NON-CONTACT EXCITATION SYSTEM TO HIGHLIGHT THE VIBRATION MODES OF BEAMS.
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| Title: | NON-CONTACT EXCITATION SYSTEM TO HIGHLIGHT THE VIBRATION MODES OF BEAMS. |
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| Authors: | Paun, Rusalin Lucian1, Gillich, Gilbert-Rainer1, Tufisi, Cristian1, Gillich, Nicoleta1 |
| Source: | Annals of 'Constantin Brancusi' University of Targu-Jiu. Engineering Series / Analele Universităţii Constantin Brâncuşi din Târgu-Jiu. Seria Inginerie. 2022, Issue 4, p32-37. 6p. |
| Subjects: | Sound pressure, Audio frequency, Systems design, Frequency stability, Computer software |
| Abstract: | We introduce in this paper a vibration-testing system designed to identify the natural frequencies of structures. The system consists of two devices: the first device is used to excite the test beams with acoustic pressure, while the second device is used to acquire, process, and store the vibration signals. The excitation is made with a signal generated using a computer program. After it is generated, the signal is sent to a loudspeaker via a computer sound board and an amplifier. The excitation force is sinusoidal and has a frequency in the audio domain. With this device, it is possible to set the generated frequency near one of the natural frequencies of the beam, so that the resonance is achieved for the given vibration mode. The excitation signal has good frequency and amplitude stability. The response signal is measured with the second device, and the frequency is estimated using an original method. It is possible to apply this procedure for each vibration mode that has the frequency in the domain defined by the speaker and the accelerometer. The test procedure is presented in detail in this paper. It is verified by applying it to a cantilever beam with a constant cross-section, for which we also calculated the natural frequencies. A good correlation between the theoretical and the measured frequency resulted. [ABSTRACT FROM AUTHOR] |
| Copyright of Annals of 'Constantin Brancusi' University of Targu-Jiu. Engineering Series / Analele Universităţii Constantin Brâncuşi din Târgu-Jiu. Seria Inginerie is the property of Universitatea Constantin Brancusi din Targu-Jiu and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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