Design method and device for vibration reduction of display board type hydraulic oil cylinder

Abstract

The invention discloses a design method and device for vibration reduction of a display board type hydraulic oil cylinder, and the vibration reduction design strategy can realize effective attenuation of low-medium-high full-band vibration energy and impact vibration energy of the oil cylinder device through the synergistic combination effect of a plurality of vibration reduction technologies on the basis of not disassembling and modifying the original oil cylinder device. The multi-vibration reduction technology comprises a vibration absorption technology, a vibration resistance technology and a vibration isolation technology. In addition, vibration reduction devices related to the three vibration reduction technologies are all made of pure metal materials, and the good environment adaptability is achieved. In conclusion, compared with an existing single damping material vibration reduction scheme, the vibration energy attenuation capacity is obviously improved, the vibration reduction effect frequency band range is also greatly widened, meanwhile, the pure metal design enables the vibration reduction device to have the good environmental adaptability, and the vibration reduction device has the good application prospect. And the comprehensive application requirements of actual engineering on the vibration reduction effect and the reliable adaptive capacity can be well met.

Description

Technical Field

[0001] The invention belongs to the technical field of passive vibration reduction, and in particular relates to a design method and device for vibration reduction of a display plate type hydraulic cylinder. Background Art

[0002] Hydraulic cylinder equipment has strict air tightness requirements, and the vibration reduction design of the cylinder equipment is generally carried out by attaching some viscoelastic damping materials to the outside of the cylinder. However, conventional viscoelastic materials are mostly high molecular polymers such as rubber and nylon, and their shear modulus and damping loss factor are easily affected by temperature. In addition, the durability, oil resistance and corrosion resistance of viscoelastic damping materials are poor, and it is difficult to stably and permanently apply them to the harsh actual working conditions of cylinder equipment. In addition, conventional viscoelastic materials do not have subwavelength characteristics and can only show attenuation effects on vibration energy in the medium and high frequency bands, making them difficult to use for low-frequency vibration suppression.

[0003] The local resonance vibration absorption superstructure can realize the low-frequency elastic wave band gap, making it possible to achieve efficient attenuation of low-frequency vibration energy through a microstructure with subwavelength size. Compared with conventional viscoelastic damping materials, metal micro-particle dampers also have excellent damping dissipation characteristics, which can achieve effective attenuation of vibration energy in the medium and high frequency bands. The pure metal design enables it to overcome the defects of poor durability, oil resistance and corrosion resistance of conventional viscoelastic materials. The metal wire texture vibration isolation pad is made of stainless steel wire and has excellent environmental adaptability. It can achieve effective buffering and absorption of impact vibration energy by using the interaction between extrusion deformation, friction collision and other interactions between metal wires. At present, the countermeasures for vibration reduction design of hydraulic cylinders are relatively inefficient and single in form. It is necessary to develop new and efficient vibration reduction design strategies for cylinder equipment to achieve effective attenuation of low-medium-high full-band vibration energy and impact vibration energy of cylinder equipment. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing vibration reduction technology of cylinder devices, and to provide a design method and device for vibration reduction of a display panel type hydraulic cylinder. By combining low-frequency vibration absorption technology, medium- and high-frequency vibration resistance technology, and buffering vibration isolation technology, it is used to achieve more effective attenuation of low-medium-high full-frequency vibration energy and impact vibration energy of the cylinder device.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A design method for vibration reduction of a display panel type hydraulic cylinder comprises the following steps: 1) Import the three-dimensional model of the display panel hydraulic cylinder device into COMSOL Multiphysics finite element software for modal analysis. According to the resonance modal displacement cloud map of the cylinder device, determine the concentrated area of ​​its vibration energy, vibration displacement direction and resonance peak frequency; 2) According to the value of the resonance peak frequency, select the local resonance vibration absorption superstructure unit, and design the support frame for supporting the vibration absorption unit; 3) Adjust the geometric design parameters of the vibration absorption unit, calculate the energy band dispersion curves and modal vibration diagrams of each order of the vibration absorption unit, determine the local resonance band gap frequency range and band gap type of the unit, so that the target resonance peak frequency falls within the band gap range of the unit, and at the same time, the band gap type of the vibration absorption unit can achieve the vibration reduction effect on the target vibration mode; 4) According to the vibration energy concentration area and the vibration displacement direction there, the adjusted vibration absorption unit is combined with the support frame to form a vibration absorption supercell, and the vibration absorption supercell is attached to the outer surface of the vibration energy concentration area at the corresponding resonance frequency, and the vibration displacement direction is kept consistent with the out-of-plane vibration direction of the "spring-mass" system of the vibration absorption supercell; 5) According to the resonance peak frequency value and the corresponding vibration energy concentration area, when the resonance peak frequency is in the medium and high frequency range above 500 Hz, the outer surface configuration of the cylinder device in the vibration energy concentration area is considered, and the particle damper is designed and prepared based on the conformal matching design concept, and attached to the outer surface of the medium and high frequency vibration energy concentration area; 6) Considering the assembly connection between the display panels on both sides of the cylinder device and the external matrix, design the metal rubber vibration isolation pad; 7) Prepare metal rubber vibration isolation pads and arrange them at the contact points between the display panels on both sides of the cylinder device and the external matrix, and connect the display panels on both sides of the cylinder, the metal rubber vibration isolation pads and the external matrix; 8) After the additional arrangement of vibration-absorbing supercells, particle dampers and metal rubber vibration isolation pads is completed, simulation calculations are carried out and vibration experiments are carried out to verify the vibration reduction effect under the synergistic effect of multiple vibration reduction technologies.

[0006] A further improvement of the present invention is that, based on the modal analysis results of the cylinder device, vibration absorbing supercells and particle dampers are attached to the outer surfaces of the piston rod, the left cylinder body, the middle cylinder body and the right cylinder body, and metal rubber vibration isolation pads are arranged at the assembly connection between the upper and lower expansion plates and the external substrate.

[0007] A further improvement of the present invention is that the vibration-absorbing supercell is composed of a vibration-absorbing superstructure unit and a supporting frame. The vibration-absorbing superstructure unit works based on the principle of local resonance, and includes a cylindrical mass body providing concentrated mass, a thin plate providing stiffness, and a frame providing support. A circular hole is processed at the center of the thin plate to split the cylindrical mass body into an upper and lower part. The upper part extends a section of external thread, and the lower part is processed with a section of internal thread. The external thread of the upper part passes through the central circular hole of the thin plate and is connected to the internal thread of the lower part, so as to realize the assembly combination of the cylindrical mass body and the thin plate, and the supporting frame is connected and combined with the thin plate at the outer edge position by spot welding or gluing. The supporting frame also adopts the equipment matching compliant design concept, and performs customized appearance design according to the structural characteristics of the cylinder device at the attached position to ensure that the supporting frame and the cylinder device can be smoothly matched and attached.

[0008] A further improvement of the present invention is that the thin plate structure of the vibration absorbing superstructure unit is constructed by double-helix slit grooving. Such a thin plate structure in the form of a double-helix slit structure can obtain lower stiffness characteristics and achieve effective attenuation of low-frequency vibration energy.

[0009] A further improvement of the present invention is that the particle damper consists of a cavity shell and a sealing cover plate, the cavity shell is filled with tungsten powder particles, and then the sealing cover plate is fastened to the cavity shell by bolts, and the damping dissipation effects such as friction and collision between the tungsten powder particles in the particle damper cavity are utilized to achieve effective broadband attenuation of high-frequency vibration energy in the cylinder device.

[0010] A further improvement of the present invention is that the metal rubber vibration isolation pad is woven from 316 stainless steel wire according to set wire diameter requirements and weaving density requirements.

[0011] A further improvement of the present invention is that the specific structural shape of the metal rubber vibration isolation pad is determined according to its installation layout position, and the holes are punched according to the installation bolt positions of the upper and lower display plates of the oil cylinder device.

[0012] A design device for vibration reduction of a display panel type hydraulic cylinder, comprising: The first determination module imports the three-dimensional model of the display panel hydraulic cylinder device into the COMSOL Multiphysics finite element software for modal analysis, and determines the concentrated area of ​​vibration energy, vibration displacement direction and resonance peak frequency of the cylinder device according to the resonance modal displacement cloud map; The first design module selects the local resonance vibration absorption superstructure unit according to the resonance peak frequency value, and designs the support frame for supporting the vibration absorption unit; The second determination module adjusts the geometric design parameters of the vibration absorbing unit, calculates the energy band dispersion curves and modal vibration shape diagrams of each order of the vibration absorbing unit, and determines the local resonance band gap frequency range and band gap type of the unit, so that the target resonance peak frequency falls within the band gap range of the unit, and at the same time the band gap type of the vibration absorbing unit can achieve a vibration reduction effect on the target vibration mode; Combination module: According to the vibration energy concentration area and the vibration displacement direction there, the adjusted vibration absorption unit is combined with the support frame to form a vibration absorption supercell, and the vibration absorption supercell is attached to the outer surface of the vibration energy concentration area at the corresponding resonance frequency, and the vibration displacement direction is kept consistent with the out-of-plane vibration direction of the "spring-mass" system of the vibration absorption supercell; The additional module is based on the resonance peak frequency value and the corresponding vibration energy concentration area. When the resonance peak frequency is in the medium and high frequency range above 500 Hz, the outer surface configuration of the cylinder device in the vibration energy concentration area is considered, and the particle damper is designed and prepared based on the conformal matching design concept, and attached to the outer surface of the medium and high frequency vibration energy concentration area; The second design module considers the assembly connection between the display panels on both sides of the cylinder device and the external matrix, and designs the metal rubber vibration isolation pad; Connecting module, prepare metal rubber vibration isolation pads, and arrange them at the contact connection between the display panels on both sides of the cylinder device and the external matrix, and connect the display panels on both sides of the cylinder, the metal rubber vibration isolation pads and the external matrix; After the inspection module, vibration-absorbing supercells, particle dampers and metal rubber vibration isolation pads are additionally arranged, simulation calculations are carried out and vibration experiments are carried out to verify the vibration reduction effect under the synergistic effect of multiple vibration reduction technologies.

[0013] A further improvement of the present invention is that, based on the modal analysis results of the cylinder device, vibration absorbing supercells and particle dampers are attached to the outer surfaces of the piston rod, the left cylinder body, the middle cylinder body and the right cylinder body, and metal rubber vibration isolation pads are arranged at the assembly connection between the upper and lower expansion plates and the external substrate.

[0014] A further improvement of the present invention is that the particle damper consists of a cavity shell and a sealing cover plate, the cavity shell is filled with tungsten powder particles, and then the sealing cover plate is fastened to the cavity shell by bolts, and the damping dissipation effects such as friction and collision between the tungsten powder particles in the particle damper cavity are utilized to achieve effective broadband attenuation of high-frequency vibration energy in the cylinder device.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: 1. Attach the vibration absorbing supercell and particle damper to the appropriate positions of the outer surface of the piston rod, left cylinder body, middle cylinder body and right cylinder body of the oil cylinder device respectively, and install the metal rubber vibration isolation pad at the assembly connection between the upper and lower exhibition boards of the oil cylinder device and the external matrix, so as to effectively attenuate the low-medium-high full-band vibration energy and impact vibration energy of the oil cylinder device; 2. The thin plate structure of the vibration-absorbing superstructure unit in the vibration-absorbing supercell adopts a double-helix slit structure with low stiffness characteristics, which can obtain elastic wave band gaps in the lower frequency band. According to the modal vibration displacement cloud diagram of the cylinder device, by attaching the vibration-absorbing supercell to the outer surface of the area where the low-frequency vibration energy is more concentrated, the low-frequency vibration energy of the cylinder device can be effectively transferred and absorbed. At the same time, the vibration-absorbing superstructure unit also has strong design flexibility, and the vibration reduction band gap characteristics can be directly adjusted by adjusting its geometric parameters; 3. A certain amount of tungsten powder particles are filled in the cavity shell of the particle damper. The rich friction, collision and other interactions between the tungsten powder particles make the damper have excellent high damping dissipation characteristics. According to the modal vibration displacement cloud map of the cylinder device, by attaching the particle damper to the outer surface of the area where the medium and high frequency vibration energy is more concentrated, the medium and high frequency vibration energy of the cylinder device can be effectively dissipated and attenuated; 4. The metal rubber vibration isolation pad is made of fine and soft stainless steel wires according to a certain weaving density. There are certain deformation gaps between the stainless steel wires. The interaction between the tensile and compressive deformation, extrusion friction and other forms between the stainless steel wires makes the metal rubber vibration isolation pad have excellent damping and buffering capabilities. By arranging and installing the metal rubber vibration isolation pad at the assembly connection between the oil cylinder device and the external matrix, the impact vibration energy of the oil cylinder device can be effectively buffered and dissipated; 5. The vibration reduction design strategy for the oil cylinder device provided by the present invention, the vibration absorbing supercell, particle damper and metal rubber vibration isolation pad used are all installed by external attachment, without the need to disassemble or modify the original oil cylinder device, and does not affect the air tightness and normal working process of the oil cylinder device, and is easy to use and efficient; 6. The vibration reduction design strategy for the oil cylinder device provided by the present invention uses all vibration reduction devices made of pure metal materials, which can effectively overcome the defects of conventional viscoelastic materials in terms of high temperature resistance, durability, corrosion resistance, etc., and meet the environmental adaptability requirements of the oil cylinder device in actual harsh working conditions; 7. Through the synergistic combination of low-frequency vibration absorption technology, medium- and high-frequency vibration resistance technology, and buffer vibration isolation technology, the beneficial effects of various vibration reduction technologies can be effectively superimposed, and the low-medium-high full-frequency vibration energy and impact vibration energy of the cylinder device can be effectively attenuated.

[0016] In summary, according to the above characteristics of a design method for vibration reduction of a display panel type hydraulic cylinder provided by the present invention, the vibration reduction design strategy provided by the present invention can achieve effective attenuation of low-medium-high full-band vibration energy and impact vibration energy of the cylinder device. This vibration reduction design strategy is to obtain the final excellent vibration reduction effect through the synergistic combination of vibration absorption technology, vibration damping technology and vibration isolation technology. The vibration absorption technology is realized by a vibration absorption supercell structure, and the low-frequency elastic wave band gap of the vibration absorption superstructure unit in the vibration absorption supercell can be used to achieve efficient fixed-point absorption of low-frequency vibration energy. The vibration damping technology is realized by a particle damper, and the collision, friction and other interactions of tungsten powder particles in the damper can be used to achieve effective broadband dissipation of medium and high frequency vibration energy. The vibration isolation technology is realized by a metal rubber vibration isolation pad, and the tensile and compressive deformation, extrusion friction and other interactions between stainless steel wires in the metal rubber vibration isolation pad can be used to achieve effective buffering and absorption of impact vibration energy. The vibration reduction devices used in the above three vibration reduction technologies are all designed with pure metal materials, which can effectively overcome the defects of conventional viscoelastic materials in terms of high temperature resistance, durability, corrosion resistance, etc., and meet the environmental adaptability requirements of the actual harsh working conditions of the cylinder device. In summary, compared with the existing vibration reduction strategies, this vibration reduction design strategy has significantly improved environmental adaptability, and at the same time, it shows excellent attenuation effects on low-medium-high full-band vibration energy and impact vibration energy, which can well meet the application requirements of the actual cylinder device for vibration reduction effect and reliable environmental adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the model of the display panel type hydraulic cylinder; Figure 2 The schematic diagram of the model of vibration absorbing supercell, particle damper and metal rubber vibration isolation pad; Figure 3 The first four modal vibration diagrams of the panel-type hydraulic cylinder; Figure 4a The geometric model and energy band dispersion curve diagram of the S1 and S2 vibration-absorbing superstructure units; Figure 4b The variation law of band gap characteristics of the double helical slit structure vibration absorption unit under the adjustment of three geometric parameters; Figure 5a It is a schematic diagram of the arrangement scheme for reducing vibration of the first-order resonance mode of the display panel type hydraulic cylinder; Figure 5b It is a schematic diagram of the vibration attenuation effect of the first-order resonance energy of the display plate type hydraulic cylinder; Figure 6 It is a schematic diagram of the vibration attenuation effect of the second-order resonance energy of the display plate type hydraulic cylinder; Figure 7a It is a schematic diagram of the arrangement scheme for reducing vibration of the third-order resonance mode of the display panel type hydraulic cylinder; Figure 7b It is a schematic diagram of the vibration attenuation effect of the third-order resonance energy of the display plate type hydraulic cylinder; Figure 8a It is a schematic diagram of the arrangement scheme for reducing vibrations for the fourth-order resonance mode of the display panel type hydraulic cylinder; Figure 8b It is a schematic diagram of the vibration attenuation effect of the fourth-order resonance energy of the display plate type hydraulic cylinder; Figure 9a This is the experimental test result of the oil cylinder device under the condition of oil inlet pressure of 7.5MPa; Figure 9b These are the experimental test results of the cylinder device under the condition of oil inlet pressure of 12MPa. DETAILED DESCRIPTION

[0018] The technical scheme in the implementation case of the present invention is described below in conjunction with the relevant calculation and measurement results of the implementation case of the present invention in the accompanying drawings. Obviously, the implementation case described is only a part of the implementation case of the present invention, not all the implementation cases. Based on the implementation case in the present invention, all other implementation cases obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0019] Example 1 The present invention provides a design method for vibration reduction of a display panel type hydraulic cylinder, comprising the following steps: 1) Import the three-dimensional model of the display panel hydraulic cylinder device into COMSOL Multiphysics finite element software for modal analysis. According to the resonance modal displacement cloud map of the cylinder device, determine the concentrated area of ​​its vibration energy, vibration displacement direction and resonance peak frequency; 2) According to the value of the resonance peak frequency in step 1), an appropriate form of local resonance vibration absorption superstructure unit is selected, and a support frame for supporting the vibration absorption unit is designed; 3) Adjust the geometric design parameters of the vibration absorption unit, calculate the energy band dispersion curves and modal vibration diagrams of each order of the vibration absorption unit, determine the local resonance band gap frequency range and band gap type of the unit, so that the target resonance peak frequency falls within the band gap range of the unit, and at the same time, the band gap type of the vibration absorption unit can achieve the vibration reduction effect on the target vibration mode; 4) According to the vibration energy concentration area in step 1) and the vibration displacement direction therein, the adjusted vibration absorption unit is combined with the support frame to form a vibration absorption supercell, and the vibration absorption supercell is attached to the outer surface of the vibration energy concentration area at the corresponding resonance frequency, and the vibration displacement direction is kept consistent with the out-of-plane vibration direction of the "spring-mass" system of the vibration absorption supercell; 5) According to the resonance peak frequency value of step 1) and the corresponding vibration energy concentration area, when the resonance peak frequency is in the medium and high frequency range, the outer surface configuration of the cylinder device in the vibration energy concentration area is considered, and a particle damper is designed and prepared based on the conformal matching design concept, and attached to the outer surface of the medium and high frequency vibration energy concentration area; 6) Considering the assembly connection between the display panels on both sides of the cylinder device and the external matrix, design the metal rubber vibration isolation pad; 7) Prepare metal rubber vibration isolation pads and arrange them at the contact points between the display panels on both sides of the cylinder device and the external matrix, and connect the display panels on both sides of the cylinder, the metal rubber vibration isolation pads and the external matrix; 8) After the additional arrangement of vibration-absorbing supercells, particle dampers and metal rubber vibration isolation pads is completed, simulation calculations are carried out and vibration experiments are carried out to verify the vibration reduction effect under the synergistic effect of multiple vibration reduction technologies.

[0020] In this embodiment, according to the modal analysis results of the oil cylinder device, the vibration absorbing supercell and the particle damper are attached to the outer surface positions of the piston rod (1), the left cylinder body (3), the middle cylinder body (4) and the right cylinder body (6), and the metal rubber vibration isolation pad is arranged at the assembly connection between the upper expansion plate (5) and the lower expansion plate (8) and the external base.

[0021] In the present embodiment, the vibration absorbing supercell is composed of a vibration absorbing superstructure unit (9) and a support frame (10). The vibration absorbing superstructure unit (9) works based on the principle of local resonance and comprises a cylindrical mass body (11) providing concentrated mass, a thin plate (12) providing rigidity, and a frame (13) providing support. A circular hole is processed at the center of the thin plate (12) to split the cylindrical mass body (11) into an upper and lower part. The upper part extends a section of external thread, and the lower part is processed with a section of internal thread. The external thread of the upper part passes through the central circular hole of the thin plate (12) and is connected to the internal thread of the lower part, thereby realizing the assembly of the cylindrical mass body (11) and the thin plate (12). The support frame (10) is connected to the thin plate (12) at the outer edge position by spot welding or gluing. The support frame (10) also adopts the equipment matching coinform design concept and performs customized appearance design according to the structural characteristics of the cylinder device at the attached position to ensure that the support frame and the cylinder device can be smoothly matched and attached.

[0022] In this embodiment, the thin plate structure (12) of the vibration absorbing superstructure unit (9) is constructed by double-helix slit grooving. This type of thin plate structure (12) in the form of a double-helix slit structure can obtain lower stiffness characteristics and can achieve effective attenuation of low-frequency vibration energy.

[0023] In this embodiment, the particle damper is composed of a cavity shell (14) and a sealing cover plate (15), wherein the cavity shell (14) is filled with tungsten powder particles, and then the sealing cover plate (15) is fastened to the cavity shell by bolt connection, and the damping dissipation effects such as friction and collision between the tungsten powder particles in the particle damper cavity can be utilized to achieve effective broadband attenuation of high-frequency vibration energy in the cylinder device.

[0024] In this embodiment, the metal rubber vibration isolation pad is woven from 316 stainless steel wire according to set wire diameter requirements and weaving density requirements. The specific structural shape of the metal rubber vibration isolation pad is determined according to its installation layout position. When designing the structure of the metal rubber vibration isolation pad, it is necessary to perform drilling according to the installation bolt positions of the upper display plate (5) and the lower display plate (8) of the cylinder device.

[0025] By utilizing the interaction between the tensile and compressive deformation, extrusion friction and other forms of interaction between the metal wires inside the metal rubber vibration isolation pad, it is possible to obtain excellent high damping buffering and dissipation capacity, and effectively absorb and attenuate the impact vibration energy.

[0026] The vibration-absorbing supercells, particle dampers and metal rubber vibration isolation pads used all work by external attachment, and there is no need to modify or disassemble the structure of the cylinder device itself. The design strategy has low application difficulty and high efficiency.

[0027] The vibration reduction devices used are all made of pure metal materials, which can meet the requirements of the actual engineering environment for the durability, stability and environmental adaptability of the additional devices.

[0028] By combining the low-frequency vibration absorption technology, medium- and high-frequency vibration damping technology, and buffering vibration isolation technology, the beneficial effects of various vibration reduction technologies can be effectively superimposed to achieve effective attenuation of the low-medium-high full-frequency vibration energy and impact vibration energy of the cylinder device.

[0029] Example 2 The present invention provides a design device for vibration reduction of a display panel type hydraulic cylinder, comprising: The first determination module imports the three-dimensional model of the display panel hydraulic cylinder device into the COMSOL Multiphysics finite element software for modal analysis, and determines the concentrated area of ​​vibration energy, vibration displacement direction and resonance peak frequency of the cylinder device according to the resonance modal displacement cloud map; The first design module selects the local resonance vibration absorption superstructure unit according to the resonance peak frequency value, and designs the support frame for supporting the vibration absorption unit; The second determination module adjusts the geometric design parameters of the vibration absorbing unit, calculates the energy band dispersion curves and modal vibration shape diagrams of each order of the vibration absorbing unit, and determines the local resonance band gap frequency range and band gap type of the unit, so that the target resonance peak frequency falls within the band gap range of the unit, and at the same time the band gap type of the vibration absorbing unit can achieve a vibration reduction effect on the target vibration mode; Combination module: According to the vibration energy concentration area and the vibration displacement direction there, the adjusted vibration absorption unit is combined with the support frame to form a vibration absorption supercell, and the vibration absorption supercell is attached to the outer surface of the vibration energy concentration area at the corresponding resonance frequency, and the vibration displacement direction is kept consistent with the out-of-plane vibration direction of the "spring-mass" system of the vibration absorption supercell; The additional module is based on the resonance peak frequency value and the corresponding vibration energy concentration area. When the resonance peak frequency is in the medium and high frequency range above 500 Hz, the outer surface configuration of the cylinder device in the vibration energy concentration area is considered, and the particle damper is designed and prepared based on the conformal matching design concept, and attached to the outer surface of the medium and high frequency vibration energy concentration area; The second design module considers the assembly connection between the display panels on both sides of the cylinder device and the external matrix, and designs the metal rubber vibration isolation pad; Connecting module, prepare metal rubber vibration isolation pads, and arrange them at the contact connection between the display panels on both sides of the cylinder device and the external matrix, and connect the display panels on both sides of the cylinder, the metal rubber vibration isolation pads and the external matrix; After the inspection module, vibration-absorbing supercells, particle dampers and metal rubber vibration isolation pads are additionally arranged, simulation calculations are carried out and vibration experiments are carried out to verify the vibration reduction effect under the synergistic effect of multiple vibration reduction technologies.

[0030] Example 3 1. Simulation of the attenuation effect of cylinder vibration energy under the synergistic effect of multiple vibration reduction technologies For the attached Figure 1 The external visible structure of the hydraulic cylinder shown in the figure mainly includes piston rod 1, left end cover 2, left cylinder body 3, middle cylinder body 4, right cylinder body 6, right end cover 7, upper display board 5 and lower display board 8. The three-dimensional model of the cylinder is imported into the commercial finite element software COMSOL Multiphysics 5.6 for resonance modal analysis and calculation. In order to reasonably optimize the difficulty of simulation calculation, some minor detail structures of the imported model are simplified, such as ignoring some small bolt structures and gasket structures that will not affect the vibration characteristics of the main structure. The modal vibration shape results of the equivalent model of the cylinder device calculated are shown in the attached figure. Figure 3 Attached Figure 3The first four resonant modal vibration modes of the oil cylinder structure below 1000Hz are shown. The colors on the displacement cloud map of each modal vibration mode change from blue to red, indicating that the concentration of vibration energy gradually increases. The black arrows at each point on the oil cylinder structure point to the vibration direction at that position. According to the displacement cloud map of the modal vibration mode of the oil cylinder structure, it can be clearly observed that the vibration energy concentration distribution area and the main vibration form of the oil cylinder structure when each order of resonance occurs. For example, for the first order resonance of the oil cylinder structure at 308.6Hz, the vibration energy is mainly concentrated at the left end of the piston rod, and the main vibration form is as follows: x Bending vibration.

[0031] Here, the vibration reduction design of the first 4 resonant modes of the cylinder structure is taken as an implementation case. First, for the first 4 resonant frequencies of 308.6Hz, 314.5Hz, 848.2Hz and 922.8Hz, customized designs are made for the S1 vibration-absorbing superstructure unit with a bending wave band gap range of 217.2Hz-403.5Hz and the S2 vibration-absorbing superstructure unit with a bending wave band gap range of 649.9Hz-1127.0Hz. The S1 unit can effectively attenuate the first-order resonance energy and the second-order resonance energy of the cylinder structure, and the S2 unit can effectively attenuate the third-order resonance energy and the fourth-order resonance energy of the cylinder structure. The geometric structure forms of the S1 unit and the S2 unit and their energy band dispersion curves are shown in the attached figure. Figure 4a As shown, attached Figure 4a The shaded area in the middle represents the bending wave band gap range of the two types of units. Figure 4a As shown in the figure, the black frame and cyan thin plate structure of the vibration absorption unit are made of aluminum alloy, and the gray cylindrical mass block is made of stainless steel. In addition, this type of vibration absorption superstructure unit in the form of a double-helix slit structure has flexible bandgap adjustability. By adjusting its geometric design parameters, its bandgap frequency band can be customized to meet the vibration reduction requirements of different actual working conditions for different action frequency bands. Figure 4b As shown, the flexible adjustability of the band gap range of this type of vibration-absorbing unit under adjustment of three different design parameters is demonstrated.

[0032] By observing the Figure 3The vibration energy distribution of the oil cylinder structure shown in the figure shows that the medium and high frequency vibration energy, including the third-order vibration energy and the fourth-order vibration energy, is mainly concentrated in the piston rod, the left and right cylinders and the middle cylinder. To this end, based on the equipment matching conformal design concept, a metal particle damper that can be matched and assembled with the left and right cylinders and the middle cylinder is designed. The damper shell is made of stainless steel, and its inner cavity is filled with high-purity tungsten powder particles with a diameter of 10 microns. The oil cylinder structure is assembled and connected with the external matrix through the upper and lower display panels. In order to effectively attenuate the impact vibration energy of the oil cylinder structure, a metal rubber vibration isolation pad is placed at the assembly contact position of the upper and lower display panels and the external matrix. The vibration isolation pad is made of stainless steel wire with a certain wire diameter according to the specified weaving density, and there is a set porosity between the internal metal wires. By using the extrusion deformation and friction collision of the metal wire inside the vibration isolation pad, the impact vibration energy of the oil cylinder device can be effectively buffered and dissipated.

[0033] The above is a detailed discussion of the three vibration reduction technologies included in this vibration reduction design strategy. Next, the specific vibration reduction effect that this vibration reduction design strategy can achieve for the cylinder structure is shown. For the first-order resonance mode of the cylinder structure, the resonance frequency is 308.6Hz, the vibration energy is mainly distributed at the left end of the piston rod, and the vibration form is mainly manifested as follows: x To this end, a vibration absorbing supercell containing 4 S1 vibration absorbing units is added to the left end of the piston rod where the vibration energy is more concentrated. Figure 5a The vibration spectrum of the cylinder structure before and after the addition of the vibration absorbing supercell is shown in the attached figure. Figure 5b As shown in the figure, the black solid line is the vibration spectrum of the cylinder structure before the vibration absorption supercell is added, and the cyan solid line is the vibration spectrum of the cylinder structure after the vibration absorption supercell is added. It can be found that after the vibration absorption supercell is added, the acceleration peak of the cylinder structure at the original first-order resonance frequency of 308.4Hz is increased from 10.3m / s 2 Reduced to 8.0m / s 2 , the vibration amplitude is attenuated by about 22.3%, and the additional vibration-absorbing supercell shows an obvious attenuation effect on the first-order resonance energy of the cylinder structure.

[0034] For the second-order resonance mode of the cylinder structure, its vibration characteristics are basically the same as the first-order resonance mode. Therefore, the treatment method for the second-order resonance mode is the same as the first-order resonance mode, that is, a vibration absorption supercell containing 4 S1 vibration absorption units is added to the left end of the piston rod. The vibration spectrum of the cylinder structure before and after the addition of the vibration absorption supercell is calculated as shown in the attached figure. Figure 6 As shown in Figure 2, the attenuation effect of the vibration-absorbing supercell on the second-order resonance energy is basically the same as that on the first-order, and the peak acceleration is reduced from the original 10.6 m / s 2 Attenuation: 8.2m / s 2 , the amplitude attenuation is about 22.6%.

[0035] For the third-order resonance mode of the oil cylinder structure, the vibration energy is not only concentrated on the left and right ends of the piston rod, but also concentrated on the left and right cylinder bodies and the middle cylinder body of the oil cylinder. To this end, firstly, a vibration absorption supercell containing an S2 vibration absorption unit is added to the two ends of the piston rod, the left and right cylinder bodies and the middle cylinder body of the oil cylinder. In view of the fact that the third-order resonance frequency of 848.2Hz is in the mid-to-high frequency band above 500Hz, a metal particle damper is additionally added to the middle cylinder body to achieve effective attenuation of the vibration energy in the mid-to-high frequency band, such as the attached Figure 7a The vibration spectrum of the cylinder structure before and after the additional vibration reduction device is calculated as shown in the attached figure. Figure 7b As shown in the figure, it can be seen that after adding the vibration absorbing supercell and particle damper, the peak value of the vibration acceleration of the cylinder structure is reduced from the original 1.08m / s 2 Attenuation: 0.82m / s 2 , the vibration amplitude attenuation degree is about 24.1%. The vibration energy distribution and aggregation of the fourth-order resonance mode of the oil cylinder structure is basically the same as that of the third-order resonance mode. Therefore, the treatment method for the fourth-order resonance mode is similar to that of the third-order resonance mode, that is, vibration absorbing supercells containing S2 vibration absorbing units are added to the left and right ends of the piston rod, the left and right cylinders and the middle cylinder, and metal particle dampers are added to the left cylinder and the middle cylinder. The layout and installation diagram of the relevant devices is shown in the attached figure. Figure 8a The vibration spectrum of the cylinder structure before and after the additional vibration reduction device is calculated as shown in the attached figure. Figure 8b It can be seen that after adding the relevant vibration reduction device, the vibration acceleration peak value of the cylinder structure has dropped significantly from the original 0.34m / s 2 Reduced to 0.23m / s 2 , the vibration amplitude attenuation degree is about 32.4%.

[0036] 2. Experimental test on the attenuation effect of cylinder vibration energy under the synergistic effect of multiple vibration reduction technologies In this case, an acceleration sensor was attached to the middle position of the upper end surface of the upper display panel 5, and vibration reduction performance test experiments were carried out under two working conditions with oil inlet pressures of 7.5 MPa and 12 MPa respectively.

[0037] The vibration reduction performance test results under the condition of oil inlet pressure of 7.5MPa are shown in the attached Figure 9aAs shown, it can be seen that the vibration reduction experimental group can almost achieve a significant attenuation effect on the vibration energy of the entire frequency band below 1000Hz. The average amplitude in the 200Hz-300Hz frequency band is attenuated by about 55%, and the average amplitude in the 400Hz-1000Hz frequency band is attenuated by about 40%. Among them, the normalized acceleration amplitude at the resonance peak near 270Hz is reduced from 0.91 in the control group to 0.34 in the experimental group, and the vibration energy attenuation amplitude exceeds 62.6%, and the vibration reduction effect is very obvious.

[0038] The vibration reduction performance test results under the condition of oil inlet pressure of 12MPa are shown in the attached figure. Figure 9b As shown in the figure, the vibration reduction experimental group can show obvious attenuation effect on vibration energy in a wide frequency band of 150Hz-1000Hz. The average amplitude attenuation in the 200Hz-300Hz frequency band is about 46%, the average amplitude attenuation in the 300Hz-500Hz frequency band is about 68%, and the average amplitude attenuation in the 500Hz-1000Hz frequency band is about 54%. Among them, the normalized acceleration amplitude at the resonance peak near 400Hz is reduced from 0.23 in the control group to 0.06 in the experimental group, and the vibration energy attenuation amplitude exceeds 73.9%, and the vibration reduction effect is very significant.

[0039] According to the above data, it can be seen that the technical effects that the present invention can achieve are as follows: 1. According to the calculation results of the modal vibration type of the oil cylinder structure, by arranging the vibration absorbing supercell, particle damper and metal rubber vibration isolation pad at appropriate positions outside the oil cylinder device, the effective superposition of the beneficial effects of various vibration reduction technologies can be achieved, and finally the low-medium-high full-band vibration energy and impact vibration energy of the oil cylinder device can be effectively attenuated; 2. The vibration-absorbing superstructure unit in the form of a double-helix slit structure used in the vibration-absorbing supercell has a special subwavelength characteristic. Its elastic wave band gap characteristics can effectively attenuate low-frequency vibration energy. For example, the vibration-absorbing supercell can achieve an attenuation effect of about 22.3% of the first-order resonance energy of the cylinder structure and an attenuation effect of about 22.6% of the second-order resonance energy. At the same time, the band gap frequency band of the superstructure vibration-absorbing unit has a flexible and adjustable design. The customized design of the band gap characteristics of the vibration-absorbing unit can be achieved by adjusting the unit geometric design parameters; 3. Vibration damping technology and vibration isolation technology are realized by metal particle dampers and metal rubber vibration isolation pads respectively. By combining the two types of structures with vibration absorption supercells, effective attenuation of vibration energy in a wider frequency band can be achieved on the basis of the fixed-point narrow-band vibration reduction effect achieved by the vibration absorption supercell. For example, the synergistic effect of multiple vibration reduction technologies can achieve significant attenuation of the fourth-order resonance energy of the cylinder structure. This attenuation effect is not only reflected in the 32.4% decrease in the vibration peak value, but also in the significant reduction in the vibration amplitude of the cylinder device in the wider frequency band of 900Hz-1100Hz, achieving a wide-band and high-amplitude attenuation effect on the vibration energy of the cylinder device; 4. The three vibration reduction technologies involved in this vibration reduction design strategy are all installed by external attachment, without disassembling or modifying the structure of the cylinder device itself. They are easy to use and install, with high working efficiency and do not affect the normal working process of the cylinder device. In addition, the vibration reduction devices used are all made of pure metal, which meets the stringent requirements of environmental adaptability in actual harsh working conditions.

[0040] In summary, according to the above characteristics of a design method for vibration reduction of a display panel type hydraulic cylinder provided by the present invention, the vibration reduction design strategy provided by the present invention can achieve effective attenuation of the low-medium-high full-band vibration energy and impact vibration energy of the cylinder device through the synergistic combination of multiple vibration reduction technologies without disassembling or modifying the original cylinder device. The vibration absorption technology is realized by a local resonance vibration absorption superstructure unit, and its subwavelength characteristics and elastic wave band gap characteristics can be used to achieve efficient fixed-point attenuation of low-frequency vibration energy. The vibration damping technology is realized by a metal particle damping device, and the friction and collision between tungsten powder particles can be used to achieve effective broadband dissipation of medium and high frequency vibration energy. The vibration isolation technology is realized by a metal rubber vibration isolation pad, and the extrusion and stretching deformation of the metal wire inside the vibration isolation pad and the mutual friction and collision can achieve effective buffering and absorption of impact vibration energy. In summary, compared with the existing single damping material vibration reduction scheme, this vibration reduction design strategy that coordinates multiple vibration reduction technologies has significantly improved the vibration energy attenuation capability and greatly broadened the frequency band of vibration reduction action. At the same time, the pure metal design makes the vibration reduction device have excellent environmental adaptability, which can well meet the comprehensive application requirements of actual engineering for vibration reduction effect and reliable adaptability.

[0041] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0042] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A design method for vibration reduction of a display panel type hydraulic cylinder, characterized in that: The following steps are involved: 1) Import the three-dimensional model of the display panel hydraulic cylinder device into COMSOL Multiphysics finite element software for modal analysis. According to the resonance modal displacement cloud map of the cylinder device, determine the concentrated area of ​​its vibration energy, vibration displacement direction and resonance peak frequency; 2) According to the value of the resonance peak frequency, select the local resonance vibration absorption superstructure unit, and design the support frame for supporting the vibration absorption unit; 3) Adjust the geometric design parameters of the vibration absorption unit, calculate the energy band dispersion curves and modal vibration diagrams of each order of the vibration absorption unit, determine the local resonance band gap frequency range and band gap type of the unit, so that the target resonance peak frequency falls within the band gap range of the unit, and at the same time, the band gap type of the vibration absorption unit can achieve the vibration reduction effect on the target vibration mode; 4) According to the vibration energy concentration area and the vibration displacement direction there, the adjusted vibration absorption unit is combined with the support frame to form a vibration absorption supercell, and the vibration absorption supercell is attached to the outer surface of the vibration energy concentration area at the corresponding resonance frequency, and the vibration displacement direction is kept consistent with the out-of-plane vibration direction of the vibration absorption supercell "spring-mass" system; 5) According to the resonance peak frequency value and the corresponding vibration energy concentration area, when the resonance peak frequency is in the medium and high frequency range above 500 Hz, the outer surface configuration of the cylinder device in the vibration energy concentration area is considered, and the particle damper is designed and prepared based on the conformal matching design concept, and attached to the outer surface of the medium and high frequency vibration energy concentration area; 6) Considering the assembly connection between the display panels on both sides of the cylinder device and the external matrix, design the metal rubber vibration isolation pad; 7) Prepare metal rubber vibration isolation pads and arrange them at the contact points between the display panels on both sides of the cylinder device and the external matrix, and connect the display panels on both sides of the cylinder, the metal rubber vibration isolation pads and the external matrix; 8) After the additional arrangement of vibration-absorbing supercells, particle dampers and metal rubber vibration isolation pads is completed, simulation calculations are carried out and vibration experiments are carried out to verify the vibration reduction effect under the synergistic effect of multiple vibration reduction technologies.

2. A design method for vibration reduction of a display panel type hydraulic cylinder according to claim 1, characterized in that: According to the modal analysis results of the oil cylinder device, the vibration absorbing supercell and the particle damper are attached to the outer surface positions of the piston rod (1), the left cylinder body (3), the middle cylinder body (4) and the right cylinder body (6), and the metal rubber vibration isolation pad is arranged at the assembly connection between the upper expansion plate (5) and the lower expansion plate (8) and the external base.

