CN113531043A - Dynamic vibration absorber and method for adjusting vibration frequency thereof - Google Patents
Dynamic vibration absorber and method for adjusting vibration frequency thereof Download PDFInfo
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- CN113531043A CN113531043A CN202010315852.5A CN202010315852A CN113531043A CN 113531043 A CN113531043 A CN 113531043A CN 202010315852 A CN202010315852 A CN 202010315852A CN 113531043 A CN113531043 A CN 113531043A
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- mass
- vibration absorber
- dynamic vibration
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- quality piece
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/22—Compensation of inertia forces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/04—Frequency effects
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a dynamic vibration absorber and a method for adjusting vibration frequency of the dynamic vibration absorber. The method for adjusting the vibration frequency of the dynamic vibration absorber comprises the steps of increasing or decreasing the number of additional mass blocks adsorbed on the basic mass block and/or changing the hardness of the rubber plug. The invention uses the rubber plug as the elastic and damping element of the dynamic vibration absorber, and can flexibly adjust the vibration frequency and the damping of the dynamic vibration absorber by increasing and decreasing the number of the additional mass blocks absorbed on the basic mass block and/or changing the hardness of the used rubber plug, has wide application range, omits the cycle of redesigning and manufacturing, saves the manufacturing cost and improves the efficiency of solving the problem.
Description
Technical Field
The present invention relates to the field of vibration control, and more particularly, to a dynamic vibration absorber and a method of adjusting a vibration frequency of the dynamic vibration absorber.
Background
A Dynamic Vibration Absorber (DVA) is a vibration damping device that connects an auxiliary mass to a vibration system through an elastic element, and can be generally simplified to a single degree of freedom vibration system consisting of a mass, an elastic element, and a damping element. When the dynamic vibration absorber works, the vibration state of the main system is changed by adjusting the self structure form, the dynamic parameters and the coupling relation with the main system, so that the aim of reducing the forced vibration response of the main vibration system in an expected frequency band is fulfilled. Through the dynamic action of the auxiliary mass, the acting force of the elastic element of the vibration absorber on the main system can counteract part or most of the external exciting force acting on the main system to weaken the vibration of the main system, which is equivalent to transfer the vibration energy of the main system to the dynamic vibration absorber.
In the process of solving the problems of noise, vibration and harshness (NVH) of the whole vehicle, the problem of vibration noise in the vehicle is firstly decomposed by an objective test and data analysis method, and is verified by a mode of reinforcing rigidity or adding a dynamic vibration absorber after being positioned to a specific part. However, since the structure needs to be changed to enhance the rigidity, the modification margin is not large in the later stage of final data distribution (FDJ), and therefore, the dynamic vibration absorber is the fastest and effective verification and implementation method.
However, due to different reasons for problems, the frequency of the required dynamic vibration absorber is not fixed, while the existing dynamic vibration absorber is designed for a fixed frequency and damping, the parameters of the existing dynamic vibration absorber cannot be adjusted, and it is difficult to design and manufacture or find a suitable dynamic vibration absorber in a short time for verification, so that the universality is not strong.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for adjusting the vibration frequency of a dynamic vibration absorber and the dynamic vibration absorber.
According to an aspect of the present invention, there is provided a method of adjusting a vibration frequency of a dynamic vibration absorber, the dynamic vibration absorber including a mounting bracket, a mass, and a rubber plug for connecting the mass to the mounting bracket, the method comprising:
providing a basic mass and at least one additional mass, the additional mass being attached to the basic mass by means of magnetic attraction; and the number of the first and second groups,
increase and decrease adsorb on basic quality piece the quantity of additional quality piece, and/or change the hardness of rubber buffer.
According to an alternative embodiment of the invention, the method comprises adsorbing respectively on the base mass at least two additional masses having the same circular arc radius along the periphery of the base mass, or superimposing on the base mass at least two additional masses having successively increasing circular arc radii.
According to an alternative embodiment of the invention, said magnetically attracting is achieved by making said additional mass of magnets.
According to yet another aspect of the present invention, there is provided a dynamic vibration absorber comprising a mounting bracket, a mass and a rubber plug for connecting the mass to the mounting bracket, the mass comprising a base mass and at least one additional mass attached to the base mass by means of magnetic attraction.
