Detection Of Micro Vibrations In Air Duct Structures Using Phase-Based Motion Magnification And Fast Fourier Transform
DOI:
https://doi.org/10.22441/jte.2026.v17i3.002Abstract
Micro‐vibrations in HVAC air‐duct structures can compromise energy efficiency and structural integrity, yet conventional contact based vibrometry is constrained by installation complexity and environmental sensitivity. This study develops a non‐contact micro‐vibration detection system by integrating Phase‐Based Motion Magnification (PBMM) with Fast Fourier Transform (FFT) analysis, and validates its performance against a Micro-Electro-Mechanical Systems (MEMS)‐based ADXL345 accelerometer. High‐resolution 4K video (60 fps) of a galvanized, rigid square duct (0.8 m × 0.8 m) was processed through a steerable complex pyramid, ideal band‐pass temporal filtering, and phase amplification (α = 20). The magnified phase sequences were reconstructed and subjected to Hann‐windowed, detrended FFT, with dominant frequency peaks refined via parabolic interpolation. Validation with the ADXL345 time‐series yielded a mean absolute frequency error of 2.53 Hz (σ = 1.06 Hz) across five measurement points. Temporal band‐pass settings effectively suppressed spectral artifacts, and phase gain influenced magnification clarity. Computational performance averaged around 10 s/frame on CPU, indicating real‐time feasibility with GPU acceleration. The proposed PBMM+FFT approach offers a practical, non‐invasive alternative for structural vibration monitoring in HVAC systems.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
The copyright to this article is transferred to Universitas Mercu Buana (UMB) if and when the article is accepted for publication. The undersigned hereby transfers any and all rights in and to the paper including without limitation all copyrights to UMB. The undersigned hereby represents and warrants that the paper is original and that he/she is the author of the paper, except for material that is clearly identified as to its original source, with permission notices from the copyright owners where required. The undersigned represents that he/she has the power and authority to make and execute this assignment.
We declare that:
1. This paper has not been published in the same form elsewhere.
2. It will not be submitted anywhere else for publication prior to acceptance/rejection by this Journal.
3. A copyright permission is obtained for materials published elsewhere and which require this permission for reproduction.
Furthermore, I/We hereby transfer the unlimited rights of publication of the above mentioned paper in whole to UMB. The copyright transfer covers the exclusive right to reproduce and distribute the article, including reprints, translations, photographic reproductions, microform, electronic form (offline, online) or any other reproductions of similar nature.
The corresponding author signs for and accepts responsibility for releasing this material on behalf of any and all co-authors. This agreement is to be signed by at least one of the authors who have obtained the assent of the co-author(s) where applicable. After submission of this agreement signed by the corresponding author, changes of authorship or in the order of the authors listed will not be accepted.
Retained Rights/Terms and Conditions
1. Authors retain all proprietary rights in any process, procedure, or article of manufacture described in the Work.
2. Authors may reproduce or authorize others to reproduce the Work or derivative works for the authors personal use or for company use, provided that the source and the UMB copyright notice are indicated, the copies are not used in any way that implies UMB endorsement of a product or service of any employer, and the copies themselves are not offered for sale.
3. Although authors are permitted to re-use all or portions of the Work in other works, this does not include granting third-party requests for reprinting, republishing, or other types of re-use.
