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By K Attenborough; V I Tokarev; Oleksandr Zaporozhets

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Extra info for Aircraft noise propagation, exposure & reduction : assessment , prediciton and control

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The ‘minimum noise impact’ vector of criteria is large but the determination of 34 A review of the aircraft noise problem its structure is an important task. For example, certain optimization criteria determine the parameters for low noise flight procedures. The effects of aircraft noise include speech and sleep interference, and physiological, psychological and social problems. Annoyance from aircraft noise depends on both acoustical and non-acoustical factors. The latter include fear of aircraft crashing, potential benefits, housing availability, possibilities for compensation, sensitivity to noise and so on.

29) represents the sound field as the sum of spherical and dipole sources on the surface. 22 A review of the aircraft noise problem Sound radiation by a flat surface is given by Huygen’s formulas. The first Huygen’s formula gives the field over a perfectly hard surface as ϕ (R) = 1 2π ∂ϕ exp(ikr) dS. 30) The acoustical field over a perfectly soft surface is determined by the second Huygen’s formula as ϕ (R) = − 1 2π ϕ S ∂ exp(ikr) dS. 32) −∞ −∞ where γ = α 2 + δ 2 − k2 , function (βx , βy , βz ) is a Fourier transformation of the multipole source term (x, y, z), α, δ, βx , βy , βz are complex variables, k is the wave number and A(α, β ) is an unknown function defined by the solution of a boundary value problem.

The oldest, noisier jet transport aircraft are ‘non-noise certificated’ (NNC), the second generation’s characteristics are reflected in Chapter 2 of Annex 16 and the most modern, quieter aircraft meet the standards in Chapter 4. A review of the aircraft noise problem 45 Air transport was among the first of the world’s transport industries to meet internationally accepted noise regulations. People living around airports often feel that air transport is a heavy strain on the local environment particularly with regard to noise.

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