The present investigation focused on the controllability and reliability of AC and DC electrorheological (ER) materials based adaptive beams. The mechanical and rheological reliability of such adaptive structures was studied over an extended time period. Modal vibration frequencies exhibited relatively stable behavior over time, while modal loss factors were observed to vary significantly. Significant structural stiffening in response to electric field was observed with the DC ER material, while damping dominated the changes observed with the AC ER material. Oscillatory shear experiments with the two materials provided insight into the cause of the observed differences between AC and DC material based structural response. At small strains both ER materials behaved in a nonlinear viscoelastic fashion. The relative contributions of nonlinear loss and storage moduli were found to cause the observed differences in the performance of these adaptive structures. The structural time response upon the application or removal of electric field was also studied. Both AC and DC structures responded rapidly to the application of electric field. For the case of electric field removal, however, it was found that the field strength and application time. ER material type. and structural excitation amplitude all influenced response time.
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References
1.
Boyle, F. P.1992. "Performance Characterization of ER Fluids: Durability': Proceedings of the International Conference on Electrorheological Fluidls, R. Tao, Ed., New Jersey: World Scientific Publishing Co., pp. 236-245.
2.
Choi, Y. , A. F. Sprecher, and H. Conrad. 1992. "Response of Electrorheological Fluid-Filled Laminate Composites to Forced Vibration", Journial af Intelligent Material Sys'temns a1n(Structures, 3:17-29.
3.
Coulter, J. P. . K. D. Weiss and J. D. Carlson. 1993a. "Engineering Applications of Electrorheological Materials'"Journal of Intelligent Material Sy.stems and Structures, 4:248-259.
4.
Coulter, J. P. , D. L. Don, M. Yalcintas and P. J. Biermann. 1993b. 'An Experimental Investigation of Electrorheological Material Adaptive Plates'" in Adaptive Structures anlad Material Syvstems, G. P. Carman and E. Garcia, eds., AD-Vol. 35, New York: The American Society of Mechanical Engineers, pp. 287-296.
5.
Coulter, J. P. , K. D. Weiss and J. D. Carlson. 1992. "Electrorheological Materials and Their Usage in Intelligent Material Systems and Structures, Part 11: Applications'"Reccnt Ad'ance1 s ini Atalptive andl Senlsorv Material.s and Their Applications, C. A. Rogers, R. C. Rogers, Eds., Lancaster, PA: Technomic Publishing Co., Inc., pp. 507-523.
6.
Don, D. L. 1993. An Inv'estigation oj'Electrorheological Material Adlaptive Structures, Masters thesis, Lehigh University, Bethlehem, Pennsylvania.
7.
Ehrgott, R. and S. Masri. 1992. 'Experimental Studies of Electro-Rheological Materials for Application in Adaptive Structures'"Proceedling.s of'thc 77Tirdl International Conlftrence on Adaiptive Structures, B. K. Wada, M. Natori and E. Breitbach, Eds., Lancaster, PA: Technoinic Publishing Co., Inc., pp. 161-175.
8.
Ferry, J. D.1980. Viscoela(stic Properties oa Polsinerls, N.Y.: John Wiley and Sons, Inc.
9.
Flanders, S. W. , L. I. Burke and M. Yalcintas. 1994. 'Alternate Neural Network Architectures for Beam Vibration Minimization", in Adlaptive Structurc.s atudl Comnposite Materials: Anal 'ysis and I Application, E. Garcia, H. Cudney. and A. Dasgupta, eds., AD-Vol. 45, MD-Vol. 45, New York: The American Society of Mechanical Engineers, pp. 293-298.
10.
Gainota. D. R. and F. E. Filisko. 1991a. "Linear/Non-Linear Mechanical Properties ot Electrorheological Materials'"Proceeling.s of the International Conf rence on Electrorheological Fluidis, R. Tao, Ed., New Jersey: World Scientific Publishing Co., pp. 246-263.
11.
Gamoto, D. R. and F. E. Filisko. 1991b. Dynamic Mechanical Studies of Electrorheological Materials: Moderate Frequencies'"Journal of Rheologs, 35(3):399-429.
12.
Gamoto. D. R. and F. E. Filisko. 1991c, "High Frequency Dynamic Mechanical Study of an AlunlinosiIicate Electrorheological Materials"'Jourial of Rhlologs.35(7):1411-1425.
13.
Gandhi. M. V. and B. S. Thoiipson. 1990. "Dynamically-Tunable Smart Structures Featuring Electro-Rheological Fluids", US.-Japani Workshop o0 Snart ll Intelliglent Materials a(ul Ss.stemo.s, I. Ahniad, A. Crowson, C. A. Rogers and M. Ailawa, Eds.. Lancaster. PA: Technomic Publishing Co.. Inc. pp. 317-326.
14.
Gandhi. M. V. and B. S. Thompson. 1989. Dynamically-Tunable Smart Composites Featuring Electro-Rheological Fluids", in Fiber Optic Smart Structures an(1 Skin.s I1, E. Udd Ed. Boston, MA: SPIE-The International Socieiy for Optical Engineering. 1170:294-304.
