Telescopic actuator, actuating system and motion simulating apparatus

An actuating system comprising:

• a telescopic actuator comprising a plurality of telescopic segments, a first port and a second port, wherein the telescopic segments comprise at least a first segment having a first hollow cavity, and a second segment having a second hollow cavity, the second segment being slidably connected to the first segment through the first hollow cavity, the first hollow cavity and the second hollow cavity being insulated from each other, the first port being configured to flow fluid into and out of the first hollow cavity, and the second port being configured to flow fluid into and out of the second hollow cavity;
• and
• a pressure source respectively connected to the first port and the second port via a first conduit and a second conduit;
• wherein the second segment has an end that is located inside the first hollow cavity and has a first end surface and a second end surface facing opposite directions, the first end surface being configured to contact with a fluid inside the first hollow cavity, the second end surface being configured to contact with a fluid inside the second hollow cavity, and the pressure source being operable to create different fluid pressures in the first hollow cavity and the second hollow cavity so that the second segment is in a floating state and is movable in an extending direction in a stop-and-go manner.