Electromagnetic damping nonlinear vibration isolator with double-coil structure

Abstract

The invention discloses an electromagnetic damping nonlinear vibration isolator with a double-coil structure. The electromagnetic damping nonlinear vibration isolator comprises a rigid structure and a damping structure which are matched with each other, the damping structure comprises a top cover, a first left limiting part, a first right limiting part, a first magnetic material, a first coil, a second right limiting part, a base, a second coil, a second left limiting part, a second magnetic material, a base connecting shaft and a part connecting shaft. The first left limiting component, the second left limiting component, the first right limiting component and the second right limiting component are arranged on the base. The nonlinear electromagnetic vibration isolator has the characteristics of damping nonlinearity, adjustable damping, function conversion and the like, and the reliability problem of a common nonlinear vibration isolator under the working condition of low-frequency large-amplitude vibration is solved through the damping end, so that the vibration isolator shows a better vibration isolation effect under the working condition of low frequency.

Description

Technical Field

[0001] The invention relates to the technical field of vibration isolation, and specifically to an electromagnetic damping nonlinear vibration isolator with a double-coil structure. Background Art

[0002] The research on vibration isolation technology originated from the demand for ultra-precision manufacturing and measurement, aerospace exploration, transportation, weapons and equipment under extreme working conditions. These fields require equipment that can work in low-frequency and ultra-low-frequency environments, and traditional linear vibration isolation systems often cannot meet the needs in these environments. Linear vibration isolation systems usually only have a good suppression effect on vibrations in the medium and high frequency bands, but it is often difficult to effectively isolate micro-vibrations in the low-frequency area. At present, quasi-zero stiffness isolators are mainly used for small-amplitude vibration isolation, and there is still room for development in the field of large excitation. Most of the existing vibration isolation systems have a single function, and most of the vibration mechanical energy is dissipated and difficult to collect. Signal acquisition and vibration isolation layout are not conducive to active adjustment. The new nonlinear electromagnetic vibration isolator can meet higher requirements to a certain extent to maintain the normal operation of machinery, increase service life, and improve the safety and reliability of engineering structures.

[0003] For nonlinear electromagnetic isolators, the source of magnetic force is mainly permanent magnets, which generate damping by coupling with coils. Compared with other structural types of isolators, electromagnetic damping force is a non-contact force and has the advantage of energy conversion. In addition, active control or adjustment of damping can be achieved by externally connecting different circuits. Nonlinear electromagnetic isolators can be combined with energy harvesting technology and control technology to produce better vibration isolation effects and have excellent scalability. Summary of the invention

[0004] The present invention aims at solving the problems in the prior art and proposes an electromagnetic damping nonlinear vibration isolator with a double-coil structure. The present invention is implemented by the following technical solutions:

[0005] The present invention discloses an electromagnetic damping nonlinear vibration isolator with a double coil structure, which comprises a rigid structure and a damping structure that cooperate with each other; the damping structure comprises a top cover 1, a first left limit component 2, a first right limit component 5, a first magnetic material 7, a first coil 8, a second right limit component 9, a base 10, a second coil 15, a second left limit component 16 and a second magnetic material 17, a base connecting shaft and a component connecting shaft;

[0006] The first left limiting component 2, the second left limiting component 16, the first right limiting component 5, and the second right limiting component 9 are arranged on the base 10, and the first magnetic material 7 and the second magnetic material 17 are fixedly arranged on the top cover 1, are sleeved with the top cover 1, and are embedded in the groove of the top cover 1; the base 10 and the top cover 1 are sleeved, and the inner wall of the base 10 and the outer wall of the top cover 1 are gap-matched;

[0007] The first coil and the second coil 15 are fixed by the first left limiting component 2 , the second left limiting component 16 , the first right limiting component 5 , and the second right limiting component 9 .

