振

The shaker mount is first moved a small distance toward the arch ends to ensure that the arch possesses two stable equilibrium positions, one on each side of the base line. The spring connecting the arch end and the mechanical shaker is carefully chosen such that small shaker stroke can induce large vibration amplitude of the arch.

此外，我们在激振器与拱形梁之间外加一个弹簧做连接，这可使激振器在仅能达到有限的激振振幅下，仍能使拱形梁端点有足够大的振幅产生，并使之能够发生折断式挫曲现象。

The SCC has the following advantages: remarkably reducing the noisy pollution and the worker s labor intensity in construction, deducing the rough surface or segregation because of missing-vibration or excessive-vibration in conventional construction, resolving the quality-defect problems resulting from lacking-vibration in the section of complex shapes and densely-packed reinforcement area. At the same time, large of industrial solid waste such as fly ash and blast furnace slag is utilized in the proportioning of SCC. It is helpful in comprehensive utilization of resource and environment protection, so the SCC belongs to "green concrete", it is a branch of HPC which will be developed in the future.

这种混凝土可以显著降低混凝土施工中的噪音污染；大幅度减轻工人的劳动强度；减少传统混凝土施工中因漏振或过振造成的麻面或离析；解决了配筋密集、结构复杂部位因振捣不足而造成的质量缺陷问题；同时，由于自密实混凝土在配制中，大量利用粉煤灰、高炉矿渣等工业固体废弃物，有利于资源的综合利用和生态环境的保护；从而被誉为&绿色混凝土&，是未来混凝土向高性能发展的方向之一。

The vibration response of the viaduct structure by steel spring bearing, the viaduct structure by laminated rubber bearing, the track structure by Colon egg vibration damper, the track structure by steel spring damper and the ballast bed track structure are simulated through vehicle passed. The vibration parameter of the viaduct is optimized and the vibration transfer function characteristic of the ballast bed track structure and the track structure by steel spring damper are compared.

对钢弹簧支座高架桥结构、普通板式橡胶支座高架桥结构、克隆蛋减振器式轨道结构、钢弹簧浮置板减振器式轨道结构和普通碎石道床轨道结构在列车运行作用下的振动响应进行了仿真研究分析，对高架桥结构隔振参数进行了优化，比较了浮置板式和普通碎石道床轨道结构的振动传递特性。

An experimental rig was used to analyze the oil film flow state of the journal and bearing block excitation. Oil film flow state in the course of changing eccentricity, excitation method, excitation force and frequency were studied.

5通过改造的轴承实验台，完成了轴颈同期涡动和轴承座振动对滑动轴承油膜流态影响的实验，对偏心率、激振方式、激振力和激振频率变化过程中的油膜流态进行观察和测试。

Combining with National Natural Science Foundation of China -"Research on theory and technique of magnetorheological intelligent boring bar with self-chatter-suppression" NO.

本论文结合国家自然科学基金项目&基于磁流变液自抑振的智能镗杆构件理论与方法研究&(No.50405036)，开展了基于磁流变自抑振智能镗杆的颤振控制技术研究。

In order to study the relation-ship and the inter-action effect between driveline modals and full car modals, a part of full car modals which have no relationship with driveline was separated from the VPT model, and a simplified model which contains the modals of driveline and share part modals of full car coupling with driveline was established to help to study the coupling relationship between driveline and full car.

为了从整体上定量评价传动系统扭振剧烈程度，在相同档位时整个发动机变化的转速范围内，定义传动系统扭振均方根值均值作为指标来评价传动系统扭振剧烈程度。

By the use of a weighting method the ash formation distribution of coal with a wide sieve fraction can be obtained.

通常情况下，可以通过机械振筛的方法得到煤灰的粒径分布，清华大学采用 85 0℃的温度下将约 2kg的某窄筛分煤样在马福炉内静态燃烧，然后将收集的灰样在振筛机中用 2 。0mm振幅冷态振筛 5 0min的方法来研究了几种煤种的成灰特性，得到煤灰的初始粒径分布

On basis of variable rigidity principle,by combination of the advantages of rubber and metal vibration isolator,a composite structure isolator with special shape elastic element and damping amplitude limiter is designed.

根据变刚度原理，吸收橡胶隔振器高阻尼和金属弹簧隔振器高承载力的优点，采用新型材料，设计了一种由特形弹性元件以及弹性阻尼限幅装置组合而成的复合结构隔振器。

This balata lies between shake mat is phyletic and various, norms is all ready, facilitate cut into parts cut, assemble agile, can fight effectively press damping, apply to punching machine, forging press, fan, water pump, dynamo, air conditioning to wait for those who shake big Electromechanical equipment damping to use.

该橡胶隔振垫类别众多，标准完备，方便裁切，组装灵便，可有用抗压减振，适用在冲床、锻压机、风机、水泵、发电机、空调等撼动大的机械电子配置减振之用。

Although they used the 3D modes of the deck in the determination of aerodynamic characters so that the mechanical coupling and aero-coupling between the modes can be depicted more correctly ; in order to reduce the computation effort, however, they still adopted the partial differential equation to characterize the buffeting motion of the deck modeled as a uniform beam.

尽管他们将桥面的三维振型应用于计算气动特性分析中，从而可以较真实地描述振型间的机械和气动耦合。但是为了减小计算规模，他们仍然是用均匀梁的偏微分方程来描述桥面的抖振运动。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