A kind of auxiliary cylindrical device for active suction and blowing and control method thereof

Abstract

The present application discloses an auxiliary cylindrical device for active suction and blowing and a control method thereof, wherein the auxiliary cylindrical device is used to be installed on the main cylindrical structure to suppress the flow-induced vibration of the main cylindrical structure, and comprises a rotating assembly, an auxiliary round rod, and a fixing mechanism; the rotating assembly is used to be installed on the main cylindrical structure, and can rotate along the circumference of the main cylindrical structure; the auxiliary round rod is fixed to the rotating assembly by a fixing mechanism, and can rotate along the circumference of the main cylindrical structure with the rotating assembly; the auxiliary round rod is a hollow rod, and a plurality of small holes are provided along the longitudinal direction, which are used to suction and blow air through the small holes to achieve disturbance or even destruction of the tail vortex of the main cylindrical structure. The auxiliary cylindrical device for active suction and blowing provided in the present application and a control method thereof can effectively suppress the flow-induced vibration of the main cylindrical structure, avoid fatigue damage caused by vibration, and effectively improve its service life by setting a rotating assembly, an auxiliary round rod, and a fixing mechanism.

Description

Technical Field

[0001] The present application relates to the field of engineering technology, and in particular to an auxiliary cylindrical device for active suction and blowing and a control method thereof. Background Art

[0002] The phenomenon of flow around a cylinder is common in various engineering fields, and the regular vortex shedding easily leads to flow-induced vibration of the structure, such as wind-induced vibration of cables and slings, vortex vibration of chimneys and wind turbine towers, breeze dancing of transmission lines, vortex-induced vibration of marine risers and offshore floating wind turbine mooring cables, etc. In actual engineering, the flow-induced stability problem of cylindrical structures or components is very prominent, and there are countless cases of structural instability or even destruction caused by flow-induced vibration. Therefore, how to improve the stability of cylindrical structures or components is of great engineering significance.

[0003] At present, the vortex-induced vibration of cylindrical structures such as cables and slings in actual engineering is mainly controlled by installing dampers, but the actual control effect is not ideal, especially for flexible cable structures with large slenderness ratios. The control effect of dampers is even more unsatisfactory due to factors such as the installation position. In recent years, many scholars at home and abroad have proposed various targeted flow control methods for cylindrical structures. The main methods for suppressing flow-induced vibration are divided into passive flow control and active flow control. Common passive flow control measures include helical lines, longitudinal ribs, wake dividers, attached round rods, passive blowing collars, etc., but these measures usually require a large number of wind tunnel tests and numerical simulations to obtain the optimal parameters, and it is difficult to cope with problems such as changes in the wind direction of actual engineering structures. Active flow control achieves the purpose of control by applying disturbances to the flow field, including suction and blowing, synthetic jets, plasma control, etc. Its advantage is that it has good adaptive ability and can change its own structure or flow parameters according to changes in working conditions to achieve the optimal control effect. It usually also requires real-time monitoring and control systems. With economic development, the world is entering a new era of digitalization and intelligence. Active flow control has also become an important idea for structural vibration control, especially in the face of special environments and different types of structural vibrations.

[0004] At present, active flow control research such as suction and blowing (inhalation and blowing) usually chooses to open holes on the surface of the actual structure and arrange suction and blowing devices from the inside to control the vibration of the structure. However, in actual engineering, it is usually not suitable to open holes or it is not convenient to arrange suction and blowing devices inside, especially for existing cylindrical structures, which may face many risks if the original structure is destroyed. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide an auxiliary cylindrical device for active suction and blowing and a control method thereof, which can effectively suppress the flow-induced vibration of the main cylindrical structure and has a wide range of applications.

[0006] The technical solution provided by the present invention is as follows:

[0007] An auxiliary cylindrical device for active suction and blowing is used to be installed on a main cylindrical structure to suppress flow-induced vibration of the main cylindrical structure, comprising a rotating assembly, an auxiliary round rod, and a fixing mechanism; the rotating assembly is used to be installed on the main cylindrical structure and can rotate along the circumference of the main cylindrical structure; the auxiliary round rod is fixed to the rotating assembly by the fixing mechanism, and can rotate along the circumference of the main cylindrical structure with the rotating assembly; the auxiliary round rod is a hollow rod, and a plurality of small holes are provided in the longitudinal direction, and is used to suction and blow air through the small holes to achieve disturbance or even destruction of the tail vortex of the main cylindrical structure.

