Design, Preparation and Dynamic Response of a Composite Magnetorheological Elastomer-Based Intelligent Dynamic Vibration Absorber
摘要
Conventional dynamic vibration absorbers face critical limitations in bandwidth and adaptability, particularly under variable excitation or stringent operational demands.
ObjectiveTo cope with vibration systems under variable or complex load conditions, it is necessary to design an intelligent dynamic vibration absorber with superior performance.
MethodsThis study leverages the magnetic field-dependent properties of magnetorheological components to design and fabricate a compact dynamic vibration absorber with tunable stiffness. The dynamic mechanical performance of the absorber was systematically evaluated using a universal testing machine and vibration exciter. Subsequent vibration control efficacy tests were conducted on a laboratory-scale scaled-down shaft system.
ResultsThe dynamic vibration absorber exhibits a wide range of adjustability. When the current in the dynamic vibration absorber coil increases, the equivalent stiffness of the magnetorheological elastomer(MRE) elevates while the damping initially augments then attenuates; increased excitation amplitude leads to reduced stiffness and diminished damping; enhanced excitation frequency results in elevated stiffness but decreased damping. Adjusting the current enables effective modification of the vibration attenuation band.
ConclusionsThis study designs and validates a compact MRE-based vibration absorber suitable for engineering applications. By combining quasi-static and frequency-domain testing, the material properties were systematically analyzed with respect to variations in current, excitation frequency, and amplitude.