Dynamic vibration absorber

Abstract

The dynamic vibration absorber (7) comprises a first support portion (8), a second support portion (9) spaced apart from the first support portion by a first gap, and at least a first vibration absorber module (10), the first vibration absorber module (10) comprises a first surface (8a) of the first support portion, a first surface (9a) of the second support portion, and a first vibration absorber cylinder (13) connecting the first surface of the first support portion and the first surface of the second support portion, the first vibration absorber cylinder comprising a first cylindrical portion (13a) and at least a first movable mass (13c), the first movable mass is connected to the first cylindrical portion and configured to vibrate at a predetermined frequency.

Description

Technical Field

[0001] The invention relates to a dynamic vibration absorber.

[0002] The present invention more particularly relates to a dynamic vibration absorber for a rotating electrical machine, such as a motor or a generator. Background Art

[0003] Dynamic vibration absorbers have been widely used to reduce the vibration of machines. This is a component consisting of a spring and a mass whose characteristic frequency is the same as the frequency of the vibration in question, and which reduces the vibration in question by using the inertial force of the mass and the vibration in phase opposite to the vibration in question.

[0004] Here, the following relationship is satisfied:

[0005]

[0006] Here, f represents the characteristic frequency (natural frequency), K represents the spring stiffness, and M represents the mass.

[0007] A commonly used dynamic vibration absorber vibrates in a phase opposite to that of the input vibration at a characteristic frequency f determined by the ratio between the movable mass M and the spring stiffness K, and reduces the vibration using the inertial force of the mass M. Therefore, it is necessary to use one dynamic vibration absorber for the one frequency in question.

[0008] Furthermore, one such dynamic vibration absorber can absorb vibrations in only one direction. Therefore, for example, absorbing rotational vibrations also requires the use of another dynamic vibration absorber that absorbs vibrations in a direction perpendicular to the first direction, thus requiring a wider installation space. In order to absorb vertical vibrations in addition to rotational vibrations, another absorber must be used specifically for vertical vibrations, which requires further increase in installation space.

[0009] Document EP 0204330 discloses a dynamic vibration absorber of compact design which is able to absorb multidirectional vibrations of a structure.

[0010] However, such dynamic vibration absorbers are complex to manufacture and tune. Summary of the invention

[0011] It is therefore proposed to remedy at least one of the disadvantages associated with the dynamic vibration absorbers known from the prior art.

[0012] In view of the above situation, the present invention proposes a dynamic vibration absorber.

[0013] The dynamic vibration absorber includes a first support portion, a second support portion separated from the first support portion by a first gap, and at least one first vibration absorber module, the first vibration absorber module includes a first surface of the first support portion, a first surface of the second support portion, and a first vibration absorber cylinder connecting the first surface of the first support portion and the first surface of the second support portion, the first vibration absorber cylinder includes a first cylindrical portion and at least a first movable mass, the first movable mass is connected to the first cylindrical portion and is configured to vibrate at a predetermined frequency.

[0014] Preferably, the first vibration absorber cylinder includes a second cylindrical portion, the first movable mass is inserted between the first cylindrical portion and the second cylindrical portion, the first movable mass is also connected to the second cylindrical portion and is configured to vibrate at a predetermined frequency between the first and second cylindrical portions.

[0015] Advantageously, the first and second cylindrical portions are made of a second material, and the first movable mass is made of a first material, the elastic modulus of the second material being smaller than the elastic modulus of the first material, in particular, the elastic modulus of the second material being ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material being one hundred times smaller than the elastic modulus of the first material.

[0016] Preferably, the dynamic vibration absorber further comprises an additional mass fixed on either side of the side portion of the first movable mass, the additional mass not being in contact with the first and second cylindrical portions.

[0017] Advantageously, the dynamic vibration absorber further comprises a first damping layer inserted between the first cylindrical part and the first movable mass, and a second damping layer inserted between the second cylindrical part and the first movable mass, the first movable mass being connected to the first cylindrical part via the first damping layer, and the first movable mass being connected to the second cylindrical part via the second damping layer.

[0018] Preferably, the first cylindrical part, the second cylindrical part and the first movable mass are made of a first material, and the first damping layer and the second damping layer are made of a second material, the elastic modulus of the second material is smaller than the elastic modulus of the first material, in particular, the elastic modulus of the second material is ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material is one hundred times smaller than the elastic modulus of the first material.

[0019] Advantageously, the first movable mass is inserted between the first cylindrical portion and the second cylindrical portion in a gap-like manner so that the first movable mass does not contact the first and second cylindrical portions, and the first vibration absorber cylinder further comprises a first group of connecting elements and a second group of connecting elements, each connecting element in the first group of connecting elements connecting the first movable mass to the first cylindrical portion, and each connecting element in the second group of connecting elements connecting the first movable mass to the second cylindrical portion, so that the first movable mass is connected to the first cylindrical portion and the second cylindrical portion via the first group and the second group of connecting elements.

[0020] Preferably, the first movable mass includes a first surface, a second surface opposite to the first surface, a third surface and a fourth surface opposite to the third surface, each connecting element in the first group of connecting elements connects the movable mass and the first surface, each connecting element in the second group of connecting elements is connected to the movable mass and the second surface, the first dynamic vibration cylinder also includes a third group of connecting elements and a fourth group of connecting elements, each connecting element in the third group of connecting elements connects the third surface of the first movable mass and the first cylindrical part or the second cylindrical part, and each connecting element in the fourth group of connecting elements connects the fourth surface of the first movable mass and the first cylindrical part or the second cylindrical part.

