A buckle type adjustable force mechanical superstructure vibration isolator and design method

Abstract

The application provides a buckle type controllable mechanical superstructure vibration isolator and a design method, and the vibration isolator comprises a base plate, a limiting rod and a plurality of vibration isolation cells; the vibration isolation cell comprises a base, a beam oscillator and an elastic connecting piece; the base plate is fixedly connected to one end of the limiting rod; the plurality of vibration isolation cells are sleeved on the limiting rod through the base; the bases of adjacent vibration isolation cells are connected through the elastic connecting pieces; the base of the lowermost vibration isolation cell is connected to the base plate through the elastic connecting piece; a plurality of threaded holes for mounting additional mass blocks are formed in the side of the base, and a connecting hole for mounting the beam oscillator is formed in the side of the base; according to the vibration isolation design requirement, the additional mass blocks and the beam oscillators are mounted at the corresponding positions of the side of the base, and the additional mass blocks are mounted at the distal ends of the corresponding beam oscillators. The application has low structure cost, and the principle structure is relatively simple and efficient compared with the previous control means.

Description

Technical Field

[0001] This invention relates to the field of dynamic vibration isolation mechanical design, specifically to a snap-on adjustable mechanical superstructure vibration isolator and its design method. Background Technology

[0002] In the field of dynamic vibration isolation, the isolation requirements for different objects not only need to meet the design dimensions of the isolator, but also require a high vibration transmissibility. Poorly effective vibration isolation systems can cause significant amplitude and force responses in the isolated object, and in severe cases, vibration damage or even failure. Especially for vibration isolation conditions with high requirements, a wide isolation frequency band and good isolation efficiency within that band are necessary. Adopting reasonable and efficient vibration isolation mechanisms and implementing flexible isolation designs have become key concerns in industries such as aerospace, automotive, shipbuilding, and machining. Based on this background, there is an urgent need for a vibration isolation device that can meet multi-frequency band requirements and achieve good vibration suppression, thereby satisfying the isolation needs of increasingly complex vibration environments.

[0003] In the field of vibration isolator design, vibration isolation control devices with stable and efficient characteristics and intelligent adjustment capabilities have broad application prospects. Utilizing a good and efficient vibration isolation control device can effectively ensure the smooth and effective operation of the vibration isolator. However, in existing vibration isolator design schemes, mature and reliable control methods are still relatively few. Some schemes achieve vibration isolation control by replacing dampers or using active control methods, while others directly achieve vibration isolation design for different objects by adding or removing vibration isolators. However, these schemes all have significant problems:

[0004] Firstly, in the scheme of achieving vibration isolation control through active control, the related supporting equipment is relatively complex, the device is complicated and inefficient, and the design cost of the auxiliary control system is high. Secondly, in the case of achieving vibration isolation control by replacing dampers or adding or removing vibration isolators, there are problems such as poor flexibility, low efficiency and poor adaptability in engineering applications. Moreover, when replacing dampers or adding or removing vibration isolators, the operating space requirements are high, which is often difficult to meet in specific fields such as aerospace. Summary of the Invention

[0005] In order to overcome the problems existing in the prior art, the present invention provides a snap-on adjustable mechanical superstructure vibration isolator and its design method. The device has the advantages of low cost, simple principle and structure, low environmental requirements and good control effect.

[0006] The technical solution of this invention is as follows:

[0007] A snap-on adjustable mechanical superstructure vibration isolator includes a chassis, a limiting rod, and several vibration isolating unit cells;

[0008] The vibration isolation unit cell includes a matrix, a beam oscillator, and elastic connectors;

[0009] The chassis is fixedly connected to one end of the limiting rod; several vibration isolation units are all sleeved on the limiting rod through the base, and the top of the limiting rod does not protrude from the top surface of the uppermost vibration isolation unit base; the bases of adjacent vibration isolation units are connected by elastic connectors, and the base of the lowermost vibration isolation unit is connected to the chassis through elastic connectors.

[0010] The chassis, limiting rod and several vibration isolation units are assembled into a mechanical superstructure vibration isolator and then installed between the object to be isolated and the vibration source. The chassis is fixed on the vibration source and the top surface of the base of the uppermost vibration isolation unit is fixedly connected to the object to be isolated.