[0008] Preferably, the rotating assembly includes an inner ring, an outer ring, and a rotating mechanism. The inner ring is detachably mounted on the main cylindrical structure, the outer ring is mounted on the inner ring, the fixing mechanism is fixed on the outer ring, and the rotating mechanism is connected to the outer ring to drive the outer ring to rotate relative to the inner ring.

[0009] Preferably, the rotating mechanism comprises a motor and a transmission mechanism, the motor is connected to the transmission mechanism, and the transmission mechanism is connected to the outer ring, so that the motor drives the outer ring to rotate through the transmission mechanism.

[0010] Preferably, the inner ring and the outer ring are both half-spliced ​​structures, and the inner ring and the outer ring are correspondingly provided with a slide rail and slide groove structure.

[0011] Preferably, a suction and blowing mechanism is connected to the end of the auxiliary round rod, and the suction and blowing mechanism is connected to the small hole through the inner cavity of the auxiliary round rod to realize suction and blowing of the small hole.

[0012] Preferably, the fixing mechanism comprises a cylindrical fixing portion, which is sleeved on the attached round rod so that the attached round rod can rotate by itself; the end of the attached round rod is connected to a rotating mechanism, which is used to drive the attached round rod to rotate by itself.

[0013] Preferably, it also includes a control system, which includes a monitoring module, a processing module, and a control module; the monitoring module is used to obtain the vibration displacement, wind speed and wind direction angle at different positions of the main cylindrical structure, and send the monitoring results to the processing module; the processing module is used to determine whether the vibration displacement response exceeds the limit value based on the vibration displacement, wind speed and wind direction angle, and if so, obtain the vibration response frequency characteristic parameters, obtain the target position of the auxiliary round rod and the target suction and blowing rate based on the vibration response frequency characteristic parameters, and send the instructions to the control module; the control module is used to control the rotating component to rotate the auxiliary round rod to the target position, and control the suction and blowing mechanism to perform suction and blowing through the small hole at the target suction and blowing rate.

[0014] Preferably, the fixing mechanism includes a cylindrical fixing portion, which is sleeved on the auxiliary round rod so that the auxiliary round rod itself can rotate; the end of the auxiliary round rod is connected to a rotating mechanism, which is used to drive the auxiliary round rod itself to rotate; the processing module is also used to obtain the target angle of the auxiliary round rod; the control module is also used to control the rotating mechanism to rotate the auxiliary round rod to the target angle.

[0015] A control method for an auxiliary cylindrical device for active suction and blowing as described above, comprising: the monitoring module obtains the vibration displacement, wind speed and wind direction angle of different positions of the main cylindrical structure, and sends the monitoring results to the processing module; the processing module determines whether the vibration displacement response exceeds the limit value according to the vibration displacement, wind speed and wind direction angle, and if so, obtains the vibration response frequency characteristic parameters, obtains the target position of the auxiliary round rod and the target suction and blowing rate according to the vibration response frequency characteristic parameters, and sends the instruction to the control module; the control module controls the rotating component to rotate the auxiliary round rod to the target position, and controls the suction and blowing mechanism to perform suction and blowing through the small hole at the target suction and blowing rate.

[0016] Preferably, the method of obtaining the target position of the subsidiary round rod and the target suction and blowing rate according to the vibration response frequency characteristic parameters includes: the processing module stores a database composed of existing test results and CFD numerical simulation results, the database contains the relationship between the vibration response frequency characteristic parameters and the target position of the subsidiary round rod and the target suction and blowing rate, and the processing module selects the target position of the subsidiary round rod and the target suction and blowing rate corresponding to the vibration response frequency characteristic parameters through the database.

[0017] Compared with the prior art, the auxiliary cylindrical device for active suction and blowing of the present invention and its control method can effectively suppress the flow-induced vibration of the main cylindrical structure by setting a rotating assembly, an auxiliary round rod, and a fixing mechanism, avoid fatigue damage caused by vibration, and effectively improve its service life, without changing the original main cylindrical structure appearance and state, and can better promote the application of active suction and blowing flow control in engineering practice, with a wider range of applications. A control system is also provided, which can continuously adjust the wind direction position of the cylinder, suction and blowing rate and other parameters, and can provide real-time feedback on the structural vibration state, forming a closed-loop active control system, and more effectively improving the flow-induced vibration suppression effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic structural diagram of an auxiliary cylindrical device for active suction and blowing according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A partial enlarged schematic diagram of the auxiliary cylindrical device shown;