According to an alternative embodiment of the invention, the additional mass is coaxial to the basic mass and has a cross section in the shape of a circular arc, the circular arc comprising at least an 1/4 circular arc, a 1/3 circular arc or a 1/2 circular arc.
According to an alternative embodiment of the invention, said mass comprises at least two of said additional masses, each of said additional masses having the same circular arc radius or sequentially increasing circular arc radii.
According to an alternative embodiment of the invention, the base mass and the additional mass are of the same length in the axial direction, or the additional mass is of a smaller length than the base mass.
According to an alternative embodiment of the invention, the mounting bracket is a U-shaped bracket, the bottom of which is provided with a mounting hole for connecting a vehicle, and the side of which is symmetrically provided with a first connecting hole for a rubber plug.
According to an alternative embodiment of the present invention, the rubber stopper has a first mounting groove and a second mounting groove, the base mass has a second connection hole, the first mounting groove is engaged with the first connection hole, and the second mounting groove is engaged with the second connection hole.
According to an alternative embodiment of the invention, the dynamic vibration absorber comprises at least two pairs of said rubber stoppers, each pair of said rubber stoppers having a different hardness.
According to an alternative embodiment of the invention, said additional mass is made of a magnet.
Compared with the prior art, the dynamic vibration absorber disclosed by the technical scheme has the following beneficial effects:
the rubber plug is used as an elastic and damping element of the dynamic vibration absorber, so that the dynamic vibration absorber has good linearity in a small deformation range and stable performance at normal temperature; the vibration frequency and the damping of the dynamic vibration absorber can be flexibly adjusted by increasing or decreasing the number of the additional mass blocks adsorbed on the basic mass block and/or changing the hardness of the used rubber plug, the application range is wide, the redesign and manufacturing period is omitted, the manufacturing cost is saved, and the problem solving efficiency is improved.
Drawings
Other features and advantages of the present invention will be better understood by the following detailed description of the preferred embodiments when considered in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and wherein:
fig. 1 is an exploded schematic view of a dynamic vibration absorber according to an embodiment of the present invention;
fig. 2 is a partial structural view of a dynamic vibration absorber according to an embodiment of the present invention;
fig. 3a is a schematic structural view of an additional mass according to an embodiment of the present invention, and fig. 3b is a schematic structural view of an additional mass according to another embodiment of the present invention;
fig. 4 is a schematic structural view of a rubber stopper according to an embodiment of the present invention;
fig. 5 is a schematic plan view of the dynamic vibration absorber shown in fig. 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this specification, the terms "first" and "second" are not used to limit the order and number of components unless otherwise specified.
In an exemplary embodiment, as shown in fig. 1 and 2, the dynamic vibration absorber 10 includes a mounting bracket 1, a mass 2, and a rubber plug 3, wherein the rubber plug 3 is used to connect the mass 2 to the mounting bracket 1. Further, the mass 2 comprises a base mass 21 and at least one additional mass, as in the embodiment shown in fig. 1, the additional mass comprises a first additional mass 22 and a second additional mass 22a, and the number of the first additional mass 22 and the second additional mass 22a is three as shown in the figure.
In particular, the first additional mass 22 and the second additional mass 22a are coaxial to the base mass 21, and the first additional mass 22 and the second additional mass 22a each have a circular arc-shaped cross section. It can also be said that the first additional mass 22 or the second additional mass 22a, after attachment to the basic mass 21, can have an arc-like shape conforming to the outer surface of the basic mass 21. For the attachment of the first additional mass 22 or the second additional mass 22a to the base mass 21, the present invention employs a magnetic attraction manner, which facilitates flexible adjustment of the weight of the mass 2, thereby changing the vibration frequency of the dynamic vibration absorber 10.
In an alternative embodiment, the additional mass is made of a magnet.
In an alternative embodiment, as shown in fig. 3a, the circular arc cross section of the additional mass is 1/2 circular arc, so that two additional masses with the same circular arc radius can be attached at the same periphery of base mass 21; whereas in fig. 3b the circular arc cross section of the additional mass is 1/4 circular arc, this configuration enables the attachment of four additional masses with the same circular arc radius on the same periphery of the base mass 21; then, for an 1/3 circular arc cross-section, three additional masses with the same circular arc radius can be attached to the same periphery of base mass 21.
