| 1. | Neural network based prediction of frictional coefficient in metal forming deep drawing
基于神经网络的板料拉深成形摩擦系数预测 |
| 2. | The results showed that surface of different materials have obvious influence on the frictional coefficient while direction has no significant effect on it
结果表明：摩擦方向对摩擦系数的影响不大，实际生产中主要需考虑摩擦基材面对摩擦系数的影响。 |
| 3. | One of the inequalities is that the initial disturbance amplitude is more than a critical value , and the other is that the frictional coefficient is more than another critical value
初始扰动振幅大于某一临界值； ( 2 )摩擦系数大于某一临界值，前者对后者有很强的约束。 |
| 4. | The established contact model has provided good explanation for the phenomena of the reduction of frictional coefficient induced by longitudinal ultrasonic vibration and has great academic significance in proposing friction reduction technology based on elliptical ultrasonic vibration
对该模型的分析很好地解释了纵向超声振动所引起的摩擦系数降低的现象,为提出利用椭圆轨迹超声振动来实现减摩奠定了理论基础。 |
| 5. | By means of statistical inference as well as hypothesis test method , it is determined that the variables of compressive stress and shearing stress are of extreme - value distribution and that the variables of frictional coefficient and cohesion coefficient are of logarithmic normal distribution
应用统计推理和假设检验方法分析得知，压应力与切应力随机变量呈极值型分布，摩擦系数与粘结力系数随机变量呈对数正态分布。 |
| 6. | Frictional coefficient of paper / al / pe film was measured on different surface and different direction , and the data was analyzed and compared with these different ingredients , thus the frictional coefficient of this new material could be better understood
摘要通过对纸铝塑复合薄膜正反两摩擦基材面相互摩擦及不同角度摩擦的动、静摩擦系数值的测定，比较并分析了不同摩擦基材面和不同摩擦方向对其大小的影响，从而对这种新材料的摩擦系数有了进一步的认识。 |
| 7. | The controllers have considered all sorts of imperceptible factors affecting the servo performances in a lpmsm servo system , which include the parametric uncertainties brought by the changes of the mobile mass , frictional coefficient , the thrust fluctuations aroused by the varieties of the magnetic density distributions and the time harmonic . the h state feedback controller restrains disturbances and uncertainties to keep the robust and stable performance . the ip controller , which has the ability of rapid response , is applied to satisfy the rapid performance
在分析双环控制问题时，针对直线永磁同步电动机，仔细考虑了能使伺服系统性能变坏的各种细微因素，如：永磁同步直线电机动子质量变化、摩擦系数变化等造成的模型参数不确定性，电机运行期间存在磁密分布变化、时间谐波等产生的推力扰动等，采用了ip速度控制器和h _状态反馈控制器相结合构成直线伺服的内环控制器，并辅助设计了外环的pi位置控制器。 |
| 8. | On the basis of utilizing geometric conversion and modification principle of spur and helical gears , the mathematical model for geometric parameters and modification of overlapping coefficients of gear was established , and the calculation method of sliding frictional coefficients under elasto - hydrodynamic lubrication state was introduced , thus let the calculation method of meshing efficiency of gears be more coinciding with the practical application
在运用直、斜齿轮几何换算和变位原理的基础上，建立齿轮的几何参数和重迭系数修正的数学模型，介绍了弹流润清状态滑动摩擦因数的计算方法，从而使齿轮啮合效率计算方法与实际应用更吻合。 |
| 9. | This machine has great feeding ability , easy to be regulated , can be fed with fixed quantity under control of time delay relay ; it is divided into one - way feeding and bidirectional feeding in terms of feeding direction , suspending type and seating type in terms of installation ; in order to assure precision of feeding , roller encapsulation is equipped to increase frictional coefficient between adhesive belt and rollers ; the rectangle discharging mouth has large dimension which can prevent humping up materials ; this machine has close structure , reliable application and can be easily repaired because it has many similar parts with belt type conveyor
该机给料能力大，调节给料量方便，又可在时间继电器的控制下定量给料按给料方向该机可分为单项给料和双向给料，按安装方式又分为吊挂式和座式为了保证给料的精度，主动滚筒包胶，以增加胶带与主动滚筒的摩擦系数料仓矩形卸料口的尺寸大，物料不易起拱该机结构紧凑，使用可靠，它与带式输送机有许多通用部件，故维修方便。 |
