Sma displacement amplification variable friction inerter damper

Abstract

The application belongs to the technical field of vibration control, and discloses a SMA displacement amplification variable friction inertial damper, which comprises a square box, a ball screw, a friction inertial system and a displacement amplification system; the friction inertial system comprises a sealing plate, a rotating friction block, a ball nut, a first thrust bearing and a fixed plate which are symmetrically arranged in sequence on the ball screw; the displacement amplification system comprises SMA filaments, a gear system and a sliding trolley which are symmetrically arranged on the upper and lower sides of the ball screw; the gear system comprises a pinion and two gear wheels which are located on the two sides of the pinion; the sliding trolley slides along the side wall of the square box; a plurality of groups of SMA filaments are arranged on the two sides of the sliding trolley; one end of the plurality of groups of SMA filaments is fixed to the sliding trolley, and the other end is fixed to the sealing plate. The application realizes displacement amplification of the SMA filaments, double efficiency of inertial mass and rotating friction energy dissipation, and can be self-adaptively adjusted according to the vibration size, and has superior damping performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vibration control, and particularly relates to an SMA displacement amplification variable friction inertial damper. BACKGROUND

[0002] Shape Memory Alloy (SMA) is a kind of intelligent metal sensing and driving material with excellent performance, which has unique shape memory effect, pseudo-elasticity performance of phase change and variable damping characteristics, and has no residual deformation, corrosion resistance, strain sensitivity and other characteristics, which makes it particularly suitable for making damping elements and reset elements.

[0003] The SMA damper is a displacement type damper, and its energy dissipation capacity is closely related to the displacement of the SMA element. However, the vibration displacement of general engineering structures is limited, which limits the energy dissipation capacity of the SMA damper. If the displacement of the SMA damper can be amplified, its energy dissipation capacity will be greatly increased.

[0004] Inertial vibration reduction refers to a vibration reduction technology taking an inertial mass as a core element, which generally needs to be combined with an energy dissipation element. The main forms of inertial mass include ball screw, gear and rack, lever mechanism and hydraulic type. Taking the ball screw as an example, it can convert the linear relative motion between the two ends of the structure into high-speed rotary motion of the flywheel, thereby realizing inertia efficiency. At the same time, the vibration inside the inertial vibration reduction system is not synchronized with the main structure, so that the deformation of the energy dissipation element can be amplified, and the energy dissipation efficiency is realized. However, the energy dissipation element matched with it often uses passive vibration reduction technology, which cannot self-adaptively adjust and control the force, thereby limiting the use of the inertial damper. SUMMARY

[0005] The purpose of the present application is to provide an SMA displacement amplification variable friction inertial damper, which realizes displacement amplification of SMA wire bundle, double efficiency of inertial mass and rotary friction energy dissipation, and can self-adaptively adjust according to the vibration size, and has superior vibration reduction performance.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] The present application provides an SMA displacement amplification variable friction inertial damper, which comprises a square box, a ball screw, a friction inertial system and a displacement amplification system.

[0008] The friction inertial system comprises a sealing plate, a rotary friction block, a ball nut, a first thrust bearing and a fixed plate which are symmetrically arranged in sequence in the ball screw; the sealing plate is slidably connected to the two ends of the square box, and the two ends of the fixed plate are fixed to the side wall of the square box.

[0009] The displacement amplification system comprises SMA wire bundles symmetrically arranged on both sides of the ball screw, a gear system and a sliding trolley; the gear system comprises a pinion and two gear wheels arranged on both sides of the pinion in series, the pinion is engaged with the ball screw, the sliding trolley slides along the side wall of the square box, two tooth grooves are formed on the sliding trolley, and the two gear wheels are engaged with the two tooth grooves respectively; a plurality of groups of SMA wire bundles are arranged on both sides of the sliding trolley, one end of the SMA wire bundles is fixed to the sliding trolley, and the other end is fixed to the sealing plate.

[0010] In one technical solution, the pinion and the two gear wheels are connected in series through a tension bolt, and the two ends of the tension bolt are fixed to the side wall of the square box.

[0011] In one technical solution, the gear system further comprises a second thrust bearing, and the second thrust bearing is arranged on both sides of the gear wheel.

[0012] In one technical solution, an L-shaped channel is formed on the sliding trolley, and one end of the SMA wire bundle fixed to the sliding trolley is located in the L-shaped channel.

[0013] In one technical solution, a roller is installed on the side wall of the sliding trolley in contact with the side wall of the square box.

[0014] In one technical solution, the SMA wire bundle is composed of a plurality of nickel-iron shape memory alloy wires.

