Structural Modeling And Analysis Of The Bionic Hand In Brain-computer Interface Technology

With the advances of medical technology, the state pays more and more attention to those with physical disabilities, especially the quality of life of patients with severe physical disabilities, and thus the development of bionic hand becomes an expert research hot, and has made great progress, along with, for these control the source signal problems of bionic hand is constantly exploring, in recent years, the development and maturation of BCI (Brain Computer Interface), and for patients who have severe muscle injury paralysis provides a new means of communication, the patient can pass EEG(Electroen Cephalograph) to control movements of the bionic hand, in order to bring the great convenience to life. In this paper, which is based on the research status of the bionic hand and control the source of in-depth analysis summary, structure optimization design and performance of the bionic hand are analyzed, and the entire system of the application of BCI has been under construction and experiments emulation.First, from the perspective of bionic, on the basis of design of the structure and size of a man’s hand, which is carried on the optimization analysis of structure form and parameters of bionic hand, design concrete structures of a bionic hand, and use finite element analysis software for bionic hand three-dimensional modeling, which includes the model of the thumb and the forefinger and the other three fingers, the three-dimensional model of the palm and finger root, and a schematic model of a finger of the internal cross section of the interlocking mechanism and assembly of the entire humanoid robot.Second, confirmatory analysis of bionic hand structure which is designed and built, which uses software for structural statics analysis on finger structure, and optimize the thickness of phalanx of finger. By using the D-H parameter representation method, a dynamic model is established, and in accordance with established palm, thumb, index finger coordinates, kinematics equations of each finger joints end coordinates is derived, according to these equations, using MATLAB software to analyze the plane and spatial trajectory of the thumb, index finger, the rationality of the structure of the bionic hand and the correct size of the structure are verified. Further,by using software for prosthetic hand overall motion dynamics simulation.Finally, the bionic hand applies to the entire application system of BCI system, which is under construction, the experiment on rats "stretch-shrinkage" behavior is generated when the brain neural signal collected, detection, feature extraction and classification of signals, obtain two types of signal during the behavior of rats "stretch-shrinkage", and decode both types of signals by the control unit emulation circuit module, two instructions decoded respectively for the control of bionic hand thumb and index finger two finger pinch-Exhibition action simulation.