活塞式磁性液体减振器的阻尼分析和实验研究

发布时间：2018-11-12 11:49

【摘要】：根据磁性液体的磁粘特性,当磁性液体周围施加垂直于其涡旋矢量方向的磁场时,磁性液体的粘度增加,利用磁性液体作为减振器的阻尼液,通过改变磁场可以调节振动系统的阻尼比,从而达到减振的目的。根据这一特性,提出一种活塞式磁性液体减振器。根据磁性液体的流动方程和连续性方程,建立了减振器中磁性液体的动力学模型,并得到减振器阻尼力与振动速度之间的表达式以及减振系统的阻尼比。设计实验,将磁性液体减振器安装在悬臂梁自由端,利用线圈对减振器施加均匀磁场,研究不同线圈电流时磁性液体减振器对梁振动阻尼比的影响。实验表明,在所假设的条件下,实验结果与理论结果的一致性较好。同时得出,在一定范围内,活塞式磁性液体减振器的阻尼效果随着线圈电流的增大而增大。
[Abstract]:According to the magnetic viscosity of the magnetic fluid, when the magnetic field perpendicular to its vortex vector is applied around the magnetic fluid, the viscosity of the magnetic fluid increases, and the magnetic liquid is used as the damping fluid of the shock absorber. The damping ratio of the vibration system can be adjusted by changing the magnetic field. According to this characteristic, a piston type magnetic liquid shock absorber is proposed. According to the flow equation and continuity equation of magnetic fluid, the dynamic model of magnetic fluid in shock absorber is established, and the expression between damping force and vibration velocity and damping ratio of damping system are obtained. In the design experiment, the magnetic liquid damper is installed at the free end of the cantilever beam, and the effect of the magnetic liquid damper on the vibration damping ratio of the beam is studied by applying the uniform magnetic field to the damper by using the coil. The experimental results show that the experimental results are in good agreement with the theoretical results under the hypothetical conditions. At the same time, in a certain range, the damping effect of piston magnetic liquid damper increases with the increase of coil current.
【作者单位】：河北工业大学电磁场与电器可靠性省部共建重点实验室;天津工业大学电工电能新技术天津市重点实验室;
【基金】：河北省自然科学基金(E2015202241)项目资助
【分类号】：TB535.1

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