By Wayne Mutza
Strains military, USN, USMC and USAF helicopter pilot encounters with that outdated aviation announcing Any touchdown you could stroll away from... Over one hundred fifty pictures, eight pages of colour. sixty four pages.
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Additional resources for Bent & Battered Rotors
The rms noise voltage vw for a single loop when the surface wave propagates along the x axis (Fig. 8 m/s), λ is the wavelength of the surface wave, Lw is the length of the wave’s crest (assumed to be 7λ but not greater than L), f is the frequency of the surface wave, and b w is the rms of the vertical magnetic field generated by the ocean surface wave. ) It is clear from Eq. 10) that maximum wave noise is produced when W equals an odd multiple of a half-wavelength, while the minimum occurs at multiples of a full wavelength.
Models of the magnetic field produced by ocean surface waves and swells have been the subject of many investigations. 14) where A = am F (S + iC) , γ β = 2, m γ = 4πωμ0 σ, S = sin (I ) , C = cos (I ) cos (θ ) , and a is the amplitude of the ocean’s surface wave (half of the crest-to-trough wave height), F is the magnitude of the earth’s magnetic field in tesla, I is the angle that the earth’s field makes with the horizontal (called the dip angle), θ is the eastward inclination angle from magnetic north for the direction of the surface wave propagation, σ is the seawater conductivity in S/m, μ0 is free space permeability (∼4π × 10−7 H/m), and all other terms have been defined previously.
This is also true of other influence fields. As a result, setting a mine’s actuation thresholds must be handled on a statistical basis. Full-scale measurements or mathematical models that capture the variation in the magnetic field signatures of naval vessels can be used to determine the probability of a ship actuating a mine as a function of its relative location. Passing large numbers of signatures through hardware or software simulations of an influence mine will produce a probability-of-actuation curve similar to the idealized example shown in Fig.