Laminated composite vibration damping method and system based on surface wave and molecular spring vibration damping

Abstract

The present invention discloses a laminated composite vibration reduction method and system based on surface wave and molecular spring vibration reduction, belonging to the technical field of ship vibration reduction and noise reduction. Among them, the method includes: obtaining the equipment vibration reduction requirements according to the information of the equipment to be vibration-reduced; establishing a finite element calculation model of the equipment-base-hull structure, then determining the design requirements of the vibration reduction device according to the equipment vibration reduction requirements, and then determining the parameters of the vibration reduction device; establishing a finite element vibration isolation and reduction evaluation model of the equipment-device-base-hull structure according to the finite element calculation model of the equipment-base-hull structure and the parameters of the vibration reduction device, using the acceleration vibration level drop as the evaluation index, judging whether the acceleration vibration level drop meets the design requirements of the vibration reduction device. If it meets, the final form of the vibration reduction device is determined. Otherwise, the vibration reduction device is redesigned until the design requirements are met. This method can perform quantitative calculations and effectively evaluate the vibration isolation and reduction effect, has a simple process and high versatility, and can improve the design efficiency of the vibration reduction device.

Description

Technical Field

[0001] The invention relates to the technical field of ship vibration reduction and noise reduction, and in particular to a laminated composite vibration reduction method and system based on surface wave and molecular spring vibration reduction. Background Art

[0002] The vibration generated by the operation of marine equipment such as main engines and generators is the main source of ship mechanical noise. The excitation of marine equipment is generally transmitted to the hull structure through structures such as the base. Vibration reduction and isolation components are an important barrier to ship vibration noise control, and their vibration reduction performance directly determines the level of ship radiated noise. In recent years, my country has gradually improved the vibration reduction and isolation system of ship mechanical equipment, and achieved a steady improvement in the level of ship radiated noise control, but the low-frequency vibration reduction effect still does not meet the concealment requirements of the new anti-submarine detection system. The main reason is that the existing vibration reduction and isolation components are designed based on the classical vibration isolation theory, relying on the point-to-point transmission of the excitation force by the vibration isolator, requiring the ratio of the excitation force frequency to the natural frequency of the vibration reduction component to be no less than 2. To further improve the vibration reduction and isolation effect, active control or reducing the natural frequency of the vibration reduction component as much as possible is required, which brings severe challenges to the design of ship vibration reduction components and resource consumption. In the design process of traditional vibration isolation components, the vibration isolation components are usually designed and improved according to the control frequency band of each physical parameter of the equipment to enable the system to obtain a better vibration isolation effect. However, when the excitation frequency is too low, low-frequency vibration isolation can only be achieved by reducing the stiffness of the system or increasing the mass of the vibration isolation body, which is not conducive to the stability of the vibration isolation system and the lightweight of the ship. Therefore, new solutions need to be sought for low-frequency or lower-frequency vibration isolation.

[0003] There are mainly two solutions to the above problems: one is a double-layer vibration damping device for a fully rotating rudder propeller and its design method, and a vibration damping device for a ship engine. Among them, a double-layer vibration damping device for a fully rotating rudder propeller includes a mounting frame for the fully rotating rudder propeller device, a plurality of vibration damping blocks with three-way stiffness evenly arranged around the upper and lower panels of the mounting frame, a vibration damping block housing for fixing the vibration damping blocks and limiting the fully rotating rudder propeller device, and a base structure for mounting the vibration damping block housing, etc. This vibration damping device can effectively reduce the vertical, lateral, longitudinal, torsional directions and their coupled vibrations of the fully rotating rudder propeller device. Since a plurality of vibration damping blocks are evenly arranged around the mounting frame and are divided into upper and lower layers, it can effectively control the deformation of the vibration damping blocks caused by the input shaft torque and the propeller thrust at the same time, not only reducing the dynamic deformation problem of the input shaft of the rudder propeller device, but also reducing the vibration transmitted from the rudder propeller device to the ship's rudder structure, thereby improving the operation stability. However, the vibration isolation form of this solution is single and the light weight is insufficient; the vibration damping device for a ship engine includes an upper support member and a lower support member. There are two rows of multi-row intermediate vibration damping members symmetrically arranged left and right between the upper support member and the lower support member and fixedly connected to the upper support member and the lower support member respectively. The intermediate vibration damping member includes a support base for connecting to the lower support member. A hemispherical cavity vibration damping cover with an open top is connected to the upper plane of the support base. The open top is connected with a flange, and a limiting rod with one end extending into the cavity of the hemispherical cavity vibration damping cover is installed in the central hole provided in the flange. The other end of the limiting rod is connected to the upper support member. A number of vibration damping metal particles are also filled in the cavity of the hemispherical cavity vibration damping cover. Although this solution has a good vibration damping effect, the manufacturing process is relatively complex and the application range is limited.

[0004] Therefore, there is an urgent need for a vibration damping device with high efficiency in vibration damping, especially low-frequency vibration damping, and with a simple structure and light weight, as well as its design method. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0006] For this reason, an object of the present invention is to propose a laminated composite vibration damping method based on surface waves and molecular springs for vibration damping. The method has a simple process flow, high versatility, and can improve the design efficiency of vibration damping devices.

[0007] For this reason, another object of the present invention is to propose a laminated composite vibration damping system based on surface waves and molecular springs for vibration damping.

[0008] Another object of the present invention is to propose a computer device.

[0009] Still another object of the present invention is to propose a non-temporary computer-readable storage medium.

