A multi-line spectrum wave isolator and design method thereof

Abstract

The present invention relates to a multi-line spectrum wave blocking vibration isolator and a design method, wherein the multi-line spectrum wave blocking vibration isolator comprises: a vibration isolation support (1) and a local resonance structure (2); the vibration isolation support (1) is provided with a plurality of vibration isolation supports around the local resonance structure (2); the vibration isolation support (1) and the local resonance structure (2) are both made of metal; the vibration isolation support (1) comprises: two symmetrical and spaced vibration isolation support parts (11); one end of the vibration isolation support part (11) is a fixed end connected to the local resonance structure (2), and the other end is a support end away from the local resonance structure (2); the support ends of the two vibration isolation support parts (11) are protruded in directions away from each other. The vibration isolator of the present invention has a local resonance vibration isolation characteristic, wherein the resonance of the local resonance structure is confined to the entire vibration isolator and will not be transmitted to the vibration isolation object, thereby effectively ensuring the vibration isolation performance of the present invention.

Description

Technical Field

[0001] The invention relates to the field of vibration control, and in particular to a multi-line spectrum wave damping vibration isolator and a design method thereof. Background Art

[0002] Under conditions such as small installation space, mass constraints and high temperature resistance, traditional vibration isolators are difficult to meet vibration isolation requirements. Anti-resonance vibration isolators have the technical characteristics of both vibration absorption and vibration isolation, and can achieve higher vibration isolation efficiency near certain specific frequencies, so they can be used for line spectrum vibration isolation. Traditional dynamic anti-resonance vibration isolators work on the isolated equipment / weight through inertial elements. The bandwidth currently achieved is very narrow, the efficiency is low, the structure is complex, and usually a single vibration isolator has only a single narrow-band line spectrum band. It is necessary to install multiple inertial elements of different frequencies to form multiple vibration isolation valleys, which will lead to problems such as increased mass of the vibration isolator, complex structure and installation, and not conducive to installation in small spaces. Secondly, compared with single-degree-of-freedom vibration isolators with the same stiffness, traditional anti-resonance vibration isolators will weaken the vibration isolation effect of medium and high frequencies, which is not conducive to broadband vibration isolation. In addition, the line spectrum isolation effect of traditional anti-resonance vibration isolators decays with the increase of damping, and the actual vibration isolators must have a certain damping in order to suppress the resonance peak, resulting in poor isolation effect of this type of vibration isolators. For example, Chinese patent CN110469625A discloses a hydraulic anti-resonance vibration isolator with air spring frequency modulation, which includes a first end cover, an isolation membrane, an outer cylinder, a vibration isolation spring, an inner cylinder, and a second end cover; one end of the inner cylinder extends into the outer cylinder, the other end of the inner cylinder is interlocked with the second end cover, and the end of the outer cylinder away from the second end cover is interlocked with the first end cover; after the vibration isolation spring is respectively connected with the outer wall of the inner cylinder and the inner wall of the outer cylinder, a sealed cavity structure is formed by the first end cover, the outer cylinder, the vibration isolation spring, the inner cylinder and the second end cover; the isolation membrane is connected to the inside of the first end cover to form a sealed elastic cavity. The hydraulic anti-resonance vibration isolator can well block the transmission of constant frequency vibration excitation to the isolated object, and has a high vibration isolation efficiency near the vibration isolation frequency. However, the hydraulic anti-resonance vibration isolator also faces the aforementioned problems of large mass, large volume, and complex structure by adding other structures. Summary of the invention

[0003] The object of the present invention is to provide a multi-line spectrum wave blocking vibration isolator and a design method thereof.

[0004] To achieve the above-mentioned invention object, the present invention provides a multi-line spectrum wave blocking vibration isolator, comprising: a vibration isolation support and a local resonance structure;

[0005] The vibration isolation supports are arranged in plurality around the local resonance structure;

[0006] The vibration isolation support and the local resonance structure are both made of metal;

[0007] The vibration isolation support comprises: two vibration isolation support parts which are symmetrical and spaced apart;

[0008] One end of the vibration isolation support portion is a fixed end connected to the local resonance structure, and the other end is a support end away from the local resonance structure;

[0009] The support ends of the two vibration isolation support parts are protruded in directions away from each other, wherein one vibration isolation support part is connected to the vibration isolation object through the support end, and the other vibration isolation support part is connected to the base through the support end.

