Performance measurement of a real gear has always been the concern of manufacturers and operators, either to assess the differences with the values estimated in the design, or to measure the impact of changes, for example. The line testing of steam locomotives with dynamometer car and engine-brake were expensive and still raised the insurmountable problem of the exact conditions of environment and repeatability. Hence the realization of this test bed that allowed complete control of stationary conditions and operating parameters of the locomotives. The principle was similar to that of the dynamometer used car. The engine under test is placed on rollers and harnessed to a fixed point. There are so many rollers as driving axles and each is coupled to a hydrodynamic brake Froude. These brakes designed to absorb the power generated by the machine allow for example the holding of a constant speed. The tractive effort is measured by a dynamometer placed between the drawbar of the locomotive and a fixed point of the building frame of the bench. We can measure directly, the traction and the fictional traveled (wheel rotation) for a given time: for the calculation, we get speed, work and power developed by the engine being tested. In addition, other parameters are measured as: the temperatures and pressures, the opacity of smoke and water consumption and fuel. If early in its commissioning, the test bench Vitry could also accommodate testing of locomotive diesel railcar, it was modernized in the late 1950s to accommodate also testing electric locomotive. Built on a concrete foundation of more than 1,000 tons, the support rollers and brakes extended over 24 meters. There were eight rolls of longitudinal position was adjustable (nearest mm) to position themselves above each axle of the locomotive. Each roll of 1.3 m in diameter could support a load of 30 tons and the maximum speed was 800 rpm (equivalent to 196 km / h). The rollers under the axles remained passive while the rollers under the axles were hampered. The maximum possible driving axles was 6. All six Froude brakes, shock absorbers, were able to withstand a total power of about 8400 kilowatts which indicates what the power limit of gear allowed. On this principle, but with more limited features, there was already the bench tests of the Pennsylvania Railroad Altoona (1904), Swindon (1904) in England and Grunewald (1930) in Germany. In his opening Vitry became the bench most powerful and most advanced worldwide. Sir Nigel Gresley be sent for testing many of its locomotives and had consistently advocated the idea of a school comparable in England: thus was born the center Rugby commissioned in 1948. It was inaugurated July 27, 1933. Since its inception to its dismantling in the late 1990s, more than a hundred French locomotives (and a few foreign) were tested on the dyno Vitry. It is from 1958 that was mainly dedicated to testing of electric motor and a few units and railcars.This remarkable technical facility could be part of the historical heritage of the station, but nothing remains today except for a scale model of one tenth of the train to the city of Mulhouse. Note however that still exists in Vitry, since the 1960s, a department tests and the SNCF workshops in 1999 and that was what created the Agency for rail tests (EFS) of SNCF dealing with essentially the brake, structures and comfort of vehicles. Copyright Text is available under Creative Commons Attribution Share-Alike, other conditions may apply. See Terms of Use for more details and credits graphics. If reused texts of this page, see how to cite authors and include the license. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc.., Charitable organization governed by section 501 (c) (3) tax United States. ..

Best Fitness BFFID10 FID Bench was bought by located in ,

Bowflex SelectTech Adjustable Bench Series 5.1 was bought by located in ,

Marcy Utility Bench was recommended by located in ,

Marcy Deluxe Utility Bench was bought by located in ,

Bowflex SelectTech Adjustable Bench Series 3.1 was added to shopping list by located in ,

Marcy Deluxe Utility Bench was recommended by located in ,

Marcy Deluxe Utility Bench was bought by located in ,

Marcy SB222 4-Position Utility Bench was added to shopping list by located in ,

Universal Decline Bench was rated 5 by located in ,