Icebreaking impact vibration noise load simplification method and device, electronic equipment and storage medium

Abstract

The invention provides an icebreaking impact vibration noise load simplification method and device, electronic equipment and a storage medium, and belongs to the field of icebreaking impact vibration noise prediction. The problem that the ice breaking impact vibration noise calculation efficiency is low due to huge ice load data magnitude is solved. The invention discloses an icebreaking impact vibration noise load simplification method. The method comprises the following steps: acquiring ice-induced impact load data and then cleaning the data; the surface of the ship body is divided into a plurality of stations, and each station serves as a processing unit; performing time statistics and average processing on the cleaned ice-induced impact load data in each processing unit to obtain average processing data; selecting a proper model to process the average processing data in each processing unit to obtain a frequency domain curve; and comparing each frequency domain curve with a simulation calculation result curve, and verifying the effectiveness of a frequency domain curve simplification result. The method is mainly used for simplifying icebreaking data.

Description

Technical Field

[0001] The present invention belongs to the field of prediction of ice-breaking impact vibration and noise, and particularly relates to a method, device, electronic device and storage medium for simplifying ice-breaking impact vibration and noise loads. Background Art

[0002] Ships sailing in polar regions will encounter the impact of sea ice, generating ice-induced impact loads. The impact of these loads on the ship structure is significant, which may lead to structural fatigue damage and even structural failure in extreme cases. Therefore, accurately evaluating the impact of ice loads on the ship structure is the key to ensuring the safety and reliability of the ship. However, the complexity and dynamic changes of ice loads make it difficult for traditional analysis methods to provide sufficient accuracy and reliability.

[0003] Ice load data has obvious spatio-temporal randomness, and its magnitude and distribution change with time and space. This randomness increases the complexity of load analysis, making traditional analysis methods based on experience and static data unable to fully capture the dynamic characteristics of ice loads. In addition, ice load data usually contains a large amount of time-domain signals, and effective data processing techniques are required to extract key features for further analysis and application.

[0004] The ice load calculation of icebreakers uses LS-DYNA software, and the vibration and noise analysis software uses finite elements. The requirements for the number and quality of grids are different for the two, which makes it difficult to achieve complete consistency in grid division. When they are inconsistent, it is very difficult to directly import the calculation results of one software into another software as the input for ice-breaking vibration and noise numerical simulation.

[0005] To address the above challenges, a load simplification method needs to be developed. This method can process and simplify complex ice load data, making it easier to analyze and apply, and solving the data calling problem between the two software. The goal of this method is to provide a systematic way to extract the key features of ice loads, reduce the randomness of data, and convert it into a format that can be used for ship design and structural analysis. Through this method, the accuracy of ice load analysis can be improved, the ship structure design can be optimized, and thus the safety and economy of the ship in polar ice regions can be enhanced. Summary of the Invention

[0006] In view of this, the present invention aims to propose a method, device, electronic device and storage medium for simplifying ice-breaking impact vibration and noise loads, so as to solve the problem of low calculation efficiency of ice-breaking impact vibration and noise caused by the huge magnitude of ice load data.

[0007] To achieve the above object, the present invention adopts the following technical solutions. According to the first aspect of the present invention, a method for simplifying ice-breaking impact vibration and noise loads is provided, including the following steps:

[0008] After obtaining the icebreaking impact load data, clean the data;

[0009] Divide the hull surface into multiple stations, each station as a processing unit;

[0010] Perform time statistics on the ice-breaking impact load data after cleaning in each processing unit, and average the data to obtain average processing data;

[0011] Select a suitable model to process the average processed data in each processing unit to obtain a frequency domain curve;

[0012] Compare each frequency domain curve with the simulation calculation result curve to verify the validity of the simplified results of the frequency domain curve.

[0013] Furthermore, the cleaning method is: to remove the data whose maximum value in the acquired icebreaking impact load data is less than a certain proportion of the average maximum load value of the impact load data and / or the data whose zero load item is greater than a set threshold.

