臺灣博碩士論文加值系統

磁流變液(Magnetorheological Fluid)簡稱MRF是由可極化的固體顆粒分散在絕緣溶劑中形成的懸浮液。在外加磁場的作用下，其內部結構和黏滯性質會發生顯著的變化。由於該過程迅速(毫秒量級)、可逆、易於控制且連續可調，因而在工業、科技和國防等領域有廣泛的應用前景。本文即利用磁流變阻尼器阻尼係數可藉磁場改變調整的特性，將其應用於汽車前端的保險桿內，並透過主動調整阻尼比來達到低速碰撞時，車體等減速度前進，減低車體損害及降低車內乘員因為碰撞而造成的損傷。數值模擬分析的結果顯示，具磁流變液阻尼器的保險桿確實能夠有效降低碰撞時的最大減速度。在雙自由度CRASH碰撞模式下，裝有10cm緩衝行程的磁流變液保險桿（MR Bumper）可將車體不變形的最大碰撞初速由8 Km/h提升至12.5 Km/h，約改良56%，本文並就雙自由度SMAC碰撞模式之五大參數，即車體自然頻率、保險桿阻尼比、車體與保險桿剛性比、阻尼器有效衝程及車體碰撞初速做分析討論，提供設計準則。

Magnetorheological Fluid (MRF) is a suspension fluid formed by scattering polarizable solid granule in isolated solvents. Under the influence of outside magnetic field, its inner structure and viscosity properties have a remarkable change. As the process is dramatically speedy (in the measurement of milliseconds), reversible, easily controllable and continuously adjustable, its applications in comprehensive fields such as industry, high technology and military defense have a very bright outlook. Since the damping coefficient of MRF damper can be changed and adjusted through magnetic field, this property can be utilized in the car’s front end bumper and when the damping ratio is adjusted in an active way so that the car body would decelerate to progress after low-speed collision to reduce damage to the car body and injury to the passenger. Results of numeric simulation analyses show the bumper with MRF damper can indeed effectively decrease the maximum deceleration during collision. Under the two-degree-of-freedom CRASH collision model, MR bumper having a buffer distance of 10cm could boost the initial maximum collision speed which makes the car body undistorted from 8 Km/h to 12.5 Km/h, or roughly improving 56%. This thesis also discusses and analyzes five main parameters of the two-degree-of-freedom SMAC collision model：car body natural frequency, bumper damping ratio, stiffness ratio of car body and bumper, effective damper stroke and initial car body collision velocity , to provide the design criteria for a MRF bumper.

第一章 緒論1
1.1 前言1
1.2 磁流便流體簡介 1
1.3 汽車保險桿設計沿革7
1.4 文獻回顧15
1.5 研究動機19
1.6 本文簡介20
第二章 汽車碰撞運動分析22
2.1 汽車碰撞運動類型22
2.2 車損與人傷間的關聯26
2.3 汽車碰撞模擬軟體CRASH與SMAC理論分析35
2.4 單自由度車體模型41
2.5 雙自由度車體模型47
第三章 結果與討論54
3.1 單自由度車體碰撞模型數值分析54
3.2 雙自由度車體碰撞模型數值分析81
第四章 結論與建議89
4.1 結論89
4.2 未來展望90
參考文獻91