[0010] To achieve the above object, an embodiment of the first aspect of the present invention provides a laminated composite vibration damping method based on surface waves and molecular springs, which includes the following steps: Step S1, obtaining the equipment vibration damping requirements according to the information of the equipment to be vibration-damped, where the equipment vibration damping requirements include the vibration requirements of the equipment operating environment and the vibration damping level requirements that the equipment vibration damping device needs to achieve; Step S2, establishing a finite element calculation model of the equipment-base-hull structure, and determining the design requirements of the vibration damping device according to the vibration characteristics of the equipment to be detected and the equipment vibration damping requirements; Step S3, determining the parameters of the vibration damping device according to the information of the equipment to be vibration-damped and the design requirements of the vibration damping device; Step S4, inputting the parameters of the vibration damping device into the finite element calculation model of the equipment-base-hull structure, and using the acceleration vibration level drop as an evaluation index to determine whether the acceleration vibration level drop meets the design requirements of the vibration damping device. If it meets, the final form of the vibration damping device is determined. If it does not meet, return to Step S3 to redesign the parameters of the vibration damping device until the design is satisfied.

[0011] The laminated composite vibration damping method based on surface waves and molecular springs in the embodiment of the present invention can perform quantitative calculations and effectively evaluate the vibration isolation and damping effects. The process is simple, has high versatility, can improve the design efficiency of the vibration damping device, has good practicability and a wide range of application fields, and is convenient for technology promotion.

[0012] In addition, the laminated composite vibration damping method based on surface waves and molecular springs according to the above embodiment of the present invention may further have the following additional technical features:

[0013] Further, in an embodiment of the present invention, Step S2 specifically includes: Step S201, establishing the finite element calculation model of the equipment-base-hull structure according to the information of the equipment to be vibration-damped, the preset base, and the preset hull structure; Step S202, using the finite element calculation model of the equipment-base-hull structure to determine whether the equipment operation meets the vibration requirements of the equipment operating environment in the state without a vibration damping device. If it meets, there is no design requirement for the vibration damping device for the equipment to be vibration-damped. If it does not meet, clarify the design requirements of the vibration damping device.

[0014] Further, in an embodiment of the present invention, step S3 specifically includes: step S301, determining the layout characteristics of the pressure-bearing panel according to the positions of the equipment feet and the requirements for the stiffness and stability of the equipment, wherein the layout characteristics of the pressure-bearing panel include the number, size, arrangement mode, and thickness of the pressure-bearing panel sub-structures; step S302, determining the layout characteristics of the liquid capsule layer according to the layout characteristics of the pressure-bearing panel and the excitation characteristics of the equipment, wherein the layout characteristics of the liquid capsule layer include the coverage range of the liquid capsule layer, the number of liquid capsules, the thickness of the liquid capsule layer, and the liquid contained in the liquid capsules; step S303, determining the size and number of the molecular spring shock absorbers according to the layout characteristics of the liquid capsule layer and the low-frequency vibration reduction requirements of the equipment; step S304, determining the sizes of the liquid capsule partitions and the limit grooves according to the coverage range and thickness of the liquid capsule layer.

[0015] Further, in an embodiment of the present invention, step S4 specifically includes: step S401, establishing an initial vibration isolation and reduction evaluation structural model of the equipment-device-base-hull structure in finite element simulation software according to the vibration reduction device parameters and the actual structural dimensions in the finite element calculation model of the equipment-base-hull structure; step S402, endowing the initial vibration isolation and reduction evaluation structural model of the equipment-device-base-hull structure with material properties and setting boundary adjustments according to the vibration reduction device parameters and the actual material information and actual boundaries in the finite element calculation model of the equipment-base-hull structure to obtain a finite element vibration isolation and reduction evaluation model of the equipment-device-base-hull structure; step S403, dividing the finite element network of the finite element vibration isolation and reduction evaluation model of the equipment-device-base-hull structure according to the calculation requirements, calculating the simulation calculation results, and further solving the acceleration vibration level drop; step S404, taking the acceleration vibration level drop as an evaluation index, determining whether the acceleration vibration level drop meets the design requirements of the vibration reduction device. If it meets, determine the final form of the vibration reduction device; if it does not meet, return to step S3 to reset the vibration reduction device parameters until it is satisfied.

[0016] To achieve the above object, an embodiment of the second aspect of the present invention provides a laminated composite vibration damping system based on surface waves and molecular springs, including: a module for determining the vibration damping requirements of the device, which is used to obtain the vibration damping requirements of the device according to the information of the device to be vibration-damped, where the vibration damping requirements of the device include the vibration requirements of the device operating environment and the vibration damping level requirements that the device vibration damping device needs to achieve; a module for determining the design requirements of the vibration damping device, which is used to establish a finite element calculation model of the device-base-hull structure, and determine the design requirements of the vibration damping device according to the vibration characteristics of the device to be detected and the vibration damping requirements of the device; a module for determining the parameters of the vibration damping device, which is used to determine the parameters of the vibration damping device according to the information of the device to be vibration-damped and the design requirements of the vibration damping device; a module for determining the final form of the vibration damping device, which is used to input the parameters of the vibration damping device into the finite element calculation model of the device-base-hull structure, and use the acceleration vibration level drop as an evaluation index to judge whether the acceleration vibration level drop meets the design requirements of the vibration damping device. If it meets, the final form of the vibration damping device is determined. If it does not meet, the module returns to the module for determining the parameters of the vibration damping device to redesign the parameters of the vibration damping device until the design is satisfied.

