자기유변탄성체를 이용한 차량 축부재의 동특성 분석 및 능동진동제어 연구

Title
자기유변탄성체를 이용한 차량 축부재의 동특성 분석 및 능동진동제어 연구
Authors
박정헌
Keywords
자기유변탄성체를이용한차량축부재의동특성분석및능동진동제어연구
Issue Date
2012
Publisher
인하대학교
Abstract
This paper presents a solution of the vibration reduction in the propeller shafts by MR elastomer. Generally, the vibration mode in propeller shafts can be divided into the bending and torsional vibrations. And the bending vibration is significant factor when it excites with the resonance frequencies in the propeller shafts. However, since the torsional vibration is also the critical source of vibration problem in the propeller shaft, it is necessary to analyze bending and torsion vibration together with the natural frequencies. In this paper, active vibration control system of propeller shafts is introduced to actively absorb the combined bending and torsional vibrations. Proposed active damping structure is built by embedding the Magnetorheological(MR) elastomers whose elastic modulus is controllable by an applied magnetic field. MR elastomers consist of natural or synthetic rubber filled with micron-sized magnetizable particles. Therefore the stiffness can be changed variously according to the magnetic flux density. By using this property, the material can be applied to vibration absorber used in many parts of structures. However, the performance of MR elastomer on vibration reduction is various depending on different magnetically polarization direction and dimension during the manufacturing process. In this paper, a series test using MR elastomers with different types and dimensions are conducted. The extent of natural frequency shifted against magnetic field at various excitation frequencies can be measured. For the desired vibration damping performance of a shaft, the tests of MR elastomers as different direction, thickness are analyzed. For reduction of automotive vibration, dynamic damper of propeller shaft is designed by using MR elastomer and equipped in the propeller shaft. Finally, control results are shown through the experiments to confirm the effect of MR elastomer dynamic damper for automotive vibration reduction.
Description
Chapter 1 Introduction 1 1.1 Research Backgrounds and Objectives 1 1.2 Outline of Dissertation 3 Chapter 2 Magneto-Rheological Elastomer 4 2.1 MR Elastomer 4 2.2 Research of MR Elastomers 5 2.3 Manufacturing MR Elastomer 6 Chapter 3 MR Elastomer Vibration Experiments 12 3.1 Experimental Device Configuration 12 3.2 Mathematical Modeling of Vibration Test 13 3.3 Experimental Results of MR Elastomer 15 Chapter 4 Dynamic Damper with MR Elastomer 28 4.1 The Dynamic Absorber 28 4.2 Design of Dynamic Damper 30 Chapter 5 Automotive Propeller Shaft Experiments 38 5.1 Modal Test 38 5.2 Control Result 39 Chapter 6 Conclusions 52 Reference 54 Table 3.1 Resonance Frequency for MR Elastomers 18 Table 3.2 Resonance Frequency Shift for MR Elastomers 19 Table 5.1 Natural frequency of the Shafts 41 Figure 2-1 Molding box for Manufacturing MR Elastomers 8 Figure 2-2 Schematic Model of Magnetorheological Elastomer Samples 9 Figure 2-3 Molding box with Magnet for Culture Process 10 Figure 2-4
URI
http://dspace.inha.ac.kr/handle/10505/23328
Appears in Collections:
College of Engineering(공과대학) > Mechanical Engineering(기계공학) > Theses(기계공학 석박사 학위논문)
Files in This Item:
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