Since the vehicle/track interaction produces a wide-ranging vibratory phenomenon, this results in different types of noise: besides the rolling noise, the ground-borne noise and the structure-borne noise are generated as reflection of ground-borne vibration [12].
Fig. 4 Simulated phase shift (top), elevation (middle) and virtual height (bottom) variations vs group range for the reflection points of ground scatter in Fig. 3.
The reflections of ground-grown crystal was indexed on a centred monoclinic lattice (C2 with unit cell parameters a = 117.40 Å, b = 80.95 Å, c = 99.81 Å, α = 90°, β = 96.76°, and γ = 90°).
The Pellis strolled outside the atrium on the West Street side, and, facing the Winter Garden, were surprised by a reflection of the ground-zero panorama on the new facade.
The main beam of the transmitting and receiving antenna is oriented perpendicularly to the surface of the brick wall to avoid the multiple influence of reflection from the ground.
This paper presents a concept of an aircraft noise monitoring terminal (NMT) that reduces background noise and the influence of ground reflection, in comparison with a single microphone.
Their equation did not assume Gaussian distribution nor did it include the effect of ground reflection of the pollutant plume.
Sir Graham Sutton derived an air pollutant plume dispersion equation in 1947 which did include the assumption of Gaussian distribution for the vertical and crosswind dispersion of the plume and also included the effect of ground reflection of the plume.
The SNR data value strongly depends on the elevation angle, and the SNR value may oscillate at low elevation angles (<25°) because of ground reflections of the GPS signal (Larson 2013) with sidereal shifting.
Test cases are presented here to demonstrate the importance of hydrodynamic interactions responsible for the double peak in the sound spectrum in the case of clustered rocket nozzles, and the role of ground reflections in the case of noninterfering jets.
The capabilities of the optimization algorithm are demonstrated with two numerical examples in which the reflection and dissipation of ground-borne wave pulses are maximized.
