CN114233782A

CN114233782A - Novel self-adaptive broadband dynamic vibration absorber

Info

Publication number: CN114233782A
Application number: CN202111411328.9A
Authority: CN
Inventors: 王志; 闫庚尧; 孙丹; 张凤玲; 田晶; 艾延廷
Original assignee: Shenyang Aerospace University
Current assignee: Shenyang Aerospace University
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-03-25

Abstract

The invention discloses a novel adaptive broadband dynamic vibration absorber, comprising: a stepping motor, a sliding block, a lead screw, an adjustable length cantilever beam, a supporting frame, a gantry, a mass block, a chassis, a base, an adapter, and a connecting block ; A stepping motor is fixed on one side of the chassis, and a base perpendicular to the chassis is fixed on the other side; a supporting frame is fixed between the stepping motor and the base along the vertical direction on both sides of the chassis; one end of the lead screw is connected to the step into the motor, and the other end is fixed on the base; the slider is threaded on the lead screw; a connection block is arranged above the slider; the upper part of the connection block is fixed with one end of the adapter; the other end of the adapter is fixed at the adjustable length One end of the cantilever beam; a mass block is fixed under the other end of the adjustable-length cantilever beam; the adjustable-length cantilever beam passes through the gantry fixed on the base. The invention has simple and reliable structure, can effectively adjust the natural frequency of the vibration absorber, has high control precision and good stability, and has great engineering application value.

Description

Novel self-adaptive broadband dynamic vibration absorber

Technical Field

The invention relates to the field of vibration reduction, in particular to a novel self-adaptive broadband dynamic vibration absorber.

Background

Dynamic vibration absorbers have been widely used in many fields since 1911 as a simple and effective vibration-damping device. When the natural frequency of the traditional dynamic vibration absorber is the same as the frequency of the external excitation force, the vibration of a main system can be obviously reduced, and the traditional dynamic vibration absorber has the characteristics of simple structure, reliability, high efficiency and the like, and is widely applied to structural vibration reduction and noise reduction engineering. However, when the frequency of the external excitation force is deviated, the conventional dynamic vibration absorber is in a detuned state, and the vibration reduction effect is sharply reduced. Therefore, it is necessary to develop a broadband dynamic vibration absorber capable of adaptively adjusting the self-structure parameters according to the external excitation frequency change.

Disclosure of Invention

The invention aims to provide a novel self-adaptive broadband dynamic vibration absorber to solve the problem that when the frequency of external excitation force of a traditional dynamic vibration absorber deviates, the traditional dynamic vibration absorber is in a detuning state, and the vibration reduction effect is sharply reduced.

The invention provides a novel self-adaptive broadband dynamic vibration absorber, which comprises: the device comprises a stepping motor, a sliding block, a lead screw, a cantilever beam with adjustable length, a supporting frame, a gantry, a mass block, a chassis, a base, a connector and a connecting block;

a stepping motor is fixed on one side of the base plate, and a base vertical to the base plate is arranged on the other side of the base plate; a supporting frame is arranged between the stepping motor and the base along the vertical direction of two sides of the chassis; one end of the lead screw is connected to the stepping motor, and the other end of the lead screw is arranged on the base through a bearing; the sliding block penetrates through the lead screw; a connecting block is arranged above the sliding block; the upper part of the connecting block is fixed with one end of the adapter; the other end of the adapter is fixed at one end of the cantilever beam with adjustable length; a mass block is fixed below the other end of the length-adjustable cantilever beam; the length-adjustable cantilever beam penetrates through a gantry fixed on the base.

Further, the stepper motor control hub utilizes fuzzy control.

Further, the cantilever beam with the adjustable length is a rectangular long iron strip.

Further, the connecting block is a T-shaped iron block.

Further, the height of the top of the sliding block is smaller than that of the top of the supporting frame, and the height of the top of the connecting block is larger than that of the top of the supporting frame.

The invention has the following beneficial effects: the invention provides a novel self-adaptive broadband dynamic vibration absorber, which adopts a cantilever beam type structure with an adjustable cantilever length driven by a stepping motor, has a simple and reliable structure and can effectively adjust the natural frequency of the vibration absorber; on the other hand, the fuzzy control algorithm is applied to the natural frequency control of the broadband dynamic vibration absorber, and the control precision is high; in addition, the vibration absorption frequency band is wide, the vibration absorption effect is better than that of the traditional vibration absorber, and the vibration absorber has the advantages of simple structure, good stability and larger engineering application value.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a novel adaptive broadband dynamic vibration absorber according to the present invention;

illustration of the drawings: 1-a step motor; 2-a slide block; 3-a lead screw; 4-cantilever beam with adjustable length; 5-supporting the frame; 6-gantry; 7-a mass block; 8-a chassis; 9-a base; 10-an adaptor; 11-connecting block.

