WO2023107047A2 - A mass damper system with tuned liquid column - Google Patents

A mass damper system with tuned liquid column Download PDF

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Publication number
WO2023107047A2
WO2023107047A2 PCT/TR2022/051312 TR2022051312W WO2023107047A2 WO 2023107047 A2 WO2023107047 A2 WO 2023107047A2 TR 2022051312 W TR2022051312 W TR 2022051312W WO 2023107047 A2 WO2023107047 A2 WO 2023107047A2
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
mass damper
damper system
liquid column
pistons
Prior art date
Application number
PCT/TR2022/051312
Other languages
French (fr)
Other versions
WO2023107047A3 (en
Inventor
Muaz KEMERLI
Tahsin ENGIN
Ahmet Aydin
Original Assignee
Sakarya Universitesi Rektorlugu
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from TR2021/019011 external-priority patent/TR2021019011A2/en
Application filed by Sakarya Universitesi Rektorlugu filed Critical Sakarya Universitesi Rektorlugu
Publication of WO2023107047A2 publication Critical patent/WO2023107047A2/en
Publication of WO2023107047A3 publication Critical patent/WO2023107047A3/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
    • E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems

Definitions

  • the invention relates to a mass damper system with tuned liquid column suitable for damping vibrations in structures that are subjected to continuous natural vibration such as off-shore platforms, wind turbines, skyscrapers, bridges, and/or structures under vibrations affecting for a certain period of time, such as seismic vibrations.
  • the said vibration damping systems are divided according to the structure in which they will be used as tuned mass damper systems and cable damper systems.
  • the said tuned mass damper systems are generally placed on the top floor of the structure to reduce the dynamic loads acting on the structure.
  • a mass damper system with tuned liquid column damper (TLCD) which is usually a type of tuned mass damper system that damps the vibrations in the structures by the oscillatory movement of the liquid, is used.
  • TLCD tuned liquid column damper
  • the vibration is damped by the movement of the liquid in a U-tube reservoir.
  • these damping systems with tuned liquid columns are passive dampers, so the damping frequencies cannot be adjusted during the operation. This situation limits the efficiency of the mass damper system with tuned liquid column.
  • the mass damper system with tuned liquid column is converted to a semi-actively controlled system by using a magnetorheological (MR) liquid.
  • MR magnetorheological
  • the internal volume of the said mass damper systems with tuned liquid column is usually filled with completely magnetorheological fluid instead of water. This increases the cost of the system and makes it less feasible.
  • the mass damper systems with the tuned liquid column used in an 8-floor building with an average weight of 3000 tons must be filled with an average of 5000 L of magnetorheological fluid.
  • the system can be produced at very high costs.
  • sedimentation and agglomeration may also occur in the magnetorheological fluid over time in the mass damper systems with tuned liquid column entirely filled with magnetorheological fluid. Each of these effects reduces the damping efficiency of the mass damper system with tuned liquid column.
  • the present invention relates to a mass damper system with tuned liquid column to eliminate the above-mentioned shortcomings and to bring a novel solution to the related technical field.
  • the object of the present invention is to develop a mass damper system with tuned liquid column that enables the damping of vibrations in structures subjected to vibrations for a certain period of time, such as continuous natural vibration and/or seismic vibrations.
  • the object of the present invention is to develop a mass damper system with tuned liquid column that provides the damping of vibrations in structures using a very small amount of magnetorheological fluid.
  • Another object of the present invention is to develop a mass damper system with tuned liquid column with low cost and high damping efficiency.
  • the present invention is a mass damper system with tuned liquid column for damping the vibrations in structures that are constantly subjected to natural vibration and/or seismic vibrations for a certain period of time, which is suitable for being placed on the top of a structure, and comprising at least one chamber, which is filled with at least one first liquid and is in any form in which the pipe or sphere or water can oscillate horizontally.
