振幅减小

The relations of mw、mf between vibration parameters and cutting parameters are obtain by multivariant orthogonal polynomial regression tests.

实验和方程表明：随着振动频率和振幅的增加，摩擦系数减小；随着进给速度的增加，摩擦系数增大。

This method can make sure the structure radiant sound status in total noise and the detail phonate part quickly and correctly.(3) Study on the control mechanism of structure noise radiated from rotary machines, we build a common model of rotary machine structure noise analysis relied on the general characters of rotary machines. Based on this model, we analyzed various influence factors to structure radiant noise using the union of revolution and numerical calculation method. We found that the joint stiffness between the rotor and the frame is the most sensitive parameter of structure radiant noise by calculating and analyzing.

根据本文对于旋转机械结构噪声控制技术的研究结果和惯性振动筛工作的特殊要求，对有关参数的选择进行了讨论，并通过试验为降低惯性振动筛噪声找到了两个新的方法：即，在轴间相对运动要求不高的情况下，可以在激振器与筛体之间安装一组减振器，通过适当选取减振器参数，既可以使机体在工作频率附近获得稳定振幅，保证振动筛正常工作，又可以使机体的高频响应减小，降噪效果显著；反之，如果轴间相对运动精度要求(来源：1aABC论文网www.abclunwen.com)较高，可以采用空心滚动体轴承，在保证滚动体强度的条件下也可以获得较好的降噪效果。

The effect of anisotropy vary with the azimuth of fracture, especially a couple of level waves which have different schismatical degrees because of the difference of azimuth and velocity difference.

研究表明：①裂隙密度增大，各向异性效应增强，三类波的速度减小，衰减系数增大，特别是P波的衰减系数十分敏感，因此，可以利用振幅、速度等特征确定裂隙发育带。

Effect of tool rake angle on cutting vibration by experiments are done at different cutting speed in machining operation, and corresponding theoretical analysis is conducted.

对机械加工中刀具前角对切削加工振动的影响进行了系统的实验研究和相应的理论分析，结果表明：随着刀具前角增加切削加工振动的振幅逐渐减小。

Based on qualitative analysis and comparison of several options for suppressing transverse vibration on deck type steel plate girder of railway bridge,conclusions are made as follows:with static reinforcing,the vibration amplitude can be suppressed to some extent,but quasi-resonance of the bridge can not be avoided,moreover,the construction is inconvenient and costly.

通过对目前抑制铁路上承式钢板梁桥横向振动的几种方案进行定性的分析和比较，认为：静力加固方案可以使桥梁振幅有所减小，但不能避免准共振现象的发生，而且工程造价较高，施工也不方便；两桥连接方案减振效果明显(减振率近50%)，比较经济也比较方便，但同样不能避免准共振现象的发生；动力减振方案可以有效的抑制桥梁的准共振现象(现场试验中减振率达51.83%)，而且工程造价较低，施工简单、方便。

The result indicated that frequency of fish-shaped cable truss support system would decrease, resulting in increase of temperature.

算例表明，预应力鱼腹式索桁架支承体系固有频率随着温度的升高而减小，具有较强的非线性，其自振频率随着振幅发生变化，其非线性振动呈现&硬弹簧&特性，非线性自振频率高于线性振动频率。

Optimization of grain composition in the system of packing particle;2. The relationship among the amplitude, the friction coefficient, grain composition and the porosity of block in different height is analyzed.

将散体简化为粒径不同的两种颗粒模型，利用颗粒离散元法模拟了砌块成型过程，分析了振幅、摩擦系数以及颗粒级配与砌块不同高度处孔隙度的关系，验证了双向振压成型方式可以明显减小砌块的孔隙度。

From this formula we can explain the tendency that the hydrovibration frequency increased with decreasing wicket gate opening of Francis turbines.

此式可以解释水力振动频率随混流式水轮机导叶开度减小而增高的趋势，并用两个压力梯度方程初步阐述了压力脉动振幅随工况而变化的现象。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。