相对衰减系数 meaning in English
relative damping coefficient
Examples
- The study shows that using a obtained from cylindrical surface of column can characterize the alloy steel samples , which have complicated phase structure
研究表明，通过比较圆柱面法测得的相对衰减系数，能够对具有多种相结构的较大尺寸合金钢试样进行超声表征。 - The three methods are independent , supplement mutually and proved each other because the sensibility of every method is different when used to distinguish different microstructures
超声波速度、相对衰减系数及功率谱分析三种方法，各自独立；同时，三种方法区分不同组织的灵敏度不同，实验结果能够互为补充。 - 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。