With 1kHz voltage modulation and harmonics detection, residualamplitude modulation (RAM) noise were carried out experimentally.
从理论和实验上研究了残余幅度噪声（RAM）对谐波探测的影响。
2
The damage variable is defined as the residual strain of concrete under constant amplitude fatigue loading, and the law of cumulative damage and its evolution are obtained.
由等幅疲劳残余应变，定义了损伤变量，得到了相应的损伤积累和演化规律。
3
By means of the experimental data from dynamic triaxial stress-strain test of variable cyclic amplitude for frozen soil, the formative conditions of residual strain on frozen silt clay are studied.