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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Loss mechanisms in piezoelectrics: how to measure different lossesseparately
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Loss mechanisms in piezoelectrics: how to measure different lossesseparately

机译：压电的损耗机制：如何分别测量不同的损耗

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Losses in piezoelectrics are considered in general to have threendifferent mechanisms: dielectric, mechanical, and piezoelectric losses.nThis paper deals with the phenomenology of losses first, then how tonmeasure these losses separately in experiments. We found that heatngeneration at off-resonance is caused mainly by dielectric loss tannΔ' (i.e., P-E hysteresis loss), not by mechanical loss, and that ansignificant decrease in mechanical Qm with an increase ofnvibration level was observed in resonant piezoelectric ceramic devices,nwhich is due to an increase in the extensive dielectric loss, not in thenextensive mechanical loss. We propose the usage of the antiresonancenmode rather than the conventional resonance mode, particularly for highnpower applications because the mechanical quality factor QBnat an antiresonance frequency is larger than QA at anresonance frequency
机译：压电损耗一般被认为具有三种不同的机制：介电损耗，机械损耗和压电损耗。n本文首先讨论损耗的现象学，然后在实验中如何分别测量这些损耗。我们发现共振时的发热主要是由介电损耗tannΔ'（即PE磁滞损耗）引起的，而不是由机械损耗引起的，并且在共振压电陶瓷器件中观察到机械Qm随振动水平的增加而显着降低，这是由于这是由于大量介电损耗的增加，而不是由于广泛的机械损耗的增加。我们建议使用反共振模式而不是常规共振模式，尤其是在大功率应用中，因为机械品质因数QBnat在共振频率下反共振频率大于QA

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