Vibration reduction and anti-swing method

Abstract

The invention relates to a vibration reduction and anti-swing method, which is characterized in that plate blades capable of controlling rotation are mounted on a target structure needing to be controlled, vibration is generated on the basis that the target structure is influenced by wind, the plate blades are controlled to rotate through an algorithm to be coupled with the wind to do negative work on the target structure, and the purposes of vibration reduction and anti-swing of the target structure are achieved. The vibration reduction and anti-swing method comprises the following steps: S1, collecting vibration parameters of a target structure; s2, calculating vibration energy of the target structure; s3, controlling blade rotation and wind coupling to do negative work on the target structure; s4, vibration energy of the target structure is reduced through negative work, and vibration reduction and swing prevention of the target structure are achieved; the control blades are controlled to rotate so as to be coupled with wind to do negative work on vibration of the target structure, wind is made with wind, vibration energy of the target structure is reduced, the technical effect of vibration reduction and swing prevention of the target structure is achieved, dependence on fixed parameters is avoided, a mass block is not needed, and cost is reduced. The problem that the limitation is large when a conventional damper is adopted for vibration reduction of a target structure is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction, in particular to a vibration reduction and anti-sway method. Background Art

[0002] Large structures such as high-rise buildings, long-span bridges, wind power generation facilities, and ships are often affected by fluids and vibrate. For example, wind speed in nature is unpredictable, and especially under strong winds, the safety and usability of the structure will be affected.

[0003] Conventional structures, such as engineering structures, often use passive dampers and active mass dampers for vibration reduction. Passive dampers rely on fixed parameters and are difficult to adapt to vibrations of different speeds. Active mass dampers rely on external energy sources and are complex to maintain.

[0004] Therefore, a vibration reduction and anti-sway method that can adapt to different speeds and does not rely on external energy is studied to solve the problem of large limitations in using conventional dampers to reduce vibration of the target structure. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a vibration reduction and anti-sway method to solve the problem that conventional dampers used in the prior art have large limitations in reducing vibration of a target structure.

[0006] To achieve the above objectives, the present invention provides a vibration reduction and anti-sway method, wherein a controllable rotating blade is installed on a target structure to be controlled. Based on the vibration of the target structure caused by wind, the blade rotation is controlled by an algorithm to couple with the wind to perform negative work on the target structure, thereby achieving the purpose of vibration reduction and anti-sway of the target structure. The vibration reduction and anti-sway method is characterized in that it includes the following steps:

[0007] S1. Collect vibration parameters of the target structure;

[0008] S2. Calculate the vibration energy of the target structure;

[0009] S3, controlling blade rotation and wind coupling to do negative work on the target structure;

[0010] S4. Negative work reduces the vibration energy of the target structure, achieving vibration reduction and anti-sway of the target structure.

[0011] By adopting this technical solution, controllable rotating blades are installed on the target structure. Based on the coupling effect of wind and target structure, the rotation of the blades is controlled to couple with the wind to do negative work on the vibration of the target structure, so as to achieve the effect of controlling wind with wind and reducing the vibration energy of the target structure, thereby achieving the effect of vibration reduction of the target structure and the purpose of anti-sway of the target structure, solving the problem of large limitations of using conventional dampers to reduce vibration of the target structure.

[0012] Furthermore, the blade that can be controlled to rotate includes a blade unit, a motor and a controller, wherein:

[0013] The blade unit is vertically installed on the target structure; the motor is connected to the blade unit and is used to drive the vertical blade unit to rotate; the controller is electrically connected to the motor and is used to control the motor, and the controller stores the algorithm.

[0014] Furthermore, the vibration parameters of the target structure in step S1 include the mass, structural amplitude and natural angular frequency of the target structure.

[0015] Furthermore, the vibration mode of the target structure is a sine curve, and the expression is:

[0016]

[0017] Where u is the time domain representation of the target structure performing sinusoidal vibration at the equilibrium position; A is the structural amplitude of the target structure; ω is the natural angular frequency of the target structure expressed in radians; is the phase angle;

[0018] Accordingly, step S2 includes calculating the response speed of the target structure The calculation formula is:

[0019]

[0020] And the response speed of the target structure Based on this, the initial vibration energy W1 of the target structure is calculated using the following formula:

[0021]

[0022] Where m is the mass of the target structure; A0 is the initial vibration amplitude of the target structure.