[0015] Compared with the prior art, the beneficial effects of the present application are that:

[0016] The ball screw, the rotating friction block, the ball nut, the first thrust bearing and the sealing plate constitute a friction inerter system; the ball screw, the gear system, the sliding trolley and the SMA wire bundle constitute an SMA displacement amplification system, the switching of the pinion and the gear wheel in the gear system realizes the displacement amplification of the SMA wire bundle; the change of the pulling force of the SMA wire bundle changes the normal pressure of the friction sealing plate and the rotating friction plate, so that the friction force is adjusted; the ball screw makes the ball nut rotate together with the rotating friction block, so that the inertial mass and the rotating friction energy consumption are doubled, and the vibration can be adaptively adjusted according to the size of the vibration. The present application has the advantages of simple structure, wider application range and better damping performance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a main sectional view of an SMA displacement amplification variable friction inerter damper of the present application;

[0018] Figure 2 is a sectional view of the present application Figure 1 A-A direction;

[0019] Figure 3 is a sectional view of the present application Figure 1A partial sectional view along the middle BB direction;

[0020] Figure 4 This is the present invention. Figure 1 Cross-sectional view along the CC direction.

[0021] In the attached diagram, the following markings are used: 1 is the first sealing plate, 2 is the second sealing plate, 3 is the square housing, 4 is the ball screw, 5 is the first fixed plate, 6 is the second fixed plate, 7 is the first SMA wire bundle, 8 is the second SMA wire bundle, 9 is the sliding carriage, 10 is the rotating friction block, 11 is the ball nut, 12 is the first thrust bearing, 13 is the gear system, 14 is the tie bolt, 15 is the tooth groove, 16 is the pinion, 17 is the gear, and 18 is the second thrust bearing. Detailed Implementation

[0022] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of protection of the present invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art. Unless otherwise specified, the test methods in the following embodiments are conventional methods.

[0023] Example 1

[0024] like Figure 1 As shown, the present invention provides an SMA displacement amplification variable friction inertia capacitive damper, comprising a square housing 3, a ball screw 4, a friction inertia capacitive system, and a displacement amplification system.

[0025] The friction-capacitance system of the present invention includes a sealing plate, a rotating friction block 10, a ball nut 11, a first thrust bearing 12, and a fixing plate symmetrically arranged sequentially on a ball screw 4; the sealing plate is slidably connected to both ends of a square housing 3, and the two ends of the fixing plate are fixed to the side walls of the square housing 3. Figure 1 As shown, the sealing plate of the present invention includes a first sealing plate 1 on the left and a second sealing plate 2 on the right. The first sealing plate 1 and the second sealing plate 2 are U-shaped. The horizontal arms of the first sealing plate 1 and the second sealing plate 2 on the right have grooves. The grooves and the protrusions on the upper and lower side walls of the square box 3 form a fastening structure. In this way, under normal circumstances, since a rotating friction block 10, a ball nut 11 and a first thrust bearing 12 are also provided between the sealing plate and the fixed plate, and the protrusion is located on one side of the groove, when there is vibration and energy consumption, the first sealing plate 1 and the second sealing plate 2 can only move inward and cannot rotate or move outward. The rotating friction block 10 and the ball nut 11 are both circular and can only rotate.

[0026] The displacement amplification system of this invention includes SMA wire bundles symmetrically arranged on the upper and lower sides of a ball screw 4, a gear system 13, and a sliding carriage 9. The gear system 13 includes a small gear 16 connected in series and two large gears 17 located on either side of the small gear 16. The small gear 16 meshes with the ball screw 4. The sliding carriage 9 slides along the side wall of a square housing 3. Two toothed grooves 15 are formed on the sliding carriage 9, and the two large gears 17 mesh with the two toothed grooves 15 respectively. Multiple sets of SMA wire bundles are arranged on both sides of the sliding carriage 9. One end of each SMA wire bundle is fixed to the sliding carriage 9, and the other end is fixed to a sealing plate. Figure 1 As shown, the large gear 17 on the upper side meshes with the tooth groove 15, which prevents the sliding trolley 9 on the upper side from falling off. The small gear 16 meshes with the ball screw 4. When there is vibration and energy consumption, the small gear 16 rolls along the ball screw 3, thereby driving the large gear 17 to roll and then driving the sliding trolley 9 to slide along the side wall of the square box 3.

[0027] like Figure 2 and Figure 4 As shown, two sets of first SMA wire bundles 7 and two sets of second SMA wire bundles 8 are set on both sides of each sliding trolley 9. The SMA wire bundles are composed of multiple nickel-iron shape memory alloy wires, and the diameter and length of each nickel-iron shape memory alloy wire are equal.

