David Lennström
Volvo
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Publication
Featured researches published by David Lennström.
ieee transactions on transportation electrification | 2016
Andreas Andersson; David Lennström; Arne Nykänen
This paper presents an evaluation of different modulation techniques and different levels of switching frequency randomization for a rear axle electrical drive unit used in automotive applications. Inverter and machine losses, and perceived sound quality of high-frequency acoustic noise are investigated by finite element calculations, experimental testing, and subjective noise assessment. Additionally, stator current harmonics, airgap flux density harmonics, and force density harmonics are compared for space vector modulation (SVM) and discontinuous pulsewidth modulation through finite element modeling. The main conclusion is that, primarily in the field weakening region, significant energy savings can be achieved (up to 17% decrease in total inverter losses with a switching frequency of 10 kHz). This is obtained without deterioration of perceived sound quality by the use of discontinuous pulsewidth modulation with switching frequency randomization. Furthermore, randomization of the switching frequency does not improve the perceived sound quality of the acoustic noise when using SVM. However, for discontinuous pulsewidth modulation, improvements in perceived sound quality when randomizing the switching frequency are observed, primarily below base speed.
SAE International Journal of Passenger Cars - Electronic and Electrical Systems | 2014
Ashish Shah; David Lennström; Per-Olof Sturesson; William Easterling
The increased focus and demands on the reduction of fuel consumption and CO2 requires the automotive industry todevelop and introduce new and more energy efficient powertrain concepts. The extensiv ...
SAE International Journal of Passenger Cars - Electronic and Electrical Systems | 2015
Arne Nykänen; David Lennström; Roger Johnsson
Subjects who are well aware of what to judge commonly yield more consistent results in laboratory listening tests. This awareness may be raised by explicit instructions and training. However, too e ...
SAE International Journal of Passenger Cars - Electronic and Electrical Systems | 2013
David Lennström; Roger Johnsson; Arne Nykänen
System and component target setting for noise and vibration are important activities within automotive product development. New challenges arise when electric motors are introduced into cars tradit ...
Applied Acoustics | 2016
David Lennström; Magnus Olsson; Frédéric Wullens; Arne Nykänen
International Congress and Exposition on Noise Control Engineering : 15/09/2013 - 18/09/2013 | 2013
David Lennström; Thomas Lindbom; Arne Nykänen
Aachen Acoustics Colloquium 2011 : 22/11/2011 - 23/11/2011 | 2011
David Lennström; Arne Nykänen
Archive | 2015
David Lennström
SAE International Journal of Passenger Cars - Electronic and Electrical Systems | 2014
David Lennström; Roger Johnsson; Arne Nykänen
SAE Technical Paper Series | 2018
David Lennström