基于AHP的液体火箭发动机地面试验监测参数的选取方法研究

确定监测参数是液体火箭发动机地面试验监控系统的一个重要而基础的问题.从某液体火箭发动机地面试验稳态参数的统计特性和常见故障出发,通过分析地面试验测量参数的故障敏感性、故障关联性、测点传感器的可用性和参数相关性(或传感器冗余),建立具有方案层、准则层和目标层的层次模型,运用层次分析法(AHP)对发动机地面试验的测量参数进行评价、比较和优化,确定了用于监测液体火箭发动机地面试验的监测参数.经过发动机的地面故障试验数据和故障仿真数据的检验,所确定的监测参数集较好地反映了发动机状态的变化,说明所选用的方法合理、可行,解决了长期以来,依靠领域专家定性确定监测参数的问题.

Study of Monitoring Parameter Selection Based on AHP for LRE in Ground Test

It is an important and basic issue to choose monitoring parameters of Liquid propellant Rocket Engine(LRE) monitoring system in ground test.According to the statistic characteristics of steady parameters and the faults frequently happened in LRE ground test,after analyzing the sensitivity and correlation of monitoring parameters to faults,usability of the sensors and the correlation of measured parameters,the hierarchy models consisting of project layer,criterion layer and object layer for selecting monitoring parameters were established.Based on the Analytic Hierarchy Process(AHP),and with the help of the models,monitoring parameters to monitor the operation condition of LRE in ground test were evaluated,compared and optimized.Finally,the monitoring parameters were determined.The verification with the test data and simulation data of LRE ground test faults shows that the monitoring parameter set determined can supervise satisfactorily the change of LRE operation condition,and also shows that it is reasonable and practicable to use AHP selected monitoring parameters for LRE monitoring system in ground test.