固体姿轨控发动机喉栓运动时序实验设计方法

Time-Sequence Experiment Design for Pintle Motion Scheme of Solid Divert and Attitude Control System

摘要:

固体姿轨控发动机通过伺服机构控制喉栓位移实现推力矢量调节。为实现推力精确调控，需拟合大量地面试验数据，得出发动机喉栓位移与推力矢量间的数学模型。提出了一种面向喉栓式固体轨控发动机喉栓运动时序实验设计方法，实现了单次试验中不同燃烧室理论压强及喉栓位移组合最大覆盖，为最低试验成本下精准构建喉栓位移与推力输出模型提供训练样本。以四阀固体轨控发动机作为对象，基于零维内弹道实现燃气发生器压强求解。采用Φp准则评估喉栓位置组合遍历性，并对其进行优化，获得合理的喉栓运动方案。算例结果证明实验设计后方案在整个运动周期内几乎遍历各种组合状态，较实验设计前Φp值提升近40%，验证了本文实验设计方法在时序工程问题中的优良性能。采用实验设计方法可提高固体姿轨控发动机地面试车数据利用效率。

Abstract:

The thrust vector is controlled by the servo mechanism of the Solid Divert and Attitude Control System （SDACS） adjusting the pintle displacements. To control the thrust precisely， a mathematical model of the thrust vector with respect to the pintle displacements must be constructed， which are always implemented by fitting a large amount of test data. A time-sequence experimental design method is proposed for the pintle motion of the pintle-controlled SDACS to reach the maximum coverage of the combination of gas generator theoretical pressure and pintle displacements in specific tests. The proposed method could provide excellent training samples for accurate prediction of the thrust with respect to the pintle motion with a low test cost. A four-valve solid orbit control motor is considered to solve the pressure of gas generator based on non-dimensional internal ballistics simulation. The Φp criterion is used to evaluate the ergodicity of the pintle displacements combination， and the Φp value is optimized to gain a reasonable pintle motion scheme. The results prove that the experimental design scheme almost covers combined states as many as possible in the entire period of motion and the Φp value is 40% higher than the value before experiment design， which verify the excellent performance of the method in this paper in the time-sequence engineering problems. The test data utilization efficiency could be improved effectively by the experimental design method.