Development And Hydrodynamic Performance Study Of Multi-Navigation Model Vehicle Prototype

In this paper,a new concept ocean vehicle with the characteristics of surface ship and submarine is developed according to the requirements of modern special tasks.According to the specific functional characteristics of the vehicle,the prototype is developed,and the hydrodynamic performance of the prototype is researched.The main work is as follows:First of all,based on a type of Multi-Navigation Model marine vehicle,a self-propeller prototype is developed.According to the model test conditions and the dimensions of the core components,the principal dimensions of the prototype are determined.According to the expected functions of the prototype,the subsystem construction scheme is completed.According to the general arrangement design scheme of the prototype,the processing and assembly are carried out.The floating condition check results of the prototype are given;and the indicators of the prototype are preliminarily demonstrated in combination with the design specifications of surface ships and submarines to form a more complete overall scheme of the prototype.Secondly,in this paper,the resistance performance of the prototype is analyzed.Based on the CFD method,the hull resistance of the prototype in the surface and underwater state is calculated,and compared with the model test results,the error analysis is carried out.The resistance performance differences between the prototype and the same displacement standard ship model(DTMB5415 and SUBOFF-B)are studied,and the comprehensive resistance performance of the prototype in different navigation conditions is analyzed.Based on the CFD method,the self-propelled resistance performance is studied,and the propeller performance curve of the prototype is obtained.Then,the underwater perpendicular maneuve simulation of the prototype is carried out.Through the analysis of the force on the prototype,the second-order manoeuvring motion equations of the prototype is established.Based on the capitive motion model test results of the prototype,the corresponding hydrodynamic coefficients are obtained.The path planning module,PID control module,motion equation module and motion coordinate conversion module are designed,and the underwater perpendicular maneuve simulation model of the prototype is established.The specified-depth direct navigation and step response navigation simulation of the prototype under single rudder control is preliminarily completed,and specified-depth direct navigation indicator of the prototype is checkedFinally,the seakeeping of the prototype is studied.This paper introduces the basic principles of three-dimensional potential flow theory and two-dimensional strip theory;selects two-dimensional strip theory to study the response amplitude operator of the prototype under different speed;on this basis,the motion response of the prototype under specific sea conditions and speed is studied by the spectral analysis theory;and some seakeeping indicators of the prototype is checked.