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发表于 2008-10-27 19:53
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我公司机型是F-16000BDH/SLS16 环境试验机型号是VC-102DAMX-32-P2R 以下是随机试验设置的界面
以上是频率 能量谱密度(PSD光谱密度)警戒线 禁止线 倾斜度 的设置画面 时间 频率带和线性数忘记拍了
我们的频率设置有初始频率和最终频率 为什么啊 有什么意义啊
因为标准有如下这句话
effective frequency range
frequency range between 0,5 times f1 and 2,0 times f2(f1为最小频率,f2为最大频率)
所以这个10~1000Hz的频率带要2000
下面标准中红色字体显示出试验中的频率会超过2倍最高频率。。。难以理解。。。请高手解答
Frequency resolution
The frequency resolution Be in Hz necessary to minimize the difference between the true and
the indicated acceleration spectral density shall be selected by taking the digital controller
frequency range divided by the number of spectral lines (n).
Be = Fhigh/n (2)
where
Fhigh is the frequency range chosen from the options provided by the digital vibration control system in Hertz and should be equal or greater than 2f2, that is Fhigh大于等于 2f2, see Figure 1;
n is the number of spectral lines equally spread over the frequency range to fhigh.The number of spectral lines, n, should be at least 200. Frequency resolution shall be given in the relevant specification (see also Clause 11, item j)) and stated in the test report. Be shall be chosen such that, as a minimum, a frequency line coincides with the frequency f1 in Figure 1 and the first frequency line is at 0,5 of f1; also that two frequency lines define the initial slope. If this gives two different values then the smallest Be shall be chosen.NOTE There is a compromise between having a finer Be, resulting in a longer loop control time and better definition of the spectrum, or having a coarser Be, resulting in a shorter loop control time and worse definition of the spectrum.
initial slop 和 Final slope 的含义是什么 |
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