Sensors and Instrumentation, Volume 5 by Evro Wee Sit Chad Walber Patrick Walter & Steve Seidlitz

Author:Evro Wee Sit, Chad Walber, Patrick Walter & Steve Seidlitz
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(6.7)

6.3.2 Response Synthesis and Transfer Path Contribution

Using the noise removed transmissibility matrix, H*, in Eq. (6.7), we can calculate the response synthesis, Ys, at the receiver. Eq. (6.8) FFT vs. RPM plot in Fig. 6.4 compares the measured response and synthesized response.

Fig. 6.4Comparison between measured and synthesized responses (Measured response at left, synthesized response at right)

(6.8)

For the washing cycle operation speed of the motor, the measured response and synthesized response matched well in the interested frequency range, which can be seen in Fig. 6.5. In Fig. 6.6, structure-borne noise transfer path contributions to the response are presented. At frequency of 125 Hz, which corresponds to 3rd order for motor, as expected we observe the presence of motor in the contribution to measured sound pressure level, although belt – pulley drive system seems more dominant around that frequency interval. At 250 Hz, we observe the effect of resonance frequency associated with tub as it is particularly dominant. It is interesting to note that in high frequency region cabinet is the least effective among the measured structure-borne noise paths, while belt – pulley drive system is persistent in all frequencies.

Fig. 6.5Measured and synthesis response comparison at washing cycle (2520 motor rpm)

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