Method, system and equipment for calculating transmission loss of liquid filling pipeline under acoustic-solid coupling condition, medium and product

Abstract

The invention discloses a liquid filling pipeline transmission loss calculation method, system and device under the sound-solid coupling condition, a medium and a product, and relates to the technical field of pipeline noise control, and the method comprises the steps: constructing a liquid filling pipeline transmission loss calculation model of a target liquid filling pipeline under the sound-solid coupling condition, boundary conditions and excitation are applied to the liquid filling pipeline transmission loss calculation model, waveguide analysis working conditions are constructed, and vibration-sound response is calculated based on the waveguide analysis working conditions; determining vibration-sound coupling wave characteristics of the liquid-filled pipeline based on the liquid-filled pipeline transmission loss calculation model; on the basis of the vibration-sound response and the vibration-sound coupling wave characteristics, pipeline propagation wave information in the target liquid filling pipeline is obtained; and calculating the transmission loss of the target liquid-filled pipeline under the acoustic-solid coupling condition by utilizing a perfect matching layer technology based on the liquid-filled pipeline transmission loss calculation model and the pipeline propagation wave information. According to the method, the accuracy and effectiveness of calculation of the transmission loss of the liquid filling pipeline under the acoustic-solid coupling condition are improved.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline noise control, and particularly to a method, system, device, medium and product for calculating the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure interaction. Background Art

[0002] Liquid-filled pipelines are common in building, chemical and ship pipeline systems, and their noise control is an important research content. Among them, the transmission loss is an important index in pipeline noise research. According to the transmission loss, the acoustic characteristics of pipeline structures, equipment, etc. can be effectively evaluated. Therefore, the transmission loss is often used as the design basis for the pipeline noise control effect.

[0003] Many books and literatures in the field of classical hard-wall pipeline acoustics involve the calculation method of transmission loss under hard-wall conditions. This method is based on the plane wave theory under hard-wall conditions and is the most commonly used method in current research. The application object of the above transmission loss calculation method is a general pipeline unit, and it does not focus on a specific form of pipeline unit. At present, there are many studies describing the calculation method of transmission loss for a specific form of pipeline unit. The purpose of these studies is to quickly and accurately predict the transmission loss under the specific form of pipeline unit, and the overall framework of the transmission loss calculation remains unchanged and still belongs to the category of the above calculation method.

[0004] It can be seen that the basic principle of the existing pipeline transmission loss calculation method is the plane wave theory under hard-wall conditions. However, in general liquid-filled pipelines, due to the close proximity of the pipe wall structure and the material properties of the fluid inside the pipe, the acoustic-structure interaction characteristics of the two cannot be ignored. Therefore, in a liquid-filled pipeline under the condition of acoustic-structure interaction, the plane wave theory often no longer applies, making the existing transmission loss calculation method ineffective.

[0005] Therefore, it is necessary to provide a method for calculating the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure interaction to solve the above problems. Summary of the Invention

[0006] The purpose of the present application is to provide a method, system, device, medium and product for calculating the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure interaction, which improves the accuracy and effectiveness of calculating the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure interaction.

[0007] To achieve the above purpose, the present application provides the following solutions:

[0008] In a first aspect, the present application provides a method for calculating the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure interaction, where the method for calculating the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure interaction includes:

[0009] Construct a calculation model for the transmission loss of a liquid-filled pipeline under the condition of acoustic-solid coupling; the calculation model for the transmission loss of the liquid-filled pipeline includes: an intermediate unit, an inlet pipe, and an outlet pipe;

[0010] Apply corresponding boundary conditions and excitations to the calculation model for the transmission loss of the liquid-filled pipeline, construct a waveguide analysis condition, and calculate the vibro-acoustic response of the waveguide analysis condition based on the waveguide analysis condition;

[0011] Based on the calculation model for the transmission loss of the liquid-filled pipeline, determine the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-solid coupling; the vibro-acoustic coupling wave characteristics include: the vibro-acoustic coupling wave number and the vibro-acoustic coupling wave mode;

[0012] Based on the vibro-acoustic response of the waveguide analysis condition and the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline, analyze the vibro-acoustic response based on the vibro-acoustic coupling wave of the liquid-filled pipeline to obtain the pipeline propagation wave information in the target liquid-filled pipeline; the pipeline propagation wave information includes: the number of types of pipeline propagation waves, the types of pipeline propagation waves, and the amplitudes of pipeline propagation waves;

[0013] Using the perfectly matched layer technique, calculate the transmission loss of the target liquid-filled pipeline under the condition of acoustic-solid coupling based on the calculation model for the transmission loss of the liquid-filled pipeline and the pipeline propagation wave information.

[0014] Optionally, applying corresponding boundary conditions and excitations to the calculation model for the transmission loss of the liquid-filled pipeline to construct a waveguide analysis condition specifically includes:

[0015] Respectively determine the fluid region surfaces and structural region surfaces corresponding to the inlet pipe and the outlet pipe; the fluid region surfaces include: an inlet fluid surface and an outlet fluid surface; the structural region surfaces include: an inlet structural surface and an outlet structural surface;

[0016] Set the boundary conditions of the structural region surfaces to be fixed and set the boundary conditions of the fluid region surfaces to be acoustically transparent;

[0017] Set the excitation of the calculation model for the transmission loss of the liquid-filled pipeline to be the sound wave vertically incident on the calculation model for the transmission loss of the liquid-filled pipeline on the inlet fluid surface, thereby constructing the corresponding waveguide analysis condition.

[0018] Optionally, calculating the vibro-acoustic response of the waveguide analysis condition based on the waveguide analysis condition specifically includes:

[0019] Construct the control equation of the waveguide analysis condition;

[0020] Solve the control equation of the waveguide analysis condition to obtain the vibration state values or noise state values of each point in the calculation model for the transmission loss of the liquid-filled pipeline, and use the vibration state values or noise state values of each point as the vibro-acoustic response of the waveguide analysis condition.

