Time-frequency distribution series based on wavelet transform is discussed., and a new time-frequency tool: frequency-shear distribution is introduced into radar imaging fields.
讨论了基于小波变换的时频分布级数，把一种新的时频分析工具——频率-切变分布应用于时频成像。
The shear spring bears most of the vertical loading, which decreases the vibration frequency.
剪切弹簧承担大部分垂直方向的载荷，降低震动频率。
Shear wave velocity data measured by these two methods appeared to be good consistency and no obvious frequency dispersion was found from a few hertzs to tens of kilohertzs.
两种方法所测得的剪切波速数据具有很好的一致性，且在数赫兹至数十千赫兹频段范围内剪切波速不具明显弥散性。
Objective To study the effect of enhanced external counterpulsation (EECP) on frequency components of shear stress in myocardial ischemia condition.
目的研究体外反搏治疗心肌缺血时血管对剪切应力各频率分量的影响。
The frequency responses of the system combing probe tip and piezo chip were detected, the difference between the shear force detection and the tapping mode detection was discussed.
文中给出了探针-压电片检测系统的的频率特性，并比较了剪切力探测和轻敲模式探测特性的区别。
The composite viscosity at the condition of dynamic shear test is consistent with shear viscosity at steady shear test at the low shear rate or low frequency.
在低频率(或低剪切速率)下，动态剪切测量的复合粘度与稳态剪切测量的剪切粘度是相等的。
The vibration frequency of box gird is usually calculated by the elementary beam theory, but it will lead to a large error because of the existence of shear lag effect and shear deformation.
由于剪力滞效应及剪切变形的存在，箱梁的弯曲振动频率按照初等梁理论计算往往存在较大的误差。
The well-known phase speed formulas of surface inertial gravity wave and internal shear inertial gravity wave are the special cases of this frequency equation.
表面惯性重力波和惯性重力内波的相速公式都是这个更普遍的频率方程的特殊情况。
A low frequency ultrasonic (Lamb like) wave method is used for characterizing the shear, longitudinal wave velocities, the thickness, and the density of ultra thin two layered bonding composite.
提出用低频超声类兰姆波定征方法来估计超薄双层胶结复合结构各层的纵波声速、横波声速、厚度和密度等参数。
A low frequency multi mode ultrasonic Lamb wave method suitable for characterizing shear and longitudinal wave velocities, thickness and density of ultra thin elastic layers is presented.
提出了用低频多模式超声兰姆波定征方法来估计超薄弹性层的纵波声速、横波声速、厚度和密度等参数。
Through compaction hardness and analog shear rock failure test to drilling core, the paper discusses the possibility of discriminating downhole rock type by using rock acoustic emission frequency.
通过对钻井取心岩样压入硬度及模拟剪切的破岩试验，探寻利用岩石的声发射频率来判别井下岩石类型的可能性。
Fast shear wave is obviously different from slow shear wave in amplitude and frequency characteristics.
同时快横渡与慢横波在振幅和频率特征上也具有明显差异。
As the shear rate rises, the amplitude of pressure oscillation reduces, whereas the slide velocity, critical slide length and the frequency increase.
随剪切速率的增加，压力振荡的振幅减小，而滑移速率、临界外推滑移长度及振荡频率均有提高。
In this paper, the effect of shear deformation and rotatory inertia on the free vibration of a beam is studied. Thus a simple and accurate formula for the calculation of frequency is presented.
本文研究剪切变形与转动惯量对梁自由振动的影响，提出了简便、准确的频率计算公式。
Moreover, this paper analyses the shear strain and compressive stress and loading frequency dependence of the damping ratio.
另外，对叠层橡胶支座的阻尼比随剪应变、压应力及荷载频率的变化情况进行了分析。
S-wave inverse quality factor is related to the shear-modulus versus frequency dispersion, which can be used to develop method for estimation of S-wave attenuation.
横波品质因子的倒数与剪切模量一频散有关，由此可以建立横波衰减的估算方法。
The attenuation factor of longitudinal wave was changing linearly, whereas the attenuation factor of the slow shear wave kept nearly constant with a low frequency on the exploration seismic band.
纵波的衰减系数在地震频带内基本上呈线性变化，而横波的衰减系数在地震频带内除低频外基本保持稳定。
Temporal evolution of the low frequency electrostatic perturbations in an unmagnetized plasma with strong shear flow is investigated.
研究了在具有剪切本底流的非磁化等离子体中离子声波的激发及其与涡旋的转化。
A low frequency ultrasonic Lamb like wave method suitable for characterizing the thickness, density, shear and longitudinal wave velocities of the ultra thin bonding composite is presented.
提出用低频超声类兰姆波定征方法来估计超薄黏结复合结构各层与黏结层的厚度、密度、纵波声速和横波声速等参数。
The results reveal that the high value areas of the kinetic energy of low-frequency fluctuations in the upper level are closely related with the zonal asymmetry and the meridional shear of westerlies.
发现高空低频扰动动能的高值区与西风急流的纬向非对称性和经向切变关系密切。
The analysis method in frequency domain is adopted to treat the transversely isotropic multi-layered soils, and response of soil layers under the upward shear waves is obtained.
采用频域分析方法，对多层横观各向同性土层对垂直向上的入射剪切波的反应进行了分析。
The shear strength increases with increasing frequency in the same dynamic amplitude.
在相同动应力幅值条件下，频率越高，强度越高；
This paper establishes the general recurrence steps of using difference method for the frequency equation and mode shapes of discrete multi-mass shear structures.
以船舶辅机的梁式隔振结构为对象，运用模态分析方法和自适应算法，推导并分析了梁式结构振动主动控制的基本原理和方法。
This paper establishes the general recurrence steps of using difference method for the frequency equation and mode shapes of discrete multi-mass shear structures.
以船舶辅机的梁式隔振结构为对象，运用模态分析方法和自适应算法，推导并分析了梁式结构振动主动控制的基本原理和方法。
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