Adjustable temperature memory alloy damper for wind power tower shock absorption

Abstract

The present application belongs to the technical field of wind power tower damping, and provides a temperature-adjustable memory alloy damper for wind power tower damping, comprising a plurality of damping components, the plurality of damping components being fixedly connected in sequence from top to bottom, and the plurality of damping components being arranged on the outer side of a wind power tower cylinder, wherein each damping component comprises a plurality of memory alloy damping mechanisms, the plurality of memory alloy damping mechanisms being distributed in the circumferential direction on the outer side of the wind power tower cylinder, each memory alloy damping mechanism comprising a memory alloy rod, both ends of the memory alloy rod being fixedly connected with the wind power tower cylinder through connecting mechanisms; a plurality of temperature adjusting mechanisms, each memory alloy rod being arranged on the inner side of each temperature adjusting mechanism, each temperature adjusting mechanism being provided with a heating element, and the heating element being used for heating the memory alloy rod to change the deformation performance of the memory alloy rod. The damping structure containing memory alloy is arranged on the outer side of the wind power tower cylinder, so as to improve the anti-seismic performance of the tower cylinder and reduce the construction difficulty.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind power tower damping, and particularly relates to a temperature-adjustable memory alloy damper for wind power tower damping. BACKGROUND

[0002] As a high-flexible structure, the wind power tower can be damaged by earthquakes and cause huge property losses. Therefore, taking engineering measures to improve the seismic capacity of the wind power tower is the key to reducing earthquake disasters and reducing personnel casualties and property losses during earthquakes.

[0003] As a new type of material, memory alloy (SMA) has many excellent properties. On the one hand, it is often used as a self-centering device in dampers and is often used in combination with friction dampers, tuned dampers, etc., and has a wide range of applications. However, such dampers have the problem of large overall size. On the other hand, the deformation performance of memory alloy (SMA) can be used for energy dissipation and seismic mitigation. Due to the structural requirements of the wind power tower, the internal space of the tower is limited, and enough space must be reserved for personnel to pass up and down. The size of the damper is limited when the damper is installed inside the tower, which increases the difficulty of adding the damper. SUMMARY

[0004] The purpose of the present application is to provide a temperature-adjustable memory alloy damper for wind power tower damping to solve the above problems. By providing a damper structure containing memory alloy outside the wind power sleeve, the seismic performance of the tower is improved and the construction difficulty is reduced.

[0005] To achieve the above purpose, the present application provides the following scheme: a temperature-adjustable memory alloy damper for wind power tower damping, comprising:

[0006] A plurality of damping components are fixedly connected in sequence from top to bottom, and a plurality of damping components are arranged on the outside of the wind power tower drum. The damping component comprises a plurality of memory alloy damping mechanisms, and a plurality of memory alloy damping mechanisms are distributed circumferentially on the outside of the wind power tower drum. The memory alloy damping mechanism comprises a memory alloy rod, and the two ends of the memory alloy rod are fixedly connected to the wind power tower drum through a connecting mechanism.

[0007] A plurality of temperature adjusting mechanisms are arranged on the inside of a plurality of memory alloy rods, and a heating element is arranged in the temperature adjusting mechanism. The heating element is used to heat the memory alloy rod to change the deformation performance of the memory alloy rod.

[0008] Preferably, the connecting mechanism comprises two connecting rods, one end of the two connecting rods is fixedly connected to the two ends of the memory alloy rod respectively, and the other end of the two connecting rods is fixedly connected to the wind power tower through an anchor.

[0009] Preferably, the anchor comprises a plurality of connecting flanges, the plurality of connecting flanges are coaxially fixedly connected to the wind power tower, the memory alloy rod is arranged between two adjacent connecting flanges, and one end of the connecting rod away from the memory alloy rod is fixedly connected to the connecting flange.

[0010] Preferably, the two ends of the connecting rod and the two ends of the memory alloy rod are respectively provided with threaded sections, one end of a first connector is threadedly connected to the two ends of the memory alloy rod respectively, and the other end of the first connector is threadedly connected to one end of the connecting rod.

[0011] Preferably, the edge of the connecting flange is provided with a plurality of outer ring holes, a second connector is fixedly and penetratingly arranged in the plurality of outer ring holes respectively, and one end of the connecting rod away from the memory alloy rod is threadedly connected to the second connector.

[0012] Preferably, the temperature adjusting mechanism comprises a temperature adjusting cylinder, the temperature adjusting cylinder is fixedly sleeved on the outer side of the memory alloy rod, and the heating element is arranged in the temperature adjusting cylinder.

[0013] Preferably, the heating element comprises an electric resistance wire, the electric resistance wire is fixedly connected to the inner wall of the temperature adjusting cylinder, and the electric resistance wire is used for heating the memory alloy rod.

[0014] Preferably, one end of a plurality of fixing rods is fixedly connected to the two ends of the temperature adjusting cylinder respectively, and the other end of the fixing rod is fixedly connected to the connecting rod through a fixing bolt.

[0015] Preferably, a solar panel is fixedly connected to the outer side of the temperature adjusting cylinder, and the solar panel is used for supplying power to the electric resistance wire.

[0016] Preferably, the memory alloy rod is made of nickel-titanium alloy material.

[0017] Compared with the prior art, the present application has the following advantages and technical effects: the main role of the several memory alloy component mechanisms is to be fixedly connected at the head and tail outside the wind power tower drum, avoiding occupying the internal space of the wind power tower drum, and meanwhile, a damping effect can be generated; the main role of the memory alloy rod is to improve the anti-seismic performance of the wind power tower drum through the good restoring force and toughness of the memory alloy rod; the main role of the temperature adjusting mechanism is to heat the memory alloy rod, change the deformation performance of the memory alloy rod by improving the temperature of the memory alloy rod, and improve the weather resistance and use efficiency. Overall, the present application can avoid occupying the limited internal space of the wind power tower drum by arranging the memory alloy damping mechanism around the outside of the wind power tower drum, reduce the labor cost, and meanwhile, the memory alloy damping mechanism has good energy dissipation capacity and anti-seismic performance by using the strong restoring force and toughness of the memory alloy, so as to improve the anti-seismic performance and durability of the wind power tower drum. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0019] Figure 1 It is a whole schematic diagram of the present application of installing the memory alloy damper for the wind power tower drum.

[0020] Figure 2 It is a schematic diagram of the connecting flange plate.

[0021] Figure 3 It is a connecting schematic diagram of the memory alloy rod and the connecting rod.

[0022] Figure 4 It is a schematic diagram of the temperature adjusting cylinder.

[0023] Figure 5 It is a sectional view schematic diagram of the temperature adjusting cylinder.

[0024] Figure 6 It is a connecting schematic diagram of the connecting flange plate, the wind power tower drum and the connecting rod.

[0025] Figure 7 It is a connecting schematic diagram of the connecting flange plate at the bottom and the connecting rod.

[0026] Figure 8 It is a stress-strain-temperature relationship diagram of the memory alloy.

[0027] Figure 9 It is a schematic diagram of the wind power tower drum fixedly connected on the vibration test bench in the second embodiment.

[0028] Figure 10 The schematic diagram of the wind power tower through the foundation and soil system arranged on the vibration test platform for example two;

[0029] Figure 11 The schematic diagram of the angle between the memory alloy damper and the direction of the incident seismic wave for example two;

[0030] 1, memory alloy rod; 2, connecting rod; 3, connecting flange; 31, outer ring hole; 4, first connector; 5, temperature adjusting cylinder; 6, fixing rod; 7, fixing bolt; 8, wind power tower; 81, tower section; 82, flange; 83, screw hole; 9, second connector; 10, locking nut. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] Embodiment one:

[0034] With reference to Figures 1-8 The present application provides a temperature-adjustable memory alloy damper for damping wind power towers, comprising:

[0035] A plurality of damping assemblies are fixedly connected in sequence from top to bottom, and are arranged on the outer side of the wind power tower 8. The damping assembly comprises a plurality of memory alloy damping mechanisms, which are distributed circumferentially on the outer side of the wind power tower 8. The memory alloy damping mechanism comprises a memory alloy rod 1, and the two ends of the memory alloy rod 1 are fixedly connected with the wind power tower 8 through connecting mechanisms;

[0036] A plurality of temperature adjusting mechanisms are arranged on the inner side of the plurality of memory alloy rods 1. The temperature adjusting mechanism is provided with a heating element for heating the memory alloy rod 1 to change the deformation performance of the memory alloy rod 1.

