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Vertical frequency adjustment mass damper for model test and design method of vertical frequency adjustment mass damper

A frequency modulation mass damping, model test technology, applied in instruments, measuring devices, vibration testing, etc., can solve the problems of damper friction sensitivity, small mass, change of damper dynamic characteristics, etc., to achieve easy installation, simple design, and reduce motion energy effect

Inactive Publication Date: 2017-02-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the dynamic characteristics of the large-span space structure and the scale of the model, the frequency required for the damper is high (generally 10-30Hz), and the mass is small (related to the scale of the model and the quality of the design)
This makes the damper very sensitive to friction, and a small amount of friction may greatly change the dynamic characteristics of the damper, making it unable to meet the TMD shock absorption principle
At present, there is still a relatively lack of an effective vertically tuned mass damper for model tests

Method used

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  • Vertical frequency adjustment mass damper for model test and design method of vertical frequency adjustment mass damper
  • Vertical frequency adjustment mass damper for model test and design method of vertical frequency adjustment mass damper
  • Vertical frequency adjustment mass damper for model test and design method of vertical frequency adjustment mass damper

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Effect test

Embodiment 1

[0030] A vertically tuned mass damper for model testing, such as Figure 1-5 As shown, it includes the upper top plate 1, the lower bottom plate 7 and the mass block 2 between the top plate 1 and the bottom plate 7. The upper end of the top plate 1 is provided with a bolt 11 connected with the large-span structural model. The bolt 11 is equipped with two 12 nuts, the mass block 2 is a square, made of solid iron, the top plate 1 and the bottom plate 7 are connected by four connecting screw rods 3 arranged between them, and the connecting screw rod 3 is a cylindrical long rod provided with external threads. There are corresponding nuts, and the distance between the top plate 1 and the bottom plate 7 is adjusted by connecting the screw rod 3 and the nuts. The vertical frequency modulation mass damper is provided with a vertical linear track 4, the linear track 4 is fixedly connected with the top plate 1 and the bottom plate 7, and a plurality of springs are respectively arranged ...

Embodiment 2

[0032] The design of the mass block and the spring in the vertical frequency modulation mass damper adopts the following methods:

[0033] (a) According to the expected damping effect and the local pressure capacity of the suspension of the large-span structural model, determine the mass m of a single damper mass block TMD , and then determine the size of the mass block and the size of the damper;

[0034] (b) Determine the frequency f of the long-span structural model to be controlled TMD ;

[0035] (c) According to the formula k TMD = m TMD (2·π·f TMD ) 2 / N determines the stiffness coefficient of each spring, where N is the number of spring elements, which is determined according to the actual situation, and N is taken as an even number to make the spring arrangement symmetrical;

[0036] (d) According to the formula k TMD =Gd 4 / (8D 3n), choose a spring that meets the stiffness, size and other requirements, where G is the shear modulus of the spring, d is the diam...

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Abstract

The invention relates to a vertical frequency adjustment mass damper for a model test and a design method of the vertical frequency adjustment mass damper. The vertical frequency adjustment mass damper comprises a top plate, a bottom plate and a mass block. The top plate and the bottom plate are connected through connection threaded rods. The vertical frequency adjustment mass damper is provided with straight tracks which are fixedly connected with the top plate and the bottom plate. Springs are arranged between the top plate and the mass block as well as between the bottom plate and the mass block. The mass block is connected with sliding blocks which slide up and down along the straight tracks. The mass block makes simple harmonic motion along the straight tracks under the action of the springs. The vertical frequency adjustment mass damper is concise is design, the mass of an additional device is low, a bolt is arranged on the top plate, and thus mounting and dismounting are convenient; the number of the springs can be increased or decreased according to requirements, mounting and dismounting are easy and fast, positioning is symmetrical and accurate, and the model test requirements are met; and the side faces of the mass block are installed on the straight tracks, the gravity is borne by the compression springs, the friction force is small during vertical reciprocating high-frequency motion, influences on the frequency of the damper can be neglected, and the accuracy of frequency adjustment of the vertical frequency adjustment mass damper is guaranteed.

Description

technical field [0001] The invention relates to the field of building structure model shock absorption tests, in particular to a vertical frequency modulation mass damper for model tests and a design method thereof. Background technique [0002] With the needs of economic and urban construction development, the span and scale of buildings and bridges are getting larger and larger. Long-span structures are commonly used in sports, conference and exhibition and airport buildings, as well as long-span bridges. It is an economical and reasonable solution to reduce the vibration of long-span structures by using frequency-tuned mass dampers (TMDs). TMD is one of the earliest structural passive control devices, which is a vibration system composed of springs, dampers and mass blocks. When the main structure vibrates under the action of external excitation, the FM mass damper is driven to vibrate together, and the inertia force generated by it reacts on the structure, and its dampi...

Claims

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Application Information

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IPC IPC(8): E04B1/98E04H9/02G01M7/02
CPCE04H9/02E04H9/0215G01M7/00
Inventor 刘怡鹏罗永峰李益萱
Owner TONGJI UNIV
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