CN217765230U - Test device for measuring flow-induced structure noise - Google Patents
Test device for measuring flow-induced structure noise Download PDFInfo
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- CN217765230U CN217765230U CN202222111932.6U CN202222111932U CN217765230U CN 217765230 U CN217765230 U CN 217765230U CN 202222111932 U CN202222111932 U CN 202222111932U CN 217765230 U CN217765230 U CN 217765230U
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Abstract
The utility model relates to an acoustics measures technical field, concretely relates to a test device for measuring flow excited structure noise. The test device comprises a test piece and a pressure plate. The interior of the test piece is hollow. A pressure sensor for measuring pulsating pressure is arranged in a first mounting hole on a shell of the test piece, and an acceleration sensor for measuring vibration of the test piece is arranged in a second mounting hole. The top of the test piece has a connection. The bottom of the pressure plate is provided with a first sealing step. The first sealing step is provided with a mounting groove. The connecting part is embedded in the mounting groove and is fixedly mounted on the pressure plate through a fastener. The middle part of the mounting groove is provided with a through hole. According to the device, the pressure sensor and the acceleration sensor are mounted on the test piece, so that the acquisition of wall surface pressure signals of the test piece and acceleration signals of shell structure vibration is realized, and the reliability of a numerical result obtained in the flow-induced structure simulation method is favorably verified.
Description
Technical Field
The utility model relates to an acoustics measures technical field, concretely relates to a test device for measuring flow excited structure noise.
Background
When the underwater vehicle sails underwater, a moving ship passes through an unstable flow field to form coupled vibration of a local structure and surrounding fluids, and the flow induced noise generated by pressure change caused by vibration is the most effective energy form capable of being remotely transmitted in water, so that the flow induced noise can seriously influence the concealment performance of the underwater vehicle. Therefore, exploring the mechanism of generating and transmitting the underwater vibration and the flow-induced noise of the ship and the radiation rule thereof has important practical significance for improving the stealth capability of the underwater vehicle.
At present, in the design process of an underwater vehicle, the acoustic performance of the underwater vehicle is estimated by using a numerical calculation method generally, so that the flow excitation noise of the underwater vehicle is reduced, and the concealment of the underwater vehicle is improved. The acoustic problem of the underwater vehicle in the structural design is found in advance, and the workload of repeated design verification of the underwater vehicle structure is reduced.
For example, CFD software is used to simulate and calculate the wall pressure of the underwater vehicle, LMS visual. Lab Acoustics template in the acoustic finite element software is used to obtain the vibration acceleration of the flow-induced structure, FEM-AML method is used to calculate the low-frequency flow-induced noise, and statistical energy method is used to calculate the medium-high frequency flow-induced noise. However, the reliability of the results obtained by the numerical calculation method described above needs further verification.
In summary, how to design a test device in the process of researching the noise of the flow-induced structure of the underwater vehicle is convenient to collect the parameters of the flow-induced structure under the test working condition so as to further verify the reliability of the numerical result obtained in the simulation method becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
An object of the utility model is to provide a test device for the in-process of the structure noise of streaming of the research underwater vehicle body for be convenient for gather the wall pressure and the vibration acceleration of streaming structure, and then verify the reliability of the numerical result that obtains in the simulation method.
In order to achieve the above purpose, the utility model adopts the following scheme: the test device for measuring the noise of the flow excited structure comprises a test piece and a pressure plate;
the interior of the test piece is hollow, a mounting hole is formed in the shell of the test piece and comprises a first mounting hole and a second mounting hole, a pressure sensor for measuring pulsating pressure is arranged in the first mounting hole, an acceleration sensor for measuring vibration of the test piece is arranged in the second mounting hole, and a connecting part is arranged at the top of the test piece;
the bottom of clamp plate has first sealed step, be provided with the mounting groove on the first sealed step, connecting portion gomphosis is in the mounting groove to through fastener fixed mounting on the clamp plate, the middle part of mounting groove is provided with the through-hole.
As preferred, the testpieces include first section, middle section and end section, and first section, middle section and end are connected gradually, are provided with the shrink section between middle section and the end section, and the shrink direction of shrink section is from the directional end section of middle section, and the first section and the end section of testpieces are the hemisphere, and the middle section is cylindrical structure, and the shrink section is the circular truncated cone structure. So set up, the test piece can simulate underwater vehicle's structure better. The underwater vehicle usually adopts a conical shell form, namely, the bow part is a semi-sphere, the middle part is a parallel cylindrical structure, and the stern part is contracted into a similar conical shell structure. By measuring the flow induced noise condition of the conical shell structure test piece, the acoustic performance of the underwater vehicle can be estimated better, improved parameters with reference value can be provided for further reducing the flow induced noise of the underwater vehicle, and the concealment of the underwater vehicle can be improved.
Preferably, the first mounting hole and the second mounting hole are symmetrically distributed along the central axis of the test piece, so that when the test piece is impacted by water flow, a pressure signal is measured at one side of the first mounting hole, and a vibration acceleration signal is measured at one side of the second mounting hole. The axes of the first mounting hole and the second mounting hole point to the central axis of the test piece. The arrangement is favorable for the tangency of the detection end surface of the sensor and the outer side surface of the shell of the test piece, so that the measured pressure signal and the measured vibration acceleration signal are more in line with actual values, the measurement error is further reduced, and the reliability of the numerical calculation result is favorably verified.
Preferably, a first thread is arranged in the first mounting hole, the pressure sensor is fixedly mounted on the test piece through the first thread, the detection surface of the pressure sensor is flush with the outer surface of the shell of the test piece, a first sealing structure is arranged at the position of the first mounting hole, a second thread is arranged in the second mounting hole, the acceleration sensor is fixedly mounted on the test piece through the second thread, the detection surface of the acceleration sensor is flush with the outer surface of the shell of the test piece, and a second sealing structure is arranged at the position of the second mounting hole.
The arrangement of the first threads and the second threads facilitates the installation and the disassembly of the pressure sensor and the acceleration sensor. The waterproof performance of the test piece is further improved due to the arrangement of the first sealing structure and the second sealing structure, so that the test device can simulate more extreme test conditions, such as higher water pressure or higher flow velocity, and the boundary range of the test device for verifying the numerical calculation result is favorably expanded.
Preferably, the top of the pressing plate is provided with a groove, and the bottom of the groove is provided with a test piece mounting hole. So set up, the connecting piece of the clamp plate of being convenient for and test piece passes through the fastener and links to each other, and the tip of fastener is located the recess, has avoided drilling the counter sink at the top of clamp plate, has simplified the processing technology flow of clamp plate, has reduced the manufacturing cost of clamp plate.
Preferably, the pressure plate is provided with pressure plate mounting holes which are arranged at equal intervals along the edge of the pressure plate. So set up, when placing the test piece in the seal box of test water hole, the test piece passes through clamp plate fixed mounting in the seal box, has avoided the direct contact of test piece with the seal box, is favorable to improving measuring signal's reliability, has guaranteed the joint strength of clamp plate and seal box simultaneously.
Preferably, the top of the pressing plate is provided with hoisting holes, and a pair of hoisting holes is arranged along the length direction of the pressing plate. So set up, the installation and the transport of the test device of being convenient for, a pair of hole for hoist is favorable to further keeping stability in installation and the handling.
Preferably, the top of the connecting part is provided with a second sealing step, and a sealing gasket is arranged on the second sealing step. So set up, further improved the water tightness of test piece in the seal box.
The utility model provides a pair of a test device for measuring flow induced structure noise compares with prior art, has following substantive characteristics and progress:
1. according to the test device for measuring the flow-induced structure noise, the pressure sensor and the acceleration sensor are respectively arranged in the first mounting hole and the second mounting hole on the test piece, so that when the test piece is impacted by fluid, a wall surface pressure signal of the test piece and an acceleration signal of shell structure vibration are acquired, reference is provided for analyzing the characteristics of the flow-induced structure noise, and the reliability of a numerical result obtained in a flow-induced structure simulation method is verified;
2. this a test device for measuring flow induced structure noise is with the test piece gomphosis in the bottom of clamp plate, through the clamp plate with test piece fixed mounting in the seal box, has reduced the installation degree of difficulty of test piece, has guaranteed the structural strength of test piece, is favorable to improving test device's water tightness.
