AES Journal Forum

Practical Method of Thermal Parameter Identification for Loudspeakers

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An identification method has been proposed to obtain the thermal parameters of thermal models. For most loudspeakers, eddy current can be neglected in the low-frequency range and forced convection can be neglected in the high-frequency range. Therefore, the proposed method selects a partition frequency to neglect both of these factors and divides thefrequency range into two parts. The linear parameters are directly obtained at the partition frequency without the influence of forced convection and eddy current, making the method practical. As the linear parameters are obtained at the partition frequency, the selection of the partition frequency may cause deviations. Forced convection and eddy current are identified in the low- and high-frequency ranges, respectively. All thermal parameters are identified by employing the proposed method by measuring and fitting the temperature curves of the voice coil at several single frequencies. The temperature curves of single-tone, two-tone, and white noise signals are measured and compared with the predicted curves according to identified parameters. The results show that the curves predicted by the proposed method agree well with the measured curves, demonstrating the validity and accuracy of the method.

JAES Volume 67 Issue 4 pp. 213-221; April 2019
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AES - Audio Engineering Society