[0011] The base has several threaded holes for installing additional mass blocks and connecting holes for installing beam vibrators on its side. The beam vibrator has a threaded hole at its distal end for installing additional mass blocks. According to the vibration isolation design requirements, additional mass blocks and beam vibrators are installed at corresponding positions on the side of the base, and additional mass blocks are installed at the distal ends of the corresponding beam vibrators.

[0012] One end face of the base has a snap-fit ​​plug for connecting with the elastic connector, and the other end face has a snap-fit ​​plug for connecting with the elastic connector or a mounting hole for connecting with the vibration-isolated object; the chassis has a snap-fit ​​plug for connecting with the elastic connector; the elastic connector and the base, as well as the elastic connector and the chassis, are all conveniently connected by snap-fit.

[0013] Furthermore, the substrate adopts a regular octagonal structure, with one set of four cross-shaped sides arranged with connecting holes for mounting the beam vibrator, and another set of four cross-shaped sides arranged with threaded holes for mounting additional mass blocks.

[0014] Furthermore, an inner hollow plug is fixed on the side of the base through the connection hole for installing the beam vibrator. The inner end of the cantilever beam adopts a snap-fit ​​design, which can be inserted into the inner hollow plug fixed on the side of the base to achieve a snap-fit ​​connection.

[0015] Furthermore, the elastic connector adopts a "U"-shaped structure, and locking pins are fixed at both ends of the elastic connector.

[0016] Furthermore, a square hole is opened in the middle of the base, and the limiting rod is a square rod with an arc-shaped plate fixed on its side. The size of the limiting rod and the square hole in the middle of the base are designed for clearance fit, and when the arc-shaped plate contacts the inner wall of the square hole, it is a line contact.

[0017] Furthermore, the bottom of the limiting rod is fixedly connected to the chassis through a reinforcing rib.

[0018] The design method for the above-mentioned vibration isolator includes the following steps:

[0019] Step 1: Determine the number of vibration isolation units based on the longitudinal permissible installation space dimensions of the vibration isolator, as well as the longitudinal dimensions of the vibration isolation unit cell and the chassis thickness; and determine the length of the vibration isolation unit cell beam oscillator based on the transverse permissible installation space dimensions of the vibration isolator.

[0020] Step 2: Based on the required vibration isolation frequency band and the number of vibration isolation unit cells N determined in Step 1, divide the required vibration isolation frequency band into N sub-frequency bands;

[0021] Step 3: For each sub-frequency band, design the corresponding vibration isolation unit cell and determine the matrix equivalent mass and beam oscillator equivalent mass of the vibration isolation unit cell;

[0022] Step 4: Assemble the N vibration isolation unit cells designed in Step 3 into a vibration isolator, establish a vibration isolator model, optimize the vibration isolator model, and obtain the final vibration isolator; the optimization parameters are the equivalent mass of the matrix and the equivalent mass of the beam oscillator, and the optimization target is the vibration transmissibility; the equivalent mass of the matrix and the equivalent mass of the beam oscillator are adjusted by the additional mass blocks installed on them.

[0023] Furthermore, the process of calculating the optimization objective is as follows: perform band structure and vibration characteristic analysis on the vibration isolator model to obtain the bandgap characteristics and frequency response curve of the vibration isolator model; then calculate the vibration transmissibility in the required vibration isolation frequency band based on the bandgap characteristics and frequency response curve.

[0024] Furthermore, the optimization target is to achieve a vibration isolation efficiency of at least 80% for vibration transmission rate.

[0025] Beneficial effects

[0026] The snap-fit ​​adjustable mechanical superstructure vibration isolator designed in this invention can effectively achieve a wide vibration isolation frequency band and a low vibration transmissibility. Its structure is inexpensive, and its principle and structure are simpler and more efficient than previous control methods. This type of vibration isolation device can meet the diverse vibration isolation needs of the isolated object. It features a highly efficient assembly process and good performance. This invention achieves rapid design and control of the vibration isolator through the local resonance mechanism, thereby realizing effective vibration suppression of the vibration isolation system. While ensuring good controllability of the vibration isolation frequency band, it also enhances the mechanical assemblability of the system, enabling rapid assembly according to the requirements of the vibration isolation system, thus reducing product costs. This has a significant impact on the subsequent design of related intelligent vibration isolators. The vibration isolation design method of this invention can effectively expand the design of vibration isolators towards greater intelligence. Its structure is characterized by low cost and wide applicability. This device effectively reduces the control cost of snap-fit ​​adjustment, thereby improving the vibration isolation efficiency of the vibration isolator and contributing to vibration suppression under various working conditions.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a three-dimensional view of the vibration isolation device. Figure I .