[0021] Advantageously, the first cylindrical portion and the second cylindrical portion comprise threaded holes and screws, each screw being engaged in the threaded hole, a first end of each connecting element of the third and fourth groups being supported by the screw, and a second end of the connecting element being inserted into the first movable mass.

[0022] Preferably, each connecting element is made of a second material, the first movable mass is made of a first material, and the first cylindrical part and the second cylindrical part are made of a third material, the elastic modulus of the second material is equal to or greater than or less than the elastic modulus of the first material, for example, the elastic modulus of the second material is ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material is one hundred times smaller than the elastic modulus of the first material, and the density of the first material is greater than the density of the third material.

[0023] Advantageously, each connecting element comprises a spring.

[0024] Preferably, the first cylindrical part includes a recess extending according to the central axis of the first vibration absorber cylinder body and a group of rods protruding from the first cylindrical part and extending in the recess of the first cylindrical part, the first movable mass includes a group of through holes, each rod in the group of the first cylindrical part is inserted into a through hole in the group of through holes of the first movable mass, and the first movable mass is connected to the first cylindrical part through the rods in the group of rods of the first cylindrical part.

[0025] Advantageously, the first cylindrical portion includes a recess extending along the central axis of the first vibration absorber cylinder and at least two rods protruding from the first cylindrical portion and extending in the recess of the first cylindrical portion, the first movable mass includes a through hole, the first rod of the first cylindrical portion is inserted into the through hole of the first movable mass, the first vibration absorber cylinder also includes a second movable mass including a through hole, the second rod of the first cylindrical portion is inserted into the through hole of the second movable mass, and the second movable mass is configured to vibrate at a predetermined frequency.

[0026] Preferably, the first vibration absorber cylinder includes a second cylindrical part, the second cylindrical part includes a recess extending along the central axis of the first vibration absorber cylinder and a group of rods protruding from the second cylindrical part and extending in the recess of the second cylindrical part, the first vibration absorber cylinder also includes a movable mass, the movable mass includes a group of through holes, each rod in the group of the second cylindrical part is inserted into a through hole in the group of through holes of the movable mass, the movable mass is connected to the second cylindrical part via the rods in the group of rods of the second cylindrical part, and the movable mass is configured to vibrate at a predetermined frequency.

[0027] Advantageously, the dynamic vibration also includes a second vibration absorber module, which includes a second surface of the first support part, a second surface of the second support part, and a second vibration absorber cylinder connecting the second surface of the first support part and the second surface of the second support part, the second vibration absorber cylinder including a first cylindrical part and at least a first movable mass, the first movable mass of the second vibration absorber cylinder being connected to the first cylindrical part of the second vibration absorber cylinder and being configured to vibrate at a predetermined frequency.

[0028] Technical Solution 1. A dynamic vibration absorber, characterized in that the dynamic vibration absorber includes a first supporting part, a second supporting part separated from the first supporting part by a first gap, and at least a first vibration absorber module, the first vibration absorber module includes a first surface of the first supporting part, a first surface of the second supporting part, and a first vibration absorber cylinder connecting the first surface of the first supporting part and the first surface of the second supporting part, the first vibration absorber cylinder includes a first cylindrical part and at least a first movable mass, the first movable mass is connected to the first cylindrical part and is configured to vibrate at a predetermined frequency.

[0029] Technical Solution 2. A dynamic vibration absorber according to Technical Solution 1, wherein the first vibration absorber cylinder includes a second cylindrical part, the first movable mass is inserted between the first cylindrical part and the second cylindrical part, the first movable mass is also connected to the second cylindrical part, and is configured to vibrate at a predetermined frequency between the first cylindrical part and the second cylindrical part.

[0030] Technical Solution 3. A dynamic vibration absorber according to Technical Solution 2, wherein the first cylindrical part and the second cylindrical part are made of a second material, and the first movable mass is made of a first material, the elastic modulus of the second material is smaller than the elastic modulus of the first material, in particular, the elastic modulus of the second material is ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material is one hundred times smaller than the elastic modulus of the first material.

[0031] Technical Solution 4. The dynamic vibration absorber according to Technical Solution 3 further includes an additional mass fixed to any one of the side portions of the first movable mass, and the additional mass is not in contact with the first cylindrical portion and the second cylindrical portion.

[0032] Technical Solution 5. The dynamic vibration absorber according to Technical Solution 2 also includes a first damping layer inserted between the first cylindrical part and the first movable mass, and a second damping layer inserted between the second cylindrical part and the first movable mass, the first movable mass being connected to the first cylindrical part through the first damping layer, and the first movable mass being connected to the second cylindrical part through the second damping layer.

[0033] Technical Solution 6. A dynamic vibration absorber according to Technical Solution 5, wherein the first cylindrical part, the second cylindrical part and the first movable mass are made of a first material, and the first damping layer and the second damping layer are made of a second material, the elastic modulus of the second material is smaller than the elastic modulus of the first material, in particular, the elastic modulus of the second material is ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material is one hundred times smaller than the elastic modulus of the first material.

