Systems and methods for simulating contact between physical objects
The method generates a simulated object represented by finite elements each comprising two or more nodes that represent a first physical object, the first simulated object comprising a plurality of segments placed adjacent to each other to form a surface of the first simulated object. The method further includes generating a second simulated object. The method determines the distance between individual segments of the first simulated object and the plurality of segments of the second simulated object. The method determines a stiffness matrix and force vectors for the at least one segment of the first simulated object that is in contact with at least one segment of the second simulated object. The method transforms the stiffness matrix and the force vector from the segments to determine a stiffness matrix and a force vector on the two or more nodes of the finite element representation of the physical objects.
1. A method, comprising:
generating a first simulated object, in a computer system, represented by line finite elements each comprising two or more nodes that represent a first physical object, the first simulated object comprising a plurality of segments placed adjacent to each other to form a surface of the first simulated object;
generating a second simulated object that represents a second physical object, the second simulated object comprising a plurality of segments placed adjacent to each other to form a surface of the second simulated object;
determining a distance between individual segments of the first simulated object and the plurality of segments of either the first or the second simulated object;
determining a stiffness matrix for at least one segment of the first simulated object that is in contact with at least one segment of the second simulated object when the at least one segment of the first simulated object is in contact with the at least one segment of the second simulated object;
determining a force vector for the at least one segment of the first simulated object that is in contact with at least one segment of the second simulated object when the at least one segment of the first simulated object is in contact with the at least one segment of the second simulated object; and
converting the stiffness matrix and the force vector from the at least one segment of the first simulated object and the at least one segment of the second simulated object to determine a stiffness matrix and a force vector on the two or more nodes of the line finite element representation of the first and second physical objects.
2. The method of claim 1 , wherein the surface has inner segments or outer segments of the first simulated object.
3. The method of claim 1 , wherein the surface has inner segments or outer segments of the second simulated object.
4. The method of claim 1 , wherein the first physical object is any one of a beam or pipe; and the segments represent any arbitrary beam or pipe cross section.
5. The method of claim 1 , further comprising continuously monitoring the distance between an auxiliary point on the segment of the first simulated object and the segment of the second simulated object.
6. The method of claim 1 , wherein a beam or pipe is represented by multiple segments and the geometric distance between auxiliary points on these segments and other segments are used to determine proximity.
7. The method of claim 1 , wherein the segments are represented by splines or Coons surfaces to ensure that smooth beams or pipes interact with the second simulated object without introducing artificial constraints or loads.
8. The method of claim 1 , further comprising determining a predicted force when the first simulated object and the second simulated object are in contact with each other.
9. The method of claim 1 , wherein a thermal flux transfer is predicted between the two simulated objects using the segments.
10. The method of claim 1 , wherein the at least one segment of the first simulated object is determined to be in contact with the at least one segment of the second simulated object based on the distance determined.
11. A system, comprising a computer processor, operably coupled to a non-transitory memory storing computer executable instructions that, when executed by the processor:
configure a CAD computer system to generate a first simulated object represented by line finite elements each comprising two or more nodes that represent a first physical object, the first simulated object comprising a plurality of segments placed adjacent to each other to form a surface of the first simulated object;
configure the CAD computer system to generate a second simulated object that represents a second physical object, the second simulated object comprising a plurality of segments placed adjacent to each other to form a surface of the second simulated object;
configure a distance determiner to determine the distance between individual segments of the first simulated object and the plurality of segments of either the first or the second simulated object;
configure a stiffness matrix determiner to determine a stiffness matrix for at least one segment of the first simulated object that is in contact with at least one segment of the second simulated object when the at least one segment of the first simulated object is in contact with the at least one segment of the second simulated object;
configure the stiffness matrix determiner to determine a force vector for the at least one segment of the first simulated object that is in contact with at least one segment of the second simulated object when the at least one segment of the first simulated object is in contact with the at least one segment of the second simulated object; and
configure the CAD system to convert the stiffness matrix and the force vector from the at least one segment of the first simulated object and the at least one segment of the second simulated object to determine a stiffness matrix and a force vector for the two or more nodes of the line finite element representation of the physical objects.
12. The system of claim 11 , wherein the processor is configured to generate a surface that has inner segments or outer segments of the first simulated object.
13. The system of claim 11 , wherein the processor is configured to generate the surface with inner segments or outer segments of the second simulated object.
14. The system of claim 11 , wherein the first physical object is any one of a beam or pipe; and the segments represent any arbitrary beam or pipe cross section.
15. The system of claim 11 , wherein the distance determiner is configured to periodically or continuously monitor the distance between an auxiliary point on the segment of the first simulated object and the segment of the second simulated object.
16. The system of claim 11 , wherein the first and second physical object is a beam or pipe represented by multiple segments and the geometric distance between auxiliary points on the segments and other segments are used to determine proximity by the distance determiner.
17. The system of claim 11 , wherein the segments are represented by splines or Coons surfaces to insure that smooth beams or pipes interact with the secondary object without introducing artificial constraints or loads.
18. The system of claim 11 , wherein the CAD computer system is configured to determine a predicted force when the first simulated object and the second simulated object when the objects contact each other.
19. The system of claim 11 , wherein the CAD computer system is configured to predict the heat transfer to predict a thermal flux between objects.
20. An apparatus, comprising:
a processor coupled to a computer-implemented storage medium, the processor configured to:
generate a first simulated object, in a computer system, represented by line finite elements each comprising two or more nodes that represent a first physical object, the first simulated object comprising a plurality of segments placed adjacent to each other to form a surface of the first simulated object;
generate a second simulated object that represents a second physical object, the second simulated object comprising a plurality of segments placed adjacent to each other to form a surface of the second simulated object;
determine a distance between individual segments of the first simulated object and the plurality of segments of either the first or the second simulated object;
determine a stiffness matrix for at least one segment of the first simulated object that is in contact with at least one segment of the second simulated object when the at least one segment of the first simulated object is in contact with the at least one segment of the second simulated object;
determine a force vector for the at least one segment of the first simulated object that is in contact with at least one segment of the second simulated object when the at least one segment of the first simulated object is in contact with the at least one segment of the second simulated object; and
convert the stiffness matrix and the force vector from the at least one segment of the first simulated object and the at least one segment of the second simulated object to determine a stiffness matrix and a force vector on the two or more nodes of the line finite element representation of the first and second physical objects.