[0030] Figure 2 This is a three-dimensional view of the vibration isolation device. Figure II .

[0031] Figure 3 This is a three-dimensional view of a single cell of the vibration isolation device.

[0032] Figure 4 This is a top view of a single cell of the vibration isolation device.

[0033] Figure 5 This is an assembly view of the unit cell of this vibration isolation device, the limiting rod, and the chassis.

[0034] Figure 6 This is a diagram illustrating the design method of this vibration isolation device.

[0035] Figure 7 This is a three-dimensional view of the elastic connector.

[0036] Figure 8 This is a three-dimensional view of the base.

[0037] The components include: 1. Matrix; 2. Beam oscillator; 3. Elastic connector; 4. Limiting rod; 5. Chassis;

[0038] 1-1. Base block; 1-2. First bolt; 1-3. First additional mass block;

[0039] 2-1. Hollow plug; 2-2. Cantilever beam; 2-3. Second bolt; 2-4. Second additional mass block;

[0040] 3-1. Elastic element; 3-2. Buckle; 3-3. Locking pin;

[0041] 4-1. Limiting square rod; 4-2. Curved surface plate; 4-3. Reinforcing rib. Detailed Implementation

[0042] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] This invention proposes a snap-on adjustable mechanical superstructure vibration isolator, which achieves axial vibration isolation of the entire isolator through local resonance of the system. The number of unit cells of the superstructure is determined according to the vibration isolation size requirements of the object being isolated, and then the vibration transmission rate requirement of the preset vibration isolation is achieved by adjusting the oscillator and the additional mass of the matrix.

[0046] As shown in the figure, the snap-on adjustable mechanical superstructure vibration isolator in this embodiment includes a chassis, a limiting rod, and several vibration isolation unit cells.

[0047] The vibration isolation unit cell includes a matrix, a beam oscillator, and an elastic connector.

[0048] The chassis is fixedly connected to one end of the limiting rod; several vibration isolation units are all fitted onto the limiting rod through the base, and the top of the limiting rod does not protrude from the top surface of the base of the uppermost vibration isolation unit; the bases of adjacent vibration isolation units are connected by elastic connectors, and the base of the lowermost vibration isolation unit is connected to the chassis through elastic connectors.

[0049] The chassis, limiting rod, and several vibration isolation units are assembled into a mechanical superstructure vibration isolator and then installed between the object to be isolated and the vibration source. The chassis is fixed to the vibration source, and the top surface of the base of the uppermost vibration isolation unit is fixedly connected to the object to be isolated.

[0050] The base has several threaded holes on its side for installing additional mass blocks and connecting holes for installing beam vibrators. The beam vibrator has a threaded hole at its distal end for installing additional mass blocks. According to the vibration isolation design requirements, additional mass blocks and beam vibrators are installed at corresponding positions on the base, and additional mass blocks are installed at the distal ends of the corresponding beam vibrators.

[0051] One end face of the base has a snap-fit ​​plug for connecting with the elastic connector, and the other end face has a snap-fit ​​plug for connecting with the elastic connector or a mounting hole for connecting with the vibration-isolated object; the chassis has a snap-fit ​​plug for connecting with the elastic connector; the elastic connector and the base, as well as the elastic connector and the chassis, are all conveniently connected by snap-fit.

[0052] In this embodiment, the base adopts a regular octagonal structure. One set of four sides, arranged in a cross shape, has connection holes for mounting the beam vibrator, while another set of four sides, also arranged in a cross shape, has threaded holes for mounting additional mass blocks. An internal plug is fixed to the side of the base through the connection holes for mounting the beam vibrator. The inner end of the cantilever beam uses a snap-fit ​​mechanism, allowing for quick and easy insertion into the fixed internal plug on the side of the base, achieving a snap-fit ​​connection. A first additional mass block is fixed to the threaded holes on the side of the base using a first bolt, thus facilitating the adjustment of the equivalent mass of the base. Threaded holes are also provided at the outer end of the cantilever beam, allowing a second additional mass block to be fixed to it using a second bolt according to design requirements, thereby facilitating the adjustment of the equivalent mass of the beam vibrator.

[0053] In this embodiment, the elastic connector adopts a "U"-shaped structure, and locking pins are fixed at both ends of the elastic connector. The locking pins on the elastic connector can be quickly connected to the base end face and the buckle plug on the chassis.

