查询词典 ovalization

The numerical analysis method is used to study the ground movement laws caused by the ovalization variation in the cross section in the action of water and soil pressure of tunnel lining.Based on the stochastic medium theory,this paper suggests the method for calculating this ground movement caused by tunnel ovalization deformation.

采用数值分析方法研究了隧道衬砌在土水压力的作用下，断面所产生的椭圆化变形引起的地层位移规律，并基于随机介质理论，给出了计算隧道椭圆化变形引起地层位移的方法。

However, from the ovalization-curvature curve, the ovalization of the tube cross-section increases in a ratcheting manner with the number of cycles.

从弯矩－曲度的实验曲线中显示，在对称曲度循环弯曲负载时316L不锈钢管有循环硬化的现象，而经过了一些循环圈数后回圈会变的较稳定。

The accumulation of the ovalization for the first case is much faster for the deeper depth than that for the less shallow depth. However, the change of the width does not influence on the ovalization-curvature curve for the second case.

当在固定凹槽宽度且不同深度的情况下，凹槽越深，成长的速度累积椭圆化量较快，而在固定凹槽深度且不同宽度的情况下，不同宽度对椭圆化的变化并没有太大的影响。

Four years later, in a 1996 workover, well E-1 was successfully pressure tested above the deep casing collapse location, even though ovalization and tight spots existed above the collapsed casing.

4年后，在1996年修井，以及的E - 1是上述压力测试成功的深层套管崩溃的位置，即使ovalization和严密点以上倒塌套管存在。

The effects of some parameters, such as mandrel ball numbers, mandrel extension length, bending angle, lubrication condition of pressure die, relative bending radius and material, on ovalization have been investigated by experimental method, and the effective methods to reduce the ovalization are proposed.

文章采用实验法，研究了芯头个数、芯棒伸出量、弯曲角度、压块润滑状态、相对弯曲半径、材料等因素对截面畸变的影响；并提出了减小截面畸变的有效措施。

As for the ovalization-curvature curve, it can be observed that the ovalization increases in a ratcheting manner with the number of the bending cycle. When the magnitude of the ovalization reaches a critical value, the tube buckles.

至於在椭圆化－曲度的曲线图中显示，椭圆化会随著循环弯曲的圈数渐增且呈现对称棘齿的变化，当椭圆化值增加到某一极限时，薄壁圆管便会发生皱曲破坏。

For the ovalization-curvature curve, the ovalization exhibits the unsymmetric-increasing ratcheting manner with the number of cycles. It is shown that the width does not affect the aforementioned curve, however, the deeper the sharp-notch, the larger amount of the ovalization to bend the tube to a certain magnitude of curvature.

至於椭圆化-曲度的曲线图中显示，椭圆化会随著循环圈数呈现非对称棘齿状的增加，而凹槽宽度对上述曲线没有太大的影响，但尖锐凹槽的深度越深，弯曲至某固定曲度时所产生的椭圆化量就越大。

A new mathematical model is put forward numerically to simulate the wheel ovalization.. In the numerical simulation, the dynamic model of a half railway vehicle coupled with a tangent track is employed. Using the new numerical method investigates vehicle-track coupling system dynamic responses including lateral and vertical displacement of wheelsets and the vehicle, lateral and vertical vibration acceleration of the track at different phase angle of the two side wheels of the same wheelset, which are compared with that of the traditional model. The numerical results show that the discipline and frequency of dynamic responses are accordant, amplitude and phase of lateral dynamic responses are different. It is concluded the traditional track geometric irregularity excitation model does not simulate the effect of periodic wheels ovalization on vehicle-track coupling system dynamic behavior truly, the new model is more accurate and reasonable.

本文研究了车轮二阶周期性非圆化—椭圆化，建立了一个新的模拟车轮椭圆化的数学模型，结合车辆－轨道空间耦合动力学模型，计算了同一轮对左右车轮不同相位和车轮椭圆度下轮对和车体的横、垂向位移，钢轨横、垂向振动加速度，并与传统模型计算结果作了对比，分析表明两种模型的动力响应变化规律和频率一致，但横向动力响应幅值和相位均存在不同程度不可忽略的差异，因此传统的轨道几何不平顺激励模型不能真实模拟车轮的周期性椭圆化对车辆－轨道耦合动态行为的影响，而本文模型更能反映实际椭圆车轮与钢轨接触情形，计算方法准确而合理。

The results show that increasing the ball numbers and mandrel extension length may reduce the ovalization, but leads to more remarkable wall thinning; the ovalization becomes more severe with the larger bending angle; the smaller the relative bending radius, the larger the ovalization is; the ovalization and wall thinning degrees are both smaller in the case of pressure die with dry lubricant; and under the same bending condition, the ovalization of LF2M tube is larger than the one of 1Cr18Ni9Ti tube.

结果表明，增加芯头个数与芯棒伸长量都能减小弯管的截面畸变，但两者都导致弯管壁厚减薄量增大；随着弯曲角度的增加，截面畸变越严重，相对弯曲半径越小，无芯棒与芯头支撑段弯管的截面畸变愈严重；在压块无润滑情况下，弯管的截面畸变和壁厚减薄量都小，并且在同等弯曲条件下，1Cr18Ni9Ti弯管的截面畸变小于LF2M弯管。

The calculating results are compared with the test data in available literatures and FEM results. The research results show that the plastic hinge model is precise and correct, which can satisfy with the actual engineering demands. The collapse pressure of perforated liner casing decreases with phrase angle, initial ovalization and diameter-thickness ratio increasing, and increases with the yield stress. The phrase angle and initial ovalization have greatly influence on the collapse pressure. The collapse pressure of perforated liner casing is slightly changed with the diameter and density of perforation when the diameter and density are smaller than 12mm and 120 shots per meter, respectively.

计算结果表明：筛管抗挤强度的塑性铰模型具有很高的计算精度和准确度，可以满足工程实际需要；筛管抗挤强度随着射孔相位角、径厚比和初始椭圆度的增加而降低，随着屈服强度的增加而增加，相位角和椭圆度对筛管抗挤强度影响比较显著；在射孔直径小于12 mm、射孔密度小于120 孔/ m 时，筛管抗挤强度随射孔直径和射孔密度增加变化不明显。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。