[0014] Furthermore, the certain proportion is 10%.

[0015] Furthermore, the station division method is: a station is set at a certain distance in the X-axis direction.

[0016] Furthermore, the certain distance is 5m or 10m.

[0017] Furthermore, the method of selecting the appropriate model is: performing short-time Fourier transform and fast Fourier transform on the average processed data respectively, and selecting the appropriate model after comparing the two transformation curves.

[0018] Furthermore, the validity of the frequency domain curve simplification results is verified by taking three position nodes at the bow, midship and stern, and comparing the icebreaking impact load data curves before simplification of the three nodes with the frequency domain curves after simplification.

[0019] According to a second aspect of the present invention, there is provided an icebreaking impact vibration noise load simplification device, comprising:

[0020] Screening module, used to clean the data after obtaining the ice breaking impact load data;

[0021] A substation processing module, used for dividing the hull surface into multiple stations, each station as a processing unit;

[0022] An average processing module is used to perform time-based statistical average processing on the ice-breaking impact load data after cleaning in each processing unit to obtain average processing data;

[0023] A frequency-domain curve acquisition module, configured to select a suitable model to process the average processed data in each processing unit to obtain a frequency-domain curve;

[0024] A verification module, configured to compare each frequency-domain curve with a simulation calculation result curve to verify the effectiveness of the frequency-domain curve simplification result.

[0025] According to a third aspect of the present invention, there is provided an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the method as described above.

[0026] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium, on which a computer program is stored, and the computer program is used to cause the computer to execute the method as described above.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. Through the screening and elimination steps, outliers and noise are removed, the amount of data for subsequent processing is reduced, and the efficiency of data processing is improved.

[0029] 2. The sub-station processing and statistical averaging steps make the load data in each area more representative, can more accurately reflect the actual load situation, and at the same time, through the averaging of data, the data output by LS-DYNA can be used by finite element software.

[0030] 3. The fast Fourier transform step provides accurate frequency-domain analysis, reveals the main frequency components of the load signal, and helps to identify key dynamic characteristics.

[0031] 4. The verification step ensures the effectiveness of the simplified model, and verifies the accuracy and reliability of the simplification method through comparison with the simulation calculation results.

[0032] 5. The simplification method can adapt to different working conditions, and provides a general processing framework for ice load analysis under different ship speeds and ice thicknesses.

[0033] 6. A simplified load data representation is provided, which is convenient for application in ship design and structural analysis, helps to optimize the ship structure to resist the influence of ice load. By reducing the demand for complex computing resources, this method helps to reduce the computing cost of ship design and reduce the risk of structural failure caused by inaccurate load estimation. The simplified load data processing method can be integrated into the automated design process to improve the intelligent level of the design process and speed up the design and analysis. At the same time, the simplified load data provided by this method can be used as a decision support tool to help engineers and designers make more scientific and reasonable decisions in ship design and operation. Description of the Drawings

[0034] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0035] Figure 1 It is a flowchart of a method for simplifying ice-breaking impact vibration and noise loads according to the present invention;

[0036] Figure 2 It is a block schematic diagram of a device for simplifying ice-breaking impact vibration and noise loads according to the present invention;

[0037] Figure 3 It is a structural schematic diagram of an electronic device according to the present invention;

[0038] Figure 4 It is a distribution schematic diagram of the division stations according to the present invention;

[0039] Figure 5 It is the frequency domain curve of the average ice load at the first station according to the present invention;

[0040] Figure 6 It is the frequency domain curve of the average ice load at the second station according to the present invention;

[0041] Figure 7 It is the frequency domain curve of the average ice load at the third station according to the present invention;

[0042] Figure 8 It is the frequency domain curve of the average ice load at the fourth station according to the present invention;

[0043] Figure 9 It is the frequency domain curve of the average ice load at the fifth station according to the present invention;

[0044] Figure 10 It is a comparison curve graph of the bow node before and after simplification according to the present invention;

[0045] Figure 11 It is a comparison curve graph of the midship node before and after simplification according to the present invention;

