A damping characteristic design method and energy-dissipating amplification torque eddy current damper

Abstract

The invention discloses a damping characteristic design method and an energy-dissipating and amplifying torque eddy current damper. The damping characteristic design method comprises obtaining a damping coefficient according to the physical characteristics of a rotating part, the measured moment of inertia, the initial rotation speed, the maximum rotation speed of the rotating part, the minimum rotation speed, the angle through which the rotating part needs to rotate, the lower limit and the upper limit of the load received during the rotation process, and designing a motion amplifying gear assembly in combination with the installation space reserved for the eddy current damper in actual use; the energy-dissipating and amplifying torque eddy current damper comprises a damping generating assembly and a motion amplifying gear assembly. When the rotating part undergoes a relative rotational motion around a rotating shaft, the conductor plate of the damping generating assembly continuously cuts the magnetic part to generate an eddy current damping force. The motion amplifying gear assembly can amplify the output damping force exponentially under the limitation of a relatively small installation space, thereby greatly improving the equipment control tonnage of the damper.

Description

Technical Field

[0001] The invention relates to the field of industrial equipment, and in particular to a damping characteristic design method and an energy-dissipating amplifying torque eddy current damper. Background Art

[0002] During the use of industrial rotating equipment, its components will rotate or swing under the action of external loads. It is necessary to use efficient buffer devices to control the rotation speed to avoid the impact fracture of component connections caused by excessive rotation speed. The external loads on industrial rotating equipment fluctuate in a large range according to the different working conditions, resulting in the distribution of rotation rates in different intervals.

[0003] The damping force of the commonly used displacement dampers is often a fixed value, which cannot change with the change of relative motion speed and cannot adapt to the variable characteristics of its external load, which often affects the normal service of industrial equipment; and the existing velocity dampers are mostly viscous fluid dampers. Under long-term continuous load and rotation conditions, the damping coefficient of the viscous fluid damper decreases with the increase of speed. Under long-term continuous load conditions, leakage is prone to occur due to friction loss and aging of seals; the existing damping characteristic design method often requires complex calculations, and the damping characteristic parameters are difficult to obtain, which is not convenient for rapid design of damping parameters at the construction site. In addition, the existing dampers are limited by volume and are not convenient for use in a small installation space, which limits the application scope of the damper. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art of complex damping characteristic design, large damper size, inconvenience in using in a small space, inability to adapt to variable external loads, and easy leakage, and to provide a damping characteristic design method and an eddy current damper using the method.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] A damping characteristic design method, wherein the damping system comprises a rotating member and an energy-dissipating and amplifying torque eddy current damper, wherein the rotating member rotates around a rotating shaft, the eddy current damper is installed between the rotating member and the rotating shaft, and the eddy current damper can reduce the relative rotation between the rotating member and the rotating shaft, and comprises the following steps:

[0007] S1. According to the physical characteristics of the rotating part, the moment of inertia I of the rotating part and the maximum speed ω that the rotating part can withstand during the rotation process are measured. max 、Minimum speed ω min ; According to the actual use requirements, determine the angle θ that the rotating part needs to rotate; determine the lower limit M of the load that the rotating part is subjected to during the rotation process Lmin and load limit MLmax , M Lmin =h min θ, M Lmax =h max ·θ,h min 、h max is a constant;

[0008] S2. Determine the damping coefficient c of the eddy current damper according to the following formula;

[0009]

[0010] S3. Design the damping generating assembly and motion amplifying gear assembly of the eddy current damper, wherein the damping coefficient of the damping generating assembly is c 0 , the amplification factor of the motion amplification gear assembly is k, c 0 ×k 2 = c, and adjust c in the simulation software according to the installation space reserved for the eddy current damper in actual use. 0 , the values ​​of k and the placement of the damping generating assembly and the motion amplifying gear assembly enable the eddy current damper to be installed in the installation space.

[0011] By using the damping characteristic design method proposed in the present invention, all the required parameters can be obtained through measurement. The parameters are easy to obtain. The damping coefficient of the eddy current damper can be quickly determined through simple calculations. In the actual construction process, the specific scheme and parameters of vibration control and buffering can be quickly determined according to the working conditions, which is convenient for rapid engineering application. The motion amplification gear assembly can be set to multiply the output damping force under the limitation of a small installation space, so that the control tonnage of the equipment of the present patent is greatly improved. By adjusting c through simulation software 0 , the values ​​of k and the placement of the damping generating assembly and the motion amplifying gear assembly enable the eddy current damper to match the installation space.

