Two semi-active control laws are implemented, one is based on velocity-feedback (denoted as SQDCL) and the other is based on force-feedback (denoted as SPCL); the passive control case is also studied for comparison.
Brief parametric studies suggest that the curved inserts can be employed as a tool for the passive control of wave propagation in fluid-filled pipes, and their stop band characteristics may be tailored to reach desirable attenuation levels in prescribed frequency ranges.
Conventional base isolation devices such as lead rubber bearings are used for the passive control design.
The final result, once the input parameters of the vibration control devices are properly designed, is an assembled structural system in which the glazing façade works as passive control system for the primary structure.
The applied tensile force, if needed, is to produce a net thrust below a critical level for buckling, and the boundary damping is introduced by a frictional force and a braking torque, which may be regarded as a passive control and depends linearly on the transverse and angular velocities of the controlled edge.
Fourteen healthy male subjects between 10 and 16 years trained a visuospatial n-back task over 3 weeks (30 min daily), while 15 individuals of the same age range served as a passive control group.
On the other hand, permeable coverings can be considered as a passive control method of indoor conditions and, consequently, have implications in the perception of indoor air quality, local thermal comfort, and energy savings.
A third clinic within the safety-net organization was selected to serve as a passive control (Usual Care).
The attractiveness of semi-active control systems mainly relies on their assumed "inherent stability", which makes them almost as reliable and fault-tolerant as passive control systems.
Permeable coverings have been demonstrated to be an effective solution as a passive control method for indoor air conditions, especially in the summer season and, consequently, are an energy saving technique.
