Acoustic environment of the Martian surface
Acoustic environment of the Martian surface
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DOI：
10.1029/1999je001174
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发表时间：
2001-03
影响因子：
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通讯作者：
Jean‐Pierre Williams
中科院分区：
文献类型：
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作者：
Jean‐Pierre Williams
在1998年火星极地着陆器上的火星麦克风的支持下，对火星表面的声学环境进行了理论研究，以确定在这种条件下声音的传播是如何衰减的，并预测麦克风可以检测到什么声音。粘性和热松弛（称为经典吸收），分子松弛，和几何衰减被认为是。经典吸收在火星条件下更强，导致可听频率（20 Hz至20 kHz）的声音比在陆地环境中衰减得更强。较高频率（>3000 Hz）将被严重衰减，因为吸收是频率依赖性的。在非常低的次声频率（即，<10 Hz），衰减将主要是由于传播波前的几何扩散，因此将更类似于陆地表面环境。陆地环境中可能的声源包括大沙尘暴、沙尘暴和可能的相关静电放电所产生的风吹尘埃和沙子。最有可能被探测到的声音将是着陆器本身产生的声音和风吹着陆器及其仪器产生的航空声学噪声。
Prompted by the Mars Microphone aboard the 1998 Mars Polar Lander, a theoretical study of the acoustical environment of the Martian surface has been made to ascertain how the propagation of sound is attenuated under such conditions and to predict what sounds may be detectable by a microphone. Viscous and thermal relaxation (termed classical absorption), molecular relaxation, and geometric attenuation are considered. Classical absorption is stronger under Martian conditions resulting in sounds in the audible frequencies (20 Hz to 20 kHz) being more strongly attenuated than in the terrestrial environment. The higher frequencies (>3000 Hz) will be severely attenuated as the absorption is frequency dependent. At very low infrasound frequencies (i.e., <10 Hz), attenuation will be mostly due to geometric spreading of the propagating wave front and will therefore be more similar to the terrestrial surface environment. Probable sound sources in the landed environment include wind-blown dust and sand from large dust storms, dust devils, and possible associated electrostatic discharge. The sounds most likely to be detected will be sounds generated by the lander itself and aeroacoustic noises generated by winds blowing against the lander and its instruments.