CN112214842A - Acoustic liner design method, apparatus, device and storage medium - Google Patents

Acoustic liner design method, apparatus, device and storage medium Download PDF

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CN112214842A
CN112214842A CN202011193668.4A CN202011193668A CN112214842A CN 112214842 A CN112214842 A CN 112214842A CN 202011193668 A CN202011193668 A CN 202011193668A CN 112214842 A CN112214842 A CN 112214842A
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acoustic
liner
sound
sound pressure
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CN112214842B (en
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张涛
林大楷
张颖哲
陈超
陈哲
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Commercial Aircraft Corp of China Ltd
Beijing Aeronautic Science and Technology Research Institute of COMAC
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Beijing Aeronautic Science and Technology Research Institute of COMAC
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Abstract

The embodiment of the invention discloses a sound liner design method, a sound liner design device, sound liner design equipment and a storage medium. The method comprises the following steps: selecting sample values of the acoustic liner geometric parameters according to the value range and the sampling interval of the acoustic liner geometric parameters; inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value; carrying out parametric modeling on the inner and outer molded surfaces of the nacelle containing the sound liner to obtain a sound transmission grid; determining sound pressure of each monitoring point based on the sound propagation grid and the acoustic impedance value; determining noise loss based on the sound pressure of each monitoring point, and judging whether the noise loss meets a set condition; if the noise loss meets the set condition, generating a sample value of the next generation of acoustic liner geometric parameters, and returning to execute the operation of inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value until the noise loss meets the set condition; and determining the sample value corresponding to the noise loss meeting the set condition as the geometric parameter of the target sound liner. The determination of the geometric parameters of the nacelle acoustic liner can be simplified.

Description

Acoustic liner design method, apparatus, device and storage medium
Technical Field
The embodiment of the invention relates to the technical field of nacelle sound liner design, in particular to a sound liner design method, a sound liner design device, sound liner design equipment and a storage medium.
Background
The problem of civil aircraft engine noise presents an important problem for the continuing growth of the air transportation industry. The magnitude of the engine noise level is directly related to the acquisition of the engine airworthiness visa. This is undoubtedly a huge challenge for civil aircraft engines being developed in our country. The noise level of a large civil aircraft is one of the important contents of airworthiness evidence obtaining, and the noise evidence obtaining standard is continuously changed along with the time.
Fan noise is the primary source of noise in modern civilian aircraft engines at take-off and landing. Since the advent of jet aircraft engines, acoustic liners have been the dominant means of engine noise control. In recent years, with the innovation of the noise reduction technology of the nacelle, an adaptive noise liner technology, a multi-degree-of-freedom noise liner technology, a seamless noise liner technology and the like are developed. However, the prior art also lacks efficient design means in terms of the geometric parameter design of the nacelle acoustic liner directly oriented to a complex profile.
Disclosure of Invention
The embodiment of the invention provides a sound liner design method, a sound liner design device, sound liner design equipment and a storage medium, which can simplify the process of determining geometrical parameters of a sound liner of a nacelle.
In a first aspect, an embodiment of the present invention provides an acoustic liner design method, including:
selecting sample values of the acoustic liner geometric parameters according to the value range and the sampling interval of the acoustic liner geometric parameters;
inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value;
carrying out parametric modeling on the inner and outer molded surfaces of the nacelle containing the sound liner to obtain a sound transmission grid;
determining sound pressure of each monitoring point based on the sound propagation grid and the acoustic impedance value; wherein the sound pressure is the sound pressure under the condition of the sound liner;
determining noise loss based on the sound pressure of each monitoring point, and judging whether the noise loss meets a set condition;
if the noise loss meets the set condition, generating a sample value of the next generation of acoustic liner geometric parameters, and returning to execute the operation of inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value until the noise loss meets the set condition;
and determining the sample value corresponding to the noise loss meeting the set condition as the geometric parameter of the target sound liner.
Further, the acoustic liner geometric parameters include perforated plate hole diameter, thickness, perforation rate, and honeycomb core thickness.
Further, the sample value is input into a set acoustic impedance model to obtain an acoustic impedance value, and the acoustic impedance value is calculated according to the following formula:
Z＝Ro+Rof+SrVp+Rcm+i[Xm+SmVp+Xem-cot(kh)]，
wherein R iso+Rof＝real(iω(t+εrd)/cσ/F(ksr))，
Xm+Xem＝imaginary(iω(t+εrd)/cσ/F(ksr)), Z is an acoustic impedance; roAnd RofLinear dimensionless acoustic resistances independent and dependent on frequency, respectively; xmAnd XemDimensionless mass acoustic reactance and end correction (including flow effects), respectively; srIs the nonlinear acoustic resistance change slope; smThe slope of the change of the nonlinear mass acoustic reactance; vpRMS value of the acoustic particle velocity in the full frequency range; rcmDimensionless acoustic resistance induced for tangential flow; c is the atmospheric sound velocity; k is the free space wavenumber; omega is the circular frequency; r is the hole radius; epsilonrAnd εxFor the real and imaginary parts of ε, for calculating the effective mass end correction ε d, F (k)sr) represents microVelocity profile of the average cross section of the bore, ksThe number of viscous stokes, t the thickness, h the honeycomb core thickness, σ the perforation rate, and d the perforation hole diameter of the perforated plate.
Further, parametrically modeling the inner and outer nacelle profiles containing the acoustic liner to obtain an acoustic propagation mesh, comprising:
obtaining a coordinate point of inner and outer profile parameterization of the nacelle containing the acoustic liner;
modeling inner and outer molded surfaces of the nacelle based on the coordinate points to obtain an acoustic propagation grid.
Further, determining a sound pressure for each monitoring point based on the acoustic propagation grid and the acoustic impedance value comprises:
and establishing an acoustic propagation calculation model based on the acoustic propagation grid and the acoustic impedance value, and performing acoustic propagation calculation including an acoustic liner effect to obtain the sound pressure of each monitoring point.
Further, determining the noise loss based on the sound pressure of each monitoring point is calculated according to the following formula:
Figure BDA0002753403900000031
wherein Δ PWL is the noise loss; theta far field measurement point polar angle; theta1The lower limit of the polar angle of a far-field measuring point; theta2The upper limit of polar angle of far-field measuring point; p is a radical ofHSound pressure of the monitoring point in the case of a silent lining; p is a radical ofLSound pressure of the monitoring point in the presence of the acoustic liner.
Furthermore, the sound pressure of the monitoring point under the condition of the silent lining is determined in the following mode:
and performing sound transmission calculation in a solid wall state based on the sound transmission grid to obtain the sound pressure of each monitoring point under the condition of no sound lining.
In a second aspect, an embodiment of the present invention further provides an acoustic liner designing apparatus, including:
the sample value selection module is used for selecting the sample value of the acoustic liner geometric parameter according to the value range and the sampling interval of the acoustic liner geometric parameter;
the acoustic impedance value acquisition module is used for inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value;
the sound propagation grid acquisition module is used for carrying out parametric modeling on the inner and outer molded surfaces of the nacelle containing the sound liner to obtain a sound propagation grid;
a sound pressure determination module for determining the sound pressure of each monitoring point based on the acoustic propagation grid and the acoustic impedance value; wherein the sound pressure is the sound pressure under the condition of the sound liner;
the noise loss determining module is used for determining noise loss based on the sound pressure of each monitoring point and judging whether the noise loss meets a set condition;
the next generation sample value generation module is used for generating a sample value of the next generation acoustic liner geometric parameter when the noise loss does not meet the set condition, and returning to execute the operation of inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value until the noise loss meets the set condition;
and the target acoustic liner geometric parameter determining module is used for determining the sample values corresponding to the noise loss meeting the set conditions as the target acoustic liner geometric parameters.
In a third aspect, an embodiment of the present invention further provides a computer device, where the computer device includes: comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the acoustic liner design method according to an embodiment of the invention when executing the program.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processing apparatus, implements a sound liner design method according to an embodiment of the present invention.
