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对左、右段为圆柱型、中间段为变截面杆的三段式复合扭振超声变幅杆给出了频率方程和参数计算通式据此得出中间段l2分别为指数型、类国雄型、类悬镇线型和类余弦型,而l1=l3≠0,或l1≠0;或l3≠0的各种组合复合杆的参数计算式,并算出了其参数值,给出了主要参数曲线.测试了十组典型试件的谐振频率和放大系数,实验结果与理论值基本一致,本法可组合成许多适应各种用途的扭振复合杆 相似文献
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对左、右段为圆柱型、中间段为变截面杆的三段式复合扭振超声变幅杆给出了频率方程和参数计算通式据此得出中间段l2分别为指数型、类国雄型、类悬镇线型和类余弦型,而l1=l3≠0,或l1≠0;或l3≠0的各种组合复合杆的参数计算式,并算出了其参数值,给出了主要参数曲线.测试了十组典型试件的谐振频率和放大系数,实验结果与理论值基本一致,本法可组合成许多适应各种用途的扭振复合杆 相似文献
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本文从分析纵振和扭振杆件振动方程及其解出发,得到两相对应的纵、扭振杆在外形、性能及尺寸应用声学 相似文献
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介绍以小信号正弦电磁激振和脉冲设击激振,加速度计进行信号检测的扭振超声变幅杆谐振频率和角位移放大系数的测定方法。该法已应用于科研试验中。 相似文献
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本文对夹心式纵-扭复合振动模式压电超声换能器进行了研究.从换能器的等效电路出发,在无耦合时,得出了换能器中纵向振动模式及扭转振动模式的各自共振频率方程.实验表明,换能器各自共振频率的测试值与理论计算值基本符合. 相似文献
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本文对夹心式纵-扭复合振动模式压电超声换能进行了研究,从换能器的等效电路出发,在无耦合时,得出换热能器纵向振动模式及扭转振动模式的各自共振频率方程,实验表明,换能器各自共振频率的测试值与理论计算值基本符合。 相似文献
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Study on the Langevin piezoelectric ceramic ultrasonic transducer of longitudinal-flexural composite vibrational mode 总被引:1,自引:0,他引:1
Lin S 《Ultrasonics》2006,44(1):109-114
In this paper, the Langevin longitudinal-flexural composite mode piezoelectric ultrasonic transducer is studied. This type of transducers consists of slender metal rods and longitudinally polarized piezoelectric ceramic rings. The resonance frequency equations for the longitudinal and flexural vibrations in the transducer are derived. By correcting the length of the metal slender rods, the simultaneous resonance of the longitudinal and flexural vibrations in the transducer is acquired. The experimental results show that the measured resonance frequencies of the transducers are in good agreement with the computed ones, and the measured resonance frequencies of the longitudinal and the flexural vibrations in the composite transducers are also in good agreement with each other. 相似文献
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Lin Shuyu 《Ultrasonics》1994,32(6):461-465
The sandwiched piezoelectric ultrasonic torsional transducer was studied. The transducer consists of front and back metal cylinders, and coaxially segmented, tangentially polarized, piezoelectric ceramic tubes. The torsional vibration of the tangentially polarized piezoelectric ceramic slender tube was studied first and its electromechanical equivalent circuit was derived. Based on the network theory and the electromechanical equivalent circuit, the torsional vibration of the piezoelectric ceramic cylinder, formed by stacking a number of identical short piezoelectric ceramic rings, was analysed and the electromechanical equivalent circuit of the piezoelectric ceramic stack in torsional vibration was developed. Finally, the sandwiched ultrasonic torsional transducer was studied and resonance frequency equations were derived which can be used to design and calculate the torsional transducers for different applications. 相似文献
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The79Br quadrupole resonance in cadmium, strontium, barium, zinc, magnesium and nickel bromates is studied in the range 77 to 305
K. The temperature dependence of the resonance frequencies in these systems has been analysed on the basis of the torsional
motion of the BrO
3
−
groups. The torsional frequency and its temperature behaviour have been analysed. 相似文献
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卤化银微晶中光电子衰减谱的特性 总被引:2,自引:1,他引:1
光电子在卤化银材料潜影形成过程中发挥着重要的作用 ,光电子衰减行为在很大程度上决定于卤化银的晶体结构。采用光学与微波双共振技术 ,测量了自由光电子和浅俘获光电子的衰减谱 ,得到了卤化银中电子陷阱的密度和深度分布。以自由光电子寿命为纽带 ,通过分析掺杂卤化银晶体中电子陷阱的分布情况 ,可以确定浅电子陷阱掺杂剂的最佳掺杂浓度。 相似文献
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I. V. Bodnar 《Journal of Applied Spectroscopy》1998,65(3):466-468
Raman spectra in (┴, ┴) and (║, ║) polarizations are investigated on crystals of CuGaS2, AgGaS2 compounds and CuxAgl−xGaS2 solid solutions. The frequencies of longitudinal and transverse optical phonons are determined, their concentration dependences
are constructed, and the behavior of the vibrational modes in CuxAgl−xGaS2 solid solutions is established.
Belarusian State University of Information Science and Radioelectronics, 6P, Brovka St., 220069, Minsk, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 3, pp. 447–449, May–June. 1998. 相似文献
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With the emphasis on the effects of the density-dependent bag constant and the rotation of strange star the limiting mass of strange star is calculated. The obtained results show that the limiting mass and the corresponding radius of strange star increase as the rotation frequency increases, and tend to be lowered when the density-dependent bag constant is considered. 相似文献