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frictional coefficient
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  摩擦系数
     The main characteristic targets were that the tensile strength was 50 - 60MPa, the notch impact strength ≥12kJ/m2, the frictional coefficient was 0.20 - 0.30. The accuracy grade of small mould number gear (m=0.5, Z=72) by this blend could be Grade 7 (See GB2363- 80).
     POM/LDPE/Z-1共混物的主要性能指标为:拉伸强度50~60MPa,缺口冲击强度不小于12kJ/m~2,摩擦系数为0.20~0.30,用该共混物制作的小模数齿轮(m=0.5,Z=72)的精度等级达7级(参见GB 2363-80)。
短句来源
     The obtained frictional coefficient is 0.485 at Shengou, 0.57 at Guanchang, 0.556 at Nanma, 0.75 at Zoli, 0.41 at Dingxiling, 0.33 at Xiataoyuan, and 0.705 at Butterfly Spring.
     得到的摩擦系数是:深沟—0.458,官昌—0.57,南马—0.556,苴力—0.75,定西岭0.41,下桃园—0.33,蝴蝶泉—0.705。
短句来源
     Research on SM-1 Type of Synthetic Fiber Brake with High Frictional Coefficient
     SM-1型高摩擦系数合成闸瓦的研究
短句来源
     The PPS:PHBA:PTFE (3:1:1) polymer alloy exhibited excellent self-lubricity and wear resistance,with a frictional coefficient of 0.19 and abrasion loss of 0.7mg/120min.
     最后,采用正交设计法优选出PPS/PHBA/PTFE多组分合金性能最佳的配比,注射成型制备了PPS:PHBA:PTFE为3:1:1的性能优异的自润滑合金,具摩擦系数为0.19,磨耗量为0.7mg/120min,拉伸强度53MPa。
短句来源
     The results show that,with the braking speed increasing,the frictional coefficient rise to the maximum of 0.46 at 10 m/s firstly and then fall,and at the same time the high frequent vibration begin to appear over 20 m/s;
     结果表明:摩擦系数随制动速度提高先升高而后降低,在制动速度为10 m/s时达到最大值0.46,且当制动速度超过20 m/s时产生高频振动;
短句来源
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  摩擦因数
     The frictional coefficient of(10~30)% SiCp/Al composites is in the range of 0.3 to 0.5 in the experiment.
     试验条件下,SiC/Al复合材料与GCr15钢的摩擦因数在0.3~0.5之间。
短句来源
     Study of Correlation between Micro-scale Frictional Coefficient and Elastic Modulus of Hard Thin Films
     硬质薄膜材料弹性模量与其微观摩擦因数关联性研究
短句来源
     Effect of Thickness and Hardness of Rubber Underlayer on Frictional Coefficient of Water-lubricated Integer Bearings
     橡胶层厚度和硬度对水润滑整体式轴承摩擦因数的影响
短句来源
     (2) Fe and SiO2 can increase frictional coefficient, but their mechanism are different in friction because of their different property,joint intensity with matrix and surface state.
     (2)Fe、SiO_2都可提高摩擦因数,但二者增摩效果不同,这与它们自身的属性、与基体的结合能力、表面工作膜的形成以及在摩擦过程中的作用机理不同有关; SiO_2能较大地提高材料摩擦因数,但增加了低转速条件下的磨损量。
短句来源
     Distribution of elastic stresses on the contact surface of the specimen and the rectangular pad was analyzed in detail using a finite element solver ANSYS. The correction of the finite element model was verified. The contacting status(sticking, sliding and opening) and contact stresses on the contact surface were calculated to investigate the effect of the nominal contact pressure and frictional coefficient on the distribution of the contact stress.
     以方足微动桥试样接触几何条件为研究对象,应用ANSYS有限元分析软件对其接触面上的应力分布进行弹性有限元分析,验证用ANSYS所建计算模型的正确性,分别计算不同名义接触压力和不同摩擦因数条件下接触状态(粘着区、滑动区、张开区)和接触面应力分布,选取不同水平的循环载荷进行计算,研究接触状态和应力分布随循环载荷的变化情况。