[0054] The base has a square hole in its center for mounting the base onto the limiting rod, allowing it to slide axially relative to the limiting rod. The limiting rod is a square rod, and its dimensions are designed for a clearance fit with the square hole in the base. To reduce friction, an arc-shaped plate is fixed to the side of the square rod, and when the arc-shaped plate contacts the inner wall of the square hole, it is in line contact, further reducing friction. A reinforcing rib is machined at one end of the limiting rod, and the reinforcing rib securely connects the rod to the chassis.

[0055] Based on the above structure, and considering the actual object being isolated and its installation environment, the following design method for a snap-on adjustable mechanical superstructure vibration isolator is presented to determine the number of unit cells and the parameters of each unit cell to meet the requirements of a wide vibration isolation frequency band. The specific steps are as follows:

[0056] Step 1: Determine the number and size of the vibration isolation unit cells.

[0057] Since the installation environment of vibration isolators is limited, and the required vibration isolation frequency band is relatively wide, in order to achieve wide-band vibration isolation in a limited space environment, the number and size of the vibration isolation unit cells must first be determined according to the size constraints of the space environment.

[0058] Based on the structure of the vibration isolator described above, it is known that the isolator consists of multiple unit cells arranged longitudinally and connected by snap-fit ​​connections, and is installed as a whole on the chassis. Therefore, the longitudinal dimension of the vibration isolator is the sum of the longitudinal dimensions of the multiple unit cells and the chassis thickness. Thus, the number of vibration isolator unit cells N can be determined based on the permissible longitudinal installation space of the vibration isolator, as well as the longitudinal dimensions of the vibration isolator unit cells and the chassis thickness. The lateral dimension of the vibration isolator mainly considers the length of the beam oscillator. Therefore, the length of the beam oscillator in the vibration isolator unit cell is determined based on the permissible lateral installation space of the vibration isolator.

[0059] Step 2: Based on the required vibration isolation frequency band and the number of vibration isolation unit cells N determined in Step 1, divide the required vibration isolation frequency band into N sub-bands; each sub-band corresponds to one vibration isolation unit cell.

[0060] Step 3: For each sub-frequency band, design the corresponding vibration isolation unit cell and determine the matrix equivalent mass and beam oscillator equivalent mass of the vibration isolation unit cell. The matrix equivalent mass and beam oscillator equivalent mass obtained here will be used as the initial parameters of each vibration isolation unit cell in the subsequent overall design of the vibration isolator.

[0061] When designing a vibration isolation unit cell, the longitudinal dimension of the unit cell and the length of the beam oscillator remain unchanged. Instead, the equivalent mass of the base and the equivalent mass of the beam oscillator are adjusted by changing the additional mass blocks installed on them.

[0062] Step 4: Assemble the N vibration isolation unit cells designed in Step 3 into a vibration isolator, establish a vibration isolator model, optimize the vibration isolator model, and obtain the final vibration isolator; the optimization parameters are the matrix equivalent mass and beam oscillator equivalent mass of each vibration isolation unit cell, and the optimization objective is the vibration transmissibility; the matrix equivalent mass and beam oscillator equivalent mass are adjusted by the additional mass blocks installed on them.

[0063] The optimization process involves: analyzing the bandgap structure and vibration characteristics of the isolator model to obtain its bandgap characteristics and frequency response curves; then calculating the vibration transmissibility within the required isolation frequency band based on these characteristics and curves. The vibration transmissibility must reach at least 80% of the isolation efficiency. If this is achieved, the design requirements for the mechanical superstructure isolator are met, and the entire isolator design is complete. If not, the added mass of the oscillator and matrix in the unit cell design is readjusted until the desired result is achieved.