  • the novelty of the invention is that it comprises at least one piston which is positioned at the ends of the said chamber, to which the first liquid contacts, to contact with the walls of the chamber, and which moves with the movement of the first liquid in the chamber; at least two second liquid which is located in the parts of the said piston(s) that contact the wall of the chamber and is magnetorheological fluid; and at least one coil in the said pistons to create a magnetic field by feeding direct current to the said pistons for controlling the damping intensity.
  • the mass damper system with a tuned liquid column developed by the present invention provides effective damping of the vibration to which the structure is subjected.
  • a possible embodiment of the invention is characterized in that the viscosity of the second liquid is changed by the magnetic field formed by the said coil. In this way, the frictional force between the pistons and the chamber wall can preferably be adjusted for a first time of 5-6 ms.
  • a possible embodiment of the invention is characterized in that the said chamber is in linear form and performs damping in the linear direction. In this way, a modular placement of the mass damper system with a tuned liquid column developed by the present invention is possible.
  • Another possible embodiment of the invention is characterized in that it comprises at least one seal for sealing between the walls of the said chamber and the pistons.
  • the said sealing element is made of felt or any other sealing material.
  • Figure 1 shows a representative application of the mass damper system with tuned liquid column of the invention on a structure.
  • Figure 2 shows a cross-sectional view of the piston of the mass damper system with tuned liquid column of the invention.
  • the invention relates to a mass damper system with a tuned liquid column for damping the vibrations in structures exposed to continuous natural vibration and/or seismic vibrations affecting for a certain period of time.
  • the mass damper system with the tuned liquid column of the invention is suitable for placing at the top of a structure (Y). It comprises at least one first liquid (preferably water) filled into the structure (Y) and at least one chamber (1) in the form of a pipe.
  • the said mass damper system with tuned liquid column also comprises at least one piston (2) which is positioned at the ends of the said chamber (1), to which the first liquid contacts, to contact with the walls of the chamber (1), and which move with the movement of the first liquid in the chamber (1). It comprises at least two second liquids (3), which are magnetorheological (MR) fluid, in the parts of the piston(s) (2) that come into contact with the wall of the chamber (1). In addition, it comprises at least one coil (4) located in the said pistons (2), which generates a magnetic field by feeding direct current to the said pistons (2) to control the damping intensity.
  • MR magnetorheological
  • the magnetic field formed by the coil (4) changes the viscosity of the second liquid (3).
  • the frictional force between the pistons (2) and the wall of the chamber (1) is preferably adjustable for a first time (i.e., instantly) of 5-6 ms. This quick response ensures effective damping of the vibration to which the structure is subjected (Y) in which the mass damper systems with a tuned liquid column developed by the present invention is placed.
  • the said chamber (1 ) is in the form of a “U”.
  • the said chamber (1 ) is preferably in a linear form. Owing to the fact that chamber (1) is a linear pipe, the mass damper system with a tuned liquid column developed by the present invention can be placed modularly on a structure (Y).
  • the said mass damper system with tuned liquid column comprises at least one sealing element (5), preferably made of felt material, for sealing between the walls of the said chamber (1 ) and the pistons (2).
  • the said sealing element (5) comprises at least one first sealing element positioned in the respective part between the walls of the said chamber (1) and the pistons (2) to seal the second liquid (3).
  • the said sealing element (5) comprises at least one second seal positioned in the respective portion between the walls of the said chamber (1) and the pistons (2) to seal the first liquid.
  • At least one of the said mass damper systems with tuned liquid column is placed at the top of the said structure (Y).
  • the first liquid in the said chamber (1 ) starts oscillating, and the pistons (2) move with the movement of the said first liquid.
  • the said coil (4) feed direct current to the pistons (2) and a magnetic field is applied to the second liquid (3), which is the magnetorheological fluid.
  • the viscosity of the second liquid (3) changes, and the friction force between the pistons (2) and the wall of the chamber (1) can be adjusted for a first period of time.
  • the vibration frequency to which the structure (Y) is exposed can be effectively controlled or damped regardless of the size.

