Computer-aided modeling and visualization of sound waves propagation in a Tapered Quarter Wavelength Tube
Bibliographic record
Abstract
The paper presents the algorithmic basis for computer-aided modeling of sound wave propagation in an acoustic system with an acoustic design in the form of a straight and folded tapered quarter wavelength tube (TQWT). The aim of the modeling is to compare the systems by fidelity of the signal reproduced and localize acoustic excitation zone inside the acoustic system, where installation of a layer of absorbing material is effective for control of wave propagation. The computer-aided modeling of acoustic wave propagation utilizes an algorithm based on a hyperbolic differential equation with attenuation component. A web application has been developed in JS programming language for CPU and GLSL ES language for parallel computing on GPU, which works according to the presented algorithm to simulate the wave propagation process. The program visualizes wave propagation in real-time based on the initial parameters of the environ-ment, such as: the geometric configuration of acoustic enclosure (constructed using line segments), the coordinates of the location and geometric configuration of the wave source, angular velocity of the generator and the wave amplitude, the Courant number, the attenuation coefficient, the size of the simulation grid. The software made it possible to calculate the constructive and destructive interference maps of the wave generated by the speaker’s front side with the wave emerging from the acous-tic system’s port of straight and folded tapered pipe. With a grid size of 512 x 288, the algo-rithm achieved a processing speed of over than 75 time-steps per second using a processor with parallel computing Intel UHD 630. The maps showed that the zones of acoustic excitation were located inside the acoustic enclosure opposite to the wave source. It is shown that the acoustic enclosure in the form of a folded TQWT effectively suppresses high and medium frequencies by attenuating the wave with the configuration of the walls behind the broadband source. The con-figuration prevents unpredictable amplification or attenuation of the specified frequencies and, as a result, increases the fidelity of signal reproduction.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".