Design And Analysis Of Multi Degree Of Freedom Wave Energy Power Generation Device

In this paper,the mechanical configuration design,kinematic response model,dynamic response model and performance evaluation of multi degree of freedom wave power generation device are studied while considering the characteristics of ocean wave motion and the research and development requirements of multi degree of freedom wave power generation device.The main achievements are as follows:? Three design principles of multi degree of freedom(MDOF)wave energy power generation device are proposed according to the two aspects of wave high thrust and low frequency characteristics and special marine working environment.Based on these principles,the floating body shape,fixed device and power grabbing device of the power generation device are designed respectively,and a series of mechanical configurations of MDOF wave energy power generation device with good structural performance and power generation performance are synthesized.Considering the influencing factors of the commercial deployment of wave power generation device,a multi index comprehensive evaluation model is constructed from four different perspectives of energy capture,reliability,environmental friendliness and adaptability by using analytic hierarchy process(AHP),and the optimal configuration of multi degree of freedom wave power generation device is selected as the research object in the following chapters.? Based on the characteristics of ocean wave motion,the forced response model of floating body is established with the help of linear micro amplitude wave theory and water quality point theory,and the kinematic response characteristics of floating body are extracted by kinematic analysis.Combined with the final configuration determined in the second chapter,through analyzing its structural characteristics,the position,velocity,acceleration and jump of each power generation branch chain of the power generation device are solved according to the vector analysis method,and the kinematic response model of the whole power generation system is established,and the extracted kinematic response characteristics of the floating body are used for kinematic analysis.? According to the characteristics of wave motion,structural characteristics of power generation device and engineering application value,the motion response index,omni-directional motion response index and wave condition adaptability index of power generation branch chain are given.Based on this,the performance of the designed multi degree of freedom wave energy power generation device and the typical cut-off wave energy power generation device in the same scale are evaluated and analyzed.The results show that the designed multi degree of freedom wave energy power generation device has good performance in the motion response of power generation branch chain,omni-directional energy conversion and wave condition adaptability.The establishment and evaluation of these performance indexes can be used for the study of structural performance and power generation performance of wave energy power generation device.? From three aspects of wave motion characteristics,structure characteristics of power generation device and engineering application value,the motion responsiveness index,omnidirectional motion responsiveness index and wave condition adaptability index of power generation branch chain are proposed.Based on this,the performance of multi degree of freedom wave energy power generation device and typical cut-off wave energy power generation device under the same scale are evaluated and compared.The results show that the designed multi degree of freedom wave energy power generation device has good performance in structure and power generation.? According to the mechanical structure of the multi degree of freedom wave power generation device and the characteristics of ocean wave motion,The three-dimensional model of the mechanical part of the power generation device is established by virtue of Solid Works^? and imported into Adams ^?.The virtual prototype of mechanical dynamics is constructed,and the simulation results are compared with Matlab^? In Simulink^?.The simulation module analyzes the motion characteristics of the forced response of the floating body,and carries out simulation experiments on the motion laws and forced response forces of each power generation branch of the multi degree of freedom wave energy power generation device.The simulation results are consistent with the kinematic and dynamic response models of the theoretical calculation of the multi degree of freedom wave energy power generation device,so as to verify the correctness of the theoretical modeling.