Disclosure of Invention
The invention provides a three-way corrugated honeycomb sound insulation vibration isolator and a design method thereof, which are used for solving the problem that the traditional hexagonal honeycomb structure and negative poisson ratio structure in the prior art are difficult to meet vibration isolation and sound insulation performance indexes, and can effectively reduce the out-of-plane rigidity, so that the three-way corrugated honeycomb sound insulation vibration isolator can respectively absorb part of vibration energy in three directions, can realize vibration isolation in a low-frequency range in three directions, and effectively improve vibration isolation performance.
The invention provides a three-way corrugated honeycomb sound insulation vibration isolator, which comprises the following components:
A plurality of negative poisson ratio cells which are periodically arranged in the same plane along the transverse direction and the longitudinal direction to form a three-dimensional honeycomb structure;
In a vertical direction perpendicular to the plane, the walls of the negative poisson's ratio cells exhibit a periodic ripple structure.
The cell walls of the negative poisson ratio cell comprise a pair of transverse cell walls extending along the transverse direction and arranged at intervals along the longitudinal direction and a pair of longitudinal cell walls extending along the longitudinal direction and arranged at intervals along the transverse direction;
The transverse cell walls and the longitudinal cell walls are sequentially connected to form a closed structure, and the longitudinal cell walls are bent towards the inner side of the negative poisson ratio cell.
According to the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention, the longitudinal cell walls comprise a pair of inclined plates, one ends of the pair of inclined plates, which are away from each other, are respectively connected with the pair of transverse cell walls, and the corresponding ends of the pair of inclined plates are inclined towards the inner side of the negative poisson ratio cell and are connected with each other.
According to the three-dimensional corrugated honeycomb sound insulation vibration isolator provided by the invention, the three-dimensional honeycomb structure is integrally formed by adopting an aluminum alloy material.
According to the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention, holes are formed in the transverse cell walls and/or the longitudinal cell walls.
According to the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention, the holes are arranged on the transverse cell wall and/or the longitudinal cell wall.
According to the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention, the holes are uniformly distributed.
The design method of the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention comprises the following steps of:
constructing a natural frequency prediction model of the vibration isolator;
Obtaining predicted structural parameters of the vibration isolator based on the natural frequency prediction model of the vibration isolator and the weight and target frequency of an object to be vibration isolated;
And carrying out simulation check based on the predicted structural parameters, and obtaining final structural parameters of the vibration isolator when the simulation result meets the requirements.
According to the design method of the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention, the construction of the natural frequency prediction model of the vibration isolator comprises the following steps:
determining a plurality of influencing factors influencing the natural frequency of the vibration isolator;
Systematically evaluating the influence of different horizontal combinations of a plurality of the influence factors on the natural frequency of the vibration isolator through orthogonal experiments;
And determining an optimal horizontal combination scheme based on an orthogonal experiment result, and constructing a natural frequency prediction model of the vibration isolator according to the optimal horizontal combination scheme.
According to the design method of the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention, influence factors include, but are not limited to, corrugated period, corrugated amplitude, structural wall thickness, negative poisson's ratio structural side length, integral width, integral height and weight.
According to the design method of the three-way corrugated honeycomb sound insulation vibration isolator, after the final structural parameters of the vibration isolator are obtained, the method further comprises the following steps of manufacturing the vibration isolator based on the final structural parameters, wherein a honeycomb structure is made of aluminum alloy materials and integrally formed by utilizing a 3D printing technology, holes are drilled in cell walls of the honeycomb structure after the honeycomb structure is formed, and finally the three-way corrugated honeycomb sound insulation vibration isolator is formed.
