Phononic crystal periodic structure design method for barrier vibration isolation

Abstract

The invention discloses a design method of a phononic crystal periodic structure for barrier vibration isolation, which comprises the following steps of: 1, designing phononic crystal unit cell element structure characteristics aiming at target vibration source frequency domain characteristics; 2, calculating and analyzing cut-off frequency band characteristics of the phononic crystal cell elements according to the designed phononic crystal cell elements; 3, according to the designed phononic crystal cell elements, a certain structure is formed through three-dimensional stacking and combination of unit cell structures, and after steel pipe piles are installed, steel pipe-phononic crystal single piles are built in a combined mode; 4, designing a periodic structure based on the steel pipe-photonic crystal single pile by considering a pile group design theory according to the combined steel pipe-photonic crystal single pile; 5, according to the designed periodic structure, the number of rows, the number of columns and the arrangement scheme are continuously adjusted, finite element numerical calculation is carried out, the vibration isolation efficiency is calculated, and a reasonable scheme is determined.

Description

Technical Field

[0001] The present invention relates to the field of rotation control technology, and more specifically to a method for designing a phononic crystal periodic structure for barrier vibration isolation, which can be applied, for example, to the control of vibration propagation paths of strong vibration sources in the fields of rail transit, construction tamping, explosion testing, etc. Background Art

[0002] In recent years, with the rapid development of urban rail transit, the vibration and noise impact of subways, light rails, and urban high-speed railways on the surrounding environment has become increasingly serious, leading to problems with the comfort of personnel in building structures, the inability of instruments and equipment to be used normally, and even causing social stability problems; in addition, strong vibrations such as construction tamping and explosion tests will also cause disturbances to the surrounding environment, and vibration control measures must be taken. Vibration propagation path control is a key technology in the key link of vibration control, which can effectively cut off and attenuate the propagation of vibration to a distant or target location. Barrier vibration isolation is an important means and method of vibration propagation path control, which has been widely used in actual projects. The main implementation methods include pile rows, vibration isolation trenches, and wave damping plates, but the effect still has some shortcomings. The vibration isolation effect of multi-band stop band effect is better. How to achieve a good vibration isolation effect of multi-band stop band effect is of great practical value for actual projects, but research in this area is still in its initial stage. Summary of the invention

[0003] In view of the above problems, the present invention proposes a method for designing a phononic crystal periodic structure for barrier vibration isolation. Based on the design of the phononic crystal cell, the technology obtains the target vibration isolation performance (band cutoff characteristics), and then carries out the cell combination design. After reaching a certain width and a certain height of the combined cell structure, a steel pipe is installed to form a steel pipe-cell combined phononic crystal single pile. After the single pile design is completed, the periodic structure design of the combination from the single pile to the row of piles is carried out. The design of the periodic structure takes into account the pile foundation design concepts such as the distance-to-diameter ratio, and performs multiple scheme optimization and comparison. After the optimal periodic structure layout scheme is formed, finite element calculation is carried out to evaluate the barrier vibration isolation effect.

[0004] More specifically, according to one aspect of the present invention, there is provided a method for designing a phononic crystal periodic structure for barrier vibration isolation, comprising:

[0005] Step 1: Design the structural characteristics of the phononic crystal unit cell based on the frequency domain characteristics of the target vibration source;

[0006] Step 2: According to the designed phononic crystal cell, calculate and analyze the cutoff frequency band characteristics of the phononic crystal cell. The stop band bandwidth should be able to cover the excellent frequency range of the vibration source. If the vibration source has multiple excellent frequency bands, the stop band characteristics of the phononic crystal should be consistent with them.

[0007] Step 3: According to the designed phononic crystal unit cell, a certain structure is formed by three-dimensional stacking of the unit cell structure, and after being loaded into a steel pipe pile, a steel pipe-phononic crystal single pile is assembled;

[0008] Step 4: Based on the combined steel tube-phononic crystal single pile, considering the pile group design theory, a periodic structure based on the steel tube-phononic crystal single pile is designed;

[0009] Step 5: According to the designed periodic structure, continuously adjust the number of rows, columns and layout, carry out finite element numerical calculations, calculate the vibration isolation efficiency, and determine a reasonable solution.

[0010] According to an embodiment of the present invention, step two also includes: optimizing and designing the phononic crystal unit cell structure based on the frequency cutoff characteristics of the phononic crystal and according to the frequency band characteristics of the vibration source.

