Analysis of the HVAC system’s sound quality using the design of experiments |
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Authors: | Sang-Gil Park Hyun-Jin Sim Ji-Hyun Yoon Jae-Eun Jeong Byoung-Jae Choi Jae-Eung Oh |
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Affiliation: | 1. Department of Mechanical Engineering, Hanyang University, Seoul, 133-791, Korea 2. School of Mechanical Engineering, Hanyang University, Seoul, 133-791, Korea
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Abstract: | Human hearing is very sensitive to sound, so a subjective index of sound quality is required. Each situation of sound evaluation
is composed of Sound Quality (SQ) metrics. When substituting the level of one frequency band, we could not see the tendency
of substitution at the whole frequency band during SQ evaluation. In this study, the Design of Experiments (DOE) is used to
analyze noise from an automotive Heating, Ventilating, and Air Conditioning (HVAC) system. The frequency domain is divided
into 12 equal parts, and each level of the domain is given an increase or decrease due to the change in frequency band based
on the “loud” and “sharp” sound of the SQ analyzed. By using DOE, the number of tests is effectively reduced by the number
of experiments, and the main result is a solution at each band. SQ in terms of the “loud” and “sharp” sound at each band,
the change in band (increase or decrease in sound pressure) or no change in band will have the most effect on the identifiable
characteristics of SQ. This will enable us to select the objective frequency band. Through the results obtained, the physical
level changes in arbitrary frequency domain sensitivity can be determined. |
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