nasa's space power facility vibro-acoustic construction. modal test facility. in addition to the sine vibe table, a fixed-base modal floor sufficient for the 20 ft 6.1 m diameter test article is available. the fixed based modal test facility is a 6 in 150 mm thick steel floor on top of 19 ft 5.8 m of concrete, that is tied to the earth .
gravity concentrates can often contain high grinding steel contents, and so their removal using shaking tables or magnets is used before smelting. during smelting iron can be oxidized using nitre . excessive use of nitre will corrode the smelting pot, increasing both maintenance costs and the risk of catastrophic leaks known as run-aways , or holes in the pot through which the molten charge .
soil liquefaction occurs when a saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress such as shaking during an earthquake or other sudden change in stress condition, in which material that is ordinarily a solid behaves like a liquid.
in the event of a failure of the aircraft's landing gear extension mechanism a backup is provided. this may be an alternate hydraulic system, a hand-crank, compressed air nitrogen , pyrotechnic or free-fall system. a free-fall or gravity drop system uses gravity to deploy the landing gear into the down and locked position. to accomplish this .
in astrodynamics and aerospace, a delta-v budget is an estimate of the total change in velocity delta-v required for a space mission.it is calculated as the sum of the delta-v required to perform each propulsive maneuver needed during the mission. as input to the tsiolkovsky rocket equation, it determines how much propellant is required for a vehicle of given mass and propulsion system.
the gravity recovery and climate experiment grace was a joint mission of nasa and the german aerospace center dlr . twin satellites took detailed measurements of earth's gravity field anomalies from its launch in march 2002 to the end of its science mission in october 2017. the gravity recovery and climate experiment follow-on grace-fo is a continuation of the mission on near-identical .
the earthquake engineering research institute eeri is a leader in dissemination of earthquake engineering research related information both in the u.s. and globally. a definitive list of earthquake engineering research related shaking tables around the world may be found in experimental facilities for earthquake engineering simulation worldwide.