基于磁流变弹性体基础隔振的电力变压器可控减振研究

Research on Controllable Vibration Reduction of Power Transformer with Magnetorheological Elastic Foundation

电力变压器运行时会产生振动,不仅会产生噪声影响居民的日常生活,严重的还会降低电力设备的使用寿命危害电网安全。本文采用新型减振材料磁流变弹性体作为电力变压器基础隔振,利用磁流变弹性体刚度可调特性实现三段减振模式,实现应用于电力变压器的可控减振系统,进一步建立系统仿真模型,分别在谐波、冲击性和随机激励三种激励下分析三段模式的减振效果,结果表明通过调节磁流变弹性体刚度能有效改变电力变压器在不同外激励下的共振频率,为进一步开展控制器设计奠定基础。

The power transformer is sustained vibrating in operation, which will not only produce noise and affect the daily life of residents, but also seriously reduce the service life of power equipment and endanger the safety of the power grid. In this paper, a novel basic vibration isolation of magnetorheological elastomer is used for the power transformers, and the three-stage vibration reduction mode is realized by using the adjustable rigidity characteristics of magnetorheological elastomers to realize a controllable damping system applied to power transformers. The dynamic model of the system is further established. The comprehensive performance of the three-stage vibration reduction mode is analyzed under three excitations of harmonic, impact and random excitation. The results show that adjusting the stiffness of magnetorheological elastomer can effectively change the resonance frequency of power transformers under different external excitations. This work lays the foundation for further development of controller design.