Deficiency ultrasonic detecting equipment of mechanical equipment based on wavelet theory

Abstract

The invention discloses deficiency ultrasonic detecting equipment of mechanical equipment based on wavelet theory, the whole equipment is composed of an ultrasonic flaw detector, a high-speed data acquisition system, a minitype computer, a wavelet analysis software, an equivalent quantitative model for detecting signals and an equipment safety performance evaluation system. The ultrasonic flaw detector comprises a synchronous circuit, a transmission circuit, an ultrasonic detecting energy converter, a signal receiving circuit which are connected, the high-speed data acquisition system adopts a high-performance digital storage oscilloscope and comprises a synchronous trigger, a gain position adjustment part, a data acquisition mode and time base part, a waveform recording part and a display part and the other parts, the computer is allocated with a wavelet analysis integration software which is self-developed, the equivalent quantitative model for detecting signals and a safety evaluation theoretical model. The invention breaks through the application limits of the traditional ultrasonic flaw detector, effectively improves the sensibility and measuring accuracy of flaw detection and provides novel equipment and a new method for the ultrasonic detecting problems with complex structure. The equipment has convenient usage and high engineering application value.

Description

Technical field: [0001] The invention relates to ultrasonic flaw detection equipment in nondestructive testing. Background technique: [0002] Imperfection refers to the deviation from the technical requirements, and refers to the inhomogeneity and discontinuity of the structure. Deficiency is a special term specified by the International Institute of Welding (IIW) in the IIW / IIS-SST-1157-90 document, which mainly includes: ① changes in microstructure, such as decomposition and graphitization of pearlite; ② corrosion thinning, corrosion The size of the pit; ③The nature of the defect (cracks, pores, slag inclusions, looseness, etc.), size, etc. [0003] The above three main categories of defects actually determine that the detection of defects should consider three main directions, namely three aspects of organizational change, corrosion and defects. Ultrasonic is the most active and fastest-growing non-destructive testing technology in recent years. It has a series of adv...

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Problems solved by technology

However, these studies are only limited to extracting the ultrasonic detection signal, applying corresponding mathematical tools to program and process the signal, which is not only time-consuming, but also not suitable for on-site use.

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