【摘要】 基于随机介质的衰减理论 ,分析超声波在煤中的传输特性 ,采用了漫射近似方法建立了超声波传输过程中由衰减规律的理论模型。在理论模型的基础上建立了对象的仿真模型 ,用以研究衰减特性和传播距离、超声波频率湿度 ,以及煤粉颗粒浓度的关系。通过对仿真试验的分析和比较 ,证明了模型的正确性 ,该仿真模型能用于超声波在煤粉中的传输特性的分析。更多还原

【Abstract】 This paper, which is based upon the attenuation theory of random media, analyzes the transmission characters of ultrasonic in coal, and adapts The Diffusion App roximation Theory to build the theory model which reflects the attenuation of tr ansmission process. We build the simulation model on the theory model in order t o study the relationship between attenuation characters and transmission distanc e, frequency, humidity and density of coal and justify the model by analyzing an d comparing the outcome of simulation trial. The simulation model can be use to analyze the transmission characters Ultrasonic in coal.更多还原