【摘要】 固体轨控发动机喉栓控制精度是影响推力输出品质的重要因素之一。喉栓在伺服机构驱动下通过轴向位移改变喷管喉部面积，实现推力调控。由于伺服机构存在摩擦、间隙等非线性不确定性因素，喉栓实际位置与指令存在偏差，使得输出推力产生波动，进而影响飞行器轨道控制的准确性和稳定性。针对这一问题，首先构建考虑伺服机构摩擦与间隙等不确定性因素的固体轨控发动机推力计算模型，提出发动机推力性能不确定性分析方法，获取动态调节过程的单阀推力包络；其次，考虑发动机差动工作模式设定喉栓运动时序，实现多阀协同动态调节过程推力不确定性的量化；最后，对单阀推力性能进行敏感性分析，辨识影响推力不确定性的主要参数。研究结果表明，单阀推力散布范围与喉栓运动频率正相关；多阀差动分配策略可显著降低推力偏差，最大推力标准差较单阀调节降低71.5%。更多还原

【Abstract】 The control accuracy of the pintle of solid divert control motors(SDCMs) is a critical factor influencing the quality of thrust. The pintle, driven by the servomechanism, regulates thrust by adjusting the throat area via axial displacement. Due to the presence of nonlinear uncertainties such as friction and clearance in the servomechanism, the actual position of the pintle deviates from the commanded trajectory. This deviation induces fluctuations in the thrust, thereby compromising the accuracy and stability of spacecraft trajectory control. To address this issue, a thrust model for SDCMs considering uncertainties such as friction and clearance of the servomechanism is first constructed. A methodology for thrust performance uncertainty analysis is proposed. Combined with established thrust model, it enables the determination of the single-valve thrust envelope under dynamic regulation. Subsequently, the motion sequence of the pintle is set based on the motor’s differential operating mode, thereby enabling the quantification of thrust uncertainty during the coordinated dynamic adjustment of multiple valves. Finally, the key parameters influencing thrust uncertainty are identified via a sensitivity analysis of single-valve thrust. The research results demonstrate that the dispersion range of single-valve thrust exhibits a positive correlation with the actuation frequency of the pintle. Additionally, the thrust deviation is significantly reduced through the implementation of a multi-valve differential distribution strategy, characterized by a 71. 5% reduction in the standard deviation of the maximum thrust compared to single-valve regulation.更多还原