火箭推力原位标定系统的防爆结构优化与不确定度评定

发布时间：2018-03-29 12:51

本文选题：原位检测　切入点：防爆　出处：《吉林大学》2015年硕士论文

【摘要】：火箭发动机推力地面试验中，对测量系统进行模拟实际工况的静态标定和校核是一项不可或缺的重要工作,它直接影响着测量数据的准确性与测量工作过程的可靠性。为了确保推力测量的直接和精确，依据国家计量法规，必须对其进行溯源，需要更高的标准来对其进行检定和计量。本文针对此情况，设计了火箭推力原位标定系统，并进行了关键结构的防爆优化和不确定度评定研究。 1、本文分别阐述了原位检测技术、防爆安全研究、测量不确定度技术在国内外同类设备上的发展现状。通过分析原位标定系统的结构及工作原理，利用ANSYS软件对系统关键部件（上横梁和丝杠副）及整机进行了静力学、模态模拟仿真，说明系统满足刚度、强度及外部振动影响，设计合理，验证了理论分析的正确性。 2、本文的测试系统为原位测试系统，故需在设备现场进行标定和校准，有火箭发动机工作介质燃爆的可能。针对此情况，本文利用AUTODYN软件，分析模拟了液体推进剂爆炸所产生的冲击波超压情况，，同时分析了原位标定系统在距爆炸点不同距离的受力变形情况，得出毁伤评价，并以此为基础对原位测试系统的结构进行优化。 3、按照国家计量标准考核规范、JJG144-2007《标准测力仪检定规程》以及JJF1059-1999《测量不确定度评定与表示》，分析了影响原位标定系统静态不确定度的主要因素及误差来源，阐述了测量系统的不确定度评定与分析方法，为评价系统计量能力提供了技术支持以及参考依据；探讨了火箭推力原位标定系统的A类、B类不确定度的评定方法以及合成标准不确定度的计算方法，并通过相关实验，给出了合理表征测量结果质量的详细指标。
[Abstract]:Thrust of the rocket engine ground test, the measuring system and check the static calibration for simulating the actual working conditions is an indispensable important work, which directly affects the reliability and accuracy of measurement process measurement data. In order to ensure the thrust measurement directly and accurately, according to the national metrological regulations, must be traced to the source, need more high standards for the verification and measurement on it. In this paper, the design of rocket thrust calibration system, and studied the assessment of explosion-proof structure and optimization of key uncertainties.
1, this paper expounds the in situ detection technology, safety research, the measurement uncertainty of the current situation of the development of technology in similar equipment at home and abroad. Through the analysis of in situ calibration structure and working principle of the system, the key components of the system using ANSYS software (a screw) and machine of statics, modal simulation. The system meets the stiffness, impact strength and external vibration, reasonable design, verify the correctness of the theoretical analysis.
2, this test system for in situ testing system, so the need for calibration and calibration equipment in the field, the rocket engine working medium blasting. In this case, this paper uses the AUTODYN software, simulation analysis of liquid propellant explosion shock wave overpressure, and analyzed the in situ calibration system from the explosion at different distances of the deformation, the damage assessment, optimize the structure of in situ testing and as the foundation of the system.
3, according to the national examination of measurement standard specification, calibration Rules > and JJF1059-1999< evaluation and expression of uncertainty in measurement > force JJG144-2007< standard, analyzes the effect of in situ static calibration system of uncertainty factors and error sources, describes the measurement system uncertainty analysis and evaluation methods, and provide technical support the reference basis for the measurement capability evaluation system; discusses the thrust of the rocket in situ calibration system for a B class, the evaluation method of uncertainty and combined standard uncertainty degree calculation method, and through experiment, gives a detailed characterization of a reasonable indicator of the quality of the measurement results.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V433.9

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