發(fā)布時(shí)間：2021-02-03 15:05

　　當(dāng)受到特定頻率的外部刺激時(shí),亥姆霍茲諧振器表現(xiàn)出強(qiáng)烈的諧振響應(yīng)。利用這一特性,通過調(diào)節(jié)亥姆霍茲諧振器的幾何參數(shù),可實(shí)現(xiàn)對(duì)亥姆霍茲諧振器單元的宏觀調(diào)控,有效減弱流經(jīng)亥姆霍茲諧振器的聲場。本研究的第一部分主要研究了幾何結(jié)構(gòu)參數(shù)對(duì)亥姆霍茲諧振器諧振頻率的影響。通過調(diào)節(jié)諧振器中活塞的幾何參數(shù)及位置,可改變亥姆霍茲諧振器的容量。進(jìn)一步探究了通過在諧振器開口處采用不同的附接板對(duì)諧振器諧振頻率的影響。為了驗(yàn)證幾何參數(shù)的影響,通過對(duì)亥姆霍茲諧振器內(nèi)部的壓力波動(dòng)進(jìn)行頻譜分析,表征了不同幾何參數(shù)下亥姆霍茲諧振器的諧振頻率和對(duì)應(yīng)諧振態(tài)的頻率峰值,本研究的第二部分主要探究了另一種幾何結(jié)構(gòu)條件下亥姆霍茲諧振器的聲衰減效應(yīng)。調(diào)整幾何結(jié)構(gòu),將亥姆霍茲諧振器連接在管道的一側(cè),此時(shí),管道內(nèi)部的聲波將產(chǎn)生衰減。為了探究聲衰減效應(yīng)的影響因素,首先,通過改變諧振器的幾何形狀和體積,研究了幾何參數(shù)對(duì)諧振頻譜響應(yīng)的影響。然后,通過分析系統(tǒng)中關(guān)鍵位置的壓力波動(dòng)頻譜,研究整體振蕩的實(shí)部阻尼在實(shí)驗(yàn)系統(tǒng)中的變化情況。本研究的最后一部分內(nèi)容是構(gòu)建復(fù)合的亥姆霍茲諧振器結(jié)構(gòu)單元。個(gè)體亥姆霍茲諧振器具有獨(dú)特的頻率響應(yīng)特性和吸聲能力,因此可將不同... 

【文章來源】：哈爾濱工業(yè)大學(xué)黑龍江省 211工程院校 985工程院校

【文章頁數(shù)】：93 頁

【學(xué)位級(jí)別】：碩士

【文章目錄】：
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
結(jié)論
References
Acknowledgement
Appendix



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