动平衡

Sealing type upstream pumping principle are hydrodynamic pressure and hydrostatic pressure equilibrium.

上游式泵送密封的原理是动水压力和静水压力相平衡。

The simulation results of the cylinder-block model were given in the article, consistent with that of Middlemen"s. It was shown that the block part could improve the uniformity of the flow distribution. The analysis of the flow field of some materials with different power-law factor in the die designed by Mckelvey was close to that of Mckelvey"s. It was shown that the flow distribution was uniform in the die that can producesheets with 1200mm in width. During the analysis the flow channel was divided into several parts to get the details about the fluid flow in each area. A conclusion was drawn after analyzing the influence of the die pressure on the flow distribution, that the higher pressure is good for the output and bad for the uniformity of the distribution. Simulation of the die applying the cylindrical main runner showed the fact that when the cylinder replaced the cone the change of uniformity was trivial. The uniformity of the non-block flow channel was so poor that the block in the proper position of the die channel was necessary. The project of the die for the wider sheet was put forth, and the analysis of the fluid flow in the die was shown.

本文模拟了圆柱管缝隙流模型的三维流动场，得到了与Middlemen结论一致的流动均匀性，并通过模拟直观地展示了采用阻尼块可以改善挤出均匀性的现象；分析了多种幂率指数的流体在Mckelvey等人设计的流道模型中的流动分布，得到了与Mckelvey的分析结果接近的压力降和流量偏差；本文建立了1200mm幅宽机头流道的三维有限元模型，并逐个分析各个区域和多个截面的流动分布状况，由此揭示了1200mm幅宽L-型机头流道内的流北京化工大学硕士学位论文动分布基本均匀，并在分析了机头压力对于挤出流动分布的影响后得出结论：较高的机头压力可以获得较大的产量，但是不利于物料均匀分布；模拟了采用圆柱管主流道时机头流道内的流动分布，得出结论：主流道由圆锥管改为圆柱管时对流动均匀性影响不大，通过设置适当的阻尼仍然可以达到挤出平衡；模拟了两端进料式圆柱管无阻尼流道的流动均匀性后得到结论：两端进料式无阻尼结构的流动均匀性较差，宽机头中仍然有必要设置阻尼块；确定宽幅机头流道的基本方案，并设计了一种宽幅防水卷材挤出机头流道的结构，通过流动模拟表明该种结构的流动均匀性较好；考察了宽幅机头对于不同厚度片材的挤出适应性，得到结论：当生产不同厚度的片材时，阻尼块高度需要调整。

The equal rigidity design for the flexible joint of DTG is discussed in this poper,which derived the equations of calculating the axial and radial rigidity of two gimbal flexible joint inthis paper.

本文讨论了动力调谐陀螺仪挠性接头的等刚度设计，导出了双平衡环动调陀螺挠性接头轴向刚度和径向刚度的计算公式。

As a result of this use of oil-bearing fan and after dynamic and static balance correction, noise greatly reduced.

由于这种风机采用含油轴承并经过动、静平衡的校正，噪音大大降低。

All rats were anesthesized and ventilated mechanically with FiO2 0.5, BR 100·min-1, VT12ml·kg-1 and I/E 1/1.5. The blood was withdrawed to induce hemorrhagic shock via the carotid until blood pressure reached 45±5mmHg and lasted for 1 hour, and the shed blood and Ringers lactate in volume equal to the shed blood were reinfused for resuscitation in two hours in groups B～F . Afterwards, LPS was given via the trachea(200μg·kg-1,in 500μl normal saline) to establish the ARDS model.

所有动物均行机械通气，吸入氧浓度（FiO2 ）0.5，B～F动物在20min内自颈动脉放血至平均动脉压为45±5mmHg，休克1h后开始液体复苏，在2h内回输全部采集血液及等量平衡液，然后气管内给予内毒素200μg·kg-1。

This paper investigated the flow characteristics of the pump, deduced the equation of the instantaneous flow and the pulsation of the pump.

研究了平衡式复合齿轮泵的流量特性，给出了瞬态流量公式及流量脉动计算式。

The multi-gear pump ultimately solves some important problems such as unbalanced radial force and high flow pulsation of the common gear pump.

多齿轮泵部分地解决了普通齿轮泵径向力不平衡及流量脉动大等问题。

As to load model, it contains unbalance dynamic load, wheel flaw, abrasive load and rail gap exciting load.

在车辆的响应分析中，对于载荷模型可以分为：动不平衡载荷；轮缺陷及其擦伤载荷以及直轨道轨缝、接头处引起的激振载荷。

Based on the transfer matrix method and ball bearing analysis theory, the dynamic characteristics of rotor-bearing system of high speed machine tool spindle are researched.

完成5SD51A和5SD18-4等两款高速磨削电主轴的动态设计，分析了各种结构因素对主轴临界转速、不平衡响应和动、静刚度的影响。

Finally, the adaptive control strategy of active balancing for a strictly positive and real rotor with actuator time delay is successfully extended to a flexible rotor with single collocated plane and a flexible rotor with multiple collocated planes. A series of numerical simulations demonstrate that the proposed controller is valid to suppress the imbalance-induced vibration of these rotor systems.

最后，把带作动器时迟的严格正实转子系统的自适应控制策略成功地推广到具有单并置平面的柔性转子及具有多并置平面的柔性转子，一系列数值模拟验证了该控制律对抑制这些转子不平衡振动的有效性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。