查询词典 oscillation

In our life, especially in mechanics and engineering sciences, there are many nonsmooth phenomena. For example, the noise of a squeaking spoon in a bowl, or the chattering of machines, the grating of brakes, the percussion of drilling machines, the switches of auto-controller, the oscillation of crystal, etc.

在我们生活中，特别是在力学和工程技术领域，经常会遇到非光滑现象：比如勺子在碗里刮擦时发出刺耳的噪声，或者机器的振动、刹车的摩擦、打孔机的冲击、自动控制器的转换以及晶体的振荡等等。

The of vortex-induced oscillation with square pomes in web is smaller than round ones an...

翼板上开孔能提高吊杆顺桥向来流的驰振临界风速，甚至杜绝该方向驰振的发生，且开孔越大效果越好。

The influence of potassium chromate on the electrochemical oscillation behavior of copper anode in H3PO4 solutions was investigated by using cyclic voltammetry and potentiodynamic scanning.

运用循环伏安法和恒电位法研究铬酸钾及其浓度对铜磷酸溶液的电化学振荡行为的影响。

By the improved algorithm of exploring iterative interpolation method, the pre-estimate formula in the form of 2-order differential equation have been replaced by pre-estimate formula in the form of 1-order differential equation, confirm the u monotony accession strictly. It could avoid the interpolation direction converse and oscillation.

算法采用改进的探索迭代法实现，用一阶差分预估器代替二阶差分预估位置点的偏差器，保证曲线参数u的严格单调增加，以消除插补方向反转和振荡现象。

The results showed that the pressure oscillation in the evaporator had something to do with vapor flowing out of capillary wick. During the experiment, vapor didn't appear in the back of capillary wick. The heat transfer process in the evaporator was analyzed.

对蒸发器的流动和传热现象进行了可视化实验，结果表明，蒸发器内的压力波动与肋顶面处产生的蒸汽逸出状况密切相关；在实验过程中，在毛细芯的背面始终未出现蒸汽。

A novel quasi-constant frequency hysteresis PWM control approach is presented in this paper. Frequency feedback is introduced in hysteresis current control to stabilize switching frequency. Comparing with the common used constant frequency current mode control, the new approach has better stability, faster transient and higher precision, as well as elimination of sub-harmonic oscillation.

摘 要：本文提出了一种新的准固定频率滞环PWM电流控制方法，该方法在滞环电流控制的基础上，引入频率反馈控制，使开关频率基本固定，解决了目前广泛使用的固定频率电流控制方法具有的次谐波振荡的问题，并且具有稳定性好、相应速度快、控制精度高的优点。

The Quasi-Normal oscillation shows the character of background space-time changing with time.

我们研究了无质量标量场在随时间变化的Schwarzschild黑洞背景下的扰动行为。

An explicit analytical solution of the threshold pump power of the laser has been derived based on rate equations which contain the attenuation coefficients of the pump and laser radiations as well as the major contribution of the re-emission of the upper level atoms to the pump wave by using the analytical solutions. An analytical solution of the minimum fiber length required for the onset of the oscillation is presented. In addition, the analytical solutions describing the variations of the density of the pump radiation and upper laser level population along the fiber length have also been given.

从速率方程组出发，在不忽略光纤损耗系数和保留再发射项主导部分的近似条件下推导出了双包层光纤激光器阈值泵浦功率的显函数解析表达式，得到了光纤激光器产生振荡所需的最小光纤长度的显函数解析解；还给出了泵浦光子数密度和上能级粒子数密度沿光纤方向随光纤长度变化的显函数解析解。

The influence of outlet port clearance is explored. The change of receiving tube length mainly results in the variation of the highest oscillation-availability ratio of pressure and tube response.

多管式射流振荡气波制冷机相比双管式更具有工业应用价值，故本文对正反馈式多管射流振荡气波制冷机进行了数值模拟分析。

Abrasive belt grinding ; flatness ; contact wheel ; contact plate/amplitude of oscillation

砂带磨削；平面度；接触轮；接触板/窜动量

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。