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first mode
相关语句
  一阶模态
    The vibration attenuation mechanism was expounded. The influence of different damping layer shear modulus and magnetic stiffness on the loss factor of beam for the first mode by MCLD treatment was evaluated.
    分析了不同阻尼层设置方式下 ,磁约束阻尼处理对系统一阶模态损耗因子的影响 ,阐明了磁约束的减振机理 ,分析了阻尼层剪切模量和磁刚度对磁约束处理减振效果的影响 .
短句来源
    3) the three support structure of the shaft system made coupling between the first mode of the exciter rotor and the second mode of the generator rotor.
    3)轴系三支点的结构使得励磁机一阶模态与发电机二阶模态耦合
短句来源
    On the other hand, the nonlinear geometric terms produce a hardening effect and dominate the planar response of the first mode.
    而梁的非线性几何项具有硬特性效应 ,主宰了系统的一阶模态响应 .
短句来源
  第一模式
    Cooling the wall stabilizes the first mode, destabilizes the second mode
    壁面冷却对第一模式起稳定作用,对第二模式起不稳定作用
短句来源
    The result in this paper about the first mode of stability and the numerical transition prediction about plate fit the result of experiments very well.
    本文给出的平板边界层第一模式的稳定性分析和转捩区数值预报结果,与已有的实验结果一致。
短句来源
    It gives also a stability analysis on the first mode of the boundary layer of flat plane and a forecasting of transition point. Results are discussed and compared with observations.
    给出了平板边界层第一模式的稳定性分析和转捩区数值预报结果,与已有的实验结果进行了比较。
短句来源
  “first mode”译为未确定词的双语例句
    Then the variation of the first mode is adopted as the damage signature, the sensitivity and the independent of normalization are certificated, and the advantage of which is listed.
    选取结构的一阶振型变化率作为结构的损伤诊断标识量,验证推导了一阶振型变化率对结构损伤诊断的敏感性以及归一化的无关性,分析了一阶振型变化率相对于其余的损伤诊断标识量的优越性。
短句来源
    Ice induced displacement responses of offshore fixed platforms are investigated in both time domain and frequency domain. The relationships of ice induced displacement responses with ice characteristics,ice directions and structural types of platforms are analyzed and determined. And an important conclusion is obtained for the first time that ice breaking frequency and the natural frequency of the first mode of the platform are the two main factors which dominate the amplitude of vibration.
    从时域和频域两个方面考察了海洋石油固定平台的冰激位移响应,分析了冰的特性、冰力方向和平台结构型式三者与冰激位移响应的关系,得到冰的破碎频率和平台固有频率是决定结构振动程度的两个主要因素这一重要结论,为平台抗冰和结构设计提供了有力的计算依据。
短句来源
    The method of multiple scales combined with the Cartesian transformation is used solve to the nonlinear differential equations and derive a set of nonlinear modulation equations for the principal parametric resonance of the first mode and 3:1 internal resonance between the first two modes. Then, the modulation equations are numerically solved to obtain the steady-state response and the stability assessment of the beam.
    采用多尺度法并结合笛卡尔坐标变换 ,导出了系统受前两阶模态间 3∶ 1内共振及第二阶模态主参激共振时的非线性调制方程组 ,数值求解了该方程组的定常解及相应的稳定性问题。
短句来源
    Since the subharmonic resonance curve of the first mode and the combination resonance curve extend as far as the region of the second mode resonance, there are some parameter regions in which several motions may occur corresponding to the same frequency of the pulsating flow.
    第一振型次谐波共振曲线能覆盖整个组合共振区域 ,而且能延伸到第二振型次谐波共振区域。 因此 ,此系统存在同一个脉动频率与多种运动相对应的参数区域
短句来源
    The natural frequency,quality factor,first mode of fold beam and Young's modulus of the double linear vibratory gyroscope were measured by the new setup.
    并用此方法测量了双线性振动陀螺的固有频率、品质因子、—阶模态振型和杨氏模量。
短句来源
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  first mode
It has been shown that the middle regime is unstable, only the first mode of the small disturbances being unstable over a broad range of the parameters.
      
In the first mode, which is realized at rather substantial differences between the initial temperature of the reservoir and the temperature of water being injected, the condensation of steam occurs at the interface.
      
In the first mode, input processes are digitized after a START signal; in the second mode, a signal exceeding a preset threshold is uninterruptedly sought for and recorded.
      
These velocity deviations have been determined for the first mode of Love waves and for the zero mode of SH waves as functions of the thickness and acoustic properties of the coating and substrate.
      
It is shown that the frequency band of the received signal can be broadened by introducing a frequency-time correction of the propagation time of the first mode as a function of the sound frequency.
      
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A mathematical model is established by means of the finite element transfer matrix method in order to calculate the dynamic response of a multispan, multi bearing 300MW turbo genarator set′s rotor system. The transient response of the gencrator exciter rotor and the bearing seal system is calculated. The dynamic characteristic of the seal ring and its effect on rotor vibration are analyzed and computed. A site of tests indicated three main reasons for over limit vibration in the positions near the bearing:...