1.阮呂創義,“汽車原理, ”文京圖書公司,1988
2.王代華,“磁流變（MR）液的特性與應用研究綜述,”第二屆全國電磁流
變學術會議,pp.25,1998.
3.J.D.Carlson,D.M.Catanzarite and K.A.St.Clair,“Commercial
Magneto-Rheological Fluid Devices,”International J. of
Modern Phys. B,Vol. 10,Nos.23?(1996) 2857-2865
4.Anthony J. Yanik,“The first 100 years of transportation
safety:part2,”Automotive Engineering,February 1996 59-64
5.Michael Sedgwick,“Cars of the fifties and sixties,”Crescent
Books
6.David J. King,Gunter P. Siegmund, and Mark N. Bailey,
“Automobile Bumper Behavior in Low-Speed Impacts,”SAE paper
930211,1993.
7.Exxon Corporation, 1992.
8.Jack Erjavec and Robert Scharff,“Automotive Technology─ A
system approach,”Delmar Publishers Inc.,1014-1015
9.Darin Evans,“Consistency of Thermoplastic Bumper Beam Impact
Performance,”SAE paper 980113,1998.
10.Rabinow J., “The Magnetic Fluid Clutch, ”Electric
Engineering,1948, Vol.67, pp.417-431.
11.R. E. Rosensweig, R. Kaiser and G. Miskolczy,“Viscosity of
Magnetic Fluid in a Magnetic Field, ”J. Colloid and
Interface Sci. 29, 4(1969).
12.Z. P. Shulman, V. I. Kordonsky, E. A. Zaltsgendler, I. V.
Prokhorov, B. M. Khusid and S. A. Demchuk,
“Structure,Physical Properties and Dynamics of
Magnetorheological Suspensions, ”Int. J. Multiphase Flow
Vol. 12, No. 6, pp. 935-955, 1986.
13.Katsuto Nakatsuka, Hidekichi Yokoyama, Junzo Shimoiizaka and
Takashi Funaki, “Damper Application of Magnetic Fluid For a
Vibration Isolating Table, ”J. Magn. Magn. Mater., Vol. 65,
359-362, 1987.
14.V. I. Kordonsky, Z. P. Shulman, S.R. Gorodkin, S.A. Demchuk,
I. V. Prokhorov, E. A. Zaltsgendler and B. M. Khusid,
“Physical Properties of Magnetizable Structure-Reversible
Media, ”J. Magn. Magn. Mater., Vol. 85, 114-120,1990.
15.Hugh Aldersey-Williams,“A Solid Future for Smart Fluids, ”
New Scientist, Vol. 17, 37-40, 1990.
16.W. I. Kordonsky, S. P. Gorodkin and S. A. Demchuk,
“Magnetorheological Control of Heat Transfer, ”2783-2788,
1991.
17.W. I. Kordonsky,“Elements and Devices Based on
Magnetorheological Effect, ”Journal of Intelligent Material
Sustems and Structures, Vol. 4, 65-69, 1993.
18.W. I. Kordonsky, “Magnetorheological Effect as a Base of
New Devices and Technologies, ”J. Magn. Magn. Mater., Vol.
122, 395-398, 1993.
19.K.Nakatsuka,“Trends of magnetic fluid applications in
Japan, ”J. Magn. Magn. Mater., Vol. 122,387-394,1993.
20.Keith D. Weiss, J. David Carlson and Donald A. Nixon,
“Viscoelastic Droperties of Maneto- and Electro- Rheological
Fluids, ”Journal of Intelligent Material Systems and
Structures, Vol. 5, 772-775, 1994.
21.J.David Carlson and Keith D. Weiss,“A growing attraction to
magnetic fluids,”Machine Design,August 1994 61-64
22.B. F. Spencer Jr., S.J. Dyke, M.K. Sain and J.D.Carlson,
“Phenomenological Model of a Magnetorheological Damper, ”
ASCE Journal of Engineering Mechanics, March 10, 1996.
23.Toyohisa Fujita, Yasuhisa Wada, Goro Obinata, Yoichi
Akagami, Shinzo Nishimura and Yuzi Ogasawara,“Comparison of
Frequency Characteristics in a Damper Using Magnetic Fluid,
ER Fluid Dispersing Smectite and Mixed ER Magnetic Fluid, ”
Int. J. Modern Phy. B, Vol. 10, Nos. 2324 (1996) 3001-3010.
24.Osama Ashour, Craig A. Rogers and W. I. Kordonsky,
“Magnetorheological Fluids: Materials, Characterization, and
Devices, ”Journal of Intelligent Material systems and
Structures, Vol. 7, 123-130, 1996.
25.C. S. Yeh and K. C. Chen,“A Thermodynamic Model for
Magnetorheological Fluids, ”Continuum Mech. Thermodyn., 9
(1997), 273-291.
26.J. David Carlson and B. F. Spencer Jr., “Magnetorheological
Fluid Dampers for Seismic Hazard Mitigation, ”International
Conference on ERF, MRS and Their Applications, 22-25, 1997.
27.Mark R. Jolly, Jonathan W. Bender, and J. David Carlson,
“Properties and Applications of Commercial
Magnetorheological Fluids, ”SPIE 5th Annual Int. symposium
on smart Structures and Materials, Vol. 15, 1998.
28.卜遠程, “磁流變流體之機械性質與消能機制的探討, ”博士論文,國
立台灣大學應用力學研究所, 1998.
29.Richard I. Emori, “Analytical Approach to Automobile
Collisions, ”SAE paper 680016, 1968.
30.Kenneth. L. Campbell, “Energy Basis for Collision
Severity, ”SAE paper 740565, 1974.
31.Raymond M. Brach,“Energy Loss in Vehicle Collisions, ”SAE
papper 871993, 1987.
32.Gustav A.Nystrom,Garrison Kost,and Stephen M. Werner,
“Stiffness Parameters for Vehicle Collision Analysis,”SAE
paper 910119,1991.
33.Tadanori Azuma, Hirotetsu Motobu and Koji Yoshioka,“A study
on a New Type of Isolator for Shock and Vibration Based on a
Swinging Motion Mechanism-Part 2: New Bumper System,”SAE
paper 921593, 1992.
34.P. K. Dellock and T. A. Sweder,“A New 5MPH Bumper System, ”
SAE paper 942277, 1994.
35.Helcio Onusic,Jose Augusto P Campos and Paulo Sergio P dos
Santos,“Considerations Concerning Vehicle Collisions Through
Simplified Calculations of the Impact Forces,”SAE paper
962324,1996.
36.Malcolm C.Robbins,“Lack of Relationship Between Vehicle
Damage and Occupant Injury,”SAE paper 970494,1997.
37.I.U.Ojalvo and E.C. Cohen,“An Efficient Model for Low Speed
Impact of Vehicles,”SAE paper 970779,1997.
38.Automotor and sport, “堅如磐石─BMW 3系列撞擊測試, ” CAM汽
車鑑賞, April 4, 1999.
39.Anthony J. Yanik,“The first 100 years of transportation
safety:part1,”Automotive Engineering,January 1996 33-37
40.P. A. Goater,“Safety─the way ahead, ”ImechE paper 925202,
1992.
41.R. J. Donohue, R. L. Lefevre, L. D. Watkins,“International
Harmonization of Motor Vehicle Safety Regulations, ”ImechE
paper 925200, 1992.
42.E. Faerber, B. Friedel, K-P Glaeser, “Development of the
European Proposed Regulation for Side Impact Performance, ”
ImechE paper 925203, 1992.
43.R. R. Mc Henry, I. S. Jones, and J. P. Lynch, “Mathematical
Reconstruction of Highway Accidents Scene Measurement and
Data Processing System, ”Calspan technical report ZQ-5341-V-
2, 1975.
44.Engineering Dynamics Corporation,“EDSMAC Version 1.0, ”
1985.
45.Suresh B. Kudallur, Gary H. Conners, and Keith W.
Buffinton, “Damping and Stiffness Control in a Mount
Structure Using Electrorheological (ER) Fluid, ”FED-
Vol.205/AMD-Vol.190, Developments in Electrorheological Flows
and Measurement Uncertainty, ASME 1994.