The Research On The Formation Of Amphibious Armored Vehicles At Sea Under The Excitation Of Wind,Wave And Current

Amphibious armored vehicle is one of the important weapons and equipment for amphibious operations.As the main combat equipment for beach and sea-crossing operations,group combat is an inevitable form of combat.When amphibious armored vehicles march at sea,they will be affected by complex environmental loads such as wind,waves and currents,and there will be interaction between multiple floating bodies in formation navigation,so navigation safety is a problem that cannot be ignored.Based on the theory of three-dimensional potential flow,this thesis studies the formation of amphibious armored vehicles at sea under the action of wind,waves and currents by panel method,and simulates the amphibious armored vehicles running in different formations and different navigation intervals under different waves.The specific work contents and achievements are as follows:First of all,a three-dimensional numerical wave tank is established by CFD method,and the motion of amphibious armored vehicles in waves is numerically simulated by dynamic grid technology,and the attitude response of the car body is obtained as a reference for viscous damping correction in subsequent hydrodynamic calculation.The wind field and flow field are established,and the wind and current load coefficients under specific wind speed and flow velocity are obtained,which ensures the accuracy of subsequent hydrodynamic calculation.Subsequently,a typical formation model of amphibious armored vehicles is established.Based on the three-dimensional potential flow theory,the hydrodynamic calculation of parallel formation system of amphibious armored vehicles with different sailing distances and different wave directions is carried out in frequency domain,and the hydrodynamic data such as the added mass,damping coefficient,first-order wave force(moment)and second-order drift force(moment)of the vehicle body under different wave frequencies are obtained,and the influence of hydrodynamic interaction in frequency domain on the formation system is explored.Finally,the time-domain characteristics of three typical formations with different navigation distances in the following,side and reverse waves in complex environment are analyzed,and the six-degree-of-freedom motion response and various forces of the car body are obtained.The formation systems with different navigation distances are comprehensively evaluated from two aspects of navigation stability and energy saving and consumption reduction,and the optimal spacing range of each formation under different waves is obtained.The calculation results can provide some reference for amphibious armored vehicles and other offshore floating structures,which is conducive to improving the stability of the formation,reducing navigation resistance and maximizing the advantages of the formation.