Method for calculating maximum deflection of tires of aircraft taking off in stress state

A technology of aircraft tires and calculation methods, which is applied in the directions of calculation, computer-aided design, design optimization/simulation, etc., and can solve problems such as low calculation accuracy and inapplicability of calculation methods.

Active Publication Date: 2018-07-20
SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for calculating the maximum sinkage of aircraft tires that take off under pressure. Using the nominal size of the tires, the calculation method for the maximum sinkage can be established by applying the resultant load under pressure to solve the current problem. The calculation method is not applicable or the calculation accuracy is low

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  • Method for calculating maximum deflection of tires of aircraft taking off in stress state
  • Method for calculating maximum deflection of tires of aircraft taking off in stress state
  • Method for calculating maximum deflection of tires of aircraft taking off in stress state

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Embodiment Construction

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention.

[0026] Take the nose landing gear tire of an aircraft taking off under certain pressure as an example, the known data is shown in the table below, and the calculation process of the sinkage δ is as follows:

[0027]

[0028] First, calculate the front tire vertical load F for the case under compression y

[0029]

[0030] Among them, the weight of the whole machine is distributed in the mass force F of the nose landing gear n for

[0031]

[0032] In the above formula, F y is the vertical load borne by the front tire; F c is the compressive load, α is the ejection angle; F hb is the pinning load, and β is the pinning angle. f n is the mass force of the nose landing gear ...

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Abstract

The invention relates to a method for calculating the maximum deflection of tires of an aircraft taking off in a stress state, and belongs to the field of aircraft design. The method includes the steps of firstly, calculating the tire vertical force Fy in the stress state; secondly, determining the tire deflection delta of the tires according to the tire vertical force Fy. Compared with the method, the method has the advantages that the problem that the calculation of the maximum deflection of the undercarriage tires of the land-based aircraft is precise in the prior art, but large errors exist in the calculation of the maximum deflection of the undercarriage tires of the aircraft taking off in the stress state in the prior art is solved, the method is suitable for calculating the maximumdeflection of the undercarriage tires of the aircraft taking off in the stress state, and errors are within 5% compared with measured data; the loads of catapult bars and holdback bars are consideredin the method but not considered in the prior art; the constant-temperature process is adopted for gas inside tires when the compression amount of the tires is calculated in the prior art, but rapid compression characteristics are considered and the thermal insulation process is adopted in the method.

Description

technical field [0001] The invention belongs to the technical field of aircraft design, and in particular relates to a method for calculating the maximum sinkage of an aircraft tire that takes off under pressure. Background technique [0002] The landing gear tire of a certain type of aircraft is a special type of tubeless tire, see attached figure 1 , which consists of a tire 1 and a wheel 2. This type of tire needs to meet the strict load-bearing design requirements of the aircraft under pressure. However, for this type of tire, the key issue is exactly how to calculate the maximum sinkage of the tire under pressure, so as to ensure that the tire does not blow out or be flat under pressure. Contents of the invention [0003] The purpose of the present invention is to provide a method for calculating the maximum sinkage of aircraft tires that take off under pressure. Using the nominal size of the tires, the calculation method for the maximum sinkage can be established b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/20G06F2119/06
Inventor 姚念奎王佳莹卢学峰杜金柱
Owner SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
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