In-plane multi-degree-of-freedom damping device

Abstract

The application provides an in-plane multi-degree-of-freedom damping device, which comprises a vibration transmission component, a displacement amplification component and a damping component connected in sequence, wherein the vibration transmission component is provided with a vibration stroke space for transmitting multi-degree-of-freedom vibration to the displacement amplification component; the displacement amplification component is a parallelogram mechanism forming a homothetic shape, one end of a connecting rod of the parallelogram mechanism extends to form a homothetic center of the homothetic shape, the parallelogram mechanism comprises a short crank and an extension crank forming a corresponding side of the homothetic shape, and one end of the short crank corresponding to the extension end of the extension crank is arranged in the vibration stroke space; and the damping component is arranged at the extension end of the extension crank. The application has the advantages of in-plane multi-degree-of-freedom vibration suppression and effective energy dissipation for small amplitude.

Description

Technical Field

[0001] This invention relates to the field of damping, and more particularly to a multi-degree-of-freedom in-plane damping device. Background Technology

[0002] Currently, damping devices are widely used in both engineering structure vibration reduction and control and production equipment vibration suppression. The demand for micro-vibration control and multi-degree-of-freedom vibration control is increasing. However, traditional damping devices transmit vibration proportionally, and when faced with micro-amplitude vibrations, they often fail to achieve ideal vibration reduction and energy dissipation effects due to the small stroke of the damping unit. Furthermore, traditional damping devices cannot reduce vibration in a single direction and cannot control multi-degree-of-freedom micro-vibrations, which have become crucial for the vibration characteristics of production equipment and some engineering structures.

[0003] To amplify minute vibrations, Chinese invention patent 202111611105.7 discloses a viscous damper based on displacement amplification. This viscous damper utilizes the mechanical principle of linkage motion and features a displacement amplification mechanism. The connecting rod 16 forms an angle (β) of 0° to 45° with the horizontal line. The translational displacement of the transmission rod 17, transmitted to the piston guide rod 7 via the connecting rod 16, needs to be multiplied by 1 / tanβ, thus amplifying the displacement. However, this patent can only achieve single-degree-of-freedom displacement amplification and vibration control, and cannot achieve multi-degree-of-freedom displacement amplification and vibration control within a plane. Furthermore, because the displacement amplification mechanism of this patent rotates the displacement transmission direction by 90°, and components such as the cylinder are arranged perpendicular to the excitation direction, this device configuration results in uneven mass distribution. Uneven mass can easily cause stress concentration at the device connection points, affecting the damping effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an in-plane multi-degree-of-freedom damping device that has the functions of suppressing in-plane multi-freedom vibration and effectively dissipating energy for small amplitude vibrations.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] A planar multi-degree-of-freedom damping device includes a vibration transmission component, a displacement amplification component, and a damping component connected in sequence. The vibration transmission component has a vibration stroke space for transmitting multi-degree-of-freedom vibrations to the displacement amplification component. The displacement amplification component is a parallelogram mechanism forming a similar shape. One end of a link in the parallelogram mechanism extends to form the similarity center of the similar shape. The parallelogram mechanism includes a short crank and an extended crank forming a set of corresponding sides of the similar shape. The end of the short crank that is similarly located to the extended end of the extended crank is located within the vibration stroke space. The damping component is located at the extended end of the extended crank.

[0007] As a further improvement to the above technical solution:

[0008] The damping component includes an energy-dissipating magnet and a conductor plate arranged opposite to each other. The energy-dissipating magnet is installed at the extension end of the extended crank. The motion trajectory M′ of the energy-dissipating magnet and the motion trajectory M of the end of the short crank satisfy M′=kM, where k is the similarity ratio of the similarity shape formed by the parallelogram mechanism. The motion trajectory M′ of the energy-dissipating magnet is always located within the conductor plate.

[0009] The shape N′ of the conductor plate is the same as the shape N of the vibration stroke space, and satisfies N′=kN, where k is the similarity ratio of the similarity shape formed by the parallelogram mechanism.

