Bench-Scale Observation of Sloshing Amplitude Reduction in the Presence of Static Magnets

OverviewLoad-cell–based CGy measurements for a rectangular acrylic tank (600 × 60 × 300 mm; water depth h = 40 mm) under near-resonant horizontal excitation (f ≈ 0.55 Hz). Two magnet configurations were tested in paired campaigns: 1. Split-wall (15 + 15) — weak symmetric field, baseline verification.2. Single-wall high-field (Mag-30@L vs Dummy-30@L) — all 30 magnets on one wall versus mass-matched non-magnetic dummies. The first 5 s of each run were discarded; the subsequent 20 s steady window was analyzed. Sampling rate ≈ 191 Hz. A 2 mm ferromagnetic plate was mounted outside the tank bottom and kept identical in all runs. ------------------------------------------------------------Contents- raw/ — two ZIP archives (20 CSV files in total: 10 Dummy, 10 Magnet; ~191 Hz). Typical columns: Time (s), CGy (mm) (SI units).- figures/ — updated paper figures: mag30_p2p_bytrial.png, mag30_rms_bytrial.png mag30_fft_0_5Hz.png, mag30_fft_10_20Hz.png overlay_mag30_zoom.png, overlay_mag30_diff_zoom.png testBench2.png, testBench3.png- code/ — magnet_paired_analysis.ipynb (updated) reproduces all analyses and plots. ------------------------------------------------------------ReproducibilityUnzip the raw CSVs, open the notebook, and run all cells. It (i) computes P2P and RMS per trial,(ii) performs paired t-tests and Wilcoxon checks (Mag – Dummy), and(iii) generates FFT spectra (Hann window) over [0.2, 20] Hz, highlighting 0–5 Hz and 10–20 Hz bands.The notebook auto-detects column names and produces mean ± SEM plots consistent with the manuscript. ------------------------------------------------------------LicenseData: CC BY 4.0Code: MIT (notebook included under code/) ------------------------------------------------------------Version history (Changelog)- v2 (this): Added single-wall high-field (Mag-30@L vs Dummy-30@L) campaign; 10 paired runs; new CSV datasets, FFT and ΔCGy plots; improved statistics and SEM visuals; updated figures & notebook.- v1 (2025-09-09): Initial release (split-wall 15 + 15 configuration). ------------------------------------------------------------CitationCite the concept DOI (always resolves to the latest version): 10.5281/zenodo.17088106For exact replication, also cite this version’s DOI (displayed on the right after publishing). ------------------------------------------------------------Keywordssloshing; center of gravity; CGy; static magnets; Mag-30@L; Dummy-30@L; FFT; bench-scale; dataset