scholarly journals Full Scale Tank Car Coupler Impact Tests

2003 ◽  
Author(s):  
Matthew L. Lyons ◽  
William T. Riddell ◽  
Kevin D. Koch
Keyword(s):  
Load Transfer ◽  
Response Spectrum ◽  
Full Scale ◽  
Impact Tests ◽  
Load Transfer Mechanism ◽  
Time Relationship ◽  
Power Spectral ◽  
Single Location ◽  
Draft Gear ◽  
Full Scale Tests

Full scale tests were performed to investigate various aspects of tank car behavior during coupler impacts. A tank car was equipped with 37 accelerometers and an instrumented coupler. Two series of full scale coupler impact tests, comprising 26 impacts, are discussed. In the first series, the tank car was empty. In the second series, the tank car was full. A range of impact speeds was investigated. Accelerometer response and coupler force were measured for each test. Aspects of the tank car response to coupler impacts can be determined by studying the coupler force versus time relationship, Shock Response Spectrum (SRS), and Power Spectral Density (PSD) analyses of accelerations measured on the tank car body. The dominant draft gear load transfer mechanism can be determined from the coupler force vs. time relationship. Accelerations were measured at many locations on the tank car. However, based on preliminary analyses, a single location near the manway was chosen for detailed study. SRS results of accelerations at this location show good correlation with the peak coupler force, although different relationships were observed when the car was empty than when it was full. PSD analyses of empty tank cars have peaks at different frequencies than PSD analyses of full tank cars, so a PSD analysis could be used to determine whether a car is empty or full. Therefore, the combination of SRS and PSD results suggests the possibility of estimating peak coupler forces resulting from yard impacts based on SRS and PSD analyses of accelerations measured at a single location on a tank car.

Deformation characteristics of discontinuous section of quick-hardening concrete tracks under full-scale test

2016 ◽  
Vol 231 (3) ◽  
pp. 255-268 ◽  
Author(s):  
Ilwha Lee ◽  
Yeong-Tae Choi ◽  
Sungho Joh ◽  
Juhwan Um
Keyword(s):  
Load Transfer ◽  
Earth Pressure ◽  
Full Scale ◽  
Elastic Displacement ◽  
Repeated Loading ◽  
Structural Durability ◽  
Scale Test ◽  
Construction Joints ◽  
Full Scale Tests ◽  
Track Irregularities

A quick-hardening concrete track has been developed to convert old ballast tracks into concrete tracks on operating lines. This method has been utilized to convert urban railways since 1997. With recent increases in train traffic and speed, maintaining track irregularities within design criteria has become essential to ensuring safety. On quick-hardening tracks, track irregularities are predominantly caused by irregular settlement around construction joints. These construction joints are inevitable in quick-hardening concrete; however, they create discontinuous sections that can affect the stable running of trains and structural durability. In this study, full-scale tests were performed with quasi-static and repeated loading on both continuous and discontinuous sections in which the earth pressure acting on the trackbed, accumulated settlement, and elastic displacement were measured. The results obtained indicate that construction joints are disadvantageous in terms of load transfer, settlement, and displacement. Additional field observations conducted on the Seoul Metro Line corroborated the results of the full-scale tests. The overall findings strongly suggest that construction joints on quick-hardening concrete tracks would need to be reinforced.

Investigation of planing craft maneuverability using full-scale tests

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.

Full-scale tests of the trash racks of the Kapchagai hydroelectric station

1984 ◽  
Vol 18 (4) ◽  
pp. 166-170
Author(s):  
A. L. Rakhmanova ◽  
I. O. Rybak
Keyword(s):  
Hydroelectric Station ◽  
Full Scale ◽  
Full Scale Tests

THE RULE OF COMBINING A PRIORI AND EXPERIMENTAL INFORMATION IN THE TASKS OF MANAGING TESTS OF COMPLEX TECHNICAL PRODUCTS ACCORDING TO THE BERNOULLI SCHEME

2020 ◽  
pp. 3-13
Author(s):  
Yu. I. Buryak ◽  
A. A. Skrynnikov
Keyword(s):  
Field Experiments ◽  
A Priori ◽  
Field Tests ◽  
Experimental Information ◽  
Full Scale ◽  
Testing Complex ◽  
Series Of Experiments ◽  
Full Scale Tests ◽  
Technical Products

The article is devoted to the substantiation of the procedure for testing complex technical systems to assess the probability of performing the task, taking into account a priori data obtained from the results of modeling, field tests of components and prototypes, operation of analogues, etc. The conditions for the formation of a combined sample consisting of field experiments and experiments counted on the results of modeling are justified. Data uniformity is checked using the Student's criterion. The minimum volume of full-scale tests is determined by the requirement of equality of the amount of Fischer information about the estimated parameter obtained during full-scale tests and at the expense of a priori data A strategy for conducting field experiments is proposed, in which the required quality of evaluating the probability of completing the task is achieved with the minimum possible number of field experiments. At the first stage, a series of experiments with a volume equal to half of the required sample size is performed. At the second stage, the experiments are conducted sequentially with an assessment after each experiment of the requirements for the amount of information about the evaluated parameter and for the uniformity of data. Experiments are terminated when the specified requirements are met, and then a combined sample is formed, which is used to evaluate the probability of the system performing the task. A model example is considered. The estimation of the gain in the number of experiments performed at different probability values was carried out.

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