Source-linked AI summary
Full-field laser-Doppler-vibrometry FRF dataset for a four-bolt aluminum plate under bolt-torque variation
Berkay Kullukcu, Dina Hannebauer
TL;DR
The paper addresses the need for vibration-response data covering bolt-torque variation in a four-bolt aluminum plate. It constructs and documents a full-field laser-Doppler-vibrometry FRF dataset spanning 18 torque states, 51 scan points, and frequencies from 1 Hz to 51,200 Hz.
Problem
The dataset captures how vibration characteristics vary across selected tightening-torque combinations in a four-bolt aluminum plate.
Method
A Polytec PSV-500 scanning laser Doppler vibrometer measured pointwise H1 displacement-to-force FRF amplitude and phase during automated modal-hammer excitation under free-free conditions.
Results
The resulting database contains 18 torque states measured at 51 common scan points, with amplitude and phase exports covering 1 Hz to 51,200 Hz at 1 Hz resolution.
Takeaways & Limitations
The 51-point, 1 Hz-resolution dataset supports benchmarking FRF-correlation, modal-assurance-criterion, and FRF-shape damage-localization methods, as well as teaching applications.
Takeaways & Limitations
The dataset represents one plate configuration, one boundary-condition realization, and one nominal preload range, while frequencies beyond 25 kHz are mostly noise without resonances.
Abstract
from arXiv · showhide
The dataset described in this article was constructed using the results of laser Doppler vibrometry experiments conducted on an aluminum plate having four bolts. The database captures the variation in the vibration characteristics of the plate as a function of changes in tightening torque on the bolts. In total, there were 18 different states for the tightening torque, ranging from a situation where all bolts are tightened to all bolts being loose. Other possible combinations include states with varying torque applied to just one bolt, and those involving multiple loose bolts. Data consist of 1,836 files exported from Polytec PSV-500, categorized as amplitude and phase data, for frequency ranges spanning 1 Hz to 51,200 Hz at intervals of 1 Hz. The identified zones were analyzed at 51 scan points for all states of torque. Supporting documents included specifications of the test plate, scan point and torque state information, selected resonance peaks tables, measured frequencies for seven resonance groups, correlation values for all FRF, visualizations, and code scripts.
SPECIFICATIONS TABLE
The dataset provides full-field laser-Doppler-vibrometry FRF measurements for a four-bolt aluminum plate, covering 18 torque states and packaged with documentation, processed data, images, scripts, and metadata.
- The package contains pointwise FRF exports, documentation, processed tables, images, scripts, metadata, and a packaged ZIP dataset.
- Polytec PSV-500 measurements captured pointwise H1 displacement-to-force amplitude and phase data using an automatic impact hammer.Soft sponges simulated free-free boundary conditions beneath the plate.
- 18 torque states span all bolts tight, all bolts loose, single-bolt tightening or loosening, and multiple-loose-bolt configurations.The states include one-bolt cases at 5 Nm and configurations with three or two loose bolts.
- The dataset is a full-field laser-Doppler-vibrometry frequency-response-function collection for a four-bolt aluminum plate under bolt-torque variation.
- The dataset is publicly identified as Full-field laser-Doppler-vibrometry frequency-response-function data for a four-bolt aluminum plate under bolt-torque variation.The repository is Zenodo, with DOI 10.5281/zenodo.20038951.
VALUE OF THE DATA
The data package supports systematic analysis of bolt-torque effects through shared pointwise amplitude and phase measurements, standardized frequency resolution, processed statistics, and intermediate torque cases.
- 18 selected bolt-torque combinations provide pointwise H1 amplitude and phase datasets, including single-bolt series and combined multi-loose setups.
- The 51-point common subset and 1 Hz spectral resolution support benchmarking FRF-correlation, modal assurance criterion, and FRF-shape damage-localization techniques.
- Included torque levels, scan-point coordinates, and pre-processed data tables make the dataset usable for structural-health-monitoring, modal-testing, and bolted-joint-dynamics instruction.
- Partitioned tables cover frequency-candidate detection and retention, frequency tracking, per-case statistics, and per-frequency-family statistics.This organization supports evaluating multiple selection or screening procedures without repeating the full analysis cycle.
- Intermediate 5 Nm cases provide an opportunity to investigate dose-response relationships.
BACKGROUND
The dataset separates raw torque-variation measurements from their interpretation while addressing uncertainty in bolted-joint dynamics and the need for spatially resolved benchmark data.
