脉动

In mathematics, it can be boiled down to two equivalent forms of a kind of classical solutions to the general Navier-Stokes Equation of velocity fluctuations.

从数学而言，这一框架的理论基础可归结为描述不可压缩脉动场的Navier-Stokes方程的两个等价形式。

Growler, lost at sea in February, 1944. Black at that depth turn, golden boy no more white bone to bone, turn hear who bore you weep hear him who made you deep there on ocean's floor turn as waters stir; turn, bone of man Cold as a planet is cold, beat of blood no more the salt sea's course along the bone jaw white stir, boy, stir motion without motion stir, and hear love come down. Down as you fell sidewise, stair to green stair without breath, down the tumble of ocean to find you, bone cold and new among the ships and men and fish askew.

在那深处漆黑一片翻转，不再是金童子白骨连白骨，翻转听听生你的人为你哭泣是他造就了你，你仔细听在大洋深深的底部随着海水的搅动翻转；翻转，男子汉的骨头如行星般寒冷寒冷，血不再脉动盐海的航向沿着白色颌骨搅动，小伙子，搅动没有动作的姿态搅动，并聆听爱降下来向下，当你倒向一侧，梯级到绿梯级没有呼吸，随着大洋的翻滚找到你，骨头寒冷而新鲜，在歪歪斜斜的船只丶人丶鱼之间。

In the paper, a numerical model is proposed for natural pulsating flow and heat transfer.

本文发展了一种模拟自激脉动流动及对流传热过程的数值方法。

Then, the relationship between the heat transfer characteristics and the flow patterns was investigated.

在此基础上，深入研究脉动热管的换热特性及其与流型的关系。

A position in the Yangtze Delta links each heart bit of the market for Heavy Tube Enterprise

一个长三角区位，联结了每点重管企业的市场脉动。

The acoustical radiation power is expressed as a Hermitian quadratic form, while the radiation modes is determined by general eigenvalue decomposing, and then the radiation efficiency is computed via the orthodoxy of radiation modes with regards to impedance matrix and average velocity matrix; lastly, the validity of the method is proved by pulsating sphere and radiating cube with analytical results.

先将结构的声辐射功率表示为一个正定的厄米特二次型，运用广义特徵值分解求解了复杂结构的声辐射模态，然后利用声辐射模态关于阻抗矩阵与均方速度祸合矩阵的正交性，求解了复杂结构的声辐射效率，最后用具有解析解的脉动球与辐射立方体验证了该方法的有效性。

According to the studied results at present, the studied objects are mainly thin plate and beam about sound radiation mode, a method computed sound radiation mode of complex structure is presented in this dissertation, according to the results of the previous two chapter, a theoretical method to solve acoustical radiation mode and acoustical radiation efficiency of complex structure by boundary element method and acoustical radiation theory is posed, the acoustical radiation power is expressed as a Hermitian quadratic form, while the radiation modes is determined by general eigenvalue decomposing, and then the radiation efficiency is computed via the orthodoxy of radiation modes with regard to impedance matrix and average velocity matrix; lastly, the validity of the method is proved by pulsating sphere and radiating cube with analytical results. According to results of the form three chapter, the structure sound radiation sensitivity is studied in detail, the sound radiation power of structure can be expressed as positive Hermitian quadratic form, the sound radiation sensitivity can be expressed as two parts by partial differential with respect to design variable, which are sensitivity of boundary velocity and impedance matrix, combined with the theory of FEM and BEM, the structure sound radiation can be translated to the analysis of structure dynamic sensitivity and impedance matrix sensitivity. The theory posted in this dissertation is tested by the FEM software ANSYS and the software AAS programmed by author.

在前几章的基础上，通过结构声辐射的模态理论对结构的声辐射的机理进行了深入地探讨，针对目前声辐射模态的研究对象主要是简单的板和梁类结构，提出了一种计算复杂结构声辐射模态的方法，利用前两章研究所得的结论，将边界元方法与广义特征值的理论结合起来研究了复杂结构的声辐射模态与声辐射效率，先将结构的声辐射功率表示为一个正定的厄米特二(来源：ABb7C论文0909网www.abclunwen.com)次型，运用广义特征值分解求解了复杂结构的声辐射模态，然后利用声辐射模态关于阻抗矩阵与均方速度耦合矩阵的正交性，求解了复杂结构的声辐射效率，最后用具有解析解的脉动球与辐射立方体验证了该方法的有效性。

Continuously variable transmission ; hypocycloid ; planet gear ; crank slide block mechanism ; pulse

无级变速器；内摆线；行星齿轮；曲柄滑块机构；脉动

When the heat flux is just beyond that activates the boiling incipience, the oscillation time period is in the range of 50 to 100 seconds.

当热流密度略大于沸腾起始点时，脉动周期长达50~100s。

There are several problems in the conventional direct torque controlsystem such as large torque-ripple,inconstant inverter switching frequency.

摘 要：传统的直接转矩控制存在转矩脉动大、开关频率不恒定等问题。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。