[0021] Optionally, based on the calculation model of the transfer loss of the liquid-filled pipeline, determine the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-structure coupling, specifically including:

[0022] Determine the liquid-solid wave equation and boundary conditions corresponding to the pipeline cross-section on the target liquid-filled pipeline;

[0023] Based on the liquid-solid wave equation and boundary conditions corresponding to the pipeline cross-section, construct a calculation model for the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-structure coupling;

[0024] Solve the calculation model for the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-structure coupling, and determine the vibration-acoustic coupling wave number and vibration-acoustic coupling wave mode of the liquid-filled pipeline under the condition of acoustic-structure coupling.

[0025] Optionally, based on the vibration-acoustic response of the waveguide analysis condition and the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline, analyze the vibration-acoustic response based on the vibration-acoustic coupling wave of the liquid-filled pipeline to obtain the pipeline propagation wave information in the target liquid-filled pipeline, specifically including:

[0026] Fit any state quantity of the pipeline cross-sections of the inlet pipe and the outlet pipe in the vibration-acoustic response of the waveguide analysis condition to obtain the corresponding state quantity fitting values respectively;

[0027] Construct an objective function based on the state quantity and the corresponding state quantity fitting value;

[0028] Iteratively solve the objective function to determine the pipeline propagation wave information in the target liquid-filled pipeline in the vibration-acoustic response.

[0029] Optionally, using the perfectly matched layer technique, based on the calculation model of the transfer loss of the liquid-filled pipeline and the pipeline propagation wave information, calculate the transfer loss of the target liquid-filled pipeline under the condition of acoustic-structure coupling, specifically including:

[0030] Obtain multiple calculation models of the transfer loss of the liquid-filled pipeline;

[0031] Stretch the boundary surfaces of the inlet pipe and the outlet pipe of each calculation model of the transfer loss of the liquid-filled pipeline outward to form corresponding thin layers, and set each of the thin layers as a perfectly matched layer; the boundary surfaces include: the structural region surface and the fluid region surface;

[0032] Using the perfectly matched layers corresponding to different thin layers, construct multiple transfer loss calculation conditions;

[0033] Calculate the pipeline propagation wave amplitude of the corresponding inlet pipe and the pipeline propagation wave amplitude of the outlet pipe in different transfer loss calculation conditions;

[0034] Based on the pipeline propagation wave amplitudes of the corresponding inlet pipe and the pipeline propagation wave amplitudes of the outlet pipe in different transfer loss calculation conditions, determine the transfer loss of the target liquid-filled pipeline under the condition of acoustic-solid coupling.

[0035] In a second aspect, the present application provides a system for calculating the transfer loss of a liquid-filled pipeline under the condition of acoustic-solid coupling. The system for calculating the transfer loss of a liquid-filled pipeline under the condition of acoustic-solid coupling is used to implement the method for calculating the transfer loss of a liquid-filled pipeline under the condition of acoustic-solid coupling. The system for calculating the transfer loss of a liquid-filled pipeline under the condition of acoustic-solid coupling includes:

[0036] A model construction unit, configured to construct a calculation model for the transfer loss of a liquid-filled pipeline under the condition of acoustic-solid coupling of the target liquid-filled pipeline; the liquid-filled pipeline includes: an intermediate unit, an inlet pipe, and an outlet pipe;

[0037] A waveguide analysis condition and vibration-acoustic response determination unit, configured to apply corresponding boundary conditions and excitations to the calculation model for the transfer loss of the liquid-filled pipeline, construct a waveguide analysis condition, and obtain the vibration-acoustic response of the waveguide analysis condition based on the waveguide analysis condition;

[0038] A vibration-acoustic coupling wave characteristic determination unit, configured to determine the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-solid coupling based on the calculation model for the transfer loss of the liquid-filled pipeline; the vibration-acoustic coupling wave characteristics include: the vibration-acoustic coupling wave number and the vibration-acoustic coupling wave mode;

[0039] A pipeline propagation wave information determination unit, configured to analyze the vibration-acoustic response based on the vibration-acoustic coupling wave of the liquid-filled pipeline based on the vibration-acoustic response of the waveguide analysis condition and the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline, and obtain the pipeline propagation wave information in the target liquid-filled pipeline; the pipeline propagation wave information includes: the number of types of pipeline propagation waves, the types of pipeline propagation waves, and the amplitudes of pipeline propagation waves;

[0040] A transfer loss determination unit, configured to use the perfectly matched layer technique to calculate the transfer loss of the target liquid-filled pipeline under the condition of acoustic-solid coupling based on the calculation model for the transfer loss of the liquid-filled pipeline and the pipeline propagation wave information.

[0041] In a third aspect, the present application provides a computer device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method for calculating the transfer loss of a liquid-filled pipeline under the condition of acoustic-solid coupling as described in any one of the above.

[0042] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the method for calculating the transfer loss of a liquid-filled pipeline under the condition of acoustic-solid coupling as described in any one of the above.

[0043] In a fifth aspect, the present application provides a computer program product, including a computer program which, when executed by a processor, implements the method for calculating the transmission loss of a liquid-filled pipeline under the acoustic-solid coupling condition described in any one of the above.