[0034] Technical Solution 7. A dynamic vibration absorber according to Technical Solution 2, wherein the first movable mass is inserted between the first cylindrical part and the second cylindrical part in a gap-like manner so that the first movable mass does not contact the first cylindrical part and the second cylindrical part, and the first vibration absorber cylinder also includes a first group of connecting elements and a second group of connecting elements, each connecting element in the first group of connecting elements connects the first movable mass to the first cylindrical part, and each connecting element in the second group of connecting elements connects the first movable mass to the second cylindrical part, so that the first movable mass is connected to the first cylindrical part and the second cylindrical part through the first group of connecting elements and the second group of connecting elements.

[0035] Technical Solution 8. A dynamic vibration absorber according to Technical Solution 7, wherein the first movable mass includes a first surface, a second surface opposite to the first surface, a third surface and a fourth surface opposite to the third surface, each connecting element in the first group of connecting elements connects the movable mass and the first surface, each connecting element in the second group of connecting elements is connected to the movable mass and the second surface, the first dynamic vibration cylinder also includes a third group of connecting elements and a fourth group of connecting elements, each connecting element in the third group of connecting elements connects the third surface of the first movable mass and the first cylindrical part or the second cylindrical part, and each connecting element in the fourth group of connecting elements connects the fourth surface of the first movable mass and the first cylindrical part or the second cylindrical part.

[0036] Technical Solution 9. A dynamic vibration absorber according to Technical Solution 8, wherein the first cylindrical part and the second cylindrical part include threaded holes and screws, each screw is engaged in the threaded hole, the first end of each connecting element of the third group and the fourth group is supported by the screw, and the second end of the connecting element is inserted into the first movable mass.

[0037] Technical Solution 10. A dynamic vibration absorber according to any one of Technical Solutions 7 to 9, wherein each connecting element is made of a second material, the first movable mass is made of a first material, and the first cylindrical part and the second cylindrical part are made of a third material, the elastic modulus of the second material is equal to or greater than or less than the elastic modulus of the first material, for example, the elastic modulus of the second material is ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material is one hundred times smaller than the elastic modulus of the first material, and the density of the first material is greater than the density of the third material.

[0038] Technical Solution 11. A dynamic vibration absorber according to any one of Technical Solutions 7 to 10, wherein each connecting element comprises a spring.

[0039] Technical Solution 12. A dynamic vibration absorber according to Technical Solution 1, wherein the first cylindrical part includes a recess extending according to the central axis of the first vibration absorber cylinder and a group of rods protruding from the first cylindrical part and extending in the recess of the first cylindrical part, the first movable mass includes a group of through holes, each rod in the group of the first cylindrical part is inserted into a through hole in the group of through holes of the first movable mass, and the first movable mass is connected to the first cylindrical part through the rods in the group of rods of the first cylindrical part.

[0040] Technical Solution 13. A dynamic vibration absorber according to Technical Solution 1, wherein the first cylindrical portion includes a recess extending according to the central axis of the first vibration absorber cylinder and at least two rods protruding from the first cylindrical portion and extending in the recess of the first cylindrical portion, the first movable mass includes a through hole, the first rod of the first cylindrical portion is inserted into the through hole of the first movable mass, the first vibration absorber cylinder also includes a second movable mass including a through hole, the second rod of the first cylindrical portion is inserted into the through hole of the second movable mass, and the second movable mass is configured to vibrate at a predetermined frequency.

[0041] Technical Solution 14. A dynamic vibration absorber according to Technical Solution 13, wherein the first vibration absorber cylinder includes a second cylindrical part, the second cylindrical part includes a recess extending according to the central axis of the first vibration absorber cylinder and a group of rods protruding from the second cylindrical part and extending in the recess of the second cylindrical part, the first vibration absorber cylinder also includes a movable mass, which includes a group of through holes, each rod of the group of the second cylindrical part is inserted into a through hole in the group of through holes of the movable mass, the movable mass is connected to the second cylindrical part via the rods in the group of rods of the second cylindrical part, and the movable mass is configured to vibrate at a predetermined frequency.

[0042] Technical Solution 15. The dynamic vibration absorber according to any one of Technical Solutions 1 to 14 also includes a second vibration absorber module, the second vibration absorber module includes a second surface of the first support part, a second surface of the second support part, and a second vibration absorber cylinder connecting the second surface of the first support part and the second surface of the second support part, the second vibration absorber cylinder includes a first cylindrical part and at least a first movable mass, the first movable mass of the second vibration absorber cylinder is connected to the first cylindrical part of the second vibration absorber cylinder and is configured to vibrate at a predetermined frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Other characteristics and advantages of the invention will emerge on reading the following description of an embodiment of the invention, provided purely by way of non-limiting example and with reference to the accompanying drawings, in which:

[0044] Figure 1 An example of a rotating electrical machine according to the invention is schematically shown,

[0045] Figure 2 A view schematically showing an example of a dynamic vibration absorber according to the present invention,

[0046] Figure 3 An example of modeling of a dynamic vibration absorber according to the present invention is schematically shown,

[0047] Figure 4 A first example of a vibration absorber cylinder according to the invention is schematically shown,

[0048] Figure 5 A second example of a vibration absorber cylinder according to the invention is schematically shown,

[0049] Figure 6 A third example of a vibration absorber cylinder according to the invention is schematically shown,

[0050] Figure 7 A fourth example of a vibration absorber cylinder according to the invention is schematically shown,

[0051] Figure 8 A fifth example of a vibration absorber cylinder according to the invention is schematically shown,

[0052] Fig. 9 and 10 A sixth example of a vibration absorber cylinder according to the invention is schematically shown, and

[0053] Fig.11 and Fig.12 A seventh example of a vibration absorber cylinder according to the invention is schematically shown. DETAILED DESCRIPTION

[0054] Figure 1 An example of a rotating electrical machine 1 is schematically shown.

