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A frequency band identification method for thermal parameters of loudspeaker

An identification method and speaker technology, applied to instruments, sensors, electrical digital data processing, etc., can solve problems such as difficulty in parameter identification, and achieve the effects of accurate parameter identification, auxiliary structure optimization, temperature control, and good temperature distribution

Pending Publication Date: 2019-03-15
NANJING UNIV
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Problems solved by technology

[0004] Usually, the parameters of the nonlinear thermal model include linear parameters, forced convection and eddy current, and the identification of parameters is difficult

Method used

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  • A frequency band identification method for thermal parameters of loudspeaker
  • A frequency band identification method for thermal parameters of loudspeaker
  • A frequency band identification method for thermal parameters of loudspeaker

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Embodiment Construction

[0037] The invention proposes a method for identifying thermal parameters of a loudspeaker, which separately identifies linear thermal parameters, forced convection parameters and eddy current parameters by means of frequency division, thereby improving the efficiency and accuracy of thermal parameter identification. The following will be described in conjunction with examples.

[0038] A moving-coil loudspeaker unit is actually measured by the present invention, and its thermal parameters are identified. The diameter of the unit is 13.5cm. In the figure, dust cap 1, air 2, and magnetic gap 3 are shown.

[0039] Firstly, the resonant frequency fs of the unit is measured to be 66Hz by electro-acoustic measuring instruments, and the thermal division frequency point is selected as 1000Hz.

[0040] Use a 1000Hz single-frequency signal to drive the speaker to achieve thermal equilibrium, and measure the temperature rise curve of the voice coil during the whole process. According ...

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Abstract

A method for identifying thermal parameters of loudspeakers in different frequency bands is disclosed. Firstly, the resonant frequency of loudspeakers is measured and the thermal frequency dividing point of loudspeakers is selected. The thermal frequency division point is in the middle frequency band, which should be much larger than the resonant frequency and much smaller than the maximum operating frequency. Secondly, the influence of forced convection and eddy current is ignored at the frequency dividing point, and the voice coil temperature curve is measured at the frequency dividing point. According to the theoretical formula (expression) of voice coil temperature, the curve fitting is carried out, and the linear thermal parameters are obtained. Then, a few measuring frequency pointsare selected in the whole frequency band to measure the temperature curve of the voice coil. Based on the linear thermal parameters, the thermal parameters of forced convection and vortex are calculated. Finally, the voice coil temperature of other frequency points is predicted according to all the thermal parameters. In the frequency band below the frequency dividing point, ignoring the effect ofvortex, choosing a small number of measuring frequency points, measuring the voice coil stable temperature, calculating the total forced convection thermal resistance, and then fitting the forced convection parameters: velocity factor and displacement factor.

Description

technical field [0001] The invention relates to a frequency-divided parameter identification method, which is used for identifying the thermal parameters of the loudspeaker, especially for assisting in analyzing the voice coil temperature of the loudspeaker. Background technique [0002] A loudspeaker is an electroacoustic transducer that converts electrical energy into sound energy and radiates it into a medium. The electro-acoustic conversion efficiency of the loudspeaker is very low, usually less than 5%. Most of the electrical energy is converted to heat and causes the speaker components such as the voice coil to heat up. Excessive temperature limits the maximum power of the speaker, and causes parameter drift, power compression and other problems, and even burns out the speaker in severe cases. [0003] Thermal models are often used to analyze the thermal problems of loudspeakers. By modeling the thermal process inside the loudspeaker, Henricksen proposed the equival...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H04R9/02
CPCH04R9/02G06F2119/08G06F30/20
Inventor 沈勇章志亮夏洁
Owner NANJING UNIV
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