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With the rapid development of aerospace technology, the vibration problem ofthe spacecraft flexible structure urgently needs to be solved. Magnetic fluidsare a type of multi-functional smart materials, which can be employed in shockabsorbers to eliminate these vibrations. Referring to the calculation methodsof stiffness coefficients of other passive dampers, the stiffness coefficientformula of magnetic fluid shock absorbers (MFSAs) was derived. Meanwhile, anovel stiffness adjustable magnetic fluid shock absorber (SA-MFSA) wasproposed. On the basis of the second-order buoyancy principle, a series ofSA-MFSAs were fabricated. The range of stiffness coefficients covered by theseSA-MFSAs contains the optimal stiffness coefficient estimated by formulas. Therepulsive force measurement and vibration attenuation experiments wereconducted on these SA-MFSAs. In the case of small amplitude, the relationshipbetween the repulsive force and the offset distance was linear. The simulationand experiment curves of repulsive forces were in good agreement. The resultsof vibration attenuation experiments demonstrated that the rod length and themagnetic fluid mass influence the damping efficiency of SA-MFSAs. In addition,these results verified that the SA-MFSA with the optimal stiffness coefficientperformed best. Therefore, the stiffness coefficient formula can guide thedesign of MFSAs.

Design of a stiffness adjustable magnetic fluid shock absorber based on optimal stiffness coefficient