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¡¡¡¡¹Ø¼ü´Ê£ºÁù×ã»úÆ÷ÈË£»²¢Áª»úеÍÈ£»½âñî»ú¹¹£»ÐÔÄÜÆÀ¼ÛÖ¸±ê£»ÓÅ»¯Éè¼Æ£»ÊÔÑéÑù»ú

Abstract

¡¡¡¡At present, hexapod robot is one of the hot topics in the field of robot. The existinghexapod robots are generally designed with 6 serial mechanical legs on there trunks.Hexapod robots with this kind of structure are very thin and fragile to ensure that theirstructures are compact. Or their volumes are very large to ensure that they have greatbearing capacity. In this paper, parallel mechanisms have been applied to the mechanicallegs of hexapod robots, so deficiencies of serial mechanical legs can be improved. Parallelmechanical legs can make hexapod robots have great bearing capacities and movementflexibilities, and they also have compact structures. This can improve the environmentadaptability and practicability of hexapod robots.

¡¡¡¡The hexapod robot's overall configuration has been analyzed in this paper, so thenumber and type of mechanical leg's degree of freedom has been determined. Mechanicallegs are pided into two classes: point contact and surface contact, based on the contactforms between foots and ground. The screw theory has been used for configurationanalysis, 2-UPS+UP parallel mechanism was chosen as the initial mechanism,£¨U+UPR£©P+UPS parallel mechanism was obtained as the final mechanism for the pointcontact mechanical leg by decoupling optimized. And then 3-UPS parallel mechanism waschosen as the initial mechanism, 2-UPS+UPU parallel mechanism was obtained as thefinal mechanism for the surface contact mechanical leg by decoupling optimized.

¡¡¡¡The position negative solutions formulas of £¨U+UPR£©P+UPS parallel mechanismhave been established. The kinematics, statics and dynamics of £¨U+UPR£©P+UPS parallelmechanism have been analyzed, and the mechanisms performances of £¨U+UPR£©P+UPSparallel mechanism have been evaluated by defining the performance evaluation indexes.Relations between structural parameters and performance evaluation indexes have beenrevealed. An excellent set of structural parameters have been found by Monte Carlomethod. A new kind of 3-DOF parallel mechanical leg has been designed based on£¨U+UPR£©P+UPS parallel mechanism. The error model and sensitivity of £¨U+UPS£©P+UPSparallel mechanism £¨it has the same topological structure with £¨U+UPR£©P+UPS parallel mechanism£© have been analyzed, considering the error tolerance and technological factors.

¡¡¡¡The position negative solutions formulas of 2-UPS+UPU parallel mechanism havebeen established. The kinematics, statics and dynamics of 2-UPS+UPU parallelmechanism have been analyzed, and the mechanisms performances of 2-UPS+UPUparallel mechanism have been evaluated by defining the performance evaluation indexes.Relations between structural parameters and performance evaluation indexes have beenrevealed. An excellent set of structural parameters have been found by Monte Carlomethod. A new kind of 5-DOF parallel mechanical leg has been designed based on2-UPS+UPU parallel mechanism.

¡¡¡¡The virtual prototype of a new kind of hexapod robot with decoupling structure hasbeen designed based on the £¨U+UPS£©P+UPS parallel mechanism leg. The instantaneousequivalent parallel mechanism of the hexapod robot with £¨U+UPS£©P+UPS parallelmechanism legs was obtained, and its kinematics has been analyzed. The gait planning ofthe hexapod robot with £¨U+UPS£©P+UPS parallel mechanism legs has been analyzed bydouble-triangle gait, and its motion simulation has been done. The curves of driveparameters have been obtained.A new kind of hexapod robot's experimental prototype with 2-UPS+UP parallelmechanism legs has been designed. Considering the mechanical manufacturing process,the experimental prototype was manufactured. The concept of hexapod robot with parallelmechanism legs has been validated. These findings extend the application fields ofhexapod robot.

¡¡¡¡Keywords: hexapod robot; parallel mechanical leg; decoupling mechanism; performance evaluation index; structural optimization design; experimental prototype

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