共查询到19条相似文献,搜索用时 51 毫秒
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介绍了XK2125数控龙门镗铣床X轴末级传动装置的选择理由及参数配置,并对在制造过程中需重点解决的问题作了较详细的论述。 相似文献
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通过对主轴箱垂向Y轴行程8 m的数控落地铣镗床使用静压蜗杆、蜗母条传动结构,提高了Y轴的工作精度和使用寿命,解决了有效加工高度大于7 m的矿山机械转筒零件加工难的问题。 相似文献
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王振宇 《机械工人(冷加工)》2006,(7):47-47
我厂生产的MNXD755型数控卧式混联机床,其工作台为数控圆形回转台,它的回转运动由电动机通过同步齿形带一级降速后驱动蜗杆、蜗轮副从而带动工作台的回转。因为该回转工作台的定位精度有较高的要求,这就使蜗杆副的消隙装置变得至关重要了。鉴于该工作台的直径较小,不宜采用传统的双蜗杆消隙方式,我们采用了如附图所示的结构。 相似文献
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介绍XK2125数控龙门镗铣床X轴上采用的静压蜗杆蜗母条副的精度要求和技术条件,并对该传动副装配工艺的 相似文献
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Improving tracking performance of industrial SCARA robots using a new sliding mode control algorithm
Min-Cheol Lee Kwon Son Jang-Myoung Lee 《Journal of Mechanical Science and Technology》1998,12(5):761-772
This paper addresses the implementation of a new sliding mode control algorithm for high speed and high precision tasks, which
is robust against variations in the robot parameters and load. The effects of nonlinear dynamics, which are difficult to model
accurately, become prominent in high speed operations. This paper attempts to treat the nonlinear dynamics of a SCARA robot
as a disturbance. Based upon this approach, a new sliding mode control algorithm is proposed, in which a switching control
input can be obtained easily and is determined to satisfy the existence condition for sliding mode control. A graphic simulator
is used to evaluate the proposed algorithm for a SCARA robot. Simulation results show that the proposed algorithm is robust
against disturbances and can reduce the magnitude of chattering, which is an unavoidable problem in sliding mode control.
Experiments are carried out to validate the simulated results with an industrial SCARA robot using DSPs. 相似文献
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提出一种组合油腔结构的新型偏心静压向心轴承,通过数值计算给出矩形腔、岛式腔和组合腔结构的轴承性能比较,表明新型组合腔结构轴承的承载能力和刚度系数均最高。 相似文献
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本文给出了一种双节距滚子链链轮设计计算新方法,将本方法计算结果与GB5269—85中的设计计算结果进行对比分析,得到满意的结果,说明本方法是有效的。 相似文献
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This paper investigates the stabilization and disturbance rejection for a class of fractional-order nonlinear dynamical systems with mismatched disturbances. To fulfill this purpose a new fractional-order sliding mode control (FOSMC) based on a nonlinear disturbance observer is proposed. In order to design the suitable fractional-order sliding mode controller, a proper switching surface is introduced. Afterward, by using the sliding mode theory and Lyapunov stability theory, a robust fractional-order control law via a nonlinear disturbance observer is proposed to assure the existence of the sliding motion in finite time. The proposed fractional-order sliding mode controller exposes better control performance, ensures fast and robust stability of the closed-loop system, eliminates the disturbances and diminishes the chattering problem. Finally, the effectiveness of the proposed fractional-order controller is depicted via numerical simulation results of practical example and is compared with some other controllers. 相似文献