Analyses Of The Four-bar Coupler Curve Based On The Algorithm Of BP Neural Network

The formula of coupler curve almost can't be accurately given because of the complex of types of Four-bar coupler curver, while the application of Four-bar coupler curver in mechanical engineering is widely used. So the study to Four-bar coupler curver is noticed by many experts all through the ages. Now analyses of the Four-bar coupler curve based on the algorithm of artificial neural networks is widely noticed. The study of this paper on Four-bar coupler curver will bring the algorithm of BP neural network(NN).At first this paper gives the types of Four-bar coupler curver, and then analyses against the different classifications of the curve. We can conclude there is a certain nonlinear relationship of Four-bar linkage curves and the parameters of Four-bar linkage. With Delphi software compiled the Four-bar linkage parameters can accurately draw a corresponding link curve, and with Matlab software digital characteristics (non-moment) of Four-bar linkages can be extracted, the sample database are built by the parameters of Four-bar linkages and the the corresponding characters (non-moment)of the Four-bar coupler cures. By this sample database, and characters of Four-bar coupler curve as the input, power coefficient of the parameters of Four-bar linkages and the corresponding characters can be get. At last the parameters of Four-bar linkages corresponding characters (non-moment)of the Four-bar coupler cure can be calculated. As the non- moment zoom invariance, therefore, when the question curves and the Four-bar coupler curve which be calculated by the algorithm of BP neural networks are similar, the parameters of Four-bar linkages can be get by corresponding proportion.Oval shaped curve and 8-type curve for two Four-bar linkages that curve will be used for the example of this paper. The curves are dealt with by using the methods which have been given before. The relative error of Four-bar linkage curves meet with the requirements of design in a general way. This method verifies better nonlinear by using the BP network algorithm to the 8-type curve (or oval shaped curve) and Four-bar linkage. At the same time this method also proved this way has a comprehensive feasibility, practicality.