Transcription of 1 Introduction to Sonar - MIT OpenCourseWare
{{id}} {{{paragraph}}}
Example: biology
1 Introduction to Sonar - MIT OpenCourseWare
1 Introduction TO SONAR11 Introduction to SonarrangeabsorptionDITLSLDTNLP assive Sonar EquationSL TL (NL DI)=DTActive Sonar EquationRLSL*IcebergTLTSNLDIDTNL DISL 2TL+TS (RL)=DT1 Introduction TO SONAR2 *SLTLNLUSADTDIH awaiiTomographySL TL (NL DI)=DTParameter definitions: SL = Source Level TL = Transmission Loss NL = Noise Level DI = Directivity Index RL = Reverberation Level TS = Target Strength DT = Detection Threshold1 Introduction TO SONAR3 Summary of array formulasSource Level SL = 10 logI= 10 logpp22(general)Irefref SL = 171 + 10 logP(omni) SL = 171 + 10 logP+ DI(directional)Directivity Index DI = 10 log(ID)(general)IOID= directional intensity (measured at center of beam)IO= omnidirectional intensity(same source power radiated equally in all directions) DI = 10 log(2 L)(line array) DI = 10 log(( D )(disc array) )2)
Field calculation For an element of length dz at position z, the amplitude at the field position (r,θ)is: ... 1999 Acoustics: Table of attentuation coefficients frequency [Hz] alpha [dB/km] 1 0.003 50000 15.9 ... Absorption of sound in sea water Relaxation mechanism (conversion of acoustic energy to heat) Four mechanisms
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: