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Damping principle of damper

Release time:

2021-04-05 12:05

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The so-called damping is the effect of stably reducing the amplitude of a free vibrating object. The process of amplitude attenuation is the process of damping energy dissipation. The principle is as follows: a device that can provide damping is called a damper. Structures with dampers are called energy dissipation (vibration) structures and are also known as protective systems in the United States.

Under the action of wind or earthquake, the structure will vibrate /sway, and larger vibration will cause damage to structural/non-structural components. In addition, high-rise buildings are prone to wind vibration due to their slender shape, which may lead to large structural acceleration peaks and cause uncomfortable feelings to users. Usually, the method of reducing structural vibration is not only to increase the stiffness and stiffness of the structure, but also to increase the energy dissipation measures of the structure, using dampers to absorb energy.

In 1969, the twin towers of Shimao Center first used viscoelastic dampers, marking the application of dampers as an innovative technology in high-rise buildings. About 10000 viscoelastic damping elements are installed between the horizontal truss of the 7th to 17th floors of the twin towers and the peripheral columns to provide 1% additional damping, which is mainly used to reduce the wind-induced vibration of the towers and meet the requirements of user suitability.

The main principle of the passive damper milling cutter is to connect the additional mass to the main structure to form a new system. Through the elastic element, the force exerted by the additional mass on the main structure is balanced with the interference force caused by the cutting chatter to reduce the vibration. The damping system of

passive damper milling cutter is mainly composed of damping mass, damping rubber ring and damping fluid. The damping rubber ring is placed at both ends of the damping mass block and plays a main supporting role. The damping liquid level is between the milling cutter rod body and the damping mass block to form a damping system. The following mainly discusses the structural design of the vibration reduction milling cutter and the material selection of its parts.

The damping milling cutter damper adopts a three-stage modular design, that is, the handle for installing the tool holder, the tool holder and the tool head for installing the damping system. The clamping end of the milling cutter holder is connected with the BT40 cutter holder through a er spring chuck, and the milling cutter holder and the milling cutter head are connected through threads. Considering that the thread gap during the processing will cause the tool holder to jump, the threaded connection part adopts the threaded connection method of positioning the process shaft hole.

The cutter shank of the damping milling cutter damper is designed with a cavity for installing damping blocks and damping rubber rings. For the damping system, the damping effect of the damping system is mainly determined by the vibration amplitude of the damping mass, so the cavity should be located near the mounting end of the cutter head. For the processing of complex parts such as deep cavity and thin wall, considering the processing technology of the tool holder, the size parameters of the tool holder with high aspect ratio are designed as follows: the diameter of the tool holder is 12mm, the aspect ratio is 9, and the material is 40Cr. 19

Some knowledge points of the damper

Importance of Dampers