Road contact stresses and forces under tires with low inflation pressure

Many field trials have been undertaken to demonstrate the benefits of reducing the inflation pressure of the tires of heavily loaded haul vehicles, but few carefully controlled laboratory studies have been performed. An earlier full scale laboratory study indicated that tire inflation pressure had far less effect on subgrade strains for unpaved, single-layer granular road structures than the tire loading itself, so attention was directed to the behaviour of the granular base at the tire tread - road surface interface. In the present paper, the results of full scale tests performed using a laboratory apparatus designed to measure the dynamic vertical, transverse, and longitudinal contact forces under tires with varying loads and inflation pressures are reported. Vertical contact forces were observed to be highly non-uniform, both across and along the contact patch.Key words: central tire inflation systems, CTI, model study, haul trucks, unbound roads, unpaved roads, access roads.

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Influence of single-layer geotextile reinforcement on load capacity of buried steel box structure based on laboratory full-scale tests

Thin-Walled Structures ◽

10.1016/j.tws.2020.107312 ◽

2020 ◽

pp. 107312

Author(s):

Adam Wysokowski

Keyword(s):

Load Capacity ◽

Single Layer ◽

Full Scale ◽

Box Structure ◽

Full Scale Tests

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Pipeline Inspection With the High Resolution EMAT ILI-Tool: Report on Full-Scale Testing and Field Trials

Volume 2: Integrity Management; Poster Session; Student Paper Competition ◽

10.1115/ipc2006-10156 ◽

2006 ◽

Cited By ~ 1

Author(s):

Martin Klann ◽

Thomas Beuker

Keyword(s):

High Resolution ◽

Crack Detection ◽

New Technology ◽

Wave Theory ◽

Field Trials ◽

Guided Wave ◽

Full Scale ◽

Operational Conditions ◽

Full Scale Tests ◽

Disbonded Coating

In succession of a research project to develop an EMAT in-line inspection technology for the detection of stress corrosion cracking (SCC) and disbonded coating, a 16” EMAT inspection tool was manufactured and tested. This 16” EMAT Crack Detection (ECD) Tool establishes a new high-resolution approach to effective and accurate crack inspection technology especially for gas lines. The performance of this tool was tested on several pipe samples containing natural SCC as well as artifical anomalies and laminations. Furthermore, a field test is currently being conducted, which will detail the tools performance under operational conditions. The new technology will be compared to the results from the established Magnetic Flux Leakage inspection (MFL) technology. EMAT inspection technology, originally designed for detection of SCC, is also sensitive to areas of disbonded coating, other crack-like features, and anomalies like gouging and channeling. To distinguish the different types of pipeline threats, a qualitative defect sizing process is under development incorporating the EMAT data and the information from the other in-line inspection technologies. Following an introduction into EMAT guided wave theory, data from a series of full-scale tests obtained with 34” prototype sensors and the complete 16” ILI-EMAT tool, will be presented. The inspection tool itself, as well as the process for evaluating the recorded data, are undergoing continuous improvements. This paper will discuss the development status of these technologies.

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Full Scale Tests of Water Mist Fire Suppression Systems for Navy Shipboard Machinery Spaces. Part 2. Obstructed Spaces.

10.21236/ada306668 ◽

1996 ◽

Cited By ~ 9

Author(s):

G. G. Back ◽

P. J. DiNenno ◽

Joseph T. Leonard ◽

R. L. Darwin

Keyword(s):

Fire Suppression ◽

Water Mist ◽

Full Scale ◽

Full Scale Tests ◽

Suppression Systems

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Full-scale tests on smoke temperature distribution in long-large subway tunnels with longitudinal mechanical ventilation

Tunnelling and Underground Space Technology ◽

10.1016/j.tust.2020.103784 ◽

2021 ◽

Vol 109 ◽

pp. 103784

Author(s):

Congling Shi ◽

Jian Li ◽

Xuan Xu

Keyword(s):

Mechanical Ventilation ◽

Temperature Distribution ◽

Full Scale ◽

Full Scale Tests ◽

Subway Tunnels

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Investigation of planing craft maneuverability using full-scale tests

Proceedings of the Institution of Mechanical Engineers Part M Journal of Engineering for the Maritime Environment ◽

10.1177/14750902211030386 ◽

2021 ◽

pp. 147509022110303

Author(s):

Kazem Sadati ◽

Hamid Zeraatgar ◽

Aliasghar Moghaddas

Keyword(s):

Full Scale ◽

Performance Characteristics ◽

Forward Speed ◽

Speed Reduction ◽

Planing Craft ◽

Full Scale Tests ◽

Turning Maneuver

Maneuverability of planing craft is a complicated hydrodynamic subject that needs more studies to comprehend its characteristics. Planing craft drivers follow a common practice for maneuver of the craft that is fundamentally different from ship’s standards. In situ full-scale tests are normally necessary to understand the maneuverability characteristics of planing craft. In this paper, a study has been conducted to illustrate maneuverability characteristics of planing craft by full-scale tests. Accelerating and turning maneuver tests are conducted on two cases at different forward speeds and rudder angles. In each test, dynamic trim, trajectory, speed, roll of the craft are recorded. The tests are performed in planing mode, semi-planing mode, and transition between planing mode to semi-planing mode to study the effects of the craft forward speed and consequently running attitude on the maneuverability. Analysis of the data reveals that the Steady Turning Diameter (STD) of the planing craft may be as large as 40 L, while it rarely goes beyond 5 L for ships. Results also show that a turning maneuver starting at planing mode might end in semi-planing mode. This transition can remarkably improve the performance characteristics of the planing craft’s maneuverability. Therefore, an alternative practice is proposed instead of the classic turning maneuver. In this practice, the craft traveling in the planing mode is transitioned to the semi-planing mode by forward speed reduction first, and then the turning maneuver is executed.

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