基于PC机材料力学微应变自动检测方法研究

Research on weak strain auto-detecting method in material of mechanics based on PC

材料力学微应变测量实验中,试件在较小负荷作用下所产生的应变信号十分微弱,而各种噪声较被测应变信号强很多倍,因此在信号检测时要设法提高信号的信噪比。实验证明常规的信号检测方法不能够有效地检测出有用信号,这就要求采用微弱信号检测的方法来对被测信号进行处理以实现微弱应变信号的有效检测。

In the strain-data measured experiments of material of mechanics, the bar generates weak strain signal by the less force functioning on the bar, while the noises are much stronger than the signal, so people must take measures to improve the S/N when measuring the signal. The traditional method is not able to efficiently measure the weak strain signal, as it is proved by the experiment. In order to improve the S/N, the method of weak signal measuring is essential for the measurement to detect the weak signal.