Sensitivity analysis of engine safety affecting factors based on the turbocharging


	system model

Abstract

Abstract:

Adopting turbocharging system can effectively restore the high-altitude power performance of the engine and improve the working ceiling of general aircraft. However, while improving the engine performance, its safety should

also be given sufficient attention. In order to improve the safety of the turbocharging system of aviation reciprocating engine and provide suggestions for actual operation, this paper combines model-based system safety analysis,

"V" shaped safety analysis, response surface methodology (RSM), and Sobol factor sensitivity analysis method, and

taking Rotax914 as prototype, a quasi dimensional model for the entire engine and fitting equation are constructed

for global sensitivity analysis. The sensitivity of the turbocharging system performance of aviation reciprocating engine to different safety affecting factors are analyzed and compared. The results indicate that the sensitivity index of

altitude is much higher than other factors, and the sensitivity index of intake valve diameter is higher than that of

exhaust valve diameter but they are similar in magnitude. The effective length of air filter has almost no effect on the

engine turbocharging system under normal operating condition. Therefore, during the actual operation, the change

range of safety affecting factors can be adjusted according to the analysis results, in order to reducing the uncertainty of key factors and conducting efficient and intuitive safety analysis.

Key words:

aviation reciprocating engine, turbocharging system model, response surface methodology (RSM), Sobol factor,

sensitivity analysis

CLC Number:

V234+ .1

LI Guoa, , WANG Zilub , TENG Yidab , XU Tonggeb.

Sensitivity analysis of engine safety affecting factors based on the turbocharging

system model

[J]. Journal of Civil Aviation University of China, 2025, 43(1): 1-10.

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Sensitivity analysis of engine safety affecting factors based on the turbocharging

system model

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