Development Of Design Software On Generation Of Path Curves With Four-bar Linkage Mechanism Based On Neural Networks

Four-bar linkage mechanism of the plane lower mechanism, which is widly applied, is in common use. Linkage curves is the movement track of the points of the lingkage mechanism, which have all sorts of track curves ,relative to the stand. Four-bar linkage mechanism can be transformed into many four-bar mechanisms with pure-slide pair, which can make more lingkage curves. Linkage curves have all sorts of shapes and all ordinary geometrical curves can be genarated from them. They can satisfy the request of the rule of straight-lines mechanism or other mechanism and have simple struction ,can be easily manufactured and reliably work. For example, path curve of some point in linkage plane can be designed according to the figure of process parts, then it can be processed according to the anticipant figure as long as fixing the tools on that point.The task of this thesis is to find salvations, which can rapidly and exactly generate the given movement path curves and find the corresponding four-bar linkage mechanism. It is firstly applied to use B-spline curves to match linkage curves. For every linkge curve, finad its appropriate points,according to which calculate its control points, which are put into database , representing the lingkage curves。When s designer need some linkage curve, he only need use corresponding control points to generate the spline-curve,which is the linkagecurve.The author also applies the NN, set these control points as the input-data of the NN, set corresponding four-bar linkage mechanism parameters as the output-data of the NN. When it is trained successfully, input the control points,it can output corresponding four-bar linkage mechanism parameters.The soft ultimately solved the generation of the given movement path curve and the design of four–bar linkage mechanism.