Question Washout in a 3DOF Motion G-Seat

Sorry noob question follows... I'm doing a lot of reading on this site and trying to apply what I'm learning.

I built this 3D motion G seat....


https://makers.bergison.com/introduction

The seat has flaps that simulate g forces on your legs and back as well as tighten the belts as the seat moves. For example as you roll it applies pressure to your thigh and that pressure remains as long as you are in the roll, even after the seat stops moving. The flaps/belt cannot be controlled independently from the chair.

I have the chair configured for roll, surge and heave (there are two motors in the back and one in the front).

My question is this... since the chair is reacting to g forces and applying pressure as the seat moves, washout seems like it would be counter productive.. If I use washout then the chair will return to neutral but in doing so will remove the pressure of the movable surfaces which i dont think would be correct. i should feel that pressure as long as I'm in the turn for example. Am i right in thinking that washout would be counter productive in this chair?

You are correct; Washout is not normally useful for a G-Seat. The advantage of the G-Seat over a motion platform is the ability to have sustained pressure for Surge, Sway and Heave movements. For a motion platform, these movements are limited to (usually) less than 1 second of force before you run out of room to sustain the force. Without a G-Seat, you are usually forced to mix in incorrect motion movements such as Roll and Pitch to allow for some sustained force.

The idea behind washout is to allow for a 2nd movement after the limits of the motion platform have been reached. Washout should be as fast as possible without the movement being perceptible. For example, in a 6 DOF motion platform, on turning left around a corner, you want the platform to sway to the left (Thereby momentum pushing your body into the right hand side of the seat). If you then take another left soon after, the platform has no more room to Sway unless you have imperceptibly returned it to the centre to allow another movement. Washout is most effective in VR where there are no visual clues that the platform has moved.

Washout is not required for the G-Seat as it can maintain constant pressure for as long as required.

Thank you for your reply... a follow-on question:

I would assume there is still value in high pass and low pass filters to smooth out the motion? The seat still moves in addition to applying the pressure with the movable flaps.

Yes, these can be useful so that the panels and belts don't 'jitter', smoother movements usually work best for most G-Seat movements other than perhaps getting a vibration feel from the heave effect in some cases.