Optimization Design Method For Small AUV Streamline

With the growing strategic status of marine, the research level of smallautonomous underwater vehicle directly determines countries’ submarine strategicposition. To achieve purpose of unlimited, remote, flexible, good concealment andlow cost, the linear design optimization to reduce noise and vibration as well as toreduce resistance of underwater robots has always become a national investigation.First, the linear design theory and main geometric parameters as well as indicatorpurpose and key design of underwater vehicle is given. On the basis, several kinds oflinear theory, characters and programming methods are given and advantages anddisadvantages of each kind were pointed out. This build a theoretical foundation foroptimization design of complex linear and algorithm. Parametric and non-parametricmodels are established according to the overall design of underwater vehicle.A mathematical model is established to achieve realistic motion simulation andto get accurate transient performance of underwater robots. The low-frequencyoscillation unsteady movement is compiled by Fluent UDF and the simulation of realmovement of two-dimensional underwater robot was realized by using of unstructureddynamic mesh. The superiority of linear bionic “Dolphin” is validated by comparinghydrodynamic characteristic of three different linear models. Show the scientific anddefect of using steady replace unsteady and provide preparation for mechanisminvestigates and unsteady manipulation.Effects of propeller for underwater robot motion resistance is researched bythree-dimensional analysis by using CFX technology. The relationship between fluidvelocity U and propeller speed n is achieved by theoretical derivation of thepropulsion system. The resistance as well as the relationship of drag coefficient undertwo conditions is obtained by hydrodynamic simulation analysis which offers furtherimportance of simplifying models and optimizing layout for AUV propulsionresearch.Numerical calculations of hydrodynamic characteristics is quickly and accurately achieved by programming based on flow-boundary layer theory. And relationshipbetween resistance and shape parameters is further obtained to optimize the design ofits shape. And the fitting curves is verified by hydrodynamic simulation which offersimportant theoretical and practical value for optimal design of underwater robotic.Finally, effects of different linear of underwater vehicle for structural vibrationperformance and hydrodynamic performance is researched. Interdisciplinarycollaborative multi-objective optimization design for underwater vehicle was realizedbased on power flow noise and vibration resistance. Optimal solution was obtained bycomparing three optimization results.