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방향성을 가진 회전체 소음의 청각계 인지 특성에 관한 연구
서강원(Kang-Won Seo),김의열(Eui-Youl Kim),김성기(Sung-Ki Kim) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
This paper presents the HRTF based experimental approach to figure out why the human auditory perception on the interior noise source including the directional tonal components does not well match with the dominant features extracted from recorded acoustic signals in terms of psychoacoustics. Since the general objective evaluation models for tonalness among various sound attributes are a function of width, frequency, excessive level of tonal components respectively, the directional tonal components cannot be properly evaluated without considering the effects of headrelated transfer function on the binaural auditory perception. Thus, the directivity of source is additionally considered to prevent the erroneous conclusions from the same sound source in the process of source identification. The signal synthesis technique is used to solve a little difficulty in measuring all of desired acoustic signals for jury evaluation. The sound attributes of synthetic acoustics signals are analyzed to roughly predict the results of jury evaluation in advance by using sound quality factors such as loudness, sharpness, roughness, fluctuation strength and tonality. The jury evaluation is carefully conducted based on the recommended guideline suggested by N. Ottoet al. Each sound is respectively evaluated by selecting a value between -2 and 2 in intervals of 0.2 point. Through above procedure, based on the results of jury evaluation, it is confirmed that serious problems can be caused in the process of analyzing the dominant sound attributes in terms of psycho-acoustics according to the type of a microphone and a playback system.
Crash PAD 표피재의 열노화에 따른 특성변화 연구
서강원(Kang-won Seo),박성국(Sung-Kuk Park),이영길(Young-kil Lee),채승철(Seung-chul Chae) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Crash pad for automotive interior is composed of substrate, foam pad, and surface skin. Therefore, physical properties of crash pad are dependent on those components. However, chemical and thermal properties of material such as mechanical strength, elongation, and brittleness in low temperature are deteriorated along with heat and light exposure in certain period of time. In this study, physical and chemical properties of heat aged crash pad surface material have been investigated.