Download 8th International conference on turbochargers and by CRC Press PDF

Repair Maintenance

By CRC Press

ISBN-10: 0849307775

ISBN-13: 9780849307775

Development at the good fortune of a longtime sequence of profitable meetings held each 4 years in view that 1978, this ebook comprises the court cases of the eighth overseas convention on Turbochargers and Turbocharging. It provides the most recent applied sciences on the subject of engine strain charging structures from overseas and educational specialists within the box, protecting new advancements in compressors and novel consumption platforms; superior versions for cycle simulation; electro improve platforms; developments and standards; generators; and mechanical elements similar to thermomechanical research, dynamics, and axial load ability.

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Sample text

The turbine speed characteristic will be demonstrated and first optimizations gained by the calculations will be highlighted. The experimental results clearly indicate that the speed bandwidth (speed spread) of a standard exhaust gas turbocharger can be drastically reduced. The simple prototype used in this study achieved a factor of 5 reduction. Hence, the target of a turbocharger operation at quasi-steady speed seems to be feasible. Such a device will significantly improve the response characteristics of turbocharged SI engines.

For this purpose, an engine model for a 4-cylinder in-line engine was set up as a full model in the GT-Power ID calculation program. The outputs from this established simulation software include not only detailed analyses of the load changes, but also of the transient exhaust gas turbocharger and engine run-up [8]. Acceleration from a lower part load at a constant vehicle speed of 20 km/h in second gear is considered the standard example. The vehicle weight is assumed to be 1640 kg. To simulate acceleration with the new DOT concept, exhaust gas turbocharger speeds of 60,000,90,000, 120,000, and 150,000 rpm were postulated.

MINIMISING TURBOCHARGER WHOOSH From consideration of the source-path-receiver model (Fig 5), it can be seen that there are two methods to reduce turbocharger whoosh, either by improving the transfer functions of the transmission paths or by reduction of the source excitation. Both approaches were taken in parallel in this case study. Modifications to the transmission path In order to reduce the whoosh noise through modifications to the transmission path it is necessary to firstly understand which paths contribute most strongly.

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