Abstract: It was difficult for the gear-rack steering mechanism to form a standard unified simulation scheme in the actual design and verification process, and its performance evaluation was not intelligent enough under extreme working conditions. Aiming at these problems, the key technology of auxiliary evaluation for gear-rack steering mechanism was studied based on knowledge reasoning and finite element simulation technology. First of all, the knowledge expression model of object-attribute-value triplet was adopted to construct the knowledge base of the system. The intelligent configuration generation of the steering mechanism simulation model was realized by the strategy of forward reasoning. On this basis, the encapsulation technology of steering mechanism simulation process was studied by object-oriented technology, a platform independent model of simulation for steering mechanism was constructed, and an auxiliary evaluation system for gear-rack steering mechanism was developed. The performance of a certain type of gear-rack steering mechanism was evaluated using this system. The results indicate that when the torque reaches 300N·m, the meshing strength of the rack and pinion is less than the allowable stress, which meets the design requirements; the shell stress reaches 261MPa, and the shell breaks; through optimization, the stress drops to 207MPa, which is less than the allowable stress and meets the design requirements; automated modeling and simulation technology can reduce modeling time by more than 50%.

Key words: gear-rack steering mechanism; auxiliary evaluation system; knowledge inference technology; object-oriented technology

TAO Yong, CHU Chang-yong, GAO Ze-feng, et al. Auxiliary evaluation system for gear-rack steering mechanism［J］.Journal of Mechanical & Electrical Engineering, 2021,38(11):1402-1409.