根据系统的特征进行故障诊断往往因为故障的信息不足而难以确诊。将人工智能的思想引入故障诊断的理论之中以克服信息的不足和有效地利用专家知识,是一种解决故障诊断难题的有效方法。结合灰色定性仿真理论和R e iter R的基于第一原理...根据系统的特征进行故障诊断往往因为故障的信息不足而难以确诊。将人工智能的思想引入故障诊断的理论之中以克服信息的不足和有效地利用专家知识,是一种解决故障诊断难题的有效方法。结合灰色定性仿真理论和R e iter R的基于第一原理的故障诊断理论的定性定量故障诊断理论被提出,它根据系统的现实状态与用灰色定性仿真预测的系统的状态的差异判断系统是否发生了故障,若故障出现,通过故障状态与故障模型的匹配确定故障的类型。这种方法能有效地结合的定性信息和定量信息,根据系统有限的定量信息建立其变量间的定性约束并将其应用于故障诊断。展开更多
Tephra fallout is an important type of hazard caused by explosive volcanic eruption, and numerical simulation has become a fast and effective approach to assess the dispersion and deposition of tephra fallout. Accordi...Tephra fallout is an important type of hazard caused by explosive volcanic eruption, and numerical simulation has become a fast and effective approach to assess the dispersion and deposition of tephra fallout. According to the improved 2D diffusion model of Suzuki （ 1983）, we edited a tephra diffusion program that can run in the Windows system. Based on previous data, we simulated the diffusion scope of the Jinlongdingzi volcanic eruption, which is the latest eruption in the Longgang volcanic cluster. The simulated results are in good agreement with the results from measurement in situ, indicating that the model is reliable and the parameters used in the model are suitable. By using wind profiles of ten years, 7, 021 simulations under different wind profiles were carried out, and then probabilistic hazard maps of tephra fallout were constructed for tephra thickness thresholds, lcm and 0.5cm. This study can provide an important scientific basis for volcanic hazard analysis, risk mitigation plans and countermeasures in the Longgang volcanic area.展开更多
文摘根据系统的特征进行故障诊断往往因为故障的信息不足而难以确诊。将人工智能的思想引入故障诊断的理论之中以克服信息的不足和有效地利用专家知识,是一种解决故障诊断难题的有效方法。结合灰色定性仿真理论和R e iter R的基于第一原理的故障诊断理论的定性定量故障诊断理论被提出,它根据系统的现实状态与用灰色定性仿真预测的系统的状态的差异判断系统是否发生了故障,若故障出现,通过故障状态与故障模型的匹配确定故障的类型。这种方法能有效地结合的定性信息和定量信息,根据系统有限的定量信息建立其变量间的定性约束并将其应用于故障诊断。
基金unded by the National Natural Science Foundation Project(40972209)the Special Projects for China Earthquake Research(201208005)
文摘Tephra fallout is an important type of hazard caused by explosive volcanic eruption, and numerical simulation has become a fast and effective approach to assess the dispersion and deposition of tephra fallout. According to the improved 2D diffusion model of Suzuki （ 1983）, we edited a tephra diffusion program that can run in the Windows system. Based on previous data, we simulated the diffusion scope of the Jinlongdingzi volcanic eruption, which is the latest eruption in the Longgang volcanic cluster. The simulated results are in good agreement with the results from measurement in situ, indicating that the model is reliable and the parameters used in the model are suitable. By using wind profiles of ten years, 7, 021 simulations under different wind profiles were carried out, and then probabilistic hazard maps of tephra fallout were constructed for tephra thickness thresholds, lcm and 0.5cm. This study can provide an important scientific basis for volcanic hazard analysis, risk mitigation plans and countermeasures in the Longgang volcanic area.
