振动信号三分之一倍频程谱，估计随机振动信号的频率谱函数-One-third octave spectra of the vibration signal

根据时域信号计算三分之一倍频程下的加速度有效值及功率谱-calculate rms in 1/3 oct freq domain

对振动信号进行频域处理包括：信号谱分析，matlab中没有的窗函数处理，三分之一倍频程处理-The vibration signal of the frequency domain includes: signal spectrum analysis, the window function in MATLAB no, 1/3 octave processing,,,

首先对采样信号进行傅里叶变换，计算出功率谱或幅值谱，然后用功率谱或者幅值谱的数据，计算每一个中心频率的带宽内数据的平均值。(Firstly, Fourier transform is applied to the sampled signal to calculate the power spectrum or amplitude spectrum, and then the average value of the data within the bandwidth of each cente