[0055] The rotating electrical machine 1 includes a housing 2 , a stator 3 , and a rotor 4 .

[0056] The rotor 4 is inserted into the stator 3 , and the stator 3 is located in the housing 2 .

[0057] The housing 2 is placed at a first end of the anti-vibration mount 5 .

[0058] The second end of the vibration-proof mount 5 is placed on the upper surface of a factory foundation 6 or a foundation of a ship (not shown). The vibration-proof mount 5 is an elastic mount of the machine 1 for reducing the vibration of the machine 1 from being transmitted to the foundation 6.

[0059] The dynamic vibration absorber 7 is arranged on the housing 2 for reducing predetermined vibration generated by the rotation of the rotary electric machine 1. The mass of the machine 1 is supported by the bracket 5 instead of the dynamic vibration absorber 7.

[0060] A direct reference R is defined.

[0061] The reference R is fixed relative to the base 6 , and includes an axis X and an axis Y included in the upper surface of the base 6 , and an axis Z perpendicular to the upper surface of the base 6 .

[0062] The axis X is parallel to the transverse direction of the dynamic vibration absorber 7 , the axis Y is parallel to the longitudinal direction of the dynamic vibration absorber 7 , and the axis Z is parallel to the vertical direction of the dynamic vibration absorber 7 .

[0063] In a variant not shown, a dynamic vibration absorber 7 can be arranged on the stator 3 in order to absorb the vibrations directly on the element generating the vibrations (the stator 3 ).

[0064] In another variant, not shown, the vibration absorber cylinders 13 are arranged in the transverse direction X or in the vertical direction Z or in any different direction.

[0065] Figure 2 A front view of an example of a dynamic vibration absorber 7 is schematically shown.

[0066] The dynamic vibration absorber 7 includes a first supporting portion 8 and a second supporting portion 9 which is spaced apart from the first supporting portion 8 by a first gap Gp.

[0067] The two support parts 8 , 9 are connected together, for example using screws and nuts (not shown) at the ends of the support parts 8 , 9 .

[0068] The dynamic vibration absorber 7 further includes a first vibration absorber module 10 , a second absorber module 11 and a third absorber module 12 .

[0069] In a variant, the dynamic vibration absorber 7 may comprise one, two or more than three vibration absorber modules.

[0070] The first vibration absorber module 10 includes a first surface 8 a of the first supporting portion 8 , a first surface 9 a of the second supporting portion 9 , and a first vibration absorber cylinder 13 connecting the first surface 8 a of the first supporting portion 8 and the first surface 9 a of the second supporting portion 9 .

[0071] The second vibration absorber module 11 includes the second surface 8 b of the first supporting portion 8 , the second surface 9 b of the second supporting portion 9 , and a second vibration absorber cylinder 14 connecting the second surface 8 b of the first supporting portion 8 and the second surface 9 b of the second supporting portion 9 .

[0072] The third vibration absorber module 12 includes the third surface 8 c of the first supporting portion 8 , the third surface 9 c of the second supporting portion 9 , and a third vibration absorber cylinder 15 connecting the third surface 8 c of the first supporting portion 8 and the third surface 9 c of the second supporting portion 9 .

[0073] The first vibration absorber cylinder 13 includes a first cylindrical portion 13a, a second cylindrical portion 13b, and a first movable mass 13c. The first movable mass 13c is inserted between the first cylindrical portion 13a and the second cylindrical portion 13b and connected to the first cylindrical portion 13a and the second cylindrical portion 13b.

[0074] The second vibration absorber cylinder 14 includes a first cylindrical portion 14a, a second cylindrical portion 14b, and a second movable mass 14c. The second movable mass 14c is inserted between the first cylindrical portion 14a and the second cylindrical portion 14b and connected to the first cylindrical portion 14a and the second cylindrical portion 14b.

[0075] The third vibration absorber cylinder 15 includes a first cylindrical portion 15a, a second cylindrical portion 15b and a third movable mass 15c. The third movable mass 15c is inserted between the first cylindrical portion 15a and the second cylindrical portion 15b and connected to the first cylindrical portion 15a and the second cylindrical portion 15b.

[0076] It is assumed that the movable masses 13c, 14c, 15c are made of a first material and have the same mass M1, and that the first and second cylindrical portions 13a, 13b, 14a, 14b, 15a, 15b are made of a second material.

[0077] The elastic modulus of the second material is smaller than that of the first material. Specifically, the elastic modulus of the second material is ten times smaller than that of the first material. Preferably, the elastic modulus of the second material is one hundred times smaller than that of the first material.

[0078] In a variant, the movable masses 13c, 14c, 15c are made of different materials, and the first and second cylindrical parts 13a, 13b, 14a, 14b, 15a, 15b are made of different materials, however, the elastic modulus of the material of each movable mass 13c, 14c, 15c is different from the elastic modulus of the material of the first and second cylindrical parts 13a, 13b, 14a, 14b, 15a, 15b surrounding the movable mass.