[0023] Furthermore, step S3 includes proposing a calculation formula for the negative work done by wind on the target structure:

[0024]

[0025] Where ρ is the air density; K is the drag coefficient; S is the blade unit area; v is the real-time wind speed, is the average velocity of the target structure to the ground; K and S are known parameters, and ρ and v are obtained from on-site monitoring. Calculated after field monitoring.

[0026] Furthermore, step S4 includes reducing the vibration energy of the target structure by negative work to obtain the reduced vibration energy W1 of the target structure, which is calculated as follows:

[0027]

[0028] Furthermore, step S4 also includes determining whether the reduced target structure vibration energy W1 meets the target structure vibration reduction requirement;

[0029] If the target structural vibration reduction requirements are met, no further operations are required;

[0030] If the target structure vibration reduction requirements are not met, the blade unit rotation angle is adjusted to use the reduced target structure vibration energy W1 as the initial vibration energy of the target structure, and the adjusted target structure vibration energy W2 is calculated. The calculation formula is as follows:

[0031]

[0032] The vibration reduction requirement is judged again until the adjusted target structure vibration energy meets the target structure vibration reduction requirement.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] Controllable rotating blades are installed on the target structure. Based on the coupling effect of wind and target structure, the rotation of the blades is controlled to couple with the wind to do negative work on the vibration of the target structure, so as to achieve the effect of wind controlling wind and reducing the vibration energy of the target structure, thereby achieving the effect of vibration reduction and anti-sway of the target structure. It does not rely on fixed parameters and does not require the use of mass blocks, thus solving the problem of large limitations of using conventional dampers to reduce the vibration of the target structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the flow of the vibration reduction and anti-sway method of the present invention;

[0036] Figure 2 Schematic diagram of a damping system mainly composed of blades that can control rotation. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] Please see the attached Figure 1 The present invention provides a vibration reduction and anti-sway method, in which a blade capable of controlling rotation is installed on a target structure to be controlled, comprising a blade unit, a motor, and a controller, wherein the blade unit is vertically installed on the target structure; the motor is connected to the blade unit and is used to drive the vertical blade unit to rotate; the controller is electrically connected to the motor and is used to control the motor, and the controller stores the algorithm required for calculation;

[0039] Based on the coupling effect of wind and target structure, the rotation of blades is controlled to couple with wind to do negative work on the vibration of the target structure, so as to achieve wind-controlling wind and reduce the vibration energy of the target structure, thereby achieving the effect of reducing the vibration of the target structure and simultaneously achieving the purpose of anti-sway of the target structure, solving the problem of large limitations of using conventional dampers to reduce the vibration of the target structure. The vibration reduction method includes the following steps: S1, collecting vibration parameters of the target structure; S2, calculating the vibration energy of the target structure; S3, controlling the rotation of blades and coupling with wind to do negative work on the target structure; S4, the negative work reduces the vibration energy of the target structure and achieves vibration reduction and anti-sway of the target structure.

[0040] The vibration parameters of the target structure in step S1 include the mass, structural amplitude and natural angular frequency of the target structure.

[0041] The target structure vibration mode is a sine curve, and the expression is: Where u is the time domain representation of the target structure performing sinusoidal vibration at the equilibrium position; A is the structural amplitude of the target structure; ω is the natural angular frequency of the target structure expressed in radians; is the phase angle; Accordingly, step S2 includes calculating the response speed of the target structure The calculation formula is: And the response speed of the target structure Based on this, the initial vibration energy W1 of the target structure is calculated using the following formula: Where m is the mass of the target structure; A0 is the initial vibration amplitude of the target structure.

[0042] Step S3 includes proposing a calculation formula for the negative work done by wind on the target structure: Where, ρ is the air density; K is the drag coefficient; S is the blade unit area; v is the real-time wind speed; is the average velocity of the target structure to the ground, where K and S are known parameters, and ρ and v are obtained from on-site monitoring. It is calculated after on-site monitoring. Specifically, ρ can be monitored using a density sensor, and v can be monitored using a wind speed sensor.

[0043] Furthermore, due to the difference between wind direction and blade unit setting direction, K in the calculation formula for the negative work done by the wind on the target structure can also be the lift coefficient due to the actual negative work calculation requirements.

