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first mode     
相关语句
  第一模态
     the first mode frequency of the switch is 500Hz.
     测到第一模态频率是500Hz。
短句来源
     Both the first and second modes of the EOF analysis of the mixed layer depth anomaly indicate interannual variations. The main cycle for the first mode is about 3 years. For the second mode the main cycles are 1.8,2.4 and 4.3 years.
     混合层深度距平场EOF(Empirical Othorgnal Function)第一模和第二模时间变化的主信号均为周期的年际变化信号,其中第一模态约为3 a,第二模态则有1.8,2.4和4.3 a的3个显著周期。
短句来源
     In Summer, the first mode displayed negative at entire 100hPa Geopotential Height, and reflected the whole abnormal characters.
     而夏季第一模态全场为负值,体现了夏季100hPa整体异常性,与文献[5]中的结论一致;
     Furthermore, near Mc=1, the viscosity may accelerate the change of two dimensional most unstable waves from the first mode to the second mode at high wavenumber.
     在 Mc=1附近 ,从高波数段开始 ,粘性效应可强化二维不稳定扰动波由第一模态向第二模态的过渡
短句来源
     The simulation shows that the first mode frequency for performance is near 1000Hz, which is much lower than that of the second mode. The displacement of mirror is caused by the torsion of beam.
     模拟结果表明,该微动作器的第一模态频率远低于第二模态,镜子的位移由梁的扭转引起。
短句来源
更多       
  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
     2) the first mode is dominant at primary axis, which reduce intersectional coupling;
     2)在敏感方向上,一阶模态起主导作用,其它模态的影响较小,有利于减小交叉耦合的影响;
短句来源
     For a case study of a flexible cantilever beam, multiple metrics method is used to solve the nonlinear differential equations and derive the nonlinear modulation equations for the combination of the principal parametric and 1/2 subharmonic resonance of the first mode.
     运用多尺度法 ,研究了匀转速、顺臂安装下悬臂梁的一阶模态主参激共振与外激励 1/ 2次亚谐共振同时作用时梁的一阶近似稳态响应。
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
更多       
  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
  主要模态
     The orders of magnitude of the turbulent kinematic dissipation rate and density diffusivity are 10 -5w·m -3 and 10 -6 m2·s -1, respectively, with their first mode eigenvectors being characterized by increase with depth and corresponding time coefficients having a significant 6-hour period.
     湍动能耗散率和密度扩散系数的量级分别为 10 -5w·m-3 和 10 -6m2 ·s-1 ,受强潮流剪切影响该值明显高于陆架边缘海域 ,其空间主要模态表现为表层小、底层大 ,相应时间系数存在大约 6h的显著周期。
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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    The propagation experiment of explosive sounds in the isothermal layer below the thermoeline was made, the record of individual modes for frequencies 0.32-1.0 kHz was obtained. By analyzing the travel time of mode pulse, it was determined that the oscillographic recording was the first mode. On the basis of analyzing the propagation properties of the first mode, the bottom-reflection coefficients at small grazing angle for frequencies 0.32-1.0 kHz were obtained.

    在跃变层之下的等温层中进行了爆炸声传播实验,获得了频率0.32—1.0kH2的单个简正波的记录。通过对简正波脉冲传播时间的分析,确定所记录的波形为第一号简正波。根据第一号简正波的传播特性,分析得到了频率0.32—1.0千赫的小掠射角海底反射系数。

    The group velocity dispersion curves of Bayleigh waves through most of the Qing-hai-Xizang Plateau are obtained, using the single-station and multiple-filtering process. The observed period for the fundamental mode of Eayleigh waves ranging from 0.5 to 56.0 seconds. The standard deviations of the observed velocities are 0.08-0.15 km/sec. For the first mode, the periods are from 10 to 16 seconds, with the standard deviation of velocity determinations 0.05-0.13 km/sec. By means of generalized linear inversion...

    The group velocity dispersion curves of Bayleigh waves through most of the Qing-hai-Xizang Plateau are obtained, using the single-station and multiple-filtering process. The observed period for the fundamental mode of Eayleigh waves ranging from 0.5 to 56.0 seconds. The standard deviations of the observed velocities are 0.08-0.15 km/sec. For the first mode, the periods are from 10 to 16 seconds, with the standard deviation of velocity determinations 0.05-0.13 km/sec. By means of generalized linear inversion of the dispersion curves, we obtained a five-layer crust model with a low-velocity layer at a depth between 27 to 40 km. The transverse wave velocity for the low velocity zone is 3.29 km/sec, and lower by 0.21 km/sec than that in the zone above.

    本文用单台多重滤波方法测定了经过青藏高原地区瑞利波群速度频散曲线。所得基阶瑞利波的观测周期为5.0—56.0秒,速度标准偏差为0.08—0.15公里/秒,一阶瑞利波的观测周期范围为10—16秒,速度标准偏差为0.05—0.13公里/秒。利用广义线性反演方法对频散曲线进行反演,可得出一个由五层构成的地震横波速度地壳模型。在27—40公里之间存在低速层,其横波速度为3.29公里/秒,比上一层低0.21公里/秒。

    Torsional fatigue failures are the peculiar troubles in reciprocating engine drives. In recent years this kind of problems also occured in many marine diesel installations in our country. This paper gives a brief description to the problems on torsional fatigue failures as well as to the main reason of these problems, and this paper also intends to present some methods for eliminating the failures.As to torsional fatigue failures, the first mode of motion is most frequent. In general, shifting method should...

    Torsional fatigue failures are the peculiar troubles in reciprocating engine drives. In recent years this kind of problems also occured in many marine diesel installations in our country. This paper gives a brief description to the problems on torsional fatigue failures as well as to the main reason of these problems, and this paper also intends to present some methods for eliminating the failures.As to torsional fatigue failures, the first mode of motion is most frequent. In general, shifting method should be used to prevent this failure. Changes in the elasticity of the shaft line or in the inertia of diesel flywheel can be made so as to remove the running speed sufficiently apart from important critical speed of first mode. The Second mode is also occured frepuently, a damper is usually msed to avoid it. If both aft and forward ends of the engine were used to deliver power or the shaft line is of long-shaft arrangement, the torsional fatigue failures of the third mode will be occurring, and care must be taken to it. Moreover, this paper also gives abrief discussion on other forms of torsional casualties, such as transmission gear beat, damper failure, camshaft break, etc.At last, this paper expounds several key links to which attention should be paid during the design, experiment and trial voyage stages of marine installations.

    扭振疲劳事故是往复式发动机动力装置特有的故障。近年来,我国一些船舶柴油机动力装置曾多次发生扭振事故。本文对这些故障情况及其发生原因作了简要介绍,並结合实例对消除故障的方法进行了深入的讨论。在扭振疲劳事故中,以单节扭振故障最为常见。通常采用调频法消除,可改变轴系柔度或柴油机飞轮惯量以使单节主临界转速远离常用转速。双节扭振故障也较常见,通常可加装减振器以消除之。如柴油机前后端同时输出功率,或轴系较长时,有可能产生三节扭振故障,也必须予以注意。此外,本文对扭振故障的其它形式,如传动齿轮敲击、减振器损坏、凸轮轴断裂等进行了简要分析。最后,本文阐述了为使柴油机动力装置具有良好的扭振特性,在其设计、试验和实船试航各阶段必须注意的几个环节。

     
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