[0010] According to one aspect of the present invention, the vibration isolation support portion comprises: a support body in the form of an elongated plate and a protruding structure;

[0011] One end of the support body is fixedly connected to the protruding structure, and the other end forms a fixed end of the vibration isolation support portion, which is used to connect to the local resonance structure;

[0012] The protruding structure forms a supporting end of the vibration isolation support portion, which includes: a connecting member and a supporting member;

[0013] The supporting body and the supporting member are located on opposite sides of the connecting member, wherein one end of the connecting member is vertically connected to one end of the supporting body, and the other end of the connecting member is vertically connected to the supporting member;

[0014] According to one aspect of the present invention, the two vibration isolation support parts in the vibration isolation support are independent of each other, or the fixed ends of the two vibration isolation support parts are connected to each other.

[0015] According to one aspect of the present invention, the multi-order resonance modes of the local resonance structure are used to provide multiple local resonance states, wherein the multi-order resonance modes correspond to multiple anti-resonance valleys of the vibration isolation curve of the multi-line spectrum wave damping vibration isolator.

[0016] According to one aspect of the present invention, the local resonance frequency of the local resonance structure is adjusted to a plurality of excitation input frequencies respectively according to different structural design parameters of the local resonance structure, so as to obtain the multi-order local resonance modes and the anti-resonance valley value;

[0017] The structural design parameters include at least one of thickness, mass, stiffness, mass distribution, and material parameters.

[0018] According to one aspect of the present invention, in order to reduce the structural weight and adjust the local resonance frequency, the optimized local resonance structure is a frame structure, which includes: a cross beam and a longitudinal beam fixedly connected to each other;

[0019] There are a plurality of the cross beams arranged in parallel, and a plurality of the longitudinal beams arranged in parallel;

[0020] The cross beam and the longitudinal beam are integrated.

[0021] According to one aspect of the present invention, the crossbeam is provided with a hollow structure for reducing weight and adjusting frequency;

[0022] Along the length direction of the cross beam, the hollow structure is located between the positions where the cross beam is connected to the longitudinal beam, and the axial direction of the hollow structure is parallel to the length direction of the longitudinal beam.

[0023] According to one aspect of the present invention, the vibration isolation support and the local resonance structure are connected by welding or are integrally formed.

[0024] The vibration isolation support and the local resonance structure are both made of stainless steel, titanium alloy or aluminum alloy.

[0025] In order to achieve the above-mentioned object of the invention, the present invention provides a design method for the aforementioned multi-line spectrum wave blocking vibration isolator, comprising:

[0026] S1. Determine the weight M of the vibration isolation object carried;

[0027] S2. Determine the vibration isolation support structure, quantity and distribution position for connecting the vibration isolation object and the base based on the installation and positioning structure of the vibration isolation object; wherein the vibration isolation support comprises: two vibration isolation support parts that are symmetrical and spaced apart;

[0028] One end of the vibration isolation support portion is a fixed end connected to the local resonance structure, and the other end is a support end away from the local resonance structure;

[0029] The support ends of the two vibration isolation support parts are protruded in directions away from each other, wherein one of the vibration isolation support parts is connected to the vibration isolation object through the support end, and the other vibration isolation support part is connected to the base through the support end;

[0030] S3. Assume that the multi-line spectrum wave damping vibration isolator is a node of mass m, and attach a local resonance structure at the node for connecting the vibration isolation support and for changing the vibration energy transmission channel, wherein the local resonance frequency of the local resonance structure is:

[0031] f r =√(k r / m r ) / 2 / π

[0032] Among them, m <M / 10,m r is the mass of the local resonance structure, k r is the stiffness of the local resonance structure.

[0033] According to one aspect of the present invention, the mass m of the local resonance structure is r The weight M of the vibration isolation object satisfies: m r / M<10%.

[0034] According to one solution of the present invention, the vibration isolator of the present invention has wave-blocking vibration isolation characteristics, wherein the resonance of the local resonance structure is confined in the entire vibration isolator, forming an anti-resonance valley on the vibration transmissibility curve, achieving line spectrum isolation while ensuring broadband isolation effect.

