The sugarcane field excitation,cutting forces and the engine excitation constitute complicated excitations acting on sugarcane harvesters.In this study,the sugarcane cutting mechanism under complicated excitations was...The sugarcane field excitation,cutting forces and the engine excitation constitute complicated excitations acting on sugarcane harvesters.In this study,the sugarcane cutting mechanism under complicated excitations was analyzed.The dynamics and the mathematical models of sugarcane harvesters were established and simulated.Based on theoretical analysis,sugarcane cutting experiments were done on a self-built sugarcane harvester test platform(SHTP),designed as single-factor and the orthogonal experiments.Effects of the sugarcane field excitation characterized by the sugarcane field excitation device(SFED)output frequency,the engine excitation characterized by the actuating engine output frequency,the cutter rotating speed,the sugarcane harvester travelling speed simulated through the sugarcane transporting speed of the SHTP and the cutter inclination angle on the cutting quality of sugarcane harvesters were studied.Effects of the axial cutter vibration on three-directional cutting forces and the sugarcane cutting quality(SCQ)as well as effects of three-directional cutting forces on the SCQ were further studied.It is shown that the sugarcane field excitation,the axial cutter vibration amplitude and frequency as well as the three-directional cutting forces have significantly negative monotonic correlated effects on the SCQ while the cutter rotating speed,the sugarcane harvester travelling speed and the cutter inclination angle have significantly positive monotonic correlated effects on the SCQ.Significance levels of effects on three-directional cutting forces and the SCQ form high to low are as follow,the axial cutter vibration,the sugarcane field excitation,the cutter rotating speed,the engine excitation,the cutter inclination angle,the sugarcane harvester travelling speed.The theoretical analysis results were verified through experiment and an optimal combination was obtained with the cutter rotating speed of 700 r/min,sugarcane harvester travelling speed of 0.6 m/s and cutter inclination angle of 8º.This study can provide a reference for setting cutting parameters of sugarcane harvesters with a good SCQ.展开更多
The preservation effects of 9 kinds of preservatives were discussed in this paper. And their effects on ornamental quality of cut Ranunculus asiaticus were in-vestigated. The results showed arranging cut Ranunculus as...The preservation effects of 9 kinds of preservatives were discussed in this paper. And their effects on ornamental quality of cut Ranunculus asiaticus were in-vestigated. The results showed arranging cut Ranunculus asiaticus in a vase fil ed with 200 mg/L 8-HQC＋1% sucrose＋75 mg/L AgNO3 would effectively slow down the weight loss, promote the rise of flower diameter, prolong life and maintain the chlorophyl and anthocyanin content of cut flower. The preservative had a good fresh-keeping effect and was suitable for promotion in actual production.展开更多
基金supported by the Middle-aged and Young Teachers'Basic Scientific Research Ability Promotion Project of Guangxi Universities,China(Grant No.2023KY0701)Wuzhou University Research Foundation for Advanced Talents,China(Grant No.WZUQDJJ17195)+13 种基金Key University-level Scientific Research Project of Wuzhou University,China(Grant No.2020B003)Middle-aged and Young Teachers'Basic Scientific Research Ability Promotion Project of Guangxi Universities,China(Grant No.2024KY0697)Wuzhou University Research Foundation for Advanced Talents,China(Grant No.WZUQDJJ17179)Major Special Project of Guangxi Sugarcane Science and Technology in the 14th Five-year Plan,China(Grant No.2022AA01010)the general program of the National Natural Science Foundation Project,China(Grant No.32071916)a horizontal technical service project of the Zhenkang Professor Workstation,Yunnan,Chinathe Double First-class Discipline Construction Project:Mechanized sugarcane harvesting equipment development of Zhenkang,Yunnan,Chinathe first universitydirectlyunder-Education-Ministry-served innovative rural revitalization test project:the China-Agricultural-University-served innovative Bangdong Village revitalization test plan,mechanizedsugarcaneharvesting assistant rural revitalization in hilly areas,Zhenkang,Yunnan,Chinathe Portable Sugarcane Harvester Research and Development,China(Grant No.NK2022160504)the 2115 Talent Development Program of China Agricultural UniversityGuangxi Science and Technology Project,China(Grant No.Guike AA22117007)Guangxi Science and Technology Project,China(Grant No.Guike AA22117005)Guangxi Special Project of Science Technology Bases and Talents,China(Grant No.Guike AD23026033)the Opening Project of Guangxi Key Laboratory of Advanced Microwave Manufacturing Technology,China(Grant No.2024GKLAMMTKFKT001).
文摘The sugarcane field excitation,cutting forces and the engine excitation constitute complicated excitations acting on sugarcane harvesters.In this study,the sugarcane cutting mechanism under complicated excitations was analyzed.The dynamics and the mathematical models of sugarcane harvesters were established and simulated.Based on theoretical analysis,sugarcane cutting experiments were done on a self-built sugarcane harvester test platform(SHTP),designed as single-factor and the orthogonal experiments.Effects of the sugarcane field excitation characterized by the sugarcane field excitation device(SFED)output frequency,the engine excitation characterized by the actuating engine output frequency,the cutter rotating speed,the sugarcane harvester travelling speed simulated through the sugarcane transporting speed of the SHTP and the cutter inclination angle on the cutting quality of sugarcane harvesters were studied.Effects of the axial cutter vibration on three-directional cutting forces and the sugarcane cutting quality(SCQ)as well as effects of three-directional cutting forces on the SCQ were further studied.It is shown that the sugarcane field excitation,the axial cutter vibration amplitude and frequency as well as the three-directional cutting forces have significantly negative monotonic correlated effects on the SCQ while the cutter rotating speed,the sugarcane harvester travelling speed and the cutter inclination angle have significantly positive monotonic correlated effects on the SCQ.Significance levels of effects on three-directional cutting forces and the SCQ form high to low are as follow,the axial cutter vibration,the sugarcane field excitation,the cutter rotating speed,the engine excitation,the cutter inclination angle,the sugarcane harvester travelling speed.The theoretical analysis results were verified through experiment and an optimal combination was obtained with the cutter rotating speed of 700 r/min,sugarcane harvester travelling speed of 0.6 m/s and cutter inclination angle of 8º.This study can provide a reference for setting cutting parameters of sugarcane harvesters with a good SCQ.
基金Supported by Jiangsu Province 333 High-level Personnel Training Project~~
文摘The preservation effects of 9 kinds of preservatives were discussed in this paper. And their effects on ornamental quality of cut Ranunculus asiaticus were in-vestigated. The results showed arranging cut Ranunculus asiaticus in a vase fil ed with 200 mg/L 8-HQC＋1% sucrose＋75 mg/L AgNO3 would effectively slow down the weight loss, promote the rise of flower diameter, prolong life and maintain the chlorophyl and anthocyanin content of cut flower. The preservative had a good fresh-keeping effect and was suitable for promotion in actual production.