[0079] In a variant, the movable masses 13 c , 14 c , 15 c each have a different weight and thus have three different natural frequencies according to equation (1) in order to absorb vibrations of three different frequencies generated by the machine 1 .

[0080] The first, second and third vibration absorber modules 10 , 11 , 12 form a first line.

[0081] In another variant that is not shown, the dynamic vibration absorber 7 comprises at least a second line comprising vibration absorber modules.

[0082] The second lines may be arranged in the longitudinal direction Y and / or the transverse direction X.

[0083] Figure 3 The modelling of the first, second and third vibration absorber modules 10 , 11 , 12 is schematically shown.

[0084] Since the first and second cylindrical portions 13a, 13b, 14a, 14b, 15a, 15b are made of the second material, said portions are modelled by a spring 16 whose stiffness K1 is determined by the elastic modulus of the second material.

[0085] The natural frequency Fo of each vibration absorber module 10, 11, 12 is equal to:

[0086]

[0087] Where Keq is the equivalent stiffness of two springs 16 having stiffness K1 which hold mass M1.

[0088] When the movable masses 13 c , 14 c , 15 c each have a different weight, each vibration absorber module 10 , 11 , 12 has a different natural frequency.

[0089] Since it is assumed that the first, second and third vibration absorber cylinders 13, 14, 15 are identical, Figure 4 Schematically shows Figure 1 and 2 A front view of a first example of a first vibration absorber cylinder 13 is shown in FIG. 1 , without the support portions 8 , 9 .

[0090] A first plane P1 including the axes X and Y directly referenced to R is defined.

[0091] The first movable mass 13 has a reference width l and a reference thickness e.

[0092] The first vibration absorber cylinder 13 includes a plane P2. The plane P2 includes the central axis of the first vibration absorber cylinder 13 and divides the first movable mass 13c into two identical parts.

[0093] The plane P2 defines an angle α with the first plane P1 relative to the lateral direction of the first vibration absorber cylinder 13 .

[0094] The vibration frequencies reduced by the first vibration absorber cylinder 13 in the lateral direction (X axis) and the vertical direction (Z axis) depend on the value of the angle α.

[0095] The vibration frequency F of the first vibration absorber cylinder 13 in the lateral direction is reduced. T Approximately:

[0096]

[0097] The vibration frequency F of the first vibration absorber cylinder 13 in the vertical direction is reduced. V Approximately:

[0098]

[0099] By rotating the first vibration absorber cylinder 13 (which changes the angle α), the vibration frequency reduced by the first vibration absorber cylinder 13 can be adjusted.

[0100] By rotating the first vibration absorber cylinder 13 , the frequency reduced by the first vibration absorber cylinder 13 can be easily tuned.

[0101] According to the value of the angle α, the first vibration absorber cylinder 13 can reduce the vibration frequency in the lateral direction (X axis) and the vertical direction (Z axis) at the same time.

[0102] In addition, the first vibration absorber cylinder 13 can reduce the predetermined frequency F in the torsional direction (Y axis) of the first movable mass 13. θ .

[0103] Predetermined frequency F θ equal:

[0104]

[0105] Depending on the value of the angle α, the vibration absorber modules 10 , 11 , 12 are tuned to reduce frequency vibrations in the lateral direction (X-axis), the vertical direction (Z-axis) and the torsional direction (Y-axis).

[0106] Of course, the angle α of each vibration absorber module 10, 11, 12 of the first line may have different values ​​to reduce the vibrations at different predetermined frequencies F according to the lateral, vertical and torsional directions. V ,F T, F θ Different vibrations under.

[0107] The movable mass 13c is preferably made of steel. The movable mass 13c may be made of a metallic material such as cast iron, copper, lead, aluminium or a different material such as concrete. The cylindrical parts 13a, 13b are preferably made of rubber or any elastic material.

[0108] If the dynamic vibration absorber 7 comprises another line, for example a second line, the angle α of each vibration absorber module of the second line may have different values ​​in order to adjust the dynamic vibration absorber 7 according to different predetermined frequencies F. V ,F T, F θ The lateral, vertical and torsional directions of the bearing are used to reduce different vibrations.

[0109] Figure 5 A second example of the first vibration absorber cylinder 13 is schematically shown.

[0110] The first vibration absorber cylinder 13 includes first and second cylindrical portions 13a, 13b and a first movable mass 13c.

[0111] The first vibration absorber cylinder 13 also includes additional masses 17a, 17b, 17c, 17d having the same weight or having different weights fixed on either side of the side of the first movable mass 13c. For example, the additional masses 17a to 17d can be fixed to the first movable mass 13c by screws.

[0112] Adding additional masses 17a, 17b, 17c, 17d allows modifying the weight M1 of the first movable mass 13c to tune the frequencies in equations (2), (3), (4) and thereby adjust the vibration frequency F reduced in the lateral direction by the first vibration absorber cylinder 13 T and the vibration frequency F reduced in the vertical direction by the first vibration absorber cylinder 13 V , without modifying the angle α.

[0113] In addition, if Figure 4 Modifying the angle α as shown in FIG. 1 and adding masses 17a to 17d to the first movable mass 13c increases the number of combinations for tuning the absorption vibration frequency.

