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The energy loss of friction damper vibration system is mainly friction loss. According to the principle of energy conservation, the total energy dissipation of machinery is equal to the work of friction, and the friction damping loss coefficient can be defined. However, the friction operation of the free vibration system gradually decreases with the passage of time, and the motion characteristics of the system are different. Therefore, the energy loss is taken to calculate the loss coefficient in a cycle.
In the 20th century, especially in the past 2 ~ 30 years, great efforts have been made to improve the earthquake resistance of buildings and remarkable results have been achieved. In this achievement, we should be proud of the "structural protection system". People get rid of the traditional concept of beam, column and wall to improve the ability to resist vibration, and combine the dynamic performance of the structure to skillfully avoid or reduce the damage of earthquake and wind. Base isolation, damper energy absorption, energy consumption system, mass resonance damping system (TMD) and active control damping system of high-rise building roof have all entered engineering reality. Some have become indispensable protective measures to reduce vibration. Especially in the multi-dimensional vibration in which the failure mechanism is not clear, the protection system of these structures is more important.
Among these friction damper structural protection systems, the less controversial and harmless system is to use dampers to absorb unpredictable seismic energy. Using damping to absorb energy is not a new technology. A variety of dampers can be used to reduce personnel in aerospace, military, gun, automobile and other industries. Since the 1970s, people have gradually begun to transform these technologies into construction, bridge, railway and other projects, and their development is very rapid. By the end of the 20th century, more than 100 rescue projects around the world had used dampers to absorb energy shocks. As of 2003, only Taylor has set up 110 buildings, bridges or other structures around the world.
Since 1955, after the long-term test of the universe and military industry, the technology of friction damper has been applied to structural engineering. A large number of shaking table model experiments, computer analysis and dozens of related papers have been published at the U.S. earthquake research center. The key of structural damper is the stability brought by durability, time and temperature changes. Taylor's damper has been tested for a long time and compared with other companies' products. The corresponding design specifications in the United States are based on Taylor's dampers. With advanced technology, reasonable structure and high technical transparency, the damper can be made for various purposes according to the requirements of designers. Each product is strictly tested before leaving the factory, providing hysterical curves. Taylor has accumulated a lot of practical experience in the practical application of more than 130 projects and 32 bridges in the world.