Abstract
Compared with the general environment, the modal characteristics of structures under fluid-solid coupling will show great differences. Reasonable experimental methods can provide reliable conclusion support for fluid-solid coupling research. In order to explore the modal characteristics of structures under the action of fluids, the interference and finite element numerical calculation methods are used to study the dry and wet modal characteristics of the cantilever aluminum plate under fluid-solid coupling. According to the amplitude fluctuation resonance discrimination method, the resonant frequency and mode of the cantilever aluminum plate under different working conditions are obtained accurately. Experiments show that the effect of the fluid will greatly reduce the natural frequency of the structure and have little effect on the vibration mode. With the gradual increase of the fluid-solid coupling interface, the natural frequency drop rate and the amplitude at the gas-liquid interface remain consistent, and slightly ahead of the amplitude characteristics. At the same time, for each mode with the same characteristics, the frequency decreasing trend is linear, such as the first few pure bending vibration modes, and the first few bending and twisting combined vibration modes contain first-order twisting vibration. The experimental results and the finite element numerical results are in good agreement, which shows that the electronic speckle method is a good test method for studying fluid-solid coupling modes. Most importantly, the experimental conclusion has reliable reference value for practical engineering applications.
Highlights
The modal analysis technology originated in the 1930s and was first applied to the measurement of aircraft modal parameters in the aviation field
The experimental frequency takes the average of two cantilever aluminum plates
The experimental mode and finite element calculation results are basically the same, and the frequency error is less than 2 %, indicating that the electronic speckle test method has good reliability and accuracy
Summary
The modal analysis technology originated in the 1930s and was first applied to the measurement of aircraft modal parameters in the aviation field. Especially the maturity of sensor technology, modal analysis has developed rapidly, which has become an important part of the field of vibration engineering [1]. The structure cannot exist independently from the fluid environment. According to the influence of fluid, the modal analysis can be divided into two types: dry modal analysis and wet modal analysis. Dry modal analysis generally ignores the effects of light fluids, and the default structure is calculated in a vacuum environment. The wet mode problem must consider the influence of the additional fluid on the vibration characteristics of the structure. For the small deformation problem, to simplify the calculation, the fluid can be applied to the structure as an additional mass for analysis [2, 3]. The interaction between fluid and structure is a fluid-solid coupling problem [4]
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