振动

ObjectiveTo observe the effect of vibration massage apparatus on skin temperature by infrared thermal imaging system .Methods30 healthy students of Shanghai university of TCM accepted two operations of vibration massage apparatus-non-vibration and vibration . The temperature diversity was obseved at different time : before operation , after 3min operation, after evaluating apparatus 1, 2, 3,4,5 min by infrared thermal imaging system .

方法上海中医药大学的30名健康大学生先后接受机械振动按摩器的空置和振动两种操作，用红外热像仪分别于操作前0 s、操作3 min后即刻、撤离仪器后1 ，2，3，4 min和5 min观察受试者以心俞为中心的手掌大小区域的温度的动态变化，并用分析软件处理相关温度数值，将结果进行统计学分析。

Through laboratory tests on sandy pebble soil by using the dynamic triaxial tests,we studied the influence about dynamic modulus and damping ratio under the conditions of different vibration frequency and consolidation stress ration.

通过饱和砂卵石土室内动三轴试验，将不同振动频率对动模量和动阻尼比的影响进行了较为细致的研究，分析了饱和砂卵石土的动力特性随振动频率的变化规律。

Finally, stochastic vibration analysis of a two-floor frame structure by blasting seismic action is done by finite element program ANSYS. In order to contrast, that by nature seismic action is also done here, and displacement field, velocity field and stress field of this two kind of condition are obtained, and differences of the structure damage mechanics by two kind of action are analyzed. Dynamic reliability analysis of the two-floor frame structure is done using of simulation results, obtaining the safe reliability level of the structure by seismic action, and seismic safety evaluation of the frame is completed.

最后，运用有限元程序ANSYS对爆破地震动作用下一个两层框架结构进行了随机振动分析，为了进行对比，这里也对结构受天然地震动作用进行了随机振动分析，得到了两种地震动作用下结构响应的位移场、速度场和应力场的变化情况，分析了爆破地震动和天然地震动对建筑结构物破坏机理的不同；应用数值模拟的结果对该两层框架结构进行了动力可靠性分析，得到了其在地震动作用下的安全可靠度，完成对该框架的爆破地震安全性评估。

The running quality of the wind tunnel power shaft system has a decisive influence on the efficiency and performance. With increase of the runtime of the shafting, rotor parts have inevitable mass eccentricity, which obviously strengthens the coupling function of torsional and bending vibration.

风洞动力轴系的运行品质对风洞的效率和性能有决定性的影响，随着轴系在役运行时间的增加，转动部分多数会有质量偏心现象出现，这使得轴系的扭转振动与弯曲振动的耦合作用明显增强。

This thesis presents the studies of U-shape gantry structure of container gantry crane, and dynamic simulation and fatigue life estimation of its rigid anti-sway. The main contends are as follows: Supposed that trolley frame is composed of spring structure, due to larger trolley gauge of U-shape gantry structure. For the gantry crane, a series spring dynamic vibrating model with three masses, three freedoms of degrees is built in this thesis and vibrating calculus equations are precisely resolved by mode analyses rule.

本文研究集装箱门式起重机U型门架结构及其刚性减摇系统的动态仿真和疲劳寿命估算，主要内容如下：由于U型门架结构小车轨距较大，本文建立了考虑小车架为弹性结构时门式起重机的三质量三自由度串联弹性动力学振动模型，用模态分析法求解振动系统微分方程组的数值精确解。

For this project, in virtue of the experimental observations on the vertical vibrator,the invert torsion pendulum and the vertical pipe with capillary outlet,and by using numerical simulations of the discrete element method, the mixing and segregation of granular materials of spherical and neraly spherical shape with the different size and different density under the vertical vibration or parallel shear motion have been researched, and the relationship between the macroscopic segregation properties and the microscopic characteristics of granular materials and the outer actions has also explored. The theoretical model and method describing the mixing and segregation of granular materials is developed.

本项目通过在垂直振动台、倒扭摆、带毛细出口的竖直玻璃管等装置上进行实验观测，并采用以离散元方法为主的数值模拟，研究了具有不同粒子尺寸、密度的球形或近球形颗粒物质在具不同结构形状容器中垂直振动和剪切运动时的粒子混合和偏析情况，探索颗粒材料流的宏观偏析特性与微观特征量及外部作用间的关系，发展描述颗粒物质混合和偏析的理论模型和方法。

Because effect of upper bridge to longitudinal vibration of pier could not be neglected,fundamental frequency calculation formulas of pier restrained on its top by bridge beam were derived based on energy method.

针对实际工程中桥梁上部结构对桥墩顺桥方向振动具有不可忽略的约束作用，在能量法的基础上推导出了顶端受桥梁约束的桥墩复合振动基频计算公式。

On the cutting motivation conditions, air layer between two metal layers is flowed to-and-fro, which can absorb a part of motivation energy, so it leads to low noise radiation.

当金刚石工具在切割激励的条件下，基体之间的空气层在振动的作用下来回地流动，由于夹层中间的空气流动，吸收了一部分振动能量，从而导致较低的噪声辐射。

On the basis of analyzing the failure forms of the sucker rod, the existence of the torsional vibration of the sucker rod was approved and its reason was found out.

在综合分析抽油杆破坏形式的基础上，肯定了采油过程中抽油杆扭转振动的客观存在，分析了抽油杆产生扭转振动的原因。

Power and mechanical engineering ; steam turbine ; rotor-bearing ; nonlinear vibration ; oil whip ; Newmark method

动力机械工程；汽轮机；转子-轴承；非线性振动；油膜振动； Newmark法

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。