CN116221320A - Ship equipment vibration reduction device and method based on surface wave vibration reduction - Google Patents
Ship equipment vibration reduction device and method based on surface wave vibration reduction Download PDFInfo
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- CN116221320A CN116221320A CN202310198203.5A CN202310198203A CN116221320A CN 116221320 A CN116221320 A CN 116221320A CN 202310198203 A CN202310198203 A CN 202310198203A CN 116221320 A CN116221320 A CN 116221320A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
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Abstract
The invention discloses a vibration damping device and a vibration damping method for ship equipment based on surface wave vibration damping, belonging to the technical field of ship vibration damping and noise reduction, wherein the device comprises: the vibration damping device comprises a pressure-bearing panel, a liquid bag layer, a vibration damping liquid bag, a bottom plate and a limiting groove, wherein the pressure-bearing panel is arranged above the liquid bag layer, and the top of the pressure-bearing panel is provided with a supporting end face which is directly connected with equipment to be damped; the liquid sac layer is arranged in the limit groove; the vibration reduction liquid bag is arranged inside the liquid bag layer; the bottom plate is arranged below the liquid bag layer and is directly fixedly connected with the ship base panel by bolts; the limiting groove is a groove structure extending upwards from the circumferential position of the bottom plate; the height of the limiting groove is lower than the thickness of the liquid sac layer, and the limiting groove is not in direct contact with the pressure-bearing panel. The device can effectively realize high-efficiency vibration reduction of ship equipment, and has the advantages of simple structure, good vibration reduction effect and wide application range.
Description
Technical Field
The invention relates to the technical field of ship vibration damping and noise reduction, in particular to a device and a method for damping ship equipment based on surface wave vibration damping.
Background
The research shows that the ship radiation noise mainly has three sources, namely mechanical noise, hydrodynamic noise and propeller noise, and the mechanical noise caused by the vibration of ship equipment such as a main engine, a generator and the like is the most main noise source of the ship in a low-speed running state, and the proportion of the ship radiation noise in the total radiation noise of the ship can reach about seven. The strong vibration noise not only causes discomfort of personnel on the ship, but also damages the concealment of the ship, and also influences the normal operation of other equipment and instruments in the ship and personnel work, thereby bringing potential safety hazard for navigation and even causing loss which is difficult to measure. Therefore, effective control of structural vibrations caused by mechanical equipment is a primary task to reduce the radiated noise level of a ship and to improve the vitality and comfort of the ship.
According to the water wave theory, fluid particles in waves do simple harmonic motion in the horizontal and vertical directions, limited water deep water particles do elliptical motion, the center of the ellipse is a balance position, wave energy is mainly concentrated on the surface of liquid, standing wave energy is attenuated rapidly in an exponential function along with the increase of water depth, and if a surface wave environment is constructed on a ship vibration reduction element, the vibration reduction performance of the vibration reduction element can be greatly improved. The vibration damping liquid bag consists of water and a porous hydrophobic material, and when the vibration damping liquid bag is compressed by external force, water molecules invade the porous hydrophobic material; when unloading, water molecules automatically escape from the micropores, so that the mutual conversion of mechanical energy and surface energy is realized. Therefore, if the wave energy conversion, the energy level distribution characteristic and the vibration damping liquid bag vibration damping characteristic of the surface wave efficient vibration damping are introduced into the design of the ship vibration damping element, the vibration damping effect can be greatly improved.
The related art disclosed mainly includes: related art one, a full-rotation rudder propeller double-layer vibration damper and its design method (CN 106114797A), it includes the installation rack of the full-rotation rudder propeller device, a plurality of vibration damper blocks with three-way rigidity, vibration damper block housing fixed vibration damper blocks and playing a limiting role to the full-rotation rudder propeller device, and base structure for installing vibration damper block housing, etc. which are evenly arranged along the periphery of the upper and lower panels of the installation rack. The vibration damping device can simultaneously and effectively damp vertical, transverse, longitudinal, torsional and lotus vibrations of the full-rotation rudder propeller device, and because a plurality of vibration damping blocks are uniformly distributed along the periphery of the mounting rack and are divided into an upper layer and a lower layer, the deformation of the vibration damping blocks caused by the torque of an input shaft and the propelling force of a propeller can be simultaneously and effectively controlled, the problem of dynamic deformation of the input shaft of the rudder propeller device is solved, and the vibration transmitted to a rudder structure by the rudder propeller device is reduced, so that the running stability is improved.