The embodiment of the invention discloses a sound liner design method, a sound liner design device, sound liner design equipment and a storage medium. Selecting a sample value of the geometric parameter of the acoustic liner according to the value range and the sampling interval of the geometric parameter of the acoustic liner, inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value, carrying out parametric modeling on the inner and outer molded surfaces of the nacelle containing the acoustic liner to obtain an acoustic propagation grid, and determining the sound pressure of each monitoring point based on the acoustic propagation grid and the acoustic impedance value; and if the noise loss does not meet the set conditions, generating a sample value of the next generation of acoustic liner geometric parameters, returning to execute the operation of inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value until the noise loss meets the set conditions, and determining the sample value corresponding to the noise loss meeting the set conditions as the target acoustic liner geometric parameters. The sound liner design method provided by the embodiment of the invention can simplify the process of determining the geometric parameters of the sound liner of the nacelle.
Drawings
FIG. 1 is a flow chart of a method of designing an acoustic liner according to a first embodiment of the present invention;
FIG. 2a is a schematic view of an aircraft nacelle air inlet according to an embodiment of the invention;
FIG. 2b is a schematic view of a single layer acoustic liner structure in accordance with one embodiment of the present invention;
FIG. 3 is a diagram illustrating a process of calculating a noise loss function according to a first embodiment of the present invention;
FIG. 4 is a diagram of an iterative process for geometric parameter optimization of an acoustic liner according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an acoustic liner design apparatus according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a computer device in a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a sound liner design method according to an embodiment of the present invention, where the embodiment is applicable to a case of designing geometric parameters of a sound liner of an aircraft nacelle, and the method may be executed by a sound liner design apparatus, and specifically includes the following steps:
and step 110, selecting sample values of the acoustic liner geometric parameters according to the value range and the sampling interval of the acoustic liner geometric parameters.
The value range and the sampling interval can be determined according to experience or design requirements. The acoustic liner may be an acoustic liner in a nacelle of an aircraft. For example, fig. 2a is a schematic view of an aircraft nacelle inlet structure in this embodiment, and as shown in fig. 2a, the acoustic liner structure is a single-layer acoustic liner structure. Fig. 2b is a schematic diagram of a single-layer acoustic liner structure in this embodiment, and as shown in fig. 2b, the acoustic liner is composed of a layer of perforated face sheet, honeycomb core material and back sheet. The acoustic liner has 4 main geometric characteristic parameters which are the diameters of the small holes of the perforated plate respectively, and the value range is 1.0-2.4 mm; the thickness t is in the range of 0.5-1.0 mm; the perforation rate sigma ranges from 6.4% to 13.2%; and the thickness h of the honeycomb core ranges from 3.81cm to 7.62 cm. In this embodiment, 3 characteristic frequencies are designed at the same time, and the characteristic frequencies are about 1500Hz, 2000Hz, and 2500Hz, respectively.
Specifically, sampling is carried out by adopting a Latin hypercube sampling method according to sampling intervals in the value range of the acoustic liner geometric parameters, and a plurality of groups of acoustic liner geometric parameters are obtained and used as initial sample values. For example, in one design example, the initial sample point is 30. .
And step 120, inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value.
Wherein the set acoustic impedance model may be a Goodrich acoustic impedance model. Specifically, after a plurality of groups of acoustic liner geometric parameters are obtained, each group of acoustic liner geometric parameters are input into a set acoustic impedance model, and acoustic impedance values are obtained.
In this embodiment, the sample value is input to a set acoustic impedance model to obtain an acoustic impedance value, and the acoustic impedance value is calculated according to the following formula:
Z＝Ro+Rof+SrVp+Rcm+i[Xm+SmVp+Xem-cot(kh)]，
wherein R iso+Rof＝real(iω(t+εrd)/cσ/F(ksr))，
Xm+Xem＝imaginary(iω(t+εrd)/cσ/F(ksr)), Z is an acoustic impedance; roAnd RofLinear dimensionless acoustic resistances independent and dependent on frequency, respectively; xmAnd XemDimensionless mass acoustic reactance and end correction (including flow effects), respectively; srIs the nonlinear acoustic resistance change slope; smThe slope of the change of the nonlinear mass acoustic reactance; vpRMS value of the acoustic particle velocity in the full frequency range; rcmDimensionless acoustic resistance induced for tangential flow; c is the atmospheric sound velocity; k is the free space wavenumber; omega is the circular frequency; r is the hole radius; epsilonrAnd εxFor the real and imaginary parts of ε, for calculating the effective mass end correction ε d, F (k)sr) velocity profile, k, representing the mean cross section of the microporessThe number of viscous stokes, t the thickness, h the honeycomb core thickness, σ the perforation rate, and d the perforation hole diameter of the perforated plate.