[0021] Figure 3 for Figure 1 A schematic diagram of a control method for the auxiliary cylindrical device shown;

[0022] Figure 4 for Figure 1 Schematic diagram of flow-induced vibration of the auxiliary cylindrical device before application;

[0023] Figure 5 for Figure 1 Schematic diagram of flow-induced vibration after application of the auxiliary cylindrical device shown. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0028] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0029] like Figures 1 to 3 As shown, an embodiment of the present invention provides an auxiliary cylindrical device for active suction and blowing, which is used to be installed on a main cylindrical structure 1 (including a cylindrical member) to suppress the flow-induced vibration of the main cylindrical structure 1 ( Figure 1 Only a partial structure of a certain length is shown). The auxiliary cylindrical device comprises a rotating component 2, an auxiliary round rod 3, and a fixing mechanism 4.

[0030] The rotating assembly 2 is used to be installed on the main cylindrical structure 1, and can rotate along the circumference of the main cylindrical structure 1. In this embodiment, the rotating assembly 2 includes an inner ring 21, an outer ring 22, and a rotating mechanism (not shown). The inner ring 21 is detachably mounted on the main cylindrical structure 1, the outer ring 22 is mounted on the inner ring 21, the fixing mechanism 4 is fixed on the outer ring 22, and the rotating mechanism is connected to the outer ring 22 to drive the outer ring 22 to rotate relative to the inner ring 21. The rotating mechanism may include a motor and a transmission mechanism (such as internal and external gears), the motor is connected to the transmission mechanism, and the transmission mechanism is connected to the outer ring 22, so that the motor drives the outer ring 22 to rotate through the transmission mechanism (the rotating mechanism may also adopt other structures). The inner ring 21 and the outer ring 22 can both be half-spliced ​​structures, which are assembled into a whole by bolts and other structures. The half-spliced ​​structure can be conveniently mounted with the main cylindrical structure 1. The inner ring 21 and the outer ring 22 are provided with a slide rail and a slide groove structure (not shown) so that the outer ring 22 can only rotate but not move up and down, and guide the inner ring 21 and the outer ring 22 to rotate relative to each other. Two mutually parallel fixing plates 23 are radially extended from the outer edge of the outer ring 22, and a groove is formed between the two fixing plates 23 along the axial direction. Of course, in other embodiments, the rotating assembly 2 can adopt other different structures.

[0031] The fixing mechanism 4 is used to fix the subsidiary round rod 3 on the rotating assembly 2, so that the subsidiary round rod 3 can rotate along the circumference of the main cylindrical structure 1 with the rotating assembly 2. In this embodiment, the fixing mechanism 4 includes a cylindrical fixing portion 41, which is sleeved on the subsidiary round rod 3 so that the subsidiary round rod 3 can rotate itself. The outer edge of the fixing portion 41 is provided with a protrusion 42 corresponding to the radial extension of the groove of the outer ring 22, and the protrusion 42 and the fixing plate 23 are provided with through holes for bolts to be inserted and connected. Of course, in other embodiments, the fixing mechanism 4 can adopt other different structures.

[0032] The auxiliary round rod 3 is a hollow rod, the length of which is equal to that of the main cylindrical structure 1, the ratio of its outer diameter to the diameter of the main cylindrical structure 1 can be in the range of 0.1-0.5, and the distance between it and the main cylindrical structure 1 can be adjusted.

[0033] The subsidiary round rod 3 is provided with a plurality of small holes 31 along the longitudinal direction, and the end is connected to a suction and blowing mechanism. The suction and blowing mechanism is connected to the small holes 31 through the inner cavity of the subsidiary round rod 3, and suction and blowing are performed through the small holes 31 to achieve disturbance or even destruction of the tail vortex of the main cylindrical structure 1. In this embodiment, the subsidiary round rod 3 is fixed to the rotating component 2 by a fixing mechanism 4, and can rotate along the circumferential direction of the main cylindrical structure 1 with the rotating component 2. A rotating mechanism is connected to the end of the subsidiary round rod 3, and the rotating mechanism is used to drive the subsidiary round rod 3 to rotate (rotate). Of course, in other embodiments, as needed, the rotating mechanism may not be provided, and the subsidiary round rod 3 may not rotate.

