A case study: Monitoring heat exchanger based on vibration sensors and nondestructive testing technique
Flow-induced tube vibration could cause serious damage on large-scale circulating-water heat exchanger in factories, e.g., atomic reactors, nuclear power plants, petroleum and chemical industry. Therefore, efficient inspection technology is very important for heat exchanger's blockage and leakage. The existing detection technologies, like temperature test and pressure test, are very easily affected by extraneous factors, e.g., temperature and pressure, while the nondestructive testing technology based on vibration sensors is free from above limits. In this paper, we use vibration sensors to detect blockage and leakage of the circulating-water heat exchanger. According to the experimental results, it is found that when detecting heat exchanger's blockage and leakage with vibration sensors, environmental vibration from the working machines has influence upon the result, while pump vibration and vibration produced by liquid flowing through regulating-valve make little difference. Nevertheless, fault diagnosis of large-scale circulating-water heat exchanger, which uses nondestructive testing technology based on vibration sensors, needs to be further improved.
Using Wireless Vibration Sensors to Study the Impact of Fouling on Fluid-Conveying Pipelines
This paper analyzes the vibration signals on the surface of the fluid-conveying pipelines so as to monitor the state of pipelines, and study the impact of fouling on these pipelines. Wireless acceleration sensors are deployed on pipelines’ surfaces to detect the vibration signals under different states. According to the real data from the test experiments, a model is implemented in ANSYS. On this basis, extensive simulation is conducted. The simulation results compare with real test data to verify the efficiency of the model.
Rotary Machine Fault Diagnosis Based on Spectrum Analysis Method
Rotary machine fault diagnosis technology based on spectrum analysis method is one of the device diagnostics technologies developing with industry develop.On the premise of ensuring high speed arithmetic,how to improve precision of signal processing is a keystone in vibration signal processing.FFT-FT algorithm can increase effectively operation precision.Vibration test and fault analysis of the large-scale key rotators machine unit based on spectrum analysis method can realize real-time diagnosis conveniently and accurately.It can save abundant maintenance costs.It has tremendous development potential in the rotary machine fault diagnosis field.