And step 130, carrying out parametric modeling on the inner and outer molded surfaces of the nacelle containing the sound liner to obtain a sound transmission grid.
Wherein, the modeling process can be completed by adopting ICEM CFD software.
Specifically, the parametric modeling of the inner and outer profiles of the nacelle including the acoustic liner may be performed in a manner of obtaining an acoustic propagation mesh: obtaining a coordinate point of inner and outer profile parameterization of the nacelle containing the acoustic liner; modeling of the inner and outer molded surfaces of the nacelle is carried out based on the coordinate points, and a sound propagation grid is obtained.
And step 140, determining the sound pressure of each monitoring point based on the sound propagation grid and the acoustic impedance value.
The sound pressure is a sound pressure in the case of an acoustic liner.
Specifically, the manner of determining the sound pressure of each monitoring point based on the sound propagation grid and the acoustic impedance value may be: and establishing an acoustic propagation calculation model based on the acoustic propagation grids and the acoustic impedance values, and performing acoustic propagation calculation including an acoustic liner effect to obtain the sound pressure of each monitoring point. The modeling and calculation processes may be accomplished using ACTRAN software.
And 150, determining noise loss based on the sound pressure of each monitoring point, and judging whether the noise loss meets the set conditions.
Specifically, the noise loss is determined based on the sound pressure of each monitoring point and calculated according to the following formula:
Figure BDA0002753403900000081
wherein Δ PWL is the noise loss; theta far field measurement point polar angle; theta1The lower limit of the polar angle of a far-field measuring point; theta2The upper limit of polar angle of far-field measuring point; p is a radical ofHSound pressure of the monitoring point in the case of a silent lining; p is a radical ofLSound pressure of the monitoring point in the presence of the acoustic liner.
The method for determining the sound pressure of the monitoring point under the condition of no sound lining comprises the following steps: and performing sound transmission calculation in a solid wall state based on the sound transmission grid to obtain the sound pressure of each monitoring point under the condition of no sound lining. Fig. 3 is a diagram illustrating a calculation process of the noise loss function in the present embodiment.
And 160, if the noise loss does not meet the set conditions, generating a sample value of the next generation acoustic liner geometric parameters, and returning to execute the step 120 until the noise loss meets the set conditions.
Wherein the setting condition may be that the noise loss is smaller than a set value. Illustratively, fig. 4 is a diagram of an iterative process of geometric parameter optimization of the acoustic liner in the present embodiment.
Step 170, determining the sample value corresponding to the noise loss meeting the set condition as the geometric parameter of the target acoustic liner.
Example two
Fig. 5 is a schematic structural diagram of an acoustic liner designing apparatus according to a second embodiment of the present invention. As shown in fig. 5, the apparatus includes: a sample value selection module 210, an acoustic impedance value acquisition module 220, an acoustic propagation grid acquisition module 230, a sound pressure determination module 240, a noise loss determination module 250, a next generation sample value generation module 260, and a target acoustic liner geometric parameter determination module 270.
A sample value selection module 210, configured to select a sample value of the acoustic liner geometric parameter according to a value range and a sampling interval of the acoustic liner geometric parameter;
the acoustic impedance value obtaining module 220 is configured to input the sample value into a set acoustic impedance model to obtain an acoustic impedance value;
the acoustic propagation grid obtaining module 230 is configured to perform parametric modeling on the inner and outer profiles of the nacelle including the acoustic liner to obtain an acoustic propagation grid;
a sound pressure determination module 240 for determining the sound pressure of each monitoring point based on the acoustic propagation grid and the acoustic impedance value; wherein the sound pressure is the sound pressure under the condition of the sound liner;
a noise loss determining module 250, configured to determine noise loss based on the sound pressure of each monitoring point, and determine whether the noise loss meets a set condition;
a next-generation sample value generation module 260, configured to generate a sample value of the next-generation acoustic liner geometric parameter when the noise loss does not meet the set condition, and return to perform an operation of inputting the sample value into the set acoustic impedance model to obtain an acoustic impedance value until the noise loss meets the set condition;
and a target acoustic liner geometric parameter determining module 270, configured to determine, as the target acoustic liner geometric parameter, a sample value corresponding to the noise loss that meets the set condition.