[0046] Figure 12 It is a comparison curve graph of the stern node before and after simplification according to the present invention;

[0047] Figure 13 It is a finite element model for ice-breaking according to the present invention;

[0048] Figure 14 It is an icebreaker model;

[0049] Figure 15 It is a finite element model of the fluid domain. Detailed implementation manners

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0051] The following describes an icebreaking impact vibration noise load simplification method, device, electronic device and storage medium according to an embodiment of the present invention with reference to the accompanying drawings. In view of the problem that the ice breaking impact vibration noise calculation efficiency is low due to the huge magnitude of ice load data mentioned in the background technology center, the present invention provides an icebreaking impact vibration noise load simplification method. In this method, by reasonably cleaning the data and reasonably dividing the hull into stations, the data in each station is averaged and then fast Fourier transformed to obtain a frequency domain curve and a simulation structure, and a basically similar curve is obtained, which proves that the simplification is effective and can reduce the amount of statistical calculation of the data. In this way, the problem of low calculation efficiency due to the huge magnitude of ice load data is solved.

[0052] Specifically, Figure 1 A schematic flow chart of a method for simplifying icebreaking impact vibration noise loads provided in an embodiment of the present invention.

[0053] like Figure 1 As shown, the ice-breaking impact vibration noise load simplification method includes the following steps:

[0054] In step S101, the ice-breaking impact load data is obtained and then cleaned; the ice-breaking impact load data obtained is output by the LS-DYNA software. The purpose of cleaning is to remove the ice-induced loads with less influence, and take the statistical average of the ice loads in the area with consistent frequency domain change trends of the ice-induced loads to study their regional change laws. Based on this cleaning idea, the impact loads with spatiotemporal randomness characteristics are reasonably simplified, the loads are preliminarily screened, and the threshold is set. The loads with a maximum value less than the threshold or a load zero item greater than the threshold are removed. The threshold is 10% of the average value of all load maximum values ​​and the average number of non-zero items of all loads. The threshold setting method is reasonably set according to the requirements.

[0055] Among them, the method of obtaining icebreaking impact load data is to establish a flat ice finite element model based on the elastic fracture failure model with plastic strain failure criterion, and use the LS-Dyna fluid-solid coupling method to carry out numerical simulation of the ice load of the icebreaker model under continuous icebreaking and collision icebreaking to obtain data.

[0056] Specifically, the structure of the icebreaker model is as follows: Figure 14As shown in the figure, the hull material is selected as a rigid body with an elastic modulus of 2.06×1011 N / m2 and a Poisson's ratio of 0.3. The hull is automatically divided into 2D grids, with the basic unit grid being approximately 0.4 m and the number of grids being 29,078. The finite element model for icebreaking is as shown in Figure 13 As shown in the figure, all the nodes of the hull move at a constant speed in the x direction. To ensure that the finite element model of the hull is consistent with the actual hull displacement during the icebreaking process, mass points are evenly distributed on the finite element model of the hull to ensure that the momentum of the finite element model of the hull is consistent with the actual hull momentum; the ice length is approximately twice the length between perpendiculars, the width is approximately five times the ship width, and the initial distance between the flat ice and the water surface is 0.01 m. The finite element model of the fluid domain is as shown in Figure 15 As shown in the figure, the length and width of the water area and the air area are 240 m and 120 m respectively, the water depth of the water area is 16 m, and the height of the air area is 8 m. To reasonably reduce the number of grids, the air elements are meshed with variable pitch. The grids gradually increase from the free surface in the z direction towards both ends, which can effectively improve the ALE calculation efficiency. The outer boundaries of the flow field (i.e., the other boundary surfaces except the water-air interface and the bottom of the water area) all adopt non-reflecting boundary conditions (*BOUNDARY_NON_REFLECTING) to prevent reflection problems caused by artificial boundary settings and achieve the simulation effect of a boundaryless flow field. The non-reflecting boundary condition is set at the top of the air area to avoid reverse flow after the fluid splashes to the top, and the z-direction degrees of freedom of the nodes at the bottom of the water area are constrained. When modeling, the two are treated as coplanar, and the two materials share the same nodes during meshing. Both water and air adopt the Null material model.