[0011] According to an embodiment of the present invention, the step one includes: geometric design of the phononic crystal unit cell structure, analysis and optimization of stop band characteristics, and topology optimization.

[0012] According to an embodiment of the present invention, the step 2 further includes: utilizing experimental design and additive manufacturing technology to further analyze the unit cell structure characteristics based on numerical analysis.

[0013] According to an embodiment of the present invention, step three also includes: an optimization process of stacking from a phononic crystal unit cell structure to a three-dimensional structure.

[0014] According to an embodiment of the present invention, step four also includes: vibration control performance analysis of the steel tube-phononic crystal single pile combination structure and distance-to-diameter ratio optimization design considering pile group effect.

[0015] According to another aspect of the present invention, there is provided a device for designing a phononic crystal periodic structure for barrier vibration isolation, characterized in that it comprises:

[0016] The phononic crystal unit cell design module is used to design the structural characteristics of the phononic crystal unit cell based on the frequency domain characteristics of the target vibration source;

[0017] The cut-off frequency band characteristic analysis module of the phononic crystal cell is used to calculate and analyze the cut-off frequency band characteristics of the phononic crystal cell according to the designed phononic crystal cell. The stop-band bandwidth should be able to cover the excellent frequency range of the vibration source. If the vibration source has multiple excellent frequency bands, the stop-band characteristics of the phononic crystal should be consistent with them.

[0018] The steel pipe-phononic crystal monopile building module is used to build a steel pipe-phononic crystal monopile by stacking the designed phononic crystal cells into a certain structure through three-dimensional stacking of the unit cell structure, and then putting them into the steel pipe piles;

[0019] A phononic crystal periodic structure design module is used to design a periodic structure based on a steel tube-phononic crystal single pile by considering the pile group design theory according to the combined steel tube-phononic crystal single pile; and

[0020] The phononic crystal periodic structure optimization module is used to continuously adjust the number of rows, columns and layout schemes according to the designed periodic structure, carry out finite element numerical calculations, calculate the vibration isolation efficiency and determine a reasonable scheme.

[0021] According to another aspect of the present invention, there is also provided an electronic device, comprising: a memory and one or more processors;

[0022] The memory is used to store one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method described in the present invention.

[0023] The method for designing a phononic crystal periodic structure for barrier vibration isolation of the present invention is ingenious in design and has significant key points. It can start from the cutoff frequency band characteristics of the phononic crystal and design a phononic crystal unit cell structure that meets the cutoff frequency band characteristics according to the frequency domain characteristics of the target vibration source, and then stack the unit cell structure in three directions and load it into a steel pipe pile to form a steel pipe-phononic crystal single pile. Then, based on the pile group design theory, a periodic structure barrier is designed and formed, and key factors such as the distance-to-diameter ratio are continuously optimized to adjust the design of the periodic barrier, and finally a phononic crystal periodic structure barrier design scheme that can achieve the target vibration isolation efficiency is formed. The present invention closely combines phononic crystals and periodic structures and introduces them into barrier vibration isolation, which has important guiding significance for propagation path control.

[0024] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic flow chart of a method for designing a phononic crystal periodic structure for barrier vibration isolation according to an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a phononic crystal unit cell structure and stop band characteristics for barrier vibration isolation according to an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a steel pipe-phononic crystal monopile structure in a method for designing a phononic meso-crystal periodic structure for barrier vibration isolation according to an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of a phononic crystal periodic structure barrier vibration isolation for barrier vibration isolation according to an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of a device for designing a periodic structure of a phonon crystal for barrier vibration isolation according to an embodiment of the present invention; and

[0030] Figure 6 Schematic diagram of the structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. The shown contents are used to fully illustrate the contents of the present invention, but are not used to limit the present invention.

[0032] It should be understood that the phononic crystals, pile group design theory, finite element analysis, etc. involved in the present invention are known in themselves, so the present invention focuses on how to combine and apply the above-mentioned various tools or theories to design the phononic crystal periodic structure of the present invention.

[0033] Figure 1 Schematic diagram of a process for designing a phononic crystal periodic structure for barrier vibration isolation according to an embodiment of the present invention. Figure 1 , a method for designing a phononic crystal periodic structure for barrier vibration isolation according to an embodiment of the present invention may include:

[0034] Design of phononic crystal unit cell: The unit cell design of phononic crystal should be carried out according to the target vibration source characteristics, which can include the geometric design of the phononic crystal unit cell structure, analysis and optimization of stop band characteristics, and topology optimization, etc. For example, the design can be carried out based on commercial software such as nTop, and its stop band characteristics can be continuously optimized and analyzed until the target frequency domain requirements are met.

