论文标题
基于最佳刚度系数的刚度可调节磁性流体减震器的设计
Design of a stiffness adjustable magnetic fluid shock absorber based on optimal stiffness coefficient
论文作者
论文摘要
随着航空航天技术的快速发展，需要解决航天器柔性结构的振动问题。磁性流体是一种多功能智能材料，可用于减震器以消除这些振动。指的是其他被动阻尼器的刚度系数的计算方法，得出了磁性流体减震器（MFSA）的刚度系数。同时，提出了一种新型的可调节磁性流体减震器（SA-MFSA）。根据二阶浮力原则，制造了一系列SA-MFSA。这些SA-MFSA覆盖的刚度系数的范围包含公式估计的最佳刚度系数。在这些SA-MFSA上进行了排斥力测量和振动衰减实验。在小幅度的情况下，排斥力与偏移距离之间的关系是线性的。排斥力的模拟和实验曲线非常同意。振动衰减实验的结果表明，杆的长度和磁性流体质量会影响SA-MFSA的阻尼效率。此外，这些结果证实了具有最佳刚度系数的SA-MFSA表现最好。因此，刚度系数公式可以指导MFSA的设计。
With the rapid development of aerospace technology, the vibration problem of the spacecraft flexible structure urgently needs to be solved. Magnetic fluids are a type of multi-functional smart materials, which can be employed in shock absorbers to eliminate these vibrations. Referring to the calculation methods of stiffness coefficients of other passive dampers, the stiffness coefficient formula of magnetic fluid shock absorbers (MFSAs) was derived. Meanwhile, a novel stiffness adjustable magnetic fluid shock absorber (SA-MFSA) was proposed. On the basis of the second-order buoyancy principle, a series of SA-MFSAs were fabricated. The range of stiffness coefficients covered by these SA-MFSAs contains the optimal stiffness coefficient estimated by formulas. The repulsive force measurement and vibration attenuation experiments were conducted on these SA-MFSAs. In the case of small amplitude, the relationship between the repulsive force and the offset distance was linear. The simulation and experiment curves of repulsive forces were in good agreement. The results of vibration attenuation experiments demonstrated that the rod length and the magnetic fluid mass influence the damping efficiency of SA-MFSAs. In addition, these results verified that the SA-MFSA with the optimal stiffness coefficient performed best. Therefore, the stiffness coefficient formula can guide the design of MFSAs.