The beneficial effects are that:
1. The three-way corrugated honeycomb sound insulation vibration isolator combines the characteristics of the traditional negative poisson ratio honeycomb, the traditional hexagonal coplanar structure energy absorption performance, the periodic structure blocking mechanism, the phonon crystal local resonance, the impedance mismatch and the waveform conversion mechanism, the corrugated structure is added, the different-surface rigidity of the added corrugated structure can be effectively reduced, the three-way corrugated honeycomb sound insulation vibration isolator can respectively absorb part of vibration energy in three directions, vibration isolation in a low-frequency range in three directions can be realized, the vibration isolation performance of the device is effectively improved, when vibration energy is transmitted through the device, the structure is vertically deformed, part of energy is converted into internal strain energy, the elastic wave can generate the impedance mismatch through the corrugated structure, waveform conversion can also be carried out, and the elastic wave is converted into longitudinal wave which is not easy to propagate, so that the energy absorption effect is further enhanced.
2. Compared with the traditional honeycomb structure, the corrugated honeycomb structure has better tensile-compression restorability and energy absorption characteristics, particularly ensures the initial rigidity of the vibration isolator and the lateral stability in the deformation process in the vertical direction, ensures that the structure has better high static rigidity, has strong restorability, can provide repeatability protection for vibration, and has better durability than the traditional honeycomb.
3. Through the hole on the honeycomb structure, increase the chance that sound wave and material contacted, sound wave can be at hole inside multiple reflection and scattering after getting into the hole to consume the energy of sound wave, reach the purpose of making an uproar falls, thereby improve the effect of sound absorption, realize the low frequency down partial resonance jointly, absorb low frequency band elastic energy wave, produce low frequency wide band gap, keep apart low frequency vibration propagation.
4. The negative poisson ratio structure, the corrugated honeycomb structure and the hole structure are combined, the energy absorption characteristic and the local resonance mechanism are fully combined, the damping effect of the low frequency band is enhanced, and vibration isolation and sound insulation can be realized.
5. The design method of the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention can customize vibration isolators with different natural frequencies according to different equipment and different vibration frequencies, and realizes the design of the natural frequencies by adjusting the corrugated period, the corrugated amplitude, the structural wall thickness, the side length of the negative poisson ratio structure, the integral length, the integral width and the integral height, thereby realizing the vibration isolation performance index. Compared with the traditional negative poisson ratio structure and the traditional hexagonal honeycomb, the invention has the advantages of designable natural frequency, wider application range, realization of low-frequency vibration isolation, realization of sound insulation and contribution to engineering application in the field of ships.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to better understand the three-way corrugated honeycomb sound insulation vibration isolator and the design method thereof provided by the embodiment of the invention, firstly, the application background is introduced, along with the rapid development of the ship technology, the requirements on ship vibration and noise control are increasingly strict, the vibration isolation and sound insulation design method for the ship power system mainly adopts the vibration isolation technology, and the traditional hexagonal honeycomb structure and the traditional negative poisson ratio structure are adopted at present, and the electronic cabinet is arranged on the ground base through 4 vibration isolators, so that the vibration and noise of the ship cabinet can be reduced to a certain extent.
However, in practical application, the traditional negative poisson ratio and the traditional hexagonal honeycomb vibration isolation structure can only realize coplanar vibration isolation, and the different-surface direction has no vibration isolation effect, so that the traditional hexagonal honeycomb structure and the traditional negative poisson ratio structure have hardly met the higher and higher vibration isolation and sound insulation performance indexes of ships.
Aiming at the problems and findings, the embodiment of the invention provides the three-way corrugated honeycomb sound insulation vibration isolator and the design method thereof, which can effectively reduce the different-surface rigidity, so that the three-way corrugated honeycomb sound insulation vibration isolator can not only respectively absorb part of vibration energy in three directions, but also realize vibration isolation in a low-frequency range in three directions, and effectively improve the vibration isolation performance.
The three-way corrugated honeycomb sound insulation vibration isolator and the design method thereof according to the present invention are described below with reference to fig. 1-6.
Referring to fig. 1 and 2, a three-dimensional corrugated honeycomb sound insulation vibration isolator comprises a plurality of negative poisson ratio cells 10, wherein the plurality of negative poisson ratio cells 10 are periodically arranged in the transverse direction and the longitudinal direction in the same plane to form a three-dimensional honeycomb structure, and the cell walls of the negative poisson ratio cells 10 are in a periodic corrugated structure in the vertical direction perpendicular to the plane.
