Abstract:The contact vibration measurement method has application limitation in the flow induced vibration test of the tube bundle. To solve this problem, a new measurement device, named as the differential pressure vibration measurement device, is designed. Based on the principle of measuring the pressure differential fluctuation frequency on both sides of the heat exchange tube, the differential pressure type vibration measuring device can measure the excitation frequency of the external fluid force of the heat exchange tube. Differential pressure vibration measurement device solves the problem of interference of the traditional contact sensor to the external flow field of the heat exchange tube and the problem of limited installation space. To verify its effectiveness, the single tube flow induced vibration test and the heat exchange tube bundle flow induced vibration test are carried out respectively. Experimental results show that the designed device can accurately capture the frequency of all kinds of vibration forms of the heat exchange tube in the complex flow environment, including pump vibration, natural vibration, periodic vortex vibration and twophase flow vibration characteristics. Experimental results of single tube flow induced vibration test show that the periodic vortexinduced vibration frequency measured by the designed device is within 5% of the theoretical value. Therefore, the development and application of the differential pressure vibration measuring device is of great significance for the measurement of the flowinduced vibration test and the longterm monitoring of the vibration of the heat exchange tube.