| Based on the concept of “functional integration”,the structural principle of a powergenerated magnetorheological energy absorber(PGMREA),which realizes the integration of a controllable damping mechanism and a power-generation mechanism,is proposed in this paper.The controllable damping mechanism is realized by an annular rotary gap filled with MR fluids that operates in the pure shear mode under controllable electromagnetic field.The rotary damping moment is transformed to a linear damping force via a movement conversion mechanism,which consists of a ball-screw mechanism and a rotor,based on the mechanical principle of the ball-screw.The power-generation mechanism is realized by a permanent magnet rotor and a stator with winding coils,which converts the vibration energy of the system into electric power or directly to power the controllable damping mechanism.Based on the structural principle of the PGMREA,the characteristics of the controllable damping force and the power-generated performance are theoretically analyzed.The magnetic circuit of PGMREA is analyzed and validated via a finite element simulation software package ANSYS.Then,the proposed PGMREA is experimentally tested on a servo-hydraulic testing machine(Type: LFH-LFV3068,SAGINOMIYA Inc.).The test results show that the PGMREA can provide 341-2260 N controllable damping force when the applied current is in the range of 0-1.0 A,and generate 0.069-4.434 W electric power when the displacement excitation velocity is in the range of 15.7-125.7 mm/s.Finally,the simulation model of a power-generated semiactive suspension based on PGMREA is built by the software package MATLAB/Simulink.The simulation results show that the vibration of the semi-active suspension can better be reduced with a controllable damping coefficient of 4000 N·s/m under a C-level road roughness input when the speed of vehicle is 30 km/h,and the generated power of the semi-active suspension system is about 17.47 W. |
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