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Reduction of Mechanical Friction in Combustion Engines Market DriversThe reduction of mechanical friction in combustion engines and powertrains improves fuel consumption and exhaust gas emissions. It also significantly increases the durability of individual components by minimizing wear. Numerical analysis methods can accurately calculate mechanical friction, in preference to costly physical measurements of real components. Testing here requires significant resources, and in many cases it is not even possible to obtain measurement data.
AVL ApproachWith AVL EXCITE contacts can be analyzed on different levels. The range covers simple approaches during concept design such as the Stribeck curve (which describes friction force in relation to sliding velocity) to detailed elastohydrodynamic (EHD) contact models for slider bearings (radial and axial) and piston / piston ring-cylinder liner contacts. The EHD models of AVL EXCITE are especially powerful since they allow calculation of the real physical behavior of oil-lubricated contacts and are able to differentiate between hydrodynamic and asperity contact friction.
AVL EXCITE Strengths- Single solution packs or complete integrated tools solution – depending on the application target
- Highly sophisticated EHD contact models include asperity contact model, influence of surface roughness using Average Reynolds method, local variable and transient temperature influence (Thermal-EHD), pressure, temperature and shear-rate dependent oil viscosity
- Oil property database supporting multiple math models (Vogel, Roelands, etc.)
- Wear rate model using Archard’s law for abrasive wear
- Off-line EHD bearing interface to FLOWMASTER® (to support engine lubrication system analysis with accurate bearing boundary conditions)
Your Benefits- Applicable to damage and cavitation investigations
- Possibility of separating friction losses of subsystems with total losses gained by measurements (contribution of individual sources)
- Compared with purely experimental approaches, numerical analysis saves time and money when studying the influence of design parameters
- Detailed EHD contact models support the design of slider bearings and investigation of lubrication conditions for pistons and piston rings
- Capable of wear rate prediction including change of contact profile for EHD joints and piston ring-liner contact
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