Abstract
A simple method of investigating the effect of joint clearances on landing gear retraction failure is presented and applied to the main landing gear with a single sidestay and a hydraulic actuator. A geometric model is presented with assumptions of each link as a rigid body and their relative positions geometrically determined by considering the size of the clearances. We conducted a sensitivity analysis based on a geometric model of the main landing gear. The model was calibrated using the data from the technical order. A Monte Carlo simulation (MCS) was conducted, and whose input was the distance of each clearance based on the experimental design that combined the modified Latin hypercube sampling (LHS) and central composite design (CCD). As a result, we were able to find that the joint had a high potential to operate abnormally. We validated the model by using the actual failure data. Finally, the physical meaning of the sensitivity analysis results was interpreted by comparing them with the values obtained through an amplification index method that is a modified linearization method.
Highlights
Structures that move in a predetermined and controlled manner are mechanisms [1].One important example is an aircraft’s landing gear, having a retraction function
Joints where a failure occurs during the opening and closing of the door, critical moment critical moment where a failure occurs during the opening and closing of theLock door, beforeAthe aircraft main landing gear retracts, is right after the Down before the aircraft main landing gear retracts, is right after the
Through the geometric analysis of the mechanism and the sensitivity analysis using an Monte Carlo simulation (MCS), we identified main joints that can cause malfunction of the main landing gear with a single sidestay and a hydraulic actuator
Summary
Structures that move in a predetermined and controlled manner are mechanisms [1]. One important example is an aircraft’s landing gear, having a retraction function. The landing gear needs to be stored in a small space and has a complex mechanism with nonlinear movement [2]. The links of the landing gear need to be arranged into a specific position for each cycle of the retraction and extension processes. The retraction and extension processes are conducted by hydraulic power, and single or multiple valves control the oil path. The arrangement of the links determines the position of the valve plunger. If the links are not arranged in their proper positions due to errors in the joints connecting the links, an abnormal operation can occur, and the landing gear can fail to retract
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