Method for calculating pulsating pressure load equivalent to vibration acceleration load
A technology of vibration acceleration and pulsating pressure, applied in the field of effective pulsating pressure loads, can solve problems such as judging structures, fatigue damage, etc., and achieve the effect of avoiding safety accidents and ensuring structural integrity
Active Publication Date: 2021-10-26
AECC COMML AIRCRAFT ENGINE CO LTD
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Problems solved by technology
Therefore, it is difficult to judge whether the structure has fatigue damage according to whether the splash plate exceeds the strain limit value
Method used
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Embodiment Construction
[0082] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The sensors or instruments used were not indicated by the manufacturer, and they were all conventional products that could be obtained from the market.
[0083] Taking the splash plate of the engine combustor flame tube as the test object, a method for calculating the pulsating pressure load equivalent to the vibration acceleration load is described through a specific example.
[0084] figure 1 and figure 2 Shown is a splash plate for an engine combustor flare. As shown, the splash plate includes a fl...
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The invention relates to a method for calculating a pulsating pressure load equivalent to a vibration acceleration load, which comprises the following steps of: (1) fitting a function, namely a first function, about the pulsating pressure load borne by a sample and sample strain below a first pulsating pressure load; (2) under the first vibration acceleration load, fitting a function about the vibration acceleration load borne by the sample and the strain of the sample, namely a second function; (3) based on the first function and the second function, establishing a function relationship between the pulsating pressure load borne by the sample and the vibration acceleration load borne by the sample, namely a third function; (4) extrapolating the third function towards the direction of the second pulsating pressure load, and establishing a function relationship between the pulsating pressure load borne by the sample and the vibration acceleration load borne by the sample above the first pulsating pressure load, namely a fourth function; and (5) according to the fourth function, calculating a pulsating pressure load equivalent to the vibration acceleration load target value.
Description
technical field [0001] The invention relates to the field of material detection, in particular to a method for calculating a pulsating pressure load equivalent to a vibration acceleration load. Background technique [0002] The deflector plate is located at the head of the flame tube, directly contacting the combustion flame, and the temperature can reach 900°C. If combustion oscillation occurs in the combustion chamber, the pulsating pressure load generated by unstable combustion acts on the surface of the splash plate, causing the splash plate to vibrate. If the oscillating combustion frequency is coupled with the natural frequency of the splashback, high stress may be generated. At the same time, the high-temperature environment will reduce the high-cycle fatigue performance of the material, which will further cause the vibration fatigue damage of the splashback. In the development of aero-engines, the core engine and the whole machine are tested for verification and ass...
Claims
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IPC IPC(8): G01N3/32G01N3/02
CPCG01N3/32G01N3/02G01N2203/0005G01N2203/0019G01N2203/0055G01N2203/0073G01N2203/0682G01N2203/0222Y02T90/00
Inventor 任敬琦杨眉李晓冬许璠璠
Owner AECC COMML AIRCRAFT ENGINE CO LTD