Detailed Description

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 invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

Referring to fig. 1, the present invention provides a novel adaptive broadband dynamic vibration absorber, including: the device comprises a stepping motor 1, a sliding block 2, a lead screw 3, a length-adjustable cantilever beam 4, a supporting frame 5, a gantry 6, a mass block 7, a chassis 8, a base 9, an adapter 10 and a connecting block 11;

a stepping motor 1 is fixed on one side of the base plate 8, and a base 9 vertical to the base plate 8 is arranged on the other side of the base plate 8; a supporting frame 5 is fixed between the stepping motor 1 and the base 9 along the vertical direction of two sides of the chassis 8 through bolts; one end of the screw rod 3 is connected to the stepping motor 1, and the other end of the screw rod is fixed on the base 9 through a bearing; the sliding block 2 penetrates through the screw rod 3; a connecting block 11 is arranged above the sliding block 2; an adapter 10 is fixed above the connecting block 11 through a bolt; the other end of the adapter piece 10 is fixed at one end of the length-adjustable cantilever beam 4 through a bolt; a mass block 7 is fixed below the other end of the length-adjustable cantilever beam 4; the cantilever beam 4 with adjustable length passes through a gantry 6 fixed on a base 9.

In the embodiment, the control center of the stepping motor 1 utilizes fuzzy control, and a fuzzy control algorithm is applied to the control of the natural frequency of the broadband dynamic vibration absorber, so that the control precision is high.

In this embodiment, the cantilever beam 4 with adjustable length is a rectangular long iron bar.

In this embodiment, the connecting block 11 is a T-shaped iron block.

In this embodiment, the height of the top of the slider 2 is less than the height of the top of the supporting frame 5, and the height of the top of the connecting block 11 is greater than the height of the top of the supporting frame 5.

The working principle of the novel self-adaptive broadband dynamic vibration absorber provided by the invention is as follows:

the stepping motor 1 is controlled to drive the lead screw 3 to rotate, so that the slide block 2 is driven to move, the cantilever length of the cantilever beam 4 with the adjustable length is adjusted, the effect of changing the bending rigidity of the system of the cantilever beam 4 with the adjustable length is achieved, and the purpose of changing the natural frequency of the dynamic vibration absorber is achieved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel adaptive broadband dynamic vibration absorber, characterized in that it comprises: a stepping motor (1), a slider (2), a lead screw (3), an adjustable-length cantilever beam (4), a supporting frame (5) ), gantry (6), mass block (7), chassis (8), base (9), adapter (10), connecting block (11);

One side of the chassis (8) is fixed with a stepping motor (1), and the other side is provided with a base (9) perpendicular to the chassis (8); A support frame (5) is arranged between the two sides of the chassis (8) in the vertical direction; one end of the lead screw (3) is connected to the stepping motor (1), and the other end is mounted on the base (9) through a bearing the sliding block (2) is worn on the lead screw (3); a connecting block (11) is arranged above the sliding block (2); the upper part of the connecting block (11) is fixed with one end of the adapter (10) ; the other end of the adapter (10) is fixed at one end of the adjustable-length cantilever beam (4); a mass block (7) is fixed below the other end of the adjustable-length cantilever beam (4); The length-adjustable cantilever beam (4) passes through the gantry (6) fixed on the base (9).

2 . The novel adaptive broadband dynamic vibration absorber according to claim 1 , wherein the control center of the stepping motor ( 1 ) uses fuzzy control. 3 .

3 . The novel adaptive broadband dynamic vibration absorber according to claim 1 , wherein the adjustable length cantilever beam ( 4 ) is a rectangular long iron bar. 4 .

4 . The novel adaptive broadband dynamic vibration absorber according to claim 3 , wherein the connecting block ( 11 ) is a T-shaped iron block. 5 .

5. A novel adaptive broadband dynamic vibration absorber according to claim 4, characterized in that the height of the top of the slider (2) is less than the height of the top of the support frame (5), and the connection block ( 11) The height of the top is greater than the height of the top of the support frame (5).