Equivalence technology for reverberation field random surface pressure load model

A reverberation field and load technology, applied in the effective field, can solve the problems of low analysis efficiency of the random surface pressure load model of the reverberation field, and achieve the effect of shortening the design cycle, reducing the amount of calculation, and saving the design cost.

Active Publication Date: 2017-03-08
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 efficiency in the analysis of the random surface pressure load model of the reverberation field, thereby shortening the design cycle and saving design costs

Method used

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  • Equivalence technology for reverberation field random surface pressure load model
  • Equivalence technology for reverberation field random surface pressure load model
  • Equivalence technology for reverberation field random surface pressure load model

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Embodiment

[0062] 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=0.01m. 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. Substitute the value of each parameter into formula (16), get f c = 1200Hz.

[0063] Step (3.4): Calculate the critical frequency applicable to the equivalent completely random surface pressure load model:

[0064] f crit = f c +c 0 / l 0 (18)

[0065] l in the above formula 0 =1m is the unit length. will f c =1200Hz is substituted into formula (18), and f crit = 1540Hz.

[0066] Step (3.5): Determine that the applicable frequency range of the equivalent completely random surface pressure load model in step (2) is f≥f crit , that is, when th...

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Abstract

The invention discloses an equivalence technology for a reverberation field random surface pressure load model. The technology comprises the following steps of (1) performing equivalence on the reverberation field random surface pressure load model to form an equivalent complete random surface pressure load model; (2) determining an order of magnitude of an equivalent correlation function of the equivalent complete random surface pressure load model; and (3) determining a structure bending wavelength and a reverberation field load feature wavelength, then calculating a consistency frequency, and based on this, determining a suitable frequency range of the equivalent complete random surface pressure load model. The equivalence technology for the reverberation field random surface pressure load model, provided by the invention, is a technology for making a reverberation field load model equivalent to the complete random surface pressure load model; and by the technology, the calculation amount of structure dynamic response analysis under the effect of a reverberation field surface pressure load can be effectively reduced, the design cycle can be shortened, and the design cost can be reduced.

Description

technical field [0001] The invention belongs to the equivalent technical field of a random surface pressure load model, and in particular relates to an equivalent technology of a reverberation field random surface pressure load model. Background technique [0002] The high-intensity, broadband noise environment encountered by the spacecraft during the mission cycle will cause mechanical vibrations, which may cause structure-acoustic fatigue damage or failure of precision instruments and instruments. Therefore, the spacecraft must undergo a noise environment test on the ground before launch. The reverberation field test can effectively test the acoustic and vibration characteristics of spacecraft, and is one of the most common noise environment test methods. The reverberation room generally has better working performance in the middle and low frequency bands, but the sound field intensity generated in the high frequency band is low. In addition, the larger the size of the r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15
Inventor 张鹏费庆国吴邵庆李彦斌陈强
Owner SOUTHEAST UNIV
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