A frequency-tuned mass damper capable of actively adjusting damping coefficient and vibration frequency
By introducing sensors and current controllers into the frequency modulation mass damper, the magnetic field size is adjusted in real time to adjust the damping coefficient and vibration frequency, the problem that the passive frequency modulation mass damper cannot be dynamically adjusted is solved, and an effective response to changes in building structure parameters is achieved. Improves vibration control effect.
Patent Information
- Application Number
- CN202110417380.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-04-19
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2041-04-19
AI Technical Summary
The passive frequency modulation mass damper used in existing buildings changes in structural parameters due to load changes and component aging during the life cycle of the building. It cannot dynamically adjust its mass, frequency and damping coefficients, and cannot effectively deal with changes in structural parameters, resulting in vibration control. Not effective.
A frequency modulation mass damper including the top plate, the bottom plate and the mass block is designed. The structure vibration is monitored through sensors, the current controller is used to adjust the current size, and the magnetic field size is changed, so as to adjust the damping coefficient and vibration frequency in real time, using guide rods and limit positions. The ring is combined with the adjustment mechanism composed of soft iron and wires to achieve active adjustment of the damping coefficient and vibration frequency.
Real-time performance adaptation of frequency modulation mass dampers is achieved, and the damping coefficient and vibration frequency can be dynamically adjusted according to changes in structural parameters, improving the vibration control effect of building structures under load changes and component aging conditions, ensuring that the structural vibration is within a reasonable range.
Smart Images
Figure CN113062488B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building shock absorption, in particular to a frequency-modulated mass damper capable of actively adjusting a damping coefficient and a vibration frequency. Background Art
[0002] In order to control the vertical vibration of long-span floor slabs under pedestrian excitation loads, frequency-tuned mass dampers are often used. Through the interaction between the frequency-tuned mass damper and the main structure, energy can be transferred from the main structure to the energy dissipation device in the frequency-tuned mass damper, thereby achieving the purpose of reducing the vibration of the main structure.
[0003] At present, passive frequency-tuned mass dampers are mainly used in construction projects. That is, once the frequency-tuned mass damper is installed and debugged, the mass, frequency and damping coefficient of the frequency-tuned mass damper remain fixed during the life cycle of the building. However, during the life cycle of a building, changes in loads and aging of components will cause changes in structural parameters such as stiffness. Therefore, the structure's parameter requirements for the frequency-tuned mass damper are dynamic. Based on this situation, a frequency-tuned mass damper that can actively adjust the damping coefficient and vibration frequency is invented, so that the performance of the frequency-tuned mass damper can adapt to changes in structural parameters in real time. Summary of the invention
[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a frequency-modulated mass damper capable of actively adjusting the damping coefficient and the vibration frequency.
[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a frequency-modulated mass damper that can actively adjust the damping coefficient and the vibration frequency, including a top plate, a bottom plate and a mass block that constitute the main body of the frequency-modulated mass damper, the mass block is arranged between the top plate and the bottom plate and fixed to the top plate, and the mass block is provided with an adjustment mechanism 1 that can actively monitor the vibration changes and thereby adjust the damping coefficient, an adjustment mechanism 2 that can actively monitor the vibration changes and thereby adjust the vibration frequency is provided between the top plate and the bottom plate, and a guide rod for controlling the movement direction is provided between the top plate and the bottom plate.
[0006] Preferably, a limiting ring is provided on the guide rod.
[0007] Preferably, the regulating mechanism 1 includes a conductor plate, a first soft iron, a first wire, a DC power supply, a first current controller and a sensor, the first wire is connected from the positive pole of the DC power supply and wound around the first soft iron, and then the first current controller is connected in series and finally connected to the negative pole of the DC power supply, the first current controller and the sensor are electrically connected, the first soft iron is installed on the mass block, and the conductor plates are respectively located on both sides of the first soft iron in the direction of the magnetic pole, and a gap is left.
