Research on model testing of a new ultrasonic multi-wav detecting method

The traditional crack exploring method with echo (reflected wave) in metals is called the ″single-wave de-tecting method″ that uses a probe of single weight. This method is not able to detect directly the size and shape of the crack and the result can only be obtained by relative comparison, that is to compare the echo amplitudes of the unknown quantity (crack) with the known quantity (regular artificial crack) to determine the equivalent size and shape of a certain crack. In this way, the s…     

铁路路基关键参数长期监测方法与系统的研究

提出一种路基表面沉降和动位移光学测量方法,具有自动标定等优点,在此基础上构建了基于无线网络传输铁路路基关键参数远程监测系统。该系统主要由路基动位移自动测量、表面沉降自动测量、路基动应力与含水量自动测量以及数据采集与无线传输等部分组成。监测系统经实验室验证后,分别在大秦重载铁路大同路段以及茶坞路段进行了现场安装调试和实验,实现了对路基含水量、动应力、动位移和沉降的长时间自动远程监测。     

超声多波检测新方法模型试验研究

传统金属回波(反射波)探伤法,我们称之为"单波检测法",用的是单分量探头.此方法不能直接检测伤的大小和形状,只能采用相对比较的方法,即用未知量(伤)与已知量(规则的人工伤)的回波振幅相比较的方法,来确定伤的当量大小和形状.此方法可以基本确定伤的位置,但不是实际伤的大小、形状和位置,不能满足实际部门的需要.下面引入新方法,即"多波检测法".这一新方法能直接检测伤的大小、形状和位置.     

Research on model testing of a new ultrasonic multi-wave detecting method

The traditional crack exploring method with echo （reflected wave） in metals is called the ＂single-wave detecting method＂ that uses a probe of single weight. This method is not able to detect directly the size and shape of the crack and the result can only be obtained by relative comparison, that is to compare the echo amplitudes of the unknown quantity （crack） with the known quantity （regular artificial crack） to determine the equivalent size and shape of a certain crack.