[0012] Preferably, the damping coefficient c in S2 adopts an intermediate value, that is, the average value of the upper and lower limits of the design formula.

[0013] An energy-dissipating and amplifying torque eddy current damper is designed using the damping characteristic design method provided in the present invention, and includes a damping generating component and a motion amplifying gear component. The damping generating component includes a bracket and a back iron. The bracket is sleeved on the rotating shaft. The bracket is provided with a permanent magnet. The back iron is connected to the rotating part through a connecting plate. The back iron is provided with a conductor plate. The two ends of the motion amplifying gear component are respectively connected to the bracket and the back iron.

[0014] The energy-dissipating and amplifying torque eddy current damper described in the present invention adopts eddy current damping technology. When the rotating part performs relative rotational motion around the rotating shaft, the conductor plate continuously cuts the changing magnetic field excited by the rotation of the magnetic part, thereby generating eddy current damping force. The eddy current damping force serves as resistance to the relative rotation of the rotating shaft and the rotating part, reducing the relative rotation between the rotating shaft and the rotating part. The motion amplifying gear assembly can multiply the output damping force within the limitation of a smaller installation space, thereby greatly improving the equipment control tonnage of the damper. The damping generating assembly of the damper is made of a purely mechanical structure, does not contain liquid inside, and does not have the problem of leakage.

[0015] Preferably, the motion amplifying gear assembly includes a driving shaft gear and a driven gear set, the driving shaft gear is fixedly connected to the rotating shaft, the driving shaft gear is meshed with the driven gear set, the driven gear set is fixedly connected to the back iron, and the driven gear set is meshed with the bracket gear of the bracket.

[0016] When the rotating part undergoes relative rotational motion around the rotating shaft, the driving shaft gear of the eddy current damper amplifies the relative rotational motion once through the driven gear set, and the driven gear set amplifies the amplified relative rotational motion again through the bracket gear, thereby amplifying the input speed, increasing the output damping force of the damper, and improving the usability of the damper in a narrow space. The driven gear set meshes with the bracket gear of the bracket, and since the bracket gear rotates integrally with the bracket, the rotational motion of the external input can be transmitted through the bracket gear to drive the bracket to rotate.

[0017] Preferably, the driven gear set comprises a driven gear rotating shaft, on which a small gear and a large gear are coaxially provided, the small gear meshes with the driving shaft gear, and the large gear meshes with the bracket gear.

[0018] Preferably, the diameter of the driving shaft gear is larger than the diameter of the pinion gear, and the pinion gear and the large gear gear have the same rotational speed.

[0019] A large and a small gear are arranged in the driven gear set, and the diameter of the driving shaft gear is larger than that of the small gear. The small gear and the large gear have the same rotation speed. The small gear meshes with the driving shaft gear, and the large gear meshes with the bracket gear to realize a two-stage amplification of the external input speed.

[0020] Preferably, the bracket is rotatably connected to the back iron via a bearing.

[0021] Preferably, the conductor plate and the bracket are coaxially arranged.

[0022] With this arrangement, the bracket is connected to the back iron through a bearing, and the conductor plate and the bracket are coaxially arranged. The back iron can drive the conductor plate to make circular motion in the direction opposite to the bracket, and the conductor plate continuously cuts the rotation of the magnetic part, thereby generating eddy current damping force.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Using the damping characteristic design method proposed in the present invention, most of the required parameters can be obtained through measurement. The parameters are easy to obtain. The damping coefficient of the eddy current damper can be determined by simple calculation. In the actual construction process, the specific scheme and parameters of vibration control and buffering can be quickly determined according to the working conditions, which is convenient for rapid engineering application. The use of motion amplification gear components can multiply the output damping force under the limitation of a small installation space, greatly improving the control tonnage of the equipment of this patent. Adjusting c by simulation software 0 The value of k and the placement of the damping generating assembly and the motion amplifying gear assembly make the eddy current damper match the installation space.