[0017] The laminated composite vibration damping system based on surface waves and molecular springs according to the embodiment of the present invention can perform quantitative calculations and effectively evaluate the vibration isolation and damping effects. The process is simple, has high versatility, can improve the design efficiency of the vibration damping device, has good practicability and a wide range of application fields, and is convenient for technology promotion.

[0018] In addition, the laminated composite vibration damping system based on surface waves and molecular springs according to the above embodiment of the present invention may further have the following additional technical features:

[0019] Further, in an embodiment of the present invention, the module for determining the design requirements of the vibration damping device specifically includes: a first model construction unit, which is used to establish the finite element calculation model of the device-base-hull structure according to the information of the device to be vibration-damped, the preset base, and the preset hull structure; a unit for clarifying the design requirements of the vibration damping device, which is used to judge whether the device operation meets the vibration requirements of the device operating environment in the state without the vibration damping device through the finite element calculation model of the device-base-hull structure. If it meets, there is no design requirement for the vibration damping device for the device to be vibration-damped. If it does not meet, the design requirements of the vibration damping device are clarified.

[0020] Further, in an embodiment of the present invention, the module for determining the design requirements of the vibration damping device specifically includes: a first model construction unit, configured to establish a finite element calculation model of the equipment-base-hull structure according to the equipment to be vibration-damped, a preset base, and preset hull structure information; a unit for clarifying the design requirements of the vibration damping device, configured to determine whether the equipment operation meets the vibration requirements of the equipment operation environment in the state without the vibration damping device through the finite element calculation model of the equipment-base-hull structure. If it meets the requirements, there is no design requirement for the vibration damping device for the equipment to be vibration-damped. If it does not meet the requirements, the design requirements of the vibration damping device are clarified.

[0021] Further, in an embodiment of the present invention, the module for determining the parameters of the vibration damping device specifically includes: a first parameter determination unit, configured to determine the layout characteristics of the pressure-bearing panel according to the position of the equipment feet and the requirements for the stiffness and stability of the equipment, where the layout characteristics of the pressure-bearing panel include the number, size, arrangement mode, and thickness of the pressure-bearing panel sub-structures; a second parameter determination unit, configured to determine the layout characteristics of the liquid chamber layer according to the layout characteristics of the pressure-bearing panel and the excitation characteristics of the equipment, where the layout characteristics of the liquid chamber layer include the coverage range of the liquid chamber layer, the number of liquid chambers, the thickness of the liquid chamber layer, and the liquid contained in the liquid chamber; a third parameter determination unit, configured to determine the size and number of the molecular spring shock absorbers according to the layout characteristics of the liquid chamber layer and the low-frequency vibration damping requirements of the equipment; a fourth parameter determination unit, configured to determine the sizes of the liquid chamber partition and the limit groove according to the coverage range and thickness of the liquid chamber layer.

[0022] Further, in an embodiment of the present invention, the unit for clarifying the design requirements of the vibration damping device includes: an initial model construction unit, configured to establish an initial vibration isolation and damping evaluation structure model of the equipment-device-base-hull structure in the finite element simulation software according to the parameters of the vibration damping device and the actual structural dimensions in the finite element calculation model of the equipment-base-hull structure; a second model construction unit, configured to endow the initial vibration isolation and damping evaluation structure model of the equipment-device-base-hull structure with material properties and set boundary adjustments according to the actual material information and actual boundaries in the finite element calculation model of the equipment-base-hull structure to obtain a finite element vibration isolation and damping evaluation model of the equipment-device-base-hull structure; a solving unit, configured to divide the finite element network for the finite element vibration isolation and damping evaluation model of the equipment-device-base-hull structure according to the calculation requirements, calculate the simulation calculation results, and further solve the acceleration vibration level drop; a unit for determining the final form of the vibration damping device, configured to judge whether the acceleration vibration level drop meets the design requirements of the vibration damping device with the acceleration vibration level drop as the evaluation index. If it meets the requirements, the final form of the vibration damping device is determined. If it does not meet the requirements, return to step S3 to reset the parameters of the vibration damping device until it is satisfied.

[0023] In another aspect of the present invention, an embodiment provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method for laminated composite vibration reduction based on surface waves and molecular springs for vibration reduction as described in the above embodiments is implemented.

[0024] In still another aspect of the present invention, an embodiment provides a non - transitory computer - readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method for laminated composite vibration reduction based on surface waves and molecular springs for vibration reduction as described in the above embodiments is implemented.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above - mentioned and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, where:

[0027] Figure 1 is a flowchart of the method for laminated composite vibration reduction based on surface waves and molecular springs for vibration reduction according to an embodiment of the present invention;

[0028] Figure 2 is an overall schematic diagram of the final form of a vibration - reduction device according to an embodiment of the present invention;

[0029] Figure 3 is a structural schematic diagram of the final form of a vibration - reduction device according to an embodiment of the present invention;

[0030] Figure 4 is a comparison diagram of the underwater radiated noise of a ship before and after a laminated composite vibration - reduction device designed according to an embodiment of the present invention;

[0031] Figure 5 is a structural schematic diagram of a laminated composite vibration - reduction system based on surface waves and molecular springs for vibration reduction according to an embodiment of the present invention.

