Acoustic measurement supporting device and method of open type rotor power device

Abstract

The invention relates to the technical field of acoustic measurement, in particular to an acoustic measurement supporting device and method for an open type rotor power device, and aims to solve the problem of inaccurate measurement result caused by excessive extra noise generated by a supporting part of the open type rotor power device in the prior art. The acoustic measurement supporting device of the open type rotor power device comprises the open type rotor power device, the open type rotor power device comprises a rotating hub and a plurality of rotor blades, and each rotor blade is annularly arranged on the rotating hub; the annular supporting piece comprises a plurality of stator supporting blades and an annular pipeline, a hub of the annular pipeline extends out of the motor shaft to be rotationally connected with the rotating hub, and each stator supporting blade is annularly arranged on the outer side wall of the annular pipeline; the annular supporting piece is matched with the extension pipeline to offset noise modals generated by interference between the wake of the open type rotor power device and each stator supporting blade. The acoustic measurement supporting device and the acoustic measurement supporting method for the open type rotor power device are applied to the acoustic measurement supporting device.

Description

Technical Field

[0001] The present disclosure relates to the field of acoustic measurement technology, and in particular to an acoustic measurement support device and method for an open rotor power device. Background Art

[0002] With the rapid development of commercial drones, the noise generated by the open rotor propulsion systems of an increasing number of commercial drones is often unbearable. Therefore, an acoustic test bench is needed to accurately measure these noise levels. To ensure the accuracy of acoustic measurement results and far-field directivity, the test bench design places high demands on avoiding aerodynamic noise caused by velocity harmonics and shaft frequency noise caused by vibration.

[0003] Currently, open rotor power plant test benches are mostly supported by head and tail supports. The head support will cause intake distortion in the open rotor or propeller, which in turn affects its sound production and also has an adverse effect on the accuracy of acoustic measurements. The tail support adopts a cantilever method. To reduce interference noise, the axial distance between the support part and the open rotor power plant is increased, which will aggravate the overall vibration of the test bench and generate low-frequency shaft noise. To meet the vibration reduction requirements under long axial distances, the processing structure of the test bench support parts is extremely demanding, resulting in a significant increase in cost. Regardless of the support position, the signal-to-noise ratio of the test bench is low, and the accuracy of the measurement results is difficult to guarantee.

[0004] Therefore, how to solve the problem in the prior art of inaccurate measurement results caused by excessive additional noise generated by the support parts of the open rotor power device is one of the important issues that need to be solved urgently in this field. Summary of the Invention

[0005] In view of this, the embodiments of the present disclosure provide an acoustic measurement support device and method for an open rotor power device to solve the problem in the prior art of inaccurate measurement results caused by excessive additional noise generated by the support parts of the open rotor power device.

[0006] According to one aspect of the present disclosure, an acoustic measurement support device for an open rotor power device is provided. The acoustic measurement support device for the open rotor power device includes:

[0007] An open rotor power device includes a rotating hub and a plurality of rotor blades, each rotor blade being arranged in an annular manner on the rotating hub;

[0008] An annular support member, the annular support member includes a plurality of stator support blades and an annular pipe. The hub of the annular pipe extends out of the motor shaft and is rotatably connected to the rotating hub. Each stator support blade is annularly arranged on the outer wall of the annular pipe. The annular support member cooperates with the extended pipe to offset the noise mode generated by the interference between the wake of the open rotor power device and each stator support blade;

[0009] An extension pipe is fixedly connected to the annular support member and is used to provide an acoustic attenuation length;

[0010] Base fixings for supporting the ring support and the extension pipe;

[0011] a first sound collecting unit, the first sound collecting unit comprising a plurality of first sound collecting members, each of which is arranged in a ring on the inner wall of the extension pipe and is used to monitor the attenuation of the noise mode;

[0012] The data acquisition and processing unit is signal-connected to the first sound acquisition unit and is used to process the acoustic data acquired by the first sound acquisition unit.

[0013] In addition, according to an aspect of the acoustic measurement support device of the present disclosure, the acoustic measurement support device also includes a second sound collection unit, the second sound collection unit includes a second sound collection component, the second sound collection component is arranged at a position facing away from the separated rotor power device, and is fixedly connected to the base fixing component.

[0014] According to the acoustic measurement support device of one aspect of the present disclosure, the geometric center of the rotating hub, the geometric center of the annular pipe, and the geometric center of the extended pipe are all located on the same central axis.

