摘要
本文提出了计算线性时变涡流场的有限元——快速傅里叶变换(FFT)方法,将时变涡流场的有限元方程变换到频域求解,该法解决了时步迭代法计算暂态场引起的累计迭代误差问题。文中对由变换造成的时域截断误差进行了讨论并介绍了消除误差的方法。最后用一简单算例对该算法做验证,其计算精度满足了工程上的要求。
A new method of finite element—Fast Fourier Transformation(FFT)for calculating the linear time-dependent eddy current fields is presented.The finite element equations for time-dependent eddy current fields are transformed into fre- quency domain to carry out the calculation.Thus,the problem of accumulated iteration error caused by the time-step iteration method for calculating time-de- pendent electromagnetic field is solved.The techniques for reducing the transfor- mation error are discussed.Finally,the method is demonstrated by art example. The resalts show that the accuracy is satisfactory for engineering applications.