[0035] More specifically, the cutoff frequency band characteristics of the phononic crystal cell can be calculated and analyzed based on the designed phononic crystal cell. The stop band width should be able to cover the excellent frequency range of the vibration source. If the vibration source has multiple excellent frequency bands, the stop band characteristics of the phononic crystal should be consistent with it. Based on the frequency cutoff characteristics of the phononic crystal, the phononic crystal unit cell structure is optimized and designed according to the frequency band characteristics of the vibration source. Experimental design and additive manufacturing technology can be used to further analyze the unit cell structure characteristics on the basis of numerical analysis. Figure 2 Schematic diagram of the phononic crystal unit cell structure and stop band characteristics for barrier vibration isolation according to an embodiment of the present invention.

[0036] Afterwards, the three-way stacking structure of the phononic crystal is designed: the purpose of the three-way stacking of the phononic crystal is to form a three-dimensional combined structure to be placed in the steel pipe pile. The three-way stacking design should comprehensively consider the three-way propagation characteristics of the wave and the natural frequency characteristics after combination to carry out optimal design.

[0037] Then the steel tube-phononic crystal pile is designed: the design should take into account the requirements of the pile design, including bearing capacity, etc., as well as the vibration control performance of the steel tube-phononic crystal pile. It is necessary to first perform numerical calculations and analysis on the pile to ensure that the vibration isolation and other requirements are met before designing the periodic structure. In addition, the optimization process of stacking from the phononic crystal unit cell structure to the three-dimensional structure should also be considered. See the schematic diagram of the steel tube-phononic crystal pile structure for details. Figure 3 .

[0038] After designing the steel tube-phononic crystal single pile, the phononic crystal periodic structure barrier is designed: this design includes the vibration control performance analysis of the steel tube-phononic crystal single pile combination structure, and should also comprehensively consider the pile group effect, optimize the design distance-to-diameter ratio and other factors, and continuously adjust the number of rows and columns of the periodic structure until the overall vibration isolation requirements are met. Figure 4 Schematic diagram of barrier vibration isolation using a phononic crystal periodic structure for barrier vibration isolation according to an embodiment of the present invention.

[0039] Figure 5 Schematic diagram of a phononic crystal periodic structure design device for barrier vibration isolation according to an embodiment of the present invention. Figure 5 As shown, the device includes: a phononic crystal unit cell design module 210, which is used to design the structural characteristics of the phononic crystal unit cell based on the frequency domain characteristics of the target vibration source; a phononic crystal unit cell cutoff band characteristic analysis module 220, which is used to calculate and analyze the cutoff band characteristics of the phononic crystal unit cell according to the designed phononic crystal unit cell, and the stop band bandwidth should be able to cover the excellent frequency range of the vibration source. If the vibration source has multiple excellent frequency bands, the stop band characteristics of the phononic crystal should be consistent with them; a steel pipe-phononic crystal single pile construction module 230, which is used to The phononic crystal cells are combined into a certain structure through three-dimensional stacking of the unit cell structure, and after being loaded into the steel pipe pile, a steel pipe-phononic crystal pile is assembled; the phononic crystal periodic structure design module 240: is used to design a periodic structure based on the steel pipe-phononic crystal pile according to the combined steel pipe-phononic crystal pile and considering the pile group design theory; the phononic crystal periodic structure optimization module 250 is used to continuously adjust the number of rows, columns and layout schemes according to the designed periodic structure, carry out finite element numerical calculations, calculate the vibration isolation efficiency, and determine a reasonable scheme.

[0040] Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the electronic device includes a processor 310, a memory 320, an input device 330 and an output device 340; the number of the processor 310 in the electronic device can be one or more. Figure 3 A processor 310 is taken as an example; the processor 310, the memory 320, the input device 330 and the output device 340 in the electronic device can be connected via a bus or other means. Figure 3 The example of connecting through bus is taken in the following.

[0041] The memory 320, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the phononic crystal periodic structure design method for barrier vibration isolation in the embodiment of the present invention (for example, the phononic crystal unit cell design module 210; the cutoff frequency band characteristic analysis module 220 of the phononic crystal unit cell; the steel pipe-phononic crystal single pile construction module 230; the phononic crystal periodic structure design module 240; the phononic crystal periodic structure optimization module 250). The processor 310 executes various functional applications and data processing of the electronic device by running the software programs, instructions and modules stored in the memory 320, that is, realizes the above-mentioned phononic crystal periodic structure design method for barrier vibration isolation.