[0044] According to the specific embodiments provided by the present application, the present application has the following technical effects:

[0045] The present application discloses a method, system, device, medium and product for calculating the transmission loss of a liquid-filled pipeline under the acoustic-solid coupling condition. First, by calculating the characteristics of the vibration-acoustic coupling wave of the liquid-filled pipeline under the acoustic-solid coupling condition and setting waveguide analysis working conditions to conduct an analysis of the pipeline propagation wave information, the pipeline propagation wave information in the waveguide analysis working conditions is finally determined, replacing the existing plane wave theory, and improving the accuracy and effectiveness of calculating the transmission loss of the liquid-filled pipeline under the acoustic-solid coupling condition; secondly, aiming at the actual situation of the liquid-filled pipeline under the acoustic-solid coupling condition, the perfectly matched layer technology is introduced in the multi-condition method, thereby successfully overcoming the limitations in the multi-condition method and improving the effectiveness of calculating the transmission loss of the liquid-filled pipeline under the acoustic-solid coupling condition. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0047] Figure 1 Schematic flowchart of a method for calculating the transmission loss of a liquid-filled pipeline under the acoustic-solid coupling condition provided by an embodiment of the present application;

[0048] Figure 2 Schematic diagram of a calculation model for the transmission loss of a liquid-filled pipeline provided by an embodiment of the present application;

[0049] Figure 3 Schematic diagram of a calculation model for the transmission loss of a liquid-filled pipeline provided by another embodiment of the present application;

[0050] Figure 4 Schematic diagram of the calculation result of the transmission loss under the transmission loss calculation working condition combination 2-5 provided by another embodiment of the present application;

[0051] Figure 5 Schematic diagram of the structure of a computer device provided by an embodiment of the present application. Detailed Embodiments

[0052] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0053] Rather than relying on the plane wave theory, the present application is based on the vibration-acoustic coupled propagation wave in a liquid-filled pipeline under the condition of fluid-structure interaction, analyzes and clarifies the pipeline propagation wave information in the transmission loss calculation model. Furthermore, in the case where there are multiple propagation waves in the pipeline, the perfectly matched layer technology is adopted to overcome the calculation limitation, thereby achieving the purpose of calculating the transmission loss of the liquid-filled pipeline under the condition of fluid-structure interaction, and improving the accuracy and effectiveness of the calculation.

[0054] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] In an exemplary embodiment, as Figure 1 shown, a method for calculating the transmission loss of a liquid-filled pipeline under the condition of fluid-structure interaction is provided, including the following steps. Among them:

[0056] Step S1, construct a calculation model for the transmission loss of the liquid-filled pipeline under the condition of fluid-structure interaction of the target liquid-filled pipeline; as Figure 2 shown, the calculation model for the transmission loss of the liquid-filled pipeline includes: an intermediate unit, an inlet pipe, and an outlet pipe.

[0057] Specifically, select a certain section of the pipeline structure or a certain component in the liquid-filled pipeline (i.e., the target liquid-filled pipeline) as the intermediate unit in the calculation model for the transmission loss of the liquid-filled pipeline, and connect the inlet pipe and the outlet pipe before and after the intermediate unit respectively. The front and rear pipelines are both liquid-filled pipelines, including the fluid in the pipe and the pipe wall structure, thereby constructing a calculation model for the transmission loss of the liquid-filled pipeline under the condition of fluid-structure interaction.

[0058] Step S2, apply corresponding boundary conditions and excitations to the calculation model for the transmission loss of the liquid-filled pipeline, construct a waveguide analysis condition, and calculate the vibration-acoustic response of the waveguide analysis condition based on the waveguide analysis condition.

[0059] Specifically, specific boundary conditions need to be set for some boundaries in the calculation model for the transmission loss of the liquid-filled pipeline, and corresponding excitations also need to be set. After the boundary conditions and excitations are set, numerical calculations can be carried out. The present application names the model with boundary conditions and excitations applied as the waveguide analysis condition.

[0060] As an alternative implementation, in step S2, corresponding boundary conditions and excitations are applied to the calculation model of the fluid-filled pipeline transmission loss to construct a waveguide analysis condition, which specifically includes:

[0061] Step S21, respectively determine the fluid region surface and the structural region surface corresponding to the inlet pipe and the outlet pipe; the fluid region surface includes: the inlet fluid surface and the outlet fluid surface; the structural region surface includes: the inlet structural surface and the outlet structural surface.

[0062] The boundaries where boundary conditions need to be applied in the calculation model of the fluid-filled pipeline transmission loss are: the cross-sections of the two pipelines of the inlet pipe and the outlet pipe on the side far from the intermediate unit. And, both of these cross-sections have a fluid region surface corresponding to the fluid in the pipe and a structural region surface corresponding to the pipe wall structure. Therefore, there are a total of four surfaces as boundary surfaces, and boundary conditions need to be set. According to the pipeline position and its own medium where the boundary surface is located, the four surfaces are sequentially called the inlet structural surface, the inlet fluid surface, the outlet structural surface, and the outlet fluid surface.

[0063] Step S22, set the boundary condition of the structural region surface to be fixed, and set the boundary condition of the fluid region surface to be acoustically transparent.

[0064] Step S23, set the excitation of the calculation model of the fluid-filled pipeline transmission loss to be the sound wave vertically incident on the calculation model of the fluid-filled pipeline transmission loss on the inlet fluid surface, so as to construct the corresponding waveguide analysis condition.

[0065] As an alternative implementation, in step S2, based on the waveguide analysis condition, calculate the vibration-acoustic response of the waveguide analysis condition, which specifically includes:

[0066] Step S24, construct the control equation of the waveguide analysis condition; among them, use numerical means to construct the control equation of the waveguide analysis condition.

[0067] Step S25, solve the control equation of the waveguide analysis condition to obtain the vibration state value or noise state value (displacement or sound pressure) of each point in the calculation model of the fluid-filled pipeline transmission loss, and use the vibration state value or noise state value of each point as the vibration-acoustic response of the waveguide analysis condition. Through the above steps S24 to step S25, the vibration-acoustic response of the waveguide analysis condition can be predicted.

[0068] Step S3, based on the calculation model of the fluid-filled pipeline transmission loss, determine the vibration-acoustic coupling wave characteristics of the fluid-filled pipeline under the condition of acoustic-solid coupling; the vibration-acoustic coupling wave characteristics include: the vibration-acoustic coupling wave number and the vibration-acoustic coupling wave mode.

[0069] Based on the pipeline form in the calculation model of the fluid-filled pipeline transmission loss in step S1, solve the wave number and wave mode of the vibration-acoustic coupling wave of the fluid-filled pipeline under the condition of acoustic-solid coupling.

