CN115524000A - Test bench for testing acoustic transmission characteristics of port of vane pump - Google Patents
Test bench for testing acoustic transmission characteristics of port of vane pump Download PDFInfo
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Abstract
The invention belongs to the technical field of experimental tools, and particularly discloses a test bed for testing acoustic transmission characteristics of a port of a vane pump. Only use a test pump and an auxiliary pump and relevant pipe-line system, through adjusting opening and close of the frequency conversion drive of auxiliary pump, the last water route governing valve II ~ XII of the aperture of flow control valve I on the auxiliary pump outlet pipeline and pipeline along the line, and the dismouting that need not test pump and auxiliary pump can accomplish different frequency department test pump port acoustics transmission characteristic experiment, has reduced work load, improvement work efficiency that can be very big.
Description
Technical Field
The invention belongs to the technical field of experimental tools, and particularly relates to a test bed for testing acoustic transmission characteristics of a port of a vane pump.
Background
The vane pump is used as core equipment for conveying fluid media in a waterway system, and has very important application in the fields of urban municipal administration, food medicine, chemical metallurgy, energy power, aviation and navigation and the like. In recent years, with the development of vane pumps in various fields toward high power, high rotation speed, high reliability and centralization, the research on the acoustic transmission characteristics of the ports of the vane pumps is of great practical significance as the most important noise source in a water path system. The existing test bed usually adopts hydrophones or pressure sensors to be installed on the wall