Method for quickly analyzing landing load of support arm type undercarriage

Abstract

The invention belongs to the technical field of aircraft structural strength design load analysis, and particularly provides a method for quickly analyzing landing load of a support arm type undercarriage. According to the method, a large-side-angle support arm type undercarriage structure is simplified into a mass-spring system on the basis of the energy conservation principle, in the system, theweight of an airplane is simplified and concentrated to be M, the large-side-angle support arm type structure is simplified into a spring model, tires are simplified into a spring model, and connection of support arms and the tires is simplified into series connection of two springs; an energy equation for simplifying the large-side-angle support arm type structure into the spring model is solved, and an energy equation for simplifying the tires into the spring model is solved; and then, the obtained energy equation is substituted into an energy conservation equation, the maximum vertical load of the landing load of the undercarriage is solved, and the loads in the lateral direction and the heading direction on the undercarriage during landing is calculated. According to the method provided by the invention, a complex calculation model does not need to be established, the derivation process is simple, the obtained landing load is effective and reliable, and the requirements of engineering design can be met.

Description

technical field [0001] The invention belongs to the technical field of aircraft structural strength design load analysis, and specifically proposes a quick analysis method for landing load of a support arm type landing gear. Background technique [0002] Modern aircraft adopt the front three-point landing gear arrangement scheme, the two main landing gears are arranged behind the center of gravity of the aircraft, and the front landing gear is arranged directly under the nose of the aircraft. The advantages of the front three-point landing gear are that the resistance is small and the direction is stable when the aircraft is sliding , Strong braking will not cause overturning, short gliding distance, good vision, avoiding damage to the runway by the gas emitted by the engine, etc. From the perspective of the structure of modern aircraft landing gear, landing gear mainly includes types such as prop type landing gear and rocker type landing gear. [0003] Strut landing gear 1...

AI Technical Summary

Problems solved by technology

[0037] The design of the landing gear with the oil-pneumatic buffer structure is too complicated and the economy is poor. With the development of the times, the demand for light aircraft and drones is increasing. The take-off weight of this type of aircraft is about 1 ton, and the weight coefficient is small. , low use requirements, easy operation, cheap price, simple structure design, low development and maintenance costs, high reliability, so large side arm landing gear is undoubtedly a kind of aircraft for this type of aircraft Ideal landing gear structure form

For the ground load calculation of this type of high-side angle outrigger landing gear, there is no relevant design standard for ground load calculation

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