Some knowledge points of the damper
Release time:
2021-03-26 12:09
Source:
tuned mass damper (TMD) consists of a mass, spring and damping system. Generally, the vibration frequency is adjusted to the frequency close to the main structure, and the resonance characteristics of the structure are changed to achieve the purpose of vibration reduction. FM mass damper is a kind of structure passive tuning vibration control device.
The passive tuning vibration reduction control system consists of a structure and a substructure attached to the main structure. The additional substructure has mass, stiffness and damping, so the natural frequency of the substructure can be adjusted to be as close as possible to the fundamental or excitation frequency of the host structure. When the main structure vibrates under excitation, the sub-structure will generate inertial force opposite to the vibration direction of the main structure, thereby attenuating and controlling the response of the main structure. The mass of the substructure can be either a solid mass or a liquid mass.
Tuned Liquid Damper (TLD) is a passive energy dissipation device, which has been widely studied and applied in recent years. The tuned liquid damper provides vibration damping by utilizing the dynamic lateral forces generated by the liquid in the stationary tank during vibration. It has the advantages of simple structure, convenient installation, good automatic activation performance, and no need to start the device. It can also be used as a water supply tank.
Tuned Liquid Column Damping System (TLCD) uses an auxiliary vibration system to eliminate the vibration of the main structure. The auxiliary vibration system consists of the liquid in the cylindrical container, the restoring force generated by gravity acting on the liquid, and the damping effect generated by the holes in the container.
The viscous liquid damper is a stiffness-free, velocity-dependent energy dissipation device that uses the viscosity of the liquid to provide damping to dissipate vibration energy.
One: A damper that consumes energy when the liquid generates a certain flow rate in a closed container. In such a damper, the piston forces the viscous liquid through the orifice for a short time, creating a high pressure. In addition, the internal process design requirements of this damper are high. Two: a damper in which a viscous liquid produces a certain displacement in an open container to consume energy. Such dampers require the viscous liquid to be as thick as possible to obtain large damping. Therefore, the choice of viscous liquid material is a key issue in the design. One common form of such a viscous damper is a viscous damping wall.
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