[0114] In a variant, the cylindrical portions 13 a , 13 b have different cross sections forming an angle of, for example, 180°, 120° or 90°.

[0115] Figure 6 A third example of the first vibration absorber cylinder 13 is schematically shown.

[0116] The first vibration absorber cylinder 13 includes first and second cylindrical portions 13a, 13b and a first movable mass 13c.

[0117] The first vibration absorber cylinder 13 further includes a first damping layer 13d interposed between the first cylindrical portion 13a and the first movable mass 13c, and a second damping layer 13e interposed between the second cylindrical portion 13b and the first movable mass 13c.

[0118] The first movable mass 13c is connected to the first cylindrical portion 13a through a first damping layer 13d, and the first movable mass 13c is connected to the second cylindrical portion 13b through a second damping layer 13e.

[0119] The first cylindrical portion 13 a , the second cylindrical portion 13 b and the first movable mass 13 c are made of a first material, and the first and second damping layers 13 d , 13 e are made of a second material.

[0120] The amount of the second material is reduced compared to the amount of the second material required in the first and second examples of the first vibration absorber cylinder 13 .

[0121] The first material may be steel and the second material may be rubber.

[0122] Figure 7 A fourth example of the first vibration absorber cylinder 13 is schematically shown.

[0123] The first vibration absorber cylinder 13 includes first and second cylindrical parts 13a, 13b and a first movable mass 13c, which is inserted between the first and second cylindrical parts 13a, 13b with a gap so that the first movable mass 13c does not contact the first and second cylindrical parts 13a, 13b.

[0124] The first movable mass 13 includes a first surface 18 , a second surface 19 opposite to the first surface 18 , a third surface 20 , and a fourth surface 21 opposite to the third surface 20 .

[0125] The first movable mass 13 c further comprises holes 22 located on the first surface 18 and the second surface 19 .

[0126] The first cylindrical portion 13 a and the second cylindrical portion 13 b comprise holes 23 , each hole 23 of the first cylindrical portion 13 a and the second cylindrical portion 13 b being located in front of the hole 22 of the first movable mass 13 c .

[0127] The first vibration absorber cylinder 13 c further includes a first set of connecting elements 24 and a second set of connecting elements 25 .

[0128] Each connection element 24 , 25 of the first and second sets of connection elements may include a rubber element or a spring or a combination of rubber and spring as shown to adjust the stiffness and damping of the absorber 13 .

[0129] A first end of each connection element 24 of the first set is inserted into a hole 22 on the first surface 18 of the first movable mass 13 c , and a second end of the connection element 24 is inserted into a hole 23 of the first cylindrical portion 13 a in front of the hole 22 on the first surface 18 .

[0130] The first end of each connecting element 25 of the second group is inserted into the hole 22 on the second surface 19 of the first movable mass 13 c , and the second end of the connecting element 25 is inserted into the hole 23 of the second cylindrical portion 13 b in front of the hole 22 on the second surface 19 .

[0131] A first set of connecting elements 24 connects the first movable mass 13c to the first cylindrical part 13a and a second set of connecting elements 25 connects the first movable mass 13c to the second cylindrical part 13b, so that the first movable mass 13c is connected to the first cylindrical part 13a and the second cylindrical part 13b by the first and second set of connecting elements 24, 25.

[0132] The stiffness K1 in equation (2) is determined by the stiffness of the connecting elements 24 , 25 of the first and second groups.

[0133] The frequency Fo can be tuned by modifying the stiffness of the connecting elements 24 , 25 of the first and second groups or by removing some of the connecting elements 24 , 25 .

[0134] Each connecting element of the first and second sets of connecting elements may be made of the second material.

[0135] The first movable mass 13c may be made of a first material.

[0136] In this example, the first and second cylindrical portions 13a, 13b are made of a third material.

[0137] The density of the first material is greater than that of the third material to avoid spurious frequencies that may be generated by the first and second cylindrical portions 13 a , 13 b .

[0138] Figure 8 A fifth example of the first vibration absorber cylinder 13 is schematically shown.

[0139] A fourth example of the first vibration absorber cylinder 13 is Figure 7 The fourth example of the first vibration absorber cylinder 13 shown in is different in that the first vibration absorber cylinder 13 further includes a third group of connecting elements 29 and a fourth group of connecting elements 30 .

[0140] Each connecting element 29 in the third group of connecting elements connects the third surface 20 of the first movable mass 13c and the first cylindrical part 13a or the second cylindrical part 13b, and each connecting element 30 in the fourth group of connecting elements connects the fourth surface 21 of the first movable mass 13c and the first cylindrical part 13a or the second cylindrical part 13b.

[0141] Each connection element 29 , 30 of the third and fourth sets of connection elements may comprise a rubber element or a spring as shown.

[0142] The first cylindrical portion 13a comprises on either side extensions 27a, 27b which partially surround the third and fourth surfaces 20, 21 of the first movable mass 13c, and the second cylindrical portion 13b comprises on either side extensions 28a, 28b which partially surround the third and fourth surfaces 20, 21 of the first movable mass 13c.

[0143] The first movable mass 13 c further comprises holes 31 located on the third and fourth surfaces 20 , 21 .