[0032] DESCRIPTION OF THE REFERENCE NUMERALS:

[0033] 1 - pressure - bearing panel sub - structure, 2 - hinge, 3 - liquid - filled bladder layer, 4 - liquid - filled bladder partition, 5 - molecular spring shock absorber, 6 - bottom plate, 7 - limit groove, 100 - laminated composite vibration - reduction system based on surface waves and molecular springs for vibration reduction, 101 - module for determining the vibration - reduction requirements of the device, 102 - module for determining the design requirements of the vibration - reduction device, 103 - module for determining the parameters of the vibration - reduction device, and 104 - module for determining the final form of the vibration - reduction device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] The laminated composite vibration damping method and system based on surface waves and molecular springs for vibration damping according to an embodiment of the present invention will be described below with reference to the accompanying drawings. First, the laminated composite vibration damping method based on surface waves and molecular springs for vibration damping according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0036] Figure 1 is a flowchart of a laminated composite vibration damping method based on surface waves and molecular springs for vibration damping according to an embodiment of the present invention.

[0037] As Figure 1 shown, the laminated composite vibration damping method based on surface waves and molecular springs for vibration damping includes the following steps:

[0038] In step S1, the vibration damping requirements of the equipment are obtained according to the information of the equipment to be vibration-damped, where the vibration damping requirements of the equipment include the vibration requirements of the equipment operating environment and the vibration damping level requirements that the vibration damping device of the equipment needs to achieve.

[0039] Specifically, the information of the equipment to be vibration-damped includes but is not limited to the equipment weight, equipment size, equipment installation situation, equipment foot position, equipment vibration protection level, equipment vibration isolation frequency band requirements, maximum allowable offset when the equipment is operating, and equipment excitation load characteristics, etc. Among them, the equipment excitation load characteristics include but are not limited to the excitation load form and excitation load curve. The excitation load form includes unbalanced excitation force, unbalanced excitation torque, and combined action of unbalanced excitation force and torque. The excitation load curve includes the equipment excitation frequency distribution situation, excitation response peak information, etc.

[0040] In step S2, a finite element calculation model of the equipment - foundation - hull structure is established, and the design requirements of the vibration damping device are determined according to the vibration characteristics of the equipment to be detected and the vibration damping requirements of the equipment.

[0041] Further, in an embodiment of the present invention, step S2 specifically includes:

[0042] Step S201, establish a finite element calculation model of the equipment - foundation - hull structure according to the equipment to be vibration-damped, preset foundation, and preset hull structure information;

[0043] Step S202, determine whether the equipment operation meets the vibration requirements of the equipment operating environment in the state without the vibration damping device through the finite element calculation model of the equipment - foundation - hull structure. If it meets, there is no design requirement for the vibration damping device of the equipment to be vibration-damped. If it does not meet, the design requirements of the vibration damping device are clarified.

[0044] Specifically, according to the equipment to be vibration-damped, the preset base, and the preset hull structure information, a finite element calculation model of the equipment-base-hull structure is established. During the modeling process, the equipment can be simplified into a uniform cube structure with equal mass. The simplification of the base structure and the hull structure model must be consistent with the total mass and mass distribution of the original model, but the model can be reasonably truncated according to the calculation efficiency requirements. On the basis of establishing the structure model, the corresponding material properties are assigned to the structure model, including necessary material parameters such as the density of the structural material, damping, Young's modulus, Poisson's ratio, etc., to ensure that the material information of the established model is consistent with the actual structure. The boundary conditions are set according to the actual application situation. According to the calculation frequency band requirements, the finite element model is meshed, and it is necessary to ensure that the meshed model has sufficient calculation accuracy and high calculation efficiency.

[0045] Then, it is judged whether the operation of the equipment meets the vibration requirements of the equipment operation environment in the state without the vibration damping device. If it meets the requirements, it indicates that there is no design requirement for the vibration damping device for this equipment. If it does not meet the requirements, the design requirements for the vibration damping device can be further clarified. According to the equipment information and the design requirements of the vibration damping device, etc., the parameters of the vibration damping device are set.

[0046] In step S3, the parameters of the vibration damping device are determined according to the equipment information to be vibration-damped and the design requirements of the vibration damping device.

[0047] As Figure 2 and 3 shown, the vibration damping device mentioned in the embodiment of the present invention includes: a pressure-bearing panel sub-structure 1, a hinge 2, a liquid capsule layer 3, a liquid capsule partition 4, a molecular spring shock absorber 5, a bottom plate 6, and a limit groove 7. Among them, the design requirements of the vibration damping device mainly include the design of the vibration isolation liquid layer structure 2 and the design of the base panel 4. The limit groove 7 includes, but is not limited to, various types of limit devices that can limit the large displacement of the liquid capsule layer. The parameters of each component of the vibration damping device include the dimensions and placement positions of each device component such as the pressure-bearing panel, the liquid capsule layer, the liquid capsule partition, the molecular spring shock absorber, the bottom plate, and the limit groove.

[0048] It should be noted that the shock absorption principle of the surface wave and the molecular spring shock absorption device designed in the embodiment of the present invention is:

[0049] According to the water wave theory, the fluid particles in the wave perform simple harmonic motion in the horizontal and vertical directions. In the case of finite water depth, the fluid particles perform elliptical motion with the center of the ellipse being the equilibrium position. The wave energy is mainly concentrated on the liquid surface, and the energy of the standing wave decays rapidly in an exponential function with the increase of water depth. If a surface wave environment can be constructed on the surface of the ship vibration damping element, the vibration damping performance of the vibration damping element can be greatly improved. The molecular spring shock absorber is composed of water and porous hydrophobic materials. When an external force compresses the molecular spring medium to a certain pressure, water molecules invade the porous hydrophobic materials, and the stiffness of the molecular spring decreases. When unloading, the water molecules automatically escape from the micropores, realizing the mutual conversion of mechanical energy and surface energy. The molecular spring shock absorber generally exhibits the "high static and low dynamic" segmented stiffness characteristics. Therefore, if the wave energy conversion and energy level distribution characteristics of efficient vibration damping of surface waves and the "high static and low dynamic" characteristics of the molecular spring can be introduced into the design of ship vibration damping elements, the vibration damping effect can be greatly improved.

