In most fan systems a single fan is selected for the required system design rating. Various methods of control are employed such as dampers, variable inlet vanes, variable pitch blades, or variable ...

The headline above is a reminder that a fan and a damper, when assembled, become a fan + damper system, which is more than a simple sum of the two individual items of equipment. They may be operated ...

Semi-active dampers were conceived in early 1970s as controllable devices with time-variable dissipative properties. Since then these devices were closely studied, developed and applied.

SAE Transactions, Vol. 109, Section 6: JOURNAL OF PASSENGER CARS: MECHANICAL SYSTEMS JOURNAL (2000), pp. 132-139 (8 pages) A new vehicle suspension control system that enhances vehicle stability and ...