| The navigation level of inland waterways varies,the current conditions are complex and changeable,and are influenced by climate and geographical location,and the problems faced by the upstream,midstream and downstream of Yangtze River are different.In inland waterways,the maneuverability of ships under the influence of deep and shallow waters,narrow river sections and different wind speeds has been studied by scholars,but the influence of wave force on ship navigation in inland waterways is relatively little studied and there is a lack of relevant examples to verify.In this thesis,the mathematical model of ship maneuvering motion considering wave force interference and the ship motion maneuvering performance disturbed by wave force are studied as follows:(1)Typical river sections were selected and corresponding hydrological,meteorological and geological data were collected.Based on the two-dimensional plane water flow mathematical model,the hydrodynamic analysis of the project river section was carried out,and the characteristic cross-sections were selected,the flow velocity,water level and other characteristic parameters were counted to confirm the validity of the water flow mathematical model and summarize the hydrodynamic characteristics of the project river section.(2)Based on the mathematical model of ship maneuvering motion under deep water conditions,the mathematical model of ship maneuvering motion under shallow water conditions was established.Through the real ship parameters,the ship is tested in straight,gyratory and Z-shaped tests to explore the maneuvering performance of representative ships and analyze the influence of shallow water effect on ship navigation.(3)Based on the mathematical model of ship maneuvering motion under deep and shallow water conditions,a mathematical model of ship maneuvering motion considering wave force interference is established.Various random wave spectra are compared and analyzed,and a reasonable random wave spectrum is selected to determine the test wave height by numerical simulation.The effects of waves on ship maneuvering performance under different wave heights,different wave directions,different draft ratios and different current speeds are explored.(4)Based on the numerical simulation of water flow in a typical river section,the ship motion mathematical model is applied to the engineering river section,comparing the two cases of considering only shallow water effect and considering both shallow water effect and wave force disturbance,statistical data of rudder angle,drift angle and speed,analyzing the effect of wave force on ship navigation,and giving suggestions on ship navigation safety. |
PDF Full Text Request