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This paper,by means of the unified model of vehicle-track systems,performs a simulating calculation of the railway track and vehicle,caused by track stiffness change.On the basis of simulation calculation,this paper tries to analyze the influence of track stiffness change on axle box acceleration with wavelet and power spectrum density.

据此运用车辆-轨道垂向系统统一模型对不同轨道刚度情况下引起的车辆和轨道响应进行了仿真计算，并对计算结果进行小波分析和功率谱处理，主要分析了钢轨、轨下垫层、道床刚度的变化对客车轴箱加速度的影响，同时对用客车轴箱加速度的变化反推道床的刚度状态进行了探索。

Railway track ; sleeper ; ballast ; axle box acceleration ; wavelet analysis

轨道；垫层；道床；轴箱加速度；小波

It is shown from the results that the acting force and vibrating acceleration are increased due to its axle load, however, the dynamics interaction between 25 t load wagon and the turnout can be improved by the rubber stack in its axle box, especially in the index such as derailment coefficient, reduction rate of wheel load, opening size of tongue rail and point rail, which is almost equal to the dynamics of 21 t axle load wagon.

结果表明尽管轮轨力和振动加速度因轴重增加而相应增大，但由于25t轴重货车在轴箱处采用橡胶堆，使它与道岔之间的动态相互作用有所改善，尤其是脱轨系数、减载率、尖轨和心轨前端开口量等指标上，与21t轴重货车引起的系统振动值基本一致。

A back electromotive force observer is constructed to acquire the information of speed as well as acceleration. By selecting the time constant or observer gain properly, the current command reduction characteristics can be adjusted freely in some range.

其中的反电动势观测器能方便地获得速度和加速度信息，通过适当调整观测器的时间常数和增益，就能使驱动电流指令值在一定范围内自由调解以达到控制目的。

This kind of not balanced centrifugal action of force will cause the vibration on the bearing, this kind of vibration can have the noise and the acceleration bearing wears, thus influence work piece grinding quality and serious influence grinder's service life.

这种不平衡离心力作用在轴承上会引起振动，这种振动会产生噪声和加速轴承磨损，从而影响工件的磨削质量和严重影响磨床的使用寿命。

At the same time the velocity, acceleration and period of vibrating can be calculated by differentiation matrix and barycentric Lagrange interpolation, respectively.

同时，利用微分矩阵和重心Lagrange插值可以方便地求出非线性振动的速度、加速度和振动周期。

Not only the displacement but also velocity and acceleration have higher accurate in barycentric Lagrange interpolation collocation method.

重心Lagrange插值配点法不但对位移具有极高的计算精度，而且对于速度和加速度也就有极高的计算精度。

Obtaining the displacement of vibration, the velocity and acceleration are directly computed by differentiation matrices. The period of nonlinear vibration is computed by barycentric Lagrange interpolation collocation method.

计算得到振动位移后，采用微分矩阵和重心Lagrange插值计算非线性振动的速度、加速度和振动周期。

It then explains how the existing code can be improved from native C++ code to using MMX acceleration.

接着演示了使用MMX加速算法来提高C++代码的性能。

The movement characteristic analysis of elbow-bar framework is dealt with to gain displacement, velocity and acceleration of moving bedplate by adopting polar coordinates vector method.

具体内容和创新归纳如下：1 采用极坐标矢量法对肘杆机构进行了运动特性分析，得到活动平台的位移、速度和加速度等参数。

Now he worked in ajoint venture.

现在他在一家合资企业工作。

More troops in Afghanistan won't change any of the foregoing.

更多的在阿富汗的军队也不会改变之前的状况。