共查询到20条相似文献,搜索用时 93 毫秒
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本语文采用网络传输法分析了螺栓螺固型纵振换能器的设计方法,并考虑了换能器结构件的内部机械损耗和压电元件的电损耗,数值计算了换能器谐振特性及节面位置,结果与实验情况一致。 相似文献
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超声技术的基石——超声换能器的原理及设计 总被引:9,自引:0,他引:9
超声换能器是在超声频率范围内将交变的电信号转换成声信号或者将外界声场中的声信号转换为电信号的能量转换器件,它是超声技术中的关键器件,其性能好坏直接关系到超声应用技术的效果和使用范围.由于超声技术的应用范围很广,且超声新技术层出不穷,因而与此对应的超声换能器的种类也很多.文章对不同应用背景下多种类型超声换能器的原理及设计进行了阐述,分析了不同类型超声换能器的性能参数及设计要求,简要总结了超声换能器的性能参数测试方法,并对超声换能器的发展趋势进行了一定的分析. 相似文献
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本文采用网络传输法分析了螺栓紧固型纵振换能器的设计方法,并考虑了换能器结构件的内部机械损耗和压电元件的电损耗,数值计算了换能器谐振特性及书面位置,结果与实验情况一致。 相似文献
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北京正负电子对撞机二期(BEPCⅡ),国产500 MHz超导腔经过紧张的安装调试于2017年10月正式投入带束流运行。首先对此国产超导腔两次降温调试的相关参数进行了监测和对比分析;其次研究了通过高功率老练的方法改善超导腔的品质因数,并实时监测超导腔老练过程中的辐射剂量;最后对超导腔的带束流运行情况进行了介绍分析。结果表明:BEPCⅡ国产500 MHz超导腔虽然放置了6年,但是状态良好,通过高功率老练能够降低超导腔的辐射剂量,改善其性能,完全满足束流运行要求。 相似文献
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The flow of water mist in a narrow duct has been studied experimentally. The profile of the velocity of drops has been measured, and the viscosity of the mist has been calculated using the Navier–Stokes equation. It has been found that at low gradients of the rate of shear the viscosity of the mist can exceed that of clean air by tens and even hundreds of times. The electric charge of the drops has been measured. It has been found that the viscosity of the mist differs from that of clean air at gradients of the rate of shear that are less than the frequency of the establishment of electric equilibrium between the drops. A comparative analysis of the viscosities of the mist and a drop cluster has been carried out, and the dependence of the viscosity of the water aerosol on the radius and the charge of the drops has been predicted. The possible role of aerosols that contain submicron drops in the known “clear air turbulence” problem has been shown. 相似文献
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The magnetic structure of the compensated ferromagnet-multiferroic interface has been considered. The law governing the decrease of distortions of magnetic order parameters with increasing distance from the interface has been found. An expression for the energy of interlayer interaction of magnetic order parameters has been derived, and it has been shown that its magnitude is determined by the exchange interaction. The condition for magnetization switching of the ferromagnetic layer by an electric field applied to the multiferroic layer has been formulated. It has been demonstrated that the magnetoelectric effect and weak ferromagnetism are not prerequisites to the development of electric field-switchable magnetoresistive memory. 相似文献
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E. M. Baitinger E. A. Belenkov M. M. Brzhezinskaya V. A. Greshnyakov 《Physics of the Solid State》2012,54(8):1715-1722
The experimental results of a comprehensive investigation of the structure of detonation synthesis nanodiamonds by electron microscopy methods have been presented. The morphology of diamond nanoparticles has been investigated and the microdiffraction patterns have been analyzed. The method of characteristic fast electron energy loss spectroscopy in transmission electron microscopy has been used. The local density of structural components of a nanodiamond (diamond core and fullerene-like shell) has been obtained. The shape of the shell surrounding the nanocrystal has been determined using model calculations. A hypothesis explaining the charging of the nanodiamond surface has been proposed. 相似文献
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Evolution of optical pulses, which propagate in strained graphene, has been investigated. The effective wave equation for the vector potential of the electromagnetic field has been derived. The tensile strain of graphene layers has been described using the effective vector-potential in terms of the gauge theory. The numerical solution of the derived wave equation has been presented and the dependence of the pulse strength and shape on the magnitude of the external strain has been analyzed. 相似文献