Random responses and reliability analysis of carrier-based aircraft landing gear based on direct probability integral method

Considering the random uncertainty of landing gear parameters in design and manufacturing, this study conducts a quantitative study on the random response of Carrier-based aircraft landing impact and the buffering performance of landing gear. Firstly, this study established a dynamic model of the landing vibration of a Carrier-based aircraft’s main landing gear. Then, based on the statistical characteristics of some filling parameters of the landing gear buffer (such as the initial volume of the air chamber, pressure oil area, oil shrinkage coefficient, etc.), the representative point set is divided by the direct probability integration method (DPIM), and the deterministic structural equation and probability density integration equation on the representative point set are solved. At the same time, the accuracy of DPIM application in the landing gear stochastic model is demonstrated by using the Monte Carlo Simulation (MCS) method. By outputting the buffer stroke of the landing gear, the vertical tire force, and the axial force of the strut, the mean value, standard deviation, probability density function, and related features of these responses are obtained. It is found that although the distribution of these responses are concentrated near the mean value, there is still a possibility of significant responses leading to system failure. Therefore, a functional function is defined using the buffer stroke, vertical tire force, and the axial force of the strut, and a reliability evaluation study is conducted on the landing gear structure under different threshold values.