[0008] Preferably, the base connecting shaft includes six identical base connecting shafts, specifically a first base connecting shaft 11, a second base connecting shaft 12, a third base connecting shaft 13, a fourth base connecting shaft 18, a fifth base connecting shaft 19 and a sixth base connecting shaft 20; the first left limit component 2, the second left limit component 16, the first right limit component 5, the second right limit component 9 are connected to the base 10 by the first base connecting shaft 11, the second base connecting shaft 12, the third base connecting shaft 13, the fourth base connecting shaft 18, the fifth base connecting shaft 19, and the sixth base connecting shaft 20.

[0009] Preferably, the groove on the bottom surface of the base 10 is transitionally matched with the first left limit component 2, the second left limit component 16, the first right limit component 5, and the second right limit component 9, so that the lower parts of the first left limit component 2, the second left limit component 16, the first right limit component 5, and the second right limit component 9 are embedded in the base 10, and the first base connecting shaft 11, the second base connecting shaft 12, the third base connecting shaft 13, the fourth base connecting shaft 18, the fifth base connecting shaft 19, and the sixth base connecting shaft 20 are cylinders, which are transitionally matched with the first left limit component 2, the second left limit component 16, the first right limit component 5, and the second right limit component 9, and one end or both ends are interference fit with the base 10.

[0010] Preferably, the component connecting shaft includes four identical component connecting shafts, specifically, a first component connecting shaft 4, a second component connecting shaft 6, a third component connecting shaft 14, and a fourth component connecting shaft 21. The first component connecting shaft 4 and the second component connecting shaft 6 are overfitted with the first left stop component 2 and the second left stop component 16; the third component connecting shaft 14 and the fourth component connecting shaft 21 are overfitted with the first right stop component 5 and the second right stop component 9.

[0011] Preferably, the electromagnetic damping nonlinear vibration isolator with a double-coil structure according to claim 1 is characterized in that the winding method of the coil is horizontal, parallel to the upper and lower sections, and the first coil 8 and the second coil 15 are connected to the wire to form a loop with other external circuits.

[0012] Preferably, the first magnetic material 7 and the second magnetic material 17 are arranged with opposite magnetic poles to form an approximately uniform magnetic field.

[0013] Preferably, the first coil 8 and the second coil 15 are electromagnetically shielded on the outer surface, that is, the side away from the central axis of the nonlinear electromagnetic vibration isolator, using a conductive tape or a ferromagnetic material.

[0014] Preferably, the stiffness structure is composed of linear and nonlinear stiffness that does not contain electromagnetics or does not generate electromagnetic coupling.

[0015] Preferably, the stiffness structure includes a first spring 3 and a second spring 22 ; the first spring 3 and the second spring 22 are fixedly connected to the base 8 , and the first spring 3 and the second spring 22 are fixedly connected to the top cover 1 .

[0016] Preferably, the base 10 is provided with a plurality of holes.

[0017] Beneficial Effects

[0018] The nonlinear electromagnetic vibration isolator of the present invention has the characteristics of nonlinear damping, adjustable damping, and functional conversion. The reliability problem of ordinary nonlinear vibration isolators under low-frequency and large-vibration working conditions is solved through the damping end, so that the vibration isolator exhibits better vibration isolation effect under low-frequency working conditions.

[0019] In the structure of the nonlinear electromagnetic vibration isolator of the present invention, the stiffness structure can adopt a simple linear stiffness structure or a variety of nonlinear stiffness structures, as long as these structures do not seriously affect the magnetic characteristics of the electromagnetic damper. The nonlinear damping structure can be connected in series and parallel with nonlinear circuits such as RLC to adjust the circuit characteristics and thus produce different damping effects. A variety of settings can be used under specific working conditions, which has the advantage of strong designability. The vibration isolator can select the nonlinear form of stiffness and damping according to the working load, and the electromagnetic damping has no friction resistance, so that the vibration isolator has more superior reliability and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the overall structure of the nonlinear electromagnetic vibration isolator of the present invention;

[0021] Figure 2 The transmissibility curves of different vibration isolators of the present invention are schematic diagrams of the base structure of the nonlinear electromagnetic vibration isolator;

[0022] Figure 3 It is a cross-sectional view of the overall structure of the nonlinear electromagnetic vibration isolator embodiment of the present invention.

