Helmholtz resonator with adjustable expansion extension neck and adjusting method thereof

An adjustment method and adjustable technology, applied in the direction of pipes/pipe joints/pipe fittings, mechanical equipment, pipe components, etc., can solve the problems of reduced muffler performance and narrow muffler frequency band, so as to improve muffler performance and better muffler. effect, the effect of maximizing the amount of noise reduction

CN112664744APending Publication Date: 2021-04-16JIANGSU UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-04-16

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Abstract

The invention discloses a Helmholtz resonator with an adjustable expansion extension neck and an adjusting method thereof. The Helmholtz resonator comprises a main pipeline, a resonant cavity, a control system and a gear transmission system, wherein the control system is connected with the main pipeline and used for collecting noise signals, and the gear transmission system is arranged in the resonant cavity and is in signal connection with the control system; and a first expansion extension neck and a second expansion extension neck which are used for adjusting the resonant frequency are arranged in the resonant cavity, and are symmetrically arranged at an opening part, communicating with the main pipeline, of the resonant cavity. According to the adjusting method, the input end of an active control system is embedded into the gas inlet end of the main pipeline, the output end of the active control system is connected with the gear transmission system, and rotation of the expansion extension neck is adjusted based on the collected gas speed. By adjusting rotation of the second expansion extension neck, the structure of the expansion extension neck is adjusted, the transmission loss value can be increased, the number of formants can be increased, the silencing frequency band can be widened, and the good silencing effect is achieved.
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Description

technical field

[0001] The invention relates to a resistance muffler, in particular to a Helmholtz resonator with an adjustable extended extension neck and an adjustment method thereof. Background technique

[0002] The Helmholtz resonator has a simple structure and is widely used as a noise reduction device to control combustion-related engine exhaust noise. As a pipe bypass muffler, a Helmholtz resonator is used to increase the acoustic noise transmission loss. The traditional Helmholtz resonator usually has only one formant, which is easy to cause the sound attenuation performance to be greatly reduced due to environmental factors, and due to the problem of a single formant and narrow anechoic frequency band, in some The application cannot match the noise frequency, which leads to certain limitations in practical application. Therefore, it is necessary to optimize the structure of the traditional Helmholtz resonator. Contents of the invention

[0003] Purpose of the i...

Examples

Embodiment Construction

[0026] The present invention will be further described below in conjunction with drawings and embodiments.

[0027] see Figure 1-5 As shown, a Helmholtz resonator with an adjustable extended extension neck includes a main pipe 1, and the noise airflow is introduced into the main pipe 1, and a speed sensor 5 is installed on the main pipe 1, and the speed sensor 5 adopts Shanghai East Tai 4-20mA model, embedded on the inner wall of the main pipeline, fixed with silicone seal rings on the left and right sides, as the input end of the control system; the speed sensor 5 is sequentially connected with the signal processor 6, the servo motor controller 7 and the servo motor 8 Signal connection, the signal processor 6 adopts the model of Fangkong SK2011, the servo motor controller 7 adopts the supporting controller of the Hechuang servo motor 60ST-H model, and the servo motor 8 adopts the Hechuang servo motor 60ST-H model. A resonant cavity 3 is connected to the main pipeline 1 thro...