[0050] Further, in an embodiment of the present invention, step S3 specifically includes:

[0051] Step S301, determine the layout characteristics of the pressure-bearing panel according to the position of the equipment feet, the stiffness and stability requirements of the equipment. Among them, the layout characteristics of the pressure-bearing panel include the number, size, arrangement method and thickness of the pressure-bearing panel sub-structures. Specifically, according to the position of the equipment feet, initially determine the overall size of the pressure-bearing panel, and initially determine the number and arrangement position of the pressure-bearing panel sub-structures. At the same time, try to keep the position of the equipment feet at the center of the pressure-bearing panel sub-structures. The more the number of sub-panels, the smaller the vibration response of the structure, but the disassembly of the panel will also cause the aggravation of the vibration of the upper layer of the device. Therefore, it is recommended that the ratio of the number of panels to the number of feet be 1-2; according to the stiffness and stability requirements of the equipment, initially determine the thickness of the pressure-bearing panel. Increasing the thickness of the pressure-bearing panel can reduce the structural response, and at the same time can improve the stability of the equipment and the stiffness of the vibration damping device, but the increase in the thickness of the pressure-bearing panel will also increase the weight of the device;

[0052] Step S302: Determine the layout characteristics of the liquid capsule layer according to the layout characteristics of the pressure-bearing panel and the excitation characteristics of the equipment. The layout characteristics of the liquid capsule layer include the coverage range of the liquid capsule layer, the number of liquid capsules, the thickness of the liquid capsule layer, and the liquid contained in the liquid capsule. Specifically, determine the coverage range of the liquid capsule layer according to the overall size of the pressure-bearing panel. The larger the percentage of the coverage range of the liquid capsule layer occupying the pressure-bearing panel is, the better the vibration isolation effect is not. And the contact area of the liquid capsule layer should at least cover the area surrounded by the excitation of the equipment feet. Determine the number of liquid capsules according to the number of sub-structures of the pressure-bearing panel and their layout positions. The increase in the number of liquid capsules in the liquid capsule layer can effectively reduce the structural vibration response. After replacing a large-sized liquid capsule with multiple small liquid capsules according to the excitation position, the overall vibration isolation level will be improved, but at the same time, its low-frequency vibration isolation effect will be relatively weakened. Considering that increasing the number of liquid capsules will make the raft structure more complex and the manufacturing cost will increase, according to the actual engineering situation, it is recommended to choose large-sized liquid capsules or a combination of liquid capsules of multiple sizes. Determine the thickness of the liquid capsule layer according to the excitation characteristics of the equipment and the equipment stability requirements. The thickness of the liquid capsule layer will improve the vibration isolation effect of the device. However, as the thickness of the device increases, the instability of the equipment will increase. For equipment with certain stability requirements, the thickness of the liquid capsule layer should not be too large. Determine the liquid contained in the liquid capsule according to the fluctuation characteristics of the fluid medium. The reduction of the liquid density in the liquid capsule and the increase of the liquid dynamic viscosity coefficient can effectively reduce the vibration response level of the structure and will have a better vibration isolation effect.

[0053] Step S303: Determine the size and number of molecular spring shock absorbers according to the layout characteristics of the liquid capsule layer and the low-frequency vibration reduction requirements of the equipment. Specifically, the increase in the effective compression area of the molecular spring shock absorber can effectively increase the stiffness of each section of the molecular spring. And the stiffness of the working section of the molecular spring shock absorber decreases with the increase in the filling mass of the porous hydrophobic material. The performance of the molecular spring shock absorber can be flexibly adjusted by changing parameters to meet the vibration reduction and isolation requirements of different equipment.

[0054] Step S304: Determine the sizes of the liquid capsule partition and the limit groove according to the coverage range and thickness of the liquid capsule layer. The liquid capsule partition and the limit groove should be slightly larger than the coverage range of the liquid capsule layer. At the same time, the height of the limit groove should be lower than the height of the pressure-bearing panel to avoid contact between the pressure-bearing panel and the limit groove.

[0055] In step S4, input the parameters of the vibration reduction device into the finite element calculation model of the equipment - foundation - hull structure, and use the acceleration vibration level drop as the evaluation index to judge whether the acceleration vibration level drop meets the design requirements of the vibration reduction device. If it meets, determine the final form of the vibration reduction device. If it does not meet, return to step S3 to redesign the parameters of the vibration reduction device until the design is satisfied.

[0056] Furthermore, in an embodiment of the present invention, step S4 specifically includes:

[0057] Step S401: Based on the shock absorption device parameters and the actual structural dimensions in the finite element calculation model of the equipment-pedestal-hull structure, establish an initial vibration isolation and shock absorption evaluation structural model of the equipment-device-pedestal-hull structure in the finite element simulation software. The initial vibration isolation and shock absorption evaluation structural model of the equipment-device-pedestal-hull structure includes: an equipment simplified model, a shock absorption device model, a pedestal model, a hull structure model, and a vibration and sound radiation system evaluation model, ensuring that the structural form and dimensions of the established model are consistent with the actual structure. Among them, the equipment model can be equivalently replaced by a cube of equal mass. The simplification process of the model must maintain the same total mass as the original model and the same mass distribution, and the model can be reasonably truncated according to the calculation efficiency requirements.

