CN112538907B - Double-inertia-capacity parallel type four-order vibration reduction structure - Google Patents
Double-inertia-capacity parallel type four-order vibration reduction structure Download PDFInfo
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- CN112538907B CN112538907B CN202011178256.3A CN202011178256A CN112538907B CN 112538907 B CN112538907 B CN 112538907B CN 202011178256 A CN202011178256 A CN 202011178256A CN 112538907 B CN112538907 B CN 112538907B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- 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
- E04H9/14—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 against other dangerous influences, e.g. tornadoes, floods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/80—Arrangement of components within nacelles or towers
- F03D80/88—Arrangement of components within nacelles or towers of mechanical components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/4433—Floating structures carrying electric power plants
- B63B2035/446—Floating structures carrying electric power plants for converting wind energy into electric energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a double-inertia-capacity parallel type four-order vibration damping structure which comprises a two-stage second-order vibration damping structure, wherein the two-stage second-order vibration damping structure is divided into a first-stage second-order vibration damping structure and a second-stage second-order vibration damping structure; the first-stage second-order vibration reduction structure and the second-stage second-order vibration reduction structure both comprise a spring, an inertial volume and a damper and are in a series or series-parallel connection integrated form of 'spring-damper-inertial volume'; and the upper end point and the lower end point of the first-stage second-order vibration damping structure are respectively connected with the upper end point and the lower end point of the second-stage second-order vibration damping structure to form a double-inertia-capacitor parallel-type fourth-order vibration damping structure. The invention can effectively improve the damping ratio and the vibration reduction effect of the fan system.
Description
Technical Field
The invention belongs to the technical field of vibration reduction of offshore wind turbines, and particularly relates to a double-inertia-capacity parallel type four-order vibration reduction structure.
Background
With the gradual increase of the single-machine power of the offshore wind turbine, the mass of the engine room, the impeller, the floating platform and the height of the tower barrel are increased continuously. The tower drum made of the flexible material can greatly reduce the weight of the tower drum under the condition of high height, reduce the production cost of the tower drum and improve the economic applicability of the wind turbine, so that the flexible tower drum is widely applied to large offshore wind driven generators. However, the material characteristics of the flexible tower barrel determine that the amplitude of the tower barrel and the pitch angle of the platform are increased under the condition of external wind and wave load of the offshore wind turbine, the reliability of the wind generating set is affected, and the overall service life of the wind generating set is threatened. Therefore, the design of the vibration reduction structure of the offshore wind turbine becomes an important research content in the technical field of wind power.
At present, a Tuned Mass Damper (TMD) is mainly used as a device for damping vibration of an offshore wind turbine, and the vibration damping principle of the device is to adjust the vibration frequency of a mass block to the main vibration frequency of a wind turbine structure, and realize energy transfer from the wind turbine structure to the mass block and the damper through the interaction between the TMD and the wind turbine structure, so that the vibration damping purpose is achieved. The proposal of the inertial container concept leads the similar theory of a mechanical system and a circuit system to be more complete, thereby laying a foundation for the vibration reduction structure to break through the traditional spring-damping vibration reduction system configuration and providing a new idea for the development of the vibration reduction mechanical structure. The inerter is a mechanical element which has two end points which can freely move relatively, and the force acting on the two end points is proportional to the relative acceleration of the two end points. The new inertial capacitance-spring-damping vibration reduction structure network provided based on the inertial capacitance element breaks through the restriction bottleneck of further improving the vibration reduction performance of the classical spring-damping structure network, so that the mechanical structure for reducing the vibration of the wind driven generator is not limited to a TMD device or a similar mode thereof any more.
The traditional TMD device is limited to a spring, a damping and a mass block in a simple combination mode, the vibration reduction effect of the fan is greatly limited, and the self volume and the mass block are overlarge, so that the internal space of a cabin is excessively occupied, and certain burden is caused to the fan structure. Compared with the traditional TMD device, the damping device containing the inertial container has better damping effect and can effectively reduce the linear stroke of the damping device, thereby reducing the volume of the device. And the mass synergy of the inertia capacitance element can reduce the mass of the mass block in the vibration damper. At present, a vibration damping device containing an inertial container is successfully applied to a vehicle suspension system, and a good vibration damping effect is achieved.
