Effect of Boundary Condition on Dynamic Response During Thermal–Acoustic Test
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To investigate the effects of the temperature distribution and the change of the boundary condition on vibration response of the panel under combined thermal–acoustic loads.
Both thermal–acoustic tests and numerical simulation were carried out on a titanium flat plate. Two methods are used to equivalent the change of the testing boundary condition. One is using spring to replace the freedom. Another way is adding the force in that direction.
The results show that when the boundary condition is ideally fixed, with the increase of the temperature, the trends of the modal frequencies for uniform and non-uniform temperatures are almost the same. As the increase of the temperature, the first modal frequency is reduced to zero before the critical buckling temperature, and then, the frequency will be increased. The temperature distribution will affect the critical buckling temperature. For the different boundary condition, the results show that, with the reduction of the spring stiffness, the critical buckling temperature is increased, and the trends of the modal frequencies are similar. However, with the increase of the in plane force, the modal frequencies will reduce.
The results show that the temperature distribution has a little effect on the modal parameters. Compared with the temperature distribution, the boundary condition has much more influence. Therefore, much care needs to be taken to design the fixture during thermal–acoustic tests.
KeywordsThermal–acoustic Modal parameters Vibration response Temperature distribution Boundary condition
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