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Method for generating high frequency high level noise fields using low frequency excitation of aeroacoustic noise
Method for generating high frequency high level noise fields using low frequency excitation of aeroacoustic noise
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机译：利用航空声噪声的低频激励产生高频高电平噪声场的方法
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摘要
There is described a system for producing noise particularly for sonic testing of an article, such as a satellite, in a reverberation chamber. In one of its aspects the system comprises a low frequency high- level broad-band noise source; a tube means including a section formed as an acoustic horn connected at its small end to the low frequency source and at its large end to the chamber. A Hartmann-type air acoustic high level noise generator, or generators are located inside the tube at a predetermined position. In operation the generator is excited by the generated low frequency noise to provide an output of non-linearly modulated noise. Also described is a Hartmann-type noise generator which comprises a nozzle and an aligned acoustic tube spaced therefrom by an air gap. A reverberation cup is formed in the mouth of the tube facing the nozzle and a bridge member extends between the nozzle and tube and spans the air gap. Means is provided for varying the depth of the reverberation cup and for adjusting the size of the gap if desired.
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