## The acoustic monopole in motion |

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acoustic driver acoustic monopole consists acoustic pressure angular frequency asphalt surface boundary condition cancellations are seen cm/point cMsine(cose-M comparisons constant linear acceleration constant velocity convection term corresponds curves discrete frequency driver of restricted effect of source effects of forward effects of motion equation experiment and theory experimental source fairly hard acoustic figure finite impedance reflecting forward motion Fourier transformation free space ground impedance ground surface ground to observer impedance reflecting plane interval between computed Mach number magnitude microphone array Monopole in Motion monopole moving moving with constant NASA observed signal due observer distance Observer height obtained oscillator frequency Performing Organization point source moving radiation reflected wave reflection coefficient reinforcements and cancellations Security Classif source acceleration source frequency source motion source to observer source travel distance source velocity theoretical and experimental theoretical monopole type point source U. S. Customary Units