Method and device for improving torsional rigidity simulation precision of chassis frame structure

The invention discloses a method and device for improving the torsional rigidity simulation precision of a chassis frame structure, and the method comprises the steps: obtaining a geometric model of the frame structure, and carrying out the geometric processing of the bolt connection positions of a cross beam and a longitudinal beam of the geometric model of the frame structure; performing grid division on cross beams and longitudinal beams of the geometric model of the vehicle frame structure by adopting the four-deformation unit S4 and the triangular unit S3, connecting front supporting points and rear supporting points of the geometric model of the vehicle frame structure, and establishing material and section attributes of the geometric model of the vehicle frame structure; constraint is applied to a front supporting point and a rear supporting point of the geometric model of the vehicle frame structure according to a whole vehicle coordinate system, a forced displacement of 10 mm in the vertical upward d