一种磁性并联低刚度隔振器

为了能够抑制低频微幅振动,提出了一种磁性并联低刚度隔振器,其由固支的承载梁和磁性弹簧并联构成.其中,磁性弹簧由4个永磁体对组成,每个永磁体对中的两块永磁体相吸配置,并在梁上对称均布;利用等效电流法对永磁体进行建模,根据安培定律给出了永磁体之间磁力的计算表达式,最后通过曲线拟合得到了其近似表达式;分析讨论了梁的等效刚度计算方法,进而得到了所提出的隔振系统的等效刚度计算方法;在不考虑系统非线性影响时,对该隔振系统进行了隔振特性分析及数值仿真.结果表明:与传统的线性隔振器相比,该隔振器能够有效地隔离低频振动,降低隔振系统的固有频率,从而拓宽了隔振器的隔振频带,并改善了系统的阻尼特性,有效地降低了共振区域的共振峰值. 

A parallel magnetic low stiffness vibration isolator

In order to suppress the low frequency micro-vibration, a parallel magnetic low stiffness isolator consisting of the carrier beam with ends clamped and a magnetic spring was proposed.The magnetic spring was constructed by four permanent magnet pairs,furthermore, those magnets of each magnet pair were assigned in attractive interaction and symmetrically distributed on the surface of the beam. The equivalent current method was employed to establish the model of permanent magnet, and then the magnetic force calculation between two permanent magnets was developed according to Ampere''s force law. Finally, the approximate expression of the magnetic force was obtained by curve fitting. The calculation method of equivalent stiffness of the proposed isolation system was acquired based on the analysis of the equivalent stiffness of beam. By ignoring the nonlinear effects of the isolator, the isolation characteristic of the isolator was analyzed by numerical simulation. Results demonstrate that,compared with the traditional vibration isolator, the isolator discussed can effectively isolate the low frequency vibration of the structure. The natural frequency of the system can be reduced. It not only broadens the bandwidth of the isolator, but also improves the damping characteristics of the system; moreover, the peak of resonance is attenuated greatly.