[0023] The parts are numbered as follows:

[0024] Top cover 1, first left limiting component 2, first spring 3, first component connecting shaft 4, first right limiting component 5, second component connecting shaft 6, first magnetic material 7, first coil 8, second right limiting component 9, base 10, first base connecting shaft 11, second base connecting shaft 12, third base connecting shaft 13, third component connecting shaft 14, second coil 15, second left limiting component 16, second magnetic material 17, fourth base connecting shaft 18, fifth base connecting shaft 19, sixth base connecting shaft 20, fourth component connecting shaft 21, second spring 22. DETAILED DESCRIPTION

[0025] The following is combined with Figures 1 to 3 The nonlinear electromagnetic vibration isolator of the present invention is further described in detail.

[0026] like Figure 1 As shown, the nonlinear electromagnetic vibration isolator of the present invention comprises a rigid structure and a damping structure which cooperate with each other.

[0027] The present invention discloses an electromagnetic damping nonlinear vibration isolator with a double coil structure, which comprises a rigid structure and a damping structure that cooperate with each other; the damping structure comprises a top cover 1, a first left limit component 2, a first right limit component 5, a first magnetic material 7, a first coil 8, a second right limit component 9, a base 10, a second coil 15, a second left limit component 16 and a second magnetic material 17, a base connecting shaft and a component connecting shaft;

[0028] The first left limiting component 2, the second left limiting component 16, the first right limiting component 5, and the second right limiting component 9 are arranged on the base 10, and the first magnetic material 7 and the second magnetic material 17 are fixedly arranged on the top cover 1, are sleeved with the top cover 1, and are embedded in the groove of the top cover 1; the base 10 and the top cover 1 are sleeved together, and the inner wall of the base 10 and the outer wall of the top cover 1 are gap-matched; the first coil and the second coil 15 are fixed by the first left limiting component 2, the second left limiting component 16, the first right limiting component 5, and the second right limiting component 9.

[0029] The base connecting shaft includes six identical base connecting shafts, specifically a first base connecting shaft 11, a second base connecting shaft 12, a third base connecting shaft 13, a fourth base connecting shaft 18, a fifth base connecting shaft 19 and a sixth base connecting shaft 20; the first left limit component 2, the second left limit component 16, the first right limit component 5, the second right limit component 9 are connected to the base 10 by the first base connecting shaft 11, the second base connecting shaft 12, the third base connecting shaft 13, the fourth base connecting shaft 18, the fifth base connecting shaft 19, and the sixth base connecting shaft 20.

[0030] The groove on the bottom surface of the base 10 is transitionally matched with the first left limit component 2, the second left limit component 16, the first right limit component 5, and the second right limit component 9, so that the lower parts of the first left limit component 2, the second left limit component 16, the first right limit component 5, and the second right limit component 9 are embedded in the base 10, and the first base connecting shaft 11, the second base connecting shaft 12, the third base connecting shaft 13, the fourth base connecting shaft 18, the fifth base connecting shaft 19, and the sixth base connecting shaft 20 are cylinders, which are transitionally matched with the first left limit component 2, the second left limit component 16, the first right limit component 5, and the second right limit component 9, and one end or both ends are interference fit with the base 10. Preferably, the component connecting shaft includes four identical component connecting shafts, specifically the first component connecting shaft 4, the second component connecting shaft 6, the third component connecting shaft 14, and the fourth component connecting shaft 21. The first component connecting shaft 4 and the second component connecting shaft 6 are over-fitted with the first left limit component 2 and the second left limit component 16; the third component connecting shaft 14 and the fourth component connecting shaft 21 are over-fitted with the first right limit component 5 and the second right limit component 9.

[0031] The winding method of the coil is horizontal, parallel to the upper and lower sections, and the first coil 8 and the second coil 15 are connected to the wire to form a loop with other external circuits. The first magnetic material 7 and the second magnetic material 17 are arranged with opposite poles to form an approximately uniform magnetic field. The first coil 8 and the second coil 15 are electromagnetically shielded on the outer surface, that is, away from the central axis of the nonlinear electromagnetic isolator, using a conductive tape or a ferromagnetic material.

