1) Reduce the shell line speed, when the flow can not change, you can increase the tube core distance or increase the shell diameter.
2) To improve the natural frequency of the pipe, the effective way is to shorten the maximum span length of the pipe without support or change the pipe and increase the wall thickness, but the effect is not as significant as method 1).
3) Change the baffle form or use the baffle rod, and also change the pipe arrangement under the premise of meeting the heat transfer and pressure drop.
4) When the nozzle vibrates, the diameter of the nozzle can be increased.