Research On Aerodynamic Interference Of Missile Model Supported By Wire-driven Parallel Robot And Wire Tension Variation Characteristics

Compared with traditional rigid support,Wire-driven Parallel Robot has the characteristics of less flow field interference and good dynamic performance,which provides a new type of support method for wind tunnel tests.This article will take a typical projectile model as an example to study the aerodynamic interference characteristics and stability of the rope support system under high-speed flow.In addition,for rope support,in addition to adjusting the position and posture of the aircraft model by controlling the rope length,it is also necessary to control the rope tension at the same time to avoid false traction or reduce the support stiffness;during the wind tunnel test,the rope tension changes to a certain extent To a certain extent,it reflects the role of the model aerodynamic force,which makes it possible to calculate the aerodynamic force by monitoring the change of the rope pulling force.Therefore,it is very important to study the changing characteristics of rope tension during the dynamic test.This article will focus on the following researches in response to the above two key issues:First of all,numerical simulations were carried out on the basic Finner standard models of cordless support and rope support in FLUENT software to analyze the interference effects of ropes on the aerodynamic characteristic coefficients at different angles of attack and different Mach numbers;and consider the different diameters and diameters of the ropes.The influence of factors such as the position of the traction point and different traction methods,and finally the stability of the system is analyzed based on the dynamic equation to determine the best traction method of rope traction,optimize the rope layout,and provide support for the rope traction layout.Secondly,the fluid-structure coupling transient simulation analysis is carried out on the moving rope in the wind tunnel dynamic test.With the help of the CFX module in ANSYS,the rope tension analysis of the moving rope under the action of the flow field is carried out,and the comprehensive effect of the flow field and movement on the change of the rope tension is summarized.Then simulate and analyze the influence of different incoming flow speeds on the tension of stationary ropes and moving ropes.Focus on the transient coupling simulation of different motion state parameters(rotation direction,motion speed,frequency and amplitude)of the moving rope,and summarize and summarize the relationship between dynamic rope tension and different motion state parameters.Finally,the physical quantities that may affect the rope tension are dimensionally analyzed based on the π theory,and the dynamic rope tension function relationship is derived;and the dynamic rope tension under the combined action of the flow field and motion is modeled by the RBF network with output feedback.The results show that the fitting effect is not ideal;a neural network-Adaboost fusion model is further proposed to predict the dynamic rope tension of the mo ving rope.It can be seen that it is more ideal than the RBF rope tension model with output feedback,and can be very good.Fitting dynamic rope tension data can accurately model rope tension.In this paper,the aerodynamic interference and stability of the projectile and rocket support and the dynamic rope tension of the traction rope are numerically simulated,which can provide support for the high-speed wind tunnel dynamic test.