A semi-active vibration damping base and a control method (CN 104565163A) are disclosed, the scheme comprises an upper end plate and a lower end plate, a plurality of cylindrical particle dampers are arranged between the upper end plate and the lower end plate, solid particles are placed in the particle dampers, coils are sleeved outside the particle dampers, the coils are connected with a controller, the controller is connected with the lower end plate through a sensor, and the particle dampers, the coils and the controller form a closed current loop. When the vibration frequency of the structural body of the scheme is in a low frequency band, particles positioned at the upper half part in the particle damper are excited to participate in consumption of vibration energy, particles with liquid properties are magnetized by a magnetic field in an electrified coil, so that attractive force among the particles is enhanced, friction is increased, the upper half part of particles move up and down, and meanwhile, the lower half part of particles are indirectly driven to move by means of hysteresis force, so that the lower half part of particles also participate in collision and friction in the low frequency band.
In view of the foregoing, there is a need for a vibration damping device with a simple structure and good vibration damping effect, particularly low frequency vibration damping effect.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
To this end, an object of the present invention is to propose a damping device for a marine installation based on surface wave damping.
To this end, another object of the invention is to propose a method for damping a marine installation based on surface wave damping.
It is a further object of the invention to propose a computer device.
It is a further object of the invention to propose a non-transitory computer readable storage medium.
To achieve the above object, an embodiment of a first aspect of the present invention provides a vibration damping device for a ship apparatus based on surface wave vibration damping, including: the vibration damping device comprises a pressure-bearing panel, a liquid bag layer, a vibration damping liquid bag, a bottom plate and a limiting groove, wherein the pressure-bearing panel is arranged above the liquid bag layer, and the top of the pressure-bearing panel is provided with a supporting end face which is directly connected with equipment to be damped; the liquid sac layer is arranged in the limit groove; the vibration reduction liquid bag is arranged inside the liquid bag layer; the bottom plate is arranged below the liquid bag layer and is directly fixedly connected with the ship base panel by bolts; the limiting groove is of a groove type structure extending upwards from the circumferential position of the bottom plate; the height of the limiting groove is lower than the thickness of the liquid bag layer, and the limiting groove is not in direct contact with the pressure-bearing panel.
According to the ship equipment vibration damper based on surface wave vibration damping, disclosed by the embodiment of the invention, the pressure-bearing panel is discontinuously processed, long waves propagated in the solid are converted into short waves through the hinge, and the conversion from low-frequency vibration to high-frequency vibration is realized; the liquid bag layer converts elastic waves in the solid into surface waves, so that efficient vibration reduction is realized; the vibration damping liquid bag consists of water and a porous hydrophobic material, and water molecules repeatedly enter and exit the porous hydrophobic material under the action of pressure, so that the mutual conversion of mechanical energy and surface energy can be realized, and the energy dissipation is realized; the vibration damper can effectively realize high-efficiency vibration damping of ship equipment, and has the advantages of simple structure, good vibration damping effect, wide application range and the like; the vibration damping method has higher universality, good practicability and wide application field, and is convenient for technical popularization.
In addition, the vibration damping device for a ship apparatus based on surface wave vibration damping according to the above embodiment of the present invention may further have the following additional technical features:
further, in one embodiment of the present invention, the pressure-bearing panel includes a plurality of sub-panels, each of which is connected by a hinge, and converts long waves into short waves through the hinge.
Further, in one embodiment of the present invention, the liquid bag layer includes a super elastic material bag body and a content liquid, the pressure-bearing panel applies a surface force to the liquid bag layer, the elastic wave is transferred to the liquid bag to form a limited water surface wave, and the wave energy is concentrated on the liquid surface and decays rapidly with an exponential function as the water depth increases.
Further, in one embodiment of the present invention, the vibration damping fluid bladder is comprised of water and a porous hydrophobic material, with water molecules passing into and out of the porous hydrophobic material for vibration energy dissipation.
To achieve the above object, an embodiment of a second aspect of the present invention provides a method for damping a ship device based on surface wave damping, comprising the steps of: step S1, establishing a finite element model of an equipment-base-hull structure according to a preset ship mechanical equipment type, and acquiring equipment vibration reduction device design requirements by combining preset ship equipment vibration reduction index requirements; step S2, combining the design requirement of the equipment vibration damper with the design rule of the ship equipment vibration damper based on surface wave vibration damping to design the parameters of each component of the ship equipment vibration damper based on surface wave vibration damping; and S3, inputting the parameters of each component into the finite element model of the equipment-base-hull structure, and evaluating whether the vibration damping effect of the ship equipment vibration damping device based on the surface wave vibration damping meets the preset equipment vibration damping requirement by taking the vibration acceleration level and the vibration level drop as vibration damping effect evaluation indexes, and if not, returning to the step S2 to redesign the parameters of each component until the design is met.
According to the ship equipment vibration reduction method based on surface wave vibration reduction, the pressure-bearing panel is discontinuously processed, long waves propagated in the solid are converted into short waves through the hinge, and low-frequency vibration is converted into high frequency; the liquid bag layer converts elastic waves in the solid into surface waves, so that efficient vibration reduction is realized; the vibration damping liquid bag consists of water and a porous hydrophobic material, and water molecules repeatedly enter and exit the porous hydrophobic material under the action of pressure, so that the mutual conversion of mechanical energy and surface energy can be realized, and the energy dissipation is realized; the vibration damper can effectively realize high-efficiency vibration damping of ship equipment, and has the advantages of simple structure, good vibration damping effect, wide application range and the like; the vibration damping method has higher universality, good practicability and wide application field, and is convenient for technical popularization.
In addition, the method for damping the ship equipment based on the surface wave damping according to the embodiment of the invention can also have the following additional technical characteristics:
further, in one embodiment of the present invention, the step S1 specifically includes: step S101, determining equipment vibration reduction index requirements according to preset ship mechanical equipment types; step S102, establishing a finite element model of the equipment-base-hull structure according to the equipment, base and hull structure information; step S103, calculating the vibration characteristics of the system by taking the vibration acceleration level and the vibration level fall as evaluation indexes; step S104, determining the design requirement of the vibration damper according to the comparison result of the vibration characteristic of the system and the vibration damper index requirement of the equipment.
Further, in one embodiment of the present invention, the step S2 specifically includes: step S201, determining the rigidity requirement of the ship equipment vibration reduction device based on surface wave vibration reduction according to the equipment mass and the momentum characteristic during operation; step S202, determining the number and arrangement modes of the bearing panel substructures of the ship equipment vibration damper based on surface wave vibration damping according to the equipment machine leg positions and the excitation characteristics; step S203, determining the coverage range, the number, the thickness and the content liquid of liquid bags of the liquid bag layer of the vibration damping device of the ship equipment based on surface wave vibration damping according to the number and the arrangement mode of the bearing panel substructures; step S204, determining the size and the number of vibration reduction liquid bags of the vibration reduction device of the ship equipment based on surface wave vibration reduction according to the coverage range of the liquid bag layers, the number of the liquid bags, the thickness of the liquid bag layers, the liquid content of the liquid bags and the low-frequency vibration reduction requirement of preset equipment; step S205, determining the size of a limit groove of the vibration damper of the ship equipment based on surface wave vibration damping according to the coverage range and the thickness of the liquid sac layer.
