Abstract
The multibody systems analysis and the finite element method already belong to the usual means of the automobile passive safety development. Specialized software systems together with the powerfull computers have reached the efficiency that is required for the practical design process.
The increasing power of the simulation tools resulting in shorter calculation times has brought the possibility to include these caculations into a larger optimisation system where a number of calculations is performed with the aim to optimize the parameters of the restraint system.
The safety belt system is analysed in this work. The restraint mechanism is described. The parametric study has brought some interesting results and suggestions for increasing the restraint efficiency. Many aspects of the restraint systems optimisation are discussed.
The optimisation study carried out has opened some new tasks to be solved:
· reduction of the number of the optimised variables
· stability and reliability of the optimisation process
· objective function choice
New ideas were used in the model of the active and intelligent belt-pretensioner. Its mathematical model has shown the possibility to decrease the dummy load compared with the passive seat belt system.