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Solutionskatalog2016_EN

/ 39 Rotor dynamics – first order excitation and sub-harmonics Floating bushing – inner and outer bearing oil film pressure at 100,000 rpm REDUCING CO2-EMISSIONS AVL BOOST and AVL FIRE® offer an advanced pressure charging simulation system. Users benefit from the ability to: • Select a turbocharger to match a given engine • Design new turbochargers with engine matching at every design stage • Readily change compressor and turbine sizes and predict the effect • Rapidly improve the turbocharging system, and determine the impact of wastegates, variable geometry, exhaust gas recirculation and component losses ROTOR DYNAMICS AND BEARING ANALYSIS OF TURBOCHARGING SYSTEMS The investigation of the dynamic stability of the rotor bearing system is an important analysis target for the design of automotive and industrial turbochargers. This requires a multi-body dynamic solution including non-linear models for slider bearings with floating bushings capable of calculating the dynamic system behavior for rotor speeds up to 250,000 rpm. AVL EXCITE considers all these effects with different levels of detail. The run-up calculation approach supports the detection of critical speeds caused by torsional and bending resonances. The elasto-hydrodynamic bearing model is applied to include the influence of full or semi floating bushing configurations including bores in the bushing to connect the inner and outer oil film of the bearings. The results obtained with AVL EXCITE allow engineers to find an optimal matching of design parameters for damping the rotor system, oil mass flow and sensitivity for resonances. Complex turbulent flow


Solutionskatalog2016_EN
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