Noise and Vibration Analysis for Wheel/Rail Interaction
- 주제(키워드) Noise and vibration analysis
- 발행기관 고려대학교 대학원
- 지도교수 강영종
- 발행년도 2012
- 학위수여년월 2012. 2
- 학위구분 박사
- 학과 일반대학원 건축·사회환경공학과
- 원문페이지 116 p
- 실제URI http://www.dcollection.net/handler/korea/000000033585
- 본문언어 영어
- 제출원본 000045695604
초록/요약
According to increase of the interest about environmental problem nowadays, social requirements about environmental friendliness rapidly increase in the railway. Along with changes, these have increased such as the civil complaint, conflict and enforcement of environmental standard. However, the noise and vibration research in the railway is significantly inadequate in Korea. Therefore, development of the railway noise and vibration core technology is needed. Moreover, in recent years, a number of researches about the dynamic characteristics of the noise and vibration in the railway have been performed. As a result, as the high frequency vibration which occurs in the irregularity of the wheel and rail running surfaces causes the track noise in railway system, the noise and vibration analytic studies with measurement for the wheel and rail is needed. Theoretical models describing the interaction between the wheel and track are used for noise and vibration analysis. The high frequency vibration analysis model is as follows. An infinite homogeneous structure consisting of double beams continuously supported by elastic layers is a common model for this kind of track. The upper beam describes the rail, the lower one models the concrete slab, while the two elastic layers reflect the properties of the rail-pad and the track sub-grade. The wheel is modeled as two masses model. The contact spring stiffness (kH), damping (c1) and stiffness (k1) of the rail-pad among these wheel and track properties are particularly very important to dynamic analysis model. This Analysis Models that have been developed for wheel/rail noise and vibration are generally linear in order to make use of a frequency-domain approach. In fact, the local elasticity between the wheel and the rail exhibits a nonlinear stiffness behavior due to geometrical effects. Also, when most of the researches for the noise and vibration analysis of the wheel/rail interaction are performed, the hysteretic damping to reflect the damping coefficient is considered. However, characteristics of the hysteretic and viscous damping are a little different. Therefore, the noise and vibration analysis for the wheel/rail interaction using the nonlinear contact spring and viscous damping are performed and analyzed in this study. Using that developed program, analytical studies on the concrete slab and ballast track were performed and evaluated in this study. This is able to provide especially the analysis tool and technique for noise/vibration guidelines on the design. To obtain the same results between the analysis and measurement, the noise and vibration studies for the railway structure should be continuously for the further study
more목차
1. Introduction
1.1 Overview
1.2 Object and scope
2. Literature review
3. Background of noise and vibration analysis for wheel/rail interaction
3.1 Introduction
3.2 Basic theory
3.3 Noise and vibration analysis model
3.3.1 Track model
3.3.2 Train model
3.3.3 Track irregularity
3.3.4 Contact (Hertzian) spring
3.3.4.1 Herzian constant (cH)
3.3.4.2 Nonlinear analysis algorism (Newton-Raphson method)
4. Development of noise and vibration analysis program for wheel/rail
4.1 Introduction
4.2 Wheel/rail interaction generation
4.3 Admittance of wheel
4.4 Admittance of rail
4.5 Noise and vibration analysis program for wheel/rail
5. Numerical examples and verification
5.1 Introduction
5.2 Linearized Hertzian spring
5.3 Comparison of linearized and nonlinear contact (Hertzian) spring
6. Parametric studies
6.1 Introduction
6.2 Effect of linearized Hertzian contact spring
6.3 Effect of viscous damping of rail-pad
6.4 Effect of stiffness of rail-pad
7. Conclusions
References
Acknowledgments
