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The graph shows the effect of a tuned mass damper on a simple spring–mass–damper system, excited by vibrations with an amplitude of one unit of force applied to the main mass, m 1. An important measure of performance is the ratio of the force on the motor mounts to the force vibrating the motor, F 0 / F 1 .
There are many types of physical devices that can act as inertia dampers: Stockbridge damper - absorbs resonant wave motions in wire and support cables, seen on high voltage power lines. [2] Shock absorber - motion redirected as heating of viscous oil forced through a restrictive passage [3]
Direct digital control is the automated control of a condition or process by a digital device (computer). [1] [2] Direct digital control takes a centralized network-oriented approach. All instrumentation is gathered by various analog and digital converters which use the network to transport these signals to the central controller.
The oil burner nozzle is usually mounted in the front of the firebox, protected by a hood of firebrick, and aimed at the firebrick wall below the firebox door. Dampers control air flow to the oil fire. Schematic of a later steam locomotive firebox boiler, with firebox to the left and indicatively showing two superheater elements to the right.
In new and upgraded systems, expansion tanks are designed in and installed [2] more frequently than in the past. In the UK, prior to the use of sealed expansion tanks, "open" tanks were installed in the roof space to accommodate the water's expansion [citation needed]; these had the disadvantage of being exposed to cold air in the roof space ...
Neglected by modern architects in the latter half of the 20th century, the early 21st century saw them used again to increase ventilation and cut power demand for air-conditioning. [3] Generally, the cost of construction for a windcatcher-ventilated building is less than that of a similar building with conventional heating, ventilation, and air ...
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