A Study on Vibration Test with Noncontact Based on Magnetic Levitation

众所周知，结构振动测试主要有两种方法。一种是正弦曲线法和随机激励法。二是脉冲激励法。在这些情况下，致动器与测试结构随时同步。因此，对于像高速旋转的旋转机械或高速运动的车辆这样的运动结构，其动态特性的测量是比较困难的，本文提出了一种新的测量思路和方法。也就是说，我们验证了这是非常有用的三维励磁器与非接触的磁悬浮为基础的测量运动结构的动力学。该方法同样适用于高速旋转的旋转轴。（1）研究开发使用永磁体和电磁体的新型混合致动器以节省能量的工作，（2）研究实现被控对象与致动器之间的高刚度的工作，（3）研究如何使用具有高稳定性的致动器激励，（4）同时激发三个方向的研究工作我们已开展了上述各项研究工作。通过理论分析和实验研究，我们认为这种新型激励器的非接触实现是可能的。此外，我们将继续这项研究工作，以实现实际的测试励磁机。

It is well known that there are major two vibration test method for structures. One is the sinsoidal and the random excitation method. The other is impulse excitation method. In these cases, actuators contac with test structures anytime. Therefore, it is difficult to measure the dynamic characteristics for moving structures in running and working like a rotating machinery in high speed rotations or a moving vehicle in high speed.This research work proposes a new concept and new strategy to measure dynamic characteristics for such moving structures. Namely, we verified that it is very useful for a three dimensional excitor with noncontact based on magnetic levitation to measure the dynamics of moving structures. This method will be also applied to rotating shaft in high speed rotation.We tried the following research works ; (1)The research work to develop the new hybrid actuators using permanent magnets and the electromagnets to save a energy, (2)The research work to realize the high stiffness between the controlled objects and the actuators, (3)The research works how to excite using actuators with high stability, (4)The research work to excite the three directions simultaneously.We have carried out the research work concerning above mentiond items. We concluded that it is possible to realize this new excitor with noncontact through the theoretical work and the experiments. Also, we will continue this research work to realize the actual test excitor.