薄板的

According to the ratio of kinematic energy to internal energy and the ratio of hourglass energy to internal energy,a criterion of virtual punch velocity selection wasproposed.

根据系统动能与内能的比值、沙漏能与内能的比值，提出了薄板成形动态仿真研究力学建模中虚拟凸模速度的选取准则。

From the lamella shown in Fig.2-1,we take out a small and positive parallelepiped PABC,and take for an unit length in the directional dimension in z.

从图2-1所示的薄板取出一个微小的正平行六面体PABC(图2-3)，它在z方向的尺寸取为一个单位长度。

Then, using the second-order central difference to discretize the time derivative of the displacement, and applying the quadrature formula to the mass matrix, a fully discrete lumped mass Morley element method i...

然后利用中心差分格式离散时间方向的二阶导数，再利用适当的求积公式得到薄板弯曲问题的集中质量Morley元全离散格式。

During welding thin plates with less arc current,the arc stableness is an important factor to affect the welding quality.

在薄板小电流电弧焊的过程中，影响焊接质量的一个重要因素就是电弧的稳定性。

According to structural characteristics of floating slab tracks, a track segment element was taken between two adjacent fasteners. For each element, rails were regarded as Euler beams supported by discrete viscoelastic supports. The fasteners and rubber supports were replaced by a linear spring and damp. So the vibration model of the floating slab track was established. In constructing vibration model of a metro train, each car of the metro train with two suspensions was modeled as a multi-rigid body system, in which rigid bodies were connected with each other by a linear spring and damp. Combining the potential energy of vertical vibration of the track with that of the metro train, the total potential energy of vertical vibration of the train and track was obtained. And then, the matrix equation of vertical vibration of the system was established using the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position" rule for formulating system matrices. The vibration responses of the system can be obtained by solving the matrix equation with the direct time integration such as Wilson-θ method.

摘 要：针对浮置板式轨道结构特点，取相邻2个扣件之间的轨道为1个轨段单元，钢轨视为连续弹性点支承Euler梁，浮置板视为弹性薄板，扣件系统及橡胶支座均模拟为线性弹簧及粘滞阻尼器，建立浮置板式轨道振动模型；将城轨列车中的车辆均离散为多刚体系统，各刚体之间通过线性弹簧及粘滞阻尼器相连，建立列车振动模型；将浮置板式轨道及列车振动势能叠加，得到系统竖向振动总势能；基于弹性系统动力学总势能不变值原理及形成系统矩阵的"对号入座"法则，建立此系统竖向振动矩阵方程；采用Wilson-θ逐步积分法求解此矩阵方程，得出此系统竖向振动响应。

The possibility of characterisation of particle surface energy and surface energy componentchanges due to surface modification by thin layer wicking technique is studied.

本文研究了用薄板毛细渗透技术表征表面改性导致的粉体表面能及其各成分的变化的可能性。

The surface of alveolate aluminum is a layer of firm aluminum alloy slab and what inside is beehive structure with aluminum foil.

蜂窝铝的表面为一层坚硬的铝合金薄板，而中心层是用铝箔制成的蜂窝结构。

Since its estalishment.the company has always upheld the busness idea"Quality First、Outstanding Keeping Credit,Customer Supreme"The main products link four-column pressure forming machine series,flat vulcanizing machineseries.sheet stretcher series,rubber-plastic foamingmachine series,and pressure forming machine series for friction materials are widly applied to pressure processing the formable materials,rubber products.and forming the themoset materials,etc.

企业自创办以来，始终遵循&质量第一、追求卓越、尊信守约、客户至上&的经营方针；经多年创新与不懈努力，具体产品有：四柱压力成型机系列、平板硫化机系列、薄板拉伸机系列、橡塑发泡成型机系列、摩擦材料压力成型机系列等；广泛适用于可塑性材料的压力加工、橡塑制品等熟固性材料的成形。

Secondly, by the numerical simulation "experiments" and mechanics analyses, the effects of temperatures, forming velocities and the entering angles of mould on the products were studied. The main invaliding forms both of crinkling and crazing were simulated and analyzed, so that the technical parameters of forming, geometrical parameters of moulds were optimized.

其次，通过对TC1钛合金薄板整流内罩的深拉热成形的数值模拟&实验&和力学分析，探讨温度、成形速度和模具压边力等对成形产品的影响，模拟分析了&起皱&和&拉裂&等主要失效形式，对成形工艺参数、模具几何参数等进行了优化。

In the pack rolling of thin sheet, it is not use water cooling for the quickly decreasing of temperature of the work piece. The temperature of work roll is 300~400℃. Now the sliding bearing can not be lubricated by normal lubrication oil but massive asphalt. Mist and dust created by asphalt burning pollutes the environment of workshop.

在薄板叠轧工艺中，为了使工件温度快速下降减缓，不应该使用速冷，工作辊温度在300~400℃之间，这时，滑动轴承不应该使用普通润滑油润滑，而应当使用大量的沥青，沥青加热产生的蒸汽和灰尘会污染厂房的环境。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。