This study proposes to incorporate magnetic nonlinearity into the linear magnetorheological elastomer (MRE) absorber, aiming at further broadening its operating bandwidth under each constant current. The test results under different amplitudes show that the absorber performs nonlinearity and its effective frequency bandwidth will be enlarged when it works on nonlinear mode. Then the adaptability for the linear case and the nonlinear case were both verified and evaluated. Afterwards, the absorption effectiveness of this nonlinear MRE absorber on vibration control was experimentally carried out. The vibration absorption evaluation also demonstrates that the nonlinear working mode absorber has larger effective bandwidth. And finally a short-time Fourier transform was used to control the nonlinear MRE absorber to track the excitation frequency variation. The test result demonstrates that the hybrid MRE absorber can also tune its stiffness to trace the excitation frequency and performs better than passive absorbers.

Chapter Contents:

• 13.1 Structure, working principle, and analyses of the MRE absorber
• 13.1.1 Structure
• 13.1.2 Working principle
• 13.1.3 Analysis of the MRE absorber
• 13.2 Experiment test of the hybrid MRE absorber
• 13.2.1 Experiment setup
• 13.2.2 Testing result
• 13.2.2.1 Nonlinearity verification
• 13.2.2.2 Adaptability verification
• 13.3 Vibration reduction evaluation
• 13.3.1 Performance of the MRE absorber under different amplitudes
• 13.3.2 The performance comparison between passive absorber and controlled absorber
• 13.4 Conclusion
• References

Inspec keywords: nonlinear control systems; elastomers; shock absorbers; magnetorheology; Fourier transforms; vibration control

Other keywords: excitation frequency variation; magnetorheological elastomers; hybrid nonlinear vibration absorber; stiffness; nonlinear working mode absorber; vibration control; vibration absorption; MR elastomers; absorption effectiveness; frequency bandwidth; constant current; short-time Fourier transform; operating bandwidth; magnetic nonlinearity; linear MRE absorber

Subjects: Vibrations and shock waves (mechanical engineering); Mathematical analysis; Integral transforms; Nonlinear control systems; Mechanical variables control; Mechanical components, systems and devices; Engineering materials