[0025] 2. The eddy current damper described in the present invention adopts eddy current damping technology. When the rotating part performs relative rotational motion around the rotating shaft, the conductor plate continuously cuts the changing magnetic field excited by the rotation of the magnetic part, thereby generating eddy current damping force. The eddy current damping force serves as a resistance to the relative rotation of the rotating shaft and the rotating part, reducing the relative rotation between the rotating shaft and the rotating part. The eddy current damper can output a suitable damping force to adapt to the rotation speed, so that it can be maintained within a certain rotation speed range under the working conditions; the motion amplification gear assembly can multiply the output damping force under the limitation of a small installation space, so that the equipment control tonnage of the damper is greatly improved; the damping generating assembly of the damper is made of a purely mechanical structure, and does not contain liquid inside, so there is no leakage problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of the damping characteristic design method provided by the present invention;

[0027] Figure 2 is a schematic diagram of the relative position of the eddy current damper and the rotating part;

[0028] Figure 3 yes Figure 2 Cross-sectional view in the middle TT direction;

[0029] Figure 4 is a cross-sectional view of an eddy current damper;

[0030] Numbers in the figure: 1-eddy current damper, 11-bearing, 12-driving shaft gear, 13-driven gear set, 131-small gear, 132-large gear, 133-driven gear shaft, 14-bracket gear, 15-bracket, 16-permanent magnet, 17-conductor plate, 18-back iron, 19-connecting plate, 2-rotating part, 3-rotating shaft. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, a damping characteristic design method is provided, wherein the damping system comprises a rotating member 2 and an energy-dissipating torque-amplifying eddy current damper 1, wherein the rotating member 2 rotates around a rotating shaft 3, and the eddy current damper 1 is installed between the rotating member 2 and the rotating shaft 3, and the eddy current damper 1 can reduce the relative rotation between the rotating member 2 and the rotating shaft 3, and the design method comprises the following steps:

[0035] S1. According to the physical characteristics of the rotating member 2, the moment of inertia I of the rotating member 2 and the maximum speed ω that the rotating member 2 can withstand during the rotation process are measured. max 、Minimum speed ω min ; According to the actual use requirements, determine the angle θ that the rotating member 2 needs to rotate; determine the lower limit M of the load that the rotating member 2 is subjected to during the rotation process Lmin and load limit M Lmax , M Lmin =h min θ, M Lmax =h max ·θ,h min 、h max is a constant;

[0036] S2. Determine the damping coefficient c of the eddy current damper 1 according to the following formula;

[0037]

[0038] S3. Design the damping generating assembly and motion amplifying gear assembly of the eddy current damper 1, wherein the damping coefficient of the damping generating assembly is c 0 , the amplification factor of the motion amplification gear assembly is k, c 0 ×k 2= c, and adjust c in the simulation software according to the installation space reserved for the eddy current damper 1 in actual use. 0 , the values ​​of k and the placement of the damping generating assembly and the motion amplifying gear assembly enable the eddy current damper 1 to be installed in the installation space.

[0039] Take a specific example: for a rotating part 2, its moment of inertia I is 3kg·m 2 , initial velocity ω 0 is 0 rad / s, the angle θ that the rotating part 2 needs to rotate e =π / 2, the lower limit of the load M on the rotating member 2 during the rotation process Lmin =h min ·θ=200·θ(N·m), load upper limit M Lmax =h max ·θ=500·θ(N·m), the maximum speed ω that the rotating part 2 can withstand during the rotation process max is 10rad / s, minimum speed ω min is 4rad / s.

[0040] According to the formula in step S2, the value range of the damping coefficient c is 59.44 N·m·s / rad≤c≤70.90 N·m·s / rad. It is recommended to take an intermediate value, that is, the damping coefficient c=65.17 N·m·s / rad.

[0041] After the fourth-order Runge-Kutta method was used to iteratively solve the time, under the maximum load, if the damper is not set, the final velocity of the rotating part 2 is 20.33 rad / s, if the damper is set, the final velocity of the rotating part 2 is 9.403 rad / s, and the final kinetic energy of the rotating part 2 is reduced by 78.6%. After vibration reduction and buffering, the final velocity requirement is met and the effect is obvious; under the minimum load, if the damper is not set, the final velocity of the swing (rotating) part 2 is 12.85 rad / s, if the damper is set, the final velocity of the swing (rotating) part 2 is 4.284 rad / s, and the final kinetic energy of the swing (rotating) part 2 is reduced by 88.9%. After vibration reduction and buffering, the final velocity requirement is met and the effect is obvious.