[0057] The water material adopts the GRUNISEN equation of state:

[0058]

[0059] where p is the medium pressure, ρ 0 is the density of the medium in front of the wavefront, μ = ρ / ρ 0 -1, c is the shock wave speed (1647 m / s), γ 0 is the GRUNISEN constant (taken as), b is the first-order volume correction of γ 0 (taken as), S 1 , S 2 and S 3 are the coefficients of the equation of state (taking S 1 = 1.92, S 2 = -0.096, respectively).

[0060] The air material model adopts the linear polynomial equation of state (LINEAR_POLYNOMIAL), that is:

[0061] p = c 0 + c 1 μ + c2 μ 2 +c 3 μ 3 +(c 4 +c 5 μ + c 6 μ 2 )E(2)

[0062] Among them, c 0 ~c 6 are the coefficients of the linear polynomial state equation. In this paper, c 0 = c 1 = c 2 = c 3 = c 6 = 0, c 4 = c 5 = 0.4, E = 2.5×10 5

[0063] The material parameters of the fluid model are shown in Table 1.

[0064] Table 1 Material parameters of the fluid model

[0065]

[0066] To analyze the regular characteristics of the continuous ice-breaking ice-induced load, the research on the continuous ice-breaking impact load is carried out under the conditions of a ship speed of 3 kn and a flat ice thickness of 1 m. The working conditions of the icebreaker model for ramming ice-breaking are shown in Table 2.

[0067] Table 2 Working condition table

[0068]

[0069]

[0070] In the range of 0 - 100 Hz, before and after simplification, the total level error of the vibration response in the stern area of the ship is less than 2.4 dB, the total level error of the vibration response in the midship area of the ship is less than 2.5 dB, and the total level error of the vibration response in the bow area of the ship is less than 2.2 dB. Moreover, before and after simplification, the changing trends of the vibration responses in the stern, midship, and bow of the ship are basically the same, and the load simplification method is effective.

[0071] When the sea ice interacts with the icebreaker model, there are mainly the following three failure modes:

[0072] (1) Extrusion failure: The ice layer in the affected area is gradually broken due to extrusion;

[0073] (2) Shear failure: Cracks generated when the shear stress on the ice layer reaches the strength limit;

[0074] (3) Bending failure: The ice layer moves along the inclined plane structure and then is bent and finally undergoes bending failure.

[0075] Different ice-breaking modes will cause changes in the loads on the icebreaker model. Generally speaking, the ice-breaking mode, the ice crack growth process, the shedding of broken ice, and the phenomena such as the sliding and clearing of broken ice can relatively realistically reflect the ice-breaking process of the icebreaker model in a flat ice environment, thus verifying the rationality of this method from the side.

[0076] Therefore, in order to analyze the vibration characteristics of the icebreaker model under ice-induced loads, the nodal forces on the hull surface are output based on the LS-Dyna software, so as to obtain the spatio-temporal distribution of the loads on the icebreaker model, as Figure 4 shown, where yellow represents the action of impact loads on the hull surface positions. From the numerical results, the stress area of the icebreaker model during the ice-breaking process is mainly concentrated near the waterline, that is, the ice-loaded area of the icebreaker model. Therefore, the sub-stations are based on the ice-loaded area. Through the above processing process, the load data of the icebreaker can be obtained, and the data is simplified and distinguished in the above way, providing a basis for the sub-station steps. Since the LS-Dyna software is used for the calculation of the ice loads of the icebreaker, and the finite element method is used for the vibration and noise analysis software, the requirements for the number and quality of the meshes are different for the two, which makes it difficult to ensure that the meshes are exactly the same. When they are inconsistent, it is very difficult to directly import the calculation results of one software into another software as the input for the numerical simulation of ice-breaking vibration and noise. Therefore, a method of sub-station average loading is proposed to deal with this. The sub-stations are to further improve the accuracy, because the average of the whole ship will result in too small loads after averaging for each point. By setting a threshold, for example, first perform data screening, first extract the loads of the whole ship and calculate the average value. When the loads of each point are more than one order of magnitude less than the average value, all are ignored. Then, from the bow to the stern, according to the load size difference, multiple stations are divided to achieve fast loading and efficient calculation of the excitation.

