CN203626078U - Ultra-low frequency modulation quality damper - Google Patents

Abstract

The utility model discloses an ultra-low frequency frequency modulation mass damper. It includes a heavy ball and a spring, the lower end of the heavy ball is connected with the spring, the heavy ball and the spring are placed in an airtight container, the spring is fixed at the lower end of the airtight container, and the airtight container is filled with oil. The heavy ball of the utility model is a hollow metal sphere, which can realize that the apparent density of the weight is slightly larger than the density of the surrounding liquid medium; the ratio of the apparent density of the heavy ball of the utility model to the density of the oil can be adjusted, thereby obtaining Frequency-modulated mass dampers that meet various ultra-low frequency structural vibration damping requirements.

Description

A kind of ultralow frequency tuned mass damper, TMD

Technical field

The utility model relates to a kind of mass damper, is specifically related to a kind of ultralow frequency tuned mass damper, TMD.

Background technology

Very easily under wind action, low order occurring for the bridge of towering building and super-span significantly vibrates.In order to suppress the vibration of this class formation, a lot of super highrise buildings and Longspan Bridge design and installation huge tuned mass damper, TMD (being called for short TMD) carry out vibration damping.Because structural vibration frequency is low, cause the spring static(al) distortion of tuned mass damper, TMD large, therefore tuned mass damper, TMD must take a large amount of spaces, and along with the further reduction of structure frequency, the space that tuned mass damper, TMD takies will be larger.This large space takies and makes serious waste of resources, has improved vibration damping cost.

The intrinsic frequency of tuned mass damper, TMD is:

$f=\frac{1}{2\mathrm{\π}}\sqrt{\frac{k}{m}}=\frac{1}{2\mathrm{\π}}\sqrt{\frac{g}{{\mathrm{\δ}}_s}}---\left(1\right)$

Wherein k is spring rate, and m is heavy ball quality, and g is acceleration of gravity, δ _sfor the static(al) distortion of spring under heavy ball Action of Gravity Field.Gained knowledge from structural dynamic: when the vibration frequency of structure is tuned mass damper, TMD intrinsic frequency while approaching, can realize the vibration damping to structure.For the structure of ULF vibration, for the intrinsic frequency that makes tuned mass damper, TMD meets the demands, its heavy ball quality is large, and spring rate is little, and the spring static(al) distortion that heavy ball causes is very large, need to occupy large quantity space.

Summary of the invention

In order to reduce costs, reduce taking of space, the utility model provides a kind of ultralow frequency tuned mass damper, TMD simple in structure.

The technical scheme that the utility model solves the problems of the technologies described above is: a kind of ultralow frequency tuned mass damper, TMD, comprise heavy ball, spring, described heavy ball lower end is connected with spring, and described heavy ball and spring is placed in closed container, spring is fixed on closed container lower end, in described closed container, fills oil.

Above-mentioned ultralow frequency tuned mass damper, TMD, described heavy ball is hollow.

Heavy ball is processed into hollow ball, spring and heavy ball are placed in to closed container, produce a common tuned mass damper, TMD.

Fill whole container with oil, oil, for heavy ball provides buoyancy and damping force, by changing the profile of heavy ball, can obtain the damping force size needing.

Reduce spring rate, increase heavy ball quality, can obtain the tuned mass damper, TMD with very low intrinsic frequency.Surrounding liquid medium add the intrinsic frequency that does not change displacement meter, as the apparent density ρ of heavy ball ₁when=m/V is only bigger than the density of surrounding liquid medium, the distortion of spring static(al) will be very little, as long as the apparent density of heavy ball enough approaches with the density of enclosing liquid medium, just can obtain the tuned mass damper, TMD of ultralow intrinsic frequency, meet the vibration damping requirement to superlow frequency vibrating structure.

Compared with prior art, the beneficial effects of the utility model are:

(1) tuned mass damper, TMD that the utility model provides is simple in structure, can meet the vibration damping requirement to superlow frequency vibrating structure;

(2) heavy ball of the present utility model is hollow metal spheroid, and the apparent density that can realize weight is more bigger than the density of surrounding liquid medium;

(3) apparent density of heavy ball of the present utility model can be adjusted with the ratio of oily density, thereby can obtain the tuned mass damper, TMD that meets the requirement of various ultralow frequency structural vibration vibration damping;

(4) weight profile of the present utility model also can change according to actual conditions, to obtain the damping force size needing.

Accompanying drawing explanation

Fig. 1 is theory structure schematic diagram of the present utility model.

The specific embodiment

Below in conjunction with drawings and Examples, the utility model is described further.

As shown in Figure 1, the utility model comprises heavy ball 1, spring 2, and heavy ball 1 lower end is connected with spring 2, and heavy ball 1 and spring 2 are placed in closed container 3, and spring 2 is fixed on closed container 3 lower ends, fills oil 4 in closed container 3.Oil 4, for heavy ball 1 provides buoyancy and damping force, by changing the profile of heavy ball 1, can obtain the damping force size needing.Heavy ball 1 is hollow, by adjusting the size of the hollow ratio accounting for of heavy ball 1 and heavy ball 1, adjusts the ratio of apparent density with the density of oil 4 of heavy ball 1, thereby can obtain the tuned mass damper, TMD that meets the requirement of various ultralow frequency structural vibration vibration damping.

Claims (2)

1. A mass damper for ultra-low frequency frequency modulation, comprising a heavy ball and a spring, the lower end of the heavy ball is connected with the spring, and it is characterized in that: the heavy ball and the spring are placed in an airtight container, and the spring is fixed on the lower end of the airtight container, so Fill the airtight container with oil. 2. The ultra-low frequency FM mass damper according to claim 1, characterized in that: the heavy ball is hollow.

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