15.
Gandhi. M V. and B. S. Thompson. 1988. "A New Generation of Revo-4Iniontary Ultrat-Advanced Intelligent Composites Materials Featuring Electro-Rheological Fluids', in Sinart Materials, Structures, anid Mathei(iotio(l Issues, C. A. Rogers Ed.. Lancaster. PA: Technomic Publishing Co.. Inc.. pp. 63-68.
16.
Gong. H.l. M. King and T. B. Cher. 1993. Influence of a Locally Applied Electro-Rheologiclal Fluid Layer on Vibration of a Simple Cantilevei Beam". Journal of! Intelligeint Material Ss.stenios anl Structures, 4:379-384.
17.
Han. I. . A. Voloshin, M. Yalcintas and J. P. Coulter. 1994. "Electrorheoslogical Adaptive Structures with Embedded Sensing and Cont lrPro ce d(his of the SPIE, Sninrt Stuc(ture.s anl Iuitelligent Ss.stemn.s, N. W. Hagood. Ed. 2190:2-12.
18.
Hill. J. C. . N. A. Va,, D. J. Klingenberg and C. F. Zukoski. 1992. "Experimental and Theoretical Response Times of Electrorheological Fluids", Proceedings of the International Conpfrence on Electrorheological Fluids, R. Tao, Ed., New Jersey: World Scientific Publishing Co., pp. 280-288.
19.
Hill, J. C. and T. H. Van Steenkiste. 1991. "Response Times of Electrorheological Fluids", Journal of Applied Phyisics, 70(3):1207-1211.
20.
Hosseini-Sianaki, A. , W. A. Bullough, R. Firoozian, J. Makin and R. C.Tozer. 1992. "Experimental Measurements of the Dynamic Torque Response of an Electro-Rheological Fluid in the Shear Mode"!Proceeding.s of the International Conference on Electrorheological Fluids, R. Tao, Ed., New Jersey: World Scientific Publishing Co., pp. 219-235.
21.
Johnson, A. R. , J. Makin, W. A. Bullough, R. Firoozian and A. Hosseini-Sianaki. 1993. "Fluid Durability in a High Speed Electro-Rheological Clutch", Journal of Intelligent Material Ss.stems and Structures, 4: 527-532.
22.
Jordan, T. C. , M. T. Shaw and T. C. B. McLeish. 1992. "Viscoelastic Response of Electrorheological Fluids., II. Field Strength and Strain Dependence", Journal of Rheology, 36(3):441-463.
23.
Shiang, A. H. and J. P. Coulter. 1994. "Controllablity and Reliability Issues Related to Electrorheological Material Adaptive Structures", Proceedings of the Second International Conference on Intelligent Materials, C. A. Rogers, G. G. Wallace, Eds.. Lancaster, PA: Technomic Publishing Co., Inc., pp. 1117-1130.
24.
Sperling, L. H.1992. Introduction to Phs.sical Polyner Sience, N.Y.: John Wiley & Sons.
25.
Tanaka, K. , T. Yoshida and K. Kovama. 1992. "Transient Response of ER Fluids", Proceedings of thc Interna(ition(al C(onlc'cn1(1 c1 o lI('ctrorhcological Fluids, R. Tao. Ed.. New Jersev World Scientific Publishing Co.. pp. 289-299.
26.
Tschoegl, N. W.1989. The Phenomenological Theory of Linear Vi.vcoela.stic Behavior. Ani Introduction, Berlin: Springer-Verlag.
27.
Weiss, K. D. , J. D. Carlson and J. P. Coulter. 1993. 'Material Aspects of Electrorheological Systems': Journal oflt'itelliiget Material Systems and Structures, 4:13-34.
28.
Weiss, K. D. , J. P. Coulter and J. D. Carlson. 1992. 'Electrorheological Materials and Their Usage in Intelligent Material Systems and Structures. Part I: Mechanisms, Formulations and Properties". Recent Advances in Adaptive and Seisors'N, Materials and Tiehir Applications, C. A. Rogers, R. C. Rogers, Eds.. Lancaster. PA: Technomic Publishing Co.. Inc., pp. 605-621.
29.
Wereley, N. M. 1994. 'Active Damping of Flexible Rotor Blades Using ER Fluid Based Actuators", Proceeding.s of the SPIE, Smart Structures and Intelligent SYstei.s, N. W. Hagood, Ed.. 2190:13-18.
30.
Winslow, W. M.1949. "Induced Fibration of Suspensions", Journal o?'f Applied Ph .ysics, 20(12):1137-1140.
31.
Yalcintas, M. , J. P. Coulter and D. L. Don. 1995. "Structural Modeling and Optimal Control of Electrorheological Material Based Adaptive Beams': Journal of Sniart Material.s and Structures, 4:207-214.
32.
Yalcintas, M. and J. P. Couter. 1995. 'Analytical Modeling of Electrorheological Material Based Adaptive Beams'; Journal of Intelliigent Material So'.steni.s and Structures., 6(4):488-497.