[0042] The present invention can achieve beneficial technical effects:

[0043] (1) The phononic crystals are applied to the barrier vibration isolation in an efficient and accurate manner. The frequency cutoff characteristics of the phononic crystals are an important basis for the effective application of the present invention.

[0044] (2) The vibration isolation performance of the periodic structure is an important carrier for the application of phononic crystals. It can achieve the vibration isolation effect of pile rows through periodic adjustment and can effectively control the propagation path of vibration. It will be widely used in many fields such as rail transportation.

[0045] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A method for designing a periodic structure of a phononic crystal for barrier vibration isolation, characterized in that: include: Step 1: Design the structural characteristics of the phononic crystal unit cell based on the frequency domain characteristics of the target vibration source; Step 2: According to the designed phononic crystal cell, calculate and analyze the cutoff frequency band characteristics of the phononic crystal cell. The stop band bandwidth should be able to cover the excellent frequency range of the vibration source. If the vibration source has multiple excellent frequency bands, the stop band characteristics of the phononic crystal should be consistent with them. Step 3: According to the designed phononic crystal unit cell, a certain structure is formed by three-dimensional stacking of the unit cell structure, and after being loaded into a steel pipe pile, a steel pipe-phononic crystal single pile is assembled; Step 4: Based on the combined steel tube-phononic crystal single pile, considering the pile group design theory, a periodic structure based on the steel tube-phononic crystal single pile is designed; Step 5: According to the designed periodic structure, continuously adjust the number of rows, columns and layout, carry out finite element numerical calculations, calculate the vibration isolation efficiency, and determine a reasonable solution.

2. The method for designing a phononic crystal periodic structure for barrier vibration isolation according to claim 1, characterized in that: Step 2 also includes: optimizing and designing the phononic crystal unit cell structure based on the frequency cutoff characteristics of the phononic crystal and the frequency band characteristics of the vibration source.

3. The method for designing a phononic crystal periodic structure for barrier vibration isolation according to claim 1, characterized in that: The step one includes: geometric design of the phononic crystal unit cell structure, analysis and optimization of stop band characteristics, and topology optimization.

4. The method for designing a phononic crystal periodic structure for barrier vibration isolation according to claim 1, characterized in that: The step 2 also includes: using experimental design and additive manufacturing technology to further analyze the unit cell structure characteristics based on numerical analysis.

5. The method for designing a phononic crystal periodic structure for barrier vibration isolation according to claim 1, characterized in that: The step three also includes: an optimization process of stacking from a phononic crystal unit cell structure to a three-dimensional structure.

6. The method for designing a phononic crystal periodic structure for barrier vibration isolation according to claim 1, characterized in that: The step four also includes: vibration control performance analysis of the steel tube-phononic crystal single pile combination structure and pitch-to-diameter ratio optimization design considering the pile group effect.

7. A phononic crystal periodic structure design device for barrier vibration isolation, characterized in that: include: The phononic crystal unit cell design module is used to design the structural characteristics of the phononic crystal unit cell based on the frequency domain characteristics of the target vibration source; The cut-off frequency band characteristic analysis module of the phononic crystal cell is used to calculate and analyze the cut-off frequency band characteristics of the phononic crystal cell according to the designed phononic crystal cell. The stop-band bandwidth should be able to cover the excellent frequency range of the vibration source. If the vibration source has multiple excellent frequency bands, the stop-band characteristics of the phononic crystal should be consistent with them. The steel pipe-phononic crystal monopile building module is used to build a steel pipe-phononic crystal monopile by stacking the designed phononic crystal cells into a certain structure through three-dimensional stacking of the unit cell structure, and then putting them into the steel pipe piles; The phononic crystal periodic structure design module is used to design a periodic structure based on a steel tube-phononic crystal single pile according to the combined steel tube-phononic crystal single pile and considering the pile group design theory; as well as The phononic crystal periodic structure optimization module is used to continuously adjust the number of rows, columns and layout schemes according to the designed periodic structure, carry out finite element numerical calculations, calculate the vibration isolation efficiency and determine a reasonable scheme.

8. An electronic device, characterized in that: include: memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 6.

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