Search results
Results From The WOW.Com Content Network
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 .
Shanghai Tower tuned mass damper, known as the Shanghai Eye, located on floor 126. During the day, it is lit by a skylight on the building's roof. In September 2011, Mitsubishi Electric announced that it had won a bid to construct the Shanghai Tower's elevator system.
They are known for their modular construction techniques including the Mah-LeMessurier System for precast concrete in high-rise housing, the Staggered Truss System for high-rise steel structures, and the tuned mass damper used to reduce tall building motion. [1] One of the best known uses of the damper is the John Hancock Tower in Boston.
Additional stabilizer elements such as tuned mass dampers also require mechanical floors to contain or service them. This layout is usually reflected in the internal elevator zoning. Since nearly all elevators require machine rooms above the last floor they service, mechanical floors are often used to divide shafts that are stacked on top of ...
A Stockbridge damper is a tuned mass damper used to suppress wind-induced vibrations on slender structures such as overhead power lines, [1] long cantilevered signs [2] and cable-stayed bridges. The dumbbell-shaped device consists of two masses at the ends of a short length of cable or flexible rod, which is clamped at its middle to the main ...
The distinction is significant since dampers reduce the vibration amplitude by converting the vibration energy into heat. Absorbers store the energy and return it to the vibration system at the appropriate time. [5] Centrifugal pendulum absorbers like tuned mass absorbers are not part of the force/torque flow.
The tuned mass damper has a major effect on the stability of the structure, so an emergency backup generator was installed and extra staff was assigned to ensure that it would keep working reliably during the structural reinforcement. The city had plans to evacuate the Citicorp Center and other surrounding buildings if high winds did occur. [2]
A slosh tank is a passive tuned mass damper. In order to be effective the mass of the liquid is usually on the order of 1% to 5% of the mass it is counteracting, and often this requires a significant volume of liquid. In some cases these systems are designed to double as emergency water cisterns for fire suppression.