[0144] The extensions 27a, 27b, 28a, 28b of the first and second cylindrical parts 13a, 13b comprise holes 32, each hole 32 of the extensions 27a, 27b, 28a, 28b of the first and second cylindrical parts 13a, 13b being located in front of the hole 31 of the first movable mass 13c.

[0145] The first end of each connecting element 29 in the third group is inserted into the hole 31 on the third surface 20 of the first movable mass 13c, and the second end of the connecting element 29 is inserted into the hole 32 of the first cylindrical part 13a or the second cylindrical part 13b in front of the hole 31 on the third surface 20.

[0146] The first end of each connecting element 30 in the fourth group is inserted into the hole 31 on the fourth surface 21 of the first movable mass 13c, and the second end of the connecting element 30 is inserted into the hole 32 of the first cylindrical part 13a or the second cylindrical part 13b in front of the hole 31 on the fourth surface 21.

[0147] The third of the fourth set of connecting elements allows doubling the number of frequencies reduced by the first vibration absorber cylinder 13 .

[0148] In addition, the cylinder 13 is Figure 4 The rotation of a certain angle α shown in increases the number of combinations and tunings of the absorbed frequencies.

[0149] In a modification, as shown in the figure, the hole 32 of the extension 27a, 27b, 28a, 28b may be a threaded hole, and the first vibration absorber cylinder 13 includes a screw 33. Each screw 33 engages in the hole 32. The first end of each connecting element 29, 30 of the third and fourth groups is supported by the screw 33, and the second end of the connecting element 29, 30 is inserted into the first movable mass 13c.

[0150] The screws 33 preload the connecting elements 29 , 30 and access to the connecting elements 29 , 30 is facilitated by removing the screws 33 .

[0151] Fig. 9 and Fig.10A sixth example of a first vibration absorber cylinder 13 is schematically shown in partial cross-section and longitudinal view.

[0152] Fig. 9 A cross section of the first cylindrical portion 13a is schematically shown.

[0153] The first cylindrical portion 13 a includes a recess 34 extending according to the central axis of the first vibration absorber cylinder 13 and a group of rods 35 protruding from the first cylindrical portion 13 a and extending in the recess 34 of the first cylindrical portion 13 a .

[0154] The first movable mass 13 c comprises a set of through holes 36 .

[0155] Each rod 35 of the set of first cylindrical parts 13 a is inserted into a through hole 36 of the set of through holes of the first movable mass 13 c .

[0156] The first movable mass 13c is connected to the first cylindrical part 13a via a rod 35 of the set of rods of the first cylindrical part 13a.

[0157] The total stiffness K1 in equation (2) is determined by the bending stiffness of the rod 35. The frequency F0 can be tuned by modifying the stiffness of the rod 35 (the cross section of the rod 35 or the material of the rod 35), removing at least one rod 35, or by sliding the movable mass 13c on the rod 35 to modify the bending stiffness of the rod 35.

[0158] In addition, if Figure 4 As shown in , the rotation of the cylinder 13 from a certain angle α increases the number of combinations and tunings of the absorbed frequencies.

[0159] Fig.11 and 12 A seventh example of a first vibration absorber cylinder 13 is schematically shown in partial cross-section and longitudinal view.

[0160] Fig.11 A cross section of the first cylindrical portion 13a is schematically shown.

[0161] The first cylindrical portion 13 a includes a recess 37 extending according to the central axis of the first vibration absorber cylinder 13 and a group of rods 38 protruding from the first cylindrical portion 13 a and extending in the recess 37 of the first cylindrical portion 13 a .

[0162] The first movable mass 13 c includes a through hole 39 .

[0163] A first rod of the set of rods 38 of the first cylindrical portion 13 a is inserted into the through hole 39 of the first movable mass 13 c .

[0164] The first vibration absorber cylinder 13 also includes a second movable mass 40 including the through hole 39 , a third movable mass 41 including the through hole 39 , a fourth movable mass 42 including the through hole 39 and a mass 42 bis , and a fifth movable mass 43 including the through hole 39 and a mass 43 bis .

[0165] The second rod among the group of rods 38 of the first cylindrical part 13a is inserted into the through hole 39 of the second movable mass 40, the third rod among the group of rods 38 of the first cylindrical part 13a is inserted into the through hole 39 of the third movable mass 41, the fourth rod among the group of rods 38 of the first cylindrical part 13a is inserted into the through hole 39 of the fourth movable mass 42 and the mass 42bis, and the fifth rod among the group of rods 38 of the first cylindrical part 13a is inserted into the through hole 39 of the fifth movable mass 43 and the mass 43bis.

[0166] The weight of each movable mass 13c, 40, 41, 42, 42bis, 43, 43bis may be different so that each movable mass has a different natural frequency, each movable mass 13c, 40, 41, 42, 43 reducing vibrations having a frequency equal to the natural frequency of said movable mass.

[0167] The frequency F0 can be tuned by sliding the movable mass 13 c , 40 , 41 , 42 , 43 on the rod 38 to modify the bending stiffness of the rod 38 .

[0168] In addition, if Figure 4 As shown in , the rotation of the cylinder 13 from a certain angle α increases the number of combinations and tunings of the absorbed frequencies.