Drawings
Fig. 1 is a schematic perspective view of a testing apparatus for measuring flow induced structure noise according to an embodiment of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a top view of FIG. 2;
FIG. 4 isbase:Sub>A cross-sectional view taken at A-A of FIG. 3;
FIG. 5 is a schematic perspective view of a test piece.
Reference numerals: the test piece comprises a test piece 1, a pressing plate 2, a first mounting hole 3, a pressing plate mounting hole 4, a groove 5, a connecting portion 6, a hoisting hole 7, a first sealing step 8, a second mounting hole 9 and a second sealing step 10.
Detailed Description
The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
The test device for measuring the noise of the flow-induced structure shown in fig. 1 to 5 is used for conveniently collecting the wall pressure and the vibration acceleration of the flow-induced structure, and further verifying the reliability of a numerical result obtained in a simulation method. According to the test device, the pressure sensor and the acceleration sensor are respectively installed in the first installation hole and the second installation hole in the test piece, so that when the test piece is impacted by fluid, the collection of wall surface pressure signals of the test piece and acceleration signals of shell structure vibration is realized, and reference is provided for analyzing the characteristics of flow-induced structure noise.
As shown in fig. 1 in conjunction with fig. 4, a test apparatus for measuring noise of a flow-induced structure includes a test piece 1 and a pressure plate 2. The test piece 1 was hollow inside. The shell of the test piece 1 is provided with a mounting hole. The mounting holes include a first mounting hole 3 and a second mounting hole 9. A pressure sensor for measuring pulsating pressure is arranged in the first mounting hole 3. An acceleration sensor for measuring the vibration of the test piece 1 is arranged in the second mounting hole 9. The top of the test piece 1 has a connection 6.
As shown in fig. 4, the bottom of the pressure plate 2 has a first sealing step 8, the first sealing step 8 is provided with a mounting groove, the connecting portion 6 is embedded in the mounting groove and fixedly mounted on the pressure plate 2 by a fastener, and the middle of the mounting groove is provided with a through hole.
The cables of the pressure sensor and the acceleration sensor which are arranged in the test piece 1 penetrate out of the through hole in the middle of the mounting groove, so that the flat cable and the signal transmission are facilitated. With the gomphosis of test 1 in the bottom of clamp plate 2, through clamp plate 2 with test 1 fixed mounting in the seal box, reduced the installation degree of difficulty of test, guaranteed the structural strength of test, be favorable to improving test device's water proofness.
As shown in fig. 2, the test piece 1 includes a first section, a middle section, and a tail section. The first section, the middle section and the tail end are connected in sequence. A contraction section is arranged between the middle section and the tail section. The contraction direction of the contraction section is from the middle section to the tail section. The first and last sections of the test piece 1 are hemispherical. The middle section is a cylindrical structure. The contraction section is in a cone frustum structure. So set up, test piece 1 can simulate underwater vehicle's structure better. The underwater vehicle usually adopts a conical shell form, namely, the bow part is a semicircle, the middle part is a parallel cylindrical structure, and the stern part is contracted into a similar conical shell structure. By measuring the flow induced noise condition of the conical shell structure test piece 1, the acoustic performance of the underwater vehicle can be estimated better, improved parameters with reference value can be provided for further reducing the flow induced noise of the underwater vehicle, and the concealment of the underwater vehicle can be improved.