Further, in one embodiment of the present invention, the step S3 specifically includes: step S301, building a finite element model of the equipment-vibration damper-base-hull structure according to the finite element model of the equipment-base-hull structure and the component parameters, and calculating the vibration acceleration level and the vibration level drop; and step S302, comparing the vibration acceleration level and the vibration level drop with the equipment vibration reduction index requirement and the vibration reduction device design requirement, and returning to the step S2 to redesign the parameters of each component until the parameters are met if the parameters are not met.
In a further aspect, the embodiment of the invention provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to implement the method for damping the vibration of the ship device based on the surface wave vibration damping according to the embodiment.
In a further aspect, the present invention provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for damping a marine device based on surface wave damping as described in the above embodiments.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural view of a vibration damping device for a surface wave vibration damping-based marine apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a marine installation vibration damping device based on surface wave vibration damping according to one embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a marine installation vibration damping device based on surface wave vibration damping according to another embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a vibration damping fluid bladder of a surface wave vibration damping-based marine apparatus vibration damping device according to one embodiment of the present invention;
FIG. 5 is a flow chart of a method of damping marine equipment based on surface wave damping in accordance with one embodiment of the present invention.
Reference numerals illustrate:
1-bearing panel substructure, 2-hinge, 3-liquid sac layer, 4-vibration damping liquid sac, 5-bottom plate, 6-limit groove and 7-porous hydrophobic material.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following describes a vibration damping device and a vibration damping method for a ship device based on surface wave vibration damping according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a vibration damping device for a surface wave vibration damping-based marine apparatus according to an embodiment of the present invention.
As shown in fig. 1, the apparatus includes: the damping device comprises a pressure-bearing panel substructure 1, a hinge 2, a liquid sac layer 3, a damping liquid sac 4, a bottom plate 5 and a limiting groove 6.
The pressure-bearing panels are discontinuously processed, the pressure-bearing panel substructures 1 are connected by hinges 2 to form the pressure-bearing panels, long waves transmitted in the solid are converted into short waves through the hinges, and low-frequency vibration is converted into high-frequency vibration.
Further, the liquid bag layer 3 comprises a liquid bag, the liquid bag comprises a super-elastic material bag body and content liquid, the liquid bag layer 3 is arranged below a pressure-bearing panel, the pressure-bearing panel acts surface force on the liquid bag, elastic waves are transmitted to the liquid bag to form limited water surface waves, the surface wave environment is formed inside the liquid bag, wave energy is mainly concentrated on the surface of the liquid, standing wave energy is rapidly attenuated in an exponential function along with the increase of water depth, and therefore efficient vibration reduction is achieved.
Further, as shown in fig. 2, 3 and 4, the vibration damping liquid bag 4 is arranged inside the liquid bag, two ends of the vibration damping liquid bag 4 are in contact with the upper and lower inner surfaces of the liquid bag, the vibration damping liquid bag 4 is composed of water and porous hydrophobic materials, and under the action of pressure, water molecules enter and exit the porous hydrophobic materials to dissipate vibration energy, so that the mutual conversion of mechanical energy and surface energy can be realized.
Still further, in order to avoid the liquid sac layer 3 from being greatly deflected under pressure, the limiting groove 6 is extended upwards in the circumferential direction of the bottom plate 5, the height of the limiting groove 6 is lower than the thickness of the liquid sac layer 3, and the limiting groove 6 is not in direct contact with the pressure-bearing panel.
According to the ship equipment vibration damper based on surface wave vibration damping, which is provided by the embodiment of the invention, the pressure-bearing panel is discontinuously processed, long waves propagated in the solid are converted into short waves through the hinge, and the conversion from low-frequency vibration to high-frequency vibration is realized; the liquid bag layer converts elastic waves in the solid into surface waves, so that efficient vibration reduction is realized; the vibration damping liquid bag consists of water and a porous hydrophobic material, and water molecules repeatedly enter and exit the porous hydrophobic material under the action of pressure, so that the mutual conversion of mechanical energy and surface energy can be realized, and the energy dissipation is realized; the vibration damper can effectively realize high-efficiency vibration damping of ship equipment, and has the advantages of simple structure, good vibration damping effect, wide application range and the like; the vibration damping method has higher universality, good practicability and wide application field, and is convenient for technical popularization.