[0008] Preferably, the second regulating mechanism includes a second soft iron, a third soft iron, a second wire, a DC power supply, a second current controller and a sensor. The second soft iron is installed on the top plate, and the third soft iron is installed on the bottom plate, both of which are located on both sides of the mass block. The second wire is connected from the positive pole of the DC power supply, and is sequentially wound around the second soft iron, the third soft iron on the left side, and the third soft iron and the second soft iron on the right side, and then the second current controller is connected in series, and finally connected to the negative pole of the DC power supply. The winding direction of the second wire on each side of the second soft iron and the third soft iron is different, and the first current controller and the sensor are electrically connected.
[0009] Preferably, the circuits of the regulating mechanism 1 and the regulating mechanism 2 are connected in parallel, and use the same DC power supply and sensor.
[0010] Preferably, the sum of the heights of the second soft iron and the third soft iron is not greater than the distance from the bottom surface of the limiting ring to the top surface of the bottom plate.
[0011] Beneficial effects of the present invention: The present invention utilizes sensors to monitor the vibration response of the structure, and then adjusts the size of the magnetic field generated by the energized coil by controlling the current in the circuit according to the real-time vibration response. At the same time, the generated magnetic field is used for the eddy current energy dissipation device, and is also used for like-sex magnetic poles to generate repulsive force as a stiffness element of the frequency-modulated mass damper, thereby controlling the damping coefficient and vibration frequency of the frequency-modulated mass damper in real time to cope with changes in structural parameters caused by factors such as load changes and component aging during the life cycle of the building structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the structure of the present invention.
[0013] Figure 2 It is the system control loop diagram of the present invention.
[0014] In the figure: 1. top plate; 2. bottom plate; 3. mass block; 4. guide rod; 5. limit ring; 6. conductor plate; 7. first soft iron; 8. second soft iron; 9. third soft iron; 10. DC power supply; 11. first wire; 12. second wire; 13. sensor; 14. first current controller; 15. second current controller. DETAILED DESCRIPTION
[0015] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.
[0016] Embodiment: A frequency-tuned mass damper capable of actively adjusting the damping coefficient and the vibration frequency, such as Figure 1-Figure 2As shown, it includes a top plate, a bottom plate and a mass block constituting the main body of the frequency-modulated mass damper, the mass block is arranged between the top plate and the bottom plate and fixed to the top plate, and the mass block is provided with an adjustment mechanism 1 that can actively monitor vibration changes and thereby adjust the damping coefficient, an adjustment mechanism 2 that can actively monitor vibration changes and thereby adjust the vibration frequency is provided between the top plate and the bottom plate, a guide rod for controlling the movement direction is provided between the top plate and the bottom plate, a limit ring is provided on the guide rod, the bottom plate is fixedly connected to the main structure, the guide rod is fixedly connected to the bottom plate, a limit ring is installed on the guide rod, a through hole is opened on the top plate to penetrate the guide rod, and when no power is initially supplied, the top plate is placed on the limit ring.
[0017] The regulating mechanism 1 includes a conductor plate, a first soft iron, a first wire, a DC power supply, a first current controller and a sensor. The first wire is connected from the positive pole of the DC power supply and wound around the first soft iron. Then the first current controller is connected in series and finally connected to the negative pole of the DC power supply. The first current controller and the sensor are electrically connected. The first soft iron is installed on the mass block. The conductor plates are respectively located on both sides of the first soft iron in the direction of the magnetic pole, and a gap is left. The vibration response of the structure is monitored by the sensor, and then the resistance value is changed by the first current controller according to the real-time vibration response to adjust the current size, thereby adjusting the size of the magnetic field generated by the energized coil, thereby adjusting the damping coefficient.
[0018] Preferably, the second regulating mechanism includes a second soft iron, a third soft iron, a second wire, a DC power supply, a second current controller and a sensor. The second soft iron is mounted on the top plate, and the third soft iron is mounted on the bottom plate, both of which are located on both sides of the mass block. The second wire is connected from the positive pole of the DC power supply, and is wound around the second soft iron, the third soft iron on the left side, and the third soft iron and the second soft iron on the right side in sequence, and then the second current controller is connected in series, and finally connected to the negative pole of the DC power supply. The second wire has different winding directions for the second soft iron and the third soft iron on each side, and the first current controller is electrically connected to the sensor. The vibration response of the structure is monitored by the sensor, and then the resistance value is changed by the second current controller according to the real-time vibration response to adjust the current size, thereby adjusting the size of the magnetic field generated by the energized coil, thereby changing the vibration frequency.
