표제지
요약문
목차
1장 서론 10
1.1. 연구 배경 10
1.2. 연구 내용 11
1. 문헌조사 11
2. 자기장 해석 12
3. 차음성능 잔향실 실험 12
2장 이론적 고찰 14
2.1. MR Elastomer 검토 14
2.2. 차음성능 이론적 검토 15
2.3. 차음성능 측정 방법 21
3장 자기장 해석 22
3.1. 해석 절차 22
3.2. 자기장 해석 24
3.3. 자기장 해석 결과 27
4장 차음성능 실험 및 평가 32
4.1. 실험의 구성 32
4.2. 실험 결과 37
5장 결론 41
Reference 43
Table. 3.1. Result of magnetic field analysis 30
Table. 4.1. Size of sample for applied to the experiment 32
Table. 4.2. Experimental equipment 35
Fig. 1.1. Research flow chart 13
Fig. 2.1. Incidence, transmission and reflection of sound 15
Fig. 2.2. Transmission loss of Single panel 16
Fig. 2.3. Coincidence effect 20
Fig. 3.1. B-H Curve for MRE 23
Fig. 3.2. Hysteresis stress strain curves for MRE 24
Fig. 3.3. Magnetic field analysis model (Separation distance 2㎜) 25
Fig. 3.4. Magnetic field analysis model (Separation distance 3㎜) 25
Fig. 3.5. Magnetic field analysis model (Separation distance 5㎜) 26
Fig. 3.6. Magnetic field analysis model (Separation distance 7㎜) 26
Fig. 3.7. Magnetic field analysis model (Separation distance 10㎜) 27
Fig. 3.8. Magnetic field analysis result (Separation distance 2㎜) 28
Fig. 3.9. Magnetic field analysis result (Separation distance 3㎜) 28
Fig. 3.10. Magnetic field analysis result (Separation distance 5㎜) 29
Fig. 3.11. Magnetic field analysis result (Separation distance 7㎜) 29
Fig. 3.12. Magnetic field analysis result (Separation distance 10㎜) 30
Fig. 3.13. Magnetic field analysis result 31
Fig. 4.1. Jig for sound insulation performance experiment 33
Fig. 4.2. Permanent magnet installed in jig 33
Fig. 4.3. Laboratory Plan (NSV) 34
Fig. 4.4. Experimental photograph of microphone and MRE sample 35
Fig. 4.5. Experimental photograph of different location noise source 36
Fig. 4.6. Transmission loss of MRE with magnetic field 37
Fig. 4.7. Insertion loss of MRE with magnetic field(125, 160㎐ band) 38
Fig. 4.8. Insertion loss of MRE with magnetic field(250㎐ band) 39
Fig. 4.9. Insertion loss of MRE with magnetic field(2.5㎑ band) 40