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Method for compiling severe gust spectrum based on durability of discrete gust transcendental curve

A technology that surpasses numbers and durability. It is used in electrical digital data processing, special data processing applications, instruments, etc. to achieve the effect of increasing the total number of cycles and the overload amplitude.

Pending Publication Date: 2021-02-26
BEIHANG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method based on the durability of discrete gust transcendence curves to compile severe gust spectra, to solve the problems mentioned above

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  • Method for compiling severe gust spectrum based on durability of discrete gust transcendental curve
  • Method for compiling severe gust spectrum based on durability of discrete gust transcendental curve
  • Method for compiling severe gust spectrum based on durability of discrete gust transcendental curve

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example

[0106] Example: The following takes the P-3C aircraft as an object to compile the severe gust spectrum, and at the same time compile the average gust spectrum for comparison.

[0107] (1) Step 104, determine the length and composition of the "fly-continu-fly" block spectrum according to the aircraft life index, service profile and proportion thereof;

[0108] This example only considers one usage profile, so it is not necessary to consider the influence of the usage ratio of the profile. The basic parameters of the P-3C aircraft are shown in Table 2, and the profile parameters are shown in Table 3. The stress level of 1g overload under a given nominal weight is σ 1g =80MPa.

[0109] The design life is 18,000 flight hours, and the section length is 10.1 flight hours, so the expected number of flights is 1782, rounded to 1780, and the block spectrum contains 178 flights.

[0110] Table 2 Basic parameters of P3-C aircraft

[0111]

[0112] Table 3 Typical parameter values ​...

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Abstract

The invention relates to the technical field of severe gust spectrum compilation, in particular to a method for compiling a severe gust spectrum based on durability of a discrete gust transcendental curve. According to the method, a gust speed curve corresponding to 90% of aircraft use conditions is obtained through statistical analysis and extrapolation of gust speed transcendental curve families, a severe gust spectrum is compiled by adopting a Twist compiling method, an overload spectrum is further calculated, a flight overloading spectrum is further compiled, and the overload amplitude ofthe severe spectrum is improved compared with an average spectrum. The total number of cycles is obviously increased. According to the method, in the aircraft structure design shaping stage, the use safety of the structure under the use condition is guaranteed, factors influencing life dispersion are comprehensively considered, and durability analysis, testing and full-size fatigue testing are conducted to evaluate the safety life of the cluster structure. At present, a severe spectrum is adopted in aircraft structure durability analysis and test to reflect the severe use condition of an aircraft in design use distribution, so that 90% of aircrafts of an aircraft fleet expect to meet the design service life.

Description

technical field [0001] The invention relates to the technical field of severe gust spectrum compilation, in particular to a method for compiling severe gust spectrum based on the durability of discrete gust transcendence curves. Background technique [0002] At present, the methods for compiling severe gust spectrum for durability design mainly include: (1) Discrete gust model. The discrete gust model believes that the reason why the wind speed of the atmosphere deviates from the average state is that there are discrete and unrelated turbulent groups in the atmosphere. The wind speeds in different regions of these turbulent groups are different. The average wind speeds are added together to form gusts. For one-dimensional simplification, the gust structure is simplified into a "1-COS" shaped pulse. Taking the vertical gust as an example, it is believed that along the flight trajectory, the vertical gust speed of a turbulent group from the edge to the center and then to the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/20G06F113/08G06F119/02G06F119/04
CPCG06F30/15G06F30/20G06F2113/08G06F2119/02G06F2119/04Y02T90/00
Inventor 贺小帆朱俊贤
Owner BEIHANG UNIV
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