Structural mechanics

decrease time to market by elimination lifetime testing.

DEMCON macawi respiratory systems is a total solution provider of Respiration Technology. Determination of the reliability of the OEM blower modules is an important part of the design process, especially for medical applications. In order to reduce the necessary time for extensive durability tests, in-depth analysis of the strength and dynamics behavior of the blower module was performed. For optimal responsiveness of the radial turbine blower, a very low rotary inertia is essential. This has been an important requirement for the choice of the motor and the construction of the impeller of the turbine. Furthermore, the mechanical design has been optimized for simple integration into a housing regarding noise reduction and mechanical vibration absorption.

Designing a blower module for a respiratory system

our approach.

Together with the manufacturer the specifications were defined; loads, rotations, environment and lifetime. After modeling and meshing the blower geometry, Finite Element Analysis was performed. The analysis includes the rotational effects to determine maximum stresses and possible unstable behavior during operation cycle.

Making use of Campbell diagrams, representing the system’s response as a function of its oscillation, a whirl speed map was created. Critical areas are localized and identified, making sure that the critical speeds are well-damped.


Demcon multiphysics.

Demcon multiphysics is an engineering agency with high-end expertise in the area of heat transfer, fluid dynamics, structural mechanics, acoustics, electromagnetism and nuclear physics. We support clients from a wide variety of market sectors and help them achieve their goals in research and development with deep physical insights.

We combine fundamental physical knowledge from an analytical approach with Computer Aided Engineering (CAE) simulations tools from ANSYS, MATHWORKS, COMSOL, STAR-CCM+ and FLUKA to setup, execute, analyze and evaluate numerical simulations. The use of Computational Fluid Dynamics (CFD), Finite Element Analysis (FEM / FEA), Lumped Element Modelling (LEM), Computational Electromagnetics (CEM) and Monte Carlo simulations enables us to make a virtual prototype of your design. With these techniques we can simulate the fluid and gas flows, energy exchange, heat and mass transfer, stresses, strains and vibrations in structures and the interaction of electromagnetic fields with other physical aspects like heat generation. Simulation-driven product development increases the development efficiency and reduces the product development time. Our services can therefore fully support you in the designing phase, from idea up to prototype, from prototype to final design.