Engine using variable valve timing technology can improve the intake charge, so that coefficient of charge increase, engine torque and power can be further improved.
发动机采用可变气门正时技术可以提高进气充量，使充量系数增加，发动机的扭矩和功率可以得到进一步的提高。
Based on the above research, some identification methods of rotor resistance, moment of inertia, viscous coefficient and load torque are presented by using neural network.
应用人工神经网络的方法，在所建立的状态增量型动态数学模型研究的基础上，提出了转子电阻、系统转动惯量、粘性摩擦系数和负载转矩的辨识方法，在此基础上通过在前向通道串入一个校正装置的方法，提出了转子电阻和负载转矩扰动影响的补偿和校正的方案，辨识方法和校正方案具有结构简单、使用方便的优点。
Afterwards, we propose a new constant coefficients measurement method in dynamic equation of robot manipulators, this measurement method includes three groups of experiments: group one, let each joint of robot manipulator keep static to measure the constant coefficients in gravity term of dynamic equation and Coulomb frictional torque, group two: let only one joint of robot manipulator move at a constant velocity to measure the viscous frictional coefficient and constant coefficients in effective inertia of dynamic equation, group three: let only one joint of robot manipulator move at constant acceleration at a time to measure constant coefficients in Coriolis and centrifugal term and coupling inertia of dynamic equation.
让操作器单个关节恒速运动，在对驱动系统中传动机构，减速装置和电感系数综合考虑的基础上，这组实验对粘滞摩擦系数及有效惯量中常数系数进行测量。这种测量方法只要求旋转关节的驱动电机施加恒定电压，回转关节驱动电机施加正弦波电压。3。让操作器单个关节恒加速运动，这组实验测量动力学方程中哥氏力、离心力项和耦合惯量项中的常数系数，这种测量方法只要求单个关节匀加速运动，而其它各关节保持静止，这种测量方法虽然要求关节匀加速运动，但不必进行关节角加速度检测，而只需进行关节角位移和角速度检测即可，输入量直接给定为输入电压。
In order to investigate the influence of the pass parameters on the tandem rolling process of aluminum tube, a numerical simulation project was designed by orthogonal experiment optimization design method. On the FEM software platform of Marc, the influence of roller pass parameters including the side wall angle, the ratio of side wall radius, the fillet radius, the roll gap size and the friction coefficient between the roller and tube billet on the rolling force, rolling torque, the external diameter ovality and the wall thickness unevenness was investigated. Moreover, the effect order of the parameters was analyzed.
摘 要：为了研究孔型参数对铝管连轧过程的影响，采用正交试验优化设计方法设计数值模拟方案，在Marc有限元平台上，研究轧辊孔型参数(侧壁角、侧壁半径比、过渡圆角半径、辊缝大小、轧辊和管坯之间的摩擦因数)分别对轧制力、轧制力距、外径椭圆度和壁厚不均的影响，并分析各参数的影响显著性顺序。
Electromagnetic theory and the damper working condition were used to deduce theoretically the formula of fluctuating current in the damper coil as the rotor whirled. The formulas of damping coefficient and stiffness coefficient of damper were obtained and the additional power loss of electromagnetic retardation torque in an unlaminated rotor system was discussed. The influence of the static current and rotating speed on the damper characteristics was analyzed.
基于电磁学原理和阻尼器的工作条件，推导出转子涡动时线圈中波动电流的计算公式，得到了阻尼器的阻尼系数和刚度系数的计算公式，讨论了非叠片转子系统电磁阻力矩的附加功耗问题，并通过数值计算和实验研究了静态电流和转速对阻尼器工作特性的影响。
The torque transmitted is related to the actuating force, the coefficient of friction, and the geometry of the clutch or brake.
扭矩传送的是与驱动力，摩擦系数和几何的离合器或制动。
The study of the conduction coefficient C, in prolonged-exposure tests revealed that it was only slightly dependent on variables of the sprinkler fitting, such as absence or variations in mounting torque, depth of thread engagement, material, and the type of sealant for the sprinkler thread.
