Method for simulation of the life of a vehicle

1. A method for simulation and assessment of the life or dynamic strength of components of a vehicle, said method comprising:

subdividing the vehicle into individual components;

modeling the individual components by means of a finite element method;

collating the finite element models of the individual components for simulation at interfaces;

measuring or simulating externally introduced forces measured on the vehicle;

calculating the forces which occur at the interfaces or at specific points within the components, to determine weakest points from the dynamic strength point of view in the overall model;

modeling elastic structures at the interfaces in order to simulate actual flexibility or the dynamic transmission response of the vehicle structure; and

taking into account in the vehicle model at least one of stiffness data and elastomer bearing data for the elastic structures; wherein,

the vehicle model or model element is matched to the real vehicle in a plurality of iteration steps by introducing selected external forces on both the vehicle model or model element, and the real vehicle;

the forces which occur at the interfaces or at specific points within the components on the vehicle are compared by means of elastokinematic measurements for the entire vehicle model or model element;

elastokinematic characteristics, including at least inward-springing characteristic, damper characteristic, and spring constant of the various elastic structures in the vehicle model or model element, are then adapted, such that behavior of the vehicle model or model element emulates the real vehicle at the interfaces or at the specific points within the components, with respect to forces/time or movement/time; and

the iteration steps are repeated in order at the same time to adapt the elastokinematic characteristics optimally for a plurality of interfaces or a plurality of points within the components.

2. A method for simulation and assessment of the life or dynamic strength of components of a vehicle, said method comprising:

subdividing the vehicle into individual components;

modeling the individual components by means of a finite element method;

collating the finite element models of the individual components for simulation at interfaces;

measuring or simulating externally introduced forces measured on the vehicle;

calculating the forces which occur at the interfaces or at specific points within the components, to determine weakest points from the dynamic strength point of view in the overall model;

modeling elastic structures at the interfaces in order to simulate actual flexibility or the dynamic transmission response of the vehicle structure; and

taking into account in the vehicle model at least one of stiffness data and elastomer bearing data for the elastic structures; wherein,

the externally introduced forces are applied to the vehicle via simulated movement controllers, which are clamped between a fixed foundation and the interfaces, and operate in a translational or rotational direction with respect to the interfaces of the vehicle model element or model; and

required movement distances for the movement controllers are calculated from the simulation, to determine the real force and moment load on the vehicle model element or model.

3. The method as claimed in claim 2 , wherein the position of the vehicle model or model element is defined in space by defining wheel holder interfaces at the movement controllers.

4. The method as claimed in claim 1 , wherein deceleration or acceleration forces in the horizontal direction are applied to the vehicle model element or model by means of movement controllers.

5. The method as claimed in claim 2 , wherein deceleration or acceleration forces in the horizontal direction are applied to the vehicle model element or model by means of movement controllers.

6. The method as claimed in claim 1 , wherein the dynamic characteristics of the overall vehicle model or model element are first checked by simulating dynamic strength with a rigid vehicle model or model element, without any elastic structures, and thereafter successively connecting the elastic structures with the elasticity characteristics being optimized.

7. The method as claimed in claim 2 , wherein the dynamic characteristics of the overall vehicle model or model element are first checked by simulating dynamic strength with a rigid vehicle model or model element, without any elastic structures, and thereafter successively connecting the elastic structures with the elasticity characteristics being optimized.

8. The method as claimed in claim 1 , wherein the dynamic strength simulation results in data for component design by calculation of the magnitude and direction of the forces which are introduced at the interfaces or points on the components.

9. The method as claimed in claim 2 , wherein the dynamic strength simulation results in data for component design by calculation of the magnitude and direction of the forces which are introduced at the interfaces or points on the components.

10. The method as claimed in claim 1 , wherein the vehicle model element or model is used to produce a numerical life estimate for components of the vehicle, by assigning the material load capacity of the material in the vehicle model element or model for a simulated component.

11. The method as claimed in claim 2 , wherein the vehicle model element or model is used to produce a numerical life estimate for components of the vehicle, by assigning the material load capacity of the material in the vehicle model element or model for a simulated component.

12. The method as claimed in claim 1 , wherein the simulation is used in the development phase of the vehicle in order to test and to design the dynamic strength of the vehicle chassis, structure, engine bearing, drive train or bodywork.

13. The method as claimed in claim 2 , wherein the simulation is used in the development phase of the vehicle in order to test and to design the dynamic strength of the vehicle chassis, structure, engine bearing, drive train or bodywork.

14. The method as claimed in claim 1 , wherein the interfaces are provided in proximity to articulation points of the bodywork on its chassis or engine.

15. The method as claimed in claim 2 , wherein the interfaces are provided in proximity to articulation points of the bodywork on its chassis or engine.

16. A software program product comprising a computer readable medium encoded with a program for causing a data processor to perform a method for simulation and assessment of the life or dynamic strength of components of a vehicle, wherein said method comprises:

subdividing the vehicle into individual components;

modeling the individual components by means of a finite element method;

collating the finite element models of the individual components for simulation at interfaces;

measuring or simulating externally introduced forces measured on the vehicle;

calculating the forces which occur at the interfaces or at specific points within the components, to determine weakest points from the dynamic strength point of view in the overall model;

modeling elastic structures at the interfaces in order to simulate actual flexibility or the dynamic transmission response of the vehicle structure; and

taking into account in the vehicle model at least one of stiffness data and elastomer bearing data for the elastic structures; wherein,

the vehicle model or model element is matched to the real vehicle in a plurality of iteration steps by introducing selected external forces on both the vehicle model or model element, and the real vehicle;

the forces which occur at the interfaces or at specific points within the components on the vehicle are compared by means of elastokinematic measurements for the entire vehicle model or model element;

elastokinematic characteristics, including at least inward-springing characteristic, damper characteristic, and spring constant of the various elastic structures in the vehicle model or model element, are then adapted, such that behavior of the vehicle model or model element emulates the real vehicle at the interfaces or at the specific points within the components, with respect to forces/time or movement/time; and

the iteration steps are repeated in order at the same time to adapt the elastokinematic characteristics optimally for a plurality of interfaces or a plurality of points within the components.

17. A software program product comprising a computer readable medium encoded with a program for causing a data processor to perform a method for simulation and assessment of the life or dynamic strength of components of a vehicle, said method comprising:

subdividing the vehicle into individual components;

modeling the individual components by means of a finite element method;

collating the finite element models of the individual components for simulation at interfaces;

measuring or simulating externally introduced forces measured on the vehicle;

calculating the forces which occur at the interfaces or at specific points within the components, to determine weakest points from the dynamic strength point of view in the overall model;

modeling elastic structures at the interfaces in order to simulate actual flexibility or the dynamic transmission response of the vehicle structure; and

taking into account in the vehicle model at least one of stiffness data and elastomer bearing data for the elastic structures; wherein,

the externally introduced forces are applied to the vehicle via simulated movement controllers, which are clamped between a fixed foundation and the interfaces, and operate in a translational or rotational direction with respect to the interfaces of the vehicle model element or model; and

required movement distances for the movement controllers are calculated from the simulation, to determine the real force and moment load on the vehicle model element or model.