A combined multi-line spectrum wave isolator and design method

Abstract

The present invention relates to a combined multi-line spectrum wave damping vibration isolator and a design method. The combined multi-line spectrum wave damping 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), and the vibration isolation support (1) and the local resonance structure (2) are detachably connected; the upper and lower sides of the vibration isolation support (1) are respectively used to connect a vibration isolation object and a base; wherein the vibration isolation support (1) is a spring, a rubber seat or a cantilever beam structure with elastic force; the local resonance structure (2) has multiple-order resonance modes, and the multiple-order resonance modes are used to provide multiple local resonance states, wherein the multiple-order resonance modes correspond to multiple local resonance peaks of a vibration isolation curve.

Description

Technical Field

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

[0002] Traditional vibration isolators usually only have a single vibration isolation performance and are difficult to meet multiple vibration isolation requirements. Rubber vibration isolators have good damping performance and can effectively suppress the resonant peak transmission rate of the vibration isolator, but the vibration isolation efficiency is low and the environmental adaptability is poor. Anti-resonance vibration isolators have the advantages of both broadband vibration isolation and narrowband line spectrum vibration isolation, and can achieve higher vibration isolation efficiency near certain specific frequencies. However, traditional anti-resonance vibration isolators only have a local resonance state, that is, they have a very low transmission rate only in a narrow frequency range. In order to achieve multi-frequency vibration isolation, it is necessary to attach multiple mass-spring systems to the vibration isolation object (main mass block), which leads to problems such as increased mass of the vibration isolator and complex installation. 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.

[0003] Wave damping vibration isolator is a new type of vibration isolator that takes into account load-bearing, broadband vibration isolation and high-efficiency broadband line spectrum isolation, which is proposed by applying the local resonance principle of acoustic metamaterials. Wave damping vibration isolator regards the load-bearing part as a unit of tiny mass, and attaches / installs a local resonance structure on the unit, so that the dynamic equivalent mass density of the vibration isolator is positive and negative infinite near the local resonance frequency, and the line spectrum is suppressed by the valley value on the vibration transmission rate curve of the entire vibration isolator, which can achieve high-efficiency line spectrum isolation without changing the load-bearing stiffness. However, how to assemble a lightweight, small-sized vibration isolator that can cope with multiple line spectra for different equipment with flexible design in a limited space is a complicated and tedious task, and the integrated wave damping vibration isolator has many consumables, a long time consumption and a very high manufacturing cost. Summary of the invention

[0004] The object of the present invention is to provide a combined multi-line spectrum wave isolator and a design method thereof, so as to realize the flexible design of the multi-line spectrum wave isolator and significantly reduce the production cost.

[0005] To achieve the above-mentioned purpose, the present invention provides a combined multi-line spectrum wave blocking vibration isolator, comprising: a vibration isolation support and a local resonance structure;

[0006] A plurality of vibration isolation supports are arranged around the local resonance structure, and the vibration isolation supports are detachably connected to the local resonance structure;

[0007] The upper and lower sides of the vibration isolation support are respectively used to connect the vibration isolation object and the base; wherein the vibration isolation support is a spring, a rubber seat or a cantilever beam structure with elastic force;

[0008] The local resonance structure has multiple-order resonance modes, and the multiple-order resonance modes are used to provide multiple local resonance states, wherein the multiple-order resonance modes correspond to multiple local resonance peaks of the vibration isolation curve.

[0009] According to one aspect of the present invention, the vibration isolation support is a closed-loop cantilever beam structure having one end connected to the local resonance structure, and the cantilever beam structure is made of metal;

[0010] The localized resonance structure is metallic.

[0011] According to one aspect of the present invention, it also includes: a friction damping structure and a limiting structure;

[0012] The friction damping structure is arranged in the hollow position of the vibration isolation support to suppress the resonance peak transmission rate of the vibration isolator;

[0013] The limiting structure is arranged at the hollow position of the vibration isolation support to suppress the maximum dynamic displacement.

[0014] According to one aspect of the present invention, the friction damping structure and the limiting structure are independently arranged, and along the length direction of the vibration isolation support, the friction damping structure and the limiting structure are arranged at intervals;

[0015] The friction damping structure comprises: a plurality of elastic sheets arranged in parallel and at intervals;

[0016] The upper and lower ends of the elastic sheet are respectively connected to the upper and lower sides of the hollow portion of the vibration isolation support, and the elastic sheet is arranged to be inclined relative to the vibration isolation support.

[0017] The limiting structure comprises: a first limiting portion and a second limiting portion slidably connected to each other;

[0018] The first limiting portion includes: a first connecting structure having a first sliding cavity;

[0019] The upper end of the first connecting structure is connected to the upper side of the vibration isolation support hollow portion, and the lower end of the first connecting structure is provided with a first opening for communicating with the first sliding cavity;

[0020] The second limiting portion includes: a first sliding boss and a first boss connecting member;

[0021] The first sliding boss is slidably connected to the first sliding cavity in a shape matching that of the first sliding cavity, and the cross-sectional size of the first sliding boss is larger than that of the first opening;

[0022] One end of the first boss connector passes through the first opening and is vertically connected to the first sliding boss, and the other end is interconnected with the lower side of the vibration isolation support hollow portion.

[0023] According to one aspect of the present invention, the friction damping structure and the limiting structure are arranged in combination with each other, and along the length direction of the vibration isolation support, the friction damping structure and the limiting structure are arranged in the middle position of the hollow part of the vibration isolation support;

[0024] The friction damping structure comprises: a first spring sheet and a second spring sheet;

[0025] The first spring piece and the second spring piece are symmetrically arranged on the upper side or the lower side of the hollow portion of the vibration isolation support;

[0026] The first elastic sheet and the second elastic sheet are arranged obliquely relative to the vibration isolation support, and the first elastic sheet and the second elastic sheet extend obliquely in a direction away from each other;

[0027] The limiting structure comprises: a third limiting portion and a fourth limiting portion which are slidably connected to each other;

[0028] The third limiting portion includes: a second connecting structure having a second sliding cavity;

[0029] The second connection structure is connected to the friction damping structure at one side of the vibration isolation support hollow portion opposite to the friction damping structure, and a second opening for communicating with the second sliding cavity is provided at one end of the second connection structure opposite to the friction damping structure;

[0030] The width of the end of the second connection structure opposite to the friction damping structure is less than or equal to the maximum spacing distance between the first elastic sheet and the second elastic sheet;

[0031] The fourth limiting portion includes: a second sliding boss and a second boss connecting member;

[0032] The fourth limiting portion is located between the first elastic sheet and the second elastic sheet; wherein the second sliding boss is slidably connected to match the shape of the second sliding cavity, and the cross-sectional size of the second sliding boss is larger than the second opening;

[0033] One end of the second boss connecting piece passes through the second opening and is vertically connected to the second sliding boss, and the other end is interconnected with one side of the hollow portion of the vibration isolation support.

[0034] According to one aspect of the present invention, the local resonance structure is a frame structure, which includes: a cross beam and a longitudinal beam fixedly connected to each other;

[0035] There are a plurality of the cross beams arranged in parallel, and a plurality of the longitudinal beams arranged in parallel;

[0036] The cross beam and the longitudinal beam are integrated;

[0037] The crossbeam is provided with a hollow structure;

[0038] 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.

[0039] According to one aspect of the present invention, the local resonance structure further comprises: a detachable additional support and mass block;

[0040] The opposite ends of the additional support are respectively connected to two adjacent longitudinal beams;

[0041] The mass block is connected to the side of the longitudinal beam.

[0042] According to one aspect of the present invention, the vibration isolation support and the local resonance structure are both made of stainless steel, titanium alloy or aluminum alloy.

[0043] To achieve the above-mentioned purpose, the present invention provides a design method for the aforementioned combined multi-line spectrum wave blocking vibration isolator, comprising:

[0044] S1. Determine the weight M of the vibration isolation object carried;

[0045] S2. Determine the structure, quantity and distribution position of the vibration isolation support 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 adopts a closed-loop cantilever beam structure, and one end of the vibration isolation support is detachably connected to the local resonance structure;

[0046] The upper and lower sides of the vibration isolation support are used to connect the vibration isolation object and the base respectively;

[0047] S3. Assume that the combined 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:

[0048] f r =√(k r / m r ) / 2 / π

[0049] 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.

[0050] 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%.

[0051] According to one solution of the present invention, the vibration isolator of the present invention is designed in combination with a friction damping structure, a local resonance structure, and a limiting structure, so that it has the characteristics of friction damping, multi-line spectrum vibration isolation, and limiting at the same time; wherein, the friction damping structure can generate damping in an environment where rubber materials are not applicable, and effectively suppress the first-order resonance peak. The multi-order resonance modes of the local resonance structure correspond to the multiple anti-resonance peaks of the vibration isolation curve of the vibration isolator, realizing multi-line spectrum vibration isolation. At the same time, the limiting structure can limit the maximum dynamic displacement of the vibration isolation object and maintain the stability of the structure.

[0052] According to one solution of the present invention, the vibration isolator of the present invention can adjust the local resonance peak frequency and effectively suppress the multi-frequency / variable frequency excitation input: wherein, in the design stage of the vibration isolator, multiple local resonance frequencies can be accurately designed by simulating and calculating the multi-order modes of the local resonance structure. After processing, the local resonance frequency can be adjusted within a certain range by adding support structures, adding mass, etc., effectively coping with the deviation of the excitation frequency during the multi-frequency / variable frequency excitation input of the vibration isolation object and the actual operation.

[0053] According to one solution of the present invention, the present invention adopts a pure metal structure, has a small installation space, light additional mass, and is resistant to high temperatures.

[0054] According to one solution of the present invention, the vibration isolator of the present invention can be a pure metal structure, does not need to add additional mass-spring / rubber vibration absorber, has a small installation space, and realizes low-frequency, multi-line spectrum broadband vibration isolation with small additional mass. It is resistant to high temperature, corrosion, and has high strength and reliability.

[0055] According to one solution of the present invention, the vibration isolator of the present invention has a planar structure, the length and width dimensions are determined according to the installation hole spacing of the vibration isolation object, and the height dimension is limited by the installation space, thereby achieving the advantages of compact structure and easy installation.

[0056] According to one scheme of the present invention, the vibration isolator of the present invention can be combined into a multi-line spectrum wave isolator by flexibly selecting elastic support structures, damping structures, limit structures, cross beams and longitudinal beams according to different actual requirements of bearing stiffness, different sizes, different line spectrum frequencies, etc. On the one hand, the design flexibility is greatly improved, and on the other hand, the production cost can be greatly reduced through the assembly / welding of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 A schematic diagram showing the structure of a combined multi-line spectrum wave damping vibration isolator according to an embodiment of the present invention;

[0058] Figure 2 A schematic diagram showing a combined structure of a vibration isolation support, a friction damping structure and a limiting structure according to an embodiment of the present invention;

[0059] Figure 3 A schematic diagram showing a combined structure of a vibration isolation support, a friction damping structure and a limiting structure according to another embodiment of the present invention;

[0060] Figure 4 A schematic diagram showing a structure of a local resonance structure according to an embodiment of the present invention;

[0061] Figure 5 A structural diagram schematically showing a local resonance structure according to another embodiment of the present invention;

[0062] Figure 6 A schematic diagram showing a combined model of a combined multi-line spectrum wave damping vibration isolator and a vibration isolation object according to an embodiment of the present invention;

[0063] Figure 7 Schematic representation Figure 6 Displacement transmissibility curve of the combined model;

[0064] Figure 8a Schematically showing an anti-resonance frequency diagram of a local resonance structure according to one embodiment of the present invention;

[0065] Figure 8b A diagram schematically showing a local resonance frequency diagram of a local resonance structure after connecting an additional support according to an embodiment of the present invention;

[0066] Fig. 9 A schematic diagram showing a physical sample of a combined multi-line spectrum wave isolator according to an embodiment of the present invention

[0067] Fig.10 Schematic representation based on Fig. 9 The experimental test system diagram of the combined multi-line spectrum wave isolator constructed in;

[0068] Fig.11a Schematic representation Fig.10 Figure 2. Metal friction damping test results of the experimental test system.

[0069] Fig.11b Schematic representation Fig.10 The power spectrum density function diagram of random vibration acceleration of the experimental test system;

[0070] Fig.12 Schematic representation Fig.10 Figure 2. Test results of physical samples of combined multi-line spectrum wave isolators in the experimental test system. DETAILED DESCRIPTION

[0071] 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.

[0072] 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.

[0073] Combination Figure 1 and Figure 2As shown, according to an embodiment of the present invention, a combined multi-line spectrum wave isolator of the present invention comprises: an isolation support 1 and a local resonance structure 2. In this embodiment, the isolation support 1 and the local resonance structure 2 are both made of metal; wherein, a plurality of the isolation supports 1 are arranged around the local resonance structure 2; for example, four isolation supports 1 are arranged at intervals around the local resonance structure 2, for realizing a four-point connection between the isolation object and the base. In this embodiment, the isolation support 1 is a closed-loop cantilever beam structure connected to the local resonance structure 2 at one end. By adopting a closed-loop cantilever beam structure, the static bearing capacity of the isolator of the present invention is effectively improved, and the deformation is reduced. In this embodiment, the isolation support 1 is in the shape of a long ring as a whole, one end of which is interconnected with the side of the local resonance structure 2, and the other end is in an arc-shaped structure. In this embodiment, the cross-sectional shape of the hollow part of the isolation support 1 is in the shape of a waist circle. The above-mentioned isolation support 1 effectively controls the dynamic stiffness of the entire structure and effectively reduces the height dimension.

[0074] In this embodiment, 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 local resonance peaks of the vibration isolation curve. In this embodiment, the vibration isolation displacement transmission rate attenuation zone (local resonance peak) of the vibration isolator depends on the resonance mode of the local resonance structure 2 in the vibration isolator, and can be applied to vibration isolation applications of different structures. In this embodiment, by changing the structural mode 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, which are used 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.

[0075] Through the above arrangement, the present invention can have the effect of multi-line spectrum broadband vibration isolation. Especially in the case of selectively adding mass, low-frequency, multi-line spectrum broadband vibration isolation can be fully achieved.

[0076] Combination Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, it also includes: a friction damping structure 3 and a limiting structure 4. In this embodiment, the friction damping structure 3 is arranged in the hollow position of the vibration isolation support 1 to suppress the resonance peak transmission rate of the vibration isolator; the limiting structure 4 is arranged in the hollow position of the vibration isolation support 1 to suppress the maximum dynamic displacement.

[0077] Through the above-mentioned arrangement, by combining the friction damping structure 3 and the limiting structure 4 in the vibration isolation support 1, the present invention simultaneously has excellent characteristics such as friction damping, multi-line spectrum vibration isolation, and limiting. Among them, the friction damping structure 3 utilizes the contact friction damping generated when the vibration isolator vibrates to suppress the resonance peak transmission rate of the vibration isolator. The limiting structure 4 can limit the maximum dynamic displacement of the vibration isolation object (the static deformation is considered in the design stage), avoid excessive vibration amplitude during operation, and maintain structural stability.

[0078] Combination Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, the friction damping structure 3 and the limiting structure 4 are independently arranged, and along the length direction of the vibration isolation support 1, the friction damping structure 3 and the limiting structure 4 are arranged at intervals.

[0079] Combination Figure 1 and Figure 2 As shown, according to one embodiment of the present invention, the friction damping structure 3 includes: a plurality of elastic sheets 31 arranged in parallel and at intervals. The upper and lower ends of the elastic sheet 31 are respectively connected to the upper and lower sides of the hollow part of the vibration isolation support 1, and the elastic sheet 31 is arranged to be inclined relative to the vibration isolation support 1. In this embodiment, the elastic sheet 31 can be made by integrally processing and molding with the vibration isolation support 1 to ensure the stability and reliability of the structure and the support strength. It is also possible to provide installation grooves on the upper and lower sides of the hollow part of the vibration isolation support 1 so that the elastic sheet 31 can be plugged into the installation grooves by plugging, so as to facilitate the adjustment of the number of elastic sheets 31 and the replacement of the elastic sheets 31 to adapt to different working conditions.

[0080] Through the above arrangement, friction damping is generated by the contact between the elastic sheets 31 when the vibration isolator vibrates, thereby suppressing the resonance peak transmission rate of the vibration isolator and improving the vibration isolation performance.

[0081] Combination Figure 1 and Figure 2As shown, according to an embodiment of the present invention, the limiting structure 4 includes: a first limiting portion 41 and a second limiting portion 42 that are slidably connected to each other. In this embodiment, the first limiting portion 41 includes: a first connecting structure 411 having a first sliding cavity; the upper end of the first connecting structure 411 is mutually connected to the upper side of the hollow part of the vibration isolation support 1, and the lower end of the first connecting structure 411 is provided with a first opening for connecting the first sliding cavity. In this embodiment, the first connecting structure 411 can be a hollow rectangular cylinder, which is arranged horizontally in the axial direction, and the upper end of its side wall is directly connected to the upper side of the hollow part of the vibration isolation support 1 or is mutually connected through a plate-like connecting member, and the lower end of its side wall can be provided with a first opening (such as a rectangular opening). Of course, the first connecting structure 411 can be a hollow cylinder, which is arranged vertically in the axial direction, and the upper end of its side wall is directly connected to the upper side of the hollow part of the vibration isolation support 1 or is mutually connected through a columnar connecting member, and the lower end can be provided with a first opening (such as a rectangular opening, a circular opening).

[0082] In this embodiment, the second limiting portion 42 includes: a first sliding boss 421 and a first boss connector 422; wherein the first sliding boss 421 is slidably connected to match the shape of the first sliding cavity, and the cross-sectional size of the first sliding boss 421 is larger than the first opening; one end of the first boss connector 422 passes through the first opening and is vertically connected to the first sliding boss 421, and the other end is interconnected with the lower side of the hollow portion of the vibration isolation support 1. In this embodiment, the cross-sectional shape of the first boss connector 422 is matched with the shape of the first opening.

[0083] like Figure 3 As shown, according to another embodiment of the present invention, the friction damping structure 3 and the limiting structure 4 are arranged in combination with each other, and along the length direction of the vibration isolation support 1, the friction damping structure 3 and the limiting structure 4 are arranged in the middle position of the hollow part of the vibration isolation support 1.

[0084] Through the above arrangement, the limit structure 4 is combined with the friction damping structure 3 to simplify the friction damping structure, thereby achieving the dual functions of friction damping and limiting the maximum displacement, and the structure is simple.

[0085] like Figure 3As shown, according to one embodiment of the present invention, the friction damping structure 3 includes: a first spring piece 31a and a second spring piece 31b. In this embodiment, the first spring piece 31a and the second spring piece 31b are symmetrically arranged on the upper side or the lower side of the hollow part of the vibration isolation support 1; the first spring piece 31a and the second spring piece 31b are inclined relative to the vibration isolation support 1, and the first spring piece 31a and the second spring piece 31b extend obliquely in a direction away from each other. In this embodiment, the friction damping structure 3 can be made by integrally forming with the vibration isolation support 1 to ensure the stability, reliability and support strength of the structure; or by setting a mounting groove on the vibration isolation support 1, and inserting the first spring piece 31a and the second spring piece 31b into the mounting groove by plugging to achieve installation, so as to facilitate the adjustment of the number of elastic pieces 31 and the replacement of the elastic pieces 31 to adapt to different working conditions.

[0086] In this embodiment, the limiting structure 4 includes: a third limiting portion 43 and a fourth limiting portion 44 which are slidably connected to each other; wherein the third limiting portion 43 includes: a second connecting structure 431 having a second sliding cavity; the second connecting structure 431 is connected to one side of the hollow portion of the vibration isolation support 1 opposite to the friction damping structure 3, and the end of the second connecting structure 431 opposite to the friction damping structure 3 is provided with a second opening for connecting to the second sliding cavity.

[0087] In this embodiment, the second connection structure 431 can be a hollow rectangular cylinder, which is arranged horizontally in the axial direction, and the upper end of its side wall is directly connected to the upper side of the hollow part of the vibration isolation support 1 or is connected to each other through a plate-shaped connecting member, and the lower end of its side wall can be provided with a first opening (such as a rectangular opening). Of course, the second connection structure 431 can be a hollow cylinder, which is arranged vertically in the axial direction, and the upper end of its side wall is directly connected to the upper side of the hollow part of the vibration isolation support 1 or is connected to each other through a columnar connecting member, and the lower end can be provided with a second opening (such as a rectangular opening, a circular opening).

[0088] In this embodiment, the width of the end of the second connection structure 431 opposite to the friction damping structure 3 is less than or equal to the maximum spacing distance between the first spring piece 31a and the second spring piece 31b. Through the above arrangement, when the second connection structure 431 moves relative to the fourth limiter 44 under the load of the vibration isolation support 1, it can achieve abutment with the first spring piece 31a and the second spring piece 31b, thereby achieving the dual effects of friction damping and maximum dynamic displacement.

[0089] In this embodiment, the fourth limiting portion 44 includes: a second sliding boss 441 and a second boss connecting member 442; wherein the fourth limiting portion 44 is located between the first spring sheet 31a and the second spring sheet 31b; wherein the second sliding boss 441 is slidably connected to the second sliding cavity in a shape matching that of the second sliding cavity, and the cross-sectional size of the second sliding boss 441 is larger than the second opening; the second boss connecting member 442 is vertically connected to the second sliding boss 441 through the second opening, and the other end is interconnected with one side of the hollow portion of the vibration isolation support 1 (i.e., the side where the friction damping structure 3 is set). In this embodiment, the cross-sectional shape of the second boss connecting member 442 is matched with the shape of the second opening.

[0090] 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 that are fixedly connected to each other. In this embodiment, a plurality of cross beams 21 are arranged in parallel, and a plurality of longitudinal beams 22 are arranged in parallel, and the cross beams 21 and the longitudinal beams 22 are integrated. In this embodiment, a hollow structure 211 is provided on the cross beam 21; wherein, 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.

[0091] The local resonance structure 2 arranged as above has multiple-order resonance modes and provides multiple local resonance states, thereby realizing multi-line spectrum vibration isolation.

[0092] Combination Figure 4 and Figure 5 As shown, according to an embodiment of the present invention, the local resonance structure 2 further includes: a detachable additional support 23 and a mass block 24. In this embodiment, the mass block 24 can be set on the side of any longitudinal beam 22, and the number of the mass blocks 24 can be set as needed. Of course, the mass blocks 24 can also be set on the opposite sides of the longitudinal beam 22, and the specific setting positions can be adjusted as needed. In this embodiment, the opposite ends of the additional support 23 are respectively connected to the two adjacent longitudinal beams 22.

[0093] Through the above-mentioned arrangement, by selectively installing additional supports 23 and / or mass blocks 23, it is possible to increase the stiffness and / or mass of the local resonance structure 2, thereby increasing or decreasing the local resonance frequency within a certain range, and adjusting it to the excitation input frequency, thereby effectively coping with the deviation between the multi-frequency / variable-frequency excitation input of the vibration isolation object and the excitation frequency during actual operation.

[0094] like Figure 1As shown, according to one embodiment of the present invention, the vibration isolation support 1 and the local resonance structure 2 are connected by welding, detachable connection or integral molding. When the detachable connection is adopted, it can be connected by a threaded connector, or connected by a plug-in connection of a buckle and a groove, so as to facilitate the assembly of different vibration isolation supports 1 and local resonance structures 2, so as to be conveniently applicable to different vibration isolation objects.

[0095] like Figure 1 As shown, according to one embodiment of the present invention, the vibration isolation support 1 and the local resonance structure 2 are both made of stainless steel, titanium alloy or aluminum alloy. In this embodiment, when the friction damping structure 3, the limiting structure 4 and the vibration isolation support 1 are integrally formed, the same metal material as the vibration isolation support 1 can be used.

[0096] like Figure 1 As shown, according to one embodiment of the present invention, a mounting boss 11 for mounting a vibration isolation object or a base is further provided on the outer side of the vibration isolation support 1. In this embodiment, the mounting boss 11 is respectively provided at the upper and lower ends of the vibration isolation support 1, wherein the mounting boss 11 at the upper end is used to support the vibration isolation object, and the mounting boss 11 at the lower end is used to connect with the base. In this embodiment, the mounting bosses 11 provided at the upper and lower ends of the vibration isolation support 1 are aligned with each other to ensure stable support. In this embodiment, the mounting boss 11 is opposite to the friction damping structure 3 provided in the hollow part of the vibration isolation support 1, so that the force positions of the friction damping structure 3 and the vibration isolation support 1 correspond to each other, ensuring the reliable operation and timely and effective response of the friction damping structure 3.

[0097] According to another embodiment of the present invention, the vibration isolation support 1 can also be configured as a spring or a rubber seat, and can be selectively installed with the local resonance structure 2 in a detachable manner.

[0098] According to one embodiment of the present invention, a design method for the aforementioned combined multi-line spectrum wave isolator of the present invention comprises:

[0099] S1. Determine the weight M of the vibration isolation object carried;

[0100] 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 adopts a closed-loop cantilever beam structure, and one end of the vibration isolation support 1 is detachably connected to the local resonance structure 2. In this embodiment, the upper and lower sides of the vibration isolation support 1 are respectively used to connect the vibration isolation object and the base;

[0101] S3. Assume that the combined 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:

[0102] f r =√(k r / m r ) / 2 / π

[0103] 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.

[0104] 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 meets the following conditions: 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 combined multi-line spectrum wave-blocking vibration isolator set up as 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".

[0105] The vibration transfer curve of the vibration isolator of the present invention forms an anti-resonant vibration isolation valley near the local resonance frequency, and can be used to isolate broadband vibrations and also can efficiently isolate line spectrum vibrations without changing the bearing stiffness.

[0106] According to an embodiment of the present invention, in step S2, in the step of determining the structure of the vibration isolation support 1, a friction damping structure 3 and a limiting structure 4 may be further provided for the vibration isolation support 1; wherein the friction damping structure 3 is provided in the hollow position of the vibration isolation support 1 to suppress the resonance peak transmission rate of the vibration isolator; the limiting structure 4 is also provided in the hollow position of the vibration isolation support 1 to suppress the maximum dynamic displacement. The specific structural composition and form of the friction damping structure 3 and the limiting structure 4 are as described above and will not be repeated here.

[0107] To further illustrate the present invention, the following examples are given.

[0108] Example 1

[0109] like Figure 6 As shown, a simulation model is constructed for verification. Specifically, a vibration isolation object is selected as a 30kg aluminum mass block, and the hole spacing for positioning and installation is 500×259mm. Correspondingly, a vibration isolator model made of titanium alloy material is constructed, and the hollow part of the vibration isolation support 1 of the vibration isolator model is provided with a friction damping structure 3 and a limiting structure 4, and the friction damping structure 3 and the limiting structure 4 are independent of each other and arranged at intervals. In this embodiment, the setting position of the mounting boss 11 on the vibration isolation support 1 is set corresponding to the hole spacing of the vibration isolation object to ensure the stable installation of the vibration isolation object. In this embodiment, the vibration isolation frequency f0=25Hz of the constructed vibration isolator model, and the mass is less than 1.2kg.

[0110] In order to evaluate the vibration isolation performance of the vibration isolator model, the displacement transmissibility T is defined as:

[0111] T=20log 10 |W / W0|

[0112] Where W is the average displacement amplitude of the vibration isolation object, and W0 is the excitation displacement amplitude. Local resonance vibration isolation forms an anti-resonance valley value of the wave blocking in the vibration transmissibility curve of the vibration isolator (the anti-resonance valley value is caused by the local resonance peak).

[0113] The displacement transmission rate T of the above embodiment is calculated by simulation software, and a traditional rubber isolator with the same vibration isolation frequency is selected for comparison. Figure 7 As shown in the figure, compared with the traditional vibration isolator, the designed combined multi-line spectrum wave-blocking vibration isolator has multiple local resonance peaks within the range of 2000Hz, a large displacement transmission rate attenuation amplitude, and a wide attenuation band. It can effectively suppress the vibration caused by different excitation input frequencies and realize multi-line spectrum broadband vibration isolation. Through the friction damping effect of the wave-blocking vibration isolator, the resonance peak transmission rate of the vibration isolator is suppressed to 16dB, which is close to the rubber damping effect. The limit structure limits the maximum dynamic displacement of the vibration isolator to 1mm to avoid excessive vibration amplitude during operation.

[0114] Assume that the working speed of the vibration isolation object is 2930rpm, that is, the excitation frequency is 49Hz. By changing the mode of the intermediate connection structure (i.e., local resonance structure 2), the local resonance frequency can be precisely controlled at 49Hz and 98Hz (multiple frequency), as shown in Figure 8a After the main structure of the vibration isolator is completed, Figure 4 and Figure 5 As shown, the local resonance frequency can be increased to 54 Hz by adding support, and the local resonance frequency can be reduced to 44 Hz by adding mass, as shown in FIG. Figure 8b By changing the size of the additional support, the local resonance frequency can be adjusted within the range of ±1-6Hz, effectively coping with the deviation between the multi-frequency / variable frequency excitation input of the vibration isolation object and the excitation frequency during actual operation.

[0115] Example 2

[0116] like Fig. 9 As shown, a physical object is constructed for verification. According to the simulation model design in Example 1, a titanium alloy vibration isolator sample is processed, and the mass of the vibration isolator is less than 1.2kg. The experimental test system (such as Fig.10 shown).

[0117] First, the damping effect of the friction damping structure 3 is tested, such as Fig.11a As shown in Figure 3, under different excitation conditions, the friction damping of the friction damping structure 3 suppresses the vibration isolation curve vibration isolator resonance peak transmission rate within 20dB, and the larger the excitation amplitude, the more obvious the damping effect. In the experiment, random vibration excitation conditions were selected, and the acceleration power spectrum density function was as follows: Fig.11b As shown, the RMS value of acceleration is 12.5G.

[0118] Secondly, analyze the vibration isolation characteristics of the vibration isolator, test the acceleration response of the vibration isolation object and the vibration table, and obtain the displacement transmission rate of the vibration isolator as follows: Fig.12 As shown. Compared with traditional vibration isolators, the displacement transmissibility of the designed vibration isolator has multiple local resonance peaks within the range of 2000Hz, the low-frequency transmissibility attenuation slope is large, and the attenuation bandwidth is wide. The experiment verified the multifunctional vibration isolation effects of the combined multi-line spectrum wave-blocking vibration isolator, such as multi-line spectrum broadband vibration isolation, first-order resonance peak damping attenuation, and maximum dynamic displacement limitation.

[0119] 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.

[0120] 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 combined multi-line spectrum wave isolator, characterized in that: include: Vibration isolation support (1), local resonance structure (2), friction damping structure (3) and limiting structure (4); A plurality of the vibration isolation supports (1) are arranged around the local resonance structure (2), and the vibration isolation supports (1) are detachably connected to the local resonance structure (2); The upper and lower sides of the vibration isolation support (1) are respectively used to connect the vibration isolation object and the base; wherein the vibration isolation support (1) is a cantilever beam structure with elastic force; The local resonance structure (2) has multiple-order resonance modes, and the multiple-order resonance modes are used to provide multiple local resonance states, wherein the multiple-order resonance modes correspond to multiple local resonance peaks of the vibration isolation curve; The vibration isolation support (1) is a closed-loop cantilever beam structure with one end connected to the local resonance structure (2); The friction damping structure (3) is arranged at a hollow position of the vibration isolation support (1) and is used to suppress the resonance peak transmission rate of the vibration isolator; The limiting structure (4) is arranged at a hollow position of the vibration isolation support (1) and is used to suppress the maximum dynamic displacement.

2. The combined multi-line spectrum wave isolator according to claim 1 is characterized in that: The cantilever beam structure is made of metal; The local resonance structure (2) is metallic.

3. The combined multi-line spectrum wave isolator according to claim 2 is characterized in that: The friction damping structure (3) and the limiting structure (4) are independently arranged, and along the length direction of the vibration isolation support (1), the friction damping structure (3) and the limiting structure (4) are arranged at intervals; The friction damping structure (3) comprises: a plurality of elastic sheets (31) arranged in parallel and at intervals; The upper and lower ends of the elastic sheet (31) are respectively connected to the upper and lower sides of the hollow portion of the vibration isolation support (1), and the elastic sheet (31) is arranged to be inclined relative to the vibration isolation support (1); The limiting structure (4) comprises: a first limiting portion (41) and a second limiting portion (42) which are slidably connected to each other; The first limiting portion (41) comprises: a first connecting structure (411) having a first sliding cavity; The upper end of the first connection structure (411) is connected to the upper side of the hollow portion of the vibration isolation support (1), and the lower end of the first connection structure (411) is provided with a first opening for communicating with the first sliding cavity; The second limiting portion (42) comprises: a first sliding boss (421) and a first boss connecting member (422); The first sliding boss (421) is slidably connected to the first sliding cavity in a shape matching that of the first sliding cavity, and the cross-sectional size of the first sliding boss (421) is larger than that of the first opening; One end of the first boss connecting member (422) passes through the first opening and is vertically connected to the first sliding boss (421), and the other end is interconnected with the lower side of the hollow portion of the vibration isolation support (1).

4. The combined multi-line spectrum wave isolator according to claim 2 is characterized in that: The friction damping structure (3) and the limiting structure (4) are arranged in combination with each other, and along the length direction of the vibration isolation support (1), the friction damping structure (3) and the limiting structure (4) are arranged at a middle position of the hollow part of the vibration isolation support (1); The friction damping structure (3) comprises: a first spring sheet (31a) and a second spring sheet (31b); The first elastic sheet (31a) and the second elastic sheet (31b) are symmetrically arranged on the upper side or the lower side of the hollow portion of the vibration isolation support (1); The first elastic sheet (31a) and the second elastic sheet (31b) are arranged obliquely relative to the vibration isolation support (1), and the first elastic sheet (31a) and the second elastic sheet (31b) extend obliquely in a direction away from each other; The limiting structure (4) comprises: a third limiting portion (43) and a fourth limiting portion (44) which are slidably connected to each other; The third limiting portion (43) comprises: a second connecting structure (431) having a second sliding cavity; The second connection structure (431) is connected to one side of the hollow portion of the vibration isolation support (1) opposite to the friction damping structure (3), and a second opening for communicating with the second sliding cavity is provided at one end of the second connection structure (431) opposite to the friction damping structure (3); The width of the end of the second connection structure (431) opposite to the friction damping structure (3) is less than or equal to the maximum spacing distance between the first elastic sheet (31a) and the second elastic sheet (31b); The fourth limiting portion (44) comprises: a second sliding boss (441) and a second boss connecting member (442); The fourth limiting portion (44) is located between the first elastic sheet (31a) and the second elastic sheet (31b); wherein the second sliding boss (441) is slidably connected to match the shape of the second sliding cavity, and the cross-sectional size of the second sliding boss (441) is larger than the second opening; One end of the second boss connecting member (442) passes through the second opening and is vertically connected to the second sliding boss (441), and the other end is interconnected with one side of the hollow portion of the vibration isolation support (1).

5. The combined multi-line spectrum wave isolator according to any one of claims 1 to 4, 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; The crossbeam (21) is provided with a hollow structure (211); 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).

6. The combined multi-line spectrum wave isolator according to claim 5, characterized in that: The local resonance structure (2) further comprises: a detachable additional support (23) and a mass block (24); The opposite ends of the additional support (23) are respectively connected to two adjacent longitudinal beams (22); The mass block (24) is connected to the side of the longitudinal beam (22).

7. The combined multi-line spectrum wave isolator according to claim 6, characterized in that: The vibration isolation support (1) and the local resonance structure (2) are both made of stainless steel, titanium alloy or aluminum alloy.

8. A design method for the combined multi-line spectrum wave isolator according to any one of claims 1 to 7, characterized in that: include: S1. Determine the weight of the vibration isolation object being carried M ; 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) adopts a closed-loop cantilever beam structure, and one end of the vibration isolation support (1) is detachably connected to the local resonance structure (2); The upper and lower sides of the vibration isolation support (1) are respectively used to connect the vibration isolation object and the base; S3. Assume that the combined multi-line spectrum wave isolator has a mass m A node is formed at the node, and a local resonance structure (2) is attached to 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 / π in, 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).

9. The design method according to claim 8, characterized in that: The mass of the local resonance structure (2) m r The weight of the vibration isolation object M Satisfaction: m r / M <10%.

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