本文選題：壓電陶瓷揚(yáng)聲器 + 揚(yáng)聲器系統(tǒng)　； 參考：《南京大學(xué)》2015年碩士論文

【摘要】：壓電陶瓷揚(yáng)聲器的基本工作原理是,通過逆壓電效應(yīng)使壓電陶瓷片產(chǎn)生彎曲振動,向外輻射聲波,與傳統(tǒng)的電動式揚(yáng)聲器有很大區(qū)別。壓電陶瓷揚(yáng)聲器一般由五層以上的壓電層及金屬層構(gòu)成,由于其結(jié)構(gòu)及振動模式的復(fù)雜性,使得目前與壓電陶瓷揚(yáng)聲器相關(guān)的研究極為有限,更沒有一個(gè)成熟的模型來表征壓電陶瓷揚(yáng)聲器單元的振動。事實(shí)上,壓電陶瓷揚(yáng)聲器的主要問題是低頻拓展不夠,而使用時(shí)一般都包含前腔或后腔,作為一個(gè)揚(yáng)聲器系統(tǒng)工作,因此,研究壓電陶瓷揚(yáng)聲器系統(tǒng)的中低頻特性可以解決很多問題。本文通過激光測試壓電陶瓷揚(yáng)聲器的位移曲線來分析其振動模式,發(fā)現(xiàn)壓電陶瓷揚(yáng)聲器在中低頻仍然是以一種整體振動的運(yùn)動方式為主。以此為基礎(chǔ),討論了壓電陶瓷揚(yáng)聲器應(yīng)用腔體時(shí)的系統(tǒng)優(yōu)化設(shè)計(jì),分析了壓電陶瓷揚(yáng)聲器中前腔結(jié)構(gòu)和后腔結(jié)構(gòu)帶來的影響。通過實(shí)驗(yàn)設(shè)計(jì)與分析,發(fā)現(xiàn)：壓電陶瓷揚(yáng)聲器附加前腔時(shí),前腔開孔數(shù)量越多,Q值越大,且系統(tǒng)中高頻峰的位置越往后移；附加前腔容積越大,中頻補(bǔ)償越靠前,高頻下降越快；壓電陶瓷揚(yáng)聲器中附加后腔容積越大,則系統(tǒng)共振頻率越低。同時(shí),本文還引入了管道倒相式結(jié)構(gòu),通過理論分析和實(shí)驗(yàn)設(shè)計(jì)證明了管道倒相式結(jié)構(gòu)在壓電陶瓷揚(yáng)聲器中同樣適用,并在合理的設(shè)計(jì)后可以有效地提升壓電陶瓷揚(yáng)聲器系統(tǒng)的低頻聲壓級,拓寬壓電陶瓷揚(yáng)聲器系統(tǒng)的有效頻率范圍。
[Abstract]:The basic working principle of the piezoelectric ceramic loudspeaker is that the piezoelectric ceramic plate produces bending vibration and radiates acoustic waves through the inverse piezoelectric effect, which is very different from the traditional electric loudspeaker. Piezoelectric ceramic loudspeakers are generally composed of five or more layers of piezoelectric and metal layers. Due to the complexity of its structure and vibration mode, the current research on piezoelectric ceramic loudspeakers is very limited. There is also no mature model to characterize the vibration of piezoelectric speaker units. In fact, the main problem with piezoelectric ceramic loudspeakers is that the low frequency expansion is not enough, and when used, they usually contain front or rear cavities to work as a loudspeaker system, so, Many problems can be solved by studying the middle and low frequency characteristics of piezoelectric ceramic loudspeaker system. In this paper, the displacement curve of piezoelectric ceramic loudspeaker is measured by laser to analyze its vibration mode. It is found that the medium and low frequency of piezoelectric ceramic loudspeaker is still a movement mode of whole vibration. Based on this, the system optimization design of piezoelectric ceramic loudspeaker is discussed, and the influence of front cavity structure and rear cavity structure on piezoelectric ceramic loudspeaker is analyzed. Through experimental design and analysis, it is found that the larger the number of openings in the front cavity and the more the position of the high frequency peak in the system are, the larger the volume of the additional front cavity is, and the more the if compensation is forward, the larger the volume of the additional front cavity is, the greater the Q value of the front cavity is, and the higher the position of the high frequency peak is, The larger the volume of the additional rear cavity in the piezoelectric ceramic loudspeaker, the lower the resonance frequency of the system. At the same time, the inverted phase structure of pipeline is introduced in this paper. The theoretical analysis and experimental design prove that the inverted phase structure of pipeline is also suitable for the piezoelectric ceramic loudspeaker. After reasonable design, the low frequency sound pressure level of piezoelectric ceramic loudspeaker system can be raised effectively, and the effective frequency range of piezoelectric ceramic loudspeaker system can be widened.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN643

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