relative attenuation meaning in Chinese
相对衰减
Examples
- Complex relative attenuation
复数相对衰减 - For example , the quenching and quenching plus low tempered structure of 38crmoal are hard to be differentiated by velocity method and the principal frequency technique . it will be better if they are differentiated by the method of relative attenuation coefficient
38crmoal钢的淬火与淬火+低温回火组织，用声速法和主频率比较法都难以区分，最好的方法是比较功率谱谱峰特征(幅度、数量、分布) 。 - The difference among the elasticity modulus of various microstructures is probably the main reason , which caused the experiment results above . under the same experiment conditions , such as sample shape , size , surface roughness , establishment of testing system , pressure on the probe , and thickness of coupling medium , the variety of relative attenuation coefficient ( or ) in different heat treatment samples is measured and compared by measuring the attenuation obtained from the cylindrical surface of column . the result is as following : for 40cr and 38crmoal , a mt < az mq < a s < a p + f ; for gcrlssimn , a mt < a annea < s < a p + f ; and a increased with the increasing of frequency
在保证试样形状、尺寸、表面光洁度、系统参数设置、施加在探头上的压力以及耦合层厚度等测试条件一致的情况下，利用棒材圆柱面测衰减系数法，分别测定并比较上述不同热处理试样相对衰减系数的变化情况，得到的实验结果是：对于40cr及38crmoal钢， _ (低温回火) (淬火) _ (高温回火) _ (正火) ；对于gcr15simn钢， _ (低温回火) _ (退火) _ (高温回火) _ (正火) ；且随着频率的提高，衰减系数均呈现增加的趋势。 - According to structural characteristics of multi - phased alloy steels and the properties of ultrasonic propagation , microstructures characterization with different heat treatment processes ( normalizing , quenching / annealing , quenching plus low tempering , quenching plus high tempering ) for three steels ( 40cr , 38crmoal , gcrlssimn ) was studied experimentally by using ultrasonic methods . ultrasonic velocity , relative attenuation coefficient , and power spectral analyses were researched on the same samples respectively , on the basis of theory and experiment , the sensitivity and other characterizations of the three methods used to distinguish different microstructures were compared
根据具有多种相结构合金钢不同热处理转变产物的组织特点，以及超声波在其中的传播规律，利用超声波速度、相对衰减系数以及功率谱分析三种方法，对三种钢( 40cr 、 38crmoal及gcr15simn )不同热处理(正火、淬火退火、淬火+低温回火及淬火+高温回火)转变产物的显微组织进行了超声表征研究。