Capillary flow noise analysis and structural transformation design system

Abstract

The invention discloses a capillary flow noise analysis and structural transformation design system, which comprises the following steps of S1, building a parameterized model of an outlet of a capillary; S2, starting an optimization flow; S3, calculating a one-dimensional mathematical model of the capillary, giving import and export conditions of an outlet end of the capillary, calculating a simulation result of fluid mechanics to obtain flowing information, adopting the information as an input condition for calculating acoustic analysis, carrying out accurate sound field simulation, and adopting a final result of acoustic analysis as a noise assessment target of a current capillary structure; S4, optimizing an algorithm; S5, judging whether a noise structure meets an optimal target value or not, if yes, adopting the noise structure as an optimal result and outputting, if not, returning to the S4 step for re-optimizing the algorithm until the noise structure meets the optimal target value, and completing the result output of the whole system. The invention provides a universal, accurate and low-cost capillary noise reduction improvement system independent of people, and achieves the aim of engineering application.

Description

technical field [0001] The invention relates to the technical field of capillary flow noise, in particular to a capillary flow noise analysis and structural transformation design system. Background technique [0002] For a long time, noise and vibration have always been a major problem for refrigeration equipment manufacturers and an important indicator of consumer satisfaction. As the only dynamic moving part in the refrigeration system, the compressor is the main noise source and excitation force of the refrigeration system. The noise and vibration of the compressor have a decisive impact on the noise characteristics of the refrigeration equipment. For this reason, the vibration reduction and noise reduction of compressors has been deeply studied, and some effective methods have been proposed, such as improving the shape of the compressor shell, improving the design of the muffler, and so on. After the manufacturer adopts the mute technology, the overall noise level of th...

AI Technical Summary

Problems solved by technology

For different parameters and different types of refrigeration systems, the existing technology achieves different effects, and specific problems must be analyzed in detail;

[0007] (2) The existing technology cannot obtain the mechanism of noise generation

Most of the data in the existing technology is obtained through experimental measurement, but due to the small size of the capillary, the experimental measurement is difficult, and the existing technology cannot fully obtain the flow sound information in the capillary, so the mechanism of noise generation cannot be fully understood;

[0008] (3) Capillary noise reduction effect is not complete

Although the noise reduction levels of these commonly used solutions are different, they can all reduce the noise of the air conditioner. However, when customers have high requirements for noise quality, the above traditional noise reduction technologies are difficult to meet.

[0009] (4) The cost of existing technology is high

[0011] (1) The accuracy of computational fluid dynamics analysis and computational acoustics analysis is greatly affected by the given conditions

The accuracy of the numerical calculation is closely related to the given accuracy of the flow conditions at the inlet and outlet of the capillary. Usually, the flow conditions at the inlet and outlet of the capillary change with time, and it is usually difficult to give this condition accurately;

[0012] (2) The diameter of the capillary is small, but the length is long. Taking a refrigerator as an example, the diameter is usually about 0.5 mm and the length is about 3 meters. It takes a very long time to perform computational fluid dynamics analysis and computational acoustic analysis on it. Usually the calculation cycle is based on weeks or even months. If iterative adjustments are considered during the improvement process, the calculation time will increase linearly.

This is unacceptable for engineering problems;

[0013] (3) The method of proposing an improvement plan based on the analysis results requires the implementer to have strong professional knowledge and practical experience, and the improvement effect is greatly affected by the personal technical level

At the same time, each adjustment requires personnel participation, which takes up a lot of personnel time and is inefficient

[0014] The noise reduction technology based on the numerical simulation method has not been applied in engineering due to the limitation of calculation accuracy and calculation time, and is highly dependent on human experience and knowledge level.

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