Model based performance analysis is also known as Analysis by Synthesis, abbreviated to AnSyn. The method combines test analysis and performance prediction in a single program. The program calculates modifiers for the component models – the AnSyn factors - in a special test analysis mode, which make the model agree exactly with the measured data. In this chapter we describe how AnSyn is used in GasTurb across a range of engine configurations and degrees of instrumentation. We give an example of test analysis on a heavily instrumented development engine as well as a production engine returned to a maintenance shop with much fewer sensors. The chapter concludes with a real-world example of trend monitoring using the very limited instrumentation available during airline operations, and this illustrates compressor deterioration after thousands of flight cycles. Model based performance analysis is the industry standard during engine development and can identify small differences between components when hardware is modified. It also provides a simple method to correct measured performance to standard conditions.
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