[0032] The first magnetic material 7 and the second magnetic material 17 are composed of more than one permanent magnet axially attracted and attached. When the working load or working condition of the vibration isolator needs to be changed, the size of the first magnetic material 7 and the second magnetic material 17 or the type of magnetic material can be changed to adjust the magnetic induction intensity, and the first base connecting shaft 11, the second base connecting shaft 12, the third base connecting shaft 13, the fourth base connecting shaft 18, the fifth base connecting shaft 19, the sixth base connecting shaft 20 and the first component connecting shaft 4, the second component connecting shaft 6, the third component connecting shaft 14, and the fourth component connecting shaft 21 can be removed to change the coil winding form and number of turns of the first coil 8 and the second coil 15, thereby changing the nonlinear damping size and phase characteristics of the vibration isolator to match the working conditions under different conditions. The first coil 8 and the second coil 15 can be selected in series or in parallel according to different needs, allowing external circuits with different characteristics to adjust the current, thereby realizing the regulation of damping. The top cover 1 drives the first magnetic material 7 and the second magnetic material 17 to move and cut the first coil 8 and the second coil 15 to generate current, thereby generating a nonlinear electromagnetic damping force. The damping force is related to both the speed and the displacement according to different coil winding methods, so as to achieve the purpose of low-frequency vibration isolation from the damping end. The external circuit of the first coil 8 and the second coil 15 can be added with components such as energy collection or active control, and at this time, it can be expanded to achieve the purpose of energy conversion and control.

[0033] The stiffness structure is composed of linear and nonlinear stiffness without electromagnetic or electromagnetic coupling. The stiffness structure includes a first spring 3 and a second spring 22 ; the first spring 3 and the second spring 22 are fixedly connected to the base 8 , and the first spring 3 and the second spring 22 are fixedly connected to the top cover 1 .

[0034] The base 10 has a plurality of holes, which can prevent the air compression caused by the sleeve connection between the top cover 1 and the base 10 from affecting the rigidity force and the damping force.

[0035] When the top cover 1 is subjected to a load, the load is balanced by the stiffness of the first spring 3 and the second spring 22. When the base 10 is subjected to vibration excitation, the base 10 drives the top cover 1 and the load to move in the vertical direction. The inner wall of the base exerts radial constraints on the outer wall of the top cover so that it can only slide in the axial direction, thereby ensuring the stability of the vertical movement. The structural layout of the first coil 8 and the second coil 15 can be adjusted, such as the layout of the number of turns related to the displacement, the thickness of the coil, etc. At the same time, the composition of the electronic components of the coil external circuit can be adjusted, and the magnitude and phase of the damping force can be adjusted.

[0036] It should be noted that in the nonlinear electromagnetic vibration isolator of the present invention, the first coil 8 and the second coil 15 are made of copper or other low resistivity metals, and the remaining components are made of low magnetic permeability materials except the first magnetic material 7 and the second magnetic material 17. The first magnetic material 7 and the second magnetic material 17 in the top cover 1 generate electromagnetic coupling with the first coil 8 and the second coil 15, and the variable number of turns is arranged so that the damping force is different when the excitation is small and the excitation is large, so as to achieve the effect of low-frequency vibration isolation.

[0037] Principle

[0038] In the nonlinear electromagnetic vibration isolator of the present invention, the first magnetic material 7 and the second magnetic material 17 are fixed on the top cover 1. The first coil 8 and the second coil 15 are fixed by the first left limit component 2, the second left limit component 16, the first right limit component 5, and the second right limit component 9. The groove on the bottom surface of the vibration isolator base 10 and the limit component are transitionally matched so that it is embedded in the base 10. The first spring 3 and the second spring 22 use a linear stiffness structure to provide the required stiffness force. When the top cover 1 moves, the Ampere force generated by the conductor cutting the magnetic flux lines constitutes an electromagnetic damping force, thereby achieving the effect of vibration isolation.