Disclosure of Invention
The invention aims to provide a double-inertia-capacity parallel type four-order vibration damping structure so as to improve the damping ratio and the vibration damping effect of a fan system.
The technical solution for realizing the purpose of the invention is as follows:
a double-inertia-capacity parallel type four-order vibration damping structure comprises a two-stage second-order vibration damping structure, wherein the two-stage second-order vibration damping structure is divided into a first-stage second-order vibration damping structure and a second-stage second-order vibration damping structure; the first-stage second-order vibration reduction structure and the second-stage second-order vibration reduction structure both comprise a spring, an inertial volume and a damper and are in a series or series-parallel connection integrated form of 'spring-damper-inertial volume'; and the upper end point and the lower end point of the first-stage second-order vibration damping structure are respectively connected with the upper end point and the lower end point of the second-stage second-order vibration damping structure to form a double-inertia-capacitor parallel-type fourth-order vibration damping structure.
Compared with the prior art, the invention has the following remarkable advantages:
(1) according to the vibration reduction and isolation characteristics of the spring and the inerter, the two vibration reduction and isolation systems connected in parallel are superposed to suppress structural vibration of the offshore wind turbine caused by external wind and wave loads, and the damper is added to the vibration reduction and isolation systems to dissipate energy stored in the vibration reduction structure.
(2) By optimizing the spring stiffness, the damping coefficient and the inertia capacity in the double-inertia-capacity parallel type four-order vibration damping structure, the vibration damping evaluation indexes of the offshore wind driven generator are as follows: the displacement of the tower top and the pitching performance of the platform are improved, and the time domain response under the external wind and wave load is improved.
Drawings
Fig. 1 is a schematic view of a dual inerter parallel type four-order vibration damping structure in embodiment 1.
Fig. 2 is a schematic view of a dual inerter parallel type four-order vibration damping structure in embodiment 2.
Fig. 3 is a schematic view of a dual inerter parallel type four-order vibration damping structure in embodiment 3.
Fig. 4 is a schematic view of a dual inertance parallel type four-order vibration damping structure of embodiment 4.
Fig. 5 is a schematic view of a dual inerter parallel type fourth-order damping structure of embodiment 5.
Fig. 6 is a schematic view of a dual inerter parallel type fourth-order vibration damping structure of embodiment 6.
FIG. 7 is a schematic diagram of the arrangement of the double inerter parallel four-order vibration reduction structure in the fan cabin.
FIG. 8 is a graph comparing the time domain response of the pitch of the wind turbine platform before and after the addition of the damping structure of the present invention in example 7.
Fig. 9 is a comparison graph of the time domain response of the top displacement of the tower of the blower before and after the vibration reduction structure of the present invention is added in example 7.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
The invention discloses a double-inertia-capacity parallel type four-order vibration damping structure which comprises a two-stage second-order vibration damping structure, wherein the two-stage second-order vibration damping structure is divided into a first-stage second-order vibration damping structure 1 and a second-stage second-order vibration damping structure 2; the first-stage second-order vibration reduction structure 1 and the second-stage second-order vibration reduction structure 2 are both in a series or series-parallel connection integrated form of 'spring-damping-inertial capacity'; and the upper end point and the lower end point of the first-stage second-order vibration damping structure 1 are respectively connected with the upper end point and the lower end point of the second-stage second-order vibration damping structure 2 to form a double-inertia-capacity parallel type fourth-order vibration damping structure.
Example 1
The first-stage second-order vibration damping structure 1 includes: a first-stage spring k1, a first-stage inertia capacity b1 and a first-stage damping c 1; the spring k1, the inertia capacity b1 and the damping c1 of the first-stage second-order vibration reduction structure 1 are connected in series;
the second-stage second-order vibration damping structure 2 includes: a second-stage spring k2, a second-stage inertia capacity b2 and a second-stage damping c 2; and the spring k2 of the second-stage second-order vibration attenuation structure 2 is connected with the damping c2 in parallel and then connected with the inertia capacitor b2 in series.
Example 2
The first-stage second-order vibration damping structure 1 includes: a first-stage spring k1, a first-stage inertia capacity b1 and a first-stage damping c 1; the spring k1, the inertia capacity b1 and the damping c1 of the first-stage second-order vibration reduction structure 1 are connected in series;
the second-stage second-order vibration damping structure 2 includes: a second-stage spring k2, a second-stage inertia capacity b2 and a second-stage damping c 2; and the spring k2, the inertia capacity b2 and the damping c2 of the second-stage second-order vibration damping structure 2 are connected in series.
