一种便携式侧扫声呐舷侧支架的设计及实现     

王墉成  李森  刘晓金  渠继州  付博伟 《海洋信息》2020,35(3):46-52

针对测量船进行侧扫声呐收放过程中人身和拖鱼存在安全隐患的问题,设计研制了一种便携式侧扫声呐舷侧支架。通过SOLIDWORKS对便携式侧扫声呐舷侧支架结构进行了设计,对零部件以及整体结构进行了力学分析和验算,基于ABAQUS有限元软件对不同工况下的侧扫声呐舷侧支架结构进行了有限元分析与仿真。最后,对便携式侧扫声呐舷侧支架进行加工制造以及安装测试,并对结构强度进行了验证。结果表明,该设备安全可靠,省时省力,可有效提高作业现场的工作效率。  相似文献   

海南岛西海岸沙丘形成动力过程的风洞模拟试验   总被引：3，自引：0，他引：3  

李森  刘贤万  李会川  郑影华  魏兴琥 《地理学报(英文版)》2007,17(4):453-468

The western coast of Hainan Island exhibits a savanna landscape. Many types of sand dunes, including transverse dune ridges, longitudinal dune ridges, elliptical dunes, coppice dunes, and climbing dunes, are widely distributed in the coastal zone. In winter, high-frequency and high-energy NE winds (dominant winds) are prevalent, with a resultant drift direction (RDD) of S35.6°W. In spring, low-frequency and low-energy SW secondary winds prevail, with a RDD of N25.1°E. Wind tunnel simulations revealed that the airflow over the dune surface is the main factor controlling the erosion and deposition patterns of dune surfaces and the morphological development of dunes. In the region’s bidirectional wind en- vironment, with two seasonally distinct energy levels, the airflow over the surface of elliptical dunes, barchan dunes, and transverse dune ridges will exhibit a transverse pattern, whereas the airflow over longitudinal dunes ridges exhibits a lateral pattern and that over climbing dunes exhibits a climbing-circumfluent pattern. These patterns represent different dynamic processes. The coastal dunes on the western coast of Hainan Island are influenced by factors such as onshore winds, sand sources, coastal slopes, rivers, and forest shelter belts. The source of the sand that supplements these dunes particularly influences the development pattern: when there is more sand, the pattern shows positive equilibrium deposition between dune ridges and dunes; otherwise, it shows negative equilibrium deposition. The presence or absence of forest shelter belts also influences deposition and dune development patterns and transformation of dune forms. Coastal dunes and inland desert dunes experience similar dynamic processes, but the former have more diversified shapes and more complex formation mechanisms.  相似文献