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Equivalent method for turbulent boundary layer loading model

A boundary layer and load technology, applied in the effective field, can solve the problem of low efficiency of load model analysis, and achieve the effect of shortening the design cycle, reducing the amount of calculation, and saving the design cost.

Active Publication Date: 2017-09-15
SOUTHEAST UNIV
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Problems solved by technology

Therefore, in the higher frequency band, effective measures need to be taken to solve the problem of low analysis efficiency of the above-mentioned turbulent boundary layer load model, thereby shortening the design cycle and saving design costs

Method used

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  • Equivalent method for turbulent boundary layer loading model
  • Equivalent method for turbulent boundary layer loading model
  • Equivalent method for turbulent boundary layer loading model

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Embodiment

[0059] Such as figure 2 As shown, taking a rectangular simply supported plate as an example, the consistency frequency is calculated. The size of the rectangular simply supported plate is: x axial length L x =1m, y-axis length L y =1m, thickness h=0.005m. The parameters of the material used for the rectangular simply supported plate are: elastic modulus E = 120GPa, material density ρ = 7800kg / m 3 , Poisson's ratio υ = 0.3. When the incoming flow velocity U=100m / s, substitute the value of each parameter into formula (8) to get f c = 102Hz.

[0060] After step (3.4), the applicable critical frequency of the equivalent completely random surface pressure load model is f crit = 408Hz.

[0061] After step (3.5), it is determined that the applicable frequency range of the equivalent completely random surface pressure load model is f≥f crit , that is, when the analysis frequency f≥408Hz, in this example, the turbulent boundary layer load model shown in equation (1) can be rep...

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Abstract

The invention discloses an equivalent method for a turbulent boundary layer loading model. The method comprises the following steps: (1) after equivalence of a turbulent boundary layer loading model, forming an equivalent completely random surface pressure loading model; (2) determining order of an equivalent correlation function of the equivalent completely random surface pressure loading model; (3) determining structure curved wavelength and turbulent boundary layer loading characteristic wavelength, so as to calculate consistency frequency, and determining appropriate frequency range of the equivalent random surface pressure loading model on the basis. The equivalent method for a turbulent boundary layer loading model is a technology which makes the turbulent boundary layer loading model equivalent to the completely random surface pressure loading model, and the technology can effectively reduce calculated amount of structural dynamic response analysis under action of the turbulent boundary layer loading, and design cycle is shortened, and design cost is saved.

Description

technical field [0001] The invention relates to the field of equivalent methods for random surface pressure load models, in particular to an equivalent method for turbulent boundary layer load models. Background technique [0002] As the spacecraft develops to a high flight speed, it faces severe random noise and other environments during the mission cycle, which may cause structural failure or failure of precision instruments and instruments. Therefore, in the design process of the spacecraft, the influence of mechanical vibration and noise needs to be considered. Experimental method, theoretical method and numerical method can be used to predict the dynamic response of the system under random noise excitation. Among them, the test method can obtain reliable results, but the cost of carrying out test analysis is high and the design cycle is long; the theoretical method is only suitable for simple systems, and it is difficult to solve the problem of dynamic response predict...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 费庆国张鹏李彦斌吴邵庆陈强姜东
Owner SOUTHEAST UNIV
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