Vol. 22 No. 324 Aug JOU RNAL OF EXPERIMEN TAL MECHANICS : (2007) 03 & : O34 ; X593 : A. , Tewanim [3 6 ], [12 ] 1.

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1 JOU RNAL OF EXPERIMEN TAL MECHANICS Vol. 22 No. 324 Aug : (2007) 03 & ,,,, (,, ) :,,,,,,,, 25dB : ; ; ; : O34 ; X593 : A [1 ], ( ),,,,,,,,,,,,,,,, Tewanim, [ 2 ] [3 6 ],,,,,,,, [ 7 ] [8 ] [9 ], [10 ] [11 ] [12 ],, (A TVA),, , 2 1,2 3 : : ; ( ) ; ( ) : ( ),,, E2mail : edu. cn

2 430 (2007 ) 22,3,4,5,6,7,8,9,10,11,12,13,,,,,, f = 1 GA 2 hm f ; G ; A ; h ; m [13 ],, (1),,,,,, (1) 2 1 Fig. 2 Photograph of the developed A TVA Fig. 1 Schematic diagram of the developed A TVA 1. 2, 3,,,,,, : J ZK210, ; 3 YE5858A ; Fig. 3 The evaluation system for frequency2shift property PCB M353B18 ; Signal Calc ACE 4,,,,,

3 324 : 431, 4 5,,, 0A 1A, 24 Hz 50 Hz, 26 Hz, 1A,, 50 Hz 4 Fig. 4 The transfer function versus exciting frequency 5 Fig. 5 The relationship between resonance f requency and applied current 2,,,,,,,,,,,,,, ;,,,,, [14 ] 6 Fig. 6 The control system of A TVA,,, ,,,,, 4N IC2C K2HL, RS232,

4 432 (2007 ) 22 U SB7325B,,,, FIFO 2. 2,,, 7, 7 (a), 7 (b) 7 Fig. 7 The flow chart of genetic algorithms,,,,,,, , 1 : 1 Tab. 1 Input parameters of genetic algorithms in control system Hz,, 2i (i ) (10 ),,,,, 3 (48 ),,, 9

5 324 : 433,,,,, 50 Hz, 25dB, Hz Fig. 8 search progress when exciting f requency is 46 Hz 9 Fig. 9 The vibration attenuation of absorbers 3,,,,, 25dB : [1 ] Frahm H. Device for damping vibrations of bodies : United States, [ P] [2 ] Tewanim S G, Walcott B L, Rouch K E. Active optimal vibration control using dynamic absorber [ C ]. IEEE International Conference on Robotics and Automation, 1991, 2 : [3 ] Margolis M. Retrofitting active control into passive vibration isolation systems [J ]. Journal of Vibration and Acoustics2Transactions of the ASME, 1998, 120 : [ 4 ] Filipovic D, Schroder D. Vibration absorption with linear active resonators : continuous and discrete time design and analysis[j ]. Journal of Vibration and Control, 1999, 5 : [5 ] J alili N, Olgac N. A sensitivity study of optimum delayed feedback vibration absorber [ J ]. Journal of Dynamic Systems, Measurement & Control2Transactions of the ASME, 2000, 121 : [6 ] Seung B C, Sung R H. Active vibration control of a flexible structure using an inertial type piezoelectric mount [J ]. Smart Materials and Structures, 2007, 16 : [7 ],,,. [J ]., 2005, 20 (4) : (L I Jianfeng, GON G Xinglong, ZHAN G Xianzhou, et al. Study of adaptive tuned vibration absorber and its dynamic properties. Journal of Experiment Mechanics, 2005, 20 (4) : (in Chinese) ) [8 ],. [J ]., 1999, 18 (2) : (L I Minxia, L IU Ji. Study on stability of the vibtation control system with variable2stiff ness structure. Journal of Vibration And Shork, 1999, 18 (2) : (in Chinese) ) [9 ],,. [J ]., 2006, 25 (3) : ( SUN Zhizhuo, WAN G Quanjuan, WAN G Fushan. Study and design of an active electro2magnetic dynamic vibration absorber. Journal of Vibration And Shork, 2006, 25 (3) : (in Chinese) ) [10 ] Davis C L, Lesieutre G A. An actively tuned solid2state vibration absorber using capacitive shunting of

6 434 (2007 ) 22 piezoelectric stiffness[j ]. Journal of Sound and Vibration, 2000, 232 (3) : [11 ] Williams K A, Chiu G T C, Bernhard R J. Dynamic modelling of a shape memory alloy adaptive tuned vibration absorber[j ]. Journal of Sound and Vibration, 2005, 280 : [12 ] DEN G Huaxia, GON G Xinglong, WAN G Lianhua. Development of an adaptive tuned vibration absorber with magnetorheological elastomer[j ]. Smart Materials and Structures, 2006, 15 : N111 N116. [13 ] Shiga T, Okada A, Kurauchi T. Magnet2roviscoelastic behavior of composite gels[j ]. Journal of Applied Polymer Science, 1995, 58 (4) : [14 ],,. [J ]., 2000, 34 (5) : ( GAO Feng, SH EN Yapeng, L I L uxian. Vibration absorber design for reducing structural sound level using genetic algorithms. Journal of Xi an Jiaotong University, 2000, 34 (5) : (in Chinese) ) Adaptive Tuned Vibration Absorber Based on Magnetorheological Elastomers and its Optimal Control WAN G Lian2hua, GON G Xing2long, D EN G Hua2xia, N I Zhen2chao, KON G Qing2he ( CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Mechanics and Mechanical Engineering, University of Science and Technology of China, Hefei , China) Abstract : A king of adaptive t uned vibratio n absorber ( A TVA ) based o n magnetorheological elasto mer s ( M R E) is p resented. M R E has co nt rollable shear modulus when it is expo sed to an external magnetic field. It is used as a co nt rollable elastic and damping element here. When t he applied current is changed, the magnetic field t hrough MRE will change, then the resonance f requency of t he A TVA will shif t. In order to co nt rol t his kind of shift op timally, t he genetic algorit hms is improved, and migrated into the A TVA. Experiment result s show t hat this kind of genetic algorit hms has characteristics of glo bal search and rapid co nvergence. It makes A TVA to find t he best working ability quickly. Furthermore, t he developed A TVA has good vibration absorption capacity in whole working frequency scale. When the mass ratio between A TVA and primary system is 5 : 8, it s best attenuation can reach 25dB. Keywords : magnetorheological elasto mer s ( M R E) ; dynamic vibratio n absorber ; vibratio n co nt rol ; genetic algorit hms