Performance Evaluation and Verification on Load Relief for LM-8 Launch Vehicle

• 作者: ZHAO Yongzhi CHEN Xiaofei LIU Yin LI Jinglin
• 来源期刊: 中国航天（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: NEW GENERATION MEDIUM-LIFT LAUNCH VEHICLE—LM-8
• 页码范围: 42-47
• 页数: 6页
• 语种: 英文
• DOI: 10.3969/j.issn.1671-0940.2021.02.005

摘要

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 vehi-cle 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.Sim-ulation 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,simula-tion results indicate that the more severe the wind shear is,the better performance of load relief can be achieved.