[0015] According to the acoustic measurement support device of one aspect of the present disclosure, the axial dimension of the annular pipe is greater than half of the radial dimension of the annular pipe.

[0016] According to the acoustic measurement support device of one aspect of the present disclosure, the outlet end of the extended pipe is in a bell-mouth shape, so as to reduce the influence of acoustic scattering on far-field measurement.

[0017] According to an aspect of the acoustic measurement support device of the present disclosure, the acoustic measurement support device further includes a driving unit, which is fixed on the annular support member and is used to drive the open rotor power device to rotate.

[0018] According to the acoustic measurement support device according to one aspect of the present disclosure, the open rotor power device further includes a connecting member, and the open rotor power device is connected to the driving unit through the connecting member.

[0019] According to another aspect of the present disclosure, there is also provided an acoustic measurement support method for an open rotor power device, which is applied to the above-mentioned acoustic measurement support device. The acoustic measurement support method includes:

[0020] The acoustic circumferential modal relationship of the open rotor power plant is constructed based on the physical parameters of the rotor blades and the physical parameters of the stator support blades.

[0021] Solve the modal parameters under different modes based on the acoustic circumferential modal relationship;

[0022] When the modal parameters satisfy the condition that the circumferential mode is in a cutoff state, monitoring the attenuation of the noise mode through each first sound collecting element;

[0023] Adjusting the extension of the pipe based on the noise mode monitored by the first sound collecting component until the modal parameters meet the condition that the circumferential mode is in a cutoff state;

[0024] The data collection processing unit processes the acoustic data collected by the first sound collection unit.

[0025] According to an acoustic measurement support method for an open rotor power plant according to one aspect of the present disclosure, constructing an acoustic circumferential modal relationship of the open rotor power plant based on physical parameters of the rotor blades and physical parameters of the stator support blades further includes:

[0026] The acoustic circumferential mode relationship is:

[0027] m = s1B1 - s2B2;

[0028] Where m represents the circumferential modal number, s1 represents the harmonic number of the rotor blades, s2 represents the harmonic number of the stator support blades, B1 represents the number of rotor blades, and B2 represents the number of stator support blades.

[0029] According to an acoustic measurement support method for an open rotor power device according to one aspect of the present disclosure, when the modal parameters satisfy that the circumferential mode is in a cutoff state, monitoring the attenuation of the noise mode through each first sound collecting element further includes:

[0030] The number of the first sound collecting components is greater than twice the number of circumferential modal orders to be solved.

[0031] At least one of the above-mentioned technical solutions adopted in the embodiments of the present disclosure can achieve the following beneficial effects: In the above-mentioned acoustic measurement support device for an open rotor power device, the open rotor power device includes a rotating hub and a plurality of rotor blades, each rotor blade is annularly arranged on the rotating hub, the annular support member includes a plurality of stator support blades and an annular pipe, the hub of the annular pipe extends outward from the motor shaft and is rotatably connected to the rotating hub, each stator support blade is annularly arranged on the outer wall of the annular pipe, the annular support member cooperates with the extended pipe to offset the noise mode generated by the interference between the wake of the open rotor power device and each stator support blade, and the annular pipe is rotatably connected to the rotating hub. This connection method provides precise positioning and support for the rotating hub, ensuring that the rotating hub can rotate stably on a fixed axis, limiting the radial and axial displacement of the rotating hub during rotation, and achieving precise positioning and support for the split rotor power device. At the same time, the plurality of stator support blades are annularly arranged on the outer wall of the annular pipe, which not only offsets the noise mode but also further enhances the structural stability of the annular pipe, allowing the entire annular support member to more accurately support the open rotor power device and reduce position deviation caused by vibration or other external forces. Based on this, the extended pipe is fixedly connected to the annular support to provide an acoustic attenuation length. The annular support provides additional support to make the entire support structure more stable. At the same time, the structure of the extended pipe also helps to further limit the displacement of the open rotor power device in the axial and radial directions, ensuring the position accuracy of the open rotor power device during operation.

