목차

목 차
목 차 i
그림 목차 iii
요약문 v
Abstract vi
제 1 장 서 론 1
제 2 장 이 론 3
2.1 상관관계 (Correlation) 3
2.2 파워 스펙트럼 밀도 함수 (Power spectral density function) 4
2.3 일반 기여도 함수 (Ordinary Coherence Function) 6
2.4 다입력 / 단일 출력 모델링 6
2.5 부분기여도 함수 (Partial Coherence Function) 9
제 3 장 검증 실험 12
3.1 실험 과정 12
3.2 부분기여도 분석을 이용한 검증 15
제 4 장 실험적 응용 19
4.1 실험 방법 19
4.2 샤시 다이나모 실험 19
4.2.1 실험 장비 20
4.2.2 센서위치 23
제 5 장 실험 결과 및 고찰 26
5.1 고압펌프의 기여도 분석 27
5.2 인젝터의 기여도 분석 32
5.3 연료레일의 기여도 분석 35
5.4 압력센서의 기여도 분석 37
제 6 장 결 론 40
참고 문헌 41
그림 목차
Figure.1 One sided and two-sided spectral density function 5
Figure.2 Multi-input / single-output model of dynamic system for the vibration path analysis 7
Figure.3 Two-input/single-output model of a dynamic system with independent two
sources 8
Figure.4 Two-input/single-output model of a dynamic system with partially correlated sources 8
Figure.5 Vibration control system by using Exciter 13
Figure.6 Experiment devices for identification of partial coherence 13
Figure.7 Experiment set-up for identification of partial coherence 14
Figure.8 Experiment set-up : (a) (b) (c) 14
Figure.9 Multi-input/single-output modeling for vibration path analysis of a pressure pump model (a) 16
Figure.10 Multi-input/single-output modeling for vibration path analysis of a pressure pump model (b) 17
Figure.11 Ordinary coherence between engine(X1) and pressure pump_up(Y) and ordinary coherence between pump_mid(X2) and pressure pump_up(Y) 17
Figure.12 Partial coherence between engine(X1) and pressure pump_up(Y) and partial coherence between pump_mid(X2) and pressure pump_up(Y) 18
Figure.13 Experiment set-up for identification of vibration path in Gamma gasoline direct injection (GDI) Engine 20
Figure.14 Gamma gasoline direct injection (GDI) Engine 20
Figure.15 DAQ-equipments, charge amplifier, chassis dynamometer 21
Table 1 Testing devices 22
Table 2 The Conditions of chassis dynamometer Test 22
Figure.16 Position of sensors for measurement of pressure pump vibration 24
Figure.17 Position of sensors for measurement of injector 24
Figure.18 Position of sensors for measurement of fuel rail 25
Figure.19 Position of sensors for measurement of pressure sensor 25
Figure.20 Flow chart for the calculation of partially correlated coherent outputs in GDI engine component 26
Figure.21 Multi-input/single-output modeling for vibration path analysis of a pressure pump 28
Figure.22 Ordinary coherence between engine(X1) and pressure pump_up(Y) and ordinary coherence between pump_mid(X2) and pressure pump_up(Y) 28
Figure.23 Partial coherence between engine(X1) and pressure pump_up(Y) and partial coherence between pump_mid(X2) and pressure pump_up(Y) 29
Figure.24 Vibration contribution of gasoline direction injection components in pressure pump vibration 31
Figure.25 Quantification of vibration contribution of gasoline direction injection components at frequency range in pressure pump vibration 31
Figure.26 Operational Deflection Shapes(ODS) of Engine 32
Figure.27 Multi-input/single-output modeling for vibration path analysis of a fuel injector 33
Figure.28 Vibration contribution of gasoline direction injection components in a fuel injector 34
Figure.29 Quantification of vibration contribution of gasoline direction injection components at frequency range in a fuel injector 34
Figure.30 Multi-input/single-output modeling for vibration path analysis of a fuel rail 35
Figure.31 Vibration contribution of gasoline direction injection components in a fuel rail 36
Figure.32 Quantification of vibration contribution of gasoline direction injection components at frequency range in a fuel rail 36
Figure.33 Multi-input/single-output modeling for vibration path analysis of a pressure sensor 38
Figure.34 Vibration contribution of gasoline direction injection components in pressure sensor 38
Figure.35 Quantification of vibration contribution of gasoline direction injection components at frequency range in pressure sensor 39