Abstract

The invention relates to a mass damper system with a tuned liquid column for damping the vibrations in structures that are constantly subjected to natural vibration and/or seismic vibrations affecting for a certain period of time, suitable for being placed on the top of the structure (Y), and comprising at least one chamber (1), which is filled with at least one first liquid and in the form of a pipe. The novelty of the invention is characterized in that it comprises at least two pistons (2), which are positioned at the ends of the said chamber (1), to which the first liquid contacts, to contact with the walls of the chamber (1 ), and which move with the movement of the first liquid in the chamber (1); at least two second liquids (3) which are located in the parts of the said pistons (2) that contact the wall of the chamber (1) and is magnetorheological fluid; and at least two coils (4) located inside the said pistons (2) to generate a magnetic field by feeding direct current to the said pistons (2) for controlling the damping intensity.

Description

A MASS DAMPER SYSTEM WITH TUNED LIQUID COLUMN
TECHNICAL FIELD
The invention relates to a mass damper system with tuned liquid column suitable for damping vibrations in structures that are subjected to continuous natural vibration such as off-shore platforms, wind turbines, skyscrapers, bridges, and/or structures under vibrations affecting for a certain period of time, such as seismic vibrations.
BACKGROUND
Since the natural damping rates of structures such as off-shore platforms, wind turbines, skyscrapers, buildings, and bridges are low, they are more likely to be affected by the vibrations caused by wind, waves, traffic load, pedestrians, and earthquakes. These effects may limit the use of structures or end up with the collapse of the structure. For example, bending and twisting oscillations and constant vibrations in bridges lead to large amplitudes and therefore dangerous resonance vibrations can destroy the deck structure. Therefore, it is very important to dampen the vibrations in these structures.
There are various vibration damping systems developed for the mitigation of vibrations in structures in the state of the art. The said vibration damping systems are divided according to the structure in which they will be used as tuned mass damper systems and cable damper systems. The said tuned mass damper systems are generally placed on the top floor of the structure to reduce the dynamic loads acting on the structure. In recent decades, a mass damper system with tuned liquid column damper (TLCD), which is usually a type of tuned mass damper system that damps the vibrations in the structures by the oscillatory movement of the liquid, is used. In the said mass damper systems with a tuned liquid column damper (TLCD), the vibration is damped by the movement of the liquid in a U-tube reservoir. However, these damping systems with tuned liquid columns are passive dampers, so the damping frequencies cannot be adjusted during the operation. This situation limits the efficiency of the mass damper system with tuned liquid column.
In order to solve the above-mentioned problem, the mass damper system with tuned liquid column is converted to a semi-actively controlled system by using a magnetorheological (MR) liquid. However, the internal volume of the said mass damper systems with tuned liquid column is usually filled with completely magnetorheological fluid instead of water. This increases the cost of the system and makes it less feasible. As an example; the mass damper systems with the tuned liquid column used in an 8-floor building with an average weight of 3000 tons must be filled with an average of 5000 L of magnetorheological fluid. Considering the market value of the MR fluid, the system can be produced at very high costs.
In the state of the art, sedimentation and agglomeration may also occur in the magnetorheological fluid over time in the mass damper systems with tuned liquid column entirely filled with magnetorheological fluid. Each of these effects reduces the damping efficiency of the mass damper system with tuned liquid column.
All these problems mentioned above have made it necessary to make an innovation in the relevant technical field as a result.
BRIEF DESCRIPTION OF THE INVENTION
The present invention relates to a mass damper system with tuned liquid column to eliminate the above-mentioned shortcomings and to bring a novel solution to the related technical field.
The object of the present invention is to develop a mass damper system with tuned liquid column that enables the damping of vibrations in structures subjected to vibrations for a certain period of time, such as continuous natural vibration and/or seismic vibrations.
The object of the present invention is to develop a mass damper system with tuned liquid column that provides the damping of vibrations in structures using a very small amount of magnetorheological fluid.
Another object of the present invention is to develop a mass damper system with tuned liquid column with low cost and high damping efficiency.
In order to achieve all these objects from the above-mentioned and the following detailed description, the present invention is a mass damper system with tuned liquid column for damping the vibrations in structures that are constantly subjected to natural vibration and/or seismic vibrations for a certain period of time, which is suitable for being placed on the top of a structure, and comprising at least one chamber, which is filled with at least one first liquid and is in any form in which the pipe or sphere or water can oscillate horizontally. The novelty of the invention is that it comprises at least one piston which is positioned at the ends of the said chamber, to which the first liquid contacts, to contact with the walls of the chamber, and which moves with the movement of the first liquid in the chamber; at least two second liquid which is located in the parts of the said piston(s) that contact the wall of the chamber and is magnetorheological fluid; and at least one coil in the said pistons to create a magnetic field by feeding direct current to the said pistons for controlling the damping intensity. The mass damper system with a tuned liquid column developed by the present invention provides effective damping of the vibration to which the structure is subjected.
