Design method of micro perforated plate sound absorption body with maximized average sound absorption coefficient

Abstract

The invention provides a design method of a micro perforated plate sound absorption body with maximized average sound absorption coefficient. The method comprises the following steps of initializing aproblem parameter and an algorithm parameter; randomly initializing M solution vectors in a definition domain, wherein each solution vector includes four problem variables which are respectively perforation diameter, plate thickness, the percentage of the perforation total area in a whole plate, and thickness of a cavity behind the plate; updating the solution vector in a population; continuouslyimproving the quality of the whole population; judging a program termination condition. By the design method provided by the invention, the quality of the whole population is continuously improved bygenerating new solutions and updating poor solutions, so that the average sound absorption coefficient of an optimum solution can fast rise to a relatively high level in few iterations; the sound absorption coefficients of all sampling frequency points in the whole frequency range are comprehensively considered, so that the micro perforated plate sound absorption body can effectively inhibit thenoise in the specific frequency range; the influence of the noise containing various frequency components on people and surroundings is reduced to the maximum degree.

Description

technical field [0001] The invention relates to a method for designing a micro-perforated sound-absorbing body, in particular to a design method for a micro-perforated sound-absorbing body that maximizes the average sound absorption coefficient. Background technique [0002] Noise refers to the sound produced when the sounding body vibrates irregularly. From a physiological point of view, the sounds that affect people's normal rest, study and work are all noises. Since the industrial revolution, with the rapid development of science and technology, a large number of mechanical equipment have emerged as the times require. They have improved the productivity of workers, improved people's quality of life, and greatly promoted the development of the entire society, but at the same time inevitably brought More, stronger noise. Noise has clearly become one of the greatest public enemies of mankind today. [0003] In order to reduce the adverse effects of noise on humans and the...

AI Technical Summary

Problems solved by technology

However, based on the stringent requirements of people in pursuit of a noise-free environment, the existing micro-perforated plate sound absorber design method is difficult to optimize the noise reduction in the entire frequency range due to the limitation of design ideas.

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