Ballistic missiles are perhaps the most critical and common flying devices today,flying at very high altitudes compared to aeroplanes.Among the important points about these flying devices is their very high speed in t...Ballistic missiles are perhaps the most critical and common flying devices today,flying at very high altitudes compared to aeroplanes.Among the important points about these flying devices is their very high speed in the final phase,usually several times the speed of sound.Choosing essential design parameters for making these devices has always been a significant challenge for designers.Structural,propulsion,aerodynamic,and control parameters are the most influential.The topic of nose cone aerodynamics is one of the essential design components to achieve the most reliable and optimal designs.Deciding the right nose cone has been one of the main challenges in recent years in this field.This article aims to review and analyse some examples of standard nose cones with this structure.For this purpose,first,the arrangement and layout of various designs and their specifications have been presented.The nose cone modelling has been performed for all modes,and each layout’s results have been introduced.Finally,a model based on the results is proposed,the most optimal and reliable arrangement based on aerodynamic parameters.展开更多
Rockets are a kind of missile that does not have a control system.But this does not mean that they fly entirely without control.Although these types of flying devices use a parabolic path for their movement,however,ce...Rockets are a kind of missile that does not have a control system.But this does not mean that they fly entirely without control.Although these types of flying devices use a parabolic path for their movement,however,certain types of them can fly a straight path even with arbitrary launch angles.In the matter of rocket control,due to its type of fuel,very short flight time,as well as weight restrictions,the use of controllers such as fixed aerodynamic fins/tabs on the body is more useful and practical.The main goal of this article is to analyze and choose a safe and improvement layout of the trim tabs and how to arrange them using calculations related to aerodynamic parameters and flight dynamics for direct flight control in rockets.For this purpose,trim tabs with triangular,trapezoidal,and square designs and with the ability to be installed as tail and/or canard trim tabs have been used and modeled.Finally,the performance of the models is compared to each other and the best or most reliable and improvement arrangement mode/model is presented along with the results.展开更多
文摘Ballistic missiles are perhaps the most critical and common flying devices today,flying at very high altitudes compared to aeroplanes.Among the important points about these flying devices is their very high speed in the final phase,usually several times the speed of sound.Choosing essential design parameters for making these devices has always been a significant challenge for designers.Structural,propulsion,aerodynamic,and control parameters are the most influential.The topic of nose cone aerodynamics is one of the essential design components to achieve the most reliable and optimal designs.Deciding the right nose cone has been one of the main challenges in recent years in this field.This article aims to review and analyse some examples of standard nose cones with this structure.For this purpose,first,the arrangement and layout of various designs and their specifications have been presented.The nose cone modelling has been performed for all modes,and each layout’s results have been introduced.Finally,a model based on the results is proposed,the most optimal and reliable arrangement based on aerodynamic parameters.
文摘Rockets are a kind of missile that does not have a control system.But this does not mean that they fly entirely without control.Although these types of flying devices use a parabolic path for their movement,however,certain types of them can fly a straight path even with arbitrary launch angles.In the matter of rocket control,due to its type of fuel,very short flight time,as well as weight restrictions,the use of controllers such as fixed aerodynamic fins/tabs on the body is more useful and practical.The main goal of this article is to analyze and choose a safe and improvement layout of the trim tabs and how to arrange them using calculations related to aerodynamic parameters and flight dynamics for direct flight control in rockets.For this purpose,trim tabs with triangular,trapezoidal,and square designs and with the ability to be installed as tail and/or canard trim tabs have been used and modeled.Finally,the performance of the models is compared to each other and the best or most reliable and improvement arrangement mode/model is presented along with the results.
