Speed reducer; design; epicyclic friction pulley; velocity ratio
减速器；设计；行星摩擦轮；速比
Due to the high velocity jet of water, they form a negative pressure around the room so have a vacuum device, and as a result of the second steam jet flow with the direct contact heat exchange, the vast majority of steam condensing into water, not a small amount of steam and condensate non-condensing gas is also due to high-speed jet of water and friction with each other, mixed and extruded through the diffuser tube to be excluded, so that the formation of higher browser indoor vacuum.
由于喷射水流速很高，于是周围形成负压使器室内产生真空、另外由于二次蒸汽与喷射水流直接接触，进行热交换，绝大部份的蒸汽冷凝成水，少量未被冷凝的蒸汽与不凝结的气体亦由于与高速喷射的水流互相摩擦，混合与挤压，通过扩压管被排除，使器室内形成更高的真空。
The LVFC can adjust the dampers friction force in proportion with relitive velocity of damper, made it acting like a viscous damper.
其次，我们根据压电摩擦阻尼器反应迅速的特点设计了局部速度反馈控制，作为局部控制策略。
Carbon fiber medium copper graphite composites with various carbon fiber contents were prepared by means of powder metallurgy. The dry friction tests of the composites under no current or current density of 20 A/cm 2 were conducted for 50 h under sliding velocity of 15 m/s and load of 4.9 N.
对采用粉末冶金法制备的含不同质量分数的碳纤维－中铜－石墨复合材料，在滑动速度为15m／s，载荷4.9N的条件下，分别进行了50h的不通电和通电干摩擦试验，并用扫描电镜对其磨损表面进行了观察分析。
The results show that the wear rate of bonded graphite solid lubricating coating decreases with the increase of velocity and load, whereas the friction coefficient decreases with the increase of load, and increases slowly with the increase of velocity. The high load and velocity can promote the formation of the fine transfer films in opposite parts under fretting friction condition, so the bonded graphite solid lubricating coatings show high load-bearing capacity, fine antifriction and antiwear properties.
研究结果表明：粘结石墨基固体润滑涂层的磨损率随着试验载荷和摩擦速度的增大而减小；而摩擦因数随着试验载荷增大而减小，随摩擦速度增大而缓慢增大；在微动摩擦过程中，高载高速可以促进高质量转移膜在对偶表面形成，从而使得粘结石墨基固体润滑涂层具有良好的抗承载能力和优异的抗磨减摩性能。
The results show that the wear rate of bonded graphite solid lubricating coating decreases with the increase of velocity. The high load and velocity can promote the formation of the fine transfer films in opposite parts under fretting friction condition, so the bonded graphite solid lubricating coatings show high load-bearing capacity, fine antifriction and antiwear properties.
研究结果表明：粘结石墨基固体润滑涂层的磨损率随着试验载荷和摩擦速度的增大而减小；而摩擦因数随着试验载荷增大而减小，随摩擦速度增大而缓慢增大；在微动摩擦过程中，高载高速可以促进高质量转移膜在对偶表面形成，从而使得粘结石墨基固体润滑涂层具有良好的抗承载能力和优异的抗磨减摩性能。
Based on the principle that the bed shear stress and friction velocity of the grass cover in the model should equal those of actual condition in which grass cover is destroyed due to scouring, an experimental equipment was designed to simulate the scouring flow with high velocity in actual rivers and to measure the hydraulic parameters during the scouring process.
基于模型和原体草皮冲刷破坏时床面切应力和摩阻流速应该相等原理，研制了一套可用于模拟实际河道中的大流速冲刷水流，并测定冲刷过程中植被水力学参数的试验装置。理论分析表明，水槽设计高度对植被区的床面切应力值不存在主导性影响。试验测得的有机玻璃水槽和草皮表面曼宁糙率系数值，以及试验土壤起动流速结果证明所设计的试验装置和方法是合理可行的。在此基础上进行了植被护坡抗冲模型试验，得出了草皮护坡破坏的临界水流条件
It is found that the friction coefficient increases with the increase of sliding velocity, and there is critical velocity.
试验发现，摩擦系数随滑动速度的增加而增加，存在临界滑动速度。
In the paper, by using equivalent linearization technique, the response computation of a single_degree_of_freedom dry friction damped system with velocity_dependent variable coefficient of sliding friction under harmonic excitation is discussed.