[0169] In another embodiment, Fig. 9 , 10 , 11, and 12 are combined so that the seventh example of the first vibration absorber cylinder 13 includes a second cylindrical portion 13b, which includes a recess 34 extending according to the central axis of the first vibration absorber cylinder 13 and a group of rods 35 protruding from the second cylindrical portion 13a and extending in the recess 34 of the second cylindrical portion 13a, and a movable mass including a through hole, and the rods 35 of the second cylindrical portion 13a are inserted into the hole of the movable mass of the second cylindrical portion 13a.

[0170] exist Figures 5 to 12 In the example of the vibration absorber shown in Figure 4 The natural frequency F0 is tuned by a rotation of the angle α indicated in , without changing the material or dimensions of the components of the cylinder 13 .

Claims

1. A dynamic vibration absorber (7), characterized in that: The dynamic vibration absorber comprises a first support portion (8), a second support portion (9) separated from the first support portion by a first gap, and at least a first vibration absorber module (10), the first vibration absorber module (10) comprising a first surface (8a) of the first support portion, a first surface (9a) of the second support portion, and a first vibration absorber cylinder (13) connecting the first surface of the first support portion and the first surface of the second support portion, the first vibration absorber cylinder comprising a first cylindrical portion (13a) and at least a first movable mass (13c), the first movable mass being connected to the first cylindrical portion and configured to vibrate at a predetermined frequency.

2. The dynamic vibration absorber according to claim 1, wherein: The first vibration absorber cylinder (13) includes a second cylindrical portion (13b), the first movable mass (13c) is inserted between the first cylindrical portion (13a) and the second cylindrical portion (13b), the first movable mass is also connected to the second cylindrical portion, and is configured to vibrate at a predetermined frequency between the first cylindrical portion and the second cylindrical portion.

3. The dynamic vibration absorber according to claim 2, wherein: The first cylindrical part (13a) and the second cylindrical part (13b) are made of a second material, and the first movable mass (13c) is made of a first material, the elastic modulus of the second material is smaller than the elastic modulus of the first material, in particular, the elastic modulus of the second material is ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material is one hundred times smaller than the elastic modulus of the first material.

4. The dynamic vibration absorber according to claim 3 further includes an additional mass (17a, 17b, 17c, 17d) fixed to any one of the side portions of the first movable mass (13c), and the additional mass is not in contact with the first cylindrical portion (13a) and the second cylindrical portion (13b).

5. The dynamic vibration absorber according to claim 2 further includes a first damping layer (13d) inserted between the first cylindrical part (13a) and the first movable mass (13c), and a second damping layer (13e) inserted between the second cylindrical part (13b) and the first movable mass (13c), the first movable mass being connected to the first cylindrical part through the first damping layer, and the first movable mass being connected to the second cylindrical part through the second damping layer.

6. The dynamic vibration absorber according to claim 5, wherein: The first cylindrical part (13a), the second cylindrical part (13b) and the first movable mass (13c) are made of a first material, and the first damping layer (13d) and the second damping layer (13e) are made of a second material, the elastic modulus of the second material is smaller than the elastic modulus of the first material, in particular, the elastic modulus of the second material is ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material is one hundred times smaller than the elastic modulus of the first material.

7. The dynamic vibration absorber according to claim 2, wherein: The first movable mass (13c) is inserted between the first cylindrical part (13a) and the second cylindrical part (13b) in a gap-forming manner so that the first movable mass does not contact the first cylindrical part and the second cylindrical part, and the first vibration absorber cylinder (13) also includes a first group of connecting elements (24) and a second group of connecting elements (25), each connecting element in the first group of connecting elements connects the first movable mass to the first cylindrical part, and each connecting element in the second group of connecting elements connects the first movable mass to the second cylindrical part, so that the first movable mass is connected to the first cylindrical part and the second cylindrical part through the first group of connecting elements and the second group of connecting elements.

8. The dynamic vibration absorber according to claim 7, wherein: The first movable mass (13c) includes a first surface (18), a second surface (19) opposite to the first surface, a third surface (20) and a fourth surface (21) opposite to the third surface, each connecting element in the first group of connecting elements (24) connects the movable mass and the first surface, each connecting element in the second group of connecting elements (25) connects the movable mass and the second surface, and the first dynamic vibration cylinder (13) also includes a third group of connecting elements (29) and a fourth group of connecting elements (30), each connecting element in the third group of connecting elements connects the third surface of the first movable mass and the first cylindrical part or the second cylindrical part, and each connecting element in the fourth group of connecting elements connects the fourth surface of the first movable mass and the first cylindrical part or the second cylindrical part.

9. The dynamic vibration absorber according to claim 8, wherein: The first cylindrical part (13a) and the second cylindrical part (13b) include a threaded hole (31) and a screw (33), each screw is engaged in the threaded hole, the first end of each connecting element of the third group and the fourth group is supported by the screw, and the second end of the connecting element is inserted into the first movable mass.

10. The dynamic vibration absorber according to any one of claims 7 to 9, wherein: Each connecting element (24, 25, 29, 30) is made of a second material, the first movable mass (13c) is made of a first material, and the first cylindrical part (13a) and the second cylindrical part (13b) are made of a third material, the elastic modulus of the second material is equal to or greater than or less than the elastic modulus of the first material, for example, the elastic modulus of the second material is ten times smaller than the elastic modulus of the first material, preferably, the elastic modulus of the second material is one hundred times smaller than the elastic modulus of the first material, and the density of the first material is greater than the density of the third material.

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