In an alternative embodiment, the additional masses can also have successively increasing radii of the circular arcs, in addition to the same radii of the circular arcs. As shown in fig. 1, the first additional masses 22 are additional masses having a cross section of 1/2 circular arc, and include a small additional mass 221, a middle additional mass 222, and a large additional mass 223, wherein the small additional mass 221, the middle additional mass 222, and the large additional mass 223 have sequentially increasing arc radii, so that the small additional mass 221, the middle additional mass 222, and the large additional mass 223 have a sequential order when attached to the base mass 21, and the middle additional mass 222 can fit the outer surface of the small additional mass 221, and the large additional mass 223 can fit the outer surface of the middle additional mass 222. As shown in fig. 1, the second additional masses 22a are each an additional mass having a cross section of 1/4 circular arc, and the three additional masses included therein also have successively increasing circular arc radii. Alternatively, additional masses with corresponding circular arc radii are provided for the peripheries of different diameters of the base mass 21, and additional masses with the same circular arc radii of circular arc shapes of 1/2, 1/3, 1/4, etc. may be attached to the periphery of the base mass 21 of the same diameter at the same time.
In an alternative embodiment, since the additional mass is coaxial with the base mass 21, the base mass 21 and the additional mass have the same length in the axial direction, as shown in fig. 1, and the first additional mass 22, the second additional mass 22a and the base mass 21 have the same length in the axial direction. Optionally, the length of the additional mass is smaller than the base mass 21, e.g. 1/2, 1/3, 1/4, etc. of the base mass 21 in the axial direction, which allows a more flexible adjustment of the weight of the mass 2 with a smaller amplitude to meet the requirements of different vibration frequencies.
In an alternative embodiment, as shown in fig. 1, 2 and 5, the mounting bracket 1 is a U-shaped bracket, the bottom of which is provided with a mounting hole 12 for attaching a vehicle, the side of which is symmetrically provided with a first attaching hole 11 for a rubber stopper 3, and the base mass 21 has a second attaching hole 210. As shown in fig. 4, the rubber stopper 3 has a first mounting groove 31 and a second mounting groove 32, wherein the first mounting groove 31 is engaged with the first coupling hole 11, and the second mounting groove 32 is engaged with the second coupling hole 210 (shown by a dotted line in the drawing). Specifically, the second mounting groove 32 of the rubber plug 3 is pushed into the second connecting hole 210 of the base mass 21 by means of compression deformation, as can be seen from fig. 5, the cross section of the second connecting hole 210 is a T-shaped hole with a step 211, and the head 33 of the front end of the second mounting groove 32 of the rubber plug 3 is clamped on the step 211 of the second connecting hole 210. And, the first mounting groove 31 of the rubber stopper 3 is engaged with the first coupling hole 11 by means of press-deformation. It can be seen that the rubber plug 3 makes the mounting bracket 1 and the mass 2 stably connected and easily removable and replaceable. Therefore, at least two pairs of rubber stoppers 3 having different hardness can be provided to change the damping of the dynamic vibration absorber 10, thereby changing the vibration frequency.
The present invention also discloses a method of adjusting the vibration frequency of the dynamic-vibration absorber 10 according to the embodiment of the dynamic-vibration absorber 10 shown in fig. 1-5. According to simple model of single degree of freedom system vibration, system vibration frequency
In the dynamic vibration absorber 10 of the present invention, the value of k depends on the rigidity of the rubber stopper 3, while the rigidity of the rubber stopper 3 depends on the hardness thereof, and the value of m depends on the weight of the mass 2. Therefore, the method of adjusting the vibration frequency of the dynamic vibration absorber 10 includes increasing or decreasing the number of additional masses adsorbed on the base mass 21 or changing the hardness of the rubber stopper 3, or both increasing or decreasing the number of additional masses adsorbed on the base mass 21 and changing the hardness of the rubber stopper 3.
