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，可有效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，施加磁场可以改变流体的粘性。研究发现，当磁性复合流体中含有少量的针状磁性颗粒时，阻尼力增大，磁性颗粒复合体阻尼器的阻尼力在磁场作用下增大，且在死点附近迅速增大。颗粒复合阻尼器的阻尼性能取决于阻尼器的安装角度。通过设置在阻尼器边缘附近的两个磁体施加磁场是抑制阻尼力对阻尼器安装角的依赖性的有效方法。

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.