On the motion of a spatial 6R retracting and twisting mechanism for landing gears

• Main Authors: Chien-Chou Hsin, 辛建周
• Other Authors: Hong-Sen Yan
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/11627014269902616192

碩士 === 國立成功大學 === 機械工程研究所 === 83 === Landing gear is one of the necessary systems of an airplane. The major object of this research is to investigate the application of Lee-Yan type II spatial 6R linkage for landing gears. First, existing landing gear mechanisms are surveyed and classified based on the characteristics of retraction, twisting ,and contraction. Then, Lee-Yan type II spatial 6R linkage is adopted as the retracting and twisting mechanism for the landing gear. Kinematic analysis of this mechanism is carried out according to matrix-loop approach and some constraints. The concept of "moving plane" is purposed and a systematic design procedure is presented for the kinematic design of the landing gear. The concept of moving plane, with only simple graph concept, can synthesize the landing gear easily without involving complicated algebraic and numerical calculations. Furthermore, engineers can change design parameters based on various spatial constraints and reguirements to obtain the same retracting and twisting motions and to avoid the problem of unique solution. Furthermore, since Lee-Yan type II mechanism is a compact mechanism in any position, the problem of interference can be checked by the concept of planar 4-bar linkages. Finally, an example is presented to illustrate the feasibility of the proposed approach.