The Research On The Acoustic Design Sensitivity And Dynamic Optimization

What the traditional way of acoustic design lack of is that it often put more attention on the other aspects but not the sound and vibration part. So when the structure parameters is already confirmed, but find that the acoustic-performance is not satisfied. At this time we have to reconsidered the structure parameters or use the passive reduction noise measures etc: add damping, enhance the structure stiffness and so on to meet our needs. This will increase the cost of experiment and extend the design cycle.ADS stands for the derivate of acoustic parameters to the design parameters. It simply represents the influence of the design parameters to the acoustic parameters. So the effective method of reducing vibration and noise must be calculate the ADS at the beginning it helps the engineers to know how to reduce the structure vibration and sound radiation. In addition dynamic optimization will help us to find out the sensitive frequency and avoid it. It will give a lot help also.At this paper, based on the theory of FEM and BEM, the natural frequency sensitivity, the frequency response displacement sensitivity, ADS is deduced. The structure sensitivity of the ring-stiffened cylindrical shell is calculated first. Then the model element information and result file is introduced to the BEM program to calculate the ADS and verify the reliability. Finally the gradient method and the DOE method is respectively used to do the optimization of the structure natural frequency.