核设备抗震鉴定试验目标PSD生成方法研究

Research of Target PSD Generation in Seismic Qualification Tests of Nuclear Equipment

为避免抗震鉴定试验用人工时程能谱特性失真,需满足功率谱密度80%包络的要求。从楼层反应谱、傅里叶幅值谱和功率谱密度之间的互相关系入手,开展楼层目标功率谱密度生成方法的研究。分别采用Kaul公式法和SRP3.7.1附录A快速傅里叶变换法,将楼层反应谱和人工加速度时程转换为功率谱密度。通过对比分析不同方法的基本假设和不确定性以及获得功率谱密度的形状、峰值的差异,推荐用生成楼层反应谱的原始响应时程进行快速傅里叶变换的方法作为目标功率谱密度的生成方法。

In order to avoid the distortion of power spectral density of the artificial time history in seismic qualification test, the power spectral density envelope should be verified. On the basis of the relationship among floor response spectrum, Fourier amplitude spectrum and power spectral density, the method for generating target power spectral density is studied. Respectively using Kaul formula and SRP3.7.1 appendix A method, fast Fourier transform method are introduced to retrieve the power spectral density of floor spectrum and artificial acceleration. The basic assumptions and uncertainties of different methods and the differences of the shape and the peak value of the obtained power spectral density are comparatively analyzed. The method based on response acceleration and its fast Fourier transfer is recommended as the target power spectral density generating methodology.