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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.
Instrument Panel Skin용 소재의 장기노화 특성연구
서강원(Kangwon Seo),채승철(Seungchul Chae),이영길(Youngkil Lee),박성국(Sungkuk Park) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Environments around a vehicle give many aging-factors. Aging-factors consist of solar light, thermal effect, humidity, chemical pollutant and physical external forces etc.. Fundamentally, Heat and Light play important roles in Polymer Degradation. Heat-aging and Light-aging make most powerful effecs on the polymers that compose the Instument Panel Skin Materials. It is possible to analyze the effects of either Heat or Light for the Skin Materials and those in Outdoor Exposure Test. But We meet the block to find the relationship between Outdoor Exposure Test and Heat/Light-Aging directly. Indirectly, Long-term testing for both Outdoor Exposure and Heat/Light threw a little light on the understanding. Outdoor Exposure Test was executed at Arizona during over 100,000 Langleys. And Heat/Light-aging tests have being taken in lab-scale. Both Light-aging over 2500kJ/㎠ in Ci-4000 and Heat-aging around 1000hr at 120℃ were able to degrade the skins more severely than Outdoor Exposure with 100,000 Langleys.
서강원(Kangwon Seo),성재혁(Jaehyuk Sung),홍경민(Kyungmin Hong),김억(Ok Kim),전용(Yong Chun) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Thermoplastic Vulcalnizations (TPV) was examined to be applied to the rubber parts like guard-valve-body and diaphragm in brake systems. Automotive rubber parts exposed to harsh environmental conditions and duration criteria unlike other industries, are not easy to be replaced with environmentally-friendly thermoplastic material. In Industrial conditions in addition to other polymer material fields, automotive rubber materials have difficuties to meet the friendly-environment conditions. In this study, TPV of PP/EPDM compounds close to the rubber properties in the middle of Thermoplastic Elastomer (TPE) were applied to the rubber parts in the needs like durabilities. Properties were inferior to thermoset rubber, but products performance requirements were satisfied. In brake systems, Guard-valve-body is able to protect the valve-body of booster from foreign matters and to control the air inlet, and Diaphragm is able to induce pressure between the two different rooms and to seal. When TPV of PP/EPDM was apllied for both guard-valve-body and diaphragm, properties results seems to be appropriate in the given environmental conditions. Satisfactory behaviors in automotive parts conditions were able to be determined with PP/EPDM in performance and durability.
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.
서강원(Kangwon Seo),이기양(Keeyang Lee),홍경민(Kyungmin Hong),전용(Yong Jun) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Automobiles always have Severe environmental conditions. Therefore, Rubber parts of automobiles also are exposed to such severe conditions that automobiles have environmentally and durably. Particularly, Brake systems demand heavy durabilities and broad temperature conditions between about 120℃ and -40℃. Due to these conditions, it has been difficult that rubber are substituted to thermoplastic materials in the field of automobile industry. However, Environment-Friendly and Recyclability have made TPV (Thermoplastic Vulcanization) or TPE (Thermoplastic Elastomer) applied to automobile. In North-American and European automobile industry, Many precedents for TPV substitution could be investigated as well as in Japanese industry. In Brake system, PP/EPDM could be satisfied the severe conditions with both durability and environment conditions.