[0028] like Figure 3 As shown, to fix the positions of the pinion 16 and the large gears 17 within the square housing 3, the pinion 16 and the two large gears 17 are connected in series by tie bolts 14, with both ends of the tie bolts 14 fixed to the side walls of the square housing 3. The gear system 13 also includes a second thrust bearing 18, located on both sides of the large gears 17. The second thrust bearing 18 rotates around the tie bolts 14, and dissipates energy through rotation when vibration occurs.

[0029] like Figure 1 As shown, in order to facilitate the adjustment of the length of the SMA filament bundle, an "L"-shaped channel is provided on the sliding carriage 9, and one end of the SMA filament bundle fixed to the sliding carriage 9 is located in the "L"-shaped channel.

[0030] like Figure 1 and Figure 2 As shown, the sliding trolley 9 slides along the left side wall, right side wall and top side wall, or the left side wall, right side wall and bottom side wall of the square box 3. To enable the sliding trolley 9 to slide smoothly, rollers are installed on the side walls of the sliding trolley 9 that are in contact with the side walls of the square box 3.

[0031] The working principle of the SMA displacement amplification variable friction inertia mass damper is as follows: when vibration occurs, the ball screw 4 moves left or right, and the ball screw 4 drives the upper and lower gear systems 13 to roll in opposite directions, while the upper and lower sliding trolleys 9 slide horizontally in the same direction at this time, the movement of the sliding trolleys 9 drives the first SMA wire bundle 7 or the second SMA wire bundle 8 to be tensioned and consumed, and due to the switching of the pinion 16 and the gear wheel 17, the displacement of the sliding trolley 9 is amplified, so that the displacement of the SMA wire is amplified; at the same time, due to the tension of the SMA wire bundle, the first sealing plate 1 or the second sealing plate 2 has a tendency to move inward, and with the increase of the tension of the SMA wire bundle, the friction between the friction sealing plate and the rotating friction plate 10 gradually increases, at the same time, the ball screw 4 makes the ball nut 11 rotate with the rotating friction block 10, realizing the double efficiency of inertia mass and rotating friction energy consumption; in addition, with the change of the strength of vibration, the SMA wire bundle tension and the rotating friction force change positively, realizing the adaptive variable friction control of vibration response.

[0032] The above-mentioned embodiments are only preferred embodiments of the present application, and are only used to explain the present application, and are not limited to the scope of the present application. For those skilled in the art, of course, other embodiments can be easily made by substitution or change according to the technical content disclosed in the present application, therefore, any changes and improvements made on the principle of the present application shall be included in the scope of the present application.

Claims

1. An SMA displacement amplification variable friction inerter damper, characterized by, The utility model relates to a square box (3), ball screw (4), frictional inerter system and displacement amplification system are included. The frictional inerter system includes the sealing plate, rotating friction block (10), ball nut (11), first thrust bearing (12) and fixed plate which are symmetrically sequentially arranged in the sealing plate of ball screw (4), the sealing plate is slidably connected with both ends of square box (3), and both ends of the fixed plate are fixed with the side wall of square box (3); The displacement amplification system includes SMA wire bundle, gear system (13) and sliding trolley (9) which are symmetrically arranged on the upper and lower sides of ball screw (4), the gear system (13) includes a pinion (16) and two gear wheels (17) which are located on both sides of the pinion (16), the pinion (16) is engaged with ball screw (4), the sliding trolley (9) slides along the side wall of square box (3), two tooth grooves (15) are formed in the sliding trolley (9), and two gear wheels (17) are engaged with two tooth grooves (15) respectively, a plurality of SMA wire bundles are arranged on both sides of the sliding trolley (9), one end of each SMA wire bundle is fixed with the sliding trolley (9), and the other end is fixed with the sealing plate.

2. The SMA displacement amplification variable-friction inerter damper of claim 1, wherein, The pinion (16) and two gear wheels (17) are connected in series through a tension bolt (14), and both ends of the tension bolt (14) are fixed with the side wall of square box (3).

3. The SMA displacement amplification variable-friction inerter damper according to claim 1 or 2, wherein, The gear system (13) further includes a second thrust bearing (18) which is located on both sides of the gear wheel (17).

4. The SMA displacement amplification variable-friction inerter damper of claim 1, wherein, The sliding trolley (9) is provided with an "L" shaped channel, and one end of the SMA wire bundle fixed with the sliding trolley (9) is located in the "L" shaped channel.

5. The SMA displacement amplification variable-friction inerter damper of claim 1, wherein, Rollers are installed on the side wall of the sliding trolley (9) which is in contact with the side wall of square box (3).

6. The SMA displacement amplification variable-friction inerter damper of claim 1, wherein, The SMA wire bundle is composed of a plurality of nickel-iron shape memory alloy wires.

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