基于结构声强法的红枣树振动能量传递特性研究OA

Aiming to investigate the energy transfer characteristics and patterns of jujube trees during vibratory harvesting,a visualization analysis method for the structural intensity of jujube trees was proposed.By integrating ANSYS and self-developed Matlab programs,a structural intensity vector field analysis model for jujube trees was established,and the structural intensity vector field of jujube trees under different excitation conditions was solved and visualized.Quantitative analysis based on the vibrational energy flux ratio revealed the following:at low-frequency vibrations(the 1st and 2nd natural frequencies),energy primarily remains in the trunk;as the frequency increases(the 3rd and 4th natural frequencies),energy was uniformly transferred to various structural parts of the jujube tree.Under circular or linear excitation,energy mainly stayed in the trunk,whereas under non-circular or three-dimensional excitation,energy was evenly distributed to all structural parts of the jujube tree.As excitation time increased,the energy transfer path gradually changed,but it stabilized after 3 seconds.The energy transfer efficiency was positively correlated with excitation height.Changes in excitation force did not affect the energy transfer path.For side branches at similar heights,energy transfer efficiency was positively correlated with the cross-sectional area at the connection and the length of the side branch,but negatively correlated with the growth angle.For side branches on the same side,as the height of the side branch increased,energy transfer efficiency was negatively correlated with the cross-sectional area at the connection and the length of the side branch.For side branches with similar growth angles,energy transfer efficiency was positively correlated with the height of the connection point but negatively correlated with the cross-sectional area and the length of the side branch.For side branches of similar length,energy transfer efficiency was positively correlated with the height of the connection point and the growth angle but negatively correlated with the cross-sectional area.Vibration experiments verified that the relative error of the analysis model was within 7.3％,indicating high reliability.