The Analysis And Design Of Ultrasonic Cavitation Detection Platform

Cavitation erosion phenomenon of metal material mainly occurs in the devices under the condition of fluid medium, it has become one of the key issues which need to be resolved in the domain such as water conservancy, aerospace due to its wide destructions. However, cavitation process is relatively complex and involves multiple cross domains, there is no complete cavitation research system in domestic and abroad. So developing high-performance anti-cavitation material that adapt to the specific condition, it has become one of hotspots in the field of materials science at present. In the paper, ultrasonic vibration device was used to simulate cavitation erosion. At last, we analyzed cavitation test of several kinds of materials, trying to provide scientific basis for the cavitation performance of different materials.In the paper, cavitation-detecting system was proposed, it mainly consists of ultrasonic vibration system, temperature controlling system and Level feedback system modules. Firstly, the current status of cavitation detection research was analyzed and an ultrasonic vibrating device for simulate cavitation effect was designed, we focus the design of frequency-matching-system and the algorithms of frequency researching and tracking. To satisfy the needs of temperature and tested fluid, thermostat and feedback system are designed respectively. Finally, we analyzed the centralized erosion test through running the platform, the main method is as follows:1. Introducing dynamic matching system based on traditional static model, obtaining the dynamic coupling point using Oscillation Theory. In terms of algorithms, taking integral separation PI algorithm to adaptive frequency in the process of frequency searching and tracking.2. At the aspect of temperature controlling, calibrating the sensitivity of sensor and then making fuzzy PID control between actual values and set values, thus to make sure the constant temperature at the second constant field.3. For volatile situation in the process of cavitation test, quantifying the level of liquid with help of gravity sensor and control the valve status through output signal, on these basis, adding feedback controlling system to achieve auto-supplement of testing liquid.4. Weight loss method and scanning the sample surface roughness were used to analyze cavitation degree of metal materials. In the end, we get the anti-cavitation performance of different metal materials under the conditions of fluid medium.