[0032] On this basis, the base fixture serves as the fundamental support for the entire device, primarily supporting the annular support member and the extension duct, thereby providing stable support for the open rotor power unit. The first sound collection unit comprises multiple first sound collection elements, each of which is arranged around the inner wall of the extension duct to monitor the attenuation of noise modes. The first sound collection unit is signal-connected to a data acquisition and processing unit, which processes the acoustic data collected by the first sound collection element. The multiple first sound collection elements within the first sound collection unit are arranged around the inner wall of the extension duct. This arrangement not only monitors the attenuation of noise modes but also embodies the concept of precise positioning support. By precisely positioning the sound collection elements in specific locations, acoustic information can be accurately acquired from specific areas surrounding the open rotor power unit. This means that the entire support device was designed with precise division and positioning of the space surrounding the open rotor power unit in mind, enabling more accurate measurement and analysis of noise characteristics. This addresses the existing problem of inaccurate measurement results due to inaccurate support placement for the open rotor power unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 FIG2 is a schematic structural diagram of an acoustic measurement support device for an open rotor power plant according to an embodiment of the present disclosure;

[0035] Figure 2 is a schematic cross-sectional view illustrating an acoustic measurement support device for an open rotor power plant according to an embodiment of the present disclosure;

[0036] Figure 3 The figure is a schematic flow chart illustrating a method for supporting acoustic measurement of an open rotor power device according to an embodiment of the present disclosure.

[0037] Reference numerals:

[0038] 1-open rotor power device, 11-rotor blade, 2-annular support, 3-extension pipe, 4-base fixing part, 5-data acquisition and processing unit, 6-first sound acquisition unit, 7-second sound acquisition unit, 8-drive unit. DETAILED DESCRIPTION

[0039] The following describes embodiments of the present disclosure in more detail with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0040] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0041] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0042] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0043] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0044] With the rapid development of commercial drones, the noise generated by the open rotor propulsion systems of an increasing number of commercial drones is often unbearable. Therefore, an acoustic test bench is needed to accurately measure these noise levels. To ensure the accuracy of acoustic measurement results and far-field directivity, the test bench design places high demands on avoiding aerodynamic noise caused by velocity harmonics and shaft frequency noise caused by vibration.

[0045] Currently, open rotor power plant test benches are mostly supported by head and tail supports. The head support will cause intake distortion in the open rotor or propeller, which in turn affects its sound production and also has an adverse effect on the accuracy of acoustic measurements. The tail support adopts a cantilever method. To reduce interference noise, the axial distance between the support part and the open rotor power plant is increased, which will aggravate the overall vibration of the test bench and generate low-frequency shaft noise. To meet the vibration reduction requirements under long axial distances, the processing structure of the test bench support parts is extremely demanding, resulting in a significant increase in cost. Regardless of the support position, the signal-to-noise ratio of the test bench is low, and the accuracy of the measurement results is difficult to guarantee.

[0046] In response to the above problems, exemplary embodiments of the present disclosure provide an acoustic measurement support device and method for an open rotor power device to solve the problem in the prior art of inaccurate measurement results caused by excessive additional noise generated by the support parts of the open rotor power device.

[0047] Figure 1 FIG2 is a schematic structural diagram of an acoustic measurement support device for an open rotor power plant according to an embodiment of the present disclosure. Figure 2FIG. 1 is a schematic cross-sectional view of an acoustic measurement support device for an open rotor power plant according to an embodiment of the present disclosure. Figure 1 - Figure 2 As shown, the acoustic measurement support device of the open rotor power device 1 includes: an open rotor power device 1, the open rotor power device 1 includes a rotating hub and a plurality of rotor blades 11, each rotor blade 11 is arranged in an annular manner on the rotating hub; an annular support member 2, the annular support member 2 includes a plurality of stator support blades and an annular pipe, the hub of the annular pipe extends out of the motor shaft and is rotatably connected to the rotating hub, each stator support blade is arranged in an annular manner on the outer wall of the annular pipe, and the annular support member 2 cooperates with the extension pipe 3 to offset the interference between the wake of the open rotor power device 1 and each stator support blade Generated noise mode; an extension pipe 3, the extension pipe 3 is fixedly connected to the annular support 2, and is used to provide an acoustic attenuation length; a base fixing member 4, used to support the annular support 2 and the extension pipe 3; a first sound collection unit 6, the first sound collection unit 6 includes a plurality of first sound collection members, each of which is arranged in a ring on the inner side wall of the extension pipe 3, and is used to monitor the attenuation of the noise mode; a data acquisition and processing unit 5, the first sound collection unit 6 is signal-connected to the data acquisition and processing unit 5, and is used to process the acoustic data collected by the first sound collection unit 6.

