振动

Obtaining the displacement of vibration, the velocity and acceleration are directly computed by differentiation matrices. The period of nonlinear vibration is computed by barycentric Lagrange interpolation collocation method.

计算得到振动位移后，采用微分矩阵和重心Lagrange插值计算非线性振动的速度、加速度和振动周期。

After mixing benzonitrile with anhydrous ethanol, we have also measured their vibrational dephasing time.

并对苯甲腈与无水乙醇混合后的这三个振动模式的振动退相时间进行了测量，并得到了变化后的振动退相时间。

It is avoidless that machines vibrate. Acute vibrating is the primary reason of destroying machines. So detecting vibrating signal may be used to find out machines working condition. At the same time the signal can be analyzed and blooey signal can be found out.

机器的振动是难免的，过大的振动又往往是机器破坏的主要原因，因此，我们通常利用检测设备检测振动信号来监视机械的工作状态，并对信号进行分析处理提取故障信号。

Methods electromagnetic shaker was used to create reproducible 250 hz vibration on the guinea pig bulla. the hearing function was monitored by compound action potential measurement. five animals were evaluated from 3 hours to 4 days after vibration stimulation for the blood labyrinth barrier change with 4.7 t experimental magnetic resonance imaging.

用电磁振荡器在5只豚鼠听泡上产生可重复的振动，其振动频率为250 hz，用复合动作电位评估其听功能，振动后3小时至4天用4.7特斯拉磁共振成像分析其血迷路屏障变化。

Moreover, combined with the instance of building, the finite element method for calculating building vibration from subway and its influencing factor is analyzed.

进一步结合实例分析了地铁振动影响下建筑物振动的有限元计算方法及建筑内振动传播的基本规律。

And combined with field test of the chain belt vibration, the generation condition of the chain belt vibration and crawling was explored.

结合对铸型机链带振动的现场测试，探讨铸型机链带振动和爬行产生的条件，为铸型机振动和爬行的控制提供依据。

Because any reports on the active control of rotating disk haven't be seen in China up to now, and this experiment research is important, so the complete set of active control system of rotating disk are built independently. The push-pull type electromagnet is applied to control the vibration of the circular disk. The power amplifier circuit that can respond to wide scope in frequency from DC to AC is designed by improving the existing circuit. The sensor signal is first low-pass filtered, then the proportional control plus the differential control circuit easy used in practice are applied to finish the more effective control. The electromagnetism shield is used as possible to decrease the signal disturbance from the electromagnet to eddy sensor.

考虑到目前国内尚未见到有关旋转圆盘振动主动控制的相关报导以及实验的重要性，自行设计制作了一整套旋转圆盘振动主动控制系统：提出并采用推拉型电磁作动器来控制圆盘的振动；在改进现有电路的基础上，自行设计了具有较理想特性的驱动电磁作动器的功率放大器；根据实际控制环境的特点，设计了先进行低通滤波，再采用比例和实用的近似微分电路构成的控制器，并采用了电磁屏蔽来减小电磁铁对传感器的干扰，以实现更有效的控制。

The low-dimensional Galerkin method is generalized to solve the flow around arbi-trarily translating circular cylinder.Active control problems of wakes behind circularcylinders are numerically investigated by only small number of modes.The in-line andtransverse oscillation of a circular cylinder with proper frequency produce Karman vor-tex street successfully in some subcritical regime,vhereas the transverse oscillation of acircular cylinder with 1.8 times the natural shedding frequency can effectively suppressthe Karman vortex street at a slightly supercritical Re.

将低维Galerkin方法推广至可以求解任意平移运动圆柱的绕流问题，用较少的模数值研究了圆柱尾迹的主动控制问题，在亚临界Re数下圆柱以适当的频率沿流向和横向振动均成功地激发出Karman涡街；而在略高于临界Re数下圆柱以1.8倍自然脱涡频率沿横向振动明显地抑制了Karman涡街；再现了超临界Re数横向及流向振动圆柱绕流的频率锁定等复杂非线性现象。

The influences of the circumambience soil on the vibration of dynamic equipment foundation are simulated, which reveal that the circumambience soil has a remarkable effect on the foundation vibration and almost has no effect on the vibration of isolation platform.

模拟了动力设备基础周围土体对振动的影响，计算结果表明，动力设备基础周围土体对基础的振动影响较大，但对隔振台座的振动几乎没有影响。

A time-frequency analysis method based on HOS is proposed to study the girder gust response, and the supreme mode contributed to gust response and the modal coupling could be identified using this method.

二、提出利用基于高阶谱的时频分析研究大桥非平稳、非线性风致振动响应，能够得出对不同测点风致振动响应贡献最大的模态和耦合振动模态。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。