Next, a method for damping a ship device based on surface wave damping according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 5 is a flow chart of a method of damping marine equipment based on surface wave damping in accordance with one embodiment of the present invention.
As shown in fig. 5, the method for damping the surface wave damping-based ship equipment comprises the following steps:
in step S1, a finite element model of the equipment-base-hull structure is built according to a preset type of the ship mechanical equipment, and the design requirements of the equipment vibration reduction device are obtained by combining with the preset vibration reduction index requirements of the ship equipment.
Further, in one embodiment of the present invention, step S1 specifically includes:
step S101, determining equipment vibration reduction index requirements according to the type of the preset ship mechanical equipment.
It is understood that the preset equipment type includes ship mechanical equipment with vibration reduction requirement, and the equipment information to be clarified includes, but is not limited to equipment weight, equipment size, equipment installation condition, equipment vibration protection level, equipment vibration isolation frequency band requirement, maximum allowable offset when the equipment operates, equipment excitation load characteristic and the like; the equipment vibration reduction index requirements comprise equipment running environment vibration index requirements and vibration reduction level requirements which are required to be achieved by the equipment vibration reduction device.
Step S102, building a finite element model of the equipment-base-hull structure according to the equipment, base and hull structure information.
In the modeling process, equipment can be simplified into a mean cube structure with equal mass, and the simplified treatment of a base structure and a hull structure model must keep consistent with the total mass and mass distribution of an original model, but the model can be reasonably cut off according to the calculation efficiency requirement; on the basis of building a structural model, endowing the structural model with corresponding material properties including necessary material parameters such as structural material density, damping, young's modulus, poisson's ratio and the like, and ensuring that the built model material information is consistent with an actual structure; setting boundary conditions according to actual application conditions; according to the calculation frequency band requirement, the finite element model is subjected to grid division, and the model subjected to grid division needs to be ensured to have enough calculation precision and higher calculation efficiency.
And step S103, calculating the vibration characteristics of the system by taking the vibration acceleration level and the vibration level drop as evaluation indexes.
Specifically, a plurality of evenly distributed reference points are selected on the base panel and the hull structure respectively as excitation points and response pickup points, and the reference points are selected based on the actual structural dimensions of the base panel and the hull structure, so that the base panel and the hull structure are evenly distributed on each part of the structure.
Step S104, determining the design requirement of the vibration damper according to the comparison result of the vibration characteristic of the system and the vibration damper index requirement of the equipment.
Specifically, if the vibration acceleration level and the vibration level drop obtained by calculation in step S103 meet the vibration index requirement of the equipment operating environment, it is indicated that vibration damping design may not be required, and if the vibration acceleration level and the vibration level drop do not meet the index requirement, the design requirement of the vibration damper is determined according to whether the vibration acceleration level and the vibration level drop meet the index requirement, including the vibration level drop requirement and the vibration acceleration level requirement of the vibration damper.
In step S2, the device vibration damping device design requirements are combined with the design rules of the surface wave vibration damping based marine device vibration damping device to design the component parameters of the surface wave vibration damping based marine device vibration damping device.
Further, in one embodiment of the present invention, step S2 specifically includes:
step S201, determining the rigidity requirement of the ship equipment vibration damper based on surface wave vibration damping according to the equipment mass and the momentum characteristic during operation. The rigidity requirements comprise static rigidity requirements and dynamic rigidity requirements, and the rigidity of the device can be enhanced according to the thickness, material selection and the like of each component of the vibration damper.
Step S202, according to the positions of equipment legs and excitation characteristics, the number and arrangement modes of the bearing panel substructures of the ship equipment vibration damper based on surface wave vibration damping are determined.
