Department News
가전 제품의 소음진동 기술
Seminar Date
2000-06-15
Author
관리자
Date
2000-06-15
Views
916
1. 제목 : 가전 제품의 소음진동 기술
2. 연사 : 김 성 진 박사
3. 일시 : 1999년 10월1일 (금요일) 11:00
4. 장소 : 301동 1512호
5. 내용 :
General noise and vibration problem of home appliances will be introduced. Three representative technical projects aimed for the development of low noise products, performed by LG Electronics, will be followed. Firstly, abnormal noise problems of refrigerators will be explained. It will be demonstrated that sources of the abnormal noise can be identified with multiple measurement of vibration responses. It will be also demonstrated that such abnormal noises can be effectively reduced by special treatment of capillary tube and evaporator of the refrigerator. Secondly, noise and vibration issues of small compressors will be introduced. It will be explained that the acoustical source characteristics of suction system can be measured to estimate insertion loss of suction muffler. It will be shown that the measured source impedance near cavity resonance frequency band is close to the characteristic acoustical impedance of the refrigerant gas, showing reflection-free condition at the source. It will also be shown that the insertion loss has narrower bandwidth than the transmission loss, demonstrating experienced difficulties in muffler tuning without insertion loss information. Finally, general issues of sound quality for home appliances will be explained. It will be shown that sound quality metrics, such as loudness, sharpness, roughness and fluctuation strength, are more useful for describing the subjective preference of product sounds than the strength related metrics, such as the overall sound pressure level expressed in the A-weighted decibels.
6. 연사 약력 :
1979 - 1983: B.S., Mechanical Engineering, YonSei University
1983 - 1985: M.S., Mechanical Engineering, KAIST
1989 - 1992: Ph.D., Mechanical Engineering, Purdue University, U.S.A
1983 - present: Chief Research Engineer, Home Appliance
Laboratory, LG Electronics
1996 - present: Adjunct Professor, Mechanical Engineering,
Pusan National University
7. 연락처 : 기계항공공학부 김윤영 교수 (전화 : 880-7154)
2. 연사 : 김 성 진 박사
3. 일시 : 1999년 10월1일 (금요일) 11:00
4. 장소 : 301동 1512호
5. 내용 :
General noise and vibration problem of home appliances will be introduced. Three representative technical projects aimed for the development of low noise products, performed by LG Electronics, will be followed. Firstly, abnormal noise problems of refrigerators will be explained. It will be demonstrated that sources of the abnormal noise can be identified with multiple measurement of vibration responses. It will be also demonstrated that such abnormal noises can be effectively reduced by special treatment of capillary tube and evaporator of the refrigerator. Secondly, noise and vibration issues of small compressors will be introduced. It will be explained that the acoustical source characteristics of suction system can be measured to estimate insertion loss of suction muffler. It will be shown that the measured source impedance near cavity resonance frequency band is close to the characteristic acoustical impedance of the refrigerant gas, showing reflection-free condition at the source. It will also be shown that the insertion loss has narrower bandwidth than the transmission loss, demonstrating experienced difficulties in muffler tuning without insertion loss information. Finally, general issues of sound quality for home appliances will be explained. It will be shown that sound quality metrics, such as loudness, sharpness, roughness and fluctuation strength, are more useful for describing the subjective preference of product sounds than the strength related metrics, such as the overall sound pressure level expressed in the A-weighted decibels.
6. 연사 약력 :
1979 - 1983: B.S., Mechanical Engineering, YonSei University
1983 - 1985: M.S., Mechanical Engineering, KAIST
1989 - 1992: Ph.D., Mechanical Engineering, Purdue University, U.S.A
1983 - present: Chief Research Engineer, Home Appliance
Laboratory, LG Electronics
1996 - present: Adjunct Professor, Mechanical Engineering,
Pusan National University
7. 연락처 : 기계항공공학부 김윤영 교수 (전화 : 880-7154)
