Predicting the ride comfort of passenger cars for single-obstacle crossings through an innovative feature extraction method consisting of non-linear geometric approximations of wavelet-transformed acceleration data and airborne sound

Rönn, Niklas Fischer-von; Meywerk, Martin

doi:10.1177/0954407013508277

Cited by 6 publications

(7 citation statements)

References 16 publications

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“…Due to the partially superimposed vibrations from front and rear axle excitation, this parameter can only be determined approximately. In order to ensure a comparable setting for original and replicated signal, the specifications of [24] are referred to. This determination is based on the wheel carrier accelerations, which represent the initial time 𝑡 of shock.…”

Section: Valuation Methodsmentioning

confidence: 99%

“…The wavelet transformation is a standard procedure for this calculation. Fischer-von Rönn [24] provides the methodology for evaluation of single obstacle crossings. Acceleration measurements at different positions are used to determine prediction models, which provide objective comfort ratings correlating to subjective ones.…”

Section: Valuation Methodsmentioning

confidence: 99%

“…However, mounting it via the roof of the body would also be an option, so that the cables would be even longer, resulting in a more undisturbed oscillation. In the following, a relative coordinate system to the seat back is defined as the longitudinal direction, which was also done that way when data was recorded [24]. The accelerometer is attached centrally on the upper part of the seat frame, approximately at shoulder height.…”

Section: Extension Of the System By Seat Back Excitation In Longitudi...mentioning

confidence: 99%

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A MIMO system for the replication of accelerations excited in a vehicle by single obstacle crossings at comfort-relevant excitation points in a comfort simulator

Reichel¹,

Meywerk²

2023

J. vibroeng.

Self Cite

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This paper presents the replication of accelerations in a vehicle excited from single obstacle crossings. The accelerations should be replicated at multiple comfort-relevant excitation points in a comfort-simulator. For the vertical accelerations at the seat rails and the foot rests, research on the positions and the number of shakers is conducted. The implementation of an electrodynamic shaker for each controlled measurement point turns out to be mandatory. By positioning them at the left and right seat rails, errors can be minimized due to similarities in the transmission behavior. The longitudinal excitations of the seat back by means of shakers are performed very precisely. The direct coupling by a construction on the headrest allows fast exchange of the vehicle seats. The combination of all acceleration replications simultaneously can be performed satisfactorily comparing them with in-vehicle field measurements. The noise-based excitation signal for system identification turns out to be a significant parameter.

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Section: Valuation Methodsmentioning

confidence: 99%

Section: Valuation Methodsmentioning

confidence: 99%

Section: Extension Of the System By Seat Back Excitation In Longitudi...mentioning

confidence: 99%

See 1 more Smart Citation

A MIMO system for the replication of accelerations excited in a vehicle by single obstacle crossings at comfort-relevant excitation points in a comfort simulator

Reichel¹,

Meywerk²

2023

J. vibroeng.

Self Cite

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“…The driver experiences a sudden jerk or shuffle stimulated by the engine start. The vibrations on the seat track are an objective quantity to judge the ride comfort of vehicles, 12 and so a three-axle piezoelectric accelerometer is employed and mounted on the driver's seat track to measure them, as shown in Figure 2. The test results of vibrations in the longitudinal direction, the lateral direction and the vertical direction respectively are obtained.…”

Section: Experimental Set-upmentioning

confidence: 99%

Experimental and numerical analysis of the seat track vibrations caused by engine starts in a power-split hybrid electric vehicle

Liu

Zhang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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An important method for saving energy and reducing the emissions from hybrid electric vehicles is to shorten the working time of the engine, which results in frequent engine starts and stops. The accompanying vibration and noise problems cause the driveability and the ride comfort to deteriorate significantly. In this study, experiments on the vibrations of the driver’s seat track are performed and analysed to evaluate quantitatively the vibrations during the engine start. The measurement results show that vibrations in the longitudinal direction are the most severe, whereas vibrations in the lateral direction are the weakest. Based on the test results, a full-vehicle multi-body dynamics model, including the driveline, the powertrain mounts and the suspensions, is developed and verified. Some countermeasures are researched using numerical simulations to reduce the uncomfortable longitudinal vibrations. Optimization analysis demonstrates that the effects of the reduction in the vibrations are limited even by the optimal initial crank angle, the start-up time and the stiffnesses of the torsional damper and the half-shafts. Hence, parameter optimizations cannot completely eliminate the uncomfortable vibrations. Fortunately, as compensation control benefits from the fast response of electric motors in hybrid vehicles, it can play an active role in reducing the longitudinal seat track vibrations and in improving the ride comfort. However, the effect of the compensation controller greatly depends on the accuracy of the torque estimator.

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“…Paul et al 7 researched test measurement equipment for sound quality evaluation. Niklas et al 8 developed a method to predict drivability using acceleration and sound. Park et al 9 presented a sound matrix of road noise.…”

Section: Introductionmentioning

confidence: 99%

The influence of noise in vehicles on the driver’s subjective evaluation of driveability

Park

Lee

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Driveability, including maneuverability, stability, and riding quality, is one of the most important factors determining the marketability of vehicles. However, unlike fuel economy or engine performance, driveability is very difficult to be evaluated quantitatively. With regard to research on vehicle noise related to driveability, existing works mainly deal with quantification or improvement methods. In this study, the various physical quantities regarding vehicle operating conditions were measured and the noise characteristics were manipulated in several ways to evaluate and analyze the influence of noise on subjective drivability. The results show that the noise level as well as noise frequency characteristics are influencing the drivers' subjective evaluation of driveability.

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Predicting the ride comfort of passenger cars for single-obstacle crossings through an innovative feature extraction method consisting of non-linear geometric approximations of wavelet-transformed acceleration data and airborne sound

Cited by 6 publications

References 16 publications

A MIMO system for the replication of accelerations excited in a vehicle by single obstacle crossings at comfort-relevant excitation points in a comfort simulator

A MIMO system for the replication of accelerations excited in a vehicle by single obstacle crossings at comfort-relevant excitation points in a comfort simulator

Experimental and numerical analysis of the seat track vibrations caused by engine starts in a power-split hybrid electric vehicle

The influence of noise in vehicles on the driver’s subjective evaluation of driveability

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