基于亥姆霍兹谐振器超表面的吸声性能研究
发布时间：2021-02-03 15:05
当受到特定频率的外部刺激时,亥姆霍兹谐振器表现出强烈的谐振响应。利用这一特性,通过调节亥姆霍兹谐振器的几何参数,可实现对亥姆霍兹谐振器单元的宏观调控,有效减弱流经亥姆霍兹谐振器的声场。本研究的第一部分主要研究了几何结构参数对亥姆霍兹谐振器谐振频率的影响。通过调节谐振器中活塞的几何参数及位置,可改变亥姆霍兹谐振器的容量。进一步探究了通过在谐振器开口处采用不同的附接板对谐振器谐振频率的影响。为了验证几何参数的影响,通过对亥姆霍兹谐振器内部的压力波动进行频谱分析,表征了不同几何参数下亥姆霍兹谐振器的谐振频率和对应谐振态的频率峰值,本研究的第二部分主要探究了另一种几何结构条件下亥姆霍兹谐振器的声衰减效应。调整几何结构,将亥姆霍兹谐振器连接在管道的一侧,此时,管道内部的声波将产生衰减。为了探究声衰减效应的影响因素,首先,通过改变谐振器的几何形状和体积,研究了几何参数对谐振频谱响应的影响。然后,通过分析系统中关键位置的压力波动频谱,研究整体振荡的实部阻尼在实验系统中的变化情况。本研究的最后一部分内容是构建复合的亥姆霍兹谐振器结构单元。个体亥姆霍兹谐振器具有独特的频率响应特性和吸声能力,因此可将不同...
【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校
【文章页数】：93 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Chapter 1 Introduction
1.1 Background, objective and significance of the subject
1.2 The helmholtz resonators
1.3 Research background
1.4 Brief summary
Chapter 2: Theoretical Study And Simulating Helmholtz Resonator Using Comsol Analysis
2.1 Helmholtz resonator classic model
2.2 Linear impedance
2.3 Mathematical model for resonant frequency of helmholtz resonator
2.4 Influence of cavity geometry
2.5 Influence of neck geometry
2.6 Getting start with comsol
2.7 Simulation with fix dimensions
2.8 Surface simulation with multi helmholtz resonator
2.9 Brief summary
Chapter 3 Experimental Design For Helmholtz Resonator
3.1 Apparatus
3.2 Overview of experimental system
3.3 Main test section
3.3.1 Helmholtz resonator
3.3.2 Cavity duct
3.3.3 Plate
3.4 Acquisition and procession of pressure data
3.5 Pressure response characteristics by using matlab
3.5.1 Summary of a range of geometric parameters
3.5.2 Method of presenting data
3.6 Resonance of cavity duct
3.7 Effect of geometrical parameters of resonance on resonator response
3.8 Combination of helmholtz resonator
3.9 Brief summary
Chapter 4 Back Ground Level Of Resonance
4.1 Development of resonator frequency
4.2 Effect of the mouth area of helmholtz resonator
4.3 Effect of the volume of helmholtz resonator
4.4 Discussion of sound reduction
4.4.1 Experimental results of sound reduction
4.4.2 Experimental and simulation for metasurface
Conclusion
结论
References
Acknowledgement
Appendix
本文编号：3016713
【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校
【文章页数】：93 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Chapter 1 Introduction
1.1 Background, objective and significance of the subject
1.2 The helmholtz resonators
1.3 Research background
1.4 Brief summary
Chapter 2: Theoretical Study And Simulating Helmholtz Resonator Using Comsol Analysis
2.1 Helmholtz resonator classic model
2.2 Linear impedance
2.3 Mathematical model for resonant frequency of helmholtz resonator
2.4 Influence of cavity geometry
2.5 Influence of neck geometry
2.6 Getting start with comsol
2.7 Simulation with fix dimensions
2.8 Surface simulation with multi helmholtz resonator
2.9 Brief summary
Chapter 3 Experimental Design For Helmholtz Resonator
3.1 Apparatus
3.2 Overview of experimental system
3.3 Main test section
3.3.1 Helmholtz resonator
3.3.2 Cavity duct
3.3.3 Plate
3.4 Acquisition and procession of pressure data
3.5 Pressure response characteristics by using matlab
3.5.1 Summary of a range of geometric parameters
3.5.2 Method of presenting data
3.6 Resonance of cavity duct
3.7 Effect of geometrical parameters of resonance on resonator response
3.8 Combination of helmholtz resonator
3.9 Brief summary
Chapter 4 Back Ground Level Of Resonance
4.1 Development of resonator frequency
4.2 Effect of the mouth area of helmholtz resonator
4.3 Effect of the volume of helmholtz resonator
4.4 Discussion of sound reduction
4.4.1 Experimental results of sound reduction
4.4.2 Experimental and simulation for metasurface
Conclusion
结论
References
Acknowledgement
Appendix
本文编号：3016713
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