Electromagnetic damping nonlinear vibration isolator of double-coil configuration

Abstract

The application discloses a double-coil structure electromagnetic damping nonlinear vibration isolator, which comprises a rigid structure and a damping structure 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 part, the second left limiting part, the first right limiting part and the second right limiting part are arranged on the base. The nonlinear electromagnetic vibration isolator has the characteristics of damping nonlinearity, adjustable damping and function conversion, and the reliability problem of the ordinary nonlinear vibration isolator under the working condition of low-frequency large amplitude vibration is solved through the damping end, so that the vibration isolator has a better vibration isolation effect under the low-frequency working condition.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vibration isolation, and particularly relates to an electromagnetic damping nonlinear vibration isolator with a double-coil structure. BACKGROUND

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

[0003] For the nonlinear electromagnetic vibration isolator, the source of magnetic force is mainly the permanent magnet, which generates damping through coupling with the coil. Compared with other structure types of vibration isolators, the electromagnetic damping force is a non-contact force, which has the advantage of energy conversion. In addition, active control or damping adjustment can be achieved by connecting different circuits. The nonlinear electromagnetic vibration isolator can be combined with energy collection technology and control technology to produce better vibration isolation effect and has excellent expandability. SUMMARY

[0004] The application is aimed at the problems of the prior art, and proposes an electromagnetic damping nonlinear vibration isolator with a double-coil structure. The application is implemented through the following technical scheme:

[0005] The electromagnetic damping nonlinear vibration isolator with a double-coil structure comprises a stiffness structure and a damping structure which cooperate with each other; the damping structure comprises a top cover 1, a first left limiting component 2, a first right limiting component 5, a first magnetic material 7, a first coil 8, a second right limiting component 9, a base 10, a second coil 15, a second left limiting component 16, 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 grooves in the top cover 1; the base 10 is sleeved with the top cover 1, and the inner wall of the base 10 is gap-fitted with the outer wall of the top cover 1;

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

[0008] Preferably, the base connecting shafts include 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 part 2, the second left limiting part 16, the first right limiting part 5 and the second right limiting part 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 base 10 bottom surface groove is transitionally matched with the first left limiting part 2, the second left limiting part 16, the first right limiting part 5 and the second right limiting part 9, so that the first left limiting part 2, the second left limiting part 16, the first right limiting part 5 and the second right limiting part 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 cylindrical and transitionally matched with the first left limiting part 2, the second left limiting part 16, the first right limiting part 5 and the second right limiting part 9, and one end or both ends are interference-fitted with the base 10.

[0010] Preferably, the part connecting shafts include four identical part connecting shafts, specifically, a first part connecting shaft 4, a second part connecting shaft 6, a third part connecting shaft 14 and a fourth part connecting shaft. The first part connecting shaft 4 and the second part connecting shaft 6 are transitionally matched with the first left limiting part 2 and the second left limiting part 16; the third part connecting shaft 14 and the fourth part connecting shaft are transitionally matched with the first right limiting part 5 and the second right limiting part 9.

[0011] Preferably, the electromagnetic damping nonlinear vibration isolator with a double-coil structure according to claim 1, wherein the winding mode of the coil is transverse, parallel to the upper and lower cross 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 use conductor tape or ferromagnetic materials for electromagnetic shielding on the outer surface, i.e., the side away from the central axis of the nonlinear electromagnetic vibration isolator.

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

[0015] Preferably, 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 with the base 10, and the first spring 3 and the second spring 22 are fixedly connected with the top cover 1.

[0016] Preferably, a plurality of holes are formed in the base 10.

[0017] Advantages

[0018] The nonlinear electromagnetic vibration isolator has the characteristics of damping nonlinearity, adjustable damping, and function conversion, and solves the reliability problem of ordinary nonlinear vibration isolators under low-frequency large-amplitude vibration working conditions through the damping end, so that the vibration isolator has better vibration isolation effect under low-frequency working conditions.

[0019] In the structure of the nonlinear electromagnetic vibration isolator, the stiffness structure can adopt a simple linear stiffness structure or a plurality 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 or parallel with an RLC nonlinear circuit to adjust the circuit characteristics and thus produce different damping effects. Under specific working conditions, a plurality of settings can be adopted, and the designability is strong. The vibration isolator can select the nonlinear form of stiffness and damping according to the working load, and the electromagnetic damping has no frictional resistance, so that the vibration isolator has superior reliability and applicability. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a sectional view of the overall structure of the nonlinear electromagnetic vibration isolator.

[0021] Fig. 2 It is a transmission rate curve diagram of different vibration isolators.