[0044] Step S4 includes reducing the vibration energy of the target structure by negative work to obtain the reduced vibration energy W1 of the target structure, which is calculated as follows: It also includes judging whether the reduced target structure vibration energy W1 meets the target structure vibration reduction requirements; if it does, no other operations are required; if it does not, the blade unit rotation angle is adjusted, and the reduced target structure vibration energy W1 is used as the initial vibration energy of the target structure, and the adjusted target structure vibration energy W2 is calculated. The calculation formula is as follows: The vibration reduction requirement is judged again until the target structure vibration energy after adjustment meets the target structure vibration reduction requirement. The multiple judgment formulas are progressively as follows:

[0045]

[0046] …

[0047]

[0048] Furthermore, the blades that can be controlled to rotate can be used as the main body to form a damping system attached to the target structure. Figure 2 , adding a signal collector to collect data of parameters required by the algorithm to form the field end, adding a remote control center to form the monitoring end, and the two are wirelessly connected through the communication module to form a damping system;

[0049] Specifically, the signal collector collects the parameter data required by the algorithm in real time, and calculates the vibration state of the target structure through the algorithm in real time. When active vibration reduction is required, the controller controls the motor to rotate and change the angle of the blade unit so that it couples with the wind and performs negative work on the target structure, thereby achieving the purpose of active vibration reduction of the target structure; the active vibration reduction state is monitored by the remote control center, and when the data is abnormal, remote intervention and adjustment can be made on site.

[0050] Furthermore, the target structure includes but is not limited to an engineering building structure, and can also be a ship. By installing the damping system with controllable rotating blades as the main body on the ship, the same method as the above embodiment is implemented to achieve vibration reduction and anti-sway of the ship on the water surface.

[0051] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A vibration reduction and anti-sway method, wherein a controllable rotating blade is installed on a target structure to be controlled. Based on the vibration of the target structure caused by wind, the blade rotation is controlled by an algorithm and coupled with the wind to perform negative work on the target structure, thereby achieving the purpose of vibration reduction and anti-sway of the target structure. The method is characterized by: The vibration reduction and anti-sway method comprises the following steps: S1. Collect vibration parameters of the target structure; S2. Calculate the vibration energy of the target structure; S3, controlling blade rotation and wind coupling to do negative work on the target structure; S4. Negative work reduces the vibration energy of the target structure, achieving vibration reduction and anti-sway of the target structure.

2. The vibration reduction and anti-sway method according to claim 1, characterized in that: The blade that can be controlled to rotate includes a blade unit, a motor and a controller, wherein: The blade unit is vertically installed on the target structure; the motor is connected to the blade unit and is used to drive the vertical blade unit to rotate; the controller is electrically connected to the motor and is used to control the motor, and the controller stores the algorithm.

3. The vibration reduction and anti-sway method according to claim 2, characterized in that: The vibration parameters of the target structure in step S1 include the mass, structural amplitude and natural angular frequency of the target structure.

4. The vibration reduction and anti-sway method according to claim 3, characterized in that: The target structure vibration mode is a sine curve, and the expression is: Where u is the time domain representation of the target structure performing sinusoidal vibration at the equilibrium position; A is the structural amplitude of the target structure; ω is the natural angular frequency of the target structure expressed in radians; is the phase angle; Accordingly, step S2 includes calculating the response speed of the target structure The calculation formula is: And the response speed of the target structure Based on this, the initial vibration energy W1 of the target structure is calculated using the following formula: Where m is the mass of the target structure; A0 is the initial vibration amplitude of the target structure.

5. The vibration reduction and anti-sway method according to claim 4, characterized in that: Step S3 includes proposing a calculation formula for the negative work done by wind on the target structure: Where ρ is the air density; K is the drag coefficient; S is the blade unit area; v is the real-time wind speed, is the average velocity of the target structure to the ground; K and S are known parameters, and ρ and v are obtained from on-site monitoring. Calculated after field monitoring.

6. The vibration reduction and anti-sway method according to claim 5, characterized in that: Step S4 includes reducing the vibration energy of the target structure by negative work to obtain the reduced vibration energy W1 of the target structure, which is calculated as follows:

7. The vibration reduction and anti-sway method according to claim 6, characterized in that: Step S4 also includes determining whether the reduced target structure vibration energy W1 meets the target structure vibration reduction and anti-sway requirements; If the target structural vibration reduction and anti-sway requirements are met, no other operations are required; If the target structure vibration reduction and anti-sway requirements are not met, the blade unit rotation angle is adjusted, and the reduced target structure vibration energy W1 is used as the initial vibration energy of the target structure. The adjusted target structure vibration energy W2 is calculated using the following formula: The vibration reduction and anti-sway requirements are judged again until the vibration energy of the target structure after adjustment meets the vibration reduction and anti-sway requirements of the target structure.

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