Accuracy of the parallel reset mechanism in a wind tunnel balance calibration system

doi:10.16511/j.cnki.qhdxxb.2018.25.011

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Abstract A 6-DOF (degree of freedom) parallel machine was used as the reset mechanism in a wind tunnel balance calibration system because of its simple structure and stiffness. A model was developed using the D-H (Denavit-Hartenberg) convention to analyze inaccuracies in the reset mechanism caused by joint manufacturing tolerances. In this model, each closed-loop kinematic chain was treated as a RRRPRR chain. The effects of the joint tolerances and structural parameters on the kinematic accuracy were calculated based on Qusai-Newton method. Simulations indicate that the inaccuracy is on the same order of magnitude as the joint offsets. A principle is given to determine the structural parameters needed to improve the accuracy of this type of reset system.

Keywords wind tunnel balance reset mechanism accuracy analysis joint tolerances

ZTFLH:

TH13.2

Issue Date: 15 March 2018

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	GUAN Liwen
	CHEN Huang
	FU Meng

Cite this article:

GUAN Liwen,CHEN Huang,FU Meng. Accuracy of the parallel reset mechanism in a wind tunnel balance calibration system[J]. Journal of Tsinghua University(Science and Technology), 2018, 58(3): 298-304.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2018.25.011 OR http://jst.tsinghuajournals.com/EN/Y2018/V58/I3/298

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