OpenModelica 中的可变采样频率 [英] Variable sampling frequency in OpenModelica

问题描述

我指的是这篇文章:

具有不同采样范围的示例函数的替代方案

我想测量具有可变采样频率的 RMS 值(或平均值)，我可以将其作为输入信号输入.

I want to measure an RMS value (or a mean value) with a variable sampling frequency, which i can feed in as an input signal.

几乎适合我需要的建议方法如下:

The suggested way which nearly suits my need is the following:

model RMS
  constant Real f_max = 2*2*asin(1.0);
  constant Real f = 1+abs(2*asin(time));
  Real signal = sin(time);
  Real rms = if time < f then (if time < 1e-10 then signal else sqrt(i_sq / time)) else sqrt(i_sq_f / f);
  Real i_sq(start=0, fixed=true);
  Real i_sq_f = i_sq - delay(i_sq, f, f_max);
equation
  der(i_sq) = signal^2;
end RMS;

这会引发错误:可变性 CONST 的分量 f 具有更高可变性 VAR 的绑定 1.0 + abs(2.0 * asin(time)).

This one throws the error: Component f of variability CONST has binding 1.0 + abs(2.0 * asin(time)) of higher variability VAR.

有没有办法解决这个问题并将频率作为真实输入值输入?

Is there a way to solve this problem and feed in the frequency as a real input value?

推荐答案

f 的表达式是随时间变化的，但 f 被声明为 constant.

The expression for f is time-varying but f is declared as constant.

只需将 constant Real f = ... 替换为 input Real f = ....然后您可以从外部"指定 f如果您愿意，可以选择模型.

Simply replace constant Real f = ... with input Real f = .... Then you can specify f from the "outside" of the model if you like.

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