| Title | Presenter |
|---|---|
| Simulation of a high-speed compressor supported in airfoil bearings for fuel cell application | Gerrit NOWALD, Dassault Systèmes for Thomas MAUZ, ZF Friedrichshafen AG |
| Simulation of Foil Air Bearings in Fuel-Cell Applications | Martin BUSCH, Schaeffler Technologies AG & Co. KG |
| Digital Suspension Controller Design for adjustable Damper | Brix TEGEDER, Mercedes-Benz Group AG |
| Optimization of NVH launching performance of a heavy-duty truck using SIMPACK as FMU in interdisciplinary co-simulation | Marc LÄSSING, Daimler Truck AG |
Simulation of a high-speed compressor supported in airfoil bearings for fuel cell application
The creation of a highly integrated Fuel Cell e-Drive solution demands high efficiency and longevity of its components. In this regard, ZF is developing high-speed air compressors supported in Air Foil Bearings. To achieve optimal vibration behavior of the rotor, a multibody model build up with Simpack is employed.
Presenter: Gerrit NOWALD, Dassault Systèmes for Thomas MAUZ, ZF Friedrichshafen AG
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|---|---|
Simulation of Foil Air Bearings in Fuel-Cell Applications
Lubricated plain and roller bearings are less suited for sensitive systems where oil contamination is disadvantageous, e.g., fuel cell compressors. Such applications preferably use gas bearings where the rotor runs on an air cushion, for instance. A foil structure is introduced into the bearing which forms a supporting hydrodynamic gap to the rotor journal. The foils are very thin and elastic in order to adapt disturbances from load changes or rotor tilting. This leads to several nonlinear influences, such as nonlinear stiffness, frictional contacts and form deviations in the foils. As a further complication, the air film behaves nonlinear too, in analogy to oil-lubricated plain bearings, which leads to speed- and load-dependent natural frequencies and to bearing instabilities ("rotor whirl"). These complex properties make it difficult to design the rotor-bearing system. It is therefore necessary to support the design process with simulative methods to optimize the bearing in terms of load capacity, lift-off behavior, stability and friction. For this purpose, an EHD calculation tool was implemented at Schaeffler which estimates the pressure distribution in the bearing. The code is based on the numerical calculation of the compressible Reynolds equation using a finite-element approach. To calculate the transient rotor-bearing behavior, the code can be coupled to Simpack by means of a parallelized co-simulation interface, see Fig.1. Hence, coupling effects between the bearings can be considered as well as the influences from the rotor dynamics.
Presenter: Martin BUSCH, Schaeffler Technologies AG & Co. KG
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Digital Suspension Controller Design for adjustable Damper
This presentation will give an introduction to our process to create a suspension controller in the digital
phase of the vehicle design proces. With the use of the simat interface we created a co-simulation
between the simpack vehicle model and the Simulink controller. This gives us the abiity to design the
controller and perform subjective and objective testing.
Presenter: Brix TEGEDER, Mercedes-Benz Group AG
Optimization of NVH launching performance of a heavy-duty truck using SIMPACK as FMU in interdisciplinary co-simulation
Modern trucks today use mainly automated manual transmissions including automated clutch control. Launching behavior is mainly depending on electronic clutch control, as well as various hardware parameters like clutch friction behavior or clutch friction pad stiffness. To optimize the launching behavior regarding NVH and performance a full vehicle model including ECUs for engine, clutch and transmission control was created, using Simpack as FMU inside an in-house co-simulation tool. Hardware parameters and Software versions were evaluated to improve the launching behavior.
Presenter: Marc LÄSSING, Daimler Truck AG
