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1、Vol. 24 No. 2
Feb. 2018
第24卷第2期
2 0 1 8年2月
、 計算機集成制造系統(tǒng)
Computer Integrated Manufacturing Systems
DOI: 10. 13196/j. cims. 2018. 01. 014
剛柔混聯(lián)的草莓采摘機械手結構設計與動力學分析
王家忠,張建寶,弋景剛
(河北農業(yè)大學 機電丄程學院?河北 保定071001)
摘 要:針對英莓形狀不規(guī)則.組織嬌嫩?容易受機械損傷?難以實現(xiàn)高效低損的機械化采摘作業(yè)的問 題,提岀一種剛柔混聯(lián)的機械手結構。為了建立柔順偽剛體模型,將柔順構件等效為具有欠驅動關節(jié)
2、的多剛 體串聯(lián)系統(tǒng);采用影響系數(shù)法建立柔順構件等效多剛體系統(tǒng)的動力學模型,對機械手柔性構件的動力學特性 進行仿真分析與樣機試驗研究。仿真和試驗結果表明?采用力反饋的剛柔混聯(lián)機構具有良好的包絡性、可控 性、平穩(wěn)性及速度特性,適合于草菴的柔順抓取控制,該成果可為草莓等果蔬無損采摘機械手的設計及優(yōu)化 提供借鑒和參考。
關鍵詞:草莓采摘;機械手;剛柔混聯(lián);動力學分析;柔順控制
中圖分類號:TH113;TP241. 3;TH122 文獻標識碼:A
Structure design and dynamic characteristic analysis for strawberry picking
3、manipulator
WANG J iazhong« ZHANG Jianbao« YI Jinggang
(College of Mechanical and Electrical Engineering, Agricultural University of Hebei. Baoding 07100L China) Abstract: Aiming at the problem that strawberry was difficult to realize mechanical picking because of high water content and
4、delicate structure, a rigid flexible hybrid structure of manipulator was proposed for ridge culture. To build the pseudo rigid body model, the compliant component was taken as the multi-rigid body series system of under-actuated joint. The dynamic model of compliant component equivalent rigid body w
5、as constructed with influence coefficient method, and the simulation analysis and experimental research for dynamic characteristics of distributed compliant mechanism were carried out. The simulation result showed that the r.gid flexible mixed connection mechanism with force feedback had good envelo
6、pe? controllability, stability and speed characteristic, and was suitable for compliant picking of strawberry. The research on the separating device had important application value for design and optimization of strawberry and other fruits and vegetables.
Keywords: strawberry picking; manipulator;
7、rigid flexible hybrid structure; dynamics analysis; compliance control
0引言
草莓素有“水果皇后”之美譽,其甜酸適宜、芳香 宜人、營養(yǎng)豐富,然而由于草莓含水量高、組織嬌嫩, 容易受機械損傷,導致其品質急劇下降、貯藏期縮 短;另外,草莓植株矮?。▔抛鞑葺旮咭话銥?0 cm?30 cm),作業(yè)環(huán)境復雜,其采摘過程中的避障
和低損傷成為自動化采摘的關鍵環(huán)節(jié)因此,口 前草莓采摘作業(yè)仍以人工為主,難以實現(xiàn)機械化采 摘作業(yè)。
為了實現(xiàn)草莓的自動化采摘,國內外學者做 了大量研究,大部分工作集中在研發(fā)草儺采摘機 器人,其重點和難
8、點是機械手,即末端執(zhí)行器的研 發(fā)LT)。目前,美國Harvest CROO公司、西班牙
Vol. 24 No. 2
Feb. 2018
Vol. 24 No. 2
Feb. 2018
收稿日期:2017-05-03;修訂日期:2017-08-16. Received 03 May 2017accepted 16 Aug. 2017.
基金項目:國家口然基金資助項0(51305125);河北省高等學??茖W技術研究基金資助項目(YQ2013007). Foundation items:Project suppor- ted by the National Natural Science Foundation? China(No. 51305125). and the 55cicr.cc & Technology Program of Hebei Higher Education Institutionst China(Na YQ2013007).