[0037] The main function of the several memory alloy component mechanisms is to be fixedly connected at the head and tail on the outside of the wind power tower drum, avoiding occupying the internal space of the wind power tower drum, and meanwhile, a damping effect can be generated; the main function of the memory alloy rod 1 is to improve the anti-seismic performance of the wind power tower drum 8 through the good restoring force and toughness of the memory alloy rod 1; the main function of the temperature adjusting mechanism is to heat the memory alloy rod 1, change the deformation performance of the memory alloy rod 1 by improving the temperature of the memory alloy rod 1, improve the weather resistance and use efficiency. Overall, the memory alloy damping mechanism is arranged around the outside of the wind power tower drum, the internal limited space of the wind power tower drum can be avoided to be occupied, the artificial cost is reduced, meanwhile, the memory alloy damping mechanism has good energy dissipation capacity and anti-seismic performance by using the strong restoring force and toughness of the memory alloy, so that the anti-seismic performance and durability of the wind power tower drum are improved.

[0038] Further optimization scheme, the connecting mechanism includes two connecting rods 2, one end of the two connecting rods 2 is fixedly connected at the two ends of the memory alloy rod 1 respectively, the other end of the two connecting rods 2 is fixedly connected on the wind power tower drum 8 through an anchor.

[0039] As shown in Figure 1 , by connecting the connecting rod 2 at the two ends of the memory alloy rod 1 and connecting with the wind power tower drum 8, good damping effect can be achieved with less memory alloy material.

[0040] Further optimization scheme, the anchor includes several connecting flanges 3, the several connecting flanges 3 are coaxially fixedly connected on the wind power tower drum 8 respectively, the memory alloy rod 1 is arranged between two adjacent connecting flanges 3, and the end of the connecting rod 2 away from the memory alloy rod 1 is fixedly connected on the connecting flange 3.

[0041] Further optimization scheme, the wind power tower drum 8 is composed of several tower drum segments 81, the top and bottom of the tower drum segment 81 are fixedly connected with flanges 82 respectively, a plurality of screw holes 83 are formed on the connecting flange 3, and the flange 82 is fixedly connected on the connecting flange 3 through bolts.

[0042] As shown in Figure 1 and Figure 7 , one group of tower drum segments 81 is arranged on the two sides of the connecting flange 3 respectively, the flanges 82 on the two groups of tower drum segments 81 close to each other are attached to the connecting flange 3 and connected with each other through bolts, so that the connecting flange 3 and the tower drum segment 81 are fixedly connected, and meanwhile, the several tower drum segments 81 can be combined into the wind power tower drum 8.

[0043] Further optimization scheme, the two ends of the connecting rod 2 and the two ends of the memory alloy rod 1 are provided with threaded sections respectively, one end of the first connector 4 is threadedly connected with the two ends of the memory alloy rod 1 respectively, and the other end of the first connector 4 is threadedly connected with one end of the connecting rod 2.

[0044] As shown in Figure 3 , the first connector 4 connects the memory alloy rod 1 and the connecting rod 2 by screwing, so that the memory alloy rod 1 and the connecting rod 2 form a whole.

[0045] Further optimization scheme, the edge of the connecting flange plate 3 is provided with a plurality of outer ring holes 31, a second connector 9 is fixedly arranged in each of the plurality of outer ring holes 31, and the end of the connecting rod 2 away from the memory alloy rod 1 is screwed with the second connector 9.

[0046] As shown in Figure 2 , the plurality of outer ring holes 31 are located outside the plurality of screw holes 83.

[0047] As shown in Figure 6 , the second connector 9 has the same structure as the first connector 4, and the connecting rods 2 on the same axis on the two sides of the connecting flange plate 3 are fixedly connected through the second connector 9, so as to ensure the integrity of the damping structure.

[0048] Further optimization scheme, as shown in Figure 1 and Figure 7 , the top of the connecting rod 2 at the top end penetrates the outer ring hole 31 of the connecting flange plate 3 at the uppermost layer of the wind power tower drum 8 and is screwed with a locking nut 10, and the bottom of the connecting rod 2 at the bottom end penetrates the outer ring hole 31 of the connecting flange plate 3 at the lowermost layer and is screwed with a locking nut 10. Thus, the connecting rod 2 and the memory alloy rod 1 form a whole vertically outside the wind power tower drum 8, and the damping effect is achieved with less memory alloy material.

