铁路轨道不平顺随机过程的数值模拟

Numerical Simulation of the Stochastic Process of Railway Track Irregularities

分析了目前广泛应用的几种轨道不平顺模拟方法，构造了基于频域功率谱等效的一种新的算法，分别求出频谱的幅值和随机相位，再通过傅立叶逆变换得到轨道不平顺时域模拟样本。数值模拟试验表明：这种模拟方法较其它模拟方法更为简洁有效。

Several widely used methods for simulating track irregularities at present are analyzed, and a new algorithm for describing the stochastic process of the railway track irregularities is constructed based on the power spectrum density equivalency in a frequency domain. The magnitude and random phase of the frequency spectrum are obtained respectively, then the simulation sample in a time domain is achieved through inverse Fourier transform (IFFT). Numerical simulation tests show that the new method is more concise and effective than other methods.