[0019] The circuits of the regulating mechanism 1 and the regulating mechanism 2 are connected in parallel, and use the same DC power supply and sensor.
[0020] The sum of the heights of the second soft iron and the third soft iron is not greater than the distance between the bottom surface of the limiting ring and the top surface of the bottom plate.
[0021] The sensor is installed at the vibration location of the structure, measures the vibration response of the structure under external excitation, and feeds back the data to the first current controller and the second current controller. The first current controller and the second current controller adjust the resistance value in the current controller in real time according to the set active control algorithm, thereby controlling the current in the circuit. The magnitude of the current in the control circuit can adjust the magnitude of the magnetic field generated by the energized coil. At the same time, the generated magnetic field is used for the eddy current energy dissipation device (i.e., the adjustment mechanism 1), and is also used for the same-sex magnetic poles to generate repulsive force and serve as the stiffness element of the frequency-modulated mass damper (i.e., the adjustment mechanism 2), thereby controlling the damping coefficient and vibration frequency of the frequency-modulated mass damper in real time to cope with the structural parameter changes caused by factors such as load changes and component aging during the life cycle of the building structure.
[0022] Working principle: When the monitored structural vibration acceleration increases, the resistance in the first current controller is lowered to increase the eddy current damping coefficient, thereby increasing the energy consumption capacity of the frequency-modulated mass damper, thereby reducing the structural vibration acceleration and controlling the peak vibration acceleration of the structure within a reasonable range; when the monitored structural fundamental frequency increases, the resistance in the second current controller is lowered to increase the vibration frequency of the frequency-modulated mass damper, otherwise the resistance is increased.
[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A frequency-modulated mass damper capable of actively adjusting the damping coefficient and the vibration frequency, characterized in that: The invention comprises a top plate, a bottom plate and a mass block constituting a main body of a frequency modulated mass damper, wherein the mass block is arranged between the top plate and the bottom plate and fixed to the top plate, and a first regulating mechanism capable of actively monitoring vibration changes and adjusting the damping coefficient thereby is arranged on the mass block, a second regulating mechanism capable of actively monitoring vibration changes and adjusting the vibration frequency thereby is arranged between the top plate and the bottom plate, and a guide rod for controlling the movement direction is arranged between the top plate and the bottom plate; The regulating mechanism 1 includes a conductor plate, a first soft iron, a first wire, a DC power supply, a first current controller and a sensor, wherein the first wire is connected from the positive pole of the DC power supply and is wound around the first soft iron, and then the first current controller is connected in series and finally connected to the negative pole of the DC power supply, the first current controller and the sensor are electrically connected, the first soft iron is mounted on the mass block, and the conductor plates are respectively located on both sides of the first soft iron in the direction of the magnetic pole, and a gap is left; The second regulating mechanism includes a second soft iron, a third soft iron, a second wire, a DC power supply, a second connection controller and a sensor. The second soft iron is installed on the top plate, and the third soft iron is installed on the bottom plate, both of which are located on both sides of the mass block. The second wire is connected starting from the positive pole of the DC power supply, and is sequentially wound around the second soft iron, the third soft iron on the left side, and the third soft iron and the second soft iron on the right side, and then the second current controller is connected in series, and finally connected to the negative pole of the DC power supply. The winding direction of the second wire on each side of the second soft iron and the third soft iron is different, and the first current controller and the sensor are electrically connected.
2. A frequency modulated mass damper capable of actively adjusting damping coefficient and vibration frequency according to claim 1, characterized in that: A limiting ring is arranged on the guide rod.
3. The frequency modulated mass damper capable of actively adjusting the damping coefficient and the vibration frequency according to claim 1, characterized in that: The circuits of the regulating mechanism 1 and the regulating mechanism 2 are connected in parallel, and use the same DC power supply and sensor.
4. The frequency modulated mass damper capable of actively adjusting the damping coefficient and the vibration frequency according to claim 1, characterized in that: The sum of the heights of the second soft iron and the third soft iron is not greater than the distance between the bottom surface of the limiting ring and the top surface of the bottom plate.