Sonar for Practising Engineers, (with solutions) 3rd edition by A. D. Waite

By A. D. Waite

The 1st ebook solely on sonar and sonar know-how. Written through an engineer (with over forty years of expertise within the box) for engineers. Taking an engineering method instead of a physics/math one it offers an realizing of the fundamental ideas of sonar and develops the formulae and "rules of thumb" for sonar layout and function research.

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Rubber). No material transmits sound loss-free - some energy will be absorbed and some reflected. 13). 13 Baffled dome: plan view The elongated dome meets the hydrodynamic requirements. The array, however, can only be close to the dome over about half its circumference. Baffle 1 reduces the stern noise. Performance astern (known in sonar as the non-operational bearings) will inevitably be impaired and this determines the position of baffle 1. It cannot be too close to the array without affecting too many non-astern beams.

Rubber). No material transmits sound loss-free - some energy will be absorbed and some reflected. 13). 13 Baffled dome: plan view The elongated dome meets the hydrodynamic requirements. The array, however, can only be close to the dome over about half its circumference. Baffle 1 reduces the stern noise. Performance astern (known in sonar as the non-operational bearings) will inevitably be impaired and this determines the position of baffle 1. It cannot be too close to the array without affecting too many non-astern beams.

1 1 Cylindrical array To form a beam, a certain number of staves - usually about one-third the periphery of the cylinder - are phased to make them appear as a planar array. Adjacent beams are then formed by stepping around the array at an indexing angle equal to the required beam spacing. , a beam formed by using all the usefully contributing elements on the surface of the cylinder (an aperture of about 120" of the cylinder). The design frequency, fo, is the fkequency where the elements are spaced A/2.

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