ABSTRACT
This chapter describes entire software development process for Engine health management (EHM) systems. It shows how requirements generation and verification and validation are crucial processes within software development that ensure that EHM algorithms deliver value to the customer. A practical consideration for implementing a hybrid engine model involves the application of some form of sequential model building for the construction and specification of the empirical elements. The partitioning of the flight envelope contributes to the concept of sequential modeling in that it allows the construction of a series of submodels to represent the overall model space. The chapter discusses the application of the hybrid model to transient diagnostics and diagnostics related to performance anomalies. Anomaly detection is the act of monitoring the engine parameters to determine, with a sufficient degree of confidence, if they have deviated enough from their normal ranges to be declared anomalous.
