基于马氏距离的液体火箭发动机稳态过程故障程度评估方法

当前健康管理技术在我国航天领域的发展还未完全成熟,国内针对运载火箭稳态飞行过程的故障检测与评估进行的工作还较少,而未来对于运载火箭牵制释放、动力重构等技术的应用,以及对可重复使用技术的需求,火箭稳态飞行过程的故障检测和评估将是其重要的技术支撑,具有十分重大的意义,因此提出一种基于马氏距离的液体火箭发动机稳态过程故障程度评估方法,并通过采用液体火箭发动机的仿真数据验证了算法的有效性,为运载火箭发动机健康评估技术的发展提供了一定的借鉴作用。     

Characteristic parameters from a human of electromagnetic signals heart system

The electromagnetic field of a human heart system is a bioelectromagnetic field. Electrocardiography （ECG） and magnetocardiography （MCG） are both carriers of electromagnetic information about the cardiac system, and they are nonstationary signals. In this study, ECG and MCG data from healthy subjects are acquired; the MCG data are captured using a high-Tc radio frequency superconducting quantum interference device （HTc rf SQUIDs） and the QRS complexes in these data are analysed by the evolutionary spectrum analysis method. The results show that the quality factor Q and the central frequency fz of the QRS complex evolutionary spectrum are the characteristic parameters （CHPs） of ECG and MCG in the time-frequency domain. The confidence intervals of the mean values of the CHPs are estimated by the Student t distribution method in mathematical statistics. We believe that there are threshold ranges of the mean values of Q and fz for healthy subjects. We have postulated the following criterion： if the mean values of CHPs are in the proper ranges, the cardiac system is in a normal condition and it possesses the capability of homeostasis. In contrast, if the mean values of the CHPs do not lie in the proper ranges, the homeostasis of the cardiac system is lacking and some cardiac disease may follow. The results and procedure of MCG CHPs in the study afford a technological route for the application of HTc rf SQUIDs in cardiology.     

Characteristic parameters of electromagnetic signals from a human heart system

The electromagnetic field of a human heart system is a bioelectromagnetic field. Electrocardiography (ECG) and magnetocardiography (MCG) are both carriers of electromagnetic information about the cardiac system,and they are nonstationary signals. In this study,ECG and MCG data from healthy subjects are acquired; the MCG data are captured using a high-T c radio frequency superconducting quantum interference device (HTc rf SQUIDs) and the QRS complexes in these data are analysed by the evolutionary spectrum analysis method. The results show that the quality factor Q and the central frequency f z of the QRS complex evolutionary spectrum are the characteristic parameters (CHPs) of ECG and MCG in the time-frequency domain. The confidence intervals of the mean values of the CHPs are estimated by the Student t distribution method in mathematical statistics. We believe that there are threshold ranges of the mean values of Q and f z for healthy subjects. We have postulated the following criterion: if the mean values of CHPs are in the proper ranges,the cardiac system is in a normal condition and it possesses the capability of homeostasis. In contrast,if the mean values of the CHPs do not lie in the proper ranges,the homeostasis of the cardiac system is lacking and some cardiac disease may follow. The results and procedure of MCG CHPs in the study afford a technological route for the application of HTc rf SQUIDs in cardiology.     

一种通用测试系统故障诊断功能设计

为了解决运载火箭测试过程中测试项目多、测试流程复杂、测试时间长的问题,一般采用具有故障诊断功能的通用测试系统,实现自动化测试。通过综合分析运载火箭测试项目需求,研究通用测试系统运行过程对故障诊断功能需求,提出了一种通用测试系统故障诊断功能设计方案,包括故障诊断的系统架构、线路诊断、测试平台自检、测试流程监测、故障定位,以及信息应用等功能。通过该故障诊断功能设计,简化了测试项目,实现了运载火箭的快速自动化测试、性能监测与状态评估,保障火箭的安全可靠运行,并可为维修决策提供支持。