| 封闭式扬声器系统空气劲度的非线性研究 |
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| 引用本文： | 黄杰,沈勇,王坤,章志亮.封闭式扬声器系统空气劲度的非线性研究[J].应用声学,2015,34(6):471-476. |
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| 作者姓名： | 黄杰 沈勇 王坤 章志亮 |
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| 作者单位： | 南京大学声学研究所 近代声学教育部重点实验室,南京大学声学研究所 近代声学教育部重点实验室,南京大学声学研究所 近代声学教育部重点实验室,南京大学声学研究所 近代声学教育部重点实验室 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 从理想气体多变过程的状态方程出发,推导了封闭式扬声器系统的非线性空气劲度的理论公式。研究发现,封闭式扬声器系统的非线性空气劲度与音圈运动位移、有效辐射面积、箱体有效容积和多变系数等主要因素有关。通过实验,分别测量了封闭式扬声器系统与扬声器单元的非线性劲度,二者相减获得封闭式扬声器系统的非线性空气劲度。实测数据与理论计算得到很好的吻合。
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| 关 键 词： | 空气劲度 非线性 多变过程 |
| 收稿时间： | 5/5/2015 12:00:00 AM |
| 修稿时间： | 2015/8/13 0:00:00 |
Analysis of nonlinear air stiffness of closed-box loudspeaker system |
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| Huang jie,Shen yong,Wang kun and Zhang zhiliang.Analysis of nonlinear air stiffness of closed-box loudspeaker system[J].Applied Acoustics,2015,34(6):471-476. |
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| Authors: | Huang jie Shen yong Wang kun and Zhang zhiliang |
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| Institution: | Key Laboratory of Modern Acoustics, MOE, and Institute of Acoustics, Nanjing University,Key Laboratory of Modern Acoustics, MOE, and Institute of Acoustics, Nanjing University,Key Laboratory of Modern Acoustics, MOE, and Institute of Acoustics, Nanjing University,Key Laboratory of Modern Acoustics, MOE, and Institute of Acoustics, Nanjing University |
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| Abstract: | The theoretical formula of the nonlinear air stiffness of closed-box loudspeaker system was derived based on the state equation of polytropic process of an ideal gas. It was found that the air stiffness of closed-box loudspeaker system was related to the displacement of the voice coil, the effective radiation area of the driver, the effective volume of the box and the polytropic exponent of the system. The nonlinear stiffness of the closed-box system and the driver were measured separately and the air stiffness was obtained accordingly. The measured air stiffness agreed well with the theoretical calculation. |
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| Keywords: | Air stiffness Nonlinearity Polytropic process |
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