[0035] According to one scheme of the present invention, the vibration isolator of the present invention can realize low-frequency multi-line spectrum broadband vibration isolation; wherein, the line spectrum vibration isolation is realized by utilizing the resonance of the local resonance structure, and the resonance of the local resonance structure is confined to the entire vibration isolator and will not be transmitted to the main mass block. The multi-order resonance modes of the local resonance structure correspond to multiple anti-resonance attenuation valleys of the transmission rate, and the low-order mode frequency is relatively low. In addition, by changing the design method of the local resonance structure (changing at least one of the thickness, mass, stiffness, mass distribution method, and material parameters), different local resonance frequencies can be adjusted to multiple excitation input frequencies respectively to realize low-frequency multi-line spectrum broadband vibration isolation.

[0036] According to one solution of the present invention, the structure is designed to be integrated, the mass and rigidity of the vibration isolator itself are utilized, and the additional mass is small.

[0037] According to one solution of the present invention, the vibration isolator of the present invention uses the mass and stiffness of the vibration isolator itself through an integrated design, does not need to add an additional spring / rubber structure, has a small additional mass, is easy to install, and occupies a small space.

[0038] According to one solution of the present invention, the present invention couples the mass of the vibration isolator to the local resonance structure design, and realizes a lower frequency vibration isolator with multiple vibration isolation valleys with a smaller additional mass.

[0039] According to one solution of the present invention, the vibration isolator of the present invention can be prepared by using a pure metal structure, and is resistant to high temperatures and corrosion, and has high reliability and adaptability.

[0040] According to one solution of the present invention, the vibration transfer curve of the vibration isolator of the present invention forms an anti-resonant vibration isolation valley near the local resonance frequency, which can be used to isolate broadband vibrations and also can efficiently isolate line spectrum vibrations without changing the bearing stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The structure of a multi-line spectrum wave isolator according to an embodiment of the present invention is schematically shown;

[0042] Figure 2Schematically showing a multi-order resonance mode diagram of a multi-line spectrum wave damping vibration isolator according to an embodiment of the present invention;

[0043] Figure 3 A simplified discrete dynamic model diagram schematically showing the wave damping vibration isolator according to the present invention;

[0044] Figure 4 A typical vibration transmissibility graph schematically showing a wave damping vibration isolator according to the present invention;

[0045] Figure 5 A diagram schematically showing a simulation model of a multi-line spectrum wave damping vibration isolator and a vibration isolation object according to Embodiment 1 of the present invention;

[0046] Figure 6 Schematic representation Figure 5 Displacement transmissibility curve of the simulation model;

[0047] Figure 7 A schematic diagram showing a physical sample of a multi-line spectrum wave isolator according to Embodiment 2 of the present invention;

[0048] Figure 8 Schematic representation based on Figure 7 Diagram of the experimental test system constructed with physical samples;

[0049] Fig. 9 Schematic representation Figure 8 The power spectrum density function diagram of random vibration acceleration of the experimental test system;

[0050] Fig.10 Schematic representation Figure 8 Figure 2. Test results of the experimental test system. DETAILED DESCRIPTION

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0052] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0053] like Figure 1 As shown, according to one embodiment of the present invention, a multi-line spectrum wave-blocking vibration isolator of the present invention comprises: a vibration isolation support 1 and a local resonance structure 2. In this embodiment, a plurality of vibration isolation supports 1 are arranged around the local resonance structure 2. For example, four vibration isolation supports 1 are arranged around the local resonance structure 2 to achieve four-point support for the vibration isolation object. In this embodiment, the vibration isolation support 1 is connected to the side of the local resonance structure 2 so that the vibration isolation support 1 and the local resonance structure 2 are basically in the same plane, which effectively reduces the overall height of the vibration isolator and realizes the flexible installation of the present invention in a small space. In this embodiment, the vibration isolation support 1 and the local resonance structure 2 are both made of metal.

[0054] In this embodiment, the vibration isolation support 1 is used to realize the connection support for the vibration isolation object, which directly affects the dynamic stiffness and vibration isolation frequency of the entire vibration isolator. In this embodiment, the vibration isolation support 1 includes: two symmetrical and spaced vibration isolation support parts 11; wherein the two vibration isolation support parts 11 are relatively arranged with an upper and lower interval along the thickness direction of the local resonance structure 2. In this embodiment, one end of the vibration isolation support part 11 is a fixed end connected to the local resonance structure 2, and the other end is a support end away from the local resonance structure 2; wherein the support ends of the two vibration isolation support parts 11 are protruding in directions away from each other. In this embodiment, one of the two vibration isolation support parts 11 is connected to the vibration isolation object through the support end, and the other is connected to the base through the support end. wherein the support end of the vibration isolation support part 11 can be connected to the vibration isolation object and the base by means of threaded connectors, welding, gluing, etc.