[0049] Further optimization scheme, the temperature adjusting mechanism includes a temperature adjusting cylinder 5, the temperature adjusting cylinder 5 is fixedly arranged outside the memory alloy rod 1, and a heating element is arranged in the temperature adjusting cylinder 5.

[0050] Further optimization scheme, the heating element includes a resistance wire, the resistance wire is fixedly connected to the inner wall of the temperature adjusting cylinder 5, and the resistance wire is used for heating the memory alloy rod 1.

[0051] As shown in Figure 4 , air inlets are arranged at the two ends of the temperature adjusting cylinder 5. By adjusting the temperature of the resistance wire, the temperature of the memory alloy rod 1 can be changed, and thus the deformation performance of the memory alloy rod 1 can be changed.

[0052] Further optimization scheme, as shown in Figure 8 , the essence of SMA shape memory alloy is the process of mutual transformation of micro Austenite phase and Martensite phase under stress or temperature excitation. The process of Austenite cooling to generate Martensite is called positive phase change, and the Martensite phase change starting temperature is defined as M s , and the ending temperature is defined as M f , and similarly, A s and Af The twinned martensite is reoriented (de-twinning) to non-twin martensite after loading, and during unloading, the martensite gradually transforms to austenite while recovering the deformation occurred during stretching, most of the strain can be recovered after unloading, which macroscopically shows that the SMA shape memory alloy restores the original shape. If the SMA shape memory alloy is in the martensite state of stretching, the temperature is increased to T>A f The martensite is also converted to austenite, so that the recovery performance of the SMA shape memory alloy can be changed by changing the temperature.

[0053] In a further optimized scheme, the control unit is further arranged in the wind power tower 8, and the control unit can adjust the heating power of the resistance wire. The operator can change the heating power of the resistance wire through the control unit, so as to adjust the temperature of the memory alloy rod 1.

[0054] In a further optimized scheme, the two ends of the temperature adjusting cylinder 5 are respectively fixedly connected with one end of a plurality of fixing rods 6, and the other end of the fixing rod 6 is fixedly connected to the connecting rod 2 through a fixing bolt 7.

[0055] As shown in FIGS. 1, 2 and 3, a plurality of fixing rods 6 are arranged on the temperature adjusting cylinder 5, and the other end of the fixing rod 6 is fixedly connected to the connecting rod 2 through a fixing bolt 7. Figure 4 Figure 5 As shown in FIGS. 1, 2 and 3, a plurality of fixing rods 6 are arranged on the temperature adjusting cylinder 5, and the other end of the fixing rod 6 is fixedly connected to the connecting rod 2 through a fixing bolt 7.

[0056] In a further optimized scheme, a solar panel is fixedly connected to the outside of the temperature adjusting cylinder 5, and the solar panel is used to supply power to the resistance wire.

[0057] In a further optimized scheme, the memory alloy rod 1 is made of nickel-titanium alloy material.

[0058] Embodiment two:

[0059] In this embodiment, a wind power tower 8 with a total height of 2.2 m is taken as a prototype for illustration. The model is provided with three tower segments 81, and the heights of the tower segments 81 from bottom to top are 0.4 m, 0.9 m and 0.9 m respectively, and the thicknesses of the tower segments 81 are 4 mm, 3 mm and 3 mm respectively. The thicknesses of the connecting flanges 3 are all 10 mm, and six screw holes 83 are uniformly distributed along the circumference of the connecting flanges 3 for butt joint of the tower segments 81. Four outer ring holes 31 are arranged on the connecting flanges 3 at intervals of 90°.

[0060] At the same time, the diameter of the memory alloy rod 1 is the same as the diameter of the connecting rod 2, which is 8 mm. The distance between the center of the outer ring hole 31 and the edge of the connecting flange 3 is 10 mm. The outer diameter of the temperature adjusting cylinder 5 is 15 mm, and the inner diameter of the temperature adjusting cylinder 5 is 12 mm. The connecting rod 2 is made of Q235 steel.

