But from abroad in the use of the airport runway friction coefficient test purchase of vehicles demarcation device error is found, it is impossible to guarantee the next instrument. 但在使用从国外购买的机场跑道摩擦系数测试车过程中发现标定装置误差太大,根本无法保证接下来的测量。
Results show that instantaneous friction coefficient does not keep constant even under steady exterior micro-load due to tribo-structure and manufacture error, and it varies with operation condition such as type of lubricants, rotation speed of shaft, exterior load and oil starvation state. 结果表明,含油轴承在稳定微载荷状态下的瞬态摩擦系数不固定,且随着润滑剂、轴承转速、径向载荷与混合润滑状态等因素而变化。
A new type of cylindrical surface envelope globoidal worm gearing with rolling friction and point engagement, is presented. The mathematic model of high-pair mechanism about its location error and variation relationship is also given. 提出了新型滚动式圆柱面包络点啮合环面蜗杆副的高副机构传动原理,建立了此类机构误差与变异关系的数学模型,据此分析了机构对各类误差的敏度及其适应性问题;
Finally, it is found out that joint friction and eccentricity of hooke joint is the primary factor influence on error. Precision can be improved by error compensating and by use of spherical joint. 最后,进行了外科手术机器人主要机构的运动精度分析,运动副的摩擦和虎克铰偏心都会引起较大的平台运动轨迹误差,并提出了误差补偿和改用球铰的方法,可以大大提高运动精度。
A friction and wear tester with high current and its online testing system is introduced in this paper. The methods of signal-acquisition, A/ D conversion and measure error processing is also presented. 本文介绍了自行设计的强电流摩擦磨损试验机及其实时在线检测系统,主要包括试验中各参量信号的获取,A/D转换,以及对测量数据误差的软件处理方法。
Next, in ADAMS, friction coefficient database is set up, and dialog box for defining joint friction is extended based on analyzing joint friction in mechanical system, and the method of parametric analysis is discussed for analyzing manufacture error's influence on mechanism performance. 接着,全面分析了机械系统运动副摩擦,结合ADAMS系统的功能,创建了该系统的摩擦系数库,扩充了运动副摩擦参数定义对话框,讨论了ADAMS的参数化分析方法。
The phenomena such as low speed friction, system steady-state error, limit cycle oscillation, and static-slip caused by the frictions exists in gun control system of tanks. 坦克炮控系统存在低速摩擦,摩擦环节不但造成系统的稳态误差,而且导致极限环振荡、低速爬行等现象。
The on-line measurement of the friction force resulted from billet drawing in continuous casting mould has been investigated through measuring power of mould oscillation motor and its principle and error are analysed. 提出通过振动电机功率监测结晶器内拉坯阻力的方法&功率法,对其原理和误差进行了分析。
A robust nonlinear control design is presented. By introducing the nonlinear gain and friction compensation term, the robust global convergence of the tracking error is proved using Lyapunov ′ s direct method. S_n ∈ L_1, then S_n converges almost surely. 对含非线性摩擦环节的机械伺服系统,提出一种基于Lyapunov方法的鲁棒非线性控制方法,通过引入非线性增益和摩擦补偿项,来克服参数不确定性和补偿非线性摩擦,从而保证跟踪误差渐进收敛。
A novel friction compensator based on adaptive fuzzy logic systems is employed, and a bound on the tracking error is derived from the analysis of the tracking error dynamics. 在系统证明上,从李雅普诺夫函数中导出了自适应参数并且分析了闭环系统跟踪误差的有界性。
The dynamic friction compensation based on the error and change in error measurements can significantly improve the position precision in a broad range of the changes of load torque. 基于误差和误差变化的动态摩擦补偿,在负载扭矩大范围变化的条件下均获得了高精度的定位控制。
Relevant Analysis between Friction Torque Technical error& Lubrication for Miniature Bearings 微型轴承摩擦力矩与工艺误差及润滑的相关性分析
The experiment research on friction moment dynamic error of rolling bearing 滚动轴承摩擦力矩动态误差的实验研究
In this paper, The measure and control system of axial automatic collimating for friction jointing machine is introduced. A kind of laser ranging is designed. It decreases the error caused by part of lack of old drill pipe. 针对焊接钻杆过程开发的自动对中检测和控制系统,设计了一种激光测距方法,减少了因旧钻杆局部缺损引起的误差。
However, For pipes with local resistance loss, the friction head loss caused by the viscosity of fluid does exist, which may lead to the calculation error. 但是在形成局部阻力损失的管段中,还会同时伴随产生由于液体的粘性力引起的漩程水头损失,这就造成了这项损失的计算误差。
Research showed that the non-linear friction and tracking error were two main obstacles to improve the performance of servo. 研究表明,非线性摩擦和跟踪滞后是影响它们性能提高的两大主要障碍。
However, the presence of friction in servo system results in the steady-state error, crawls, and limits cycle oscillation, and seriously impact on improvement performance of turntable. 转台伺服系统中摩擦环节的存在容易导致系统出现稳态误差、爬行、极限环振荡等现象,严重影响了转台性能的提高。
This thesis poses a thorough investigation on the influence of servo parameter, loading inertia, cutting force and friction to servo system and tries to put them into the consideration of control error. 本文主要针对伺服参数、负载惯量、切削力及摩擦力对伺服控制系统的影响做了深入研究,并将其纳入轮廓误差控制之中。
Friction may cause bad performance of control system, which embody phenomenon such as the position error, limit cycle, stick-slip etc. So it is an obstacle to improve the kinematic control accuracy. 摩擦环节对伺服控制系统性能造成的不良影响,主要体现在能够引起位置误差、极限环、爬行等现象的发生,这是提高运动控制精度的一个障碍。
Roundness error affects the components on such aspects, the precision, accuracy of rotation, friction, vibration, noise and so on; thereby roundness error will cause their loss of life. 圆度误差的存在直接影响着零部件的配合精度、旋转精度、摩擦、振动、噪声等,因而降低了他们的使用寿命。
The step friction torque is the main source for the stabilization error. 这种干扰力矩是对稳定误差影响最大的因素。
As the heat generated by friction between bearing and lead screw nut will result in the temperature increase of the leading screw and thereby deformation of bass screw, thermal error must not be disregarded. 由于轴承、丝杠螺母等部件在工作时摩擦生热,会引起丝杠温度的上升,从而导致滚珠丝杠受热变形,造成不可忽略的热误差。