The vibration isolator provided by the embodiment of the invention combines the characteristics of the traditional negative poisson ratio honeycomb, the traditional coplanar structure energy absorption performance, the periodic structure blocking mechanism, the phonon crystal local resonance, the impedance mismatch and the waveform conversion mechanism, and the corrugated structure is added, so that the different-surface rigidity can be effectively reduced, the vibration isolator can respectively absorb part of vibration energy in three directions, can realize vibration isolation in a low-frequency range in three directions, effectively improves the vibration isolation performance of the device, and when the vibration energy is transmitted through the device, the structure is vertically deformed, part of the energy is converted into internal strain energy, the impedance mismatch can be generated by the elastic wave through the corrugated structure, waveform conversion can also be carried out, and the internal strain energy is converted into longitudinal wave which is not easy to propagate, thereby further enhancing the energy absorption effect.
In addition, the corrugated honeycomb structure exhibits more excellent tensile and compressive recoverability and energy absorption characteristics than conventional honeycomb structures, particularly ensures the initial stiffness of the vibration isolator and lateral stability during deformation in the vertical direction, so that the structure has better high static stiffness, strong recoverability, and can provide repeatability protection for vibration and better durability than the conventional honeycomb structure.
In one embodiment of the present invention, the corrugated structure is a sinusoidal corrugated structure.
In one embodiment of the present invention, referring to fig. 3, the cell walls of the negative poisson's ratio cell 10 include a pair of transverse cell walls 11 extending in the transverse direction and arranged alternately in the longitudinal direction and a pair of longitudinal cell walls 12 extending in the longitudinal direction and arranged alternately in the transverse direction, and the transverse cell walls 11 and the longitudinal cell walls 12 are sequentially connected such that the negative poisson's ratio cell 10 is in a closed structure, and the longitudinal cell walls 12 are bent toward the inner side of the negative poisson's ratio cell 10. The honeycomb structure formed by a plurality of cells 10 with negative poisson's ratio is provided with the negative poisson's ratio effect in a two-dimensional space formed by the transverse direction and the longitudinal direction, so that vibration energy in the transverse direction and the longitudinal direction is effectively absorbed.
In one embodiment of the present invention, the longitudinal walls 12 of the negative poisson ratio cell 10 include a pair of inclined plates 120, wherein one ends of the pair of inclined plates 120 facing away from each other are respectively connected to the pair of transverse walls 11, and the corresponding ends are inclined and connected toward the inner side of the negative poisson ratio cell 10, so that the longitudinal walls 12 of the negative poisson ratio cell 10 are in a V shape, and the negative poisson ratio cell 10 as a whole is in a hexagonal structure.
In some alternative embodiments, the specific materials and the forming manner of the negative poisson's ratio cell 10 may be flexibly designed according to actual requirements.
In one embodiment of the present invention, a pair of inclined plates 120 constituting the longitudinal cell wall 12 are integrally formed.
In one embodiment of the present invention, the longitudinal cell walls 12 of the plurality of negative poisson's ratio cells 10 arranged in the longitudinal direction are formed in correspondence and integrally so that the honeycomb structure assumes a folded line shape in the longitudinal direction.
In one embodiment of the invention, the honeycomb structure formed by the plurality of negative poisson's ratio cells 10 is integrally formed.
The adoption of the integrated forming mode is beneficial to ensuring the structural integrity and the material consistency of the honeycomb structure, eliminating the connection points among different parts and reducing the transmission path of vibration energy.
In some alternative embodiments, the negative poisson's ratio cell 10 may be made of a rubber material or an aluminum alloy material.
In particular, due to the high damping characteristics of the rubber material, it has a good energy dissipation capacity, so that a good vibration isolation effect can be achieved, however, at a specific size and supporting strength, the weight of the rubber material is heavy, which may increase the pressure under the electronic cabinet, while the aluminum alloy sheet has a relatively light weight. Thus, in this embodiment, the negative poisson's ratio cell 10 is made of an aluminum alloy material.
