A Gas Path Performance Diagnostic System to Reduce J75-P-17 Engine Overhaul Costs

Abstract

The objective of this program was to develop a performance diagnostic system to analyse gas path performance and to recommend economical component replacement and/or modifications to minimize overhaul costs by increasing post-overhaul acceptance rates at the Oklahoma City Air Logistics Center (OCALC). The diagnostic system utilizes a computer simulation of the J75-P-17 engine which was developed using experimental data from five J75-P-17 engine builds tested at the AEDC. The computer simulation is the heart of the diagnostic system and provides performance partial derivatives to aid in evaluating changes in component behavior. Implementation of the diagnostic system at the OCALC is in progress.

Performance-analysis-based gas turbine diagnostics: A review

“…A review of gas path analysis was given by Smetana [18]. This GPA method has been widely used in applications, such as those of Passalacque [19], Staples and Saravanamuttoo [20], Saravanamuttoo [21], Danielsson [22], Lazalier et al [23], Grewal [24], Escher [25], Escher and Singh [26], Nieden and Fiedler [27], and Simani et al [28]. In this method, the relationship between various engine measurable parameter deltas and unmeasurable component parameter deltas at certain engine operating conditions is expressed with a linear in uence coef cient matrix (ICM):…”

Diagnostic Methods for an Aircraft Engine Performance

“…Advanced engine-fault diagnostics tools offer the possibility of identifying degradation at the module level, determining the trends of these degradations during the usage of the engine, and planning the maintenance action ahead. Therefore the purpose of monitoring systems is to extent to which it can enable the proper deduction of engine faults and minimize the total life cycle costs [88][89][90][91][92][93][94][95][96].…”