[0055] like Figure 1 As shown, according to one embodiment of the present invention, the vibration isolation support part 11 includes: a support body 111 in the shape of an elongated plate and a protruding structure 112. In this embodiment, one end of the support body 111 is fixedly connected to the protruding structure 112, and the other end forms a fixed end of the vibration isolation support part 11, which is used to connect the local resonance structure 2. In this embodiment, the protruding structure 112 forms the support end of the vibration isolation support part 11, which includes: a connecting member 112a and a supporting member 112b; wherein the connecting member 112a and the supporting member 112b are respectively in the shape of an elongated plate. The support body 111 and the supporting member 112b are located on opposite sides of the connecting member 112a, wherein one end of the connecting member 112a is vertically connected to one end of the support body 111, and the other end thereof is vertically connected to the supporting member 112b.

[0056] like Figure 1As shown, according to one embodiment of the present invention, the two vibration isolation support parts 11 in the vibration isolation support 1 are independent of each other. Through the above arrangement, the integrated arrangement of the vibration isolation support 1 and the local resonance structure 2 can be conveniently realized, which is convenient for processing and has a stable and firm structure. Alternatively, the fixed ends of the two vibration isolation support parts 11 are interconnected. Through the above arrangement, the vibration isolation support 1 can be welded to the local resonance structure 2 after being processed separately, which effectively ensures the structural accuracy and structural stability of the vibration isolation support 1.

[0057] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the multi-order resonance modes of the local resonance structure 2 are used to provide multiple local resonance states, wherein the multi-order resonance modes correspond to multiple anti-resonance valleys of the vibration isolation curve of the multi-line spectrum wave-damping vibration isolator. In this embodiment, the attenuation valley of the vibration isolation displacement transmission rate of the vibration isolator depends on the resonance mode of the local resonance structure 2 in the vibration isolator, and can be applicable to vibration isolation applications of different structures. In this embodiment, by changing the structural design parameters of the local resonance structure (at least one of thickness, mass, stiffness, mass distribution mode, and material), different local resonance frequencies can be adjusted to multiple excitation input frequencies respectively, so as to obtain corresponding multi-order resonance modes, and the low-frequency multi-line spectrum broadband vibration isolation of the present invention can be effectively realized.

[0058] like Figure 1 As shown, according to one embodiment of the present invention, the local resonance structure 2 is a frame structure, which includes: a cross beam 21 and a longitudinal beam 22 fixedly connected to each other. In this embodiment, a plurality of cross beams 21 are arranged in parallel, a plurality of longitudinal beams 22 are arranged in parallel, and the cross beams 21 and the longitudinal beams 22 are integrated.

[0059] like Figure 1 As shown, according to an embodiment of the present invention, a hollow structure 211 for reducing weight and adjusting frequency is provided on the cross beam 21. In this embodiment, along the length direction of the cross beam 21, the hollow structure 211 is located between the positions where the cross beam 21 and the longitudinal beam 22 are connected, and the axial direction of the hollow structure 211 is parallel to the length direction of the longitudinal beam 22.

[0060] According to one embodiment of the present invention, the vibration isolation support 1 and the local resonance structure 2 are connected by welding or integrally formed. Through the above arrangement, the vibration isolation support and the local resonance structure are integrated into one design, and the mass and stiffness of the vibration isolator itself are utilized, and no additional spring / rubber structure is required, so the additional mass is small, the installation is simple, and the space occupied is small.

[0061] According to one embodiment of the present invention, the vibration isolation support 1 and the local resonance structure 2 can be made of metal materials such as stainless steel, titanium alloy or aluminum alloy. Through the above configuration, the vibration isolation support 1 and the local resonance structure 2 are set as pure metal structures, which are resistant to high temperature and corrosion, and have high reliability and adaptability. Of course, in other embodiments, the vibration isolation support and the local resonance can also be made of materials such as nylon plastic.

[0062] like Figure 1 As shown, according to one embodiment of the present invention, the external dimensions of the multi-line spectrum wave-blocking vibration isolator of the present invention are determined according to the installation space limitation (for example, the height limitation is 30 mm) and the installation hole spacing of the vibration isolation support. In this embodiment, the vibration isolator is connected to the vibration isolation object through the support end of the vibration isolation support 1. The vibration mode of the vibration isolator of the present invention is simulated by simulation software, and the mode in which the vibration is confined to the local resonance structure is selected, such as Figure 2 As shown, at this time, the vibration and energy will not be transmitted to the vibration isolation object along the support ends of the four vibration isolation supports 1 of the vibration isolator. Figure 2 The first-order resonant mode shown in (a) has the lowest frequency and is helpful for achieving low-frequency vibration isolation. Figure 2 The mode shown in (b) utilizes the resonance of the mass of the entire isolator, so the local resonance peak bandwidth of the displacement transmissibility is the widest, and this mode frequency can be adjusted to the main excitation input frequency. In addition, there are multiple isolator modes that can produce local resonance states (see Figure 2 (c) and 2(d)) for multi-line spectrum broadband vibration isolation.

[0063] like Figure 3 and Figure 4 As shown, according to one embodiment of the present invention, the present invention also proposes a design method for the aforementioned multi-line spectrum wave isolator, comprising:

[0064] S1. Determine the weight M of the vibration isolation object carried;

[0065] S2. Determine the structure, quantity and distribution position of the vibration isolation support 1 for connecting the vibration isolation object and the base based on the installation and positioning structure of the vibration isolation object; wherein the vibration isolation support 1 comprises: two vibration isolation support portions 11 symmetrically and spaced apart;

[0066] One end of the vibration isolation support part 11 is a fixed end connected to the local resonance structure 2, and the other end is a support end away from the local resonance structure 2;

[0067] The support ends of the two vibration isolation support parts 11 are protruding in directions away from each other, wherein one vibration isolation support part 11 is connected to the vibration isolation object through the support end, and the other vibration isolation support part 11 is connected to the base through the support end; through the above arrangement, the stiffness of the vibration isolation support 1 is composed of upper and lower parts.

[0068] S3. Assume that the multi-line spectrum wave isolator is a node of mass m, and attach a local resonance structure 2 at the node for connecting the vibration isolation support 1 and for changing the vibration energy transmission channel, wherein the local resonance frequency of the local resonance structure 2 is:

[0069] f r =√(k r / m r ) / 2 / π

[0070] Among them, m <M / 10,m r is the mass of the local resonance structure 2, k r is the stiffness of the local resonance structure 2. In this embodiment, under ideal conditions, the mass m of the node can be infinitely close to 0. In this embodiment, the method of adding the local resonance structure 2 in the node does not act on the vibration isolation object, but acts on the multi-line spectrum wave damping vibration isolator itself, so that the vibration transmission process changes.

[0071] According to one embodiment of the present invention, the mass m of the local resonance structure 2 is r The weight M of the vibration isolation object satisfies: m r / M<10%. Through the above arrangement, since the mass ratio of the local resonance structure 2 to the vibration isolation object is very small, the local resonance frequency f r Introducing a vibration isolation valley nearby can reduce the vibration transmission rate by more than 20dB compared with the traditional single-degree-of-freedom vibration isolator. It can be used to isolate broadband vibrations and can also effectively isolate line spectrum vibrations. At the same time, the multi-line spectrum wave isolator set up above will not change the total bearing stiffness. Although the introduction of a vibration isolation valley value will bring an additional peak to the vibration isolator, the damping existing in the main bearing structure will not affect the vibration isolation valley value while significantly reducing the resonance peak, thus taking into account multiple aspects of performance. The principle of this vibration isolator is to install a local resonance unit m in the vibration isolator. r It blocks the transmission channel of vibration energy, so it is called "wave-blocking isolator".

[0072] like Figure 4 As shown, the vibration transfer curve of the vibration isolator of the present invention forms an anti-resonant vibration isolation valley near the local resonance frequency. Without changing the bearing stiffness, it can be used to isolate broadband vibrations and also can efficiently isolate line spectrum vibrations.

[0073] Figure 3 Where M is the weight of the vibration isolation object; m is the weight of the multi-line spectrum wave isolator; m r is the mass of the local resonance structure 2; k ris the stiffness of the local resonance structure 2; c is the damping of the multi-line spectrum wave vibration isolator; k is the stiffness between the multi-line spectrum wave vibration isolator and the vibration isolation object or between the multi-line spectrum wave vibration isolator and the foundation.