3. A design method for vibration reduction of a display panel type hydraulic cylinder according to claim 1, characterized in that: The vibration absorbing supercell is composed of a vibration absorbing superstructure unit (9) and a support frame (10). The vibration absorbing superstructure unit (9) works based on the principle of local resonance and comprises a cylindrical mass body (11) providing concentrated mass, a thin plate (12) providing rigidity, and a frame (13) providing support. A circular hole is processed at the center of the thin plate (12) to split the cylindrical mass body (11) into an upper and lower part. The upper part extends a section of external thread, and the lower part is processed with a section of internal thread. The external thread of the upper part passes through the central circular hole of the thin plate (12) and is connected to the internal thread of the lower part, thereby realizing the assembly combination of the cylindrical mass body (11) and the thin plate (12). The support frame (10) is connected and combined with the thin plate (12) at the outer edge position by spot welding or gluing. The support frame (10) also adopts the equipment matching coinform design concept and performs customized appearance design according to the structural characteristics of the cylinder device at the attached position to ensure that the support frame and the cylinder device can be smoothly matched and attached.

4. A design method for vibration reduction of a display panel type hydraulic cylinder according to claim 3, characterized in that: The thin plate structure (12) of the vibration absorbing superstructure unit (9) is constructed by digging grooves in a double-helix slit pattern. Such a thin plate structure (12) in the form of a double-helix slit structure can obtain lower stiffness characteristics and can achieve effective attenuation of low-frequency vibration energy.

5. The design method for vibration reduction of a display panel type hydraulic cylinder according to claim 1 is characterized in that: The particle damper is composed of a cavity shell (14) and a sealing cover plate (15). The cavity shell (14) is filled with tungsten powder particles, and the sealing cover plate (15) is then fastened to the cavity shell by bolt connection. By utilizing the damping and dissipation effects such as friction and collision between the tungsten powder particles in the particle damper cavity, effective broadband attenuation of high-frequency vibration energy in the oil cylinder device can be achieved.

6. A design method for vibration reduction of a display panel type hydraulic cylinder according to claim 1, characterized in that: The metal rubber vibration isolation pad is made of 316 stainless steel wire according to the set wire diameter and weaving density requirements.

7. The design method for vibration reduction of a hydraulic cylinder with a display panel according to claim 1 is characterized in that: The specific structural shape of the metal rubber vibration isolation pad is determined according to its installation layout position, and the holes are punched according to the installation bolt positions of the upper display plate (5) and the lower display plate (8) of the oil cylinder device.

8. A design device for vibration reduction of a hydraulic cylinder with a display panel, characterized in that: include: The first determination module imports the three-dimensional model of the display panel hydraulic cylinder device into the COMSOL Multiphysics finite element software for modal analysis, and determines the concentrated area of ​​vibration energy, vibration displacement direction and resonance peak frequency of the cylinder device according to the resonance modal displacement cloud map; The first design module selects the local resonance vibration absorption superstructure unit according to the resonance peak frequency value, and designs the support frame for supporting the vibration absorption unit; The second determination module adjusts the geometric design parameters of the vibration absorbing unit, calculates the energy band dispersion curves and modal vibration shape diagrams of each order of the vibration absorbing unit, and determines the local resonance band gap frequency range and band gap type of the unit, so that the target resonance peak frequency falls within the band gap range of the unit, and at the same time the band gap type of the vibration absorbing unit can achieve a vibration reduction effect on the target vibration mode; Combination module: According to the vibration energy concentration area and the vibration displacement direction there, the adjusted vibration absorption unit is combined with the support frame to form a vibration absorption supercell, and the vibration absorption supercell is attached to the outer surface of the vibration energy concentration area at the corresponding resonance frequency, and the vibration displacement direction is kept consistent with the out-of-plane vibration direction of the vibration absorption supercell "spring-mass" system; The additional module is based on the resonance peak frequency value and the corresponding vibration energy concentration area. When the resonance peak frequency is in the medium and high frequency range above 500 Hz, the outer surface configuration of the cylinder device in the vibration energy concentration area is considered, and the particle damper is designed and prepared based on the conformal matching design concept, and attached to the outer surface of the medium and high frequency vibration energy concentration area; The second design module considers the assembly connection between the display panels on both sides of the cylinder device and the external matrix, and designs the metal rubber vibration isolation pad; Connecting module, prepare metal rubber vibration isolation pads, and arrange them at the contact connection between the display panels on both sides of the cylinder device and the external matrix, and connect the display panels on both sides of the cylinder, the metal rubber vibration isolation pads and the external matrix; After the inspection module, vibration-absorbing supercells, particle dampers and metal rubber vibration isolation pads are additionally arranged, simulation calculations are carried out and vibration experiments are carried out to verify the vibration reduction effect under the synergistic effect of multiple vibration reduction technologies.

9. A design device for vibration reduction of a hydraulic cylinder with a display panel according to claim 8, characterized in that: According to the modal analysis results of the oil cylinder device, the vibration absorbing supercell and the particle damper are attached to the outer surface positions of the piston rod (1), the left cylinder body (3), the middle cylinder body (4) and the right cylinder body (6), and the metal rubber vibration isolation pad is arranged at the assembly connection between the upper expansion plate (5) and the lower expansion plate (8) and the external base.

10. A design device for vibration reduction of a hydraulic cylinder with a display panel according to claim 8, characterized in that: The particle damper is composed of a cavity shell (14) and a sealing cover plate (15). The cavity shell (14) is filled with tungsten powder particles, and the sealing cover plate (15) is then fastened to the cavity shell by bolt connection. By utilizing the damping and dissipation effects such as friction and collision between the tungsten powder particles in the particle damper cavity, effective broadband attenuation of high-frequency vibration energy in the oil cylinder device can be achieved.

Images