CN109404460B

CN109404460B - Combined laminated friction damping vibration absorber under magnetic constraint

Info

Publication number: CN109404460B
Application number: CN201811487486.0A
Authority: CN
Inventors: 王金元; 赵春婕
Original assignee: Shaanxi University of Technology
Current assignee: Shaanxi University of Technology
Priority date: 2018-12-06
Filing date: 2018-12-06
Publication date: 2020-08-04
Anticipated expiration: 2038-12-06
Also published as: CN109404460A

Abstract

The application discloses a combined laminated friction damping vibration absorber under magnetic constraint, which comprises a friction lamination, a substrate, permanent magnets, a fixing groove, an arc-shaped substrate, a steel wire and a mass block, wherein a cavity is formed inside the friction lamination, a plate body of the substrate is embedded into the cavity, a plurality of permanent magnets are fixedly arranged on the surface of the friction lamination, the arc-shaped substrate is arranged at the head end of the substrate, end points of two ends of the arc-shaped substrate are connected through the steel wire, and the mass block is fixedly arranged in the middle of the steel wire; the tail end of the friction lamination is provided with the fixing groove which is sunken inwards. The vibration absorber can show strong vibration absorbing and damping effects under special conditions, the spring mass vibrator with the cubic stiffness and the multilayer flexible cantilever beam structure are used for replacing a traditional dynamic vibration absorber, the matching frequency is wide, random vibration frequency can be well adapted, and vibration energy transmitted to the combined structure by affected equipment can be greatly dissipated.

Description

Combined laminated friction damping vibration absorber under magnetic constraint

Technical Field

The present disclosure relates generally to vibration absorbers and, more particularly, to a combined stack-up friction damped vibration absorber under magnetic restraint.

Background

Various types of equipment mounted on a moving platform or facility are always in a vibrating environment, and in most cases, vibration is harmful, which causes dynamic deformation and alternating stress of mechanical mechanisms, and the deformation and stress can cause fatigue of equipment structures and damage of internal components, and shorten the service life of parts or components, so that active or passive vibration control of the equipment and the internal components thereof is a necessary work.

Vibration control can be classified into three categories, vibration source suppression, vibration isolation, and vibration absorption or vibration absorption, depending on the vibration absorption measures for the vibration source and the affected equipment/component. The vibration absorption or vibration absorption is realized by adding a special elastic-mass device on the affected equipment to form a special master-slave vibration system, and when the natural frequency of the elastic-mass device is tuned to ensure that the ratio of the natural frequency of the elastic-mass device to the natural frequency of the affected equipment meets a specific value, the dynamic force between the device and the affected equipment can be used for absorbing the kinetic energy of the vibration system so as to reduce the vibration response on the affected equipment and realize vibration absorption. In fact, whatever the type of damping measures taken, the main aim is to eliminate or attenuate the problems of structural resonances that occur in the vibrating environment of the equipment and its components.

In a random vibration environment, mechanical equipment is always subjected to vibration excitation of a wide-band frequency, and the design that the natural frequency of the mechanical equipment is far away from the frequency of a vibration source is difficult to realize. In the current passive vibration damping design practice of mechanical equipment, measures such as adjusting structural rigidity, damping by adhering a viscoelastic damping layer on the surface, using a vibration absorber and the like are mainly adopted, but the measures are limited by practical conditions such as mechanical part layout, heat dissipation, installation and the like, and the vibration damping effect is not ideal.

Although the traditional damping vibration attenuation technology is widely applied, the defects exist, for example, the performance of the viscoelastic damper is easily affected by external environmental factors such as corrosion, temperature and the like, and the damping performance of the viscoelastic material is reduced due to aging, creep, brittle fracture and the like. The dry friction damping technology is easy to implement, has a good vibration reduction effect under a severe environment, and is one of the hot spots of current scientific research. In order to solve the problems mentioned above, the scheme provides a combined laminated friction damping vibration absorber under magnetic constraint.

Disclosure of Invention

In view of the above-identified deficiencies or inadequacies in the prior art, it would be desirable to provide a combined laminated friction damped vibration absorber under magnetic restraint.

In a first aspect,

according to the technical scheme provided by the embodiment of the application, the combined laminated friction damping vibration absorber under magnetic constraint comprises a friction lamination, a substrate, permanent magnets, a fixed groove, an arc-shaped substrate, a steel wire and a mass block, wherein a cavity is formed inside the friction lamination, a plate body of the substrate is embedded into the cavity, a plurality of permanent magnets are fixedly arranged on the surface of the friction lamination, the arc-shaped substrate is arranged at the head end of the substrate, the substrate and the arc-shaped substrate are of an integrated structure, the end points of the two ends of the arc-shaped substrate are connected through the steel wire, and the mass block is fixed in the middle of the steel wire; the tail end of the friction lamination is provided with the fixing groove which is sunken inwards.

In this application, the fixed slot is a U-shaped slot.

