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Dwyer-Joyce, R. S.; Drinkwater, Bruce W.

doi:10.1023/a:1021766216019

Cited by 28 publications

(3 citation statements)

References 1 publication

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“…The main advantage of this method is the fact that it is not limited to conducting or transparent surfaces as in the case of electrical resistance or optical methods. However, the lateral resolution of the acoustic reflection measurement with conventional transducers and equipment is relatively low (about 0.2 mm) [7]. This poor resolution can be improved by deconvolution signal processing techniques but this adds complexity to the measurement.…”

Section: Introductionmentioning

confidence: 99%

A novel test rig for in situ and real time optical measurement of the contact area evolution during pre-sliding of a spherical contact

et al. 2006

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An experimental test rig was developed in order to investigate elastic-plastic single micro-spherical contact under combined normal and tangential loading. This novel apparatus allows in situ and real time direct optical measurement of the real contact area (RCA) evolution in pre-sliding. It also allows relative displacement measurements under very low rates of tangential loading (down to 0.01 N/s) to capture accurately the fine details at sliding inception. This is achieved by piezoelectric actuation in closed loop feedback control in addition to synchronization with data and image acquisition to obtain real time measurement. The RCA measurement is realized by direct optical observation technique, whereas two different image processing algorithms were implemented for the elastic and the elastic-plastic contact regimes. The various features and capabilities of the test rig are presented along with some preliminary experimental results of RCA and friction behavior to assess its performance.

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Section: Introductionmentioning

confidence: 99%

A novel test rig for in situ and real time optical measurement of the contact area evolution during pre-sliding of a spherical contact

et al. 2006

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“…Yi Xie [28] buried the pressure sensor into the rectangular asphalt concrete and measured the vertical stress distribution of reduced-diameter tires. Intelligent methods such as ultrasonic [29] and image processing technology [30] are also gradually applied to this measurement, and the accuracy of which depends solely on the algorithm. In practical applications, environmental noise, vibration impact and other In order to study the changing characteristics of the contact stress between tire and pavement surface, the contact shape of tire and pavement surface should be clarified first.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Tire-Pavement Contact Tri-Axial Stress Distribution Based on Sensor Array

et al. 2023

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A tire’s three-dimensional stress for pavement is an important cause of asphalt pavement disease. In order to study the contact stress distribution between the tire and the pavement under real conditions, a sensor that can measure the tri-axial stress synchronously is designed, and a complete measurement system is established. The variation trend and stress value of tri-axial stress under steady rolling of the tire were obtained, and the stress distribution characteristics were analyzed. The results show that the stress in the three directions near the tire shoulder is greater than that in the crown area, and the stress peak moves gradually from front to back with the rolling of the tire. Compared with the simplified simulation model, these results provides valuable suggestions for exploring the real tire-pavement interaction.

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“…Ultrasound reflectometry being a nondestructive measuring technique has been successfully applied on a variety of static machine-element contacts including bolted joints, ball bearings, press fits [9], as well as wheel and rail specimens [10][11][12]. The technique involves pulsing an ultrasonic pressure wave toward the contact interface and deriving information from reflected signals.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Measurement of Dynamic Wheel-Rail Contacts Using Ultrasonic Reflectometry

Zhou

Brunskill

Pletz

et al. 2019

Journal of Tribology

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The contact condition between the wheel and the rail is paramount to the lifespan, safety, and smooth operation of any rail network. The wheel/rail contact condition has been estimated, calculated, and simulated successfully for years, but accurate dynamic measurement has still not been achieved. Methods using pressure-sensitive films and controlled air flow have been employed, but both are limited. The work described in this paper has enabled, for the first time, the measurement of a dynamic wheel/rail contact patch using an array of 64 ultrasonic elements mounted in the rail. Previous work has successfully proved the effectiveness of ultrasonic reflectometry for static wheel/rail contact determination. The dynamic real-time measurement is based on previous work, but now each element of an array is individually pulsed in sequence to build up a linear measurement of the interface. These cross-sectional, line measurements are then processed and collated resulting in a two-dimensional contact patch. This approach is able to provide not only a contact patch, but more importantly, a detailed and relatively high-resolution pressure distribution plot of the contact. Predictions using finite element methods (FEM) have also been carried out for validation. Work is now underway to increase the speed of the measurement.

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Cited by 28 publications

References 1 publication

A novel test rig for in situ and real time optical measurement of the contact area evolution during pre-sliding of a spherical contact

A novel test rig for in situ and real time optical measurement of the contact area evolution during pre-sliding of a spherical contact

Measurement of Tire-Pavement Contact Tri-Axial Stress Distribution Based on Sensor Array

Real-Time Measurement of Dynamic Wheel-Rail Contacts Using Ultrasonic Reflectometry

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