A New Approach for Simulating Sound Wave Propagation Based on Lab Experiments Using 3D-printed Models
Understanding infrasound wave propagation is crucial for monitoring volcanic eruptions and nuclear explosions. At local scales (<15 km), infrasound propagation can be complicated by reflection and diffraction from topographic features such as mountains and valleys. Effects of such features need to be quantified to obtain accurate source parameters such as size, timing and location. However, the extent of waveform distortion and energy loss due to topography is still poorly understood, because numerical models often assume flat surfaces or simple terrains and observational data, particularly in the near field, are limited. Here, we propose a new lab-based method that can simulate the wavefields on 3D-printed models with various topographic features and provide experimental datasets.
In this project, we (1) print a physical model with topography close to a sinusoidal pattern and (2) conduct experiments on the model by generating signals with laser blasts and measuring vibrations along the surface. We use pulsed lasers as sources, analogous to volcanic or nuclear explosions. Laser doppler vibrometers, which are sensitive to the motion in the air, record sound waves with dense spatial coverage. We detect air waves traveling above the model’s surface at the speed of sound. Multiple arrivals are also observed in some parts of the wavefield, likely resulting from abrupt elevation changes. Using the data obtained from a flat physical model as references, we investigate how elevation changes affect amplitudes and arrival times of sound waves recorded at different locations. We also examine differences in amplitudes depending on different sizes of explosions by adjusting the source laser power. This new application of the 3D printing technique allows us to build physical models with any desired terrain. Our experimental approach using 3D-printed models will help advance our understanding of infrasound propagation and improve our ability to monitor explosions.
Session: Advances in Seismoacoustic Methods for Explosion Monitoring III
Type: Oral
Room: Regency A-C
Date: 4/22/2022
Presentation Time: 02:45 PM Pacific
Presenting Author: Jiong Wang
Student Presenter: No
Additional Authors
Jiong Wang Presenting Author Corresponding Author jiongwang@uchicago.edu The University of Chicago |
Sunyoung Park sunnypark@uchicago.edu The University of Chicago |
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A New Approach for Simulating Sound Wave Propagation Based on Lab Experiments Using 3D-printed Models
Category
Advances in Seismoacoustic Methods for Explosion Monitoring
Description