Example 3
The first-stage second-order vibration damping structure 1 includes: a first-stage spring k1, a first-stage inertia capacity b1 and a first-stage damping c 1; the spring k1 of the first-stage second-order vibration reduction structure 1 is connected with the damping c1 in parallel and then connected with the inertia capacitor b1 in series;
the second-stage second-order vibration damping structure 2 includes: a second-stage spring k2, a second-stage inertia capacity b2 and a second-stage damping c 2; and the spring k2 of the second-stage second-order vibration damping structure 2 is connected with the damping c2 in parallel and then connected with the inertia capacitor b2 in series.
Example 4
The first-stage second-order vibration damping structure 1 includes: a first-stage spring k1, a first-stage inertia capacity b1 and a first-stage damping c 1; the inertia volume b1 of the first-stage second-order vibration reduction structure 1 is connected with the damping c1 in parallel and then connected with the spring k1 in series;
the second-stage second-order vibration damping structure 2 includes: a second-stage spring k2, a second-stage inertia capacity b2 and a second-stage damping c 2; and the inerter b2 of the second-stage second-order vibration attenuation structure 2 is connected with the damper c2 in parallel and then connected with the spring k2 in series.
Example 5
The first-stage second-order vibration damping structure 1 includes: a first-stage spring k1, a first-stage inertia capacity b1 and a first-stage damping c 1; the spring k1 of the first-stage second-order vibration reduction structure 1 is connected with the damping c1 in parallel and then connected with the inertia capacitor b1 in series;
the second-stage second-order vibration damping structure 2 includes: a second-stage spring k2, a second-stage inertia capacity b2 and a second-stage damping c 2; and the inerter b2 of the second-stage second-order vibration attenuation structure 2 is connected with the damper c2 in parallel and then connected with the spring k2 in series.
Example 6
The first-stage second-order vibration damping structure 1 includes: a first-stage spring k1, a first-stage inertia capacity b1 and a first-stage damping c 1; the spring k1, the inertia capacity b1 and the damping c1 of the first-stage second-order vibration reduction structure 1 are connected in series;
the second-stage second-order vibration damping structure 2 includes: a second-stage spring k2, a second-stage inertia capacity b2 and a second-stage damping c 2; and the inerter b2 of the second-stage second-order vibration attenuation structure 2 is connected with the damper c2 in parallel and then connected with the spring k2 in series.
Example 7
FIG. 7 is a diagram of an arrangement of a vibration reduction device of an offshore wind turbine nacelle and a double inerter parallel type four-order vibration reduction structure. The double-inertance parallel type four-order vibration damping structure is connected with a vibration damping device of the fan in parallel, and the vibration damping device of the fan consists of a spring ka, a damping ca and a mass block ma; the spring ka and the damping ca are connected between the inner wall of the fan cabin and the mass block ma in parallel; the mass ma is formed, wherein ka is 5000N/m, ca is 9000Ns/m and ma is 20000 kg. The upper end of the double-inertance parallel type four-order vibration reduction structure in the form of embodiment 1 of the invention is connected with the inner wall of the cabin of the offshore wind turbine, and the lower end is connected with a mass block ma of a built-in vibration reduction device of the offshore wind turbine.
By optimizing the parameters of the springs k1 and k2, the dampers c1 and c2, and the inertia elements b1 and b2, k 1-12.2 KN/m, k 2-46.6 KN/m, c 1-411.4 Nm/s, c 2-259.8 Nm/s, b 1-189.2 kg, and b 2-5297.7 kg are taken. The wind turbine high simulation software FAST and Matlab are used for combined simulation, and the time domain response comparison graphs of pitching and tower top displacement of the offshore wind turbine platform before and after the vibration reduction structure is added under the interference of external wind waves with the average wind speed of 10m/s and the wave height of 2.3m are shown in fig. 8 and 9. As can be seen from the figure, the dual-inertance parallel type four-order vibration reduction structure enables numerical values at time domain response wave crests of pitching and tower top displacement of the fan platform to be reduced. The invention can effectively improve the structural vibration performance of the offshore wind turbine under external wind and wave loads.
