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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.
In order to suppress low-frequency micro-amplitude vibration, a magnetic parallel low stiffness isolator is proposed, which consists of a fixed support beam and a magnetic spring, wherein the magnetic spring consists of four pairs of permanent magnets, each pair of permanent magnets The two permanent magnets are attracted and symmetrically arranged on the beam. The permanent magnet is modeled by the equivalent current method. According to the ampere law, the calculation formula of the magnetic force between the permanent magnets is given. Finally, The approximate expression of the vibration isolation system is obtained. The calculation method of the equivalent stiffness of the beam is analyzed and the equivalent stiffness calculation method of the vibration isolation system is proposed. When the system nonlinearity is not considered, the vibration isolation system The results show that compared with the traditional linear vibration isolator, the vibration isolator can effectively isolate the low frequency vibration and reduce the natural frequency of the vibration isolating system, so as to widen the vibration isolation of the vibration isolator Frequency band, and improve the damping characteristics of the system, effectively reducing the resonance peak resonance.