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首页> 外文期刊>Review of Scientific Instruments >Nonlinear Control Theory for Constant‐Temperature Hot‐Wire Anemometers
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Nonlinear Control Theory for Constant‐Temperature Hot‐Wire Anemometers

机译:恒温热线风速计的非线性控制理论

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摘要

The linear control theory for constant‐temperature anemometers can be extended to the nonlinear case which applies for large velocity fluctuations. The nonlinear theory establishes the domain within which the linear theory is valid and reveals some nonlinear effects for large velocity fluctuations. Calculations using a second order approximation have been carried out for velocity fluctuations as large as ±64% of the mean velocity. They show in case of a sinosoidal input function the generation of a second harmonic at the output which limits the usefulness of the anemometer at high frequencies. In case of a large velocity step, a longer time is required to indicate the step correctly than is required for the indication of a small step.
机译:恒温风速计的线性控制理论可以扩展到适用于大速度波动的非线性情况。非线性理论建立了线性理论有效的范围,并揭示了一些大速度波动的非线性效应。对于二阶速度的波动,已经进行了二阶近似计算。它们显示了在正弦输入函数的情况下,在输出端会产生二次谐波,从而限制了风速计在高频下的实用性。在大速度步长的情况下,与指示小步长所需的时间相比,正确指示步长需要更长的时间。

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  • 来源
    《Review of Scientific Instruments》 |1969年第2期|共5页
  • 作者

    Freymuth Peter;

  • 作者单位

    Department of Aerospace Engineering Sciences, University of Colorado, Boulder, Colorado 80302;

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  • 原文格式 PDF
  • 正文语种 eng
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