Full-field laser-Doppler-vibrometry FRF dataset for a four-bolt aluminum plate under bolt-torque variation

The dataset described in this article comprises full-field scanning laser Doppler vibrometry measurements from a four-bolt aluminum plate tested under controlled bolt-torque variation. Eighteen torque configurations span an all-tight reference, single-bolt intermediate (5 N m) and loose (0 N m) states, and multi-bolt loosening combinations. The repository contains 1838 pointwise Polytec PSV-500 H1 displacement-to-force FRF exports (919 amplitude and 919 phase files) over 1-51,200 Hz at 1 Hz spacing. Comparative analyses use 51 LDV scan points common to every torque state and both signal types. The package further provides scan-point and torque metadata, resonance-selection and tracking tables, global and local FRF-correlation products, recovered PSV acquisition metadata, acquisition-quality coherence/reference-force spectra, figures, and scripts for reproducing the processed layer. For this specimen, quantitative FRF/correlation analysis is recommended up to approximately 25 kHz; the higher-frequency portion is retained as raw data but is dominated by a comparatively low signal level.