- The accompanying research article compares an all-tight baseline with four single-bolt loose cases using amplitude-only and phase-inclusive FRF-correlation metrics and local FRAC maps.
- The data article provides additional torque configurations from raw exports that were not included in the screening analysis.
- Bolt preload affects contact stiffness, frictional dissipation, microslip, and local boundary conditions, which can shift resonance frequencies and reshape frequency-response functions.
- Full-field laser Doppler vibrometry captures spatial redistribution of vibration across the measured surface rather than only a few discrete measurement locations.
DATA DESCRIPTION
The dataset package combines raw and processed files for full-field laser-Doppler-vibrometry measurements across 18 bolt-torque configurations. It includes common spatial sampling, resonance-tracking outputs, correlation analyses, figures, scripts, metadata, and variable documentation.
- Package organization: The package is organized into raw exports, documentation, processed tables, figures, scripts, and machine-readable metadata.The raw exports contain pointwise H1 amplitude and phase files for the 18 torque states.
- Spatial sampling: 51 common LDV points were mapped across all 18 torque states, with bolt centers, point indices, and the hammer impact point identified spatially.The point indices are used in the raw export filenames.
- Spectral products: Median spatial-RMS spectra summarize the 18 torque-state classes over frequency ranges from 1–12 kHz and 1–51 kHz.The retained resonance groups are marked in the extended-range spectrum.
- Documentation and reproducibility: The package also provides tabular-dataset summaries, a variable dictionary, eighteen exported torque configurations, dominant file types, and six Python scripts for rebuilding outputs.The scripts can rebuild processed tables, figures, and an optional HDF5 export.
- Resonance analysis: The all-tight reference spectrum supplies candidate resonance peaks, whose retention and tracking are documented with prominence, bandwidth, trackability, window, and tracked-frequency variables.The variable dictionary includes baseline and single-bolt-loose tracked frequencies.
- Correlation analyses: Processed outputs include global amplitude and phase dissimilarities, phase-only similarity, torque level, and local FRF-correlation maps for retained frequency groups.Example maps compare the all-tight baseline with four single-bolt-loose cases.
EXPERIMENTAL DESIGN, MATERIALS AND METHODS
The study measures displacement-to-force H1 frequency-response functions on a four-bolt aluminum plate using scanning laser Doppler vibrometry, then processes common scan points across torque states.
- Test setup: A four-bolt aluminum plate was tested with automated modal-hammer excitation and Polytec PSV-500 scanning laser Doppler vibrometry.The plate was supported on soft sponges to simulate free-free boundary conditions.
- Measured data: The raw exports contain pointwise H1 displacement-to-force FRFs, with amplitude reported as receptance magnitude in m/N and phase reported in degrees.Amplitude and phase files correspond to the same H1 FRF at each LDV scan point.
- FRF representation: Amplitude and phase are recombined into a complex FRF using the exported amplitude and a phase converted from degrees to radians.A_i(f) is the amplitude in m/N, while ϕ_i(f) is the phase in degrees at scan point i.
- Processing workflow: The main analysis retains the 51 coordinate points common to all 18 torque states and identifies, groups, and tracks resonance peaks.Candidate peaks are found through smoothed log peak picking, while tracking windows use a data-driven half-width criterion.
- Reproducibility: Researchers can reuse processed CSV tables and figures or reproduce the analysis from raw exports and scripts, including alternative selection and windowing criteria.The package is intended to follow FAIR data principles and support citation as a research output.
LIMITATIONS
The dataset supports analysis of one plate configuration, one boundary-condition realization, and one nominal preload range, so broader conclusions require validation elsewhere.
- Scope boundary: Conclusions from this dataset must be validated on plates with different dimensions and configurations and across a wider range of preloads before generalization.The stated scope is one plate configuration, one boundary-condition realization, and one nominal preload range.
ETHICS STATEMENT
The authors report that the work follows publication ethics requirements and involves no human subjects, animal experiments, or social-media data.
- Ethical scope: The work does not involve human subjects, animal experiments, or data collected from social media platforms.The authors state that they have read and follow ethical requirements for publication.
CRediT AUTHOR STATEMENT
The CRediT statement assigns conceptualization, methodology, software, data curation, analysis, visualization, and original drafting to Berkay Kullukcu, with Dina Hannebauer contributing supervision, resources, validation, and review.
- Berkay Kullukcu: Berkay Kullukcu is credited with conceptualization, methodology, software, data curation, formal analysis, visualization, and original drafting.
- Dina Hannebauer: Dina Hannebauer is credited with supervision, resources, validation, and writing review and editing.