本文中具体描述了喷头热响应中存在的传导热损失，并在实际火灾试验结果的基础上加以验证。
The torsion coefficient of bolting is tested with the intelligentized axial force tester and high precision torque spanner, to guarantee the data result veracious and reliable
螺栓连接副扭矩系数测试采用先进的智能轴力检测仪和高精度扭力扳手，保证测试数据准确、可靠。
The conclution shows that the dynamic response process gets faster with the increase of torque and speed at the working point and the feedback coefficient of the system.
在以上工作的基础上，对HVD转速闭环控制系统的动态响应过程进行了理论分析、数字仿真和实验研究，得出系统动态响应过程随着系统工作点处扭矩和转速以及系统反馈系数的增大而加快的结论。
Being based on the expression, the effect of pole arc-coefficient on cogging torque is studied.
在此基础上，提出了极弧系数的最佳确定方法。
Based on the torque-equilibrium condition of vertical rolls, the equations of neutral angle were derived. The forward slip coefficient between the vertical roll with the base and head of rail were derived based on the law of constant rate of flow.
基于立辊的力矩平衡条件，推导出轨头、轨底变形区的中性角公式，并根据秒流量相等理论，推导出轨头和轨底相对于立辊的前滑系数公式。
The K coefficient of the connector for large-sized high strength hexagonal head bolts, the P force of the connector for torque-shear type high strength hexagonal head bolt, and the anti-slip coefficient of the frictional surface of high strength bolts are the crucial properties to be tested in evaluating steel structures for acceptance.
大六角头高强度螺栓连接副扭矩系数的检测，扭剪型高强度螺栓连接副坚固预拉力的检测，高强度螺栓连接磨擦面抗滑移系数的检测，是钢结构材料验收中的重要测量。
With increasing temperature of separate plate, shapes of friction torque became dissymmetrical, and dynamic and static coefficient of friction declined in this process.
以自制炭纤维增强纸基摩擦材料和45#钢为摩擦副，采用惯量试验方法研究了温度对摩擦副摩擦性能的影响。
The frictional torque, friction coefficient and temperature rise were investigated with this test device. The advantages of this study are that the transient processes of friction, wear and lubrication during the period of starting and stopping of the shaft of the test rig. Fourthly, the levels of bionic design of integrated coatings, which are data level, program level and function level, were studied in detail.
实验研究了多种整合涂层的性能，测量了摩擦力矩、摩擦系数与温度的瞬时变化规律，特别是获得了起动阶段、停车阶段的摩擦学动态特性，分析了不同层次间的知识关联，对整合涂层的数据层、程序层与功能层进行了较详细的研究。
For the first time, a screw pile and pile driver system for preventing flood and rushing to deal with an emergency was manufactured. The screw piles of the system is different from screw drills used to sap, and it doesn`t push soils out. Analyses, including the screw pile`s structural strength analysis and the screw blade`s welding analysis, were done by ANSYS, which showed that the screw pile`s structural strength is enough and that the distort of the screw blade is small. Testing on the screw pile and pile driver system showed that the system performed stably and could meet the need of preventing flood and rushing to deal with an emergency. A mechanics model of interaction of a screw pile and soil was built, and expressions of torque of screw pile`s cylindrical part on the condition of screw pile`s crew part being driven into soil fully were gained, then the relation of the torque with screw pitch and out diameter of cylinder, which shows the torque decreases with the screw pitch increasing, and that the torque increases with the out diameter of cylinder increasing, which was according with the experiments of the screw pile`s being driven into soils, and thus a screw pile with the best structure was chosen. Experiments of bionic surface showed that, on the condition of certain pressure on the surface, the protruding bionic surface can not reduce adhesion and resistance and that the corrugated bionic surface can reduce adhesion and resistance. An orthogonal experiment of the corrugated bionic surface was done with the factors including the width of protrusion, the space between two protrusions, the trolley`s velocity and the vertical surface pressure and with the surface frictional coefficient as the experimental target, and some inclusions were drawn that the best combination of the factors was acquired and that the width of protrusion affected the surface frictional coefficient remarkably.
