An Efficient Natural Frequency-Based Method for Crack Identification in Beams
Main Article Content
Abstract
In recent years, frequency-based damage detection methods have attracted considerable research interest due to their cost-effectiveness, ease of implementation, and capability to detect structural damage. Such methods can be employed to localize and quantify damage by analyzing changes in natural frequencies. This paper presents a deterministic frequency-based crack identification method for beams. The crack is modeled as a massless rotational spring, and both the crack location and the associated stiffness reduction are identified through a computational procedure that exploits the analytical relationship between modal parameters and local stiffness variations. The proposed formulation employs multi-mode aggregation using the first three natural frequencies together with a modal calibration (“zero-setting”) procedure, which improves robustness with respect to modeling discrepancies. To validate the proposed approach, a MATLAB-based program has been developed incorporating six different static schemes. The method is evaluated using data obtained from finite element models with various crack locations and severities. For beams with a rectangular cross-section, the program additionally enables estimation of crack depth. The results indicate that the proposed method allows accurate prediction of both crack location and severity when damage induces measurable changes in natural frequencies.
Downloads
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Journal author rights
In order for Romanian Journal of Acoustics and Vibration to publish and disseminate research articles, we need publishing rights. This is determined by a publishing agreement between the author and Romanian Journal of Acoustics and Vibration. This agreement deals with the transfer or license of the copyright to Romanian Journal of Acoustics and Vibration and authors retain significant rights to use and share their own published articles. Romanian Journal of Acoustics and Vibration supports the need for authors to share, disseminate and maximize the impact of their research and these rights, in Romanian Journal of Acoustics and Vibration proprietary are defined below:
For subscription articles:
Authors transfer copyright to the publisher as part of a journal publishing agreement, but have the right to: Share their article for personal use (manuscript version); retain patent, trademark and other intellectual property rights (including research data); proper attribution and credit for the published work.
For open access articles:
Authors sign an exclusive license agreement, where authors have copyright but license exclusive rights in their article to the publisher. In this case authors have the right to: share their article in the same ways permitted to third parties under the relevant user license; retain patent, trademark and other intellectual property rights (including research data); proper attribution and credit for the published work.
Rights granted to Romanian Journal of Acoustics and Vibration
For both subscription and open access articles, published in proprietary titles, Romanian Journal of Acoustics and Vibration is granted the following rights:
- The exclusive right to publish and distribute an article, and to grant rights to others, including for commercial purposes;
- For open access articles, Romanian Journal of Acoustics and Vibration will apply the relevant third party user licence (Open access licencses) where Romanian Journal of Acoustics and Vibration publishes the article on its online platforms;
- The right to provide the article in all forms and media so the article can be used on the latest technology even after publication;
- The authority to enforce the rights in the article, on behalf of an author, against third parties, for example in the case of plagiarism or copyright infringement.