Remington Paul J, Curtis Alan R D, Coleman Ronald B, Knight J Scott
BBN Technologies, 10 Moulton Street, Cambridge, Massachusetts 02138, USA.
J Acoust Soc Am. 2008 Mar;123(3):1427-38. doi: 10.1121/1.2835608.
The use of a single actuator tuned to an optimum impedance to control the sound power radiated from a turbulent boundary layer (TBL) excited aircraft panel into the aircraft interior is examined. An approach to calculating the optimum impedance is defined and the limitations on the reduction in radiated power by a single actuator tuned to that impedance are examined. It is shown that there are too many degrees of freedom in the TBL and in the radiation modes of the panel to allow a single actuator to control the radiated power. However, if the panel modes are lightly damped and well separated in frequency, significant reductions are possible. The implementation of a controller that presents a desired impedance to a structure is demonstrated in a laboratory experiment, in which the structure is a mass. The performance of such a controller on an aircraft panel is shown to be effective, if the actuator impedance is similar to but not the same as the desired impedance, provided the panel resonances are well separated in frequency and lightly damped.
研究了使用一个调谐到最佳阻抗的单个致动器来控制从湍流边界层（TBL）激励的飞机面板辐射到飞机内部的声功率。定义了一种计算最佳阻抗的方法，并研究了调谐到该阻抗的单个致动器在降低辐射功率方面的局限性。结果表明，TBL和面板的辐射模式中存在太多自由度，以至于单个致动器无法控制辐射功率。然而，如果面板模式的阻尼较小且在频率上分离良好，则有可能实现显著的降低。在一个实验室实验中展示了一种向结构呈现所需阻抗的控制器的实现，其中结构是一个质量块。如果致动器阻抗与所需阻抗相似但不完全相同，并且面板共振在频率上分离良好且阻尼较小，那么这种控制器在飞机面板上的性能将被证明是有效的。
