Kinematic Error Analysis and Test of High-speed Plug Seeding Transplanting Machine for Greenhouse Based on Parallel Mechanism

YANG Qizhi, SUN Mengtao, CAI Jing, SHI Xinyi, MAO Hanping, GU Jun

Abstract

The greenhouse plug seedlings transplanting machines applied to industry are mostly with three-dimensional gantry structure. There are some obvious shortcomings like large size and inertia, low relatively rigidity, high prices and poor flexibility in operating capacity and not suitable for filling the gaps with seedlings or rejecting seedlings in high-speed operation. In view of these problems, it was intended to design a transplanting machine system with main body of parallel mechanism. The main structure of parallel transplanter and its five kinds of end effector of matching design were introduced. And then the quality of these end effectors was calculated. First of all, the rigid-flexible coupling multi-body dynamics model of parallel mechanism was established in ADAMS. Secondly, a longest diagonal trajectory was picked for simulation, and the error between the theoretical trajectory of the rigid model and the actual trajectory of the flexible model was compared. And then, the influence of changes of mass to motion error was set and explored by rigid-flexible coupling multi-body dynamics simulation in ADAMS and the feasibility of the parallel design was verified. It was found that there was oscillation at the end of the transplanting track. Finally, the positioning accuracy was tested by the physical prototype. Position error of the moving platform to each point was counted and the control system was compensated. It was turned out that the average positioning error was reduced from 7.611mm to 1.208mm. And most of the errors were systematic errors. During working process, the transplanting machine was with low deformation and high accuracy in taking and delivering stage during acceleration peak was 20m/s2 and average speed was 2m/s. But when the average speed was 3m/s and the acceleration peak was 30m/s2, the error was increased and the radial support force needed to be improved.


Keywords: greenhouse, plug seeding, parallel mechanism, transplanting machine, motion error, experiment

 

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YU Xiaoxu, ZHAO Yun, CHEN Baocheng, et al. Current situation and prospect of trans planter [ J/OL ]. Transactions of the Chinese Society for Agricultural Machinery ,2014 ,45 ( 8 ) :44 -53. (in Chinese)

http: //www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? file_no = 2013s 101 &flag = 1. DOI: 10. 6041/j. issn. 1000-1298. 2013. SI.001.

JIN Xin,LI Shujun,YANG Xuejun, et al. Analysis and parameter optimization for vegetable plug seedling pick-up mechanism [J/ OL] . Transactions of the Chinese Society for Agricultural Machinery ,2013 ,44 ( Supp. 1) ;1 -6,13. (in Chinese)

RYU К II, KIM G, HAN J S. Development of a robotic transplanter for bedding plants [ J]. Journal of Agricultural Engineering Research, 2001, 78(2) : 141 -146.

CHOI W C, KIM D C, RYU 11 L, et al. Development of a seedling pick-up device for vegetable transplanters [J]. Transactions of the ASAE, 2002, 45( 1 ) : 13 - 19.

TONG Junhua, JIANG Huanyu, LIU Van, et al. Advance on application of seedling transplantion robot for bedding plants in facility agricalture [ С ] //2012 International Academic Annual Meeting of China Agricultural Machinery Society, 2012: 10 - 16. (in Chinese)

CU1 Wei. Research on dry land automatic trans-planter for plug seedling I)]. Beijing; China Agricultural University, 2015. (in Chinese)

JIANG Huanyu, Sill Jinghui, REN Ye, et al. Application of machine vision on automatic seedling transplanting[ J ]. Transactions of the CSAE,2009,25(5) : 127 - 131. (in Chinese)

91 Chunhui, HU Jianping, MA Jun, et al. Solving motion law by numerical simulation on bowl seeding transplanting robot[C]/y IFIP Advances in Information and Communication Technology 370, Proceedings of 5th International Conference on Computer and Computing Technology in Agriculture,2012; 103 - 1 1 1.

LIAO Qingxi, LIU Mingfeng, ZHANG Zhao, et al. Multi-objective optimization design of double five-bar transplanting mechanism for rape pot seedling [J/OL]. Transactions of the Chinese Society for Agricultural Machinery ,2015 ,46( 1 1 ) ;49 - 56. ( in Chinese)

CHEN Genliang, WANG Hao, LIN Zhongqin. Generalized kinematic mapping of constrained plane motions and its application to the accuracy analysis of general planar parallel robots[J]. Mechanism and Machine Theory, 2012, 50: 29 -47.

KORAYEM M H, YOUSEFZADEH M, MANTEGHI S. Dynamics and input-output feedback linearization control of a wheeled mobile cable-driven parallel robot [J]. Multibody System Dynamics, 2017,40( 1 ) ;55 -73.

LI Shujun, YANG Xuejun, YAN llua, et al. Kinematic analysis and performance experiment of cam-swing link planting mechanism[ J ]. Transactions of the CSAE,2016, 32(6) :34 -41.

http://www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? file_no = 20161051 &flag = 1. DOI; 10. 6041/j. issn. 1000-1298. 2016.10.051. YANG Jidong, WAN Biaogang, GAO Jundong, et al. Kinematic analysis and experiment of Tripod parallel robot [J/OL]. Transactions of the Chinese Society for Agricultural Machinery, 2016,47( 10) : 390 -397. ( in Chinese)

http;// www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? file_no = 20140708&flag = 1. DOI: 10. 604I/j. issn. 1000- 1298.2014.07.008. LIU Jizhan,LIU Wei,MAO Hanping,et al. Design and coordinated motion simulation of transplanting robot for column cultivation [ J/OL]. Transactions of the Chinese Society for Agricultural Machinery ,2014 ,45 ( 7 ) ;48 -53. ( in Chinese)

PORTMAN V T, CIIAPSKY V S, SHNEOK Y. Workspace of parallel kinematics machines with minimum stiffness limits; Collinear stiffness value based approach [J]. Mechanism and Machine Theory, 2012, 49; 67 -86.

LI Tiemin, J1A Shi,WU Jun. Dynamic model of a 3-DOF redundantly actuated parallel manipulator [J ]. International Journal of Advanced Robotic Systems,2016,13(5) :1 - 12.

HU Jianping, JIN Ileqi, CHANG Yanchao, et al. Dimensional synthesis and trajectory planning of plug seedling transplanting robot based on Delta parallel mechanism[ J/OL] . Transactions of the Chinese Society for Agricultural Machinery ,2017 ,48( 5) ;28 -35.( in Chinese)

http://www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? file_no = 2016s023&flag = 1. DOI; 10. 6041/j. issn. 1000-1298. 2016. SO.023. HU Jianping, ZHANG Chendi, WANG Liuzhu,et al. Design and experiment on automatic greenhouse seedling transplanting machine[ J/OL]. Transactions of the Chinese Society for Agricultural Machinery ,2016,47 ( Supp. ) ;149 - 154. (in Chinese)

XIE Fugui, LIU Xinjun,YOU Zheng, et al. Type synthesis of 2T1 К-type parallel kinematic mechanisms and the application in manufacturing [J]. Robotics and Computer-Integrated Manufacturing, 2014, 30( 1 ) ;1 - 10.

PARTHAJ1T M, BHASKAR D, MALLIK A K. Dynamic stability index and vibration analysis of a flexible Stewart platform [J ] Journal of Sound and Vibration, 2007, 307; 495 -512.

HAN Liihua,MAO HanpingJIU Jianping,et al. Design and test of combined pick-up device for automatic and precise transplanting of vegetable plug seedlings[ J] . Transactions of the CSAE, 2015 ,31 ( 1 ) ; 17 - 23.


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