[0042] Example 2

[0043] like Figure 2-4 As shown, an energy-dissipating torque-amplifying eddy current damper 1 designed using the damping characteristic design method of the present invention includes a damping generating component and a motion-amplifying gear component. The rotating shaft 3 passes through the eddy current damper 1 and the rotating member 2 at the same time, and the rotating member 2 can rotate or swing freely around the rotating shaft 3.

[0044] The damping generating component includes a bracket 15, on which a permanent magnet 16 is fixed, and the bracket 15 is rotatably connected to a back iron 18 via a bearing 11, on which a conductor plate 17 is fixed, and the conductor plate 17 is coaxially arranged with the bracket 15, and the permanent magnet 16 is located between the conductor plate 17 and the bracket 15, and the back iron 18 is fixed to a rotating part 2 to be controlled via a connecting plate 19, and the conductor plate 17 has a relatively high electrical conductivity and is used to generate eddy currents, thereby generating a damping force, and the connecting plate 19 is used to fixedly connect the back iron 18 and the rotating part 2, and the back iron 18 is used to fix the conductor plate 17 and form a closed magnetic circuit.

[0045] The motion amplifying gear assembly includes a driving shaft gear 12, the rotating shaft 3 passes through the driving shaft gear 12 and is fixedly connected to the driving shaft gear 12, the driving shaft gear 12 is meshed with a pinion 131 of a driven gear set 13, the diameter of the driving shaft gear 12 is larger than the diameter of the pinion 131, the driven gear set 13 also includes a large gear 132, the diameter of the large gear 132 is larger than the diameter of the pinion 131, the pinion 131 and the large gear 132 rotate as a whole, and the two have the same rotation speed. The large gear 132 is meshed with the bracket gear 14, and the bracket gear 14 is fixedly connected to the bracket 15, driving the bracket 15 and the permanent magnet 16 fixed thereon to rotate together. The driven gear set 13 is fixedly connected to the back iron 18 and rotates together with the back iron 18. The rotating shaft 3 passes through the bracket gear 14, and the two can rotate freely relative to each other. The bracket gear 14 is used to drive the bracket 15 and the permanent magnet 16 fixed above it to rotate around the rotating shaft 3. The rotating shaft 3 is used to fix the driving shaft gear 12 and allow the rotating member 2 and the permanent magnet bracket gear 14 to rotate freely around their central axis. The driven gear set 13 is used to connect the driving shaft gear 12 and the bracket gear 14, and amplify the relative rotation between the two twice, namely: ① the driving shaft gear 12 is meshed with the small gear 131 of the driven gear set 13; ② the large gear 132 of the driven gear set 13 is meshed with the bracket gear 14.

[0046] Example 3

[0047] When using the eddy current damper of the present invention, the installation of the eddy current damper 1 and the rotating member 2 can be performed in the following order:

[0048] 1. Determine the available space between the rotating shaft 3, the rotating member 2, and the rotating member 2 and the rotating shaft 3;

[0049] 2. According to the damping characteristic design method of the present invention, the damping characteristics required for the rotational motion control of the rotating member 2 are determined;

[0050] 3. Design the eddy current damper 1 according to the required damping characteristics and the available space between the rotating member 2 and the rotating shaft 3;

[0051] 4. Insert the rotating shaft 3 into one side of the rotating member 2;

[0052] 5. Insert the rotating shaft 3 into the inner holes of the driving shaft gear 12, the bracket gear 14 and the bracket 15 of the eddy current damper 1;

[0053] 6. Insert the rotating shaft 3 completely into the rotating member 2;

[0054] 7. Lock the rotational motion between the rotating shaft 3 and the driving shaft gear 12;

[0055] 8. Fix the back iron 18 and the rotating part 2.

[0056] When the rotating member 2 undergoes relative rotational motion around the rotating shaft 3:

[0057] The eddy current damper 1 rotates with the rotating member 2, the driving shaft gear 12 of the eddy current damper 1 is fixed to the rotating shaft 3 and remains stationary, and the pinion 131 of the driven gear set 13 rotates on its rotating shaft as the eddy current damper 1 swings. At this time, the relative rotation motion is amplified once by the meshing of the pinion 131 of the driven gear set 13 and the driving shaft gear 12;

[0058] The large gear 132 of the driven gear set 13 rotates at the same speed as the small gear 131. The amplified relative rotational motion is amplified again through the meshing of the bracket gear 14 and the large gear 132 of the driven gear set 13.

