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The effect of electric load on the piezoelectric vibrational system due to electroacoustic coupling isanalytically investigated.The analytical results show that:(1)when load impedance continuallychanges from ∞to+∞,the mechanical resonant frequency of the system would fill all frequencydomain from 0 to ∞;(2)the displacement and stress distributions also would change,even the dis-placement may be zero at both free ends(i.e.at points where stress is equal to zero). Finally,the experiments for longitudinal vibration of piezoelectric strip of lateral polarizationare given and compared with theoretical results. 相似文献
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The effect of electric load on the characteristics of piezoelectric vibration systems was presentedin our recent papers.The resonance frequency of such systems can be changed continuously withthe electric load.In accordance with this effect,the piezoelectric-tunable transducers have been built. In this paper,the principle of the piezoelectric-tunable transducers is demonstrated while thepiezoelectric-tuning of the sandwich piezoelectric transducers are analysed theoretically and a sandwichtransducer of a longitudinal vibrating bar with field parallel to the length is investigated experimen-tally.The theoretical and experimental results show that such piezoelectric-tuning is effective inthree-halves octaves.This piezoelectric-tuning is convenient for the piezoelectric-tunable transducers,and can be carried out continuously and instantaneously. 相似文献
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可调频率压电换能器原理 总被引:3,自引:0,他引:3
最近,我们曾研究电负载对压电振动系统振动特性的影响。随着电负载的连续变化,通过压电效应,压电振动系统的谐振频率也连续地改变。由此引伸,可以实现可调频率压电换能器,本文将对其原理进行研讨。我们将对压电夹心换能器进行这种调节频率的理论分析,并对一种纵向加电场,纵向振动的夹心换能器进行实验比较。理论与实验结果一致表明,用有效耦合系数K_eff来衡量,该换能器可以在一个半倍频程的范围内有效地工作。这里提出的可调频率压电换能器,由于是改变电负载,通过压电耦合来实现换能器的频率调节的,因此它还具有方便、连续和瞬时可调的特点。 相似文献
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本文进一步详细分析了平行场激励下压电板厚度振动,给出其诸振频率方程的新形式及耦合模的机电耦合系数,研究了耦合模及纯模的调频特性,并将结果用于两个实例中。 相似文献
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本文进一步完善了垂直场激励下压电板的谐振频率方程,并详细分析了耦合模的压电调频关系。进而提出了适用于垂直场或平行场激励下压电板的统一谐振频率方程。最后从物理上讨论了压电棒条与压电板振动的一致性及垂直场或平行场激励的本质上的内部联系。 相似文献
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在文献[1]中,我们给出了一些简单而重要的单模压电振动系统在电负载下的振动特性,给出了谐振频率、位移和应力分布随电负载的变化。我们现在来讨论另一类重要而复杂一些的多模耦合的压电振动系统——压电晶体板在电端具有电负载时的厚度振动问题。结果将表明,Tiersten分析过的压电板厚度振动的著名结果将是我们在电开路和短路条件下的特例。 相似文献
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