The first-stage inerter b1 and the second-stage inerter b2 in embodiments 1 to 7 can be a mechanical inerter, a rack and pinion inerter, a ball screw inerter, a hydraulic motor inerter, or an electromechanical inerter; the first-stage spring k1 and the second-stage spring k2 can be torsion bar springs, spiral springs or hydro-pneumatic springs; the first stage damping c1 and the second stage damping c2 may be hydraulic dampers or friction dampers.
Claims (8)
1. A double-inertance parallel type four-order vibration damping structure is characterized by comprising a two-stage second-order vibration damping structure, wherein the two-stage second-order vibration damping structure is divided into a first-stage second-order vibration damping structure and a second-stage second-order vibration damping structure; the first-stage second-order vibration reduction structure and the second-stage second-order vibration reduction structure both comprise a spring, an inertial volume and a damper and are in a series or series-parallel connection integrated form of 'spring-damper-inertial volume'; the upper end point and the lower end point of the first-stage second-order vibration damping structure are respectively connected with the upper end point and the lower end point of the second-stage second-order vibration damping structure to form a double-inertance parallel type fourth-order vibration damping structure;
the spring, the inertia capacitor and the damping of the first-stage second-order vibration reduction structure are connected in series;
the inertia capacitor and the damping of the second-stage second-order vibration attenuation structure are connected in parallel and then connected in series with the spring;
the double-inerter parallel type four-order vibration reduction structure is used for reducing vibration of an offshore wind turbine, the double-inerter parallel type four-order vibration reduction structure is connected with a vibration reduction device of the wind turbine in parallel, and the vibration reduction device of the wind turbine consists of a spring ka, a damping ca and a mass block ma; the spring ka and the damping ca are connected between the inner wall of the fan cabin and the mass block ma in parallel; the upper end of the double-inertia-capacity parallel type four-order vibration reduction structure is connected with the inner wall of the fan engine room, and the lower end of the double-inertia-capacity parallel type four-order vibration reduction structure is connected with a mass block ma of a vibration reduction device arranged in the fan engine room.
2. The parallel type double inerter four-order vibration damping structure according to claim 1,
the spring, the inertia capacitor and the damping of the first-stage second-order vibration reduction structure are connected in series;
and the spring of the second-stage second-order vibration reduction structure is connected with the damping in parallel and then connected with the inertial container in series.
3. The parallel type double inerter four-order vibration damping structure according to claim 1,
the spring, the inertia capacitor and the damping of the first-stage second-order vibration reduction structure are connected in series;
and the spring, the inertia capacitor and the damping of the second-stage second-order vibration reduction structure are connected in series.
4. The parallel type double inerter four-order vibration damping structure according to claim 1,
the spring of the first-stage second-order vibration attenuation structure is connected with the damper in parallel and then connected with the inertial container in series;
and the spring of the second-stage second-order vibration reduction structure is connected with the damping in parallel and then connected with the inertial container in series.
5. The parallel type double inerter four-order vibration damping structure according to claim 1,
the inertia capacitor and the damping of the first-stage second-order vibration attenuation structure are connected in parallel and then connected in series with the spring;
and the inertia capacitor and the damping of the second-stage second-order vibration reduction structure are connected in parallel and then connected in series with the spring.
6. The parallel type double inerter four-order vibration damping structure according to claim 1,
the spring of the first-stage second-order vibration attenuation structure is connected with the damper in parallel and then connected with the inertial container in series;
and the inertia capacitor and the damping of the second-stage second-order vibration reduction structure are connected in parallel and then connected in series with the spring.
7. A parallel double inerter four-order vibration damping structure according to any one of claims 1 to 6, wherein the inerter is a mechanical inerter, a rack and pinion inerter, a ball screw inerter, a hydraulic motor inerter, or an electromechanical inerter.
8. A parallel double inerter four-order vibration damping structure according to any one of claims 1 to 6, wherein the spring in the vibration damping structure is a torsion bar spring, a helical spring or a hydro-pneumatic spring; the damping in the vibration damping structure is a hydraulic damper or a friction damper.
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| CN101994776A (en) * | 2010-09-14 | 2011-03-30 | 江苏大学 | Two-free endpoint dynamic vibration absorber |
| CN103470676A (en) * | 2013-09-17 | 2013-12-25 | 中国北方车辆研究所 | Inertia mass energy accumulation type vibration isolation device with parallel connected dampers |
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