A Numerical Calculation Method for Predicting Fuzzy and Uncertain Sound Pressure in Automobile Interior
An automotive interior, numerical calculation technology, applied in the field of mechanical engineering, which can solve problems such as system response disturbances
Active Publication Date: 2019-05-03
BEIHANG UNIV
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For a complex system, even a small uncertainty factor may have a significant disturbance to the final system response through propagation, accumulation and diffusion among subsystems
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[0059] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0060] The invention is applicable to the prediction problem of sound pressure inside the car with fuzzy and uncertain parameters. In the embodiments of the present invention, the noise prediction of an interior cabin of a certain automobile model is taken as an example to specifically illustrate the numerical calculation method of fuzzy and uncertain sound pressure. In addition, this numerical calculation method of fuzzy and uncertain sound pressure inside the car can be extended to the response calculation of other structure-acoustic coupling systems with fuzzy parameters.
[0061] The calculation process of the sound pressure inside the car is as follows: figure 1 As shown, the coupling effect of the structure and the sound field is fully considered, the finite element equation of the coupling system is established, and the uncertain parameters are ...
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The invention discloses a numerical computation method for predicting fuzzy uncertain sound pressure in automobiles. The method comprises the following steps: carrying out finite element modeling on an automobile structure and an interior sound field; constructing a structure-sound coupling system by considering the coupling function of the structure and the sound field, so as to obtain a finite element discrete equation of the system; representing an uncertain input parameter of the structure-sound coupling system by utilizing a fuzzy variable, so as to obtain a fuzzy finite element equation of the system; further decomposing the interval variable under each cut set level by utilizing a cut set operation and a sub-interval theory, and rewriting the fuzzy finite element equation into a group of sub-interval finite element equation; solving the sub-interval finite element equation on the basis of a first order perturbation method; and recombining the sound pressure intervals under all the cut set levels by utilizing a fuzzy decomposition theorem so as to finally obtain a subordinating degree function of the fuzzy uncertain sound pressure. The method disclosed in the invention has the advantage of effectively improving the computation efficiency under the premise of ensuring the computation accuracy and satisfying the engineering requirements and the advantage cannot be realized by common commercial software.
Description
technical field [0001] The invention belongs to the field of mechanical engineering, and in particular relates to a numerical calculation method for predicting fuzzy and uncertain sound pressure inside an automobile. Background technique [0002] With the improvement of living standards and the progress of science and technology, the noise problem has been paid more and more attention by people. Noise reduction engineering is one of the most important topics today, no matter from the comfort of daily life or the safety and combat performance in the military field. Noise problems are particularly prominent in the automotive industry. Among them, the noise in the cabin of the car will not only damage the health of the passengers, but also cause the fatigue of the driver, which will indirectly affect the driving safety; the structural vibration caused by excessive noise will accelerate the aging of auto parts and shorten the service life of the car. . [0003] Acoustic analy...
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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/23G06F2119/10Y02T90/00
Inventor 邱志平王冲王晓军胡永明李云龙仇翯辰陈贤佳郑宇宁张泽晟
Owner BEIHANG UNIV