THE STOCHASTIC STRUCTURE OF DOWNSTREAM PRESSURE FROM AN AXIAL COMPRESSOR—I. A PERIODIC TIME–FREQUENCY SPECTRAL DESCRIPTION

✍ Scribed by D. VanZante; R.L. Feddersen; M. Suarez; P.J. Sherman

• Book ID: 102615657
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 255 KB
• Volume: 10
• Category: Article
• ISSN: 0888-3270
• DOI: 10.1006/mssp.1996.0029

✦ Synopsis

This work investigates the potential of recently developed spectral analysis methods for non-stationary periodic random processes for extracting information associated with the downstream pressure signature of a single row 36 blade axial compressor. First, it is shown that the pressure signature is not wide sense stationary (wss) when collection and processing are carried out in a way synchronous with the shaft speed, as is usually the case. This suggests that traditional spectrum estimation methods commonly used may lead to ambiguous, if not misleading results. To accommodate the non-stationarity associated with synchronous data collection, while adhering to the periodic nature of the phenomena, recently developed signal processing tools for spectral analysis of periodic random processes are applied. It is shown that these tools can provide notably more detailed information about the intracycle structure of the pressure signature than can be provided by traditional methods of analysis.