Optionally, the acoustic liner geometric parameters include perforated plate hole diameter, thickness, perforation rate, and honeycomb core thickness.
Optionally, the sample value is input into a set acoustic impedance model to obtain an acoustic impedance value, and the acoustic impedance value is calculated according to the following formula:
Z＝Ro+Rof+SrVp+Rcm+i[Xm+SmVp+Xem-cot(kh)]，
wherein R iso+Rof＝real(iω(t+εrd)/cσ/F(ksr))，
Xm+Xem＝imaginary(iω(t+εrd)/cσ/F(ksr)), Z is an acoustic impedance; roAnd RofLinear dimensionless acoustic resistances independent and dependent on frequency, respectively; xmAnd XemDimensionless mass acoustic reactance and end correction (including flow effects), respectively; srIs the nonlinear acoustic resistance change slope; smThe slope of the change of the nonlinear mass acoustic reactance; vpRMS value of the acoustic particle velocity in the full frequency range; rcmDimensionless acoustic resistance induced for tangential flow; c is the atmospheric sound velocity; k is the free space wavenumber; omega is the circular frequency; r is the hole radius; epsilonrAnd εxFor the real and imaginary parts of ε, for calculating the effective mass end correction ε d, F (k)sr) velocity profile, k, representing the mean cross section of the microporessThe number of viscous stokes, t the thickness, h the honeycomb core thickness, σ the perforation rate, and d the perforation hole diameter of the perforated plate.
Optionally, the acoustic propagation grid obtaining module 230 is further configured to:
obtaining a coordinate point of inner and outer profile parameterization of the nacelle containing the acoustic liner;
modeling of the inner and outer molded surfaces of the nacelle is carried out based on the coordinate points, and a sound propagation grid is obtained.
Optionally, the sound pressure determining module 240 is further configured to:
and establishing an acoustic propagation calculation model based on the acoustic propagation grids and the acoustic impedance values, and performing acoustic propagation calculation including an acoustic liner effect to obtain the sound pressure of each monitoring point.
Optionally, determining the noise loss based on the sound pressure of each monitoring point is calculated according to the following formula:
Figure BDA0002753403900000101
wherein Δ PWL is the noise loss; theta far field measurement point polar angle; theta1The lower limit of the polar angle of a far-field measuring point; theta2The upper limit of polar angle of far-field measuring point; p is a radical ofHSound pressure of the monitoring point in the case of a silent lining; p is a radical ofLSound pressure of the monitoring point in the presence of the acoustic liner.
Optionally, the sound pressure of the monitoring point under the condition of no sound lining is determined in the following manner:
and performing sound transmission calculation in a solid wall state based on the sound transmission grid to obtain the sound pressure of each monitoring point under the condition of no sound lining.
The device can execute the methods provided by all the embodiments of the invention, and has corresponding functional modules and beneficial effects for executing the methods. For details not described in detail in this embodiment, reference may be made to the methods provided in all the foregoing embodiments of the present invention.
EXAMPLE III
Fig. 6 is a schematic structural diagram of a computer device according to a third embodiment of the present invention. FIG. 6 illustrates a block diagram of a computer device 312 suitable for use in implementing embodiments of the present invention. The computer device 312 shown in FIG. 6 is only an example and should not bring any limitations to the functionality or scope of use of embodiments of the present invention. Device 312 is a computing device that typically functions as an acoustic liner design.
As shown in FIG. 6, computer device 312 is in the form of a general purpose computing device. The components of computer device 312 may include, but are not limited to: one or more processors 316, a storage device 328, and a bus 318 that couples the various system components including the storage device 328 and the processors 316.
Bus 318 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, an enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.
Computer device 312 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by computer device 312 and includes both volatile and nonvolatile media, removable and non-removable media.