First mounting hole 3 is the symmetric distribution with second mounting hole 9 along the axis of test 1, and when the test 1 of being convenient for received the rivers impact, pressure signal was measured to one side of first mounting hole 3, and vibration acceleration signal was measured to one side of second mounting hole 9. The axes of the first mounting hole 3 and the second mounting hole 9 point to the central axis of the test piece 1. Due to the arrangement, the detection end face of the sensor is tangent to the outer edge face of the shell of the test piece 1, so that the measured pressure signal and the measured vibration acceleration signal are more consistent with actual values, the measurement error is further reduced, and the reliability of a numerical calculation result is verified.
A first thread is arranged in the first mounting hole 3. The pressure sensor is fixedly arranged on the test piece 1 through a first thread. The detection surface of the pressure sensor is flush with the outer surface of the housing of the test piece 1. The first sealing structure is arranged at the first mounting hole 3. A second thread is arranged in the second mounting hole 9. And the acceleration sensor is fixedly arranged on the test piece 1 through a second thread. The detection surface of the acceleration sensor is flush with the outer surface of the housing of the test piece 1. And a second sealing structure is arranged at the second mounting hole 9.
The arrangement of the first threads and the second threads facilitates the installation and the disassembly of the pressure sensor and the acceleration sensor. The waterproof performance of the test piece 1 is further improved due to the arrangement of the first sealing structure and the second sealing structure, so that the test device can simulate more extreme test conditions, such as higher water pressure or higher flow velocity, and the boundary range of the test device for verifying the numerical calculation result is favorably expanded.
The pressure sensor is screwed into the test piece 1 in a threaded manner, and the sensor head of the pressure sensor is flush with the outer surface of the test piece 1. During installation, it should be noted that the threaded hole should mate with the pressure sensor threads to prevent damage to the sensor. Waterproof glue is coated on the thread to form a first sealing structure so as to prevent the gap from leaking water and damage tests. The first sealing structure can also be used for winding a raw material belt on the thread of the pressure sensor.
The acceleration sensor is directly fixed on the test piece 1 in a threaded screwing mode. In order to ensure that the acceleration sensor can better acquire data, the surface of the test piece 1 is cleaned before screwing, and the smoothness is ensured. The cables of the acceleration sensor should be bundled. Waterproof glue can be smeared at the thread part to form a second sealing structure so as to prevent water leakage from the gap. The second sealing structure can also be used for winding the thread of the acceleration sensor with a raw material belt.
Wherein, the pressure sensor can be a CY-YD-211 pressure sensor. The acceleration sensor can be an acceleration sensor of 602D11 model. The signals collected by the pressure sensor and the acceleration sensor are processed by a signal processor respectively to form sampling signals. The signal acquisition instrument collects the sampling signal and transmits the sampling signal to the host. The host computer records and analyzes the sampled signal.
As shown in fig. 4, the top of the pressure plate 2 is provided with a groove 5. The bottom of the groove 5 is provided with a mounting hole of the test piece 1. So set up, the connecting piece of clamp plate 2 and test piece 1 of being convenient for passes through the fastener and links to each other, and the tip of fastener is located recess 5, has avoided drilling the counter sink at the top of clamp plate 2, has simplified the processing technology flow of clamp plate 2, has reduced the manufacturing cost of clamp plate 2.
As shown in fig. 3, the pressure plate 2 is provided with a pressure plate mounting hole 4. The press plate mounting holes 4 are arranged at equal intervals along the edge of the press plate 2. So set up, when placing test 1 in the seal box of test water hole, test 1 passes through clamp plate 2 fixed mounting in the seal box, has avoided the direct contact of test 1 with the seal box, is favorable to improving measuring signal's reliability, has guaranteed the joint strength of clamp plate 2 with the seal box simultaneously.
As shown in fig. 3, the top of the pressing plate 2 is provided with a lifting hole 7. A pair of lifting holes 7 are arranged along the length direction of the pressure plate 2. So set up, the installation and the transport of the test device of being convenient for, a pair of hole for hoist 7 is favorable to further keeping stability in installation and the handling. The hoisting hole 7 can be a threaded hole. When the hoisting hole 7 is processed on the upper end face of the pressing plate 2, the processing of the datum plane is time-consuming and labor-consuming because the top of the pressing plate 2 is a large plane. The method can be used for reaming a small plane on the large plane and is used as a processing reference plane for processing the hoisting hole 7.