For the additional masses with the same arc radius, which are adsorbed on the periphery of the same diameter of the base mass 21, 1/2, 1/3, 1/4 arc shapes and other shapes and additional masses with different axial lengths can be adsorbed; for the additional masses with the sequentially increasing arc radii, the additional masses are superposed and adsorbed on the base mass 21 and the peripheries of different diameters after the additional masses are adsorbed, and the adsorption has a sequential order, so that the additional masses with different axial lengths and the shapes of 1/2, 1/3, 1/4 arc and the like can be adsorbed.
Compared with the prior art, the weight of the mass block 2 is changed by the dynamic vibration absorber 10 in a magnetic attraction mode, and the rubber plugs 3 with different hardness can be replaced, so that the vibration frequency and the damping of the dynamic vibration absorber are changed according to requirements, the requirements on different parameters of the dynamic vibration absorber are met, and the dynamic vibration absorber is suitable for all vehicle types.
The disclosed exemplary embodiments of the invention may be subject to various substitutions, combinations or modifications, and all such variations are within the spirit of the invention and scope of the invention as defined by the appended claims.
Claims (11)
1. The utility model provides a method of adjusting dynamic vibration absorber vibration frequency, dynamic vibration absorber includes installing support, quality piece and rubber buffer, the rubber buffer be used for with the quality piece is connected to the installing support, its characterized in that, the method includes:
providing a basic mass and at least one additional mass, the additional mass being attached to the basic mass by means of magnetic attraction; and the number of the first and second groups,
increase and decrease adsorb on basic quality piece the quantity of additional quality piece, and/or change the hardness of rubber buffer.
2. The method of adjusting the vibration frequency of a dynamic vibration absorber according to claim 1, wherein said method comprises adsorbing at least two said additional masses having the same arc radii separately onto said base mass along the periphery of said base mass or superimposing at least two additional masses having successively increasing arc radii onto said base mass.
3. The method of adjusting the vibration frequency of a dynamic vibration absorber according to claim 1 or 2, wherein said magnetically attracting is performed by making said additional mass from a magnet.
4. The utility model provides a dynamic vibration absorber, includes installing support, quality piece and rubber buffer, the rubber buffer be used for with the quality piece is connected to installing support, its characterized in that, the quality piece includes basic quality piece and at least one additional quality piece, additional quality piece through the mode of magnetism inhale attach to basic quality piece.
5. The dynamic vibration absorber of claim 4 wherein said additional mass is coaxial with said base mass and has a cross-section in the shape of a circular arc, said circular arc comprising at least the 1/4 circular arc, the 1/3 circular arc or the 1/2 circular arc.
6. The dynamic vibration absorber of claim 4 or 5 wherein said mass comprises at least two of said additional masses, each of said additional masses having the same arc radius or sequentially increasing arc radii.
7. The dynamic vibration absorber of claim 4 or 5 wherein the base mass and the additional mass are the same length or the additional mass is shorter in length than the base mass in the axial direction.
8. The dynamic vibration absorber according to claim 4 or 5 wherein said mounting bracket is a U-shaped bracket provided at the bottom with mounting holes for attaching to a vehicle and symmetrically provided at the sides with first attachment holes for rubber stoppers.
9. The dynamic vibration absorber according to claim 8, wherein the rubber stopper has a first mounting groove and a second mounting groove, the base mass has a second coupling hole, the first mounting groove is engaged with the first coupling hole, and the second mounting groove is engaged with the second coupling hole.
10. The dynamic vibration absorber according to claim 4 or 5, wherein said dynamic vibration absorber comprises at least two pairs of said rubber stoppers, each pair of said rubber stoppers having a different hardness.
11. The dynamic vibration absorber of claim 4 or 5 wherein said additional mass is made of magnets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010315852.5A CN113531043A (en) | 2020-04-20 | 2020-04-20 | Dynamic vibration absorber and method for adjusting vibration frequency thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010315852.5A CN113531043A (en) | 2020-04-20 | 2020-04-20 | Dynamic vibration absorber and method for adjusting vibration frequency thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113531043A true CN113531043A (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010315852.5A Pending CN113531043A (en) | 2020-04-20 | 2020-04-20 | Dynamic vibration absorber and method for adjusting vibration frequency thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113531043A (en) |
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2020
- 2020-04-20 CN CN202010315852.5A patent/CN113531043A/en active Pending
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