[0034] In this embodiment, the auxiliary cylindrical device also includes a control system, which includes a monitoring module, a processing module, and a control module; the monitoring module is used to obtain the vibration displacement, wind speed and wind direction angle at different positions of the main cylindrical structure 1, and send the monitoring results to the processing module; the processing module is used to determine whether the vibration displacement response exceeds the limit value based on the vibration displacement, wind speed and wind direction angle, and if so, obtain the vibration response frequency characteristic parameters, obtain the target position, target angle and target suction and blowing rate of the auxiliary round rod 3 according to the vibration response frequency characteristic parameters, and send the instructions to the control module; the control module is used to control the rotating component 2 to rotate the auxiliary round rod 3 to the target position, control the rotating mechanism to rotate the auxiliary round rod 3 to the target angle, and control the suction and blowing mechanism to perform suction and blowing through the small hole 31 at the target suction and blowing rate.

[0035] Of course, in other embodiments, if the rotation mechanism is not provided to allow the subsidiary round rod 3 to rotate, the processing module does not need to obtain the target angle of the subsidiary round rod 3, and the control module will not control the rotation mechanism to rotate the subsidiary round rod 3 to the target angle.

[0036] The control method of the above-mentioned auxiliary cylindrical device includes: a monitoring module obtains the vibration displacement, wind speed and wind direction angle at different positions of the main cylindrical structure 1, and sends the monitoring results to the processing module; the processing module determines whether the vibration displacement response exceeds the limit value according to the vibration displacement, wind speed and wind direction angle, and if so, obtains the vibration response frequency characteristic parameters, obtains the target position, target angle and target suction and blowing rate of the auxiliary round rod 3 according to the vibration response frequency characteristic parameters, and sends the instruction to the control module; the control module controls the rotating component 2 to rotate the auxiliary round rod 3 to the target position, controls the rotating mechanism to rotate the auxiliary round rod 3 to the target angle, and controls the suction and blowing mechanism to perform suction and blowing through the small hole 31 at the target suction and blowing rate.

[0037] Among them, in this embodiment, the target position of the auxiliary round rod 3 and the target suction and blowing rate are obtained according to the vibration response frequency characteristic parameters, including: the processing module stores a database composed of existing test results and CFD numerical simulation results, the database contains the relationship between the vibration response frequency characteristic parameters and the target position of the auxiliary round rod 3 and the target suction and blowing rate, and the processing module selects the target position of the auxiliary round rod 3 and the target suction and blowing rate corresponding to the vibration response frequency characteristic parameters through the database.

[0038] This control method can perform real-time and continuous control on the attached cylindrical device, such as Figure 3 As shown, the actual control method may include the following steps:

[0039] 1. The monitoring module obtains the vibration displacement, wind speed and wind direction angle at different positions of the cylindrical structure in real time;

[0040] 2. The processing module determines whether flow-induced vibration occurs in the structure (flow-induced vibration is Figure 4 As shown), at the same time, it is determined whether the vibration displacement response exceeds the specification limit or the manually set limit; if no vibration occurs or the response is small, the rotating component 2 and the suction and blowing mechanism do not work; if a large vibration occurs, the vibration response frequency characteristics are obtained and the next step is entered;

[0041] 3. Import the vibration characteristics and other parameters of the main cylindrical structure 1 into the intelligent decision-making system. The system selects the target position and suction and blowing rate of the auxiliary round rod 3 that matches it according to the database composed of the existing test results and CFD numerical simulation results (if the auxiliary round rod 3 can rotate, the target angle of the auxiliary round rod 3 can also be selected);

[0042] 4. The control module issues instructions to the rotating component 2 to rotate the attached round rod 3 to the specified position (if the attached round rod 3 can and needs to rotate, the rotating mechanism is also controlled to rotate the attached round rod 3 to the target angle);

[0043] 5. Control the suction and blowing mechanism to start working, thereby disrupting the alternating shedding of the tail vortex of the main cylindrical structure 1 (such as Figure 5 );

