Vibrações: As Frequências Naturais Estimada E Experimental De Uma Estrutura

Bolina, C.C.; Palechor, Erwin Ulises Lopez; Vásquez, M. P. R.

doi:10.5151/mathpro-cnmai-0038

Cited by 6 publications

(5 citation statements)

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“…The natural frequencies of a system represent how freely a mechanical component or structure vibrates after the applied external force has been stopped, and may have multiple natural frequencies in various directions. For dynamic study, the most important resonance frequency is the first, called fundamental, it is the smallest of all and is always the one that prevails more in the oscillatory movement [5] .…”

Section: Multiple Degrees Of Freedom Systemsmentioning

confidence: 99%

Dynamic analysis of a free vibrating cantilever beam

Janchikoski,

Meireles

2023

Revista Científica Multidisciplinar Núcleo do Conhecimento

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This paper has as subject a theoretical, numerical and experimental study of the behavior of a 1.5 meters long and cross section of 0.02 meters wide and high beam. The main objective was to analyze a structure, in this case it was a cantilever steel beam, to establish the possible solutions that best define the behavior of this structure, to obtain the results and to prove the veracity of the results obtained by means of an experimental analysis method. In this sense, essential theoretical foundations were used for the understanding and realization of the mathematical formulations of this project, in order to obtain the analytical results of the vibration modes of the beam and respective natural frequencies. To complement the analysis of the beam behavior, the finite element method procedure was applied using the ansys software to obtain more accurate results. The results obtained for the beam from these two methodologies include bending modes among the first 10 degrees of freedom. To validate the study done previously a physical model of the beam was used for the experimental test, for this it was defined that the equipment for measuring the resonance frequencies would be a digital stroboscope, enabling the measurement of only 8 vibration modes due to its small frequency range.

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Section: Multiple Degrees Of Freedom Systemsmentioning

confidence: 99%

Dynamic analysis of a free vibrating cantilever beam

Janchikoski,

Meireles

2023

Revista Científica Multidisciplinar Núcleo do Conhecimento

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“…According to Bolina et al [13], the natural frequencies (fn) indicate the rate of free oscillation of the structure, after ceasing the force that caused its movement. In other words, it represents how much the structure vibrates when there is no longer a force applied to it.…”

Section: Modal Analysismentioning

confidence: 99%

Fiber-Metal Laminate Panels Reinforced with Metal Pins

Reis¹,

Skhabovskyi²,

Santos³

et al. 2019

Optimum Composite Structures

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Fiber-metal laminates (FMLs) are key to modern composite structures and metal-composite coupling is crucial to improve their effectiveness. Cold-metal transfer (CMT) PIN welding, in correlated efforts, has been successfully explored as a metal-composite hybrid joining approach. This work proposes a novel development on FMLs, which consists of introducing metal pins welded by CMT PIN for anchoring their metal and composite layers together. Thus, miniaturized FML panels with different pin deposition spacing and patterns are evaluated with emphasis in drop-weight testing followed by buckling and by means of Iosipescu shear test as complement. They are also subjected to cosmetic and preliminary modal analyses. Besides not adding significant weight, the pins does not make the panels more brittle and their distribution does not imply significant effect in the capacity that the panels have to dissipate impact. The panels with pins exhibit a less catastrophic trend, indicating damage tolerance improvement as significantly higher loads at longer axial displacements in buckling test after impact are achieved. The anchoring effect of the pins is confirmed throughout the shear test results. The pins also significantly increase the damping factor of the panels and the changes in their metal surfaces by the CMT PIN process are considered as irrelevant.

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“…Vibration modes are the way the structure vibrates, related to each of its natural frequencies. That is, for each natural frequency, there is a speci c vibration mode or vibration pro le [10].…”

Section: Introductionmentioning

confidence: 99%

Variation of the vibrational treatment on mechanical properties and weld residual stress

Serrati,

Silva,

de Souza

et al. 2024

Int J Adv Manuf Technol

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There are several ways to relieve welding residual stresses. The most commonly used and the only standardized method is the post weld heat treatment. However, this method is time-consuming and costly, which necessitates exploring other approaches that can ensure satisfactory results in a faster and more economical manner. In this context, relief of residual stresses through vibration has been gradually adopted by the industry. Therefore, this study aims to relieve welding residual stresses in thick plates to evaluate whether the position of the excitation source, whether parallel or coincident with the welded plates, in uences the expected results. Additionally, it seeks to determine whether the best results are obtained when vibration stress relief is performed simultaneously with welding or after the completion of the process. Furthermore, the results of residual stress measurements using the blind-hole method are provided, and mechanical tests are conducted to determine the in uence of these processes on mechanical properties. The results indicated that vibration performed after welding is more e cient and the position of the vibration motor has a signi cant in uence on the results. Furthermore, it was observed that the stress relief process only impacted toughness, without signi cantly altering other mechanical properties.

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Vibrações: As Frequências Naturais Estimada E Experimental De Uma Estrutura

Cited by 6 publications

References 0 publications

Dynamic analysis of a free vibrating cantilever beam

Dynamic analysis of a free vibrating cantilever beam

Fiber-Metal Laminate Panels Reinforced with Metal Pins

Variation of the vibrational treatment on mechanical properties and weld residual stress

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