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Design method of loudspeaker for active noise control of power transformer

A design method and loudspeaker technology, applied in the direction of sensors, electrical components, etc., can solve the problem of not finding the optimal design of the loudspeaker, and achieve the effect of suppressing the water bed effect and being flexible, convenient and efficient.

Inactive Publication Date: 2012-08-15
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, no method has been retrieved to optimize the design of loudspeakers for active noise control of power transformers using a band-pass acoustic structure

Method used

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  • Design method of loudspeaker for active noise control of power transformer
  • Design method of loudspeaker for active noise control of power transformer
  • Design method of loudspeaker for active noise control of power transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] Example: The control source in the noise active control system is designed using the design method proposed in the present invention.

[0017] First, the characteristics of the loudspeaker unit are obtained. Generally, a unit with a lower resonant frequency and a better quality factor is selected. The present invention adopts a southern whale loudspeaker. The TS parameters were measured, and the main results are shown in Table 1:

[0018] Table 1 TS parameters of the speaker unit

[0019] name

symbol

size

The product of the magnetic induction in the voice coil magnetic gap and the length of the voice coil wire

Bl

5.907Tm

Voice coil DC resistance

RE

7.24Ω

[0020] Diaphragm effective area

S D

95.03cm 2

Equivalent Sound Quality of Loudspeaker Vibration System

M AD

117.11kg / m 4

Equivalent Sound Compliance of Speaker Support System

C AS

3.97×10 -8 m 5 / N

...

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Abstract

The invention discloses a design method of a loudspeaker for active noise control of a power transformer. The loudspeaker manufactured through the design method consists of a loudspeaker unit, three cuboid cavities and three inverter tubes, can serve as a control source in an active control system of the power transformer and is specially used for reducing components close to 100Hz, 200Hz and 300Hz in radiation noises of the transformer. Compared with the conventional loudspeaker, according to the loudspeaker disclosed by the invention, frequency response values close to the frequencies are relatively high, frequency response values at other frequency ranges are attenuated quickly, and the loudspeaker is small in volume and high in efficiency and can effectively restrain a waterbed effect in a feedback control system.

Description

1. Technical field [0001] The invention relates to a loudspeaker design method, in particular to a band-pass loudspeaker design method used as a control source in active noise control of a power transformer. 2. Background technology [0002] Active noise control technology is an effective means of noise propagation path control (Chen Ke'an, Active Noise Control, Beijing: National Defense Industry Press, 2003). The active control systems that have been used so far include: Active anti-noise earmuffs (Wang Liansheng, Zhang Libin, Active Noise Cancelling Earmuffs, Electroacoustic Technology, 10, 5-10, 1994; Zhang Ruihua, Adaptive Active Anti-noise Earmuffs DSP Realization of Hood, Electro-Acoustic Technology, 3, 56-58, 2003), Active Noise Control in Ducts (Ren Yanrong, Research on Adaptive Active Control of Low-Frequency Noise in Air Conditioning and Ventilation Ducts, Doctoral Dissertation of Xi'an Jiaotong University, 1995; Zeng Cheng, Zhang Qizhi, Experimental Research on A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R9/06
Inventor 邓怡情陶建成邱小军
Owner NANJING UNIV
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