[0048] In practical applications, such as Figure 1 - Figure 2As shown, the open rotor power device 1 includes a rotating hub and a plurality of rotor blades 11, each rotor blade 11 is arranged in an annular manner on the rotating hub, the annular support member 2 includes a plurality of stator support blades and an annular pipe, the annular pipe is rotatably connected to the rotating hub, each stator support blade is arranged in an annular manner on the outer wall of the annular pipe, and the annular support member 2 is used to offset the noise mode generated by the interference between the wake of the open rotor power device 1 and each stator support blade, and the hub of the annular pipe extends out of the motor shaft and is rotatably connected to the rotating hub. This connection method provides precise positioning and support for the rotating hub, ensuring that the rotating hub can rotate stably on a fixed axis, limiting the radial and axial displacement of the rotating hub during rotation, and realizing precise positioning and support of the open rotor power device 1. At the same time, a plurality of stator support blades are arranged on the outer wall of the annular pipe. It can be understood that one end of each of the above-mentioned stator support blades is connected to the outer wall of the annular pipe, and the other end of each stator support blade is connected to the inner wall of the casing. This not only plays a role in offsetting the noise mode, but also further enhances the structural stability of the annular pipe, so that the entire annular support 2 can more accurately support the open rotor power device 1 and reduce the position offset caused by vibration or other external forces. Based on this, the extension pipe 3 is fixedly connected to the annular support 2 to provide an acoustic attenuation length. The annular support 2 provides additional support to make the entire support structure more stable. At the same time, the structure of the extension pipe 3 also helps to further limit the displacement of the open rotor power device 1 in the axial and radial directions, ensuring the position accuracy of the open rotor power device 1 during operation.

[0049] On this basis, the base fixture 4 serves as the fundamental support for the entire device. Its primary function is to support the annular support member 2 and the extension pipe 3, thereby providing stable support for the open rotor power unit 1. The first sound collection unit 6 comprises multiple first sound collection elements, each of which is arranged around the inner wall of the extension pipe 3 to monitor the attenuation of noise modes. The first sound collection unit 6 is signal-connected to the data acquisition and processing unit 5, which processes the acoustic data collected by the first sound collection unit 6. The multiple first sound collection elements in the first sound collection unit 6 are arranged around the inner wall of the extension pipe 3. This arrangement not only monitors the attenuation of noise modes but also, to a certain extent, embodies the concept of precise positioning support. By precisely positioning the sound collection elements in specific locations, acoustic information of specific areas around the open rotor power unit 1 can be accurately acquired. This means that the entire support device was designed with precise division and positioning of the space surrounding the open rotor power unit 1 in mind, enabling more accurate measurement and analysis of noise characteristics. This addresses the existing problem of inaccurate measurement results caused by inaccurate support placement of the open rotor power unit 1.

[0050] For example, Figure 1As shown, the acoustic measurement support device also includes a second sound collecting unit 7, which includes a second sound collecting component. The second sound collecting component is arranged at a position facing away from the open rotor power device 1. It can be understood that the above-mentioned second sound collecting component is used to collect far-field sounds of the open rotor power device 1 and is fixedly connected to the base fixing component 4.

[0051] For example, the geometric centers of the rotating hub, the annular conduit, and the extended conduit all lie on the same central axis, making the entire acoustic measurement support structure more stable. During operation, the open rotor power unit can better withstand various forces, including the torque generated by the rotating rotor and the impact of the airflow. This helps prevent deformation or damage to the unit due to uneven force, ensuring its normal operation and long-term reliability.

[0052] For example, the annular duct's axial dimension is greater than half its radial dimension. This larger axial dimension provides a longer path for noise propagation and interference, increasing the opportunity for noise modes generated by the interference between the tail of the open rotor power unit and the stator support blades to cancel each other out. In this process, noise waves of different frequencies and phases interact within a longer axial space, effectively reducing noise intensity and enhancing the annular support's ability to cancel out noise modes.

[0053] For example, the outlet of the extended pipe is shaped like a bell to reduce the impact of sound scattering on far-field measurements. The bell shape can change the propagation direction of sound emitted from the extended pipe. While a conventional straight-cylinder outlet tends to scatter sound in all directions, the outward-expanding bell structure guides sound propagation in a more concentrated direction, concentrating sound energy in the far field and reducing scattering losses in other directions, thereby improving the strength and clarity of the sound signal during far-field measurements.