Specifically, according to the positions of the machine legs of the equipment, the overall size of a pressure-bearing panel in the vibration damping device of the ship equipment based on surface wave vibration damping is primarily determined, the number and arrangement positions of the substructures of the pressure-bearing panel are primarily determined, meanwhile, the number of the machine legs of the equipment is kept at the center position of the substructures of the pressure-bearing panel as much as possible, the vibration response of the structure is smaller as the number of the substructures is larger, but the vibration of the upper layer of the device is aggravated when the panel is disassembled, and the ratio of the number of the recommended panels to the number of the machine legs is 1-2; increasing the thickness of the pressure-bearing panel can reduce the structural response, and can improve the stability of the equipment and the rigidity of the vibration damper at the same time, but the increase of the thickness of the pressure-bearing panel can also increase the weight of the device.
Step S203, determining the coverage range of the liquid sac layers, the number of the liquid sacs, the thickness of the liquid sac layers and the liquid in the liquid sac content of the vibration damper of the ship equipment based on surface wave vibration damping according to the number and arrangement modes of the bearing panel substructures.
Specifically, according to the overall size of the pressure-bearing panel, determining the coverage of the liquid bag layer, wherein the larger the coverage of the liquid bag layer is, the better the vibration isolation effect is, and the contact area of the liquid bag layer at least covers the area surrounded by equipment foot excitation; according to the number of the bearing panel substructures and the arrangement positions thereof, the number of the liquid bags is determined, the increase of the number of the liquid bags in the liquid bag layer can effectively reduce the structural vibration response, and after one large-size liquid bag is replaced by a plurality of small liquid bags according to the excitation positions, the integral vibration isolation level is improved, and meanwhile, the low-frequency vibration isolation effect is relatively weakened; the excitation characteristics of the pattern equipment determine the thickness of the liquid sac layer, the thickness of the liquid sac layer can improve the vibration isolation effect of the device, however, as the thickness of the device increases, the instability of the equipment is increased, and the thickness of the liquid sac layer is not excessively large for equipment with certain stability requirements; according to the fluctuation characteristics of the fluid medium, the content liquid of the liquid sac is determined, the density of the liquid in the liquid sac is reduced, the viscosity coefficient of the liquid power is increased, the vibration response level of the structure can be effectively reduced, and a better vibration isolation effect can be achieved.
Step S204, determining the size and the number of vibration reduction liquid bags of the vibration reduction device of the ship equipment based on surface wave vibration reduction according to the coverage range of the liquid bag layers, the number of the liquid bags, the thickness of the liquid bag layers, the content liquid of the liquid bags and the low-frequency vibration reduction requirement of the preset equipment.
Specifically, the increase of the effective compression area of the vibration reduction liquid bag can effectively increase the rigidity of the vibration reduction liquid bag, the rigidity of the working section of the vibration reduction liquid bag is reduced along with the increase of the filling mass of the porous hydrophobic material, and the performance of the vibration reduction liquid bag can be flexibly adjusted by changing parameters so as to meet the vibration reduction and isolation requirements of different equipment.
Step S205, determining the size of a limit groove of the vibration damper of the ship equipment based on surface wave vibration damping according to the coverage range and the thickness of the liquid bag layer, so as to determine the initial size of each component in the vibration damper of the ship equipment based on surface wave vibration damping.
In step S3, inputting the parameters of each component into a finite element model of the equipment-base-hull structure, taking the vibration acceleration level and the vibration level drop as vibration damping effect evaluation indexes, evaluating whether the vibration damping effect of the ship equipment vibration damping device based on surface wave vibration damping meets the preset equipment vibration damping requirement, and if not, returning to step S2 to redesign the parameters of each component until the design is met.
Further, in one embodiment of the present invention, step S3 specifically includes:
step S301, inputting the parameters of each component into the finite element model of the device-base-hull structure to calculate the vibration acceleration level and the vibration level drop.
And step S302, comparing the vibration acceleration level and the vibration level fall with the equipment vibration reduction index requirement and the vibration reduction device design requirement, and if not, returning to the step S2 to redesign the parameters of each component until the parameters are met.
