Load bearing element and a method for manufacturing a load bearing element
A load bearing element for attachment of a heat generating unit to a heat sensitive supporting structure, wherein said load bearing element includes at least one body integrally formed by additive layer manufacturing, ALM. The body is adapted to provide a controlled heat transfer from said heat generating unit to said heat sensitive supporting structure.
1. A combination of a heat generating unit, a heat sensitive supporting structure and a load bearing element for attachment of the heat generating unit to the heat sensitive supporting structure, wherein said load bearing element comprises:
at least one body integrally formed by additive layer manufacturing (ALM), said body being adapted to provide a controlled heat transfer from said heat generating unit to said heat sensitive supporting structure, said at least one body including an outer conical body with a base of the outer conical body connected to the heat sensitive supporting structure and an apex of the conical body connected to the heat generating unit and an inner conical body with a base of the inner conical body connected to the outer conical body and an apex of the inner conical body connected to the heat sensitive supporting structure,
wherein the integrally manufactured body of said load bearing element is a load bearing bracket for attachment of the heat generating unit to said heat sensitive supporting structure being a fuselage of a flying vehicle,
wherein said integrally manufactured body of said load bearing element comprises several layers printed from the same or different fire proof materials, and
wherein the at least one body comprises a plurality of ventilation holes configured to allow a fluid to enter and to leave internal cavities of the outer conical body and the inner conical body.
2. The combination according to claim 1 , wherein the integrally manufactured body of said load bearing element is formed such that
the integrally manufactured body is configured to shield the heat sensitive supporting structure from thermal radiation emitted directly or indirectly by said heat generating unit, and/or that
the integrally manufactured body is configured to transfer thermal energy received from said heat generating unit by a fluid moving by convection through cooling cavities and/or along cooling ribs of said integrally manufactured body to the surrounding, and/or that
the integrally manufactured body is configured to spread the thermal energy received from said heat generating unit by thermal conduction via said integrally manufactured body to a footprint area,
where the load bearing element is attached to said heat sensitive supporting structure.
3. The combination according to claim 1 , wherein the integrally manufactured body of said load bearing element is formed such that by the controlled heat transfer a mechanical stiffness throughout said integrally manufactured body of said load bearing element and/or a mechanical stiffness of said heat sensitive supporting structure is maintained for a load less than an admissible maximum load, carried by said load bearing element and/or a thermal energy less than a maximum thermal energy generated by said heat generating unit and/or is formed such that the integrally manufactured body at least partially absorbs mechanical forces.
4. The combination according to claim 1 , wherein the printed layers of the integrally manufactured body of the load bearing element have different heat transport properties or other physical properties, depending on the position of the respective printed layers relative to the heat generating unit attached by said load bearing element to said heat sensitive supporting structure.
5. The combination according to claim 4 , wherein layers of said integrally manufactured body located proximal said heat generating unit comprise at least first thermal conductivity lower than an at least second thermal conductivity of layers located proximal the heat sensitive supporting structure.
6. The combination according to claim 4 , wherein layers of the integrally manufactured body proximal said heat generating unit provide an at least first radiation shielding higher than an at least second radiation shielding of layers located proximal the heat sensitive supporting structure.
7. The combination according to claim 1 , wherein a cross-section through said integrally manufactured body of said load bearing element parallel to said heat sensitive supporting structure increases towards the heat sensitive supporting structure to spread the thermal energy received from said heat generating unit to an extended footprint area, where the load bearing element is attached to said heat sensitive supporting structure.
8. The combination according to claim 1 , wherein the integrally manufactured body of the load bearing element comprises a three-dimensional structure printed by additive layer manufacturing (ALM) according to a three-dimensional bionic design data model read from a database.
9. The combination according to claim 1 , wherein the heat generating unit is an auxiliary power unit (APU) mounted in a fire compartment of a flying vehicle or of a land vehicle.
10. A vehicle comprising at least one combination according to claim 1 .