Sensitivity analysis of ejection performance parameters of rodless high-pressure pneumatic catapult
By analyzing the influence law and sensitivity of parameters,an optimization calculation reference for the key parameters of the ejection performance of a rodless high-pressure pneumatic catapult is obtained.Based on the thermodynamic parameters and dynamic theory of real gases,an accurate interior ballistic model is established and compared with ejection test data and fluid simulation curves to obtain a relatively accurate theoretical calculation model.By using the global sensitivity method,the influence laws of seven main parameters of the interior ballistic stability and the departure velocity,as well as the linear main effect and second-order effect results of the parameters are obtained.The most sensitive parameter affecting the interior ballistic stability is the volume of the high-pressure chamber,and the most sensitive parameter affecting the departure velocity is the ambient temperature.The sensitivity of the second order main effect of the leakage rate multiple and the valve opening time themselves and the second order interaction effect with the other five influencing factors are relatively low,so the values of these two factors can be determined in advance in the design to reduce the design variables.The research results of this article can provide theoretical reference for the optimization of interior ballistics and ejection devices.
high-pressure pneumaticejection performancedesign of experimentsensitivity analysissecond order effect analysis
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