基于复摆模型的多脉冲冲量耦合系数测量方法

Measuring method of multiple-pulse impulse coupling coefficient based on compound pendulum model

关键词:  激光推进  复摆  多脉冲  冲量耦合系数  测量模式

Key words:  Laser propulsion  Compound pendulum  Multiple pulses  Impulse coupling coefficient  Measurement pattern

摘要:

在单脉冲冲量测量方法的基础上,增加激光脉冲提取和摆杆控制单元,提出了一种基于复摆模型的多脉冲冲量耦合系数测量方法。分析了多脉冲的两种测量模式及实现流程,解决了数据处理面临的新问题,并对该方法进行了检验,结果表明:所设计的激光脉冲提取和摆杆控制单元满足25Hz频率要求,可实现在40ms内提取多脉冲序列的任意一个脉冲;模拟多脉冲序列下测得两种模式15°锥形喷管的冲量耦合系数为371.0～375.3N/MW,具有很好的一致性。该方法可用于吸气式激光推进的多脉冲性能研究,并作为其他多脉冲研究方法的有效补充。

Abstract:

A measuring method of multiple-pulse impulse coupling coefficient based on compound pendulum model was presented,in which a laser pulse extracting and a pendulum controlling unit was added to the single-pulse impulse measurement system.Two multiple-pulse measurement patterns and their implementation procedure were analyzed.Then new problems of data processing for the maximal angle were solved.Finally,the multiple-pulse measuring method was tested.Results indicate that the design of the laser pulse extractor and pendulum controller meets the 25Hz frequency requirement and any pulse in the multiple-pulse sequence can be extracted within the pulse interval of 40ms;As to a analog multiple-pulse sequence,the impulse coupling coefficients in both measurement patterns coincided well with each other,which ranged between 371.0 N/WM and 375.3 N/MW with a 15-degree conical nozzle.The measuring method can be applied in the study of multiple-pulse performance in air-breathing laser propulsion and it can work as a complement for other multiple-pulse research methods.