[0077] In step S102, the hull surface is divided into multiple stations, and each station is used as a processing unit. The way of station division is: taking the X-axis as the direction, a certain distance is set as one station at intervals, and the certain distance is 5m or 10m. In this application, the zoning method is as Figure 4 described. Specifically, within the area from the parallel mid-body of the hull to 105m away from the tail end, the similarity of the frequency-domain change curves is relatively high. Taking 10m as one station, this area is divided, and a total of two stations are divided: 95m - 105m, 85m - 95m; from 100m away from the stern to the most forward position of the ship, the ice load acts more violently. Taking 5m as one station, a total of three stations are divided: 105m - 110m, 110m - 115m, and 115m - 120m. For the Y-axis and Z-axis, the change rules are the same, and no specific analysis is made.

[0078] In step S103, the statistically averaged processing in time is performed on the cleaned ice-breaking impact load data in each processing unit to obtain the averaged processed data; this is used to obtain representative data for this area.

[0079] In step S104, a suitable model is selected to process the averaged processed data in each processing unit to obtain the frequency-domain curve. Here, short-time Fourier processing is first performed, and then fast Fourier transform is carried out. Short-time Fourier analysis is one of the important analysis methods for analyzing collision problems. The short-time Fourier transform (STFT) is a mathematical transform related to the Fourier transform. Its idea is: select a time-frequency localized window function, assume that the analysis window function g(t) is stationary (pseudo-stationary) within a short time interval, move the window function so that the signal is a stationary signal within different finite time widths, and thus calculate the amplitude-frequency curves at different times. The short-time Fourier transform uses a fixed window function. Once the window function is determined, its shape no longer changes, and the resolution of the short-time Fourier transform is also determined.

[0080] The mathematical expression of the short-time Fourier transform is:

[0081]

[0082] X(t,f) is the result of the STFT, representing the complex value at time t and frequency f. It is a complex function, usually containing amplitude and phase information.

[0083] x(τ) is the original signal, where τ is a variable representing the time point in the signal.

[0084] w(τ - t) is the window function, which is a localization function used to limit the signal within a small time interval.

[0085] The window function is usually centered at time t, so the parameter of the window function is τ - t. The window function can be a rectangular window, a Hamming window, a Hanning window, etc.

[0086] e -j2πfτ is the complex exponential function used to transform the signal from the time domain to the frequency domain. Here, j is the imaginary unit, satisfying j 2 = -1, and 2πfτ is the phase factor, which is related to the frequency f and time τ.

[0087] is the integral symbol, indicating integration over the entire real line. In the STFT, this means integrating over the entire signal.

[0088] dτ is the differential element of the integral, indicating that the integration is with respect to the variable τ.

[0089] The expression of the fast Fourier transform is:

[0090]

[0091] X[k] is the complex representation of the k-th frequency component of the sequence x[n].

[0092] x[n] is a discrete signal sequence in the time domain, where n is the index of the sequence, ranging from 0 to N - 1.

[0093] N is the length of the sequence x[n].

[0094] k is the frequency index, also ranging from 0 to N - 1.

[0095] j is the imaginary unit, satisfying j 2 = -1.

[0096] The processing methods of the short-time Fourier transform (STFT) and the fast Fourier transform for data, substituting the corresponding data according to the parameters in the formula to obtain the corresponding curves, are prior arts and will not be elaborated here.

