Large rigid body displacement parameter calculation method based on constraint optimization method

The invention discloses a large rigid body displacement parameter calculation method based on a constraint optimization method, and relates to the field of finite element simulation. The method comprises the following information input: determining an initial iteration parameter; setting an iteration termination condition; introducing an initial iteration parameter; calculating a rigid body displacement Jacobian matrix and a constant value diagonal matrix; calculating a position residual error and a constraint equation residual error of the deformation node; judging the iterative convergence;determining constraint conditions; judging iteration termination; calculating a constraint condition Jacobian matrix and a constraint condition multiplier coefficient; calculating new generalized rigid body displacement parameters; and calculating the number of iterations, unitizing the attitude vector and calculating the rigid body displacement. The method is used for rigid body displacement analysis of a surface, a body