Storage 328 may include computer system readable media in the form of volatile Memory, such as Random Access Memory (RAM) 330 and/or cache Memory 332. The computer device 312 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 334 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 6, and commonly referred to as a "hard drive"). Although not shown in FIG. 6, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a Compact disk-Read Only Memory (CD-ROM), a Digital Video disk (DVD-ROM), or other optical media) may be provided. In these cases, each drive may be connected to bus 318 by one or more data media interfaces. Storage 328 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
Program 336 having a set (at least one) of program modules 326 may be stored, for example, in storage 328, such program modules 326 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which may comprise an implementation of a network environment, or some combination thereof. Program modules 326 generally carry out the functions and/or methodologies of embodiments of the invention as described herein.
The computer device 312 may also communicate with one or more external devices 314 (e.g., keyboard, pointing device, camera, display 324, etc.), with one or more devices that enable a user to interact with the computer device 312, and/or with any devices (e.g., network card, modem, etc.) that enable the computer device 312 to communicate with one or more other computing devices. Such communication may occur via input/output (I/O) interfaces 322. Also, computer device 312 may communicate with one or more networks (e.g., a Local Area Network (LAN), Wide Area Network (WAN), etc.) and/or a public Network, such as the internet, via Network adapter 320. As shown, network adapter 320 communicates with the other modules of computer device 312 via bus 318. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the computer device 312, including but not limited to: microcode, device drivers, Redundant processing units, external disk drive Arrays, disk array (RAID) systems, tape drives, and data backup storage systems, to name a few.
Processor 316 executes programs stored in memory 328 to perform various functional applications and data processing, such as implementing the acoustic liner design methodology provided by the above-described embodiments of the present invention.
Example four
Embodiments of the present invention provide a computer-readable storage medium having stored thereon a computer program, which when executed by a processing apparatus, implements a sound liner design method as in embodiments of the present invention. The computer readable medium of the present invention described above may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may comprise a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.
In some embodiments, the clients, servers may communicate using any currently known or future developed network Protocol, such as HTTP (HyperText Transfer Protocol), and may interconnect with any form or medium of digital data communication (e.g., a communications network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), the Internet (e.g., the Internet), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future developed network.
The computer readable medium may be embodied in the electronic device; or may exist separately without being assembled into the electronic device.
The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: selecting sample values of the acoustic liner geometric parameters according to the value range and the sampling interval of the acoustic liner geometric parameters; inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value; carrying out parametric modeling on the inner and outer molded surfaces of the nacelle containing the sound liner to obtain a sound transmission grid; determining sound pressure of each monitoring point based on the sound propagation grid and the acoustic impedance value; wherein the sound pressure is the sound pressure under the condition of the sound liner; determining noise loss based on the sound pressure of each monitoring point, and judging whether the noise loss meets a set condition; if the noise loss meets the set condition, generating a sample value of the next generation of acoustic liner geometric parameters, and returning to execute the operation of inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value until the noise loss meets the set condition; and determining the sample value corresponding to the noise loss meeting the set condition as the geometric parameter of the target sound liner.
Computer program code for carrying out operations for the present disclosure may be written in any combination of one or more programming languages, including but not limited to an object oriented programming language such as Java, Smalltalk, C + +, Python, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present disclosure may be implemented by software or hardware. Where the name of an element does not in some cases constitute a limitation on the element itself.
The functions described herein above may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), systems on a chip (SOCs), Complex Programmable Logic Devices (CPLDs), and the like.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A method of acoustic liner design, comprising:
selecting sample values of the acoustic liner geometric parameters according to the value range and the sampling interval of the acoustic liner geometric parameters;
inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value;
carrying out parametric modeling on the inner and outer molded surfaces of the nacelle containing the sound liner to obtain a sound transmission grid;
determining sound pressure of each monitoring point based on the sound propagation grid and the acoustic impedance value; wherein the sound pressure is the sound pressure under the condition of the sound liner;
determining noise loss based on the sound pressure of each monitoring point, and judging whether the noise loss meets a set condition;
if the noise loss meets the set condition, generating a sample value of the next generation of acoustic liner geometric parameters, and returning to execute the operation of inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value until the noise loss meets the set condition;
and determining the sample value corresponding to the noise loss meeting the set condition as the geometric parameter of the target sound liner.