[0010] The damping component also includes a back plate that regulates the energy-dissipating magnetic circuit. The back plate has the same shape and size as the conductor plate and is located on the side of the conductor plate away from the energy-dissipating magnet.

[0011] The energy-consuming magnet is mounted on the extended end of the extended crank via a magnet mounting plate, the shape of which is the same as the shape of the vibration stroke space.

[0012] The vibration stroke space is a vibration limiting hole, and the setting area of ​​the vibration limiting hole is larger than the in-plane vibration range of the vibration source to be damped; one end of the short crank is set in the vibration limiting hole through a hinge shaft.

[0013] The vibration transmission component includes a vibration transmission plate and a fixed plate. The vibration transmission plate is connected to the vibration source to be damped. The fixed plate is fixedly arranged parallel to the vibration transmission plate. The similarity center and the vibration stroke space are located on the fixed plate. One end of the short crank is fixed to the vibration transmission plate through a hinge shaft passing through the vibration stroke space.

[0014] The vibration plate is provided with a vibration plate limiting space to improve vibration transmission stability. The vibration plate limiting space and the vibration stroke space have the same shape and size. The hinge shaft at the approximate center passes through the fixed plate and is located within the vibration plate limiting space.

[0015] The vibration transmission component, the displacement amplification component, and the damping component are parallel to each other.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] The displacement amplification component of this invention is configured as a parallelogram mechanism. One end of a connecting rod in the parallelogram mechanism extends to form the center of a similar shape, and the short crank and extended crank of the parallelogram mechanism form a set of corresponding sides of the similar shape. This invention, through an improved configuration of the parallelogram mechanism, forms a similar shape, providing a structural basis for amplifying and reducing vibration displacement by employing a form of similarity alteration.

[0018] Meanwhile, the vibration transmission component has a vibration stroke space, the damping component is located at the extension end of the extended crank, and the end of the short crank that corresponds approximately to the extension end of the extended crank is located within the vibration stroke space. The vibration stroke space allows the in-plane multi-degree-of-freedom vibration of the vibration source to be damped to be transmitted to the vibration transmission component; at the same time, with one end of the short crank located within the vibration stroke space, the parallelogram mechanism can move within the vibration stroke space, so that the in-plane multi-degree-of-freedom vibration is amplified by the parallelogram mechanism and transmitted to the damping component; since the damping component is located at the corresponding point (the extension end of the extended crank) of the short crank at one end of the vibration stroke space, the amplified vibration displacement can be directly and effectively dissipated.

[0019] Secondly, the vibration energy of the source to be damped is directly transmitted to the damping component through the vibration stroke space of the transmission component and the parallelogram mechanism. It does not need to change the direction of force transmission, thus avoiding the low force transmission efficiency and uneven stress concentration caused by the change of force transmission direction in existing devices. This ensures reliable and effective transmission and damping of vibration energy, resulting in good damping effect and long component life.

[0020] As can be seen, the structural design of this invention is ingenious. Through the combination of parallelogram mechanism and vibration stroke space, as well as the clever use of the principle of isothetic transformation, it can amplify and effectively dissipate small amplitude vibrations while effectively suppressing multi-degree-of-freedom vibrations in a plane. This avoids the phenomenon that existing devices can only achieve single-degree-of-freedom vibration reduction and cannot effectively reduce vibrations when the vibration displacement is too small. The damping device of this invention can effectively control vibration energy under both multi-degree-of-freedom and small amplitude conditions in a plane. It is applicable to multi-degree-of-freedom small amplitude conditions in a plane, such as bridge cables and rotational excitation vibrations of mechanical equipment. Moreover, the overall structure is simple, occupies little space, and has low cost. Attached Figure Description

[0021] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0023] Figure 2 yes Figure 1 An enlarged schematic diagram of part A.

[0024] Figure 3 This is a schematic diagram of another state structure of Embodiment 1 of the present invention.

[0025] Figure 4 This is another schematic diagram of the state structure of Embodiment 1 of the present invention.