[0044] 6. Monitor the vibration response of the main cylindrical structure 1 under the control state to determine whether the vibration response is less than the limit value; if not, return to step 4, readjust the parameters, and loop until suitable control parameters are found; if yes, return to step 1.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An auxiliary cylindrical device for active suction and blowing, used to be installed on a main cylindrical structure to suppress the flow-induced vibration of the main cylindrical structure, characterized in that: It includes a rotating component, an auxiliary round rod, a fixing mechanism, and a control system; the rotating component is used to be installed on the main cylindrical structure, and can rotate along the circumference of the main cylindrical structure; the auxiliary round rod is fixed to the rotating component by a fixing mechanism, and can rotate along the circumference of the main cylindrical structure with the rotating component; the auxiliary round rod is a hollow rod, and a plurality of small holes are provided along the longitudinal direction, which are used to realize the disturbance of the tail vortex of the main cylindrical structure through suction and blowing of the small holes; the end of the auxiliary round rod is connected to the suction and blowing mechanism, and the suction and blowing mechanism is connected to the small holes through the inner cavity of the auxiliary round rod to realize suction and blowing of the small holes; the fixing mechanism includes a cylindrical fixing part, and the fixing part is sleeved on the auxiliary round rod so that the auxiliary round rod itself can rotate; the end of the auxiliary round rod is connected to the rotating mechanism , the rotating mechanism is used to drive the auxiliary round rod to rotate itself; the control system includes a monitoring module, a processing module, and a control module; the monitoring module is used to obtain the vibration displacement, wind speed and wind direction angle at different positions of the main cylindrical structure, and send the monitoring results to the processing module; the processing module is used to determine whether the vibration displacement response exceeds the limit value according to the vibration displacement, wind speed and wind direction angle, and if so, obtain the vibration response frequency characteristic parameters, obtain the target position and target suction and blowing rate of the auxiliary round rod according to the vibration response frequency characteristic parameters, and send the instruction to the control module; the control module is used to control the rotating component to rotate the auxiliary round rod to the target position, and control the suction and blowing mechanism to perform suction and blowing through the small hole at the target suction and blowing rate.

2. The auxiliary cylindrical device for active suction and blowing as claimed in claim 1, characterized in that: The rotating assembly includes an inner ring, an outer ring, and a rotating mechanism. The inner ring is detachably mounted on the main cylindrical structure, the outer ring is mounted on the inner ring, the fixing mechanism is fixed on the outer ring, and the rotating mechanism is connected to the outer ring to drive the outer ring to rotate relative to the inner ring.

3. The auxiliary cylindrical device for active suction and blowing as claimed in claim 2, characterized in that: The rotating mechanism comprises a motor and a transmission mechanism, wherein the motor is connected to the transmission mechanism, and the transmission mechanism is connected to the outer ring, so that the motor drives the outer ring to rotate through the transmission mechanism.

4. The auxiliary cylindrical device for active suction and blowing as claimed in claim 2, characterized in that: The inner ring and the outer ring are both half-spliced ​​structures, and the inner ring and the outer ring are correspondingly provided with a slide rail and slide groove structure.

5. The auxiliary cylindrical device for active suction and blowing as claimed in claim 1, characterized in that: The fixing mechanism includes a cylindrical fixing part, which is sleeved on the auxiliary round rod so that the auxiliary round rod can rotate by itself; the end of the auxiliary round rod is connected to a rotating mechanism, which is used to drive the auxiliary round rod to rotate by itself; the processing module is also used to obtain the target angle of the auxiliary round rod; the control module is also used to control the rotating mechanism to rotate the auxiliary round rod to the target angle.

6. A control method for an auxiliary cylindrical device for active suction and blowing according to any one of claims 1 to 5, characterized in that: include: The monitoring module obtains the vibration displacement, wind speed and wind direction angle at different positions of the main cylindrical structure, and sends the monitoring results to the processing module; The processing module determines whether the vibration displacement response exceeds the limit value based on the vibration displacement, wind speed and wind direction angle. If so, the vibration response frequency characteristic parameters are obtained, and the target position of the auxiliary round rod and the target suction and blowing rate are obtained according to the vibration response frequency characteristic parameters, and the instruction is sent to the control module; the control module controls the rotating component to rotate the auxiliary round rod to the target position, and controls the suction and blowing mechanism to perform suction and blowing through the small hole at the target suction and blowing rate.

7. The control method of the auxiliary cylindrical device for active suction and blowing according to claim 6, characterized in that: The method of obtaining the target position of the subsidiary round rod and the target suction and blowing rate according to the vibration response frequency characteristic parameters includes: the processing module stores a database composed of existing test results and CFD numerical simulation results, the database contains the relationship between the vibration response frequency characteristic parameters and the target position of the subsidiary round rod and the target suction and blowing rate, and the processing module selects the target position of the subsidiary round rod and the target suction and blowing rate corresponding to the vibration response frequency characteristic parameters through the database.

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