A mathematical model is established by means of the finite element transfer matrix method in order to calculate the dynamic response of a multispan, multi bearing 300MW turbo genarator set′s rotor system. The transient response of the gencrator exciter rotor and the bearing seal system is calculated. The dynamic characteristic of the seal ring and its effect on rotor vibration are analyzed and computed. A site of tests indicated three main reasons for over limit vibration in the positions near the bearing: 1) closeness of the critical specd of the rotor system of the exciter rotor with the operating speed; 2) the effect from the dynamic characteristics of the seal ring; 3) the three support structure of the shaft system made coupling between the first mode of the exciter rotor and the second mode of the generator rotor.

用多跨多轴承转子系统动力响应有限元—传递矩阵法建模,计算了发电机—励磁机转子及轴承密封环系统的瞬态动力响应。对密封环的动力特性及其对转子振动的影响进行了分析和计算。通过现场实测,证实某引进型300MW发电机轴承处振动超差的主要原因是三个:1)励磁机轴系临界转速过于靠近工作转速;2)密封环动力响应的影响;3)轴系三支点的结构使得励磁机一阶模态与发电机二阶模态耦合

The major dispute between Mack's and Wazzan's results of the linear instability for flat plate boundary layer lies in the effect of free stream Mach number on the viscous instability. In the paper, taking influence of the air thermodynamic properties into account a temporal eigenvalue problem of an adiabatic flat plate is calculated by a collocation technique. The numerical results indicate that the viscosity is only stablizing for the first mode and the second viscous mode is always stable at M=3....

The major dispute between Mack's and Wazzan's results of the linear instability for flat plate boundary layer lies in the effect of free stream Mach number on the viscous instability. In the paper, taking influence of the air thermodynamic properties into account a temporal eigenvalue problem of an adiabatic flat plate is calculated by a collocation technique. The numerical results indicate that the viscosity is only stablizing for the first mode and the second viscous mode is always stable at M=3. It is consistent with Mack's conclusion.

Mack和Wazzan关于可压缩平板边界层线性稳定性结论的主要分歧在于来流马赫数对粘性稳定性的影响.本文充分考虑了空气热力学参数的影响,并用配置点方法计算了绝热平板时间模式特征值问题.数值结果表明粘性对第一模式只起稳定作用,M=3粘性第二模式总是稳定的,结论和Mack一致

There exist variety of instability in three dimensional boundary layer on swept wing, the cross-flow instability is dominant The flow over rotating cone is typical three dimensional boundary layer It has been shown that the experimental and theoretical results of rotating cone can be used to model cross flow instability of swept wing At high speeds, where even the basic flow calculations of swept wing are a problem, owe to it′s simple geometry, rotating cone become a suitable and valuable model to study...

There exist variety of instability in three dimensional boundary layer on swept wing, the cross-flow instability is dominant The flow over rotating cone is typical three dimensional boundary layer It has been shown that the experimental and theoretical results of rotating cone can be used to model cross flow instability of swept wing At high speeds, where even the basic flow calculations of swept wing are a problem, owe to it′s simple geometry, rotating cone become a suitable and valuable model to study cross flow instability of high speed three dimensional boundary layer on swept wing In this paper, a rotating sharp cone which located in a supersonic/hypersonic free stream at zero attack is used as a model to study the cross flow instability of high speed three dimensional boundary layer The purpose of present work is to investigate the different instability mechanism of two and three dimensional boundary layers and effect of wall cooling on the instability The basic boundary layer flow is calculated using box scheme and the instability eigenvalue problem is solved by a fourth-order accurate two-point finite difference scheme Since the calssical approximation method of thermodynamic parameters of the air has not enough accuracy for numerical analysis of high speed instability problem, a high degree polynomial is used to imitate the dependence on temperature of viscosity, conductivity, Prandtl number and specific heat from experimental data The numerical results show that the growth rates of cross-flow first mode are larger comparing with those in two-dimensional case and the influence of cross flow decreases as Mach number increases but the influence of cross-flow on the second mode is weakly The results also show that the instability with cross flow cover a much wider range of unstable frequencies than those without cross flow and the growth rates of travelling waves are larger than stationary waves, the most unstable stationary wave is approximately perpendicular to potential flow direction If M e<4 3 the most unstable disturbance is the first mode, if M e>4 3 it is the second mode In three dimensional boundary layer the most unstable second mode is oblique, in two dimensional boundary layer is two-dimensiona; Cooling the wall stabilizes the first mode, destabilizes the second mode

用两点四阶差分格式研究旋转圆锥超音速三维边界层的横流不稳定性和壁面冷却对稳定性的影响数值结果表明,与二维边界层相比横流使三维边界层第一模式增长率增大,对第二模式影响很小;Me<43第一模式最不稳定,Me>43第二模式最不稳定;三维边界层最不稳定第二模式是三维波,二维边界层则为二维波;壁面冷却对第一模式起稳定作用,对第二模式起不稳定作用

 
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