研制了防汛抢险螺旋桩机系统，提高了沉桩作业效率；利用ANSYS对桩体进行整体结构强度分析以及螺旋叶片的焊接分析，表明桩体结构强度足够，焊接过程中，螺旋叶片的变形小；对整个螺旋桩机系统进行试验，表明该系统性能可靠，工作稳定，作业效率高，能够满足防汛抢险沉桩作业基本需要；建立了螺旋桩桩土作用力学模型，得出螺旋桩沉桩过程中螺旋桩螺旋部分完全进入土体时螺旋桩圆柱部分所受扭矩以及扭矩与防汛抢险螺旋桩的螺旋导程和圆柱外径的关系曲线，表明螺旋桩螺旋部分完全进入土体时螺旋桩圆柱部分所受扭矩随着螺旋导程的增大而减小，随着圆柱外径的增大而增大，这与螺旋桩沉桩试验结论相符合，据此优选出最佳结构的螺旋桩；仿生曲面试验表明，尺寸较小的球冠突起型仿生曲面在一定压力作用下未能起到减粘降阻的作用，而尺寸较大的波纹型仿生曲面相对平板具有一定的减粘降阻作用；以波纹型仿生曲面突起宽度、波纹型仿生曲面两突起之间间距、台车的牵引速度以及叶片表面垂直载荷为因素，以曲面摩擦系数试验指标进行正交试验，寻求出在一定试验条件下最佳因素水平组合；波纹型仿生曲面突起宽度在本试验条件下对曲面摩擦系数影响显著，而其它几个因素对曲面摩擦系数影响均不显著；通过波纹型仿生曲面突起宽度和台车牵引速度的单因素试验，表明曲面摩擦系数随着仿生曲面突起宽度的增大而减小，而随着台车牵引速度的变化基本保持不变，和正交试验结果保持一致。
Other things, in addition to PTFE has excellent chemical stability and to have their anti-fouling, anti-sticking good, very small and the static Globe Valves friction coefficient is similar to friction lubrication well as valves to Kai, closed parts seals, can reduce the friction between the sealing surface, reducing the valve operating Balance valves torque, improve product service life, in oil, chemical industry, food, pharmaceutical and other industries are widely used.
别外，聚四氟乙烯除了具有优异的化学稳定性外，阻火器其防污、防粘性好、动静摩擦系数值极小且相近，定位器减摩润滑性能良好，将其做为阀门启、闭件的密封副，可降低密封面间的磨擦力，减小阀门操作扭矩，提高产品使用寿命，在石油、印染、化工、食品、医药等工业都有广泛使用。
The simulation methods for calculating dynamic parameters of rod pumping system, such as polished rod dynamometer card, crank shaft torque, motor input power, displacement coefficient and effective power, were systematically improved, and the mathematical models for simulating system efficiency were set up.
摘要应用系统动态参数的计算机仿真方法，对抽油机井悬点示功图、曲柄轴扭矩、电动机输入功率、排量系数、有效功率等动态参数的仿真计算方法进行了改进，建立了系统效率仿真分析的数学模型。
Flexible operation: use of a small friction coefficient and good self-lubrication of the valve seat and stem bearing, greatly reducing the valve operating torque.
操作灵活：采用具有小摩擦系数和良好自润滑性的阀座和阀杆轴承，大大地减少了阀门的操作扭矩。
The optimum design example shows that the variation coefficient of load torque acting on cutting head is decreased 13.9%, and specific energy consumption is lowered 16.9%, which efficiently improves the load characteristic of cutting motor and increases the ratio of energy utilization.
优化设计实例表明，截割头的负载转矩变差系数减小了13.9%，截割比能耗降低了16.9%，有效改善了截割电机的负载特性，提高了能量利用率。
The actual output power and wind energy utilization coefficient can be calculated according to the torque of the blade.
由得出的叶片转矩计算出风轮的实际输出功率及风能利用系数。