[0058] Step S402: Based on the shock absorption device parameters, the actual material information, and the actual boundaries in the finite element calculation model of the equipment-pedestal-hull structure, assign the material properties to the initial vibration isolation and shock absorption evaluation structural model of the equipment-device-pedestal-hull structure, and set boundary adjustments to obtain the finite element vibration isolation and shock absorption evaluation model of the equipment-device-pedestal-hull structure. The material properties include necessary material parameters such as the density of the structural material, damping, Young's modulus, and Poisson's ratio, ensuring that the material information of the established model is consistent with the actual structure. When setting the boundary conditions of the model, it should be ensured that the boundary conditions of the established model are consistent with the boundary conditions in actual applications.

[0059] Step S403: According to the calculation requirements, divide the finite element network of the finite element vibration isolation and shock absorption evaluation model of the equipment-device-pedestal-hull structure, calculate the simulation calculation results, and then solve the acceleration vibration level drop. When dividing the finite element mesh of the finite element model, it should be ensured that the model after mesh division has sufficient calculation accuracy.

[0060] Step S404: Using the acceleration vibration level drop as an evaluation index, determine whether the acceleration vibration level drop meets the design requirements of the shock absorption device. If it meets, determine the final form of the shock absorption device; if it does not meet, return to Step S3 to reset the shock absorption device parameters until it is satisfied.

[0061] As Figure 4 shown, it is a comparison chart of the underwater radiated noise of the ship before and after adopting the laminated composite shock absorption device designed in the embodiment of the present invention through simulation calculation. Two numerical simulation models with and without considering the spring shock absorption system are established respectively. The results show that the shock absorption device designed considering the embodiment of the present invention can effectively reduce the ship radiated noise by 8 - 12 dB.

[0062] In summary, the laminated composite shock absorption method based on surface waves and molecular springs proposed in the embodiment of the present invention can perform quantitative calculations and effectively evaluate the vibration isolation and shock absorption effects. The process is simple, has high versatility, can improve the design efficiency of shock absorption devices, has good practicability and a wide range of application fields, and is convenient for technology promotion.

[0063] Next, a laminated composite vibration damping system based on surface waves and molecular springs for vibration damping according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0064] Figure 5 FIG. 5 is a schematic structural diagram of a laminated composite vibration damping system based on surface waves and molecular springs for vibration damping according to an embodiment of the present invention.

[0065] As Figure 5 shown, the system 100 includes: a device vibration damping requirement determination module 101, a vibration damping device design requirement determination module 102, a vibration damping device parameter determination module 103, and a vibration damping device final form determination module 104.

[0066] Among them, the device vibration damping requirement determination module 101 is used to obtain the device vibration damping requirements according to the information of the device to be vibration damped. Among them, the device vibration damping requirements include the vibration requirements of the device operating environment and the vibration damping level requirements that the device vibration damping device needs to achieve. The vibration damping device design requirement determination module 102 is used to establish a finite element calculation model of the device - base - hull structure, and determine the vibration damping device design requirements according to the vibration characteristics of the device to be detected and the device vibration damping requirements. The vibration damping device parameter determination module 103 is used to determine the vibration damping device parameters according to the information of the device to be vibration damped and the vibration damping device design requirements. The vibration damping device final form determination module 104 is used to input the vibration damping device parameters into the finite element calculation model of the device - base - hull structure, and use the acceleration vibration level drop as an evaluation index to determine whether the acceleration vibration level drop meets the vibration damping device design requirements. If it meets, the final form of the vibration damping device is determined. If it does not meet, it returns to the vibration damping device parameter determination module to redesign the vibration damping device parameters until the design is satisfied.

[0067] Furthermore, in an embodiment of the present invention, the vibration damping device design requirement determination module 102 specifically includes:

[0068] A first model construction unit, which is used to establish a finite element calculation model of the device - base - hull structure according to the information of the device to be vibration damped, the preset base, and the preset hull structure;

[0069] A vibration damping device design requirement clarification unit, which is used to determine whether the device operation meets the vibration requirements of the device operating environment in the state without a vibration damping device through the finite element calculation model of the device - base - hull structure. If it meets, there is no vibration damping device design requirement for the device to be vibration damped. If it does not meet, the vibration damping device design requirements are clarified.

[0070] Furthermore, in an embodiment of the present invention, the vibration damping device parameter determination module 103 specifically includes:

[0071] The first parameter determination unit is configured to determine the layout characteristics of the pressure-bearing panel according to the positions of the equipment feet and the requirements for the stiffness and stability of the equipment. The layout characteristics of the pressure-bearing panel include the number, size, arrangement mode, and thickness of the pressure-bearing panel substructures;

[0072] The second parameter determination unit is configured to determine the layout characteristics of the liquid capsule layer according to the layout characteristics of the pressure-bearing panel and the excitation characteristics of the equipment. The layout characteristics of the liquid capsule layer include the coverage range of the liquid capsule layer, the number of liquid capsules, the thickness of the liquid capsule layer, and the liquid contained in the liquid capsules;

[0073] The third parameter determination unit is configured to determine the size and number of the molecular spring shock absorbers according to the layout characteristics of the liquid capsule layer and the low-frequency vibration reduction requirements of the equipment;

[0074] The fourth parameter determination unit is configured to determine the sizes of the liquid capsule partition plates and the limit grooves according to the coverage range and thickness of the liquid capsule layer.

