New ejection delivery speed measurement method for ejection seat

An ejection seat and velocity measurement technology, which is applied in ejection/disembarkation devices, aircraft component testing, etc., can solve problems such as the inability to know the initial value and the inability to perform integral operations, and achieves a small error, short cycle, and low cost. Effect

Inactive Publication Date: 2020-02-18
SHENYANG AEROSPACE UNIVERSITY
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Problems solved by technology

Considering the independence of the measurement, that is, if the relevant data is not obtained from the aircraft data bus, the initial value cannot be known, so the integral operation cannot be performed

Method used

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  • New ejection delivery speed measurement method for ejection seat
  • New ejection delivery speed measurement method for ejection seat
  • New ejection delivery speed measurement method for ejection seat

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Embodiment Construction

[0028] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] Such as figure 1 As shown, the method of this embodiment is as follows.

[0030] Step 1: Divide the ejection seat ejection process into two stages, establish a mathematical model according to the specific conditions of each stage, and compile a computer simulation calculation program;

[0031] The first stage: the ejection seat is stuck in the guide rail groove by two pairs of pulleys, and the ejection seat system can only move along the direction of the guide rail and cannot rotate. At this time, the ejection seat system is affected by the thrust and gravity of the rocket package;

[0032] The second stage: the ejection seat only has a pair of pulleys in the ejec...

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Abstract

The invention discloses a new ejection delivery speed measurement method for an ejection seat, and belongs to the technical field of aviation ejection life-saving. According to movement characteristics of the ejection seat, based on a computer simulation method, a mapping relation model of body axis x-direction acceleration value and ejection velocity of the ejection seat based on a BP neural network is established in advance; a body axis x-direction acceleration sensor is mounted in an appropriate position of the ejection seat, and the body axis x-direction acceleration value of the ejectionseat at that moment of delivery is measured; and the corresponding ejection delivery speed is calculated on the basis of the acceleration value according to the mapping relation model which is established in advance. According to the method, the probability of inaccurate measurement caused by blockage of an airspeed head and influence of an external flow field is avoided, slight errors are produced, and engineering application requirements are met.

Description

technical field [0001] The invention relates to the technical field of aviation ejection lifesaving, in particular to a novel ejection seat ejection speed measurement method. Background technique [0002] The ejection seat is the main life-saving equipment for the pilot to get out of the aircraft in an emergency. With the expansion of the flight envelope of fighter jets, the ejection seat must meet the life-saving requirements under a wide range of ejection speeds and ejection heights. Therefore, the division of ejection modes according to different ejection conditions has become the key technology of the third-generation ejection seat. The principle is to measure the ejection speed and height when the ejection is started by the sensor, and determine the opening time of the lifesaving parachute according to the pre-set program control mode. The main types of ejection seats in active service are equipped with pitot tubes to measure the velocity value at the moment of ejecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64F5/60B64D25/10
CPCB64F5/60B64D25/10
Inventor 毛晓东白庭蝶冯晓晗庞丽萍
Owner SHENYANG AEROSPACE UNIVERSITY
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