Mechanism Analysis and Simulation of Vibration Harvesting of the Sea Buckthorn Fruit-stalk System

Peng Jun;Sun Shipeng;Feng Yali;Yang Yougang;Fu Longsheng;College of Mechanical and Electronic Engineering,Northwest A&F University;

fruit-stalk;;vibration harvest;;finite element;;model analysis

Sea buckthorn is an ideal plant for ecological management and was thus planted widely in the western of China. Its fruit is rich in nutrition,and has high economic value,but sea buckthorn fruit is very difficult to be harvested. In order to change the situation mainly by manual picking,it is necessary to study the mechanized harvesting of sea buckthorn. In this paper,the mechanism of fruit-stalk detachment by vibration was studied,and a two degree of freedom forced vibration physical model is established and derive the kinetic equation. The steady forced vibration solution and the inertia detachment force of the fruit-stalk system were obtained by solving mathematical differential equations. Meanwhile,the geometric outline of fruit,of fruit is simulated by Bessel's function curve,and the geometric curve equation of the fruit were used to draw the 3D model of the fruit in Pro/E. Afterwards,the fruit model was introduced into the finite element analysis software ANSYS to carry out Modal analysis. The results show that the displacement,velocity and acceleration of the fruit-stalk system were in conformity with the results of finite element simulation analysis. When the frequency is in the range of 18 ~ 46 Hz,the part of the fruit is resonant and the main mode is the largest. This will provide the theoretical basis for the development of the vibration picking equipment for sea buckthorn fruit.