Airplane air tightness test method

Abstract

A method is used for a low-pressure large-volume air tightness test for testing airplane air tightness, and the invention relates to an airplane air tightness test method. The method is characterized in that an industrial control computer (6) is used to control the gas flow injected into an airtight cabin of an airplane, and two control modes, coarse tuning control and fine tuning control, are adopted. When gas charging of the airplane airtight cabin has no air pressure gradient requirement, the method mainly comprises the steps that: the industrial control computer 6 opens a flow coarse tuning path 2 to a largest flow, gas is rapidly injected until the air pressure reaches 90% of a set air pressure; and a flow coarse tuning path 2 is controlled so as to reduce the gas flow to 1 / 4 of the original value. When gas charging of the airplane airtight cabin has an air pressure gradient requirement, the method comprises the following steps that: the industrial control computer 6 controls the gas flow of the flow coarse tuning path to the 1 / 4 maximum value, and a flow fine tuning path 3 is adjusted according to an air pressure value fed back by a digital air gauge 5 so as to stabilize the air pressure gradient. According to the invention, the air tightness detection can be carried out on the low-pressure large-volume airplane airtight cabins of different precision requirements.

Description

technical field [0001] The method is used for a low-pressure large-volume airtight test for testing the airtightness of an aircraft, and belongs to the technology in the field of aviation flight tests. Background technique [0002] In order to complete the aircraft design finalization test flight, it is necessary to modify various types of aircraft to varying degrees. Refitting construction sometimes damages the airtightness of the aircraft to varying degrees, and the airtightness inspection of the cabin becomes a key part after the post-repair work is completed. If the airtightness does not meet the standard, it will cause the cabin to lose pressure at high altitude, endangering the safety of the pilot. [0003] The volume of the airtight cabin of the aircraft is large, and the inflation time is long during the airtight test. Some models have requirements for the pressure gradient during the inflation process, and the internal pressure needs to change smoothly. If the ai...

AI Technical Summary

Problems solved by technology

It is very difficult to control the air pressure gradient to keep constant by manually controlling the intake valve. It is necessary to design a high-precision and fast method for detecting the airtightness of the aircraft.

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