Fahrwiderstands-bestimmung im realen Fahrbetrieb

Mayer, W.; Wiedemann, Jochen; Neubeck, Jens

doi:10.1007/bf03224411

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…This approach gives excellent results, yet extensive preliminary investigations as well as vehicle preparation and conditioning are necessary, and additionally the recording of yaw angle and pitch angle during the coastdown is advised [3,6 ]. Therefore, this approach is not indicated for an industrially practicable method without extensive initial investigations and testing equipment.…”

Section: Coastdown Analysismentioning

confidence: 94%

“…The state-of-the-art method for extracting the drag coe cients from coastdown data is to nd a mathematical model for all contributions to the resistive force, based on empirically determined functional relationships, and t it to the sampled data. This approach gives excellent results, yet extensive preliminary investigations as well as vehicle preparation and conditioning are necessary, and additionally the recording of yaw angle and pitch angle during the coastdown is advised [3,6 ]. Therefore, this approach is not indicated for an industrially practicable method without extensive initial investigations and testing equipment.…”

Section: Coastdown Analysismentioning

confidence: 99%

“…However, current investigations indicate an improvement in the steady state torque measurement method [6 ]. Nevertheless, the isolation of the various contributions to the resistive force is a delicate task that can be done only with costly experimental e ort and appropriate analytical techniques.…”

Section: Introductionmentioning

confidence: 98%

“…Several investigations (see, for example, references [3] to [5]) have shown that the coastdown technique is preferable to the alternative steady state torque method for measuring total drag and then separating it into its constituents. However, current investigations indicate an improvement in the steady state torque measurement method [6 ]. Nevertheless, the isolation of the various contributions to the resistive force is a delicate task that can be done only with costly experimental e ort and appropriate analytical techniques.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On-road determination of aerodynamic drag improvements

Bischof¹,

Bratschitsch²,

Haas³

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part D:

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The objective of this work is an attempt to understand the potential for aerodynamic improvements by the application of di erent under oor panels that might be masked by traditional xed-ground wind tunnel testing. The coastdown method is chosen to determine drag coe cients on the road which could then be compared with wind tunnel data. Of prime importance were the simplicity and practicability of the developed analysis method, with particular emphasis on industrial applicability. As a result of the investigations, the resolution of the new method and an astonishing conformity of the identi cation of small changes in the under oor con guration of the test vehicle with wind tunnel tests are demonstrated. Keywords: vehicle aerodynamic improvements, under oor panels, on-road method NOTATION A vehicle frontal area (m2) c d air drag coe cient c i drag coe cients (N s/m, N s2/m2) F rm rolling and mechanical losses (N ) m vehicle mass (kg) m d vehicle e ective mass (kg) t time (s) ¢t duration of coastdown (s) v vehicle speed (m/s) v max maximum vehicle velocity (m/s) v min minimum vehicle velocity (m/s) v r total relative airspeed (m/s) r air density ( kg/m3)

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Section: Coastdown Analysismentioning

confidence: 94%

Section: Coastdown Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On-road determination of aerodynamic drag improvements

Bischof¹,

Bratschitsch²,

Haas³

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…These are rolling resistance, air resistance (drag), climbing resistance and acceleration resistance[8].In order to simulate these driving resistances on the test bench, the coefficients of a polynomial are determined by performing coasting experiments. This helps in finding a correlation between driving resistances and velocity[9].…”

mentioning

confidence: 96%