On the maximum rate of fluctuation in mode-stirred reverberation
On the maximum rate of fluctuation in mode-stirred reverberation
复制标题
模式搅拌混响的最大波动率
DOI：
10.1109/temc.2005.859061
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发表时间：
2005
影响因子：
2.1
通讯作者：
L. R. Arnaut
中科院分区：
文献类型：
--
作者：
L. R. Arnaut
理论上的限制来自机械/电子搅拌或空间/光谱扫描内的混响腔的最大允许速率。这些限制是基于场波动的最大速率的上限，并且通过对内腔场施加准平稳性的要求来获得。对于正弦激励场，内部场表示为窄带随机混合振幅加频率调制，如由搅拌或扫描过程引起的，并且基于解析场公式。失真（非线性）的模态和有效字段被量化的振幅和频率的一阶变化。它的依赖性的随机幅度调制指数的证明。后者由宏观系统参数估计。分析了净输入功率补偿对畸变和最大搅拌速率的影响。最大搅拌速率与工作频率呈反幂律关系。对于指定的最大失真水平，电子，机械或机电模式搅拌的最大速率。量化和分析了受试设备传递函数阶数对失真的影响，以及由搅拌或扫描引起的感知测试场的失谐、带宽和幅度失真。
Theoretical limits are derived for the maximum permissible rate of mechanical/electronic stirring or spatial/spectral scanning inside a reverberant cavity. These limits are based on upper bounds for the maximum rate of field fluctuations and are obtained by imposing the requirement of quasi-stationarity on the interior cavity field. For a sinusoidal excitation field, the interior field is represented as a narrowband random hybrid amplitude-plus-frequency modulation, as induced by the stirring or scanning process, and is based on an analytic field formulation. Distortion (nonlinearity) of the modal and effective field is quantified for first-order variations of amplitude and frequency. Its dependence on the random amplitude modulation index is demonstrated. The latter is estimated from macroscopic system parameters. The effect of compensation of net input power on the distortion and maximum stirring rate is analyzed. The maximum stirring rate exhibits an inverse power law dependence on the operating frequency. For a specified level of maximum distortion, maximum rates of electronic, mechanical, or electromechanical mode stirring are derived. The effect of the order of the EUT transfer function on the distortion, as well as the detuning, bandwidth, and amplitude distortion of the perceived test field caused by stirring or scanning are quantified and analyzed.