| Summary: | 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.
|
|---|
