This paper presents a case study of measurement and analysis methodologies for noise and vibration signals from a small low-rigidity structure (an automotive fuel pump). Previous attempts to perform such analysis using miniature accelerometers failed since even small-added masses and their attachments distorted the dynamics of the structure being measured. Small accelerometers also tend to be sensitive to various measurement noise problems. The present study employed non-contact linear and torsional laser vibrometers as well as holography. Special arrangements were made to allow using a linear laser vibrometer while the measured structure was immersed in a fluid reservoir, and measuring torsional vibration of a stationary pump housing via a laser torsional vibrometer intended for rotating objects. Subtraction of the ambient noise spectrum from overall noise spectra resulted in clear spectral plots. These results demonstrate that radial vibration of a fuel pump was predominant in the low frequency range, torsional vibration in the mid-to-high frequency range, and axial vibration in the high frequency range. The narrow band peaks in the sound spectra were generated primarily by axial vibration induced by fluid/impeller interaction and by torsional vibration of the pump housing. The relative importance of torsional vibration increased with rpm. Contribution from radial vibration to the overall noise level was negligibly small compared to those of axial and torsional vibrations, although the amplitude of the forced vibration in the radial direction was the highest.
Fuel pump vibration and noise measurement and analysis
Noise Control Engineering Journal ; 49 , 6 ; 248-257
2001
10 Seiten, 8 Quellen
Aufsatz (Zeitschrift)
Englisch
Noise and vibration measurement and analysis
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