In one embodiment of the present invention, the honeycomb structure formed by the plurality of cells 10 with negative poisson's ratio is formed integrally by using an aluminum alloy material and using a 3D printing technique.
In one embodiment of the invention, referring to fig. 4, holes 13 are provided in the walls of the negative poisson's ratio cell 10. The surface area of the material can be increased through the holes 13, so that the opportunity of contact between sound waves and the material is increased, the sound waves can be reflected and scattered for multiple times in the holes 13 after entering the holes 13, so that the energy of the sound waves is consumed, the purpose of noise reduction is achieved, the sound absorption effect is improved, in addition, the rigidity of the vibration isolator can be obviously reduced due to the influence of the holes 13, the vibration isolation of lower frequency of the vibration isolator is realized, the vibration isolation effect is improved, and meanwhile, the vibration isolator can absorb low-frequency sound waves more effectively.
In some alternative embodiments, the holes 13 may be disposed on the transverse cell wall 11, the longitudinal cell wall 12, and both the transverse cell wall 11 and the longitudinal cell wall 12 of the cell 10 with negative poisson ratio, and the holes 13 may be designed as conventional round holes, or may be holes with other shapes, or may be uniformly or unevenly distributed, and the size, shape, depth, and distribution of the hole 13 design may affect the sound absorption effect thereof.
In one embodiment of the present invention, holes 13 are provided in both the transverse cell wall 11 and the longitudinal cell wall 12 of the negative poisson's ratio cell 10 to enhance the sound absorption effect. The holes 13 are uniformly distributed by adopting traditional round holes, so that local too-dense or too-sparse is avoided, sound waves with different frequencies can be absorbed more uniformly, and the processing and the manufacturing are convenient. In addition, the rigidity of the vibration isolator in the transverse direction, the longitudinal direction and the vertical direction can be obviously reduced due to the influence of the holes 13, the natural frequency of the vibration isolator is further reduced, the vibration isolation of lower frequency of the vibration isolator is realized, the vibration isolation effect is improved, and meanwhile, the vibration isolator can absorb low-frequency sound waves more effectively.
It will be appreciated that the parameters of the ripple period, ripple amplitude, cell wall thickness, cell wall length, and overall length, overall width, overall height, etc. of the honeycomb structure in the negative poisson ratio cell 10 may be flexibly designed according to practical requirements, such as the target frequency, weight, etc. of the required vibration isolation object, and the embodiments of the present invention are not limited in particular.
It is to be understood that negative poisson's ratio cells 10 include, but are not limited to, the structures, materials and shapes listed above, and that other structures or forms of negative poisson's ratio cells 10 are capable of forming a honeycomb structure having a negative poisson's ratio effect in planes of transverse and longitudinal formation.
It is to be understood that the various embodiments or examples described in this specification and the features of the various embodiments or examples may be combined and combined by persons skilled in the art without contradiction.
The design method of the three-way corrugated honeycomb sound insulation vibration isolator provided by the invention is described below, and the design method of the three-way corrugated honeycomb sound insulation vibration isolator and the three-way corrugated honeycomb sound insulation vibration isolator described above can be correspondingly referred to each other.
Referring to fig. 5 and 6, a design method of a three-way corrugated honeycomb sound insulation vibration isolator comprises the following steps:
And 10, constructing a natural frequency prediction model of the vibration isolator.
And 11, obtaining predicted structural parameters of the vibration isolator based on the natural frequency prediction model of the vibration isolator and the weight and the target frequency of the object to be vibration isolated.
And 12, carrying out simulation check based on the predicted structural parameters, and obtaining the final structural parameters of the vibration isolator when the simulation result meets the requirements.
In one embodiment of the invention, the vibration isolator natural frequency prediction model is constructed by:
Step 100, determining a plurality of influencing factors influencing the natural frequency of the vibration isolator.
Step 101, systematically evaluating the influence of different level combinations of a plurality of influence factors on the natural frequency of the vibration isolator through orthogonal experiments.