[0070] As an alternative implementation, step S3 specifically includes:

[0071] Step S31: Determine the liquid-solid wave equation and boundary conditions corresponding to the cross-section of the target liquid filling pipeline. Among them, the inside of the pipeline is a circular liquid area with a radius of a, and the outside is an annular wall structure with a thickness of h.

[0072] Step S32: Based on the liquid-solid wave equation and boundary conditions corresponding to the pipeline cross-section, construct a calculation model for the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-solid coupling; the calculation model for the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-solid coupling is shown in the following formulas (1)-(5):

[0073]

[0074] Among them, L1 is the potential function term of the fluid longitudinal wave, L2 is the potential function term of the structural longitudinal wave, L3 is the first term of the potential function of the structural transverse wave, and L4 is the second term of the potential function of the structural transverse wave; r, θ, and z are the radial, circumferential, and axial directions of the cylindrical coordinate system respectively; j is the imaginary unit; k z is the axial wave number; n is the circumferential serial number; ρ f is the fluid density, ω is the circular frequency; λ and μ are the Lame constants of the pipe wall structure.

[0075] In the above calculation model for the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-solid coupling, formula (1) corresponds to the pressure continuity condition on the inner wall of the pipeline; formula (2) corresponds to the displacement continuity condition on the inner wall of the pipeline; formula (3) corresponds to the condition that the pressure on the outer wall of the pipeline is 0; formula (4) corresponds to the condition that the shear force on the inner wall of the pipeline is 0; formula (5) corresponds to the condition that the shear force on the outer wall of the pipeline is 0.

[0076] Furthermore, in the above calculation model for the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-solid coupling, the expressions of L1, L2, L3, and L4 are as follows:

[0077]

[0078] Among them, K1, K2, …, K7 are undetermined amplitudes; J n and H n are the first and third kind of Bessel functions of order n respectively; k l is the structural longitudinal wave number, k t is the structural transverse wave number, k f is the fluid acoustic wave number, and t is the time.

[0079] Step S33: Solve the calculation model for the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-solid coupling to determine the vibration-acoustic coupling wave number and vibration-acoustic coupling wave mode of the liquid-filled pipeline under the condition of acoustic-solid coupling.

[0080] Specifically, the above acoustic-structure coupling wave characteristic calculation model is transformed into an eigenvalue problem: Q[K1 K2…K7] T = 0. Then, the roots of the equation where the determinant of Q is zero are obtained. The roots thus obtained correspond to the acoustic-structure coupling waveguide modes of the liquid-filled pipe. Among them, the eigenvalue is the wave number of the wave propagating in the pipe (the axial wave number of the mode), and the eigenvector is the waveform of the wave propagating in the pipe (i.e., the vibration mode of the mode).

[0081] Step S4: Based on the acoustic response under the waveguide analysis conditions and the acoustic-structure coupling wave characteristics of the liquid-filled pipe, analyze the acoustic response based on the acoustic-structure coupling wave of the liquid-filled pipe to obtain the information on the waves propagating in the pipe in the target liquid-filled pipeline; the information on the waves propagating in the pipe includes: the number of types of waves propagating in the pipe, the types (specific types) of waves propagating in the pipe, and the amplitudes of the waves propagating in the pipe.

[0082] As an optional implementation manner, step S4 specifically includes:

[0083] Step S41: Fit any state quantity of the pipe cross-sections of the inlet pipe and the outlet pipe in the acoustic response under the waveguide analysis conditions to obtain the corresponding fitted values of the state quantity respectively.

[0084] Specifically, the acoustic response can be expressed in the form of the superposition of waves of each order. The method of fitting the acoustic response is used to obtain the situation of the waves propagating in the liquid-filled pipeline. A certain state quantity X(f, z) of the pipe cross-section in the acoustic response is selected as the fitting object, and the fitted value of the state quantity is as follows:[[]]

[0085]

[0086] Among them, is the fitted value of the state quantity, i is the serial number of the wave propagating in the pipe, N is the number of types of waves propagating in the pipe, k i is the axial wave number of the i-th wave propagating in the pipe, is the fitted amplitude of the i-th forward wave propagating in the pipe, is the fitted amplitude of the i-th backward wave propagating in the pipe.

[0087] Step S42: Construct an objective function based on the state quantity and the corresponding fitted value of the state quantity.

[0088] Specifically, an optimization algorithm with the objective of minimizing the difference between and X is established. Through this algorithm, within the given range of and , a set of and within this range can be calculated. At this time, the difference between and X is the smallest within this range.

[0089] In step S43, iteratively solve the objective function to determine the pipeline propagation wave information in the target liquid-filled pipeline in the vibro-acoustic response.

[0090] Specifically, an iterative logic is adopted to continuously adjust the search range so that the local optimal solution approaches the global optimal solution: First, a set of search range centers, absolute value search ranges, and phase search ranges are given. After completing the optimization within this range, the result of this optimization is used as the center of the search range for the next optimization. At the same time, the shrinking methods for the absolute value search range and the phase search range are set. Thus, the next optimization is carried out. In addition, an error termination value and an iteration change rate termination value for the optimization target are set. When the error or iteration change rate obtained in a certain iteration is less than its termination value, the iteration terminates.

[0091] Based on the vibro-acoustic response analysis method of the liquid-filled pipeline vibration-acoustic coupling wave corresponding to the above steps S41 to S43, for a certain working condition, the pipeline propagation wave information in the vibro-acoustic response can be determined.