[0061] The memory alloy damper of the present application is fixed on the wind power tower 8 for a shaking table test, and the test arrangement is as follows​Figure 9 and Figure 10 As shown, and as Figure 11 The direction of the seismic wave applied during the test is at a 45° angle to the direction of the seismic wave. During the test, a unidirectional seismic wave was applied to the bottom of the tower. The tower top acceleration and displacement response under the condition of maximum seismic wave amplitude PGA = 0.8g are listed in Tables 1 and 2. Comparing the structural responses with and without SMA dampers, it was found that in the fixed connection condition, the peak acceleration and displacement at the tower top were reduced by up to 30.55% and 32.57% respectively, while in the flexible connection condition, they were reduced by up to 19.20% and 27.62%. This indicates that regardless of whether "soil-structure interaction" is considered, adding an SMA damper has a significant vibration reduction effect on wind turbine towers.

[0062] Table 1 Peak acceleration response at the top of the tower when PGA = 0.8g

[0063]

[0064] Table 2 shows the peak value of the tower top displacement response when PGA = 0.8g.

[0065]

[0066] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0067] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A temperature-adjustable memory alloy damper for damping wind power tower, characterized in that , comprising: A plurality of damping assemblies are sequentially fixedly connected from top to bottom, and are arranged on the outer side of the wind power tower drum (8), the damping assembly comprises a plurality of memory alloy damping mechanisms, the memory alloy damping mechanisms are circumferentially distributed on the outer side of the wind power tower drum (8), and the memory alloy damping mechanism comprises a memory alloy rod (1), both ends of the memory alloy rod (1) are fixedly connected with the wind power tower drum (8) through connecting mechanisms; A plurality of temperature adjusting mechanisms, a plurality of memory alloy rods (1) are arranged on the inner side of a plurality of temperature adjusting mechanisms respectively, a heating element is arranged in the temperature adjusting mechanism, and the heating element is used for heating the memory alloy rod (1) to change the deformation performance of the memory alloy rod (1); The connecting mechanism comprises two connecting rods (2), one end of each of the two connecting rods (2) is fixedly connected with both ends of the memory alloy rod (1), and the other end of each of the two connecting rods (2) is fixedly connected with the wind power tower drum (8) through an anchor. The anchor comprises a plurality of connecting flanges (3), the connecting flanges (3) are coaxially fixedly connected with the wind power tower drum (8), the memory alloy rod (1) is arranged between two adjacent connecting flanges (3), and one end of the connecting rod (2) away from the memory alloy rod (1) is fixedly connected with the connecting flange (3). The temperature adjusting mechanism comprises a temperature adjusting cylinder (5), the temperature adjusting cylinder (5) is fixedly sleeved on the outer side of the memory alloy rod (1), and the heating element is arranged in the temperature adjusting cylinder (5). The heating element comprises an electric resistance wire, the electric resistance wire is fixedly connected to the inner wall of the temperature adjusting cylinder (5), and the electric resistance wire is used for heating the memory alloy rod (1).

2. The temperature-adjustable memory alloy damper for shock absorption of a wind power tower according to claim 1, characterized in that: Both ends of the connecting rod (2) and both ends of the memory alloy rod (1) are respectively provided with threaded sections, one end of a first connector (4) is threadedly connected with both ends of the memory alloy rod (1) respectively, and the other end of the first connector (4) is threadedly connected with one end of the connecting rod (2).

3. The temperature-adjustable memory alloy damper for shock absorption of a wind power tower according to claim 2, characterized in that: The edge of the connecting flange (3) is provided with a plurality of outer ring holes (31), a second connector (9) is fixedly arranged in each of the outer ring holes (31), and one end of the connecting rod (2) away from the memory alloy rod (1) is threadedly connected with the second connector (9).

4. The temperature-adjustable memory alloy damper for shock absorption of a wind power tower according to claim 1, characterized in that: One end of a plurality of fixing rods (6) is fixedly connected with both ends of the temperature adjusting cylinder (5) respectively, and the other end of the fixing rod (6) is fixedly connected with the connecting rod (2) through a fixing bolt (7).

5. The temperature-adjustable memory alloy damper for shock absorption of a wind power tower according to claim 1, characterized in that: A solar panel is fixedly connected to the outer side of the temperature adjusting cylinder (5), and the solar panel is used for supplying power to the electric resistance wire.

6. The temperature-adjustable memory alloy damper for shock absorption of a wind power tower according to claim 1, characterized in that: The memory alloy rod (1) is made of nickel-titanium alloy material.

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