Optimization Of Explosion-proof Structure And Evaluation Of Uncertainty For The Rocket Thrust In-situ Calibration System

In the ground experiments of rocket engine thrust, the static calibration and checking withsimulating the actual working condition for the measurement system is a key link, which directlyaffects the accuracy of measured data and the reliability of the measurement process. In order toensure the accuracy and direct measurement of measuring thrust. According to the nationalmetrology regulations, it must be traceable and require higher standards to carry on thecalibration and measurement. Aiming at this situation, the author designed the rocket thrust in-situ calibration system, optimized key structure for explosion-proof and researched onuncertainty evaluation.1. This paper expounds the present home and abroad development situation of in-situdetection measurement, research on explosion-proof safety and the measurement technology ofuncertainty. Through the analysis of the structure and working principle of in-situ calibrationsystem and using the software ANSYS to simulate the statics and modality of the importantcomponent (beam and screw pair) and complete machine in the system, it indicates that systemmeets the demand of the stiffness, strength and external vibration effect, which means it is areasonable design and verifies the correctness of the theoretical analysis.2. In this paper, the test system is in-situ test, so we conducted the measurement andcalibration at the scene of the equipment. The working medium of rocket engine has thepossibility of exploding. Aiming at this situation, the author of this paper, using AUTODYNsoftware, simulates and analyzes the overpressure situation of shock waves resulted by the liquidpropellant explosion. At the same time we analyze the deformation of situ-calibration system at5meters away from the burst point. And get damage evaluation on base of which we conduct thestructure optimization of in-situ calibration system.3. According to the national metrology standard evaluation standard, JJG144-2007standard dynamometer test procedures and JJF1059-1999the evaluation and expression ofmeasuring uncertainty. we analyze the main factors and source of affecting the static uncertaintyin situ calibration system, expound the evaluation and analysis method of measuring theuncertainty of the system, provide a technical support and reference for evaluating the measuringability of the system. We also discuss the uncertainty evaluation method of class A and class Bfor the rocket thrust in-situ calibration system and the calculating method of combining standarduncertainty. And this paper gives a detailed index of reasonably characterizing measured resultand quality by the relevant experiments.