[0092] For example, for the inlet pipe and the outlet pipe in the waveguide analysis working condition respectively, the state quantity X(f, z) is selected, and the pipeline propagation wave information of the inlet pipe and the outlet pipe is obtained by fitting: the number of types N of the pipeline propagation wave, the specific types, and the pipeline propagation wave amplitude A i，u 、B i，u 、A i，d and B i，d . Among them, u and d respectively represent the inlet pipe and the outlet pipe of the calculation model, and A i，u represents the amplitude of the i-th forward propagation wave of the inlet pipe; B i，u represents the amplitude of the i-th backward propagation wave of the inlet pipe; A i，d represents the amplitude of the i-th forward propagation wave of the outlet pipe; B i，d represents the amplitude of the i-th backward propagation wave of the outlet pipe. The number of types of propagation waves obtained thereby indicates the pipeline propagation wave condition of the liquid-filled pipeline transmission loss model under acoustic excitation. Among them, the number of types of propagation waves N is greater than 1, which further indicates that under the condition of acoustic-solid coupling, there is more than one pipeline propagation wave, which is significantly different from the traditional calculation of transmission loss where there is only one type of propagation wave (i.e., plane acoustic wave).

[0093] Furthermore, after step S4, it further includes: verifying the correctness of the pipeline propagation wave information, specifically including:

[0094] By selecting another state quantity X'(f, z), the number of types N' of the pipeline propagation wave, the specific types, and the pipeline propagation wave amplitude (A i，u ', B i，u ', A i，d ' and B i，d'). Compare the newly obtained result with the original result. If the number of types of pipe-borne waves is the same (N = N'), the specific types are the same, and the ratio of the amplitudes of the pipe-borne waves obtained twice conforms to the wave mode (the vibro-acoustic coupling wave mode obtained through step S3), then the correctness of the fitting process and the obtained propagation wave condition is verified.

[0095] Step S5: Using the perfectly matched layer technique, based on the liquid-filled pipeline transmission loss calculation model and the pipe-borne wave information, calculate the transmission loss of the target liquid-filled pipeline under the condition of acoustic-solid coupling.

[0096] Among them, through step S4, it can be obtained that: under the condition of acoustic-solid coupling, there is more than one type of pipe-borne wave. Further analyze the limitations brought by the situation of pipes with multiple pipe-borne waves to the calculation of transmission loss.

[0097] Establish the relationship between each propagation wave under any number N of wave types:

[0098]

[0099] The relationship between the vibro-acoustic coupling waves represented by Equation (11). Now, let i = 1 correspond to the coupled transmission acoustic wave (the coupled transmission acoustic wave is one of the vibro-acoustic coupling waves, and the transmission loss corresponds to the incidence, reflection, and transmission of the coupled transmission acoustic wave), then the transmission loss corresponds to T in the above formula. 11 . To calculate T 11 , construct an equation:

[0100]

[0101] Among them, Cases represents the s-th working condition, s = 1, 2,..., 2M. This requires that there must be 2M working conditions, and the sets of amplitudes of the pipe-borne waves provided by each working condition are linearly independent, forming a limiting condition. Therefore, the present application proposes to use the perfectly matched layer technique to solve the above limiting conditions. The perfectly matched layer technique is a method for providing a non-reflecting boundary. This technique requires setting a thin layer on the boundary of the liquid-filled pipeline transmission loss calculation model. By setting the relevant parameters of the thin layer, the characteristics of this thin layer can be perfectly matched with the wave propagation characteristics in the liquid-filled pipeline transmission loss calculation model. At this time, the waves incident on this boundary in the liquid-filled pipeline transmission loss calculation model can all enter the thin layer. Moreover, the perfectly matched layer can dissipate the waves, so that no wave can be reflected back into the liquid-filled pipeline transmission loss calculation model. Thus, for the liquid-filled pipeline transmission loss calculation model, this boundary becomes a non-reflecting wave absorption boundary. It should be noted that the purpose of introducing the perfectly matched layer in the present application is to conveniently set a sufficient number of mutually independent working conditions, and whether the interface can perfectly absorb the propagation waves is not within the scope of concern of the present application.

[0102] As an alternative implementation, step S5 specifically includes:

[0103] Step S51, obtain multiple calculation models for the transmission loss of the liquid filling pipelines. Obtain 2M calculation models for the transmission loss of the liquid filling pipelines in the same form.

[0104] Step S52, stretch the boundary surfaces of the inlet pipe and the outlet pipe of each calculation model for the transmission loss of the liquid filling pipeline outward to form corresponding thin layers, and set each of the thin layers as a perfectly matched layer; the boundary surfaces include: the structural region surface and the fluid region surface; the perfectly matched layer adopts the coordinate stretching method, specifically where is the dimensionless coordinate of this layer, and λ t is a parameter that needs to be set manually.

[0105] Step S53, use the perfectly matched layers corresponding to different thin layers to construct multiple calculation conditions for the transmission loss.

[0106] Specifically, in the perfectly matched layers with different λ t , construct 2M calculation conditions for the transmission loss. The calculation of the transmission loss constructed by the perfectly matched layer meets the calculation requirements: since perfectly matched layers are arranged on both the structural boundary surface and the fluid boundary surface, the movements of the pipe wall and the fluid will be absorbed. Therefore, when the parameters of the perfectly matched layer are changed, the characteristics of the pipe boundary surface can change significantly. At the same time, the reflection situation of the pipe propagation wave will also change accordingly. In addition, since the reflection characteristics of the inlet and outlet boundary surfaces have both changed, the amplitude ratio of the pipe propagation waves in the inlet and outlet pipes is also different. Therefore, the amplitude relationship of the propagation waves between each calculation condition for the transmission loss meets the calculation requirements.

[0107] Step S54, calculate the amplitude of the pipe propagation wave of the corresponding inlet pipe and the amplitude of the pipe propagation wave of the corresponding outlet pipe in different calculation conditions for the transmission loss.

[0108] Specifically, for the inlet pipe and the outlet pipe in 2M calculation conditions for the transmission loss in sequence, carry out the calculation of the amplitude of the propagation wave, and obtain T 11 (T 11 represents the ratio relationship between the incident coupled transmitted sound wave and its corresponding transmitted coupled transmitted sound wave).

[0109] Step S55, based on the amplitude of the pipe propagation wave of the corresponding inlet pipe and the amplitude of the pipe propagation wave of the corresponding outlet pipe in different calculation conditions for the transmission loss, determine the transmission loss of the target liquid filling pipeline under the acoustic-solid coupling condition.