A possible embodiment of the invention is characterized in that the viscosity of the second liquid is changed by the magnetic field formed by the said coil. In this way, the frictional force between the pistons and the chamber wall can preferably be adjusted for a first time of 5-6 ms.
A possible embodiment of the invention is characterized in that the said chamber is in linear form and performs damping in the linear direction. In this way, a modular placement of the mass damper system with a tuned liquid column developed by the present invention is possible.
Another possible embodiment of the invention is characterized in that it comprises at least one seal for sealing between the walls of the said chamber and the pistons. The said sealing element is made of felt or any other sealing material.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a representative application of the mass damper system with tuned liquid column of the invention on a structure.
Figure 2 shows a cross-sectional view of the piston of the mass damper system with tuned liquid column of the invention.
DETAILED DESCRIPTION OF THE INVENTION
In this detailed description, the subject of the invention is explained to better understand the subject with examples that do not have any limiting effect. The invention relates to a mass damper system with a tuned liquid column for damping the vibrations in structures exposed to continuous natural vibration and/or seismic vibrations affecting for a certain period of time. The mass damper system with the tuned liquid column of the invention is suitable for placing at the top of a structure (Y). It comprises at least one first liquid (preferably water) filled into the structure (Y) and at least one chamber (1) in the form of a pipe. The said mass damper system with tuned liquid column also comprises at least one piston (2) which is positioned at the ends of the said chamber (1), to which the first liquid contacts, to contact with the walls of the chamber (1), and which move with the movement of the first liquid in the chamber (1). It comprises at least two second liquids (3), which are magnetorheological (MR) fluid, in the parts of the piston(s) (2) that come into contact with the wall of the chamber (1). In addition, it comprises at least one coil (4) located in the said pistons (2), which generates a magnetic field by feeding direct current to the said pistons (2) to control the damping intensity.
The magnetic field formed by the coil (4) changes the viscosity of the second liquid (3). Thus, the frictional force between the pistons (2) and the wall of the chamber (1) is preferably adjustable for a first time (i.e., instantly) of 5-6 ms. This quick response ensures effective damping of the vibration to which the structure is subjected (Y) in which the mass damper systems with a tuned liquid column developed by the present invention is placed.
In a preferred embodiment of the invention, the said chamber (1 ) is in the form of a “U”. The said chamber (1 ) is preferably in a linear form. Owing to the fact that chamber (1) is a linear pipe, the mass damper system with a tuned liquid column developed by the present invention can be placed modularly on a structure (Y).
In a preferred embodiment of the invention, the said mass damper system with tuned liquid column comprises at least one sealing element (5), preferably made of felt material, for sealing between the walls of the said chamber (1 ) and the pistons (2).
In a preferred embodiment of the invention, the said sealing element (5) comprises at least one first sealing element positioned in the respective part between the walls of the said chamber (1) and the pistons (2) to seal the second liquid (3). In a preferred embodiment of the invention, the said sealing element (5) comprises at least one second seal positioned in the respective portion between the walls of the said chamber (1) and the pistons (2) to seal the first liquid.
In an exemplary embodiment of the invention, in order to protect a structure (Y) from the vibrations caused by wind, wave, traffic load, pedestrians, and earthquakes, at least one of the said mass damper systems with tuned liquid column is placed at the top of the said structure (Y). When the said structure (Y) is exposed to vibration, the first liquid in the said chamber (1 ) starts oscillating, and the pistons (2) move with the movement of the said first liquid. In the meantime, the said coil (4) feed direct current to the pistons (2) and a magnetic field is applied to the second liquid (3), which is the magnetorheological fluid. In this way, the viscosity of the second liquid (3) changes, and the friction force between the pistons (2) and the wall of the chamber (1) can be adjusted for a first period of time. In this way, the vibration frequency to which the structure (Y) is exposed can be effectively controlled or damped regardless of the size.
The scope of protection of the invention is specified in the attached claims and cannot be limited to those explained for sampling purposes in this detailed description. It is evident that a person skilled in the art may exhibit similar embodiments in light of the above-mentioned facts without drifting apart from the main theme of the invention.
REFERENCE NUMBERS GIVEN IN THE FIGURE
Y Structure
1 Chamber 2 Pistons
3 Second liquid
4 Coil
5 Sealing element

