How Much Do You Know About Vibration Dampers

The use of damping to absorb energy and shock is not a new technology. Various dampers (or shock absorbers) have been used to reduce vibration and energy in aerospace, aviation, military industry, guns, automobiles and other industries. 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, the hydraulic viscous damper, which has a history of more than 50 years, has undergone a large number of experiments, rigorous review, repeated demonstrations, and a long process of seismic testing before being accepted by the structural engineering community in the United States. The process shown in the following process 1 summarizes it

Development process in the United States:

·Widely used in aerospace, aviation, military, machinery and other industries, with decades of successful application history

·In the 1980s, a large number of experimental studies have been conducted in the two earthquake research centers in the east and west of the United States, and dozens of relevant papers have been published

·In the 1990s, the National Science Foundation of the United States and the Civil Engineering Society organized two large-scale joints. The comparative experiments conducted by a third party gave authoritative test reports for the reference of professors and engineers.

·On the basis of affirming the above results, it has been standardized and reviewed by almost all relevant agencies, and the application methods have been affirmed and stipulated

·The management department passed hundreds of practical applications of structural engineering. These structural projects have successfully passed the test of earthquakes, strong winds and other disasters, and are very successful.

Engineering structure damping and dampers

In the 20th century, especially in the past 20 to 30 years, people have made great efforts to improve the anti-vibration ability of buildings and achieved remarkable results. The most proud of this achievement is the "structural protection system". People have jumped out of the traditional concept of strengthening beams, columns, and walls to improve their anti-vibration ability, combined with the dynamic performance of the structure, ingeniously avoiding or reducing the damage of earthquakes and wind. Base Isolation, various energy absorbing and dissipating systems using dampers, mass resonance damping systems (TMD) on the roofs of high-rise buildings, and active control (Active Control) damping systems have all moved forward. Engineering practice. Some have become indispensable protective measures to reduce vibration. Especially for unpredictable earthquakes and multi-dimensional vibrations whose failure mechanism is not very clear, the protection system of these structures is even more important.

The least controversial of these structural protection systems is the use of dampers to absorb this unpredictable seismic energy. The use of damping to absorb energy and shock is not a new technology. Various dampers have been used to reduce vibration and energy in aerospace, military, guns, and automobiles. Since the 1970s, people began to gradually transfer these technologies to construction, bridges, railways and other projects, and their development was very rapid. By the end of the twentieth century, nearly 100 structural projects around the world had used dampers to absorb energy and reduce shocks. By 2003, Taylor alone had installed 110 buildings, bridges or other structures around the world.

Taylor Taylor has undergone a large number of tests in the aerospace and military industries since 1955. It was the first experiment to apply this technology to structural engineering. A large number of shaking table model experiments and computer analysis were performed at the U.S. Earthquake Research Center, and several reports were published. Ten related papers. The key to structural dampers is durability and stability under time and temperature changes. Taylor's dampers have undergone long-term tests and various comparative analyses. It is difficult for other companies' products to look back. The formulation of the corresponding design specifications in the United States is based on Taylor's dampers. Its products have advanced technology, reasonable and reliable structure, high technical transparency, and can manufacture dampers suitable for various purposes according to the requirements of designers. Each product undergoes the most rigorous testing before leaving the factory and gives a hysteresis curve. Taylor Taylor has accumulated a lot of practical experience from the practical applications of more than 130 projects and 32 bridges in the world.

Classification of dampers:

Damper: used to reduce vibration;

Snubber: used for anti-vibration, allowing movement at low speed, blocking when the speed or acceleration exceeds the corresponding value, forming a rigid support.

1. Introduction to the development process of dampers

As we all know, the various friction and other obstacles that attenuate free vibration are called damping. The "special" components placed on the structural system can provide resistance to motion and consume motion energy. We call it a damper.

The use of damping to absorb energy and shock is not a new technology. Various dampers (or shock absorbers) have been used to reduce vibration and energy in aerospace, aviation, military industry, guns, automobiles and other industries. 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, the hydraulic viscous damper, which has a history of more than 50 years, has undergone a large number of experiments, rigorous review, repeated demonstrations, and a long process of seismic testing before being accepted by the structural engineering community in the United States. The process shown in the following process 1 summarizes its development process in the United States:

·Widely used in aerospace, aviation, military, machinery and other industries, with decades of successful application history

·In the 1980s, a large number of experimental studies have been conducted in the two seismic research centers in the east and west in the United States, and dozens of related papers have been published

·In the 1990s, the National Science Foundation of the United States and the Civil Engineering Society organized two large-scale alliances. The comparative experiments conducted by a third party gave authoritative test reports for the reference of professors and engineers.

·On the basis of affirming the above results, it has been standardized and reviewed by almost all relevant agencies, and the application methods have been affirmed and stipulated

·The management department passed hundreds of practical applications of structural engineering. These structural projects have successfully passed the test of earthquakes, strong winds and other disasters, and are very successful.