We investigated muscle activity, ground reaction forces, and center of mass (CoM) acceleration in two different postural behaviors for standing balance control in humans to determine whether common neural mechanisms are used in different postural tasks. We compared nonstepping responses, where the base of support is stationary and balance is recovered by returning CoM back to its initial positi...

Planar linear motors (Sawyer motors) have been used in industry as open-loop stepping motors, but their robustness and versatility has been limited. Using a sensor recently integrated into such a motor, a closed-loop 3-DOF controller has been implemented. The software-based control system consists of a commutator for computing ampli er currents from actuator forces, a force resolution function ...

Usage of flywheel energy storage system (FESS) is a common method for frequency regulation due to its high power injection capacity and long life time. FESS is equipped by two back-to-back inverters including grid-side inverter and machine-side inverter. In conventional method, the machine-side inverter sets the active power and machine flux while grid-side inverter sets the reactive power and ...

Background: Most biomechanical studies in populations with low back pain have examined level gait or stationary tasks. This study investigates step negotiation a subgroup of individuals pain. Methods: Surface electromyography and kinetic data were collected 22 subjects. Results: Vertical ground reaction force rise-time was slower participants when leading the left leg they had delayed muscle on...

We investigate analytically as well as numerically Burgers equation with a high-order nonlinearity (i.e., ut = νuxx−unux+mu+h(x)). We show existence of an absorbing ball in L2[0,1] and uniqueness of steady state solutions for all integer n ≥ 1. Then, we use an adaptive nonlinear boundary controller to show that it guarantees global asymptotic stability in time and convergence of the solution to...

The displacement tracking performance of the electro-hydraulic servo actuator is critical for hydraulic active suspension control. To tackle problem slow time-varying parameters in existing dynamics model, a nonlinear adaptive back-stepping control (ABC) approach adopted. Simultaneously, ABC are difficult to configure, resulting poor effect. An enhanced particle swarm optimization (PSO) integra...