Artificial gravity was a means of simulating gravity.
The Fourth Doctor speculated that Deepcity's artificial gravity was created by a layer of stabilized neutronium on the floor of the cavern inside the asteroid where it was hidden. (PROSE: A Device of Death)
The TARDIS' gravitic anomaliser generated a localised field of artificial gravity around the outside of the vessel. The Fourth Doctor used the gravitic anomaliser to help a Skonnan ship escape the gravity field of a nascent black hole. (TV: The Horns of Nimon)
The Byzantium had artificial gravity. On Alfava Metraxis in the 51st century, the Eleventh Doctor shot a gravity globe floating above him and ordered his companions to jump. This caused them to land on the Byzantium above them. (TV: The Time of Angels / Flesh and Stone) The failure of this gravity caused the Weeping Angels pursuing the Doctor, Amy Pond and River Song to fall into a crack in the universe. (TV: Flesh and Stone)
Parallel universe Edit
In a parallel universe in which Great Britain was a fascist state known as the Republic of Great Britain, the Republican Security Forces battled the Bannermen in Wales, from whom they obtained artificial gravity and fast drive technology. (PROSE: The Face of the Enemy)