研究了单自由度滑动摩擦系数随相对速度变化的干摩擦振动系统简谐激励响应计算问题，提出了等效线性化处理方法，并推导了相应的频响方程。
Under the condition of dry friction, a systematic study has been done on the weight loss and the friction coefficient of composites and the relations between the properties and content of the filling, the load and the sliding velocity.
在干摩擦滑动磨损条件下，对PTFE材料及其复合材料的磨损失重、摩擦系数及磨损机理进行了研究，同时对其与磨损外部条件和材料的内部因素(填料的含量、粒径、种类)的关系进行了较为系统的研究。
The friction force increases with the increase of velocity when the tip scanning velocity is not high due to the effect of stick-slip behavior between the tip and sample, but their relationship comes to a reverse with the increase of scanning velocity which is caused by the phase transformation of the DLC films.
在扫描速度较小时，由于针尖和样品之间的粘滑作用，摩擦力随探针扫描速度的增加而增大；而当扫描速度较大时，由于DLC薄膜发生相结构转变的缘故，摩擦力却与扫描速度成反比关系。
When the internal Froude number is small, the upper vortex pair of the modons are almost unaffected by the bottom friction while the lower vortex pair decay in their amplitude and velocity.
当内佛罗德数较小时，摩擦对完全偶极子的上层涡旋对的影响较小，而下层涡旋对的振幅和速度都发生衰减。
This textis on the basis of research results of existing experts and scholars, from analysing each parameter and influence factor of slurry pipeline transport set out, regarded the ratio of 0.92D's volume percent solids and 0.5D's volume percent solids more than 0.8 which were put forward by Wasp as the key point, turning the ratio of volume percent solids into the ratio of Settling velocity of a particle and friction velocity. A new model is set up to calculate Velocity for Homogeneous flow in Horizontal Pipeline.
本文在现有专家学者研究成果的基础上，从分析浆体管道输送的各个参数及影响因素出发，以瓦斯普提出的将管内0.92D处浓度与0.5D处浓度的比值大于0.8时的浆体看作是均质流作为突破口，从浓度的比值转化为固体颗粒在水中的沉降终速度与管道的摩阻流速的比值出发，来建立非均质浆体的均质流界限速度新模型，通过此模型来预测出均质流界限速度。
The calculation results show that the vane's moving velocity decreases with the increase of obliquity, while the vane's acceleration increases with the increase of obliquity. So choosing the vane's obliquity accurately can reduce the friction wear and improve the machine's reliability greatly.
结果表明，滑板运动的速度随倾斜角增大而减小，加速度随倾斜角增大而增大，所以合理选择滑板倾斜角可大大降低摩擦磨损，提高可靠性。
In order to get virtual origin and friction velocity of riblet surface, experimental data is managed based on Musker flow velocity distribution formula.
为了获取脊状表面的虚拟原点和摩擦速度，尝试运用Musker全壁面律公式的回归拟合方法对实验数据进行处理。
It is wrong to say that ACPUL tests parachutes in free fall and DHV does not: for paragliders, ACPUL makes one test dropping an 80 kg weight for 5 seconds (ignoring friction, reaching a maximum of 176 km/h) while DHV drops a minimum weight of 100 kg from 85 m (providing a top velocity of 147 km/h).
这些数据并不能说明ACPUL和DHV的试验方案是错误的（注：因为两者的试验方案重物阻力都比人体小），ACPUL使用80kg的配重自由下坠5秒测试一次（如果忽略阻力的话，可以达到176km/h的最大速度），而DHV采用100kg，下坠85m（提供最大速度147km/h）。
The wall function is adopted such that a resultant stream-wise velocity, U, is expressed by a local friction velocity at a first grid point to the wall of the computation domain.
和实测资料的对比验证了数值计算和边界处理技术的合理可靠性，并进一步分析复式断面明渠二次流运动的流动结构和特性。
With increasing the applied load and sliding velocity, the friction coefficient decreases.
随着载荷和摩擦速度的增加，摩擦系数减小。
The friction coefficient slightly decreases with the increasing of sliding velocity in the range of 1~13ms〓.
随滑动速度的增加，合金的摩擦系数略微减小，随摩擦时间的增加，摩擦系数先增加后减小并趋于稳定。
In millinewton scale, friction force of modified samples increases with load and sliding velocity increasing.
在毫牛尺度下，改性表面的摩擦力均随滑动速度和载荷的增大而增大。