To download the data set of vibration of a bolted joint structure from UNESP SHM Lab, please fill the form:

https://forms.gle/2PUVefGLegZbkpKt5

The experimental test rig is nonlinearly dependent on excitation amplitude, presenting the friction joints' well-known softening effect. The structure presents data variation related to the presence of uncertainties in the measurement process. The experimental measurements were conducted through different days, and only the tightening torque in the joint connection was controlled after each experimental realization by a torque wrench. The dataset consisted of vibration tests performed for three different tightening torques: 5, 7, and 9 Nm. The tightening torque on both bolts was always the same for each realization.

The figure above presents the joint structure investigated. The test rig comprises two aluminum beams, each with dimensions of 270 mm x 25.4 mm x 6.35 mm, and assembled by a bolted-joint connection. The structure's excitation was conducted by a Modal Shop 2400E shaker located at 85 mm from the clamped end of the cantilever beam to minimize shaker/structure interaction. Due to observability purposes for modeling the structure's first vibration mode, the system output was measured at the free end of the beam, using a laser vibrometer Polytec OFV-525/5000S. The schematic top view of the experimental setup is shown below.

The data acquisition system was the LMS SCADAS. Several excitation tests were conducted on the structure:

For the stepped sine test, the different levels of input amplitude 0.05 V (low), 0.10 V (medium) and 0.15 V (high), for the frequency range 3 to 23 Hz, and 0.01 V (low), 0.05 V (medium) and 0.10 V (high), for the frequency range 85 to 105 Hz, were supplied in the shaker amplifier. These signals were measured with a sampling frequency of 1600 Hz. For the other tests, the levels of input amplitude were 0.05 V, 0.10 V, 0.15 V, 0.20 V, 0.25 V and 0.30 V. These signals were measured with a sampling frequency of 1024 Hz. This experimental setup regards the shaker amplifier's voltage as the excitation signal since it is easier to keep this signal constant over a frequency range.

The data are still available for non-commercial research under the following terms: (i) the SHM Lab at UNESP/Ilha Solteira should be acknowledged as the source of the data; (ii) in publications, relevant publications by members of the SHM Lab at UNESP/Ilha Solteira should be cited; (iii) this benchmark should be cited as UNESP-BERT.

This dataset was used in these papers:

If you are using a LaTeX Editor, you can cite the papers above using these BibTeX citations:

@article{DEOLIVEIRATELOLI2021107751,
title = {On the use of the GP-NARX model for predicting hysteresis effects of bolted joint structures},
journal = {Mechanical Systems and Signal Processing},
volume = {159},
pages = {107751},
year = {2021},
issn = {0888-3270},
doi = {https://doi.org/10.1016/j.ymssp.2021.107751},
url = {https://www.sciencedirect.com/science/article/pii/S0888327021001461},
}

@InProceedings{10.1007/978-3-030-60694-7_4,
author="Pereira Miguel, Luccas and Oliveira Teloli, Rafael de and Silva, Samuel da",
editor="Balthazar, Jos{\'e} Manoel",
title="Harmonic Balance of Bouc-Wen Model to Identify Hysteresis Effects in Bolted Joints",
booktitle="Vibration Engineering and Technology of Machinery",
year="2021",
publisher="Springer International Publishing",
address="Cham",
pages="65--79",
}

@article{TELOLI2021107333,
title = "Bayesian model identification of higher-order frequency response functions for structures assembled by bolted joints",
journal = "Mechanical Systems and Signal Processing",
volume = "151",
pages = "107333",
year = "2021",
issn = "0888-3270",
doi = "https://doi.org/10.1016/j.ymssp.2020.107333",
url = "http://www.sciencedirect.com/science/article/pii/S0888327020307196",
author = "Rafael de O. Teloli and Samuel {da Silva} and Thiago G. Ritto and Gaël Chevallier",
keywords = "Hysteretic systems, Higher-order frequency response function, Volterra series, Jointed structures, Bayesian identification",
}

@article{miguel2020some,
  title={Some practical regards on the application of the harmonic balance method for hysteresis models},
  author={Miguel, Luccas Pereira and de Oliveira Teloli, Rafael and da Silva, Samuel},
  journal={Mechanical Systems and Signal Processing},
  volume={143},
  pages={106842},
  year={2020},
  publisher={Elsevier},
  doi = {https://doi.org/10.1016/j.ymssp.2020.106842}
}

@article{teloli2019new,
  title={A new way for harmonic probing of hysteretic systems through nonlinear smooth operators},
  author={Teloli, Rafael de O and da Silva, Samuel},
  journal={Mechanical Systems and Signal Processing},
  volume={121},
  pages={856--875},
  year={2019},
  publisher={Elsevier},
  doi = {https://doi.org/10.1016/j.ymssp.2018.11.044}
}

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São Paulo Research Foundation (FAPESP), grant numbers 16/21973-5, 18/14528-0, 19/06540-3, 19/19684-3, Brazilian National Council for Scientific and Technological Development (CNPq), grant number 306526/2019-0, and Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES)-Finance Code 001 funded this experimental setup.