[0075] Further, in an embodiment of the present invention, the unit 104 for clarifying the design requirements of the vibration reduction device includes:

[0076] The initial model construction unit is configured to establish an initial vibration isolation and reduction evaluation structure model of the equipment-device-base-hull structure in the finite element simulation software according to the vibration reduction device parameters and the actual structural dimensions in the finite element calculation model of the equipment-base-hull structure;

[0077] The second model construction unit is configured to endow the initial vibration isolation and reduction evaluation structure model of the equipment-device-base-hull structure with material properties according to the vibration reduction device parameters and the actual material information and actual boundaries in the finite element calculation model of the equipment-base-hull structure, and set boundary adjustments to obtain a finite element vibration isolation and reduction evaluation model of the equipment-device-base-hull structure;

[0078] The solving unit is configured to divide the finite element network of the finite element vibration isolation and reduction evaluation model of the equipment-device-base-hull structure according to the calculation requirements, calculate the simulation calculation results, and further solve the acceleration vibration level drop;

[0079] The unit for determining the final form of the vibration reduction device is configured to use the acceleration vibration level drop as an evaluation index to determine whether the acceleration vibration level drop meets the design requirements of the vibration reduction device. If it meets, the final form of the vibration reduction device is determined. If it does not meet, return to step S3 to reset the vibration reduction device parameters until it meets.

[0080] It should be noted that the foregoing explanation of the embodiments of the laminated composite vibration reduction method based on surface waves and molecular springs also applies to the system of this embodiment, and will not be elaborated here.

[0081] The laminated composite vibration damping system based on surface wave and molecular spring vibration damping proposed according to the embodiments of the present invention can perform quantitative calculations and effectively evaluate the vibration isolation and damping effects. The process is simple, has high versatility, can improve the design efficiency of vibration damping devices, has good practicability and a wide range of application fields, and is convenient for technology promotion.

[0082] To implement the above embodiments, the present invention also provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements the laminated composite vibration damping method based on surface wave and molecular spring vibration damping as described in the foregoing embodiments.

[0083] To implement the above embodiments, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the laminated composite vibration damping method based on surface wave and molecular spring vibration damping as described in the foregoing embodiments.

[0084] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0085] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0086] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of the present invention includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0087] The logic and / or steps represented in the flowchart or otherwise described herein can, for example, be considered as a definitional sequence list of executable instructions for implementing logical functions, which can be embodied specifically in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in conjunction with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection part (electronic device) having one or N wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0088] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0089] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of the above-described embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0090] In addition, each functional unit in various embodiments of the present invention may be integrated into a processing module, may exist physically alone for each unit, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0091] The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A laminated composite vibration damping method based on surface waves and molecular spring vibration damping, characterized in that It includes the following steps: Step S1: Obtain the equipment vibration reduction requirements according to the information of the equipment to be vibration-reduced. Among them, the equipment vibration reduction requirements include the vibration requirements of the equipment operating environment and the vibration reduction level requirements that the equipment vibration reduction device needs to achieve; Step S2: Establish a finite element calculation model of the equipment - base - hull structure, and determine the design requirements of the vibration reduction device according to the vibration characteristics of the equipment to be detected and the equipment vibration reduction requirements; Step S3: Determine the parameters of the vibration reduction device according to the information of the equipment to be vibration-reduced and the design requirements of the vibration reduction device; Step S4: Input the parameters of the vibration reduction device into the finite element calculation model of the equipment - base - hull structure. Taking the acceleration vibration level drop as the evaluation index, judge whether the acceleration vibration level drop meets the design requirements of the vibration reduction device. If it meets, determine the final form of the vibration reduction device. If it does not meet, return to Step S3 to redesign the parameters of the vibration reduction device until the design is satisfied; The specific content of Step S3 includes: Step S301: Determine the layout characteristics of the pressure-bearing panel according to the position of the equipment feet, the stiffness and stability requirements of the equipment. Among them, the layout characteristics of the pressure-bearing panel include the number, size, arrangement method and thickness of the pressure-bearing panel substructures; Step S302: Determine the layout characteristics of the liquid chamber layer according to the layout characteristics of the pressure-bearing panel and the excitation characteristics of the equipment. Among them, the layout characteristics of the liquid chamber layer include the coverage range of the liquid chamber layer, the number of liquid chambers, the thickness of the liquid chamber layer and the liquid contained in the liquid chambers; Step S303: Determine the size and number of the molecular spring shock absorbers according to the layout characteristics of the liquid chamber layer and the low-frequency vibration reduction requirements of the equipment; Step S304: Determine the sizes of the liquid chamber partitions and the limit grooves according to the coverage range and thickness of the liquid chamber layer.

2. The laminated composite vibration damping method based on surface wave and molecular spring vibration damping according to claim 1, wherein The specific content of Step S2 includes: Step S201: Establish the finite element calculation model of the equipment - base - hull structure according to the equipment to be vibration-reduced, the preset base and the preset hull structure information; Step S202: Judge whether the equipment operation meets the vibration requirements of the equipment operating environment in the state without the vibration reduction device through the finite element calculation model of the equipment - base - hull structure. If it meets, there is no design requirement for the vibration reduction device for the equipment to be vibration-reduced. If it does not meet, clarify the design requirements of the vibration reduction device.

