Wear reliability analysis of tapered valve based on second moment of checking point

In order to clarify the influence of the wear characteristics on the reliability of the conical valve in the fuel system of an aero-engine, a second-order moment reliability analysis method based on the checking point was proposed, which focuses on the influence of the key parameters on the wear reliability of the conical valve on the basis of establishing the wear depth model of the conical valve. Combining the Archard wear model with the spool force analysis, the mapping relationship between the cumulative wear depth of the valve and the geometry, material parameters, and working condition parameters was established, and the wear function was clarified and the basic random variables were determined through the generalized stress-interference theory. Through the proposed second-order moment reliability analysis method at the check point, the wear reliability and sensitivity of a conical valve were simulated and analyzed. The simulation results show that the wear reliability is positively correlated with the material hardness of the conical valve at a certain cone angle, and increasing the diameter of the valve has a more obvious effect on the wear reliability. The wear reliability is slightly improved by increasing the number of cone angles. Moreover, the variables that have positive and negative effects on the wear reliability of the conical valve are identified through the global sensitivity analysis, and the sensitivity ranking of importance and dispersion is clarified.