摘要
运载火箭助推器分离后的落点预示对于安全区的管控及回收系统的设计十分重要,然而助推器再入过程由于失去姿态控制能力导致姿态运动范围大、运动规律复杂,传统型号往往采用极限偏差组合或六自由度打靶的手段来进行助推器落点范围的预示,存在预示范围过大、预示方法对落点预示范围正向设计指导意义不足的问题。采用一种基于非线性动平衡理论的分析方法,分析助推器无控再入过程三通道耦合姿态运动动态稳定特性,辨识固有周期性姿态运动模态,针对有限固有模态建立等效质点运动受力建模,快速、精确分析助推器分离后的落点范围,并能够对助推器特征参数对落区范围影响进行灵敏度分析,指导落区范围正向设计。仿真结果表明:该方法相较极限偏差组合法大幅提升助推器落点预示精度,相较六自由度打靶法更高效、更具有设计指导意义,为火箭助推类飞行器的航区安全性设计提供了重要支撑。
The impact booster after separation of the carrier is important for the design of the control and recovery system in the Safety Zone,however,in the course of booster reentry,the loss of attitude control capability leads to the large range of attitude motion and the complex motion law.Traditional models often use the combination of limit deviation or 6DOF shooting to predict the impact area of booster,there are some problems,such as too large prediction range and insufficient significance of prediction method for forward design of landing point prediction range.A method based on nonlinear dynamic balance theory is used to analyze the dynamic stability characteristics of three-channel coupled attitude motion in the process of uncontrolled reentry,and to identify the inherent periodic attitude motion modes,based on the finite natural mode,the equivalent particle motion model is established to analyze the impact area of the separated booster rapidly and accurately,and the sensitivity analysis of the impact of the booster characteristic parameters on the impact area can be carried out,to guide the positive design of the area.The simulation results show that this method can greatly improve the prediction accuracy of the booster’s Landing Point,and is more efficient and instructive than the 6DOF shooting method,it provides an important support for the safety design of the flight area of the rocket-propelled vehicle.
作者
张意国
赵长见
高峰
李玉龙
ZHANG Yiguo;ZHAO Changjian;GAO Feng;LI Yulong(China Academy of Launch Vehicle Technology,Beijing 100076,China;Unit 96901 of PLA,Beijing 100094,China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2024年第8期81-86,共6页
Journal of Ordnance Equipment Engineering
关键词
非线性动平衡
模态辨识
助推器
无控
落点预示
nonlinear dynamics balance
mode identification
booster
prediction of impact point
