Damper applied to Songle Mahjong Machine
The damper is a device that provides the resistance to motion and reduces the energy of the movement. The use of damping to absorb energy is not a new technology. In the aerospace, aviation, military, gun, automotive and other industries, various dampers (or shock absorbers) have long been used to reduce energy dissipation. Since the 1970s, people have gradually transferred these technologies to structural projects such as buildings, bridges, and railways, and their development has been very rapid. In particular, hydraulic viscous dampers with a history of more than 50 years have undergone extensive experiments, strict examinations, repeated arguments, and especially the long process of earthquake testing before being accepted by the structural engineering community in the United States.