5. .etrie.al by output power.In this mode， the user should input the output power range of interest and thus obtain only data applying tothat particular power setting. In thismanner， he has only to consider the pertinent data to pinpoint the problem areas.
6. .etrie.al by two or more limiting parameters. By retrieving data withlimits on several parameters， the data can be evaluated and will be even further reduced. Diagnostic criteria can then be developed.
Summary
1. The
monitoring of turbomachinery mechanical characteristics， suchasvibrations， has been applied extensively over the past decade. The advent of the accelerometer and the real-time vibration spectrum analyzer has required a computer to match and utilize the extensive analysis and diagnostic capability of these instruments.
2. The high cost for machinery replacements and downtime makesmachinery operational reliability very important; however， with thecurrent and projected increases in fuelcosts， aerothermal monitoring has become very important. Aerothermal monitoring can provide notmerely increased operational efficiency for turbomachinerybut， whencombined with mechanical monitoring， it provides an overall， more effective system than one that monitors only the mechanical functions or aerothermal functions.
3. While there had been concern about the reliability of computer sys-tems， they are currently receiving wide acceptance and are fast repla-cing analog systems.
4. The
systematized application of modern technology (instrumentation， both mechanical and aerothermal and low-cost computers) and turbo-machinery engineering experience will result in the development and application of cost-effective systems.
Bibliography
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Boyce，M.P.， ..How to Identify and Correct Efficiency .osses Through ModelingPlantThermodynamics，.. Proceedings of the CCGT Generation Power Con-ference，.ondon， United.ingdom，March， 1999.
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Meher-Homji，C.B.，Boyce，M.P.，.akshminarasimha，A...，Whitten，..A.， andMeher-Homji，F...， ..Condition Monitoring and Diagnostic Approaches forAdvanced GasTurbines，.. Proceedings of ASME Cogen Turbo Power1993，7th Congress and Exposition on Gas Turbines in Cogeneration andUtility，Sponsored by ASME in participation ofBEAMA， IGTI-.ol. 8Bournemouth，United.ingdom， September 21-23，1993， pp. 347-55.
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