短句来源
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  摩阻系数
     Energy losses, frictional coefficient and the optimum economical pipeline diameter at different flow rate of CWS can be revealed by solving the model.
     从该模型的求解可以得到水煤浆管道输送过程中的能量损失、范宁摩阻系数随管径的变化及不同输送量下的管道输送最佳管径。
短句来源
     The parameter analysis shows that prestressed pipeline frictional coefficient, the deviation factor, modulus of elasticity, temperature difference, concrete shrinkage and creep are key factors to box girder's alignment.
     参数分析结果表明:预应力管道摩阻系数、偏差系数、弹性模量、日照温差是影响箱梁线形的主要因素。
短句来源
     Based on the shear tests in the laboratory,the author suggests the right method of measuring frictioral coefficient between soil and reinforcement in reinforced earth retaining wall,considering other information,amd presents the reasonably value of frictional coefficient.
     本文通过室内的土与加筋之间的直剪试验,提出了土与加筋之间摩阻系数的妥当的测定方法,给出了摩阻系数的合理取值范围。
短句来源
     It is also Pointed out that for sake of safety,frictional coefficient should be considerde carefully in the design of reinforced earth retaining wall.
     最后,本文指出对具体工程.更应该在设计中慎重考虑土与加筋之间的摩阻系数,使加筋土工程具有一定安全性。
短句来源
     It was a key and difficult job for the steel cofferdam to touch rocks and lay a foundation. The cofferdam sank down smoothily and controlled the blade to turn over sand through the calculation of average frictional coefficient of cofferdam at 27.5 kPa and the sinking coefficient more than 1.25.
     钢围堰着床、奠基是一道关键工序 ,且难度较大 ,本文通过计算围堰摩阻系数平均在 2 7 5kPa时下沉系数不小于 1 2 5的情况下 ,围堰下沉顺利 ,且可有效控制刃脚翻砂
短句来源
  “frictional coefficient”译为未确定词的双语例句
     However , the static frictional coefficient of 0.020-in round SS arch wire C was greater than that of the control group after their exposure to oral conditions for 8 , 12 , 16 , 20 weeks ( P <.01 ) .
     2、尖牙远移阶段,0.020”不锈钢圆丝C和D在口腔内使用4周、8周、12周、16周及20周后,弹性模量、屈服强度及挠度变化无显著性意义(P>0.05);
短句来源
     Experimental Testing of Frictional Coefficient of Braker in Pit Lift
     提升机制动装置磨擦系数实验测试研究
短句来源
     Weaving frictional material,soaked by water soluble phenolic resin,is tested by the DMS-1 constant speed friction and wear tester according to the standard of GB/T11834-2000.The results showed that the material frictional coefficient increased with NaOH increasing,dissolubility and stability improved,too.
     所浸渍的无石棉制动带产品试样经过DMS-1定速摩擦磨损试验机并按照GB/T11834-2000标准进行了测试。
短句来源
     METHOD OF DETERMIiNING FRICTIONAL COEFFICIENT OF BOREHOLE OF HORIZONTAL WELLS
     水平井井眼摩阻因数的确定方法
短句来源
     The formulas of the frictional coefficient has been deduced based on experiments.
     在实验基础上导出阻尼系数的计算公式。
短句来源
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  frictional coefficient
The squeezing load is shown to be a decreasing function of the Weissenberg number, while the frictional coefficient is only weakly-dependent on the Weissenberg number.
      
