Method for establishing pressure intensity-ultrasonic reflectivity curve for pressure intensity detection on joint surface

Abstract

The invention discloses a method for establishing a pressure intensity-ultrasonic reflectivity curve for pressure intensity detection on a joint surface. The method comprises the following steps: firstly, calculating the ultrasonic reflectivity of each scanning point under different pressure intensities, subsequently fitting to calculate the initial pressure intensity-reflectivity relationship, calculating the pressure intensities of all scanning points under different pressures according to the initial pressure intensity-reflectivity relationship, so as to obtain the pressure F of the whole joint surface; calculating a calibration coefficient according to F and the actual pressure F0 measured through a pressure sensor, subsequently recalculating a pressure intensity value Pi of each scanning point to obtain a modified pressure intensity value Pi', calculating an average value P<alpha> of the pressure intensity value Pi' of the scanning points in a central pressure intensity distribution flat area of the joint surface under different pressures, refitting according to the obtained P<alpha> and an average reflectivity value R0 corresponding to the area so as to obtain a novel pressure intensity-reflectivity curve. According to the method, the pressure intensity-reflectivity curve is established in an iteration mode, the accurate pressure intensity-reflectivity is established, and accurate detection on the contact pressure intensity of the joint surface is achieved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic detection, and relates to the construction of a pressure-reflectance curve, in particular to a method for constructing a pressure-ultrasonic reflectance curve for joint surface pressure detection. Background technique [0002] The large number of bonds present in a mechanical system can have a significant impact on system performance. With the increasing refinement of high-end equipment manufacturing and assembly processes, it is particularly urgent to realize accurate detection of contact pressure distribution on joint surfaces. However, due to the closed nature of the joint surface, it brings many difficulties to the experimental measurement. At present, there are mainly thin-film method and ultrasonic method for measuring the contact pressure distribution of joint surface. Among them, the thin-film method is to insert a thin-film sensor with a certain thickness between the joint surfaces, ...

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Problems solved by technology

However, due to the inaccuracy of the pressure-reflectivity curve constructed by the current method, there is a large gap between the detection results of the ultrasonic method and the calculation results of the theoretical model, and the detection accuracy is low.

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