[0097] To analyze whether the law between the local time and the overall is consistent, the fast Fourier transform and the short-time Fourier transform are respectively performed on the ice-breaking impact loads of each station and compared. The fast Fourier transform method and the short-time Fourier method are respectively used to process and compare the ice-breaking impact loads statistically averaged in the x direction in the region. The short-time Fourier transform uses a hann window with a window length of 2s. After research, as Figures 5 - 11 shown, the amplitude-frequency characteristics of the fast Fourier transform of the average ice load in the region are basically consistent with those of the short-time Fourier transform, and the amplitude-frequency characteristics curve law of the fast Fourier transform of a single point. In this application, considering the amplitude-frequency characteristics of the ice load and the subsequent vibration calculation and loading, the fast Fourier transform is finally used to perform an overall analysis and processing on the ice load.

[0098] In step S105, each frequency-domain curve is compared with the simulation calculation result curve to verify the effectiveness of the frequency-domain curve simplification result. The method for verifying the effectiveness of the frequency-domain curve simplification result is: taking the node positions at the bow, midship, and stern of the ship, and comparing the ice-breaking impact load data curves before simplification of the three nodes with the frequency-domain curve after simplification.

[0099] To verify the effectiveness of the load simplified by averaging by sub-station, a structural vibration response simulation analysis is carried out. The loads before and after simplification are respectively loaded, and the vibration responses of the two working conditions are compared. The node positions at the bow, midship, and stern of the ship are taken for comparison. The coordinates of the comparison points are shown in Table 3. The vibration responses before and after simplification of each comparison point are as Figures 10 - 12 shown.

[0100] Table 3 Coordinate Table of Comparison Points

[0101] Serial number x / m y / m z / m Comparison point 1 0m 0m 11.8m Comparison point 2 50.4m 0m 11.8m Comparison point 3 121.3m 0m 17.6m

[0102] According to Figures 10 - 12 the curve, it can be seen that the coincidence degree of the vibration response curves before and after simplification is relatively high. Therefore, it is considered that the data after simplification is valid and can basically reflect the real data. Therefore, the data after simplification by this simplification method is available and can reduce the data magnitude while reducing the calculation magnitude.

[0103] Other cases with two software data calls having the technical problems described in this application can also use this method for simplification, and other methods including the idea of this method are also within the spirit of this invention.

[0104] Secondly, refer to the appendix Figure 2 Describe an ice-breaking impact vibration noise load simplification device according to an embodiment of the present invention.

[0105] Figure 2 It is a block diagram of an ice-breaking impact vibration noise load simplification device according to an embodiment of the present invention.

[0106] As Figure 2 shown, the ice-breaking impact vibration noise load simplification device includes:

[0107] A screening module, configured to clean the data after obtaining the ice-breaking impact load data;

[0108] A sub-station processing module, configured to divide the hull surface into multiple stations, and each station serves as a processing unit;

[0109] An average processing module, configured to perform statistical averaging processing on the cleaned ice-breaking impact load data within each processing unit in terms of time to obtain average processing data;

[0110] A frequency-domain curve acquisition module, configured to select a suitable model to process the average processing data within each processing unit to obtain a frequency-domain curve;

[0111] A verification module, configured to compare each frequency-domain curve with the simulation calculation result curve to verify the effectiveness of the frequency-domain curve simplification result.

[0112] It should be noted that the foregoing explanation of the embodiment of an ice-breaking impact vibration noise load simplification method is also applicable to an ice-breaking impact vibration noise load simplification device in this embodiment, and will not be elaborated here.

[0113] Figure 3 It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. The electronic device may include:

[0114] A memory 401, a processor 402, and a computer program stored on the memory 401 and executable on the processor 402.

[0115] When the processor 402 executes a program, it implements a method for simplifying ice-breaking impact vibration noise loads provided in the above embodiments.

[0116] Furthermore, the electronic device further includes:

[0117] A communication interface 403, used for communication between the memory 401 and the processor 402.

[0118] A memory 401, used for storing computer programs that can run on the processor 402.

[0119] The memory 401 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.

