Long-Distance Navigation Tunnel Ship Traction System Program Research

As the backbone of the main waterway in Guizhou Province,the Wujiang River is also one of the main carriers for Guizhou Province to integrate into the Yangtze River Economic Belt.in order to improve the carrying efficiency of ships,it is planned to build the Wujiang Navigation Tunnel.The tunnel channel is in closed waters,the channel bank is upright,and the cross-sectional scale is limited,which belongs to a special restricted channel.In addition,due to the large size of the standard ship of the Wujiang waterway transport ship,the dark light in the long-distance tunnel,and the small distance between the ship and the shore,it is difficult for ships to pass safely in such a channel.Therefore,it is proposed to adopt the navigation technology of tunnel ship traction system,and its performance is directly related to whether the ship can navigate safely in the tunnel environment.The traction system,as a mechanical traction navigation scheme,it generates nonlinear dynamic response under operating conditions such as navigable width,water depth,traction angle,traction acceleration,etc.increased uncertainty in the navigation process.The thesis mainly focuses on the research on the relationship between the traction system in the tunnel operation stability and the operating conditions.in order to design a ship traction system scheme that can be applied to the Wujiang tunnel.This thesis mainly focuses on the following aspects:First,to explore whether the ship’s traction system can ensure the safe navigation of ships in the tunnel,and to obtain the variation law between the system’s operating stability and operating conditions.Taking the Silin hub as an example,for the scaleddown model,according to the basic structure of the traction system and the force of the towed ship model,the motion state of the ship model in the channel is simulated,and the kinematic mathematical model is established.Substitute the ship model and channel data to solve the mathematical model,based on the maximum offset and maximum tensile force generated by the ship under different operating conditions,the feasibility of safe navigation of the traction system in the tunnel is verified,and the variation law between the operation stability of the traction system and the operating conditions is obtained.Secondly,in order to verify the numerical simulation conclusion of the traction system,the motion state of the ship under different navigation conditions of the traction system is explored.suggestions on the best operating conditions of the system are made.On the basis of numerical simulation calculation,the channel conditions of Silin Junction are simulated,Build a traction system test bench and carry out physical model tests.Based on the experimental data,verify the accuracy of the simulation conclusions,obtain the optimal channel size and operating conditions under the test conditions.According to the similarity relationship equation between the ship and the ship model,the optimal working conditions such as channel construction size,traction acceleration,and traction angle in the actual tunnel channel are obtained by calculation,which provides a theoretical basis for the design of the actual ship traction system.Finally,according to the simulation and experimental conclusions,combined with the actual tunnel environmental conditions,design the system control scheme and the structure of each component,and calculate the required component parameters.Using finite element analysis technology,stress and strain analysis are carried out on the key stress points of the designed structure to verify the rationality of the structural design.The research results of the thesis can provide reference for the construction of navigation channels and navigation traction systems,and have certain guiding significance for reducing environmental pollution,reducing engineering costs,and increasing navigation safety.