초록

1. 비틀림 및 굽힘진동 측정실험용 치차전동장치 설계$\cdot$제작
2. 치차 전동장치 모델의 비틀림 고유진동 해적
3. 치차 전동장치 모델의 비틀림 및 굽힘 고유진동수 측정방법 개발
4. 치차의 Gear meshing을 이용한 손상상태 진단알고리즘 개발
5. 크랭크축계의 종진동 이론해석
6. 크랭크축계의 종$\cdot$비틀림 연성진동의 이론적 해석

Abstract ▼

The importance of rotating machinery is getting more and more emphasized in modem industry. It is because most power is transmitted through rotating machinery. The noise and vibration generated by rotating machinery has become a hot issue in this field due to the otherwise sophisticated technology a

The importance of rotating machinery is getting more and more emphasized in modem industry. It is because most power is transmitted through rotating machinery. The noise and vibration generated by rotating machinery has become a hot issue in this field due to the otherwise sophisticated technology and the leveling-up of human life. In precision industries, this problem may stifle the company itself.
The vibration problem is directly related to the safety in such industries as power plants. In automobile industries, the noise and vibration problems of the engine are closely related to the upgrading of the product. To solve this vibration problem, it is essential to understand the vibration source and to measure the vibration precisely. The vibration measurement should be carried out by noncontact method not to influence the rotating system itself.
In the final year, the main subjects to be studied are the measurement and analysis of the shaft vibrations such as torsional vibration and bending vibration. These vibrations were mainly measured using noncontact eddy current probes. A geared power transmission system was constructed to carry out measurements related to torsional and bending vibrations. Torsional and bending natural frequencies of the system were obtained by analytical and experimental method. The two results agree very well. A special phenomenon was found for the bending natural frequency. The bending natural frequency found at static state is divided into two frequencies and departs from each other as the rotating speed increases. This phenomenon is believed to be due to the qyroscopic effect of the inertial mass but it is not conformed.
An algorithm was developed to monitor and diagnose the status of gear teeth by analysing the vibration signal of the gear tooth meshing. The vibration signal from the rotor with bad gear teeth showed bigger tooth meshing signal than the rotor with normal teeth. It also showed side band signals according to the rotating speed of two gear axes.
Another topic was to establish a theory on the coupled torsional -axial vibration occurred in the crankshaft of internal combustion engines. Here a new model was established with is quite different from previous point of view on the coupled vibration.

목차 Contents

• 제 1 장 서론...17
• 1-1. 연구배경...17
• 1-2. 연구목표 및 내용...18
• 제 2 장 비틀림 및 굽힘진동 기초이론...21
• 2-1. 다자유도계의 비틀림진동 방정식...21
• 2-2. 회전체의 굽힘진동...23
• 제 3 장 치차전동장치의 비틀림 및 굽힘진동...27
• 3-1. 시스템 구성 및 고유진동수 계산...27
• 3-2. 치차전동장치의 진동측정 실험 및 분석...31
• 3-2-1. 고유진동수 측정...35
• 3-2-2. 구동중의 회전기계 진동측정...52
• 3-2-3. 신호분석을 통한 치차의 상태진단...66
• 제 4 장 종진동 해석...77
• 4-1. 크랭크스로우의 종강성계수...77
• 4-1-1. 크랭크스로우의 종강성계수의 이론해석...78
• 4-1-2. 전체 크랭크축의 구속모멘트를 고려한 실제 크랭크축의 계산치와 실측치의 비교...87
• 4-2. 트러스트 베어링의 종강성계수...93
• 4-3. 크랭크스로우 반경력의 종방향 변환률...93
• 4-4. 크랭크축계 종진동의 계산예...97
• 제 5 장 종·비틀림 연성진동 해석...99
• 5-1. 크랭크축계 연성진동 방정식의 유도...100
• 5-1-1. 좌표의 설정과 질량 및 질량관성모멘트의 계산...101
• 5-2. 크랭크축계 연성진동 방정식의 해법...108
• 5-2-1. 자유진동 방정식의 해법...108
• 5-2-2. 강제 감쇠진동 방정식의 해법...110
• 5-3. 실제 크랭크축계의 계산예...118
• 5-3-1. 공시기관의 크랭크축계의 사양...118
• 5-3-2. 연성 자유진동 해석결과...119
• 5-3-3. 연성 강제진동의 해석결과...122
• 5-3-4. 고찰...125
• 제 6 장 결론...127
• 참고문헌...131