[0026] Figure 5 This is a structural schematic diagram from another perspective of Embodiment 1 of the present invention.

[0027] Figure 6 yes Figure 5 An enlarged schematic diagram of part B.

[0028] Figure 7 This is a schematic diagram of the in-plane multi-degree-of-freedom damping device of the present invention.

[0029] Figure 8 This is a schematic diagram of the structure of the present invention without the limiting space of the vibration transmission plate.

[0030] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0031] The labels in the diagram represent:

[0032] 1. Vibration transmission component; 11. Vibration stroke space; 111. Vibration limiting hole; 12. Vibration transmission plate; 121. Vibration transmission plate limiting space; 13. Fixing plate; 2. Displacement amplification component; 21. Parallelogram mechanism; 22. Homologous center; 23. Connecting rod; 24. Short crank; 25. Extended crank; 26. Hinge shaft; 3. Damping component; 31. Energy dissipating magnet; 32. Conductor plate; 33. Back plate; 34. Magnet mounting plate. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection of the present invention.

[0034] Example 1

[0035] like Figures 1 to 7As shown, the in-plane multi-degree-of-freedom damping device of this embodiment includes a vibration transmission component 1, a displacement amplification component 2, and a damping component 3 connected in sequence. The vibration transmission component 1 has a vibration stroke space 11 to transmit the in-plane multi-degree-of-freedom vibration of the source to be damped to the displacement amplification component 2. The displacement amplification component 2 is a parallelogram mechanism 21 forming a similar shape. One end of a connecting rod 23 of the parallelogram mechanism 21 extends to form a similar center 22. The parallelogram mechanism 21 includes a short crank 24 and an extended crank 25. The short crank 24 is located between the two connecting rods 23, and one end of the extended crank 25 extends out of the parallelogram mechanism 21. The short crank 24 and the extended crank 25 form a set of corresponding sides of the similar shape. The end of the short crank 24 that is similarly corresponding to the extended end of the extended crank 25 is located within the vibration stroke space 11. The damping component 3 is located at the extended end of the extended crank 25 to dissipate the vibration energy transmitted by the parallelogram mechanism 21.

[0036] The displacement amplification component 2 of this invention is configured as a parallelogram mechanism 21. The end of a connecting rod 23 of the parallelogram mechanism 21 extends to form a similarity center 22. The short crank 24 and the extended crank 25 of the parallelogram mechanism 21 form a set of corresponding sides of the similarity shape. This invention, through the improved configuration of the parallelogram mechanism 21, forms a similarity shape, providing a structural basis for amplifying and reducing vibration displacement by employing a similarity transformation.

[0037] Meanwhile, the vibration transmission component 1 is provided with a vibration stroke space 11, the damping component 3 is provided at the extension end of the extended crank 25, and the end of the short crank 24 that is similarly corresponding to the extension end of the extended crank 25 is provided within the vibration stroke space 11. The setting of the vibration stroke space 11 allows the in-plane multi-degree-of-freedom vibration of the source to be damped to be transmitted to the vibration transmission component 1; at the same time, one end of the short crank 24 is provided within the vibration stroke space 11, at this time, the parallelogram mechanism 21 can move within the vibration stroke space 11, so that the in-plane multi-degree-of-freedom vibration is amplified by the parallelogram mechanism 21 and transmitted to the damping component 3; since the damping component 3 is provided at the similarly corresponding point (the extension end of the extended crank 25) of the short crank 24 at one end of the vibration stroke space 11, the amplified vibration displacement can be directly and effectively dissipated.

[0038] Secondly, the vibration energy of the source to be damped is directly transmitted to the damping component 3 through the vibration stroke space 11 of the transmission component 1 and the parallelogram mechanism 21. It does not need to change the direction of force transmission, thus avoiding the low force transmission efficiency, uneven component distribution, and stress concentration caused by the change of the force transmission direction in existing damping devices. This ensures reliable and effective transmission and damping of vibration energy, resulting in good damping effect and long component life.

