Accession Number : ADA290223

Title :   Sensor Fault Detection and Diagnosis Simulation of a Helicopter Engine in an Intelligent Control Framework.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Litt, Jonathan ; Kurtkaya, Mehmet ; Duyar, Ahmet

PDF Url : ADA290223

Report Date : NOV 1994

Pagination or Media Count : 15

Abstract : This paper presents an application of a fault detection and diagnosis scheme for the sensor faults of a helicopter engine. The scheme utilizes a model-based approach with real time identification and hypothesis testing which can provide early detection, isolation, and diagnosis of failures. It is an integral part of a proposed intelligent control system with health monitoring capabilities. The intelligent control system will allow for accommodation of faults, reduce maintenance costs, and increase system availability. The scheme compares the measured outputs of the engine with the expected outputs of an engine whose sensor suite is functioning normally. If the differences between the real and expected outputs exceed threshold values, a fault is detected. The isolation of sensor failures is accomplished through a fault parameter isolation technique where parameters which model the faulty process are calculated on-line with a real-time multivariable parameter estimation algorithm. The fault parameters and their patterns can then be analyzed for diagnostic and accommodation purposes. The scheme is applied to the detection and diagnosis of sensor faults of a T700 turboshaft engine. Sensor failures are induced in a T700 nonlinear performance simulation and data obtained are used with the scheme to detect, isolate, and estimate the magnitude of the faults.

Descriptors :   *AIRCRAFT MAINTENANCE, *TURBOSHAFT ENGINES, *COMPUTER AIDED DIAGNOSIS, TEST AND EVALUATION, OUTPUT, SIMULATION, CONTROL SYSTEMS, DETECTION, DETECTORS, MONITORING, REAL TIME, PARAMETERS, THRESHOLD EFFECTS, FAILURE, ISOLATION, COSTS, IDENTIFICATION, AVAILABILITY, HELICOPTERS, HYPOTHESES, FAULTS.

Subject Categories : Helicopters
      Computer Programming and Software
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE