Optimization And Experiment Of Vibration Picking Parameters Based On Canopy Characteristics Analysis Of Camellia Oleifera

At the present stage,camellia oleifera industry has been developed rapidly,camellia oleifera fruit picking has become an urgent issue,mechanised picking mode has become an urgent need for camellia oleifera fruit growers.Mechanized picking of camellia oleifera fruit covers the advantages of improving picking efficiency and easing labor intensity,but improper operation can also cause certain damage,affecting the number of camellia oleifera fruit produced in the next year and other disadvantages.Therefore,in the development of mechanized camellia oleifera fruit picking equipment should follow the concept of “high efficiency and low loss”.With the continuous research of experts and scholars on mechanized picking of camellia oleifera fruits,vibration picking has become the main mechanized picking research direction of camellia oleifera fruits.When the camellia oleifera fruit is picked by vibration again,the shedding of camellia oleifera fruit is not only related to the vibration parameters,but also related to the basic characteristics of the fruit tree itself.Therefore,this paper studies and analyzes the basic traits of camellia oleifera canopy which are related to vibration picking of camellia oleifera fruit,so as to optimize the picking parameters and reduce the damage rate of flower bud while improving the harvest efficiency.Its main research contents are as follows:(1)Camellia oleifera tree scanning and segmentation.In this paper,used VLP-16 Li DAR to scan camellia oleifera trees to obtain its point cloud data,through its preprocessing,single tree segmentation and other steps.To lay the foundation for subsequent measurements,reduces errors and labor consumption arising from manual measurement.(2)Understand the structural characteristics of the camellia oleifera tree and the camellia oleifera fruit.The point cloud data was used as the basis for measuring the basic biological traits of camellia oleifera trees,by studying the distribution of fruit diameter and fruit weight of camellia oleifera fruits,and based on the reliability verification,the valid measurement method of the average diameter as well as the average weight of camellia oleifera fruits was obtained,and the suitable height interval for vibratory picking of camellia oleifera fruits was also found.(3)Modeling different varieties of camellia oleifera trees,in order to analyze the shedding conditions of the camellia oleifera fruit,a mechanical model was established and solved for the camellia oleifera fruit,and after obtaining the theoretical conditions for its shedding,the design of the shedding test in the form of “simulated fruit” and the dynamic test were carried out.The test results and the collected test data were analyzed,it was obtained that the fruits were more vulnerable to damage during the vibration period when the camellia oleifera fruits were picked by vibration.From this,the vibration frequency has an important effect on vibration picking of camellia oleifera fruits.Therefore,modal analysis was carried out separately after modeling.Through the modal analysis,it was found that they have a common inherent frequency range,so that the most suitable frequency range for vibration picking camellia oleifera fruits should be selected between 6and 12 Hz.(4)Based on the research content of this paper and the single-factor test,the frequency,height and time range of suitable vibration picking were selected,and the orthogonal experimental scheme was designed with these three as the test factors.The harvesting rate of camellia oleifera fruits and the damage rate of flower buds were used as evaluation indexes,carry out orthogonal test protocol design.In this way,the regression model was obtained,and then correlation analysis was performed to derive the best vibration harvesting parameters suitable for the conventional height oil tea trees in the base.It was verified by field tests and found that when the vibration time was 11 s,the vibration height was 138 cm and the vibration frequency was 8Hz,the harvest rate of camellia oleifera fruits was 92.78% and the damage rate of flower buds was 10.27%,this parameter can provide some reference for the subsequent vibration harvesting of camellia oleifera trees.