSIR-NAL.

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Abstract

New in-flight fuel estimation technique for LCA has been proposed using least square (LS) method. This report contains the details of LS models for aircraft fuel estimation, the procedure for building the LS models and their utilization to estimate the fuel quantity in the internal fuel tanks of LCA from flight data. Initially a set of LS coefficients has been estimated separately for each FCG (Fuel Capacitance Gauging) probes using individual FCG probe count, aircraft accelerations, aircraft attitudes and the reconstructed fuel content time history (of the fuel tank in which the particular probe is located) from the same flight data. Using the estimated LS coefficients, an algorithm ‘FELS’ (Fuel Estimation by Least Squares technique) has been developed in MATLAB to estimate fuel content in the internal tanks of LCA. The performance of the FELS has been verified with 56 different flight data of PV2, PV3, LSP1 and LSP2 aircraft (flights without drop tanks) and compared with lookup table based estimates, the technique currently being used on LCA. Few results of fuel quantity estimates by FELS in the internal fuel tanks of LCA/Tejas from flight data (with and without probe failure cases) are presented and discussed in this report. FELS algorithm is computationally simple (consists only multiplication and averaging) compared to the currently used table lookup method. From the fuel estimation results it is observed that the fuel estimates by FELS is smoother and closer to DTOT compared to table lookup estimates currently being employed. Sensitivity of the FELS code to probe failures has been studied by simulating multiple probe failures in flight data.

Item Type: Proj.Doc/Technical Report (Project Report)
Subjects: AERONAUTICS > Aeronautics (General)
Division/Department: Flight Mechanics and Control Division, Flight Mechanics and Control Division, Flight Mechanics and Control Division, Flight Mechanics and Control Division
Depositing User: Dr VPS Naidu
Date Deposited: 30 May 2011 15:34
Last Modified: 30 May 2011 15:36
URI: http://nal-ir.nal.res.in/id/eprint/9184

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