[0039] When the top cover 1 is subjected to the working load, the load is provided by the rigidity of the rigid structure, and the nonlinear damping force has different nonlinear characteristics under different working conditions. When the base 10 is subjected to vibration excitation, the base 10 drives the top cover 1 and the load to move in the vertical direction. The inner wall of the base 10 exerts radial constraints on the outer wall of the top cover 1 so that it can only slide in the axial direction, ensuring the stability of the vertical movement. During movement, the transmission rate curves of different vibration isolators are as follows Figure 1 As shown. The first coil 8 and the second coil 15 can be connected to different circuit elements to adjust the magnitude and phase of the current during the movement, so as to achieve the effect of variable damping under different excitations; at the same time, since the coil current can be adjusted by the loop, and the electric energy can be collected by the loop, it has the scalability of active control and energy collection.

[0040] Example

[0041] like Figure 3As shown, another working form of the nonlinear electromagnetic isolator of this embodiment includes a top cover 1, a first left limiting component 2, a first component connecting shaft 4, a first right limiting component 5, a second component connecting shaft 6, a first magnetic material 7, a first coil 8, a second right limiting component 9, a base 10, a first base connecting shaft 11, a second base connecting shaft 12, a third base connecting shaft 13, a third component connecting shaft 14, a second coil 15, a second left limiting component 16, a second magnetic material 17, a fourth base connecting shaft 18, and a fifth base. Connecting shaft 19, sixth base connecting shaft 20, fourth component connecting shaft 21, first top rotating structure 23, second top rotating structure 24, third top rotating structure 25, fourth top rotating structure 26, first bottom rotating structure 27, second bottom rotating structure 28, third bottom rotating structure 29, fourth bottom rotating structure 30, third spring 31, fourth spring 32, fifth spring 33, sixth spring 34, seventh spring 35, eighth spring 36, first rotating element shaft 37, second rotating element shaft 38.

[0042] The groove near the center of the bottom surface of the vibration isolator base 10 is transitionally matched with the first left limit part 2, the second left limit part 16, the first right limit part 5, and the second right limit part 9 so that they are embedded in the base 10. The first top rotating structure 23, the second top rotating structure 24, the third top rotating structure 25, and the fourth top rotating structure 26 are connected to the top cover 1 through the first rotating element shaft 37 and the second rotating element shaft 38, and the first bottom rotating structure 27, the second bottom rotating structure 28, the third bottom rotating structure 29, and the fourth bottom rotating structure 30 are connected to the base 10 through the third base connecting shaft 13 and the fourth base connecting shaft 18, and the rotating elements can rotate around the connection. The upper ends of the third spring 31 and the fourth spring 32 are fixed to the top cover 1, and the lower ends are fixed to the base 10.

[0043] The upper ends of the fifth spring 33, the sixth spring 34, the seventh spring 35 and the eighth spring 36 are fixed to the third top rotating structure 25, the second top rotating structure 24, the first top rotating structure 23 and the fourth top rotating structure 26, and the lower ends are fixed to the third bottom rotating structure 29, the second bottom rotating structure 28, the first bottom rotating structure 27 and the fourth bottom rotating structure 30.

[0044] The base 10 uses a linear stiffness structure to form a nonlinear three-stiffness structure model to provide nonlinear stiffness force. The stiffness structure consists of two vertically placed linear stiffness structures and four obliquely symmetrically placed linear stiffness structures. The base 10 and the top cover 1 are coaxially mounted, and the inner wall of the base and the outer wall of the top cover are gap-matched.

[0045] When the top cover 1 is subjected to a load, the load is balanced by the rigidity of the rigid structure. When the base 10 is subjected to vibration excitation, the base 10 drives the top cover 1 and the load to move in the vertical direction, and the inner wall of the base exerts radial constraints on the outer wall of the top cover so that it can only slide in the axial direction, thereby ensuring the stability of the vertical movement.

[0046] It should be noted that in the nonlinear electromagnetic vibration isolator of the present invention, the coil is made of copper or other low resistivity metals, and the remaining components except the magnetic material are made of low magnetic permeability materials. The magnetic material and the coil generate electromagnetic coupling, and the variable number of turns is arranged so that the damping force is different when the excitation is small or large, thereby achieving the effect of low-frequency vibration isolation.

