5. Conclusion
The goal of this study was propose noise reduction measures for the suction housing of a dry vacuum pump used in dentistry. The housing’s noise characteristics were identified, and acoustic analysis was conducted on the impeller area as a noise source. The conclusions
of the study are summarized as follows.
1. The noise level in the suction housing was evaluated during normal operation; the BPF was measured to be 3000 Hz for the 52-blade configuration, meaning that the basic rotation frequency was 57.7 Hz. In noise level measurements, the 3000 Hz noise component was the most significant. Additional measurements of vibration and sound intensity demonstrated that the impeller area was the main noise source.
2. Precision 3D modeling was performed for sound analysis based on reverse engineering. A model for acoustic analysis was completed by extracting only the inner boundaries of the suction housing after completion of 3D modeling. In particular, the boundary element method was applied to obtain the acoustic FRF of the housing. A change in the shape of the suction housing was proposed as a noise reduction measure; this change was developed by identifying the characteristics of the acoustic FRF of the suction housing and reviewing the relation of this FRF to the BPF, the noise source of the suction housing. Additionally,
reducing the number of blades in the impeller was proposed as a measure to reduce noise without degrading performance.
5. ConclusionThe goal of this study was propose noise reduction measures for the suction housing of a dry vacuum pump used in dentistry. The housing’s noise characteristics were identified, and acoustic analysis was conducted on the impeller area as a noise source. The conclusionsof the study are summarized as follows.1. The noise level in the suction housing was evaluated during normal operation; the BPF was measured to be 3000 Hz for the 52-blade configuration, meaning that the basic rotation frequency was 57.7 Hz. In noise level measurements, the 3000 Hz noise component was the most significant. Additional measurements of vibration and sound intensity demonstrated that the impeller area was the main noise source.2. Precision 3D modeling was performed for sound analysis based on reverse engineering. A model for acoustic analysis was completed by extracting only the inner boundaries of the suction housing after completion of 3D modeling. In particular, the boundary element method was applied to obtain the acoustic FRF of the housing. A change in the shape of the suction housing was proposed as a noise reduction measure; this change was developed by identifying the characteristics of the acoustic FRF of the suction housing and reviewing the relation of this FRF to the BPF, the noise source of the suction housing. Additionally,reducing the number of blades in the impeller was proposed as a measure to reduce noise without degrading performance.
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