Airplane emergency brake system and design method thereof

Abstract

The invention provides an airplane emergency brake system and a design method thereof. A brake oil port of a hydraulic electromagnetic valve in the airplane emergency brake system communicates with anoil inlet of a hydraulic cylinder seat of an airplane wheel. An oil inlet of a hydraulic pressure reducing brake valve is externally connected with a hydraulic source. One binding post of a single-pole double-throw switch of a hydraulic relay is connected with a direct current power supply; and another binding post of the single-pole double-throw switch of the hydraulic relay is connected with anelectromagnet of a hydraulic electromagnetic valve through a lead. When the oil liquid pressure from the hydraulic pressure reducing brake valve reaches a contact switch-on pressure of the hydraulicrelay, a contact of the hydraulic relay is switched on; and moreover, the direct current power supply is connected to the electromagnet of the hydraulic electromagnetic valve so that the hydraulic electromagnetic valve releases pressure, and therefore, the pressure of the emergency brake system with an active anti-skid braking function is reduced. The airplane emergency brake system has the advantages that the emergency brake system with the active anti-skid braking function can compare an actual braking pressure with a braking pressure value set by the system so as to actively adjust the braking pressure, and therefore, the active skid prevention purpose is achieved.

Description

technical field [0001] The invention relates to the field of aircraft braking systems, in particular to an emergency braking system with an active anti-skid braking function, and a method for optimizing parameters of various accessories in the system. Background technique [0002] In order to make the aircraft land safely and ensure the safety of the ground control of the aircraft, according to the requirements and regulations for the emergency braking system in the general specification for aircraft wheel anti-skid braking control system (GJB2879A-2008): "When the normal braking system fails or fails, the emergency braking The system must safely stop the aircraft, and the emergency braking system and the normal braking system must be independent of each other.” [0003] Aircraft emergency braking systems mostly use manual braking, which consists of a single hydraulic pressure relief brake valve or a pneumatic pressure relief brake valve. The emergency braking system has no...

AI Technical Summary

Problems solved by technology

The emergency brake system relies on the pilot to manipulate the emergency brake handle to make the emergency brake valve output brake pressure to realize emergency brake control to stop the aircraft. However, the emergency brake system without active anti-skid function has no anti-skid function. Under special circumstances, when the combined moment of the ground decreases sharply, as long as the braking torque is greater than the combined moment of the ground, the emergency braking system cannot relieve the pressure through active anti-skid, which will cause wheel drag or blowout accidents.

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