Real-Time Estimation of Wheel Imbalances for Chassis Prognosis

Shin, Kwang-Keun; Bae, Hong

doi:10.4271/2010-01-0245

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…Excessive wheel unbalance generates vibrations that are transmitted to the adjacent components. As a result, they cause accelerated wear to the tyres, bearings, suspension, and steering components, while also reducing driving comfort [21,23]. From the driver's point of view, wheel unbalance is usually revealed by steering wheel vibration, which is more pronounced at higher driving speeds.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the effect of passenger car wheel unbalance on driving comfort

Hryciów

Wiśniewski

Rybak

et al. 2021

The Archives of Automotive Engineering – Archiwum Motoryzacji

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This paper presents the results of experimental investigations of the effects of car wheel unbalance on driving safety and comfort. Basic information about types of wheel unbalance, their causes, and effects are included. The test subject was a BMW 3 Series car with rear-wheel drive. A specific unbalance was introduced on the front steered wheels. The vehicle was driven in a straight line on an asphalt road in good condition at speeds between 70 km/h and 140 km/h. During the test runs, acceleration waveforms were recorded from sensors placed on the lower control arm, driver's seat, and steering wheel. The vibration level of the unbalanced wheel increases with the driving speed and with the increase in unbalance. The highest increase in vibration amplitude occurred on the steering wheel at speeds between 100 km/h and 120 km/h. These vibrations have a direct effect on the driver. This is evidenced by negative driver perceptions such as fatigue and driving discomfort. This was also confirmed by the calculated vibration exposure levels. Driving with unbalanced wheels accelerates wear on the tyres, steering, drive, and suspension components of the vehicle.

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Section: Introductionmentioning

confidence: 99%

Assessment of the effect of passenger car wheel unbalance on driving comfort

Hryciów

Wiśniewski

Rybak

et al. 2021

The Archives of Automotive Engineering – Archiwum Motoryzacji

View full text Add to dashboard Cite

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Identification of Static Unbalance Wheel of Passenger Car Carried out on a Road

Prażnowski

Brol

Augustynowicz

2014

SSP

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This paper presents a method of identification of non-homogeneity or static unbalance of the structure of a car wheel based on a simple road test. In particular a method the detection of single wheel unbalance is proposed which applies an acceleration sensor fixed on windscreen. It measures accelerations cause by wheel unbalance among other parameters. The location of the sensor is convenient for handling an autonomous device used for diagnostic purposes. Unfortunately, its mounting point is located away from wheels. Moreover, the unbalance forces created by wheels spin are dumped by suspension elements as well as the chassis itself. It indicates that unbalance acceleration will be weak in comparison to other signals coming from engine vibrations, road roughness and environmental effects. Therefore, the static unbalance detection in the standard way is considered problematic and difficult. The goal of the undertaken research is to select appropriate transformations and procedures in order to determine wheel unbalance in these conditions. In this investigation regular and short time Fourier transform were used as well as wavelet transform. It was found that the use of Fourier transforms is appropriate for static condition (constant velocity) but the results proves that the wavelet transform is more suitable for diagnostic purposes because of its ability of producing clearer output even if car is in the state of acceleration or deceleration. Moreover it was proved that in the acceleration spectrum of acceleration measured on the windscreen a significant peak can be found when car runs with an unbalanced wheel. Moreover its frequency depends on wheel rotational frequency. For that reason the diagnostic of single wheel unbalance can be made by applying this method.

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