Claims

1. A mass damper system with a tuned liquid column for damping the vibrations in structures (Y) that are constantly subjected to natural vibration and/or seismic vibrations in a certain period of time, suitable for being placed on the top of the structure (Y), and comprising at least one chamber (1), which is filled with at least one first liquid and in the form of a pipe, characterized in that it comprises at least two pistons (2), which are positioned into the ends of the said chamber (1 ), to which the first liquid contacts, to contact with the walls of the chamber (1), and which move with the movement of the first liquid in the chamber (1); at least two second liquids (3) which are located in the parts of the said pistons (2) that contact the wall of the chamber (1) and is magnetorheological fluid; and at least two coils (4) in the said pistons (2) to generate a magnetic field by feeding direct current to the said pistons (2) for controlling the damping intensity.
2. A mass damper system with tuned liquid column according to claim 1 , characterized in that the said first liquid is water.
3. A mass damper system with tuned liquid column according to claim 1 , characterized in that the said chamber (1 ) is in the form of a "U".
4. A mass damper system with tuned liquid column according to claim 1 , characterized in that the said chamber (1 ) is in a linear form.
5. A mass damper system with tuned liquid column according to claim 1 , characterized in that it comprises at least two coils (4) that generate a magnetic field to change the viscosity of the second liquid (3).
6. A mass damper system with tuned liquid column according to claim 1 , characterized in that it comprises at least one sealing element (5) to ensure the sealing between the walls of the said chamber (1) and the pistons (2).
7. A mass damper system with tuned liquid column according to claim 6, characterized in that the said sealing element (5) comprises at least one first sealing element positioned in the respective portion between the walls of the said chamber (1) and the pistons (2) to seal the second liquid (3).
7 A mass damper system with tuned liquid column according to claim 6, characterized in that the said sealing element (5) comprises at least one second sealing element positioned in the respective portion between the walls of the said chamber (1) and the pistons (2) to seal the first liquid. A mass damper system with tuned liquid column according to claim 6, characterized in that the said sealing element (5) is made of felt material. A mass damper system with tuned liquid column according to claim 7, characterized in that the said first sealing element is made of felt material. A mass damper system with tuned liquid column according to claim 8, characterized in that the said second sealing element is made of felt material.
8
PCT/TR2022/051312 2021-12-02 2022-11-18 A mass damper system with tuned liquid column WO2023107047A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2021019011 2021-12-02
TR2021/019011 TR2021019011A2 (en) 2021-12-02 MASS DAMPING SYSTEM WITH ONE ADJUSTABLE FLUID COLUMN

Publications (2)

Publication Number Publication Date
WO2023107047A2 true WO2023107047A2 (en) 2023-06-15
WO2023107047A3 WO2023107047A3 (en) 2023-08-17

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6296088B1 (en) * 1997-02-24 2001-10-02 Lord Corporation Magnetorheological fluid seismic damper
CN208718472U (en) * 2018-06-26 2019-04-09 河海大学 Damp the multiple tuning column damper adjusted in real time
CN108730410B (en) * 2018-07-02 2024-01-26 浙江大学 Adjustable inertial mass damper

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