Simulation Development & Validation
Advancing simulation methods and their experimental validation are the focus of the “Simulation Development & Validation” research group
Although fluid power machines and phenomena have been developed and researched for many decades, the holistic simulation with all its details and physical properties is not yet possible. Accurate research and simulation of phenomena, components and systems in fluid power will be essential to achieve IIoT's goals in hydraulics and pneumatics.
In the context of the Internet of Things and Predictive Maintenance, the need for novel and accurate simulation models is constantly increasing. Regardless of the component or system, it is important to begin with the underlying physics before starting to build or develop a model in a computational environment. The developed model must meet the following criteria:
- high precision
- time-efficient calculation
- industrial applicability
The experimental validation of a simulation model is indispensable at ifas. Here the choice of the experimental set-up plays an essential role for a time- and resource-efficient model development. Our experience in
- a various industrial projects
- different simulation environments
- a state-of-the-art test field
allows us to efficiently create and validate simulations for complex systems as well as specific physical phenomena.
Subject of current research at ifas includes
- transient sealing simulation
- one-dimensional system simulation
- Elastohydrodynamics in hydraulic machines
Transient Sealing Simulation
The description of the friction between two rough surfaces is difficult to calculate, especially if the material is a malleable elastomer. Although elastomeric seals occur in any technical application, their physical treatment is not fully understood. Since sealings are an inherent part of any hydraulic system, a broad understanding of their design, optimization and lifetime calculation within a fluid power system is indispensable.
Cavitation has always been a major problem in hydraulic systems, leading to stiffness reduction of the system and cavitation erosion induced failure of the components. The prediction requires accurate physical knowledge of the mechanisms responsible for the formation and growth process of gas bubbles in the hydraulic fluid. Furthermore, fluid-specific properties, e.g. the diffusion coefficient, the relative oil moisture, the saturation vapor pressure of the oil and the maximum air solubility are required. The development of cavitation models and the determination of the material quantities required for this purpose will be a very important aspect of the fluid power and thus the ifas for the coming decades.
Onedimensional Transient System Simulation
One-dimensional transient system simulation is always necessary when highly dynamic fluid power systems require a very accurate calculation. The range of applications reaches from a pneumatically operated system within automation technology through the hydraulic system architecture of a mobile work machine to direct injection supply systems for gas or petrol-operated gasoline engines. The development of one-dimensional simulation tools is therefore an integral part of the research focus at ifas.
Gap Flow in Hydraulic Systems
Gap flows are found in any field of fluid power. Their characteristics are crucial for the behavior and the lifetime of fluid power components of any kind for example at the valve plate of an axial piston pump or underneath a piston slipper. The physical modulation especially for transient processes within this field is poorly understood and requires intensive research to estimate a detailed component and system design.
Especially for tribological systems of higher pressures and soft materials occurring in the area of hydraulic sealings Elastohydrodynamics (EHD) has to be considered. However, its mathematical and physical treatment faces enormous challenges, as it is mostly based on iterative and thus very time-consuming calculation. Solving this problem requires the search for new mathematically and physically more efficient approaches for the development of EHD simulation.
Current Research Projects
CNG Injection System
Dissolved Air in Hydraulic Systems
|Calculation of lubricant distribution in gearboxes|