Interface Pressure Detection Method of Cable Silicone Rubber Based on Nonlinear Ultrasonic
The interface pressure between a cable and its accessories plays a decisive role in the long-term stable opera-tion of the cable.The pressure sensor measurement method can damage the interface insulation characteristics,thus a non-destructive testing method based on ultrasonic non-linear effects was proposed.Firstly,the propagation characteris-tics of ultrasonic waves at the silicone rubber-cross-linked polyethylene interface were analyzed.The relationship between the non-linear coefficient and the interfacial pressure was obtained.Then a non-linear ultrasonic test platform was built based on the pulse reflection method.Moreover,the interface pressure of flat silicone rubber and cross-linked polyeth-ylene was examined by non-linear ultrasonic testing.Both theoretical and experimental results show that,as the interface pressure increases,the interface primary echo amplitude decreases,the echo time decreases,and the non-linear coefficient increases.The results show that non-linear ultrasound can effectively evaluate the interfacial pressure state of cable sili-cone rubber composite,which can provide strong support for the subsequent interfacial pressure detection of the curved structure of cable accessories.
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维普