Bounds on flow rate, frictional coefficient, centre of pressure and time-height relation are obtained and compared with classical case, Gross [1].
      
These characteristics as affected by various rolling conditions (e.g., thickness ratio and shear yield stress ratio of the raw clad sheet, roll speed ratio, reduction, frictional coefficient, roll radius ratio, etc.) were analyzed systematically.
      
The similar surface conditions after a relative longer shear-sliding distance on polished surfaces lead to the same steady state frictional coefficient, 0.61, for both finishing surfaces.
      
In comparison with the untreated SiC nanoparticles, the grafted SiC nanoparticles led to more significant reduction in frictional coefficient and wear rate of epoxy.
      
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In the original resistance data for the Taylor Standard Series,its skin frictional resistance was caleulated by Tideman formula.Gertler reanalyzed the original test results using Schoeuherr frictional coefficients.In addition, corrections for water temperature,laminar flow and restricted channel effects were allowed in the reanalysis.A brief recommendation is here made as follows.

在原来泰洛标准组阻力数据中,其摩擦阻力系用铁特门公式计算.袭德立用桑海摩擦系数对原来试验结果重加分析.此外,在重分析中对水温、层流及限制水道各种影响加以修正.现作简略介绍于下.

First of all, this paper discusses how to choose smoothing coefficient in accordance with the grid size of space. Secondly we study the influence on the solution of the differential equation by adding frictional term in the vorticity equation, and then show how to choose suitable frictional coefficient in this case. Thirdly we discuss the influence for computational stability of the finite difference scheme after adding frictional term in the vorticity equation. It is shown that the computation is...

First of all, this paper discusses how to choose smoothing coefficient in accordance with the grid size of space. Secondly we study the influence on the solution of the differential equation by adding frictional term in the vorticity equation, and then show how to choose suitable frictional coefficient in this case. Thirdly we discuss the influence for computational stability of the finite difference scheme after adding frictional term in the vorticity equation. It is shown that the computation is stable, if taking the frictional term in the (n-1) time layer in the normal centered time difference scheme. If taking the frictional term in the n time layer, then the computation of the difference scheme is unstable. At the same time, the time forward difference scheme may be stable also after adding frictional term, but the frictional coefficient required is then much larger. Finally, we discuss the relation between the smoothing process and frictional term for numerical prediction using the vorticity equation. From the viewpoint of computation, the two things are not equivalent. But we might determine suitable smoothing coefficient by comparing the smoothing process in a diffusion equation.

本文首先讨论了如何依据空间步长来选取平滑系数。其次考虑在涡度方程中加上粘性项后对微分方程解的影响,讨论如何选取适当的粘性系数。第三讨论涡度方程加粘性项后对差分格式计算稳定性的影响,证明了在常用时间中心差分格式中应把粘性项取在第(n-1)时间层,这样计算才是稳定的。反之,如把粘性项取在第n时间层,则差分格式计算不稳定。并且时间向前差的格式在加上粘性项后也可以稳定,但要求的粘性系数过大。最后讨论了用涡度方程作数值预告时加上平滑过程与加上粘性项之间的关系,从计算上看,二者并不等价。但可以把平滑过程与扩散方程类比,以确定适当的平滑系数。

The pressure drop and solid slug velocity in horizontal pulsed dense phase pneumatic transport are investigated by using PVC powder as transporting material. It is shown that the velocity of solid slug equals to 0.51 times gas velocity approximately. As suggested by Barth, The total pressure drop may be Correlated as the sum of pure air pressure drop and the additional pressure drop due to the presence of solid particles. The frictional coefficient of additional pressure drop related to gas Froude number...

The pressure drop and solid slug velocity in horizontal pulsed dense phase pneumatic transport are investigated by using PVC powder as transporting material. It is shown that the velocity of solid slug equals to 0.51 times gas velocity approximately. As suggested by Barth, The total pressure drop may be Correlated as the sum of pure air pressure drop and the additional pressure drop due to the presence of solid particles. The frictional coefficient of additional pressure drop related to gas Froude number may be represented by λ_m=3.75F_r~(-1.6). A capacitance probe technique, which has no perturbation of flow condition is successfully used to record the flow pattern of solid slug. After simple treatment of the recorded picture, the velocity of solid slug and related parameters are obtained.

本文以聚氯乙烯树脂为输送物料,测定了水平脉冲气力输送的料栓速度和压力降。得出料栓速度可近似表示为气速的0.51倍,压力降可用Barth提出的空气压力降和因存在固体而产生的附加压力降之和来处理。而附加压力降关联式中的附加摩擦系数可用气体弗鲁德数来关联,得到λ_m=3.75Fr~(-1.8)的表达式。本文还介绍了栓塞在管内流动的状态可用不影响其流态的电容法测量技术来记录,经简单处理后即可得到料栓速度等有关参数。

 
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