[0064] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A design method for a snap-on adjustable mechanical superstructure vibration isolator, characterized in that: The vibration isolator includes a chassis, a limiting rod and a number of vibration isolation single cells; The vibration isolation single cell includes a matrix, a beam oscillator and an elastic connecting member; One end of the limiting rod is fixedly connected to the chassis; a number of vibration isolation single cells are all sleeved on the limiting rod through the matrix, and the top of the limiting rod does not protrude above the top surface of the matrix of the uppermost vibration isolation single cell, and the matrix can axially slide relative to the limiting rod; between the matrices of adjacent vibration isolation single cells, they are connected by an elastic connecting member, and the matrix of the lowermost vibration isolation single cell is connected to the chassis by an elastic connecting member; After the chassis, the limiting rod and a number of vibration isolation single cells are assembled into a mechanical superstructure vibration isolator, it is installed between the vibration-isolated object and the vibration source, wherein the chassis is fixed on the vibration source, and the top surface of the matrix of the uppermost vibration isolation single cell is fixedly connected to the vibration-isolated object; The side surface of the matrix is provided with a number of threaded holes for installing additional mass blocks and connecting holes for installing beam oscillators, and the distal end of the beam oscillator is provided with threaded holes for installing additional mass blocks; according to the vibration isolation design requirements, additional mass blocks and beam oscillators are installed at the corresponding positions on the side surface of the matrix, and additional mass blocks are installed at the distal ends of the corresponding beam oscillators; One end surface of the matrix has a snap plug for connecting with the elastic connecting member, and the other end surface has a snap plug for connecting with the elastic connecting member or a mounting hole for connecting with the vibration-isolated object; the chassis has a snap plug for connecting with the elastic connecting member; the elastic connecting member is connected to the matrix and the elastic connecting member is connected to the chassis, both are realized by a snap connection for convenient connection; The design method includes the following steps: Step 1: Determine the number of vibration isolation single cells according to the longitudinal allowable installation space dimension of the vibration isolator, the longitudinal dimension of the vibration isolation single cell and the thickness of the chassis; and determine the length of the beam oscillator of the vibration isolation single cell according to the transverse allowable installation space dimension of the vibration isolator; Step 2: Divide the required vibration isolation frequency band into N sub-frequency bands according to the required vibration isolation frequency band and the number N of vibration isolation single cells determined in Step 1; Step 3: For each sub-frequency band, perform corresponding vibration isolation single cell design respectively, and determine the equivalent mass of the matrix and the equivalent mass of the beam oscillator of the vibration isolation single cell; Step 4: Assemble the N vibration isolation single cells designed in Step 3 into a vibration isolator, establish a vibration isolator model, and perform an optimization design on the vibration isolator model to obtain the final vibration isolator; wherein the optimization parameters are the equivalent mass of the matrix and the equivalent mass of the beam oscillator, and the optimization goal is the vibration transmission ratio; and the equivalent mass of the matrix and the equivalent mass of the beam oscillator are adjusted by the additional mass blocks installed on them.

2. The design method of a snap-on adjustable mechanical superstructure vibration isolator according to claim 1, characterized in that: The matrix adopts a regular octagon structure, and four side surfaces distributed in a cross shape in one group are provided with connecting holes for installing beam oscillators, and four side surfaces distributed in a cross shape in the other group are provided with threaded holes for installing additional mass blocks.

3. The design method of a snap-on adjustable mechanical superstructure vibration isolator according to claim 1, characterized in that: An inner hollow plug is fixed on the side surface of the matrix through the connecting hole for installing the beam oscillator, and the inner end of the cantilever beam adopts a pin form and can be inserted into the inner hollow plug fixed on the side surface of the matrix to realize a snap connection.

4. The design method of a snap-on adjustable mechanical superstructure vibration isolator according to claim 1, characterized in that: The elastic connecting member adopts a "zigzag" structure, and pins are fixed at both ends of the elastic connecting member.

5. The design method of a snap-on adjustable mechanical superstructure vibration isolator according to claim 1, characterized in that: A square hole is opened in the middle of the matrix, the limiting rod adopts a square rod, and an arc-shaped piece is fixed on the side surface of the square rod; the dimensions of the square rod of the limiting rod and the square hole in the middle of the matrix are designed as a clearance fit design, and when the arc-shaped piece contacts the inner wall of the square hole, it is a line contact.

6. The design method of a snap-on adjustable mechanical superstructure vibration isolator according to claim 1, characterized in that: The bottom of the limiting rod is fixedly connected to the chassis through a reinforcing rib.

7. The design method of a snap-fit ​​adjustable mechanical superstructure vibration isolator according to claim 1, characterized in that: The process of calculating the optimization objective is as follows: perform band structure and vibration characteristic analysis on the vibration isolator model to obtain the bandgap characteristics and frequency response curve of the vibration isolator model; then calculate the vibration transmissibility in the required vibration isolation frequency band based on the bandgap characteristics and frequency response curve.

8. The design method of a snap-on adjustable mechanical superstructure vibration isolator according to claim 7, characterized in that: The optimization goal is to achieve a vibration isolation efficiency of at least 80% for vibration transmission rate.

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