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Landing gear emergency release system is a common design of modern aircraft. In this paper, the typical landing gear emergency release system is analyzed, and the advantages and disadvantages of various emergency release forms are compared. This paper analyzed the research status of here and there electric emergency release technology, and made a p...
Context in source publication
Context 1
... this emergency release method, controlling the hydraulic valve block component in the bypass mode to release pressure, unlocking the upper locks of various components, and transmitting the locked and unlocked signals of upper and lower locks are all operated in the emergency release controller. The electric unlocking device is an independent driving device (shown in Fig.5), which is based on the original hydraulic actuating unlocking device. ...
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Citations
... In reference [10], the authors present a study concerning dynamic loads in landing phase. Emergency deploying systems for landing gears are in [11]. Some emergency unlocking systems for the landing gear are presented. ...
This work presents two versions of landing gear drives numerically simulated. We follow to obtain the right driving sequence of the legs and doors and the estimation of the landing gear deploy and retract time. Although the studies in this paper do not exhaust all the aspects concerning landing gear hydraulic system functioning, these are useful in the design phase of the aircraft hydraulic systems. Regarding the landing gear hydraulic system, we highlight one version of the drive stall phenomenon. When the hydraulic feeding pressure decreases, it is possible that the forces developed by the hydraulic cylinders are enough to retract completely the legs. The landing gear remains in an intermediate position, and the aircraft cannot accomplish its mission safely. For a second version, logic command functions are synthesized using Karnaugh diagrams, and after that, the numerical simulation is accomplished to validate the solution. We used the AMESim software to perform numerical simulations.
