| The internal electronic piezo gauge is the ideal equipment for the chamber pressure testing.The pressure parameter measured is very important to the strength check of the guns’ chamber, the velocity forecast of cannonballs’external ballistic trajectory and the performance verification of propellant.But its actual testing environment is very bad.It shows that the measured data spreads and its precision is also very low for the static calibrationed electronic piezo gauge used in real chamber testing. According to the testing environmen of piezo gauge, the calibration technology in simulation application environments using simulating bore pressure calibration system is put forward to ensure the accuracy of the piezo gauge in the testing environment of high temperature, high pressure and high impact.The system can simulate the testing environment of high temperature and high pressure.The electronic piezo gauge is quasistatic staticly calibrated based on the calibration method of pressure curve relativity in the simulation application environments to get the dynamic sensitivity. Dynamic sensitivity is more applicable than the sensitivity of static calibration which can reduce the dynamic error of measurement system. The uncertainty of the internal electronic piezo gauge is evaluated quantitativey in order to analyze the quality tested results on the basis of existing uncertainty theory.In this dissertation, four aspects are included primarily: Firstly, according to the bad testing environment of electronic piezo gauge, the calibration technique of application simulation environment is put forward,it respectively analyzes pressure curve produced by simulation bore pressure generator and the real gun curve, the static and dynamic characteristics of standard system.Besides, the pressure curve relativity is researched,so as to prove the rationality and necessity of calibration in simulation application environment.Secondly, It introduces the calibration method based on pressure curve relativity.The electronic piezo gauge is quasistatic staticly calibrated in the simulation application environment based on this calibration method, the data set of the curves’rising edge are used to linearly fit.Besides,it analyzes the form characteristics of simulation bore pressure signal to further validate the rationality of the pressure curve relativity calculation. Next, the static and dynamic sensitivity of electronic piezo gauge is calculated and the experimental errors and uncertainty analyzed.Finally,this paper compares and analyzes the bore pressure curve, discusses the morphological characteristics of bore pressure signal measured. |
