scholarly journals Acoustic pulse propagation in an urban environment using a three-dimensional numerical simulation

2014 ◽  
Vol 135 (6) ◽  
pp. 3231-3242 ◽  
Author(s):  
Ravish Mehra ◽  
Nikunj Raghuvanshi ◽  
Anish Chandak ◽  
Donald G. Albert ◽  
D. Keith Wilson ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Urban Environment ◽  
Pulse Propagation ◽  
Acoustic Pulse ◽  
Three Dimensional

Validation of 3D numerical simulation for acoustic pulse propagation in an urban environment

2012 ◽  
Vol 131 (4) ◽  
pp. 3333-3333
Author(s):  
Ravish Mehra ◽  
Nikunj Raghuvanshi ◽  
Anish Chandak ◽  
Don Albert ◽  
Keith Wilson ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Urban Environment ◽  
Pulse Propagation ◽  
Acoustic Pulse ◽  
3D Numerical Simulation

Acoustic pulse propagation in an urban environment

2005 ◽  
Vol 117 (4) ◽  
pp. 2418-2418
Author(s):  
Donald G. Albert ◽  
Lanbo Liu
Keyword(s):  
Urban Environment ◽  
Pulse Propagation ◽  
Acoustic Pulse

scholarly journals V2I Propagation Loss Predictions in Simplified Urban Environment: A Two-Way Parabolic Equation Approach

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2011
Author(s):  
Mikhail Lytaev ◽  
Eugene Borisov ◽  
Andrei Vladyko
Keyword(s):  
Numerical Simulation ◽  
Parabolic Equation ◽  
Urban Environment ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Three Dimensional ◽  
Propagation Loss ◽  
Propagation Modeling ◽  
Hoc Networks ◽  
Wave Propagation Modeling

This study is devoted to radio wave propagation modeling in the urban environment. Special attention has been paid to the features of vehicular ad hoc networks (VANETs) and vehicle-to-infrastructure (V2I) communications. For the first time, the three-dimensional bidirectional parabolic equation (PE) method has been applied to the specified problem. Buildings and other obstacles are modeled by impenetrable (perfectly electric conducting) cuboids. A harmonic radiation source with an arbitrary direction pattern may be modeled. Numerical simulation is performed for various propagation scenarios. A comparison with the ray-tracing (RT) method is given. The results of the numerical simulation prove the effectiveness and reliability of the proposed method. Some recommendations for deploying VANETs are obtained based on the numerical results.

NEAR-AXIAL INTERFERENCE EFFECTS IN LONG-RANGE OCEAN ACOUSTIC PULSE PROPAGATION

2008 ◽  
Vol 16 (02) ◽  
pp. 279-301
Author(s):  
NATALIE S. GRIGORIEVA ◽  
GREGORY M. FRIDMAN
Keyword(s):  
Long Range ◽  
Pulse Propagation ◽  
North Pacific Ocean ◽  
Acoustic Pulse ◽  
Three Dimensional ◽  
Realistic Model ◽  
Center Frequency ◽  
Sound Channel ◽  
The Time Domain ◽  
Dimensional Range

In many long-range ocean propagation experiments the source and receiver are placed close to the depth of the waveguide axis. In this case, rays emerging from the source at sufficiently small angles intersect the sound-channel axis many times and form in its vicinity a large number of caustics with caustics cusps located repeatedly along the axis. In neighborhoods of cusped caustics there exists a very complicated interference pattern. Neighborhoods of interference grow with range and at long ranges they overlap. As a result, a complex interference wave (axial wave), that propagates along the waveguide axis, appears. The goal of this paper is to obtain the representation for the axial wave in the time domain and calculate its magnitude for a realistic model of a three-dimensional range-independent medium. Numerical computations are done for the average profile from the Acoustic Engineering Test (AET) experiment. The pulse center frequency of 75 Hz with 30-Hz bandwidth is used that corresponds to broadband acoustic signals which were transmitted during November 1994 in the eastern North Pacific Ocean as a part of the AET. The propagation range is 3250 km. The sound source is located on the waveguide axis, and the receiver is placed close to the depth of the axis. Through numerical simulation the dependencies of the magnitude of the axial wave on depth of the receiver and propagation range are studied.

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