钢箱拱桥施工监控数据处理与分析系统的开发

为简化钢箱拱桥施工监控的数据处理和分析工作,采用Access 2003作为数据库引擎、VB.net 2010作为界面开发工具,开发了“钢箱拱桥施工监控数据处理与分析系统”.该系统实现了对桥梁线形、应力、索力及塔偏的监测与控制数据的处理和分析,具有理论计算模型数据处理、实测数据处理、误差分析和施工监控指令生成等功能.该系统在南广铁路西江特大桥施工监控工作中应用良好,验证了该系统的可靠性.     

某水下发射装置自由弯曲振动的流固耦合分析(英文)

A pneumatic launcher is theoretically investigated to study its natural transverse vibration in water. Considering the mass effect of the sealing cover, the launcher is simplified as a uniform cantilever beam with a top point mass. By introducing the boundary and continuity conditions into the motion equation, the natural frequency equation and the mode shape function are derived. An iterative calculation method for added mass is also presented using the velocity potential function to account for the mass effect of the fluid on the launcher. The first 2 order natural frequencies and mode shapes are discussed in external flow fields and both external and internal flow fields. The results show good agreement with both natural frequencies and mode shapes between the theoretical analysis and the FEM studies. Also, the added mass is found to decrease with the increase of the mode shape orders of the launcher.And because of the larger added mass in both the external and internal flow fields than that in only the external flow field, the corresponding natural frequencies of the former are relatively smaller.