and then in the absence of test data to establish the dynamic model.The issue was,how to accurately obtain the mode data of LM-8 with numerical simulations which directly affects the control reliability of flight.In t...and then in the absence of test data to establish the dynamic model.The issue was,how to accurately obtain the mode data of LM-8 with numerical simulations which directly affects the control reliability of flight.In this paper,various approaches to obtain the dynamic characteristics of LM-8 are described from the perspective of refined dynamic modeling and simulating,mode slope prediction,vertical modal test,etc.The numerical simulations were found to be in good agreement with the experimental data,and satisfied the requirements for the engineering application,which effectively supported the successful maiden flight mission of LM-8.展开更多
The maiden flight of LM-8 performed perfectly on December 22,2020.The design concept of modularization,seriation and combination has been perfectly exhibited in LM-8.The four main technical innovations,including rapid...The maiden flight of LM-8 performed perfectly on December 22,2020.The design concept of modularization,seriation and combination has been perfectly exhibited in LM-8.The four main technical innovations,including rapid integrated design based on modularization,engine thrust regulation,modal parameters acquisition technology based on numerical simulation,and flight load control,were verified during the maiden flight.LM-8 is now positioned to be the main force in China’s medium launch vehicles for commercial launch.In the future,the mission adaptability of LM-8 will be improved to provide efficient and low-cost launch services.In addition,new technologies to allow repeated use and autonomous flight will be validated.展开更多
LM-8 inherited mature modules from other launch vehicles,adapting the overall design through the combination of engine throttling,wind compensation and load relief control,so as to reduce the aerodynamic load during f...LM-8 inherited mature modules from other launch vehicles,adapting the overall design through the combination of engine throttling,wind compensation and load relief control,so as to reduce the aerodynamic load during flight.This paper proposes a rapid evaluation method for load relief performance,which takes launch vehicle’s characteristics,wind field,control parameters,aerodynamic deviation and structure deviation into consideration,and provides a quick estimation method for load relief performance.The load relief performance of the LM-8 launch vehicle estimated by this method achieved 10%-20%in pitch and 20%-40%in yaw.The specific results are related to parameter deviation,the altitude of wind shear and the relationship between wind direction and trajectory angle.Simulation results for a typical case with six degrees of dynamic freedom of flight proves that the comprehensive load relief performance would be between 14%to 34%,which is in line with the aforementioned method.In addition,simulation results indicate that the more severe the wind shear is,the better performance of load relief can be achieved.展开更多
文摘and then in the absence of test data to establish the dynamic model.The issue was,how to accurately obtain the mode data of LM-8 with numerical simulations which directly affects the control reliability of flight.In this paper,various approaches to obtain the dynamic characteristics of LM-8 are described from the perspective of refined dynamic modeling and simulating,mode slope prediction,vertical modal test,etc.The numerical simulations were found to be in good agreement with the experimental data,and satisfied the requirements for the engineering application,which effectively supported the successful maiden flight mission of LM-8.
文摘The maiden flight of LM-8 performed perfectly on December 22,2020.The design concept of modularization,seriation and combination has been perfectly exhibited in LM-8.The four main technical innovations,including rapid integrated design based on modularization,engine thrust regulation,modal parameters acquisition technology based on numerical simulation,and flight load control,were verified during the maiden flight.LM-8 is now positioned to be the main force in China’s medium launch vehicles for commercial launch.In the future,the mission adaptability of LM-8 will be improved to provide efficient and low-cost launch services.In addition,new technologies to allow repeated use and autonomous flight will be validated.
文摘LM-8 inherited mature modules from other launch vehicles,adapting the overall design through the combination of engine throttling,wind compensation and load relief control,so as to reduce the aerodynamic load during flight.This paper proposes a rapid evaluation method for load relief performance,which takes launch vehicle’s characteristics,wind field,control parameters,aerodynamic deviation and structure deviation into consideration,and provides a quick estimation method for load relief performance.The load relief performance of the LM-8 launch vehicle estimated by this method achieved 10%-20%in pitch and 20%-40%in yaw.The specific results are related to parameter deviation,the altitude of wind shear and the relationship between wind direction and trajectory angle.Simulation results for a typical case with six degrees of dynamic freedom of flight proves that the comprehensive load relief performance would be between 14%to 34%,which is in line with the aforementioned method.In addition,simulation results indicate that the more severe the wind shear is,the better performance of load relief can be achieved.
