Abstract
It is well known that the traditional Grübler-Kutzbach formula fails to calculate the mobility of some classical mechanisms or many modern parallel robots, and this situation seriously hampers mechanical innovation. To seek an efficient and universal method for mobility calculation has been a heated topic in the sphere of mechanism. The modified Grübler-Kutzbach criterion proposed by us achieved success in calculating the mobility of a lot of highly complicated mechanisms, especially the mobility of all recent parallel mechanisms listed by Gogu, and the Bennett mechanism known for its particular difficulty. With wide applications of the criterion, a systematic methodology has recently formed. This paper systematically presents the methodology based on the screw theory for the first time and analyzes six representative puzzling mechanisms. In addition, the methodology is convenient for judgment of the instantaneous or full-cycle mobility, and has become an effective and general method of great scientific value and practical significance. In the first half, this paper introduces the basic screw theory, then it presents the effective methodology formed within this decade. The second half of this paper presents how to apply the methodology by analyzing the mobility of several puzzling mechanisms. Finally, this paper contrasts and analyzes some different methods and interprets the essential reason for validity of our methodology.
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Supported by the National Natural Science Foundation of China (Gratn Nos. 50875227, 50575197)
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Huang, Z., Liu, J. & Zeng, D. A general methodology for mobility analysis of mechanisms based on constraint screw theory. Sci. China Ser. E-Technol. Sci. 52, 1337–1347 (2009). https://doi.org/10.1007/s11431-008-0219-1
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DOI: https://doi.org/10.1007/s11431-008-0219-1