[0047] The damping structure of the present invention can be used in conjunction with a variety of existing rigid structures and has a wide range of applications. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. An electromagnetic damping nonlinear vibration isolator with a double coil structure, characterized in that: The invention relates to a rigid structure and a damping structure which cooperate with each other; the damping structure comprises a top cover (1), a first left limit component (2), a first right limit component (5), a first magnetic material (7), a first coil (8), a second right limit component (9), a base (10), a second coil (15), a second left limit component (16) and a second magnetic material (17), a base connecting shaft and a component connecting shaft; The first left limiting component (2), the second left limiting component (16), the first right limiting component (5), and the second right limiting component (9) are arranged on the base (10); the first magnetic material (7) and the second magnetic material (17) are fixedly arranged on the top cover (1), are sleeved with the top cover (1), and are embedded in the groove of the top cover (1); the base (10) and the top cover (1) are sleeved together, and the inner wall of the base (10) and the outer wall of the top cover (1) are gap-matched; The first coil and the second coil (15) are fixed by a first left limiting component (2), a second left limiting component (16), a first right limiting component (5), and a second right limiting component (9).

2. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 1, characterized in that: The base connecting shaft comprises six identical base connecting shafts, specifically a first base connecting shaft (11), a second base connecting shaft (12), a third base connecting shaft (13), a fourth base connecting shaft (18), a fifth base connecting shaft (19) and a sixth base connecting shaft (20); the first left limiting component (2), the second left limiting component (16), the first right limiting component (5) and the second right limiting component (9) are connected to the base (10) by the first base connecting shaft (11), the second base connecting shaft (12), the third base connecting shaft (13), the fourth base connecting shaft (18), the fifth base connecting shaft (19) and the sixth base connecting shaft (20).

3. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 2, characterized in that: The groove on the bottom surface of the base (10) is transitionally matched with the first left limit component (2), the second left limit component (16), the first right limit component (5), and the second right limit component (9), so that the lower parts of the first left limit component (2), the second left limit component (16), the first right limit component (5), and the second right limit component (9) are embedded in the base (10); the first base connecting shaft (11), the second base connecting shaft (12), the third base connecting shaft (13), the fourth base connecting shaft (18), the fifth base connecting shaft (19), and the sixth base connecting shaft (20) are cylinders, transitionally matched with the first left limit component (2), the second left limit component (16), the first right limit component (5), and the second right limit component (9), and one end or both ends are interference matched with the base (10).

4. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 1, characterized in that: The component connecting shafts include four identical component connecting shafts, specifically a first component connecting shaft (4), a second component connecting shaft (6), a third component connecting shaft (14), and a fourth component connecting shaft (21); the first component connecting shaft (4) and the second component connecting shaft (6) are overfitted with the first left limit component (2) and the second left limit component (16); the third component connecting shaft (14) and the fourth component connecting shaft (21) are overfitted with the first right limit component (5) and the second right limit component (9).

5. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 1, characterized in that: The electromagnetic damping nonlinear vibration isolator with a double-coil structure according to claim 1 is characterized in that the winding method of the coil is horizontal and parallel to the upper and lower sections, and the first coil (8) and the second coil (15) are connected to the wire to form a loop with other external circuits.

6. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 1, characterized in that: The magnetic poles of the first magnetic material (7) and the second magnetic material (17) are arranged in opposite directions, forming an approximately uniform magnetic field.

7. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 1, characterized in that: The first coil (8) and the second coil (15) are electromagnetically shielded on the outer surface, that is, on the side away from the central axis of the nonlinear electromagnetic vibration isolator, using conductive tape or ferromagnetic material.

8. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 1, characterized in that: The stiffness structure is composed of linear and nonlinear stiffness that does not contain electromagnetics or does not generate electromagnetic coupling.

9. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 8, characterized in that: The stiffness structure comprises a first spring (3) and a second spring (22); the first spring (3) and the second spring (22) are fixedly connected to the base (8), and the first spring (3) and the second spring (22) are fixedly connected to the top cover (1).

10. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 9, characterized in that: The base (10) is provided with a plurality of holes.

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