Optimum trade-off charts considering mass variation for the design of semi-active and passive shock absorbers for landing gear

Abstract

In this study, we proposed two types of optimum trade-off charts considering mass variation for the design of a semi-active shock absorber and a passive shock absorber for landing gear. Each of these trade-off charts is formed from two curves indicating different types of data. Along one curve, the aircraft mass is constant, and shock absorbers having various dimensions are considered. Along the other curve, the aircraft mass varies from maximum to minimum values, and a specified shock absorber is considered. In order to generate optimum trade-off charts considering mass variation by means of a multi-objective optimization, we introduce a parameter related to the initial volume of gas inside the shock absorbers. We are able to establish and solve a multi-objective optimization problem and generate optimum trade-off charts considering mass variation. Using the optimum trade-off charts, we evaluate and compare the performance of semi-active and passive shock absorbers considering mass variation. It clearly demonstrates that the optimum trade-off charts are helpful in the design of landing gears for various aircrafts.

Keywords

• landing gear
• multi-objective optimization
• shock absorber
• mass variation
• trade-off chart