Design and calibration of a 2D airjet device for human motor control study

Describe the design and calibration of a 2D airjet force perturbation device for identification of human joint mechanical properties based on the authors' successful construction of a 1D airjet device. The key advantage in these devices is that they do not impose any motion constraints on human joint movements. The authors' design combines two airjet actuators in a plane. They present signal processing methods to eliminate from the force measurement the ringing due to the resonance of the force sensor and the inertia force due to the airjet motion.