Methods: Eight fresh-frozen human cadaveric knees had tibiofemoral peak contact pressures and contact area measured in the control state. 方法:在对照情况下选取八个新鲜冷冻尸体的膝关节,测量其胫股峰值接触压力和接触面积。
But the peak of contact pressure between rolls forms when the intermediate roll shifts, which leads local wear of rolls and quality defects of strip. 但由于中间辊轴向窜动后,在工作辊与中间辊、中间辊与支撑辊间形成接触压力峰值,导致轧辊局部磨损及带材表面质量问题。
Aim: to investigate the peak value of foot plantar pressure, contact area and impulse in double feet during the natural walk of normal young people, and explore the distribution rule of foot pressure parameters. 目的:观察正常青年人自然行走过程中左右双足峰力值、接触面积、冲量等参数特征,探索足底压力参数的分布规律。
Galleon, which had about$ 7bn in assets at its peak, paid large amounts to banks because it specialised in short-term trading strategies, which put its officials in close and frequent contact with Wall Street traders and salespeople. 帆船基金之所以向银行支付大笔资金,原因在于该公司专注于短线交易策略,这使得其高级职员与华尔街交易员和销售人员联系紧密且频繁。在巅峰时代,帆船公司拥有约70亿美元资产。
The results show that the peak value of contact pressure on the contact area for the surface with micro roughness was much larger than that for smooth surfaces, and the rough surface went into plasticity. 结果表明,轮轨表面微观粗糙度使得接触区的峰值接触压力大大高于平整接触表面的接触压力,会造成轮轨表面出现塑性变形。
With the decreasing of the CE angle, contact pressure and peak stress increased remarkably, and the contact area decreased as well. 随着CE角的减小,接触压力和峰应力明显增高,接触面积下降。
A series of peak values of stresses exist on contact surface, which made the material on the surface of rail and wheel go into plasticity. 结果表明,对于有表面微观粗糙度的轮轨,在接触区会出现很大的峰值接触应力,并造成轮轨表面出现塑性。
Quick algorithm for computing the peak stress of contact 计算接触峰值应力的快速算法
The main contents are: The digital filtering technique of two-dimensional signals is used for filming away the waves which have no influence on the contact accuracy of gears ( i. e. the generatrix of the wave peak or the wave valley are parallel to the contact line). 主要内容包括:应用二维数字信号滤波技术滤去不影响斜齿轮接触精度的波纹(即波峰或波谷的母线平行于接触线的波纹);
A method is proposed to compute the peak stress of elastic contact problems vector-cone method. 本文介绍一种计算弹性接触问题峰值应力的快速算法&向量锥方法。
The peak shifts become smaller when an electron flood gun is switched on, and the peak shifts disappear when conducting samples are in electrical contact with the sample holder. 在同时使用电子中和枪时谱峰位移变小,当导电样品与样品托有良好的电接触时谱峰位移消失;
The smaller the axial tolerance of bear is, or the lower the hardness of material making of friction pair is, the lower the peak contact pressure will be. 轴承摩擦副材料硬度越低,相应的峰值接触压力越低。
Dependences of the friction coefficient between the planet and stator on the parameters under profile peak contact are given. 给出了行星轮与定子全部为凸峰接触时摩擦系数随传动参数的变化规律;
It has been found that the pressure distribution is non symmetrical, the friction coefficient is the most important factor affecting the pressure distribution, it usually lowers the peak contact pressure and increases the contact area. 认为摩擦系数可使峰值接触压力降低和接触面积增加,增大载荷会使接触压力分布的不对称性更为明显;
By using ANSYS to analyze the model, the optimal results show that the peak contact pressure of optimal solution is 34.6% less than that of ideal model and that the distribution of contact pressure is reasonable. 利用ANSYS软件进行接触有限元优化设计,优化结果表明:最优方案的峰值接触压力相对理想模型(无鼓形度)降低了34.6%,并且接触压力分布合理。
Dynamic foot pressure was determined three times during the first step, and the mean peak value of force, contact area and impulse were calculated. 所有受试者测试期间足踝关节活动正常,测试时均脱鞋袜,以个人平常步态自然行走,一步法测量两脚各3次动态足底压力,计算足底各个区域的平均峰力值、接触面积和冲量。
Using four evaluation criteria of contact peak, the thermal contact resistances of machining surfaces are calculated. 分别采用四种接触峰的评定标准,对实际机械加工表面的接触热阻进行了计算。
When the peak stress is same, the absorbed energy of material under the repeated impact contact load is more than under the static fatigue load. And absorbability is in inverse proportion with the distance from the impact point. 当峰值应力相同时,材料在多冲接触载荷下比静载荷和静疲劳载荷下吸收的能量多,且吸收量与离冲击点的距离成反比。
We found that the peak of conductivity of compressed powder disc consisted of contact conductivity and bulk conductivity. 发现粉末压片电导率峰值是由非晶微粒间的接触电导及非晶微粒体电导两者叠加;
Yuan dynasty is not only an important phase of the formation of northern Mandarin, but also the peak period in which Altaic languages contacted with Chinese extensively. The long time contact among languages of different types should have caused some changes of Chinese. 元代是汉语北方官话形成的重要阶段,也是北方阿尔泰语同汉语发生大规模接触的鼎盛时期,不同类型语言之间的长期接触,必然会对汉语的面貌产生某些影响。
The results of FTIR indicated that the titanium oxide film can produce hydroxyl group activated by HCL and H_2O_2. The peak of O element corresponding to hydroxyl group increased in results of XPS, the contact angle was lower. Ti-O膜经盐酸和双氧水活化后,FTIR结果显示表面可产生羟基基团,XPS中-OH对应的O峰位增强,接触角减小。
The result from the analysis can be used to calculate the radius of Hertz contact in the contact surface, the compression and the peak contact stress. 该过程得到分析结果可以用于计算在赫兹接触过程中的接触面半径、压缩量和单位接触应力峰值。
Concluded that, the greater the impulse of the ball, the higher the peak contact force between aluminum honeycomb panel and ball. 获得结论为,钢球冲量越大,钢球与蜂窝铝板碰撞接触峰值力越高,接触时间越短。
The Sino-Arab exchange of this period surpassed previous generations entirely. The Spice Route, being interruptive for a long time, was opened up again. It pushed Sino-Arabic relations to a peak and laid profound influence on the contact later ages. 这一时期的中阿交往全面超越前代,中断已久的香料之路被重新开启,中阿关系走向历史发展的最高峰,这对后世中阿交往产生了深远的影响。
Increase the core density can resist impacting deformation, the greater the density, the shorter the contact time, the higher the peak contact force. 增加蜂窝芯层密度可以有效抵抗冲击形变,密度越大,碰撞接触时间越短,接触峰值力越高。
However, most of the gear transmission mesh in the mixed lubrication state, that is, the lubricant film and the direct collision of the rough peak exist between two contact tooth surfaces, there is an obvious difference with the Hertz theory. 然而,绝大部分齿轮传动都处于混合润滑状态,即在两接触齿面之间既存在着将其分开的润滑油膜又存在着直接碰撞的粗糙峰,这显然与Hertz理论有很大的区别。