[0110] Specifically, calculate the transmission loss TL through the following formula.

[0111] TL = 20log 10 |1 / T11 | (13)

[0112] Based on the basic principle of wave propagation, the transmission loss is only related to the characteristics of the pipeline unit itself and has nothing to do with the conditions upstream and downstream of the pipeline. According to this property, it can be known that the selection of working conditions has nothing to do with the transmission loss.

[0113] Furthermore, verify the correctness of the transmission loss of the target liquid-filled pipeline under the condition of acoustic-structure coupling:

[0114] Set another new working condition to calculate the corresponding amplitude of the propagating wave; then randomly replace some of the original working conditions with the new working condition, and further calculate the transmission loss results under different combinations of working conditions. If the transmission loss results are consistent with each other, it proves the correctness of the transmission loss results.

[0115] Beneficial effects:

[0116] At present, the plane wave theory based on the acoustics of hard-wall pipelines does not conform to the propagation wave situation in the liquid-filled pipeline under the condition of acoustic-structure coupling, and it is impossible to calculate the transmission loss that truly reflects the characteristics of the unit itself. The calculation method of the transmission loss of the liquid-filled pipeline under the condition of acoustic-structure coupling proposed in this application has the following advantages:

[0117] 1) By calculating the characteristics of the vibration-acoustic coupling wave of the liquid-filled pipeline under the condition of acoustic-structure coupling, and setting up the waveguide analysis working condition to conduct the analysis of the pipeline propagation wave information, finally determine the pipeline propagation wave information in the waveguide analysis working condition, replacing the existing plane wave theory, and improving the accuracy and effectiveness of the calculation of the transmission loss of the liquid-filled pipeline under the condition of acoustic-structure coupling.

[0118] 2) Aiming at the actual situation of the liquid-filled pipeline under the condition of acoustic-structure coupling, the perfectly matched layer technology is introduced into the multi-working condition method, and thus the limitations in the multi-working condition method are successfully overcome. Among them, the purpose of applying the perfectly matched layer is to simply and directly construct a sufficient number of working conditions for calculating the transmission loss that meet the requirements. This is different from the original design intention of the existing perfectly matched layer technology that pursues perfect absorption. And the perfectly matched layer can play a role when there is a vibration-acoustic coupling wave in the pipeline.

[0119] The following takes a specific embodiment to further elaborate on the calculation method of the transmission loss of the liquid-filled pipeline under the condition of acoustic-structure coupling in this application.

[0120] Step 1, as Figure 3 shown, take the thin steel wall simple expansion chamber as the intermediate unit, set up the calculation model of the transmission loss of the liquid-filled pipeline under the condition of acoustic-structure coupling, construct the waveguide analysis working condition, and calculate the vibration-acoustic response of the waveguide analysis working condition. Among them, the inner diameter of the water-filled steel pipe is 125 mm, the wall thickness is 4 mm, the length is 4 m, the inner diameter of the expansion chamber is 250 mm, the length is 0.6 m, the thickness of the outer wall and the end plate is the same as the wall thickness of the pipeline, and the amplitude of the incident sound source is 1 Pa.

[0121] Step 2. Secondly, calculate the vibro-acoustic coupled waveguide modes (i.e., vibro-acoustic coupled wave characteristics) of the water-filled steel pipe.

[0122] Step 3. Set the fitting formula. In addition, set the fitting parameters: the search center, the absolute value search range, and the phase search range for the first iteration are 0.2max(X), [0.2, 5], and [-π, π], respectively; the search center for the m-th iteration is the result of the previous iteration, the absolute value search range is [1 - 0.1 / (m - 1), 1 + 0.1 / (m - 1)], and the phase search range is [μ - 0.2π / (m - 1), μ + 0.2π / (m - 1)], where μ is the phase output in the previous iteration; the iteration termination criterion is and the average relative error of and X(z) is less than 0.01%, or and the change rate of is less than 0.1%.

[0123] Step 4. Conduct the fitting of the axial sound pressure to obtain the pipeline propagation wave information. Thus, it is determined that there are two coupled waves (N = 2) in the pipeline, namely the lowest-order coupled acoustic wave and the lowest-order coupled longitudinal vibration wave.

[0124] Step 5. Conduct the fitting of the outer wall axial displacement, and the obtained result corresponds to the previously fitted result, verifying the correctness of the fitting process and the pipeline propagation wave information.

[0125] Step 6. The obtained propagation wave information requires 4 working conditions. Set 4 calculation models for the transmission loss of the liquid-filled pipeline. The excitation source is set as the axial point sound source of 0.1 N / m and the structural longitudinal displacement of 10 -8 Pa on the inlet surface. Set a perfectly matched layer with a thickness of 50 mm on the inlet and outlet boundaries of the calculation model for the transmission loss of the liquid-filled pipeline, and sequentially set the perfectly matched layer parameters λ t as 370 / f, 740 / f, 1110 / f, and 1480 / f, and then construct 4 calculation conditions for the transmission loss from this, and calculate the vibro-acoustic responses of each calculation condition for the transmission loss.

[0126] Step 7. Sequentially fit the axial sound pressure of the inlet and outlet pipes of each calculation condition for the transmission loss to obtain the pipeline propagation wave amplitude, and calculate the transmission loss of the target liquid-filled pipeline under the condition of acoustic-solid coupling through the pipeline propagation wave amplitudes of the 4 calculation conditions for the transmission loss.