Specifically, according to the surface wave vibration reduction-based ship equipment vibration reduction device determined in the step S2, building a finite element model of the equipment-vibration reduction device-base-hull structure according to the finite element model of the equipment-base-hull structure in the step S1, and calculating system vibration characteristics, wherein the system vibration characteristics comprise a vibration acceleration level and a vibration level drop;
then, according to the calculated vibration acceleration level and the calculated vibration level drop, comparing the equipment vibration reduction index requirement and the vibration reduction device design requirement of the step S1, and evaluating the vibration reduction effect of the vibration reduction device; the selection of the checking points is consistent with that in the step S103, and the vibration damping effect of the vibration damping device is evaluated by comparing the design requirement of the vibration damping device in the step S104 according to the calculated vibration acceleration level and the calculated vibration level drop;
and finally, returning to the step S2 for redesigning until the vibration reduction requirement is met according to the evaluation result of the vibration reduction effect of the vibration reduction device, and finally obtaining the determined (optimal component parameters) vibration reduction device of the ship equipment based on the surface wave vibration reduction.
In summary, according to the vibration reduction method for the ship equipment based on surface wave vibration reduction provided by the embodiment of the invention, the pressure-bearing panel is discontinuously processed, long waves propagated in the solid are converted into short waves through the hinge, and the conversion from low-frequency vibration to high-frequency vibration is realized; the liquid bag layer converts elastic waves in the solid into surface waves, so that efficient vibration reduction is realized; the vibration damping liquid bag consists of water and a porous hydrophobic material, and water molecules repeatedly enter and exit the porous hydrophobic material under the action of pressure, so that the mutual conversion of mechanical energy and surface energy can be realized, and the energy dissipation is realized; the vibration damper can effectively realize high-efficiency vibration damping of ship equipment, and has the advantages of simple structure, good vibration damping effect, wide application range and the like; the vibration damping method has higher universality, good practicability and wide application field, and is convenient for technical popularization.
In order to achieve the above embodiments, the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the device for damping a ship device based on surface wave damping according to the above embodiments.
In order to achieve the above-described embodiments, the present invention also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a surface wave vibration damping-based marine equipment vibration damping device as described in the previous embodiments.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "N" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer cartridge (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). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A surface wave vibration damping-based marine equipment vibration damping device, comprising: the pressure-bearing panel, the liquid bag layer, the vibration reduction liquid bag, the bottom plate and the limit groove, wherein,
the pressure-bearing panel is arranged above the liquid sac layer, and the top of the pressure-bearing panel is provided with a supporting end face which is directly connected with equipment to be damped;
the liquid sac layer is arranged in the limit groove;
the vibration reduction liquid bag is arranged inside the liquid bag layer;
the bottom plate is arranged below the liquid bag layer and is directly fixedly connected with the ship base panel by bolts;
the limiting groove is of a groove type structure extending upwards from the circumferential position of the bottom plate;
the height of the limiting groove is lower than the thickness of the liquid bag layer, and the limiting groove is not in direct contact with the pressure-bearing panel.
2. The vibration damping device for a surface wave vibration damping-based ship equipment according to claim 1, wherein the pressure-bearing panel comprises a plurality of sub-panels, each sub-panel is connected by a hinge, and long waves are converted into short waves through the hinge.
3. The vibration damping device for a marine installation based on surface wave vibration damping according to claim 1, wherein the liquid bag layer comprises a super-elastic material bag body and a content liquid, the pressure-bearing panel applies a surface force to the liquid bag layer, the elastic wave is transferred to the liquid bag to form a limited water surface wave, the wave energy is concentrated on the liquid surface, and the wave energy is rapidly attenuated as an exponential function along with the increase of the water depth.
4. The vibration damping device for the surface wave vibration damping-based marine equipment according to claim 1, wherein the vibration damping liquid bag is composed of water and a porous hydrophobic material, and water molecules enter and exit the porous hydrophobic material to dissipate vibration energy.