[0120] If the memory 401, the processor 402, and the communication interface 403 are implemented independently, the communication interface 403, the memory 401, and the processor 402 can be interconnected through a bus and complete communication with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of representation, Figure 12 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus or one type of bus.

[0121] Optionally, in specific implementation, if the memory 401, the processor 402, and the communication interface 403 are integrated on a chip, the memory 401, the processor 402, and the communication interface 403 can complete communication with each other through an internal interface.

[0122] The processor 402 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0123] The embodiments of the present invention also provide a computer program product, and when the computer program / instructions are executed by a processor, they implement a method for simplifying ice-breaking impact vibration noise loads as described above.

[0124] An embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements a method for simplifying ice-breaking impact vibration noise load as described above.

[0125] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", 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 a suitable manner in any one or N embodiments or examples. 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.

[0126] 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 clearly and specifically defined.

[0127] Any process or method description in a flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or N executable instructions for implementing a customized logical function or process, and 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 a 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 of the embodiments of the present invention.

[0128] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definable list of executable instructions for implementing logical functions, and can be specifically implemented 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, apparatuses, 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 (non-exhaustive list) of computer-readable media include the following: an electrical connection part (electronic device) having one or N wirings, a portable computer disk 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). 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 by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0129] It should be understood that 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. 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 suitable combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0130] 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 embodiments can be completed by instructing relevant hardware through a program, 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.

[0131] In addition, each functional unit in various embodiments of the present invention may be integrated into one 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.

[0132] The above-mentioned storage medium may be a read-only memory, a magnetic disk or 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 method for simplifying ice-breaking impact vibration and noise loads, characterized in that: The following steps are involved: After obtaining the ice-induced impact load data, clean the data; Divide the hull surface into multiple stations, each station as a processing unit; Perform time statistics on the ice-breaking impact load data after cleaning in each processing unit, and average the data to obtain average processing data; Select a suitable model to process the average processed data in each processing unit to obtain a frequency domain curve; Compare each frequency domain curve with the simulation calculation result curve to verify the validity of the simplified results of the frequency domain curve.

2. The ice breaking impact vibration noise load simplification method according to claim 1, characterized in that: The cleaning method is to remove data whose maximum value in the acquired ice-induced impact load data is less than a certain proportion of the average maximum load value of the impact load data and / or data whose zero load item is greater than a set threshold.

3. The icebreaking impact vibration noise load simplification method according to claim 2, characterized in that: The certain proportion is 10%.

4. A method for simplifying icebreaking impact vibration noise load according to claim 1, 2 or 3, characterized in that: The station division method is: a station is set at a certain distance in the X-axis direction.

5. The ice-breaking impact vibration noise load simplification method according to claim 4, characterized in that: The certain distance is 5m or 10m.

6. A method for simplifying icebreaking impact vibration noise load according to claim 1, 2, 3 or 5, characterized in that: The method of selecting the appropriate model is: performing short-time Fourier transform and fast Fourier transform on the average processed data respectively, and selecting the appropriate model after comparing the two transformation curves.

7. The icebreaking impact vibration noise load simplification method according to claim 6 is characterized in that: The method to verify the validity of the simplified frequency domain curve is as follows: take the three position nodes of the bow, midship and stern, and compare the icebreaking impact load data curves before simplification of the three nodes with the simplified frequency domain curves.

8. An ice-breaking impact vibration noise load simplification device, characterized in that: include: Screening module, used to clean the data after obtaining the ice breaking impact load data; A substation processing module, used for dividing the hull surface into multiple stations, each station as a processing unit; An average processing module is used to perform time-based statistical average processing on the ice-breaking impact load data after cleaning in each processing unit to obtain average processing data; A frequency domain curve acquisition module is used to select a suitable model to process the average processed data in each processing unit to obtain a frequency domain curve; The verification module is used to compare each frequency domain curve with the simulation calculation result curve to verify the validity of the simplified result of the frequency domain curve.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method according to claim 1, 2, 3, 5 or 7.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, the computer program being used to cause the computer to execute the method according to claim 1, 2, 3, 5 or 7.

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