[0127] Step 8. Verify the correctness of the transmission loss of the target liquid-filled pipeline under the condition of acoustic-solid coupling: Add 1 new calculation condition for the transmission loss, which is based on the original transmission

[0128] loss calculation condition and change the perfectly matched layer parameter λ tis 1850 / f, and calculate the amplitude of the propagating wave for the new transmission loss calculation condition. Define the original transmission loss calculation condition combination as transmission loss calculation condition combination 1. Then, sequentially replace the original 4 transmission loss calculation conditions with the new transmission loss calculation conditions to form transmission loss calculation condition combinations 2-5. Calculate the transmission losses under transmission loss calculation condition combinations 2-5, and the calculation results are as Figure 4 shown. After comparison, the transmission loss results under each transmission loss calculation condition combination are basically the same, verifying the correctness of the transmission loss of the target liquid-filled pipeline under the acoustic-solid coupling condition.

[0129] Based on the same inventive concept, the embodiment of the present application also provides a liquid-filled pipeline transmission loss calculation system under acoustic-solid coupling conditions for implementing the above-mentioned liquid-filled pipeline transmission loss calculation method under acoustic-solid coupling conditions. The solution provided by this system to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the liquid-filled pipeline transmission loss calculation system under acoustic-solid coupling conditions provided below can refer to the limitations on the liquid-filled pipeline transmission loss calculation method under acoustic-solid coupling conditions in the above text, and will not be repeated here.

[0130] In an exemplary embodiment, a liquid-filled pipeline transmission loss calculation system under acoustic-solid coupling conditions is provided, including:

[0131] A model construction unit for constructing a liquid-filled pipeline transmission loss calculation model of the target liquid-filled pipeline under acoustic-solid coupling conditions; the liquid-filled pipeline includes: an intermediate unit, an inlet pipe, and an outlet pipe.

[0132] A waveguide analysis condition and vibration-acoustic response determination unit for applying corresponding boundary conditions and excitations to the liquid-filled pipeline transmission loss calculation model, constructing waveguide analysis conditions, and obtaining the vibration-acoustic response of the waveguide analysis conditions based on the waveguide analysis conditions.

[0133] A vibration-acoustic coupling wave characteristic determination unit for determining the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline under acoustic-solid coupling conditions based on the liquid-filled pipeline transmission loss calculation model; the vibration-acoustic coupling wave characteristics include: the vibration-acoustic coupling wave number and the vibration-acoustic coupling wave mode.

[0134] A pipeline propagation wave information determination unit for analyzing the vibration-acoustic response based on the vibration-acoustic coupling wave of the liquid-filled pipeline according to the vibration-acoustic response of the waveguide analysis conditions and the vibration-acoustic coupling wave characteristics of the liquid-filled pipeline, and obtaining the pipeline propagation wave information in the target liquid-filled pipeline; the pipeline propagation wave information includes: the number of types of pipeline propagation waves, the types of pipeline propagation waves, and the amplitude of the pipeline propagation waves.

[0135] A transmission loss determination unit, which uses the perfect matching layer technology to calculate the transmission loss of a target liquid-filled pipeline under the acoustic-solid coupling condition based on the transmission loss calculation model of the liquid-filled pipeline and the pipeline propagation wave information.

[0136] In an exemplary embodiment, a computer device is provided, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the computer program to implement a method for calculating the transmission loss of a liquid-filled pipeline under the acoustic-solid coupling condition.

[0137] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, it implements a method for calculating the transmission loss of a liquid-filled pipeline under the acoustic-solid coupling condition.

[0138] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, it implements a method for calculating the transmission loss of a liquid-filled pipeline under the acoustic-solid coupling condition.

[0139] In an exemplary embodiment, a computer device is provided. The computer device can be a server or a terminal, and its internal structure diagram can be as Figure 5 shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a method for calculating the transmission loss of a liquid-filled pipeline under the acoustic-solid coupling condition.

[0140] Those skilled in the art can understand that Figure 5 the structure shown in

[0141] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0142] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memories can include read-only memory (ROM), magnetic tapes, floppy disks, flash memories, optical memories, high-density embedded non-volatile memories, resistive random access memories (ReRAMs), magnetoresistive random access memories (MRAMs), ferroelectric random access memories (FRAMs), phase change memories (PCMs), graphene memories, etc. Volatile memories can include random access memories (RAMs) or external caches, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0143] The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logics, data processing logics based on quantum computing, etc., without limitation.

[0144] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0145] In this text, specific examples are used to elaborate on the principles and implementation modes of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation modes and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A calculation method for the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure coupling, characterized in that, The calculation method for the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure coupling includes: Constructing a calculation model for the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure coupling; the calculation model for the transmission loss of the liquid-filled pipeline includes: intermediate units, an inlet pipe, and an outlet pipe; Applying corresponding boundary conditions and excitations to the calculation model for the transmission loss of the liquid-filled pipeline, constructing a waveguide analysis condition, and calculating the vibro-acoustic response of the waveguide analysis condition based on the waveguide analysis condition; Based on the calculation model for the transmission loss of the liquid-filled pipeline, determining the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-structure coupling; the vibro-acoustic coupling wave characteristics include: the vibro-acoustic coupling wave number and the vibro-acoustic coupling wave mode; Based on the vibro-acoustic response of the waveguide analysis condition and the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline, analyzing the vibro-acoustic response based on the vibro-acoustic coupling wave of the liquid-filled pipeline to obtain the pipeline propagation wave information in the target liquid-filled pipeline; the pipeline propagation wave information includes: the number of types of pipeline propagation waves, the types of pipeline propagation waves, and the amplitudes of the pipeline propagation waves; Using the perfectly matched layer technique, calculating the transmission loss of the target liquid-filled pipeline under the condition of acoustic-structure coupling based on the calculation model for the transmission loss of the liquid-filled pipeline and the pipeline propagation wave information.

2. The method for calculating the transmission loss of a liquid-filled pipeline under acoustic-structure coupling conditions according to claim 1, wherein Applying corresponding boundary conditions and excitations to the calculation model for the transmission loss of the liquid-filled pipeline, constructing a waveguide analysis condition, specifically including: Respectively determining the fluid region surfaces and structural region surfaces corresponding to the inlet pipe and the outlet pipe; the fluid region surfaces include: an inlet fluid surface and an outlet fluid surface; the structural region surfaces include: an inlet structural surface and an outlet structural surface; Setting the boundary conditions of the structural region surfaces to be fixed and setting the boundary conditions of the fluid region surfaces to be acoustically transparent; Setting the excitation of the calculation model for the transmission loss of the liquid-filled pipeline to be the sound wave vertically incident on the calculation model for the transmission loss of the liquid-filled pipeline on the inlet fluid surface, thereby constructing the corresponding waveguide analysis condition.