In this application, the friction laminate and the substrate are located at the middle position of the arc-shaped substrate.

In this application, the friction stromatolite is two segmentations, is inlayer stromatolite and outer stromatolite respectively, and outer stromatolite cover is in the outside of inlayer stromatolite, the head end of inlayer stromatolite extends to the outside of outer stromatolite.

In the application, the surfaces of the inner lamination layer and the outer lamination layer are respectively provided with two permanent magnets, and the same interval is kept between every two permanent magnets (3).

The beneficial effect of this application: the vibration absorber can show stronger vibration absorbing and damping effects under special conditions (extreme temperature, corrosion conditions, heavy load and the like), the cubic-stiffness spring mass vibrator and the multilayer flexible cantilever beam structure are used for replacing the traditional dynamic vibration absorber, the matching frequency is wider, the random vibration frequency can be well adapted, and the vibration energy transmitted to the combined structure by the affected equipment can be greatly dissipated.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of the present application;

fig. 2 is a schematic top view of the present application.

Reference numbers in the figures: 1. the structure comprises a friction lamination layer, a base plate 2, a permanent magnet 3, a fixing groove 4, an arc base plate 5, a steel wire 6, a mass block 7, an inner lamination layer 1.1 and an outer lamination layer 1.2.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 and 2, a combined laminated friction damping vibration absorber under magnetic constraint includes a friction laminate 1, a substrate 2, permanent magnets 3, a fixing groove 4, an arc-shaped substrate 5, a steel wire 6 and a mass block 7, the friction laminate 1 is a cavity, the friction laminate 1 is of two sections, which are respectively an inner laminate 1.1 and an outer laminate 1.2, the outer laminate 1.2 is sleeved outside the inner laminate 1.1, the head end of the inner laminate 1.1 extends to the outside of the outer laminate 1.2, the plate body of the substrate 2 is embedded inside the cavity, a plurality of permanent magnets 3 are fixed on the surface of the friction laminate 1, and two permanent magnets 3 are respectively arranged on the surfaces of the inner laminate 1.1 and the outer laminate 1.2. The head end of the base plate 2 is provided with the arc base plate 5, and the base plate 2 and the arc base plate 5 are of an integrated structure. The friction laminated layer 1 and the substrate 2 are positioned in the middle of the arc-shaped substrate 5; the end points of the two ends of the arc-shaped substrate 5 are connected through the steel wire 6, and the mass block 7 is fixed in the middle of the steel wire 6; the tail end of the friction laminated layer 1 is provided with the fixing groove 4 which is inwards sunken, and the fixing groove 4 is a U-shaped groove.

The vibration absorber is a multi-layer cantilever beam structure which is symmetrical up and down, a base plate 2 is structural steel (Q235), a friction laminated layer 1 is an aluminum plate (A L1060), a permanent magnet 3 is rare earth permanent magnet material (NdFeB) and can provide corresponding normal restraint and load for the friction laminated layer 1, a mass block 7 is the structural steel (Q235), a steel wire 6 is spring steel (65Mn), the mass block 7 and the spring steel jointly form a spring mass oscillator with cubic rigidity to form an energy absorption trap which can absorb vibration energy in a wider frequency band, the friction laminated layer 1 and the base plate 2 form a damping unit which can greatly dissipate the vibration energy transmitted to a combined structure by an affected device (outside), and the vibration absorber realizes larger breakthrough on the traditional vibration absorber design.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A combined laminated friction damping vibration absorber under magnetic constraint is characterized in that: the friction lamination device comprises a friction lamination layer (1), a substrate (2), permanent magnets (3), a fixing groove (4), an arc-shaped substrate (5), steel wires (6) and a mass block (7), wherein a cavity is formed inside the friction lamination layer (1), a plate body of the substrate (2) is embedded into the cavity, a plurality of permanent magnets (3) are fixedly arranged on the surface of the friction lamination layer (1), the arc-shaped substrate (5) is arranged at the head end of the substrate (2), the substrate (2) and the arc-shaped substrate (5) are of an integrated structure, end points at two ends of the arc-shaped substrate (5) are connected through the steel wires (6), and the mass block (7) is fixed in the middle of the steel wires (6); the tail end of the friction lamination (1) is provided with an inwards-recessed fixing groove (4), the friction lamination (1) is of a two-section type and is respectively an inner lamination (1.1) and an outer lamination (1.2), the outer lamination (1.2) is sleeved outside the inner lamination (1.1), the head end of the inner lamination (1.1) extends to the outside of the outer lamination (1.2), and the surfaces of the inner lamination (1.1) and the outer lamination (1.2) are respectively provided with two permanent magnets (3).

2. The magnetically constrained combined laminated friction damped vibration absorber of claim 1 wherein: the fixing groove (4) is a U-shaped groove.

3. The magnetically constrained combined laminated friction damped vibration absorber of claim 1 wherein: the friction lamination (1) and the substrate (2) are positioned in the middle of the arc-shaped substrate (5).