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电动式扬声器单元支撑系统的蠕变效应 被引量：3

Creep Effect of Electrodynamic Loudspeaker Suspension
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摘要 电动式扬声器单元支撑系统的蠕变效应表现在扬声器单元的位移在共振频率以下会有所上升。因此在扬声器单元线性集中参数模型中仅仅用线性弹簧并联简单的粘滞阻尼来代表支撑系统是不够的。在此引入对数蠕变模型,通过测量实际的扬声器单元与传统的线性模型进行对比,结果表明对数蠕变模型与实际测量结果更吻合。 Creep effect of electrodynamic loudspeaker suspension can be observed as an increase in displacement far below the resonance frequency. The creep effect means that the suspension cannot be modeled as a linear spring with simple viscous damping in parallel. The creep effect is investigated and the creeping displacement response dependent on the step - like excitation voltage is measured on several real loudspeakers. The LOG creep model （two versions） is introduced here, replacing the simple linear compliance with a dynamic transfer function in the traditional linear low - frequency loudspeaker model. Experiments on real loudspeakers demonstrate that the expanded model is able to fit the measured frequency much better than the traditional model.
作者 夏洁 沈勇
机构地区 南京大学声学研究所近代声学教育部重点实验
出处 《电声技术》 2011年第11期21-24,29,共5页 Audio Engineering
关键词 支撑系统 蠕变效应 对数模型 最小二乘法 suspension creep effect the LOG model least squares method
分类号 TN643 [电子电信—电路与系统]
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参考文献13

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同被引文献22

  • 1Agerkvist Finn, Thorborg K, Tinnggaard C. A study of the creep effect in loudspeaker suspension. 125^th AES Conven- tion, San Francisco, USA, 2005:6582.
  • 2Thorborg K, Futtrup C. Electrical dynamic transducers model incorporating semi-inductance and means for short- ing ac magnetization. J. Audio Eng. Soc., 2011; 59(9): 612-627.
  • 3Finn T A. Nonlinear viscoelastic models. 131st AES Con- vention, New York, USA, 2011:8500.
  • 4Uesako N, Kajikawa Y. Influence of nonlinear parameters in mirror filter to compensation performance of nonlinear distortions. Proceedings of Meeting on Acoustics, 2013; 19(1): 030025.
  • 5Knudsen M H, Grue Jensen J. Low-frequency loudspeaker models that include suspension creep. J. Audio Eng. Soc., 1993; 41(1): 3-17.
  • 6Thorborg K, Tinggaard C, Agerkvist F, Futtrup C. Fre- quency dependence of damping and compliance in loud- speaker suspensions. J. Audio Eng. Soc., 2010; 58(6): 472-486.
  • 7Thorborg K, Futtrup C. Frequency dependency of the loud- speaker suspensions (A follow up). J. Audio Eng. Soc., 2013; 61(10): 778-786.
  • 8Tobias Ritter, Finn Agerkvist. Modeling viscoelasticity of loudspeaker suspensions using retardation spectra. 129^th AES Convention, USA, 2010:8217.
  • 9Pritz T. Loss factor peak of viscoelastic materials: magni- tude to width relations. Journal of Sound and Vibration, 2001; 246(2): 265 -280.
  • 10Pritz T. Five-parameter fractional derivate model for poly- meric damping materials. Journal of Sound and Vibration, 2003; 265(4): 935-952.

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电声技术
2011年 第11期

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