Sound-absorbing pad from sunflower seed shells
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Abstract
The purpose of this research was to create and test sound-absorbing pads from agricultural waste. A waste material from sunflower seed shells was processed into two types of sound-absorbing pads: 1) sunflower seed shell type and 2) sunflower seed shell powder type. The ability to absorb sound was tested using a set of sound sources as test equipment. The sound source was capable of adjusting the frequency from 100 to 2,000 hertz, and a sound receiver, specifically the Mastech MS6708 model, an IEC651 standard-compliant sound intensity measuring device, was used for testing. The test involved placing a sound-absorbing pad between two pipes. The test results indicated the sound level at each frequency (dB) and the ability to absorb sound (α). Based on the test, it was discovered that the sound level inside the test unit, without the installation of sound-absorbing pads, averaged at 94.4±8.7 decibels (dB). When considering the sound-absorbing pads, the average noise levels were 76.7±9.9 and 65.4±10.4 decibels (dB) for pads made from sunflower seed shells and sunflower seed shell powder, respectively. These pads were found to possess the capability to attenuate sound, resulting in a reduction in noise levels with a sound absorption coefficient (α) ranging from 0.69 to 0.81. This research presents an alternative approach to maximizing the utilization of agricultural waste by processing it into sound-absorbing pads.
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References
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