Active seat suspension systems including systems with non-back-drivable actuators

An active suspension system configured to support a vehicle seat relative to a floor of a vehicle, the active suspension system comprising:

• a first non-back-drivable actuator;
• a second non-back-drivable actuator, wherein the first non-back-drivable actuator and the second non-back-drivable actuator are configured to be operated cooperatively to control both roll and heave of the seat;
• and
• a first rotatable rocker arm configured to be attached to the vehicle seat and a second rotatable rocker arm configured to be attached to the vehicle seat, wherein the first non-back-drivable actuator includes a first worm engaged with a first worm gear that is rotatably fixed to the first rotatable rocker arm, and wherein the second non-back-drivable actuator includes a second worm engaged with a second worm gear that is rotatably fixed to the second rotatable rocker arm.