[0022] Fig. 3 It is a sectional view of the overall structure of the nonlinear electromagnetic vibration isolator.

[0023] The component numbers are as follows:

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

[0025] The application will be described below in detail with reference to the accompanying drawings Figs. 1 to 3 The nonlinear electromagnetic vibration isolator of the application will be described in detail below.

[0026] As Fig. 1 shown, the nonlinear electromagnetic vibration isolator of the application comprises a stiffness structure and a damping structure.

[0027] The electromagnetic damping nonlinear vibration isolator of the application comprises a stiffness structure and a damping structure; the damping structure comprises a top cover 1, a first left limiting component 2, a first right limiting component 5, a first magnetic material 7, a first coil 8, a second right limiting component 9, a base 10, a second coil 15, a second left limiting component 16, 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 in sleeve connection with the top cover 1 and are embedded in the groove of the top cover 1; the base 10 is in sleeve connection with the top cover 1, and the inner wall of the base 10 is in clearance fit with the outer wall of the top cover 1; 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 comprises six same 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 with 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 bottom surface groove of the base 10 is transitionally matched with the first left limiting part 2, the second left limiting part 16, the first right limiting part 5 and the second right limiting part 9, so that the first left limiting part 2, the second left limiting part 16, the first right limiting part 5 and the second right limiting part 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 cylindrical and transitionally matched with the first left limiting part 2, the second left limiting part 16, the first right limiting part 5 and the second right limiting part 9, and one end or both ends are interference-fitted with the base 10. Preferably, the component connecting shafts include 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. The first component connecting shaft 4 and the second component connecting shaft 6 are transitionally matched with the first left limiting part 2 and the second left limiting part 16; and the third component connecting shaft 14 and the fourth component connecting shaft are transitionally matched with the first right limiting part 5 and the second right limiting part 9.

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

[0032] The first magnetic material 7 and the second magnetic material 17 are composed of one or more permanent magnets and are axially attracted and adhered. When the working load or working condition of the vibration isolator needs to be changed, the size or type of the first magnetic material 7 and the second magnetic material 17 can be changed to adjust the magnetic induction strength, 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 can be removed, and the coil winding form and the number of turns of the first coil 8 and the second coil 15 can be changed, so as to change the nonlinear damping size and phase characteristics of the vibration isolator and match the working condition under different conditions. The first coil 8 and the second coil 15 can be selected in series or in parallel according to different needs, and different characteristic circuits can be connected to adjust the current, so as to realize the regulation and control of the damping. The first magnetic material 7 and the second magnetic material 17 are moved by the top cover 1 to 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 the speed and displacement according to different coil winding methods, so as to achieve the purpose of low-frequency vibration isolation at the damping end. The first coil 8 and the second coil 15 can be connected to a loop that can add energy collection or active control components, which can expand 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 the first spring 3 and the second spring 22; the first spring 3 and the second spring 22 are fixedly connected with the base 8, and the first spring 3 and the second spring 22 are fixedly connected with the top cover 1.

[0034] A plurality of holes are formed in the base 10. The plurality of holes formed in the base 10 can avoid the influence of air compression on the stiffness force and the damping force caused by the sleeve connection of the top cover 1 and the base 10.

[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 excited by vibration, the base 10 drives the top cover 1 and the load to move in the vertical direction, the inner wall of the base produces radial constraint to the outer wall of the top cover, so that the top cover can only slide in the axial direction, ensuring the stability of the vertical movement. The structure layout of the first coil 8 and the second coil 15 can be adjusted, such as the number of turns related to displacement, the thickness of the coil, and the like, and the electronic element composition of the coil external circuit can be adjusted to adjust the size and phase of the damping force.

[0036] It should be noted that in the nonlinear electromagnetic vibration isolator of the present application, the first coil 8 and the second coil 15 are made of copper or other low-resistivity metal, and the remaining components are made of low-permeability material 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 are electromagnetically coupled with the first coil 8 and the second coil 15, and the variable-turn arrangement makes the damping force different between small excitation and large excitation, thereby achieving the effect of low-frequency vibration isolation.

[0037] Principle description

[0038] In the nonlinear electromagnetic vibration isolator of the present application, 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 limiting component 2, the second left limiting component 16, the first right limiting component 5 and the second right limiting component 9, and the bottom surface groove of the isolator base 10 is in transition fit with the limiting components so as to be embedded in the base 10. The first spring 3 and the second spring 22 adopt linear stiffness structure to provide the required stiffness force. When the top cover 1 moves, the electromagnetic damping force is formed by the Ampere force generated by the conductor cutting the magnetic induction lines, thereby achieving the effect of vibration isolation.

