Abstract:This paper provides a contribution to the understanding of both the vibroacoustical behavior and the influence of passive constrained layer damping (PCLD) applications on the sound radiation of a grid-stiffened panel. A test specimen is manufactured and an experimental set-up with a synthetic turbulent boundary layer excitation is developed. In addition, a numerical model is created and updated with the results of an experimental modal analysis. Further, the acoustic effect of PCLD applied to the ribs and to t… Show more
“…Te issue of low-frequency noise is of utmost severity. Due to engineering constraints on the compressor type, passive noise reduction measures are often employed to address such issues [9]. Damping materials are favored for their capacity to deliver outstanding sound insulation performance in passive control strategies [10,11].…”
A novel split-type air conditioning system is introduced to balance usability and portability. Unlike conventional split-type systems, where the compressor is typically placed outside, this system situates the compressor within the indoor unit, which may expose users to compressor noise. There are prominent peaks in the compressor noise spectrum, particularly at the compressor operating frequency and its harmonics, notably the second and third harmonics. The research presents a multilayered acoustic enclosure specifically designed for air conditioning compressors to address this issue without modifying the compressor or indoor unit casing. In order to get better sound insulation performance, a response surface methodology (RSM) is applied to optimize the thickness ratio, open area ratio, and open area height of the acoustic enclosure with predefined thickness. In addition, topological optimization is employed to strengthen weak areas of the acoustic enclosure. Then, experimental trials using the proposed acoustic enclosure are conducted in a semianechoic chamber. Results demonstrate significant reductions in noise levels, including 7.99 dB(A), 5.69 dB(A), and 5.19 dB(A) reductions in the fundamental frequency, second harmonic, and third harmonic noise of the compressor’s operating frequency, respectively.
“…Te issue of low-frequency noise is of utmost severity. Due to engineering constraints on the compressor type, passive noise reduction measures are often employed to address such issues [9]. Damping materials are favored for their capacity to deliver outstanding sound insulation performance in passive control strategies [10,11].…”
A novel split-type air conditioning system is introduced to balance usability and portability. Unlike conventional split-type systems, where the compressor is typically placed outside, this system situates the compressor within the indoor unit, which may expose users to compressor noise. There are prominent peaks in the compressor noise spectrum, particularly at the compressor operating frequency and its harmonics, notably the second and third harmonics. The research presents a multilayered acoustic enclosure specifically designed for air conditioning compressors to address this issue without modifying the compressor or indoor unit casing. In order to get better sound insulation performance, a response surface methodology (RSM) is applied to optimize the thickness ratio, open area ratio, and open area height of the acoustic enclosure with predefined thickness. In addition, topological optimization is employed to strengthen weak areas of the acoustic enclosure. Then, experimental trials using the proposed acoustic enclosure are conducted in a semianechoic chamber. Results demonstrate significant reductions in noise levels, including 7.99 dB(A), 5.69 dB(A), and 5.19 dB(A) reductions in the fundamental frequency, second harmonic, and third harmonic noise of the compressor’s operating frequency, respectively.
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