论文部分内容阅读
在一些重要场合，需要实地监测螺栓中的轴向力，利用超声波监测螺栓轴向力的方法，国内外陆续有人研究，但一般认为尚未进入实用化阶段。本文介绍的“超声测力仪”是研究实用型数字直读式超声波螺栓轴力监测仪器的初步尝试。本仪器采用的是一种反射—振荡器型超声频谱仪（ＲＯＵＳ），它由特殊形式的收—发一体化换能器和选通放大器构成基本振荡环节，其振荡频率随被测螺栓内的轴力而变。试验结果表明：针对被紧固工件的公称尺寸将仪器调节好之后，螺栓内的轴向力与频率变化量之间呈较好的线性关系，仪器可将螺栓轴向力直接以公斤值指示出来。
In some important occasions, the need to monitor the axial force in the field bolts, the use of ultrasonic monitoring of bolt axial force method, some people have studied at home and abroad, but generally considered not yet into the practical stage. This article describes the “ultrasonic dynamometer” is a practical attempt to study digital direct-reading ultrasonic bolt axial force monitoring instruments. The instrument uses a reflection - oscillator type ultrasonic spectrometer (ROUS), which consists of a special form of integration of the transmitter and receiver transducers and gating amplifiers constitute the basic oscillation, the oscillation frequency with the bolt under test Axial force changes. The experimental results show that after the instrument is adjusted according to the nominal size of the fastened workpiece, there is a good linear relationship between the axial force and the frequency variation in the bolt. The instrument can directly indicate the bolt axial force in kilograms .