And 102, determining an optimal horizontal combination scheme based on an orthogonal experiment result, and constructing a natural frequency prediction model of the vibration isolator according to the optimal horizontal combination scheme.
Specifically, several of the above-described influencing factors affecting the natural frequency of the vibration isolator include, but are not limited to, the corrugation period, the corrugation amplitude, the structural wall thickness, the negative poisson's ratio structural side length, the overall width, the overall height, and the weight of the weight.
Before a model is built, a plurality of influence factors influencing the natural frequency of the vibration isolator are determined through a large number of experiments, a part of representative factors are selected from the comprehensive experiments through orthogonal experiments to perform experiments, the influence of different horizontal combinations of a plurality of influence factors on the natural frequency of the vibration isolator is systematically evaluated, an optimal horizontal combination scheme is determined according to orthogonal test results, so that a complete vibration isolator natural frequency prediction model is formed, and after the model is built, the weight of an object to be vibration isolated and the target frequency to be vibration isolated are calculatedThe multiple is substituted into the model, so that the predicted structural parameters of the vibration isolator are reversely measured, the predicted structural parameters are drawn according to the predicted structural parameters, simulation software is added to analyze the mode under the ideal condition, and if the simulation result is negative and meets the requirements, the final structural parameters of the vibration isolator are obtained, and a foundation is laid for subsequent manufacturing and experimental verification.
It can be understood that the simulation software may be Wave6, COMSOL Multiphysics, abaqus, etc., and specifically may be selected according to actual requirements, which is not limited in the embodiment of the present invention.
In one embodiment of the invention, the design method of the three-way corrugated honeycomb sound insulation vibration isolator further comprises the following steps:
And 13, manufacturing the vibration isolator based on final structural parameters, wherein the honeycomb structure is made of aluminum alloy materials and integrally formed by using a 3D printing technology, and holes are drilled on cell walls of the honeycomb structure after the honeycomb structure is formed, so that the vibration isolator is finally formed.
Specifically, the honeycomb structure is made of aluminum alloy materials and is formed by using a 3D printing technology, and the traditional rubber materials are abandoned, so that the rubber materials are good in vibration isolation effect, but heavy in weight under the same supporting strength, the pressure below the electronic cabinet can be possibly increased for a specific size, and the aluminum alloy materials can enable the vibration isolator to have lighter weight, higher energy absorption efficiency and better frequency response characteristic.
After the honeycomb structure is formed, holes are drilled on the transverse cell walls 11 and the longitudinal cell walls 12 of the honeycomb structure, and finally the three-way corrugated honeycomb sound insulation vibration isolator is formed.
According to the three-way corrugated honeycomb sound insulation vibration isolator and the design method thereof provided by the embodiment of the invention, the vibration isolator combines the characteristics of the energy absorption performance of a traditional negative poisson ratio honeycomb structure, the energy absorption performance of a traditional hexagonal coplanar structure, the blocking mechanism of a periodic structure, the local resonance of a phonon crystal, the impedance mismatch and the waveform conversion mechanism, the corrugated structure is added, the different-surface rigidity of the added corrugated structure can be effectively reduced, the added corrugated structure can not only respectively absorb part of vibration energy in three directions, but also can realize vibration isolation in a low-frequency range in three directions, the vibration isolation performance of the device is effectively improved, when vibration energy is transmitted through the device, the structure is vertically deformed, part of energy is converted into internal strain energy, the impedance mismatch is generated by the elastic wave through the corrugated structure, the waveform conversion is also generated, the elastic wave is converted into longitudinal wave which is not easy to propagate, and the energy absorption effect is further enhanced.
In addition, the corrugated honeycomb structure exhibits superior tensile-compression restorability and energy absorption characteristics compared with the conventional honeycomb structure, particularly ensures the initial rigidity of the vibration isolator and lateral stability in the deformation process in the vertical direction, ensures that the structure has better high static rigidity, has strong restorability, can provide repeatability protection for vibration, and provides better durability than the conventional honeycomb.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiments of the present invention.