[0059] The bracket gear 14 is fixedly connected to the bracket 15 and rotates as a whole, driving the permanent magnet 16 on the bracket 15 to rotate, and the permanent magnet 16 on the bracket 15 rotates relative to the conductor plate 17 and the back iron 18.

[0060] During this relative rotation, the conductor plate 17 continuously cuts the changing magnetic field excited by the rotation of the permanent magnet 16, thereby generating eddy current damping force, which acts as resistance to the relative rotation of the shaft 3 and the rotating member 2, reducing the relative rotation between the shaft 3 and the rotating member 2.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A damping characteristic design method, characterized in that: The damping system comprises a rotating member (2) and an energy-dissipating torque-amplifying eddy current damper (1), wherein the rotating member (2) rotates around a rotating shaft (3), the eddy current damper (1) is installed between the rotating member (2) and the rotating shaft (3), and the eddy current damper (1) can reduce the relative rotation between the rotating member (2) and the rotating shaft (3). The design method comprises the following steps: S1. According to the physical characteristics of the rotating member (2), the moment of inertia I of the rotating member (2) and the maximum rotation speed ω that the rotating member (2) can withstand during the rotation process are measured. max 、Minimum speed ω min ; According to actual use requirements, determine the angle θ that the rotating member (2) needs to rotate; determine the lower limit M of the load to which the rotating member (2) is subjected during the rotation process Lmin and load limit M Lmax , M Lmin =h min θ, M Lmax =h max ·θ,h min 、h max is a constant; S2. Determine the damping coefficient c of the eddy current damper (1) according to the following formula; S3. Design the damping generating component and the motion amplifying gear component of the eddy current damper (1), wherein the damping coefficient of the damping generating component is c0, and the amplification coefficient of the motion amplifying gear component is k, c0×k 2 = c, and in combination with the installation space reserved for the eddy current damper (1) during actual use, the values ​​of c0 and k as well as the placement positions of the damping generating component and the motion amplifying gear component are adjusted in the simulation software so that the eddy current damper (1) can be installed in the installation space.

2. A damping characteristic design method according to claim 1, characterized in that: The damping coefficient c in S2 adopts an intermediate value.

3. An energy-dissipating and amplifying torque eddy current damper, characterized in that: The design is carried out using the damping characteristic design method as described in any one of claims 1 to 2, including a damping generating component and a motion amplifying gear component, wherein the damping generating component includes a bracket (15) and a back iron (18), wherein the bracket (15) is sleeved on the rotating shaft (3), wherein the bracket (15) is provided with a permanent magnet (16), wherein the back iron (18) is connected to the rotating member (2) via a connecting plate (19), wherein the back iron (18) is provided with a conductor plate (17), and wherein the two ends of the motion amplifying gear component are respectively connected to the bracket (15) and the back iron (18).

4. The energy dissipation amplification torque eddy current damper according to claim 3, characterized in that: The motion amplifying gear assembly comprises a driving shaft gear (12) and a driven gear set (13), wherein the driving shaft gear (12) is fixedly connected to the rotating shaft (3), the driving shaft gear (12) is meshed with the driven gear set (13), the driven gear set (13) is fixedly connected to the back iron (18), and the driven gear set (13) is meshed with the bracket gear (14) of the bracket (15).

5. The energy dissipation amplification torque eddy current damper according to claim 4, characterized in that: The driven gear set (13) comprises a driven gear rotating shaft (133), on which a small gear (131) and a large gear (132) are coaxially arranged, the small gear (131) meshing with the driving shaft gear (12), and the large gear (132) meshing with the bracket gear (14).

6. The energy dissipation amplification torque eddy current damper according to claim 5, characterized in that: The diameter of the driving shaft gear (12) is greater than the diameter of the small gear (131), and the small gear (131) and the large gear (132) have the same rotation speed.

7. The energy dissipation amplification torque eddy current damper according to claim 3, characterized in that: The bracket (15) is rotatably connected to the back iron (18) via a bearing (11).

8. The energy dissipation amplification torque eddy current damper according to claim 3, characterized in that: The conductor plate (17) and the bracket (15) are coaxially arranged.

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