Indeed, due to small unbalances in the rollers and in the mechanical parts of the motor, due to a lack in rigidity of the structure, vibrations are generated and create small oscillations of the centre of mass of the treadmill, which in turn induce noise on the force measurements.
It was found that a small mass unbalance aft of the elastic axis significantly fosters the system instability and affects the heaving and pitching motion amplitudes.
In particular, eccentricity of the elastic centre and small downstream mass unbalance can be introduced as solutions aiming at optimal operative ranges.
This study has limitations as single group pre-post study, small population, the unbalance between men and women.
Our preliminary results indicate that for smaller amount of unbalance the rotor swings at the bottom of the bearing, the more the unbalance increases, other dynamical behavior occur and some can be extremely harmful, since the rotor can be lifted from the contact state and return, starting to impact innumerable times without reaching a steady state.
Saving that is too high or too low can unbalance an economy.
Finally, the ratings and losses of the SGSC and the injected transformer are discussed and the effectiveness of the proposed control scheme is verified by the simulation results of a 2 MW DFIG-based wind turbine with SGSC under steady state and small transient grid voltage unbalance.
These are extreme examples but smaller circumstances can dangerously unbalance a play, such as when the company has just been told that their run is to be cut short, or when people are dashing in from a traffic jam or an Andy Murray fifth-set cliff-hanger.
Practically, small but fast changing power unbalance may still exist after re-dispatching and it is hard to predict or manually handle.
They exhibit very good speedup behavior and low load unbalancing.
