Research on the coefficient of sound absorption in turbid water

China’s coastal waters are turbid and the properties of the seabed are complex. This negatively impacts the performance of underwater detection equipment. The properties of sound absorption in turbid water are not well understood. In this paper, the coefficient of sound absorption in turbid water was measured by the reverberation technique. All work was done in a reverberation barrel made of seamless aluminum. First, pure water was poured into the reverberation barrel and its reverberation time measured. Next, various concentrations of turbid water were poured into the barrel and their reverberation time measured. After all data had been gathered, the coefficient of sound absorption in turbid water of different concentrations was calculated. From this we determined a law of sound absorption in turbid water as summarized in the paper.     

道路桥梁工程中无损检测技术应用研究

应用无损技术对道路桥梁结构健康状况进行检测,可为养护与维修提供可靠参考,对提高道路桥梁运营安全性有重要意义。基于此,对道路桥梁工程中应用无损检测技术的必要性进行分析,并分析现阶段无损检测技术应用方面的不足,在此基础上提出相应优化策略,以期提高无损检测技术应用效果,保证检测结果的准确性与可靠性,促进我国在役道路桥梁运营安全水平。     

船上重件货物固定过程效率控制方法

采用传统效率控制方法存在控制效果差的问题,提出了系索拉力重件货物固定过程效率控制方法。设计重件货物固定形式,通过船舶行驶方向以及海浪大小调整货物固定状态,根据重件货物固定过程中示意图,计算船舶初始吃水量与货物装载后吃水量,以该结果为基础,分析船舶排除压载水的时间,即为重件货物固定过程时间,依据该时间可获取固定过程效率,改善控制效果差的问题。通过验证分析结果可知,该方法最高控制效果为90%,保障船上重件货物固定过程的高效性。     

基于构件病害的城市桥梁预防性养护模型研究

在充分研究马尔可夫过程理论的基础上,通过研究桥梁构件病害状态等级发展规律,确立了马尔可夫链构件退化模型,并以此为核心构建了一种城市桥梁预防性养护模型。最后利用北方某城市桥梁2006年至2018年检测数据,计算出构件病害状态等级转移概率矩阵,依据城市桥梁预防性养护模型,对1座同类型桥梁运营8年和14年后的预防性等级进行了预测。