Selection And Analysis Of Flexible Skirt Schemes For 30 Passenger Seat Hovercraft

China’s national strength is growing and taking great steps to promote the strategy of maritime power,amphibious landing and littoral combat is the focus of development,hovercraft as an excellent amphibious landing transport tool needs more and more attention.The air cushion will lift the hull of hovercraft to a certain height,so that the hull is all free from the support surface.So it has excellent amphibiousness and rapidity,and is often used in military tasks such as landing and beaching,transport operations or civil tasks such as surface rescue and salvage.In order to respond to the national call,the project "Industrialization and Demonstration Application of Amphibious Emergency Protection Hovercraft" cooperated by Harbin Engineering University and Hubei Zhongnan Pengli Co,Ltd.plans to build30-passenger medium-sized fully cushioned hovercraft for emergency rescue and maritime law enforcement tasks in the Erguna River during the ice flow period,ice sealing period and wetland mudflats,and to meet the requirements of the jurisdiction of The operation of hovercraft in the field supervision tasks.The most crucial thing from the experimental stage to the engineering application of the hovercraft is the breakthrough innovation and improvement in the hovercraft apron.In order to better to meet the project objectives,this paper takes the actual 30-passenger hovercraft as the research object and explores the influence of the design parameters of the apron on the performance of the hovercraft using CFD and numerical analysis methods to provide reference for the design of the apron,and mainly does the following research and work:(1)Studied the basic principle of apron structure design of hovercraft and the analysis method of apron designs parameters,carefully analyzed and studied the apron characteristics,and determined the design parameter categories of apron by using the hovercraft that we participated in building during the internship as the research object.(2)The influencing factors of static apron lift characteristics of hovercraft on rigid ground are studied.Based on the CFD method,the static cushion lift state of the full cushion lift hovercraft on rigid ground is simulated,its cushion lift characteristics are analyzed,and the influence of different apron design parameters on the static cushion lift characteristics of the full cushion lift hovercraft is investigated.(3)The coupling effect of the hull system,apron system and cushion lift system of hovercraft is studied,focusing on the relationships between the cushion pressure,airbag pressure,drainage height and apron deformation,and finally the kinematic response model of the full cushion lifts hovercraft is derived,and its dynamic time domain is solved numerically using the fourth-order Longacurta method to investigate the effect of different apron designs parameters on the response characteristics of the apron airbag.(4)The study investigates the force and deformation of the capsule finger touching the water when hovercraft slips sideways.Based on the fluid-structure coupling theory and with the help of Fluent and transient modules in ANSYS,the fluid-structure coupling simulation environment of the hovercraft is created to investigate the effect of different apron parameters on the response characteristics of the apron bursa.Through the above research,a reasonable research method is selected to provide reference to the research related to the influence of apron system design parameters on the performance of hovercraft,and the better selection interval of characteristic parameters such as binary flexible apron airs cushion width,capsule finger height and capsule finger inclination angle is also obtained through comparative analysis to finally ensure that the constructed hovercraft can achieve all the performance to accomplish the task.