2. The method of claim 1, wherein the acoustic liner geometric parameters include perforated plate hole diameter, thickness, perforation rate, and honeycomb core thickness.
3. The method of claim 2, wherein the sample values are input into a set acoustic impedance model to obtain acoustic impedance values, which are calculated according to the following formula:
Z＝Ro+Rof+SrVp+Rcm+i[Xm+SmVp+Xem-cot(kh)]，
wherein R iso+Rof＝real(iω(t+εrd)/cσ/F(ksr))，Xm+Xem＝imaginary(iω(t+εrd)/cσ/F(ksr)), Z is an acoustic impedance; roAnd RofLinear dimensionless acoustic resistances independent and dependent on frequency, respectively; xmAnd XemDimensionless mass acoustic reactance and end correction (including flow effects), respectively; srIs the nonlinear acoustic resistance change slope; smIs made acoustically resistant to non-linear massChanging the slope; vpRMS value of the acoustic particle velocity in the full frequency range; rcmDimensionless acoustic resistance induced for tangential flow; c is the atmospheric sound velocity; k is the free space wavenumber; omega is the circular frequency; r is the hole radius; epsilonrAnd εxFor the real and imaginary parts of ε, for calculating the effective mass end correction ε d, F (k)sr) velocity profile, k, representing the mean cross section of the microporessThe number of viscous stokes, t the thickness, h the honeycomb core thickness, σ the perforation rate, and d the perforation hole diameter of the perforated plate.
4. The method of claim 1, wherein parametrically modeling the nacelle inner and outer profiles containing the acoustic liner to obtain an acoustic propagation mesh comprises:
obtaining a coordinate point of inner and outer profile parameterization of the nacelle containing the acoustic liner;
modeling inner and outer molded surfaces of the nacelle based on the coordinate points to obtain an acoustic propagation grid.
5. The method of claim 1, wherein determining the sound pressure for each monitoring point based on the acoustic propagation grid and the acoustic impedance value comprises:
and establishing an acoustic propagation calculation model based on the acoustic propagation grid and the acoustic impedance value, and performing acoustic propagation calculation including an acoustic liner effect to obtain the sound pressure of each monitoring point.
6. The method of claim 5, wherein determining the noise loss based on the sound pressure of the monitoring points is calculated according to the following equation:
Figure FDA0002753403890000021
wherein Δ PWL is the noise loss; theta far field measurement point polar angle; theta1The lower limit of the polar angle of a far-field measuring point; theta2The upper limit of polar angle of far-field measuring point; p is a radical ofHSound pressure of the monitoring point in the case of a silent lining; p is a radical ofLSound pressure of the monitoring point in the presence of the acoustic liner.
7. The method of claim 6, wherein the sound pressure at the monitoring point in the case of a silent liner is determined by:
and performing sound transmission calculation in a solid wall state based on the sound transmission grid to obtain the sound pressure of each monitoring point under the condition of no sound lining.
8. An acoustic liner design apparatus, comprising:
the sample value selection module is used for selecting the sample value of the acoustic liner geometric parameter according to the value range and the sampling interval of the acoustic liner geometric parameter;
the acoustic impedance value acquisition module is used for inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value;
the sound propagation grid acquisition module is used for carrying out parametric modeling on the inner and outer molded surfaces of the nacelle containing the sound liner to obtain a sound propagation grid;
a sound pressure determination module for determining the sound pressure of each monitoring point based on the acoustic propagation grid and the acoustic impedance value; wherein the sound pressure is the sound pressure under the condition of the sound liner;
the noise loss determining module is used for determining noise loss based on the sound pressure of each monitoring point and judging whether the noise loss meets a set condition;
the next generation sample value generation module is used for generating a sample value of the next generation acoustic liner geometric parameter when the noise loss does not meet the set condition, and returning to execute the operation of inputting the sample value into a set acoustic impedance model to obtain an acoustic impedance value until the noise loss meets the set condition;
and the target acoustic liner geometric parameter determining module is used for determining the sample values corresponding to the noise loss meeting the set conditions as the target acoustic liner geometric parameters.
9. A computer device, the device comprising: comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of sound liner design according to any one of claims 1-7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processing device, carries out a sound liner design method as set forth in any one of claims 1-7.
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