Collisionless tool orientation smoothing above blade stream surface using NURBS envelope

Xu, Jinghua; Zhang, Shuyou; Sa, Rina

doi:10.1631/jzus.a1200160

Cited by 5 publications

(3 citation statements)

References 36 publications

(33 reference statements)

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“…AIM is an area-based method that generates gouge-free tool positions without the use of iterative gouge-check and correction algorithms. Xu et al 14 presented a tool orientation smoothing method based on the non-uniform rational basis spline (NURBS) envelope. In this method, tool orientation is adjusted by evaluating the intersection of the NURBS envelope so that no collision occurs during machining.…”

Section: Introductionmentioning

confidence: 99%

Collision-free planning algorithm of motion path for the robot belt grinding system

Jiewen

2018

International Journal of Advanced Robotic Systems

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Collision may occur during the grinding of a workpiece by a robot sand belt. To solve this problem, a collision-free planning algorithm for the robot motion path is developed based on the collision layer method. Collision-free planning of the robot motion path is studied, and a means to adjust the machining frame on the belt is determined (i.e. moving along the axis of the belt and rotating around the tangent line). The planning curve is rapidly found on the collision layer using neighborhood search and recursive methods, and the amount of collision detection is significantly reduced. The planning curve is transformed into the robot motion path. Simulation and experimentation show that the amount of collision detection required by the proposed algorithm is 3.86% less than that required by a method using a complete collision layer. Moreover, the robot grinds the workpiece without collision. The proposed method is simple, stable, and easy to implement and possesses a good engineering application value.

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Section: Introductionmentioning

confidence: 99%

Collision-free planning algorithm of motion path for the robot belt grinding system

Jiewen

2018

International Journal of Advanced Robotic Systems

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“…The difficulty of multi-actuated mechanism design lies in the electromechanical coupling found in different actuating processes based on our previous work in performance design (Xu et al, 2013a;2013b). To study this phenomenon, we proposed a multi-actuated mechanism design method considering structure flexibility using correlated performance reinforcing.…”

Section: Introductionmentioning

confidence: 99%

Multi-actuated mechanism design considering structure flexibility using correlated performance reinforcing

Zhang

Zhao

2015

JZUS-A

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Multi-actuated rigid-flexible dynamic system exists widely in precision machinery and electrical control fields. The performances, such as kinematic, dynamic, electrical, magnetic, and thermal performances, are correlated and difficult to trap precisely. Therefore, a multi-actuated mechanism design method considering structure flexibility using correlated performance reinforcing is put forward. A system containing flexible subparts with multi degrees of freedom (DOF) with physical coordinate is converted into modal coordinate using 'DOF×modal order' square matrix. The structure flexibility is described by modal superposition of the shape mode which is considered as additional generalized coordinates. A dynamic equation with large DOF is formulated and reduced based on Craig-Bampton modal truncation. Using analogical design methodology with and without structure flexibility of the low voltage circuit breaker (LVCB), the extent of the performance impact of each subpart is obtained by calculating correlated Holm force, Lorentz force, electrodynamic repulsion force, electromagnetic force, and cantilevered bimetallic strip force. Design of experiments method is employed to reveal the hard-measuring properties using correlated relatively easy-measuring parameters. The trip mechanism is validated by an electrical performance experiment. results show that the structure flexibility can decrease the tripping velocity, which is non-negligible, especially for high frequency tripping. The method provides a reference significance for similar multi-actuated mechanism design.

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“…Furthermore, geometric properties such as normal vectors, curvatures, and geodesic curves in discrete models are calculated approximately. Analytical surfaces, such as tensor-product non-uniform rational B-splines (NURBS) (Xu et al, 2013), have become the de facto industry standard in computer-aided design (CAD) and computer-aided manufacturing (CAM). Nevertheless, due to the nature of the tensor-product, multiple trimmed NURBS patches (Sarkar and Dey, 2013;Zhu et al, 2013) should be used to represent the complex shapes of artificial bones.…”

Section: Introductionmentioning

confidence: 99%

A morphing machining strategy for artificial bone

Gan

Shen

et al. 2014

J. Zheijang Univ.-Sci.

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Abstract:In this work, a novel morphing machining strategy (MMS) is proposed. In the method, the workpiece is progressively carved out from the stock. Pitfalls in conventional iso-height strategy, such as sharp edges and unevenly distributed left-over materials, are overcome. Moreover, to calculate different levels in the MMS, an energy-based morphing algorithm is proposed. Finally, the proposed strategy is employed in the machining of artificial bone represented by a T-spline surface. The excellent properties of T-spline, such as expressing complex shapes with a single surface, have been well adopted to artificial bone fabrication. Computer simulation and the actual machining of the middle finger bone show the feasibility of the proposed strategy.

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Collisionless tool orientation smoothing above blade stream surface using NURBS envelope

Cited by 5 publications

References 36 publications

Collision-free planning algorithm of motion path for the robot belt grinding system

Collision-free planning algorithm of motion path for the robot belt grinding system

Multi-actuated mechanism design considering structure flexibility using correlated performance reinforcing

A morphing machining strategy for artificial bone

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