Study on the semi-active damper using magnetic particles and magnetic field

在磁性复合流体中加入纤维材料可以有效地提高阻尼器的阻尼力。当磁性功能流体中含有针状磁性颗粒时，通过施加磁场可以改变磁性功能流体的粘性。我们发现，当工作磁复合液中含有少量具有针状磁性颗粒的磁流体时，阻尼力变得更强。磁粒子组合阻尼器在磁场作用下阻尼力增大，在死点附近阻尼力迅速增大。采用颗粒组合的阻尼器的阻尼性能取决于阻尼器的设置角度。在阻尼器边缘处设置两个磁体，通过施加磁场抑制阻尼力对阻尼器设置角的依赖性是有效的方法。

Adding fibrous material to a magnetic compound fluid is effective on increasing damping force of a damper. Viscous property of a magnetic functional fluid can be changed by applying magnetic field when needle-like magnetic particles are contained in the fluid. We have found that the damping force becomes stronger when the working magnetic compound fluid contains little amount of magnetic fluid with needle-like magnetic particles.The damping force of a damper using a magnetic particle assemblage increases in the presence of magnetic field and the damping force rapidly increases near the dead centers. The damping propery of the damper using a particle assemblage depends on the setting angle of the damper. Applying magnetic fied by two magnets arranged near the edge of the damper is useful method to suppress the dependency of damping force on the setting angle of the damper.