[0054] For example, Figure 2 As shown, the acoustic measurement support device also includes a drive unit 8, which is fixed on the annular support 2. The drive unit 8 is used to drive the open rotor power device to rotate. The open rotor power device also includes a connecting member, and the open rotor power device is connected to the drive unit 8 via the connecting member.

[0055] Figure 3 FIG. 1 is a flow chart illustrating an acoustic measurement support method for an open rotor power device according to an embodiment of the present disclosure. Figure 3 As shown, an acoustic measurement support method for an open rotor power device is applied to the above-mentioned acoustic measurement support device, and the acoustic measurement support method includes:

[0056] S301: Constructing an acoustic circumferential modal relationship of the open rotor power device based on the physical parameters of the rotor blades and the physical parameters of the stator support blades.

[0057] S302: Solve the modal parameters under different modes based on the acoustic circumferential modal relationship.

[0058] S303: When the modal parameters satisfy the condition that the circumferential mode is in a cutoff state, monitoring the attenuation of the noise mode through each first sound collecting component.

[0059] S304: adjusting the extension pipe based on the noise mode monitored by the first sound collecting component until the modal parameters meet the condition that the circumferential mode is in a cutoff state.

[0060] S305: Processing the acoustic data collected by the first sound collection unit based on the data collection processing unit.

[0061] Exemplarily, the acoustic circumferential modal relationship of the open rotor power device constructed based on the physical parameters of the rotor blades and the physical parameters of the stator support blades also includes:

[0062] The acoustic circumferential mode relationship is:

[0063] m = s1B1 - s2B2;

[0064] Where m represents the circumferential modal number, s1 represents the harmonic number of the rotor blades, s2 represents the harmonic number of the stator support blades, B1 represents the number of rotor blades, and B2 represents the number of stator support blades.

[0065] In practical applications, B1 represents the number of rotor blades, B2 is the number of stator support blades, m is the circumferential mode number, Ω1 is the rotor speed, s1 is the rotor blade harmonic number, s2 is the stator support blade harmonic number, n is the radial mode number, Ma is the Mach number in the annular duct, c0 is the local sound speed, is the cutoff frequency of the annular support corresponding to the radial wave number, J m is the mth-order Bessel function of the first kind, Y m is the mth-order Bessel function of the second kind, κ mn is the modal eigenvalue of the pipeline, and the casing radius is r D , the hub radius is r H .

[0066] The number of circumferential modes that may propagate satisfies:

[0067] m=s1B1-s2B2

[0068] The number of possible circumferential modes m and k under different radial modes n mn satisfy:

[0069] J′m (κ mn r H )Y′ m (κ mn r D )-J′ m (κ mn r D )Y′ m (κ mn r H )=0

[0070] By solving different radial mode numbers n, we can get the order k mn The value of the corresponding cutoff frequency satisfy:

[0071]

[0072] For the same blade harmonic number s1, For the frequency of the same blade passing It is necessary to satisfy the requirement that all possible propagating circumferential modes are in the cutoff state, that is:

[0073]

[0074] The number of supporting stator blades B2 and casing radius r that meet the above requirements D It can be used as a ring pipe support.

[0075] Exemplarily, according to an aspect of the present disclosure, in an acoustic measurement support method for an open rotor power device, when the modal parameters satisfy that the circumferential mode is in a cutoff state, monitoring the attenuation of the noise mode through each first sound collecting component also includes: the number of first sound collecting components is greater than 2 times the order of the circumferential mode to be solved.

[0076] In practical applications, a second annular tube support is installed behind the front end or rear end of the first annular tube support, and a plurality of first sound collecting members are arranged circumferentially on the first annular tube support. The number of the first sound collecting members is determined based on the minimum number of possible propagating circumferential modes. It is also necessary to be able to use the inner circumferential modal decomposition of the annular tube to obtain the amplitude of the minimum number of possible propagating circumferential modes, so as to measure the interference noise attenuation of the open rotor power device in the annular tube. The point sound pressure of the annular tube can be superimposed by countless circumferential sound modes:

[0077]

[0078] According to Harry Nyquist's sampling theorem, in order to decompose and obtain the correct circumferential modal amplitude, the number of microphones used to measure the circumferential sound field information must be greater than twice the number of circumferential modal orders to be solved. By solving the overdetermined equations, the amplitude P of the minimum number of circumferential modes that can be propagated can be obtained. m Based on the amplitude, the length of the extended pipe section is selected. While ensuring that the interference noise of the open rotor power unit is completely attenuated, the axial distance between the support and the rotating plane is minimized as much as possible to reduce the vibration of the entire test bench, thereby reducing low-frequency shaft frequency noise.