As shown in fig. 5, the top of the connection portion 6 has a second sealing step 10. A sealing gasket is provided on the second sealing step 10. So set up, the water tightness of test piece 1 in the seal box has further improved.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments can be provided in addition to the above embodiments. It should be understood by those skilled in the art that any modifications, equivalent substitutions, improvements and the like that are made within the spirit and principle of the present invention are within the scope of the present invention.
Claims (8)
1. A test device for measuring the noise of a flow-induced structure is characterized by comprising a test piece and a pressure plate;
the interior of the test piece is hollow, a mounting hole is formed in the shell of the test piece and comprises a first mounting hole and a second mounting hole, a pressure sensor for measuring pulsating pressure is arranged in the first mounting hole, an acceleration sensor for measuring vibration of the test piece is arranged in the second mounting hole, and a connecting part is arranged at the top of the test piece;
the bottom of clamp plate has first sealed step, be provided with the mounting groove on the first sealed step, connecting portion gomphosis is in the mounting groove to through fastener fixed mounting on the clamp plate, the middle part of mounting groove is provided with the through-hole.
2. The test device for measuring the flow-induced structure noise of claim 1, wherein the test piece comprises a first section, a middle section and a tail section, the first section, the middle section and the tail section are sequentially connected, a contraction section is arranged between the middle section and the tail section, the contraction direction of the contraction section points to the tail section from the middle section, the first section and the tail section of the test piece are both hemispherical, the middle section is of a cylindrical structure, and the contraction section is of a cone frustum structure.
3. The test device for measuring the noise of the flow-induced structure according to claim 1 or 2, wherein the first mounting hole and the second mounting hole are symmetrically distributed along the central axis of the test piece, and the axes of the first mounting hole and the second mounting hole point to the central axis of the test piece.
4. The test device for measuring the flow induced structure noise according to claim 1, wherein a first thread is arranged in the first mounting hole, the pressure sensor is fixedly mounted on the test piece through the first thread, the detection surface of the pressure sensor is flush with the outer surface of the shell of the test piece, a first sealing structure is arranged at the first mounting hole, a second thread is arranged in the second mounting hole, the acceleration sensor is fixedly mounted on the test piece through the second thread, the detection surface of the acceleration sensor is flush with the outer surface of the shell of the test piece, and a second sealing structure is arranged at the second mounting hole.
5. The test device for measuring the noise of the flow-induced structure as claimed in claim 1, wherein a groove is formed at the top of the pressure plate, and a test piece mounting hole is formed at the bottom of the groove.
6. The test device for measuring flow induced structure noise according to claim 1, wherein the pressure plate is provided with pressure plate mounting holes, and the pressure plate mounting holes are arranged at equal intervals along the edge of the pressure plate.
7. The test device for measuring the flow induced structure noise as claimed in claim 1, wherein the top of the pressure plate is provided with a hoisting hole, and a pair of hoisting holes are arranged along the length direction of the pressure plate.
8. The test device for measuring the noise of the flow-induced structure according to claim 1, wherein the top of the connecting part is provided with a second sealing step, and a sealing gasket is arranged on the second sealing step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222111932.6U CN217765230U (en) | 2022-08-11 | 2022-08-11 | Test device for measuring flow-induced structure noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222111932.6U CN217765230U (en) | 2022-08-11 | 2022-08-11 | Test device for measuring flow-induced structure noise |
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| Publication Number | Publication Date |
|---|---|
| CN217765230U true CN217765230U (en) | 2022-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222111932.6U Active CN217765230U (en) | 2022-08-11 | 2022-08-11 | Test device for measuring flow-induced structure noise |
Country Status (1)
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|---|---|
| CN (1) | CN217765230U (en) |
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2022
- 2022-08-11 CN CN202222111932.6U patent/CN217765230U/en active Active
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