3. The laminated composite vibration damping method based on surface wave and molecular spring vibration damping according to claim 1, wherein The specific content of Step S4 includes: Step S401: Establish an initial vibration isolation and reduction evaluation structure model of the equipment - device - base - hull structure in the finite element simulation software according to the parameters of the vibration reduction device and the actual structural dimensions in the finite element calculation model of the equipment - base - hull structure; Step S402: Endow the initial vibration isolation and reduction evaluation structure model of the equipment - device - base - hull structure with material properties according to the parameters of the vibration reduction device, the actual material information and the actual boundaries in the finite element calculation model of the equipment - base - hull structure, and set boundary adjustment to obtain the finite element vibration isolation and reduction evaluation model of the equipment - device - base - hull structure; Step S403: Divide the finite element network for the finite element vibration isolation and reduction evaluation model of the equipment - device - base - hull structure according to the calculation requirements, calculate the simulation calculation results, and then solve the acceleration vibration level drop; Step S404: Using the acceleration vibration level drop as an evaluation index, determine whether the acceleration vibration level drop meets the design requirements of the vibration damping device. If it meets, determine the final form of the vibration damping device; if not, return to step S3 to reset the parameters of the vibration damping device until it meets the requirements.

4. A laminated composite vibration damping system based on surface wave and molecular spring vibration damping, characterized in that, Including: A device vibration damping requirement determination module, configured to obtain the device vibration damping requirements according to the information of the device to be vibration damped, where the device vibration damping requirements include the vibration requirements of the device operation environment and the vibration damping level requirements that the device vibration damping device needs to achieve; A vibration damping device design requirement determination module, configured to establish a finite element calculation model of the device - base - hull structure, and determine the design requirements of the vibration damping device according to the vibration characteristics of the device to be detected and the device vibration damping requirements; A vibration damping device parameter determination module, configured to determine the parameters of the vibration damping device according to the information of the device to be vibration damped and the design requirements of the vibration damping device; A vibration damping device final form determination module, configured to input the vibration damping device parameters into the finite element calculation model of the device - base - hull structure, and use the acceleration vibration level drop as an evaluation index to determine whether the acceleration vibration level drop meets the design requirements of the vibration damping device. If it meets, determine the final form of the vibration damping device; if not, return to the vibration damping device parameter determination module to redesign the parameters of the vibration damping device until the design meets the requirements; The vibration damping device parameter determination module specifically includes: A first parameter determination unit, configured to determine the layout characteristics of the pressure - bearing panel according to the position of the equipment feet, the stiffness and stability requirements of the equipment, where the layout characteristics of the pressure - bearing panel include the number, size, arrangement method and thickness of the pressure - bearing panel sub - structures; A second parameter determination unit, configured to determine the layout characteristics of the liquid chamber layer according to the layout characteristics of the pressure - bearing panel and the excitation characteristics of the equipment, where the layout characteristics of the liquid chamber layer include the coverage range of the liquid chamber layer, the number of liquid chambers, the thickness of the liquid chamber layer and the liquid contained in the liquid chambers; A third parameter determination unit, configured to determine the size and number of the molecular spring shock absorbers according to the layout characteristics of the liquid chamber layer and the low - frequency vibration damping requirements of the equipment; A fourth parameter determination unit, configured to determine the sizes of the liquid chamber partition and the limit groove according to the coverage range and thickness of the liquid chamber layer.

5. The laminated composite vibration damping system based on surface wave and molecular spring vibration damping according to claim 4, characterized in that, The vibration damping device design requirement determination module specifically includes: A first model construction unit, configured to establish the finite element calculation model of the device - base - hull structure according to the information of the device to be vibration damped, the preset base and the preset hull structure; A unit for clarifying the design requirements of the vibration damping device, configured to determine whether the device operation meets the vibration requirements of the device operation environment in the state without the vibration damping device through the finite element calculation model of the device - base - hull structure. If it meets, there is no design requirement for the vibration damping device for the device to be vibration damped; if not, clarify the design requirements of the vibration damping device.

6. The laminated composite vibration damping system based on surface wave and molecular spring vibration damping according to claim 4, characterized in that, The unit for clarifying the design requirements of the vibration damping device includes: An initial model construction unit, configured to establish an initial vibration isolation and damping evaluation structure model of the device - device - base - hull structure in the finite element simulation software according to the vibration damping device parameters and the actual structure sizes in the finite element calculation model of the device - base - hull structure; The second model construction unit is configured to endow the initial equipment-device-base-hull structure vibration isolation and reduction evaluation structure model with material properties according to the vibration damping device parameters, the actual material information, and the actual boundaries in the equipment-base-hull structure finite element calculation model, and set boundary adjustment to obtain an equipment-device-base-hull structure finite element vibration isolation and reduction evaluation model; The solution unit is configured to divide a finite element network for the equipment-device-base-hull structure finite element vibration isolation and reduction evaluation model according to calculation requirements, calculate simulation calculation results, and further solve the acceleration vibration level drop; The unit for determining the final form of the vibration damping device is configured to use the acceleration vibration level drop as an evaluation index to determine whether the acceleration vibration level drop meets the design requirements of the vibration damping device. If it meets the requirements, the final form of the vibration damping device is determined. If it does not meet the requirements, return to step S3 to reset the vibration damping device parameters until it meets the requirements.

7. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements the laminated composite vibration damping method based on surface waves and molecular springs as described in any one of claims 1-3.

8. A non-transitory computer-readable storage medium storing a computer program thereon, characterized in that, When the computer program is executed by the processor, it implements the laminated composite vibration damping method based on surface waves and molecular springs as described in any one of claims 1-3.

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