English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Aircraft landing gear retraction and extension are commonly actuated by hydraulic cylinders. Traditionally these hydraulic systems do not include servomechanisms. In this research, a speed controller and a servo valve are attached to the actuator to control the motion. Speed input is composed to generate steady retracting motion. Feedback control with an integrator is adopted. A simulation model containing landing gear mechanism, hydraulic system and the controller is built to investigate the performance of control law. By choosing appropriate gain, landing gear retraction duration and the impacts during retraction are reduced.

Design and Simulation of Aircraft Landing Gear Retraction Hydraulic Servo System