• Marta Bermejo Escudero
4. term , Design of Mechanical Systems, Master (Master Programme)
This project is the spin-off of a previous one thus, the bases and motivations are defined first. Then, the numerical scheme of the software used, ANSYS, is included, in terms of vibrations. To decrease computational time, the equivalent radiated power is used to estimate the noise instead.

Afterwards, benchmark, mesh and directivity studies are done. Moreover, a material study of the case is included, considering three cases: full polycarbonate, mixed aluminium and polycarbonate, and full aluminium. This study incorporates modal and harmonic analyses, with the Mode Superposition method. The study revealed that the model with the full polycarbonate case has lower natural frequencies and a greater noise at low frequencies, than when aluminium is present. However, results may be affected by the chosen damping ratio.

Later, the material change is studied in terms of thermal analysis. The temperature decreases with the presence of aluminium on the case. The model can withstand temperatures with no issues regardless of the material.

Finally, a manual parametric study is done. It shows a strong negative correlation between the thickness of the case and the maximum equivalent radiated power. Additionally, the position of one of the screws has a medium positive correlation with the maximum temperature. Therefore, it is possible to minimize both responses with the parameters.
Publication date2 Jun 2022
Number of pages55
External collaboratorGrundfos DK AS
Senior Structural Specialist Nielas Winther Laue nilaue@grundfos.com
Place of Internship
Grundfos DK AS
Lead Product Simulation Specialist Lasse Søgaard Ledet lledet@grundfos.com
Place of Internship
ID: 471902010