3. The calculation method of the transmission loss of a liquid-filled pipeline under the condition of acoustic-solid coupling according to claim 2, characterized in that, Based on the waveguide analysis condition, calculating the vibro-acoustic response of the waveguide analysis condition, specifically including: Constructing the control equation of the waveguide analysis condition; Solving the control equation of the waveguide analysis condition to obtain the vibration state values or noise state values of each point in the calculation model for the transmission loss of the liquid-filled pipeline, and taking the vibration state values or noise state values of each point as the vibro-acoustic response of the waveguide analysis condition.

4. The calculation method of the transmission loss of a liquid-filled pipeline under the condition of acoustic-solid coupling according to claim 1, characterized in that, Based on the calculation model for the transmission loss of the liquid-filled pipeline, determining the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-structure coupling, specifically including: Determining the liquid-solid wave equation and boundary conditions corresponding to the pipeline cross-section of the target liquid-filled pipeline; Based on the liquid-solid wave equation and boundary conditions corresponding to the pipeline cross-section, constructing a calculation model for the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-structure coupling; Solving the calculation model for the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline under the condition of acoustic-structure coupling to determine the vibro-acoustic coupling wave number and the vibro-acoustic coupling wave mode of the liquid-filled pipeline under the condition of acoustic-structure coupling.

5. The method for calculating the transmission loss of a liquid-filled pipeline under acoustic-solid coupling conditions according to claim 1, characterized in that, Based on the vibro-acoustic response of the waveguide analysis condition and the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline, analyzing the vibro-acoustic response based on the vibro-acoustic coupling wave of the liquid-filled pipeline to obtain the pipeline propagation wave information in the target liquid-filled pipeline, specifically including: Fit any state quantity of the pipe cross-sections of the inlet pipe and the outlet pipe in the vibro-acoustic response of the waveguide analysis condition to obtain the corresponding fitted values of the state quantity respectively; Construct an objective function based on the state quantity and the corresponding fitted value of the state quantity; Perform iterative solution on the objective function to determine the pipe propagation wave information in the target liquid-filled pipeline in the vibro-acoustic response.

6. The method for calculating the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure coupling according to claim 1, wherein Using the perfectly matched layer technique, calculate the transmission loss of the target liquid-filled pipeline under the acoustic-solid coupling condition based on the liquid-filled pipeline transmission loss calculation model and the pipe propagation wave information, specifically including: Obtain multiple liquid-filled pipeline transmission loss calculation models; Stretch the boundary surfaces of the inlet pipe and the outlet pipe of each liquid-filled pipeline transmission loss calculation model outward to form corresponding thin layers, and set each of the thin layers as a perfectly matched layer; the boundary surfaces include: the structural region surface and the fluid region surface; Construct multiple transmission loss calculation conditions using the perfectly matched layers corresponding to different thin layers; Calculate the pipe propagation wave amplitude of the corresponding inlet pipe and the pipe propagation wave amplitude of the corresponding outlet pipe in different transmission loss calculation conditions; Determine the transmission loss of the target liquid-filled pipeline under the acoustic-solid coupling condition based on the pipe propagation wave amplitude of the corresponding inlet pipe and the pipe propagation wave amplitude of the corresponding outlet pipe in different transmission loss calculation conditions.

7. A calculation system for the transmission loss of a liquid-filled pipeline under the condition of acoustic-solid coupling, characterized in that, The liquid-filled pipeline transmission loss calculation system under the acoustic-solid coupling condition is used to implement the liquid-filled pipeline transmission loss calculation method under the acoustic-solid coupling condition described in any one of claims 1-6. The liquid-filled pipeline transmission loss calculation system under the acoustic-solid coupling condition includes: A model construction unit for constructing a liquid-filled pipeline transmission loss calculation model of the target liquid-filled pipeline under the acoustic-solid coupling condition; the liquid-filled pipeline includes: an intermediate unit, an inlet pipe, and an outlet pipe; A waveguide analysis condition and vibro-acoustic response determination unit for applying corresponding boundary conditions and excitations to the liquid-filled pipeline transmission loss calculation model, constructing a waveguide analysis condition, and obtaining the vibro-acoustic response of the waveguide analysis condition based on the waveguide analysis condition; A vibro-acoustic coupling wave characteristic determination unit for determining the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline under the acoustic-solid coupling condition based on the liquid-filled pipeline transmission loss calculation model; the vibro-acoustic coupling wave characteristics include: the vibro-acoustic coupling wave number and the vibro-acoustic coupling wave mode; A pipe propagation wave information determination unit for analyzing the vibro-acoustic response based on the vibro-acoustic coupling wave of the liquid-filled pipeline based on the vibro-acoustic response of the waveguide analysis condition and the vibro-acoustic coupling wave characteristics of the liquid-filled pipeline to obtain the pipe propagation wave information in the target liquid-filled pipeline; the pipe propagation wave information includes: the number of types of pipe propagation waves, the types of pipe propagation waves, and the amplitude of the pipe propagation wave; A transmission loss determination unit for calculating the transmission loss of the target liquid-filled pipeline under the acoustic-solid coupling condition using the perfectly matched layer technique based on the liquid-filled pipeline transmission loss calculation model and the pipe propagation wave information.

8. A computer device, comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the liquid-filled pipeline transmission loss calculation method under the acoustic-solid coupling condition described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the calculation method of the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure coupling according to any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the calculation method of the transmission loss of a liquid-filled pipeline under the condition of acoustic-structure coupling according to any one of claims 1-6.

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