Finally , the wave equation of the electromagnetic field of this kind damper is derived from the maxwell ' s equation . the magnetic flux density at the boundary is assumed to be harmonic , so the analytical result of the wave equation is solved . when the rotor rotates , eddy currents flowing inside the conducting material field are caused 最后，应用ahrens的电磁轴承简化模型，从maxwell方程出发推导了应用于本文所述的被动式电磁阻尼器的波动方程，并用傅立叶级数把矩形磁场展开的谐变磁场作为磁场的边界条件，通过求解波动方程得到磁场的解析解，从而计算了阻尼器对转子的电磁力和由涡流引起的切向力产生的阻尼器附加功耗。
As a result , the electromagnetic field intensity is changed accordingly and fluctuating current in the damper coil is created . damping force is mostly produced because of the phase difference between fluctuating current and displacement of rotor . the formulas of fluctuating current and damping coefficient are deduced theoretically , and the calculated results are consistent with the experimental results 通过分析发现电磁阻尼器线圈内由于转子涡动时变化的磁场而产生的波动电流与转子位移间的相位差是产生阻尼的主要原因，推导了波动电流、阻尼系数的计算公式，并通过实验展示了被动式电磁阻尼器的阻尼效应。
In this thesis , a single disk rotor supported by two rolling bearings is used for studies , and a new method of reducing the vibration is proposed . the main works of this thesis are as follows : based on the comparison of various control methods for vibration suppression , a kind of passive electro - magnetic damper is presented . the structure of it is similar to that of the active magnetic bearing 为了降低转子的振动，增加系统的稳定性，本文在总结当前国内外学者研究的基础之上，提出了被动式电磁阻尼器的概念，并确立了本文的研究目标和研究方法：以工程应用为背景，结合转子动力学理论、电磁学理论以及数据采集技术，以理论辅以实验的方法，对被动式电磁阻尼器特性进行深入研究。
Against the status of large scale ultra low frequency air spring vibration isolation platform , which is low damping and poor performance of low frequency , and after analyzing the existing key damping system , a new type differential electromagnetic damping system ( emds ) is developed in this article in order to reduce the resonance peak of the platform effectively and improve the low frequency performance of the platform 本文针对大型超低频空气弹簧隔振平台阻尼小、低频隔振性能较差的现状,在比较多种提供阻尼力的方法后,提出了用电磁力作为隔振平台的阻尼力,并开发研制了差动式电磁阻尼器系统。该系统可以有效降低隔振平台的谐振峰值,从而达到了提高隔振平台低频性能的目的。