[0074] In order to further illustrate the present invention, examples are given.

[0075] Example 1

[0076] like Figure 5 As shown, a simulation model is constructed for verification. Specifically, a main mass block made of aluminum material is selected as the vibration isolation object, with a total mass of 30kg and a mounting hole spacing of 500×255mm. The multi-line spectrum wave isolator used is made of titanium alloy, with a vibration isolation frequency of f0=10Hz and a total mass of only 1.1kg. In order to analyze the vibration isolation performance of the overall structure, the displacement transmission rate T is defined as:

[0077] T=20log 10 |W / W0|

[0078] Where W is the average displacement response of the main mass block, and W0 is the excitation displacement amplitude. The characteristics of anti-resonance vibration isolation are reflected in the presence of an anti-resonance peak with a notch on the displacement transmissibility curve.

[0079] The displacement transmissibility T of the combined model of the vibration isolator and the vibration isolation object constructed above is obtained by COMSOL simulation, and the traditional rubber vibration isolator with the same vibration isolation frequency is simulated for comparison. Figure 6 As shown in the figure, the transmissibility attenuation slopes of the two near the vibration isolation frequency are basically the same. Compared with the traditional rubber vibration isolator, the designed multi-line spectrum wave isolator has obvious anti-resonance peaks near 70Hz, 250Hz, 695Hz, 840Hz, 970Hz and 1085Hz, and the displacement transmissibility attenuation amplitude is large, especially near 250Hz ( Figure 2 The attenuation bandwidth of the mode (shown in (b)) is wide, which can effectively suppress the vibration caused by different excitation input frequencies and achieve low-frequency, multi-line spectrum broadband vibration isolation.

[0080] In addition, the frequency and bandwidth of the anti-resonance peak can be effectively adjusted by changing at least one of the thickness, mass, stiffness, mass distribution mode, and material of the local resonance structure. In the face of different vibration isolation objects (different masses) or different vibration isolation frequencies f0, the thickness and length of the vibration isolation support 11 on the vibration isolator are adjusted to achieve the effect without affecting the frequency of the local resonance peak and the vibration isolation effect.

[0081] Example 2

[0082] like Figure 7As shown, a physical object was constructed for verification. According to the simulation model design in Example 1, a titanium alloy vibration isolator sample was processed, and the mass of the vibration isolator was only 1.1 kg. At the same time, the experimental test system (such as the vibration isolator, the vibration isolation object (30 kg aluminum main mass block), the vibration table and the acceleration sensor) was constructed. Figure 8 As shown in FIG. 1 ). In this embodiment, the vibration isolator is stably connected to the vibration table and the vibration isolation object through the support end of the vibration isolation support 1. And the vibration isolation object and the vibration table are connected to the acceleration sensor respectively. In the experiment, the random vibration excitation condition is selected, and the acceleration power spectrum density function is as follows: Fig. 9 As shown, the RMS value of acceleration is 12.5G.

[0083] Then, the acceleration response of the vibration table and the main mass block were tested respectively, and the vibration isolation characteristics of the vibration isolator were analyzed. The displacement transmissibility obtained by the experiment was as follows: Fig.10 As shown, the vibration isolation frequency is 10Hz. Compared with traditional vibration isolators, the displacement transmissibility of the designed multi-line spectrum vibration isolator has multiple anti-resonance peaks in the range of 80-1000Hz, with wide attenuation bandwidth and high vibration isolation efficiency. In addition, the displacement transmissibility attenuation slope in the range of 20-65Hz is larger. The experiment verifies the low-frequency and multi-line spectrum broadband vibration isolation effect of the designed multi-line spectrum wave-blocking vibration isolator.

[0084] The above contents are merely examples of specific solutions of the present invention. For devices and structures not described in detail therein, it should be understood that they can be implemented by adopting general devices and general methods available in the art.

[0085] The above is only one solution of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-line spectrum wave isolator, characterized in that: include: A vibration isolation support (1) and a local resonance structure (2); The vibration isolation support (1) is provided in plurality around the local resonance structure (2); The vibration isolation support (1) and the local resonance structure (2) are both made of metal; The vibration isolation support (1) comprises: two vibration isolation support parts (11) which are symmetrical and spaced apart from each other; One end of the vibration isolation support part (11) is a fixed end connected to the local resonance structure (2), and the other end is a support end away from the local resonance structure (2); The support ends of the two vibration isolation support parts (11) are protruding in directions away from each other, wherein one vibration isolation support part (11) is connected to the vibration isolation object through the support end, and the other vibration isolation support part (11) is connected to the base through the support end.

2. The multi-line spectrum wave isolator according to claim 1, characterized in that: The vibration isolation support part (11) comprises: a supporting body (111) in the form of a long strip plate and a protruding structure (112); One end of the support body (111) is fixedly connected to the protruding structure (112), and the other end forms a fixed end of the vibration isolation support portion (11) and is used to connect to the local resonance structure (2); The protruding structure (112) forms a supporting end of the vibration isolation support portion (11), and comprises: a connecting member (112a) and a supporting member (112b); The supporting body (111) and the supporting member (112b) are located on opposite sides of the connecting member (112a), wherein one end of the connecting member (112a) is vertically connected to one end of the supporting body (111), and the other end thereof is vertically connected to the supporting member (112b).

3. The multi-line spectrum wave isolator according to claim 2, characterized in that: The two vibration isolation support parts (11) in the vibration isolation support (1) are independent of each other, or the fixed ends of the two vibration isolation support parts (11) are connected to each other.

4. The multi-line spectrum wave isolator according to claim 3, characterized in that: The multiple-order resonance modes of the local resonance structure (2) are used to provide multiple local resonance states, wherein the multiple-order resonance modes correspond to multiple anti-resonance valleys of the vibration isolation curve of the multi-line spectrum wave damping vibration isolator.

5. The multi-line spectrum wave isolator according to claim 4, characterized in that: According to different structural design parameters of the local resonance structure (2), the local resonance frequency of the local resonance structure (2) is adjusted to a plurality of excitation input frequencies respectively, so as to obtain the multi-order resonance modes and the anti-resonance valley values; The structural design parameters include at least one of thickness, mass, stiffness, mass distribution, and material parameters.

6. The multi-line spectrum wave isolator according to claim 5, characterized in that: The local resonance structure (2) is a frame structure, comprising: a crossbeam (21) and a longitudinal beam (22) fixedly connected to each other; A plurality of the cross beams (21) are arranged in parallel, and a plurality of the longitudinal beams (22) are arranged in parallel; The cross beam (21) and the longitudinal beam (22) are integrated.

7. The multi-line spectrum wave isolator according to claim 6, characterized in that: The crossbeam (21) is provided with a hollow structure (211) for reducing weight and adjusting frequency; Along the length direction of the cross beam (21), the hollow structure (211) is located between the positions where the cross beam (21) and the longitudinal beam (22) are connected, and the axial direction of the hollow structure (211) is parallel to the length direction of the longitudinal beam (22).

8. The multi-line spectrum wave isolator according to any one of claims 1 to 7, characterized in that: The vibration isolation support (1) and the local resonance structure (2) are connected by welding or integrally formed; The vibration isolation support (1) and the local resonance structure (2) are both made of stainless steel, titanium alloy or aluminum alloy.

9. A design method for the multi-line spectrum wave isolator according to any one of claims 1 to 8, characterized in that: include: S1. Determine the weight M of the vibration isolation object carried; S2. Determine the structure, quantity and distribution position of the vibration isolation support (1) used to connect the vibration isolation object and the base based on the installation and positioning structure of the vibration isolation object; wherein the vibration isolation support (1) comprises: two symmetrical and spaced vibration isolation support parts (11); One end of the vibration isolation support part (11) is a fixed end connected to the local resonance structure (2), and the other end is a support end away from the local resonance structure (2); The support ends of the two vibration isolation support parts (11) are arranged to protrude in directions away from each other, wherein one of the vibration isolation support parts (11) is connected to the vibration isolation object through the support end, and the other vibration isolation support part (11) is connected to the base through the support end; S3. Assume that the multi-line spectrum wave damping vibration isolator is a node of mass m, and attach a local resonance structure (2) at the node for connecting the vibration isolation support (1) and for changing the vibration energy transmission channel, wherein the local resonance frequency of the local resonance structure (2) is: f r =√(k r / m r ) / 2 / p Among them, m <M / 10,m r is the mass of the local resonance structure (2), k r is the stiffness of the local resonance structure (2).

10. The design method according to claim 9, characterized in that: The mass m of the local resonance structure (2) is r The weight M of the vibration isolation object satisfies: m r / M<10%.

Images