| Summary: | Background and Objective: Noise absorber is considered the main method
for noise control in propagation path. This study aimed to evaluate the
effectiveness of environmental noise control using noise absorbers at a press
workshop based on the recommended ISO 11690 method.
Materials and Methods: This experimental study was performed at a press
workshop of a metal structure company. The environmental noise control
was established by the installation of a metal mesh using perforated gypsum
tiles with a layer of stone wool at the ceiling. Afterward, the evaluation was
conducted based on the ISO 11690 method which included the determination
of the rate of noise reduction measurement from an omnidirectional source
based on the distance doubling. Moreover, the noise level was measured at
the defined distance from an artificial noise source along with the length of
the workshop.
Results: The environmental noise was reduced approximately (3 to 4 dB)
after the installation of an acoustic ceiling. Furthermore, the environmental
noise reduction was considerable at the frequency spectrum of 2000 Hz,
4000 Hz, and 8000 Hz. At the press workshop, the noise was reduced 4 dB
based on the distance doubling from an omnidirectional source indicating a
reduction in the surface noise reflections of the press workshop
Conclusion: The efficiency of the environmental noise control was
determined at high accuracy using noise reduction curve from an
omnidirectional source, comparison of the results with the recommended
optimal conditions, and sound propagation pattern in the free field of the
sound.
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