[0039] When the top cover 1 is subjected to working load, the stiffness structure provides the load, 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, and the inner wall of the base 10 radially constrains the outer wall of the top cover 1 so that it can only slide in the axial direction, thereby ensuring the stability of the vertical movement. During the movement, the different isolator transmissibility curves are as shown in Fig. 2 The first coil 8 and the second coil 15 can be externally connected with different circuit elements to control the size and phase of the current during the movement, thereby achieving the effect of variable damping under different excitations. At the same time, the loop can be used to control the size of the coil current, and the loop can be used to collect electric energy, so that it has the scalability of active control and energy collection.

[0040] Embodiment

[0041] As Fig. 3As shown, another working form of the nonlinear electromagnetic vibration isolator of the 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, a fifth base connecting shaft 19, a sixth base connecting shaft 20, a fourth component connecting shaft, a first top rotary structure 23, a second top rotary structure 24, a third top rotary structure 25, a fourth top rotary structure 26, a first bottom rotary structure 27, a second bottom rotary structure 28, a third bottom rotary structure 29, a fourth bottom rotary structure 30, a third spring 31, a fourth spring 32, a fifth spring 33, a sixth spring 34, a seventh spring 35, an eighth spring 36, a first rotary element shaft 37, and a second rotary element shaft 38.

[0042] The base 10 is embedded in the base 10 through the transition fit of 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. The first top rotary structure 23, the second top rotary structure 24, the third top rotary structure 25, and the fourth top rotary structure 26 are connected to the top cover 1 through the first rotary element shaft 37 and the second rotary element shaft 38. The first bottom rotary structure 27, the second bottom rotary structure 28, the third bottom rotary structure 29, and the fourth bottom rotary structure 30 are connected to the base 10 through the third base connecting shaft 13 and the fourth base connecting shaft 18. The rotary elements can rotate around the connections. 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 rotary structure 25, the second top rotary structure 24, the first top rotary structure 23, and the fourth top rotary structure 26, and the lower ends are fixed to the third bottom rotary structure 29, the second bottom rotary structure 28, the first bottom rotary structure 27, and the fourth bottom rotary structure 30.

[0044] The base 10 adopts a linear stiffness structure to form a nonlinear three-stiffness structure model, providing nonlinear stiffness force. The stiffness structure is composed of two vertically placed linear stiffness structures and four symmetrically placed inclined linear stiffness structures. The base 10 is coaxially sleeved with the top cover 1, and the inner wall of the base is gap-fitted with the outer wall of the top cover.

[0045] When the top cover 1 is subjected to load, the load is balanced by the rigidity of the rigidity 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, the inner wall of the base produces radial constraint to the outer wall of the top cover, so that the top cover can only slide in the axial direction, and the stability of the vertical movement is ensured.

[0046] It should be noted that in the nonlinear electromagnetic vibration isolator of the present application, the coil is made of copper or other low resistivity metal, and the remaining components are made of low magnetic permeability material except the magnetic material. The magnetic material and the coil are electromagnetically coupled, and the variable number of turns arrangement makes the damping force different under small amplitude excitation and large amplitude excitation, so that the low frequency vibration isolation effect can be achieved.

[0047] The damping structure of the present application can be used with various existing rigidity structures, and has a wide range of applications. In the case of no conflict, the embodiments in the present application 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 comprises a rigidity structure and a damping structure that cooperate with each other; the damping structure comprises a top cover (1), a first left limiting component (2), a first right limiting component (5), a first magnetic material (7), a first coil (8), a second right limiting component (9), a base (10), a second coil (15), a second left limiting 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 first magnetic material (7) is located in the first coil (8), and the second magnetic material (17) is located in the second coil (15); 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 clearance-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); The coils are wound in a transverse direction, parallel to the upper and lower sections. The first coil (8) and the second coil (15) are connected to a wire to form a loop with other external circuits.

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 limiting component (2), the second left limiting component (16), the first right limiting component (5), and the second right limiting component (9), so that the lower parts of 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 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 cylindrical and transitionally matched with 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), and one end or both ends are interference-fitted 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 transitionally matched 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 transitionally matched 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 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.

6. 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 a conductive tape or ferromagnetic material.

7. 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 without electromagnetic or electromagnetic coupling.

8. The electromagnetic damping nonlinear vibration isolator with a double coil structure according to claim 7, 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 (10), and the first spring (3) and the second spring (22) are fixedly connected to the top cover (1).

9. The electromagnetic damping nonlinear vibration isolator with a double-coil structure according to claim 8, characterized in that: The base (10) is provided with a plurality of holes.

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