5. The method for damping the ship equipment based on the surface wave damping is characterized by comprising the following steps of:
step S1, establishing a finite element model of an equipment-base-hull structure according to a preset ship mechanical equipment type, and acquiring equipment vibration reduction device design requirements by combining preset ship equipment vibration reduction index requirements;
step S2, combining the design requirement of the equipment vibration damper with the design rule of the ship equipment vibration damper based on surface wave vibration damping to design the parameters of each component of the ship equipment vibration damper based on surface wave vibration damping;
and S3, inputting the parameters of each component into the finite element model of the equipment-base-hull structure, and evaluating whether the vibration damping effect of the ship equipment vibration damping device based on the surface wave vibration damping meets the preset equipment vibration damping requirement by taking the vibration acceleration level and the vibration level drop as vibration damping effect evaluation indexes, and if not, returning to the step S2 to redesign the parameters of each component until the design is met.
6. The method for damping a marine installation based on surface wave damping according to claim 5, wherein the step S1 specifically comprises:
step S101, determining equipment vibration reduction index requirements according to preset ship mechanical equipment types;
step S102, establishing a finite element model of the equipment-base-hull structure according to the equipment, base and hull structure information;
step S103, calculating the vibration characteristics of the system by taking the vibration acceleration level and the vibration level fall as evaluation indexes;
step S104, determining the design requirement of the vibration damper according to the comparison result of the vibration characteristic of the system and the vibration damper index requirement of the equipment.
7. The method for damping a marine installation based on surface wave damping according to claim 5, wherein the step S2 specifically comprises:
step S201, determining the rigidity requirement of the ship equipment vibration reduction device based on surface wave vibration reduction according to the equipment mass and the momentum characteristic during operation;
step S202, determining the number and arrangement modes of the bearing panel substructures of the ship equipment vibration damper based on surface wave vibration damping according to the equipment machine leg positions and the excitation characteristics;
step S203, determining the coverage range, the number, the thickness and the content liquid of liquid bags of the liquid bag layer of the vibration damping device of the ship equipment based on surface wave vibration damping according to the number and the arrangement mode of the bearing panel substructures;
step S204, determining the size and the number of vibration reduction liquid bags of the vibration reduction device of the ship equipment based on surface wave vibration reduction according to the coverage range of the liquid bag layers, the number of the liquid bags, the thickness of the liquid bag layers, the liquid content of the liquid bags and the low-frequency vibration reduction requirement of preset equipment;
step S205, determining the size of a limit groove of the vibration damper of the ship equipment based on surface wave vibration damping according to the coverage range and the thickness of the liquid sac layer.
8. The method for damping a surface wave damping-based marine vessel equipment according to claim 5, wherein the step S3 specifically comprises:
step S301, inputting the parameters of each component into the finite element model of the equipment-base-hull structure so as to establish the finite element model of the equipment-vibration damper-base-hull structure, and calculating the vibration acceleration level and the vibration level drop;
and step S302, comparing the vibration acceleration level and the vibration level drop with the equipment vibration reduction index requirement and the vibration reduction device design requirement, and returning to the step S2 to redesign the parameters of each component if the vibration acceleration level and the vibration level drop are not met until the design is met.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of damping marine device based on surface wave damping according to any one of claims 5-8 when the computer program is executed.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements a method of damping a marine device based on surface wave damping according to any of claims 5-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310198203.5A CN116221320A (en) | 2023-03-01 | 2023-03-01 | Ship equipment vibration reduction device and method based on surface wave vibration reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310198203.5A CN116221320A (en) | 2023-03-01 | 2023-03-01 | Ship equipment vibration reduction device and method based on surface wave vibration reduction |
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| CN116221320A true CN116221320A (en) | 2023-06-06 |
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| CN202310198203.5A Pending CN116221320A (en) | 2023-03-01 | 2023-03-01 | Ship equipment vibration reduction device and method based on surface wave vibration reduction |
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| CN (1) | CN116221320A (en) |
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