[0039] As can be seen, the structural design of this invention is ingenious. Through the combination of the parallelogram mechanism 21 and the vibration stroke space 11, as well as the ingenious use of the principle of homothetypology, it can amplify and effectively dissipate small amplitude vibrations while effectively suppressing multi-degree-of-freedom vibrations in a plane. This avoids the phenomenon that existing devices can only achieve single-degree-of-freedom vibration reduction and cannot effectively reduce vibrations when the vibration displacement is too small. The damping device of this invention can effectively control vibration energy under both multi-degree-of-freedom and small amplitude conditions in a plane. It is applicable to multi-degree-of-freedom small amplitude conditions in a plane, such as bridge cables and rotational excitation vibrations of mechanical equipment. Moreover, the overall structure is simple, occupies little space, and has low cost.

[0040] like Figure 7 As shown, the principle of the displacement amplification component 2 of this invention is a similarity transformation. The similarity center 22 of the similar shape formed by the parallelogram mechanism 21 is O, which is a fixed point on the plane. The short crank 24 and the extended crank 25 form a set of corresponding sides of the similar shape, namely BA and BA′. According to the characteristics of the similar shape, the three points O, A, and A′ are always located on a straight line when the parallelogram mechanism 21 moves. △OBA and △OB′A′ are two similar triangles, |OA′|=k|OA|, k≠0, and k is the similarity ratio (i.e., displacement amplification ratio) of the similar shape formed by the parallelogram mechanism 21. In this embodiment, the length and ratio of the connecting rod, short crank, and extended crank of the parallelogram mechanism are determined according to the value of K.

[0041] In this embodiment, the damping component 3 includes an energy-dissipating magnet 31 and a conductor plate 32 arranged opposite to each other. The energy-dissipating magnet 31 is installed at the extension end of the extended crank 25. According to the principle of the above-mentioned homothetic transformation, the motion trajectory M′ (motion range of point A′) of the energy-dissipating magnet 31 and the motion trajectory M (motion range of point A) of the end of the short crank 24 satisfy M′=kM. At this time, the motion trajectory M of the end of the short crank 24 is the in-plane multi-degree-of-motion vibration range of the vibration source to be damped, and the motion trajectory M′ of the energy-dissipating magnet 31 is k times the motion trajectory M of the end of the short crank 24. This allows the small amplitude to be effectively amplified proportionally to the damping unit, avoiding the phenomenon that the small amplitude is transmitted proportionally to the damping component 3 and cannot be effectively dissipated, thus realizing the vibration reduction and energy dissipation effect of small amplitude.

[0042] Meanwhile, the eddy current damping composed of the energy-dissipating magnet 31 and the conductor plate 32 is in a planar arrangement, which provides a structural basis for energy dissipation of multiple degrees of freedom in the plane; and the eddy current damping form has no risk of friction and leakage, forming a stable planar damping structure.

[0043] like Figures 3 to 5As shown, during vibration energy dissipation, the motion trajectory M of the end of the short crank 24 is always within the vibration stroke space 11, and the motion trajectory M′ of the energy-dissipating magnet 31 is similar to the motion trajectory M of the end of the short crank 24. The energy-dissipating magnet 31 generates relative motion with respect to the conductor plate 32, and the motion trajectory M′ of the energy-dissipating magnet 31 is always within the conductor plate 32. At this time, the conductor plate 32 cuts the magnetic field lines to generate eddy current damping force. Under the eddy current damping force, the parallelogram mechanism 21 moves slower and slower, and the angle becomes smaller and smaller until it stops, so that the vibration energy of the source to be damped is finally converted into heat energy from eddy current heating, achieving the purpose of energy dissipation and vibration reduction.

