FEM/FEA
The finite element method (FEM) or finite element analysis (FEA) is used to assess the displacement, deformation and stress or temperature distribution in mechanical structures, parts or machines.
In close cooperation with our clients, a 3D CAD model is created with enough detail to correctly simulate the behaviour of the model under the design or operational loading conditions.
The assessment of correct loading conditions can be subject to a separate process analysis requiring dynamic, heat or flow analysis.
Case studies:
Pressure vessels for the petrochemical industry are designed according to process specifications of the process owner and subject to approval certification by ASME, AD or EN. For pressure vessels designed according to ASME div 2, FEA can be required by the client or is a mandatory requirement according to paragraph 4 or 5.
ACMT has established a proven track record of pressure vessel design validation according to ASME VIII div 2 §4 and §5. The FEA is used for nozzles, cylinder-cone and cylinder-skirt transitions and internals under internal and external design, operational and test conditions for pressure, heat and mechanical forces.
The load carrying superstructures on off-shore service ships and platforms are subjected to dynamic loads of sea current, waves and wind gusts. These external loads have a strong impact on the operational and design loads of the superstructure. Correct estimation of these external loads with CFD or scale tests are at the basis of an efficient design with maximum functionality at minimum design cost.
ACMT has been commissioned by an engineering contacting company in the Antwerp region to provide the structural and dynamic FEA design and validation support to the client engineering team for the design of the superstructure of a cable laying off-shore vessel in preparation of the approval certification of the design documentation by GL. The certification by GL was awarded without any remarks.
The design of a prototype for a high rpm blower/compressor for helium, imposes stringent requirements on tolerances and surface finish for almost all parts of the machine. Tight tolerances have to be maintained, especially on rotating parts due to the specific characteristics of helium. Rotor dynamics are a key element in the design of the assembly of impeller, axis and bearings as the machine is to pass several critical speed points to attain its final rpm.
Finally, cooling requirements, due to the specific flow process in which the turbomachine is used, imposed a design of integrated heat exchangers in addition to the cooling channels in the blower body.