[0079] The above descriptions are merely some embodiments of the present disclosure and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the present disclosure.

[0080] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An acoustic measurement support device for an open rotor power plant, characterized in that: The acoustic measurement support device of the open rotor power device includes: An open rotor power device, the open rotor power device comprising a rotating hub and a plurality of rotor blades, each of the rotor blades being arranged in an annular manner on the rotating hub; an annular support member, the annular support member including a plurality of stator support blades and an annular duct, the annular duct being rotatably connected to the rotating hub, each stator support blade being annularly disposed on an outer side wall of the annular duct, the annular support member cooperating with the extended duct to offset noise modes generated by interference between the wake of the open rotor power device and each stator support blade; an extension pipe, the extension pipe being fixedly connected to the annular support member and being used to provide an acoustic attenuation length; a base fixing member, used for supporting the annular support member and the extension pipe; a first sound collecting unit, the first sound collecting unit comprising a plurality of first sound collecting members, each of the first sound collecting members being arranged around the inner wall of the extension pipe and being used to monitor the attenuation of the noise mode; The data acquisition and processing unit is signal-connected to the first sound acquisition unit and is used to process the acoustic data acquired by the first sound acquisition unit.

2. The acoustic measurement support device for an open rotor power plant according to claim 1, characterized in that: The acoustic measurement support device further includes a second sound collecting unit, which includes a second sound collecting component. The second sound collecting component is located at a position away from the open rotor power device and is used to measure the directivity of the sound field.

3. The acoustic measurement support device for an open rotor power plant according to claim 1, characterized in that: The geometric center of the rotating hub, the geometric center of the annular pipe and the geometric center of the extension pipe are all located on the same central axis.

4. The acoustic measurement support device for an open rotor power plant according to claim 1, characterized in that: The axial dimension of the annular pipe is greater than half of the radial dimension of the annular pipe.

5. The acoustic measurement support device for an open rotor power plant according to claim 1, characterized in that: The outlet end of the extension pipe is in a bell-mouth shape, which is used to reduce the influence of sound scattering on far-field measurement.

6. The acoustic measurement support device for an open rotor power plant according to any one of claims 1 to 5, characterized in that: The acoustic measurement support device further includes a driving unit, which is fixed on the annular support member and is used to drive the open rotor power device to rotate.

7. The acoustic measurement support device for an open rotor power plant according to claim 6, characterized in that: The open rotor power device further includes a connecting member, and the open rotor power device is connected to the driving unit via the connecting member.

8. An acoustic measurement support method for an open rotor power device, applied to the acoustic measurement support device according to any one of claims 1 to 7, characterized in that: The acoustic measurement support method includes: The acoustic circumferential modal relationship of the open rotor power plant is constructed based on the physical parameters of the rotor blades and the physical parameters of the stator support blades. Solving the modal parameters under different modes based on the acoustic circumferential modal relationship; When the modal parameters satisfy the condition that the circumferential mode is in a cutoff state, monitoring the attenuation of the noise mode through each of the first sound collecting components; Adjusting the extension pipe based on the noise mode monitored by the first sound collecting component until the modal parameters satisfy the condition that the circumferential mode is in a cutoff state; The data collection processing unit processes the acoustic data collected by the first sound collection unit.

9. The acoustic measurement support method for an open rotor power device according to claim 8, characterized in that: The acoustic circumferential modal relationship of the open rotor power device constructed based on the physical parameters of the rotor blades and the physical parameters of the stator support blades also includes: The acoustic circumferential modal relationship is: m = s1B1 - s2B2; Where m represents the circumferential modal number, s1 represents the harmonic number of the rotor blades, s2 represents the harmonic number of the stator support blades, B1 represents the number of rotor blades, and B2 represents the number of stator support blades.

10. The acoustic measurement support method for an open rotor power device according to claim 8, characterized in that: When the modal parameters satisfy the condition that the circumferential mode is in a cutoff state, monitoring the attenuation of the noise mode through each of the first sound collecting components further includes: The number of the first sound collecting components is greater than twice the number of circumferential modal orders to be solved.

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