[0044] like Figure 1 and Figure 2 As shown, the vibration stroke space 11 is a vibration limiting hole 111. The area where the vibration limiting hole 111 is set is larger than the in-plane vibration range of the source to be damped. One end of the short crank 24 is set in the vibration limiting hole 111 through the hinge shaft 26. The vibration limiting hole 111 can limit the vibration transmission trajectory and the maximum stroke range. The vibration limiting hole 111 is equivalent to providing a stroke space for in-plane multi-degree-of-freedom vibration, so that the in-plane multi-degree-of-freedom vibration of the source to be damped can be completely transmitted to the parallelogram mechanism 21, realizing the effective amplification and energy dissipation of in-plane multi-degree-of-freedom vibration.

[0045] Furthermore, the shape N′ of the conductor plate 32 is the same as the shape N of the vibration stroke space 11, and satisfies N′=kN, where k is the similarity ratio of the similarity shape formed by the parallelogram mechanism 21. This ensures that the motion trajectory M′ of the energy-dissipating magnet 31 is always located within the conductor plate 32, which can save materials and reduce costs while ensuring effective energy dissipation and vibration reduction.

[0046] In this embodiment, the vibration limiting hole 111 is a circular limiting hole, and the conductor plate 32 is a circular conductor plate. The arrangement of the vibration limiting hole 111 is determined according to the vibration stroke and trajectory characteristics of the vibration source to be damped.

[0047] Furthermore, the damping component 3 also includes a back plate 33. The back plate 33 has the same shape and size as the conductor plate 32, that is, the back plate 33 is a circular back plate. The back plate 33 is located on the side of the conductor plate 32 away from the energy-dissipating magnet 31, in order to regulate the energy-dissipating magnetic circuit and improve the energy dissipation efficiency of eddy currents. In this embodiment, the back plate 33 is an iron back plate.

[0048] Furthermore, the energy-dissipating magnet 31 is mounted on the extended end of the extended crank 25 via a magnet mounting plate 34. The shape of the magnet mounting plate 34 is the same as the shape of the vibration stroke space 11, that is, the magnet mounting plate 34 is a circular mounting plate, so as to further save materials while ensuring effective energy dissipation and vibration reduction.

[0049] like Figure 1 and Figure 2As shown, the vibration transmission component 1 includes a vibration transmission plate 12 and a fixed plate 13. The vibration transmission plate 12 is connected to the source to be damped, so it vibrates together with the source. The fixed plate 13 is fixedly arranged parallel to the vibration transmission plate 12 and remains stationary during vibration energy dissipation. In this embodiment, the similarity center 22 and the vibration limiting hole 111 are both located on the fixed plate 13. One end of the short crank 24 is fixed to the vibration transmission plate 12 via a hinge shaft 26 passing through the vibration limiting hole 111.

[0050] When vibration energy is dissipated, the vibration transmission plate 12 moves relative to the fixed plate 13. The hinge shaft 26, which is connected to the vibration transmission plate 12 and located in the vibration limiting hole 111, transmits the vibration to the parallelogram mechanism 21 for amplification. The combination of the vibration transmission plate 12 and the fixed plate 13 realizes the effective transmission of in-plane multi-degree-of-freedom vibration energy, and its structure is simple and occupies little space.

[0051] like Figure 5 and Figure 6 As shown, the vibration plate 12 is provided with a vibration plate limiting space 121. The vibration plate limiting space 121 and the vibration stroke space 11 have the same shape and size, that is, both are circular holes. The hinge shaft 26, located approximately at the center 22, passes through the fixed plate 13 and is located within the vibration plate limiting space 121. The setting of the vibration plate limiting space 121 further improves the vibration transmission stability, avoids damage to the vibration transmission component 1, and ensures the reliable and effective transmission of vibration energy. In other embodiments, such as Figure 8 As shown, under the condition of ensuring stable vibration transmission, the vibration transmission plate 12 may not be provided with a vibration transmission plate limiting space 121, and the vibration transmission range may be limited only by the vibration stroke space 11 on the fixed plate 13.

[0052] In this embodiment, the vibration transmission component 1, the displacement amplification component 2, and the damping component 3 are parallel to each other to ensure the reliable and effective transmission of in-plane multi-degree-of-freedom vibration energy.

[0053] Example 2

[0054] Figure 9 Another embodiment of the in-plane multi-degree-of-freedom damping device of the present invention is shown. This embodiment is basically the same as the previous embodiment, except that the vibration limiting hole 111 in this embodiment is a square vibration limiting hole. The setting form of the vibration limiting hole 111 is determined according to the vibration stroke and trajectory characteristics of the source to be damped. It is necessary to ensure that the setting area of ​​the vibration limiting hole 111 is larger than the in-plane vibration range of the source to be damped.

[0055] In this embodiment, the conductor plate 32, the back plate 33, and the magnet mounting plate 34 are all designed with a square structure, and the shape of the square structure is the same as the shape of the square vibration limiting hole. In other embodiments, the vibration limiting hole 111 can also be designed as a triangle, an arc, or other shapes.

[0056] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multi-degree-of-freedom damping device in a plane, characterized in that, The device includes a vibration transmission component, a displacement amplification component, and a damping component connected in sequence. The vibration transmission component has a vibration stroke space for transmitting multi-degree-of-freedom vibrations to the displacement amplification component. The displacement amplification component is a parallelogram mechanism forming a similar shape. One end of a link in the parallelogram mechanism extends to form the similarity center of the similar shape. The parallelogram mechanism includes a short crank and an extended crank forming a set of corresponding sides of the similar shape. The end of the short crank that is similarly located to the extended end of the extended crank is located within the vibration stroke space. The damping component is located at the extended end of the extended crank. The vibration stroke space is a vibration limiting hole, and the area of ​​the vibration limiting hole is larger than the in-plane vibration range of the vibration source to be damped. One end of the short crank is located within the vibration limiting hole via a hinge shaft.

2. The in-plane multi-degree-of-freedom damping device according to claim 1, characterized in that, The damping component includes an energy-dissipating magnet and a conductor plate arranged opposite to each other. The energy-dissipating magnet is installed at the extended end of the extended crank. The motion trajectory M′ of the energy-dissipating magnet and the motion trajectory M of the end of the short crank satisfy M′=kM, where k is the similarity ratio of the similarity shape formed by the parallelogram mechanism. The motion trajectory M′ of the energy-dissipating magnet is always located within the conductor plate.

3. The in-plane multi-degree-of-freedom damping device according to claim 2, characterized in that, The shape N′ of the conductor plate is the same as the shape N of the vibration stroke space, and satisfies N′=kN, where k is the similarity ratio of the similarity shape formed by the parallelogram mechanism.

4. The in-plane multi-degree-of-freedom damping device according to claim 3, characterized in that, The damping component also includes a back plate that regulates the energy-dissipating magnetic circuit. The back plate has the same shape and size as the conductor plate and is located on the side of the conductor plate away from the energy-dissipating magnet.

5. The in-plane multi-degree-of-freedom damping device according to claim 2, characterized in that, The energy-consuming magnet is mounted on the extended end of the extended crank via a magnet mounting plate, the shape of which is the same as the shape of the vibration stroke space.

6. The in-plane multi-degree-of-freedom damping device according to any one of claims 1 to 5, characterized in that, The vibration transmission component includes a vibration transmission plate and a fixed plate. The vibration transmission plate is connected to the vibration source to be damped. The fixed plate is fixedly arranged parallel to the vibration transmission plate. The similarity center and the vibration stroke space are located on the fixed plate. One end of the short crank is fixed to the vibration transmission plate through a hinge shaft passing through the vibration stroke space.

7. The in-plane multi-degree-of-freedom damping device according to claim 6, characterized in that, The vibration plate is provided with a vibration plate limiting space to improve vibration transmission stability. The vibration plate limiting space and the vibration stroke space have the same shape and size. The hinge shaft at the approximate center passes through the fixed plate and is located within the vibration plate limiting space.

8. The in-plane multi-degree-of-freedom damping device according to any one of claims 1 to 5, characterized in that, The vibration transmission component, the displacement amplification component, and the damping component are parallel to each other.

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