Implementation of an acoustic stall detection system using near-field diy pressure sensors
| Autor: | Cecilia Tortora, Alessandro Corsini, Sara Feudo, Anthony G. Sheard, Graziano Ullucci |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Engineering
acoustic detection chaos Piezoelectric sensor 020209 energy Acoustics Energy Engineering and Power Technology 02 engineering and technology phase space reconstruction law.invention 0203 mechanical engineering Mechanical fan law Turbomachinery 0202 electrical engineering electronic engineering information engineering low speed axial fan stall detection business.industry Mechanical Engineering Piezoresistive effect Piezoelectricity Pressure sensor 020303 mechanical engineering & transports Transducer Pressure measurement business |
| Zdroj: | Scopus-Elsevier |
| Popis: | In this paper, the use of DIY transducers is proposed to detect the pressure instabilities in a low-speed industrial axial fan. The authors aim is to detect rotating stall, a well-studied aerodynamic instability with a typical frequency that can be even lower than 10 Hz in low-speed industrial fans. Pressure transducers and piezoelectric sensors, such as microphones, in turbomachinery are used respectively in the near and far field as standard methods to perform time-resolved pressure measurements. Other classes of sensors, such as electret microphones, may be not suited for pressure measurements, especially in the ultrasound region because their cut-off frequency is about 20 Hz. In this study, the authors use a low-cost DIY technology, as alternative technology to stall detection, in comparison with a high precision piezoelectric sensor. The authors performed the pressure measurements using a dynamic transducer, a piezoresistive transducer, and a piezoelectric high sensitivity sensor that provides the measurement baseline. They implemented and set-up a measurement chain to identify the typical rotating stall pattern in low-speed axial fans. The results have been validated with respect to the state-of-the-art acoustic control techniques described in literature. The signals acquired using the two technologies are discussed using a combination of spectral and time-domain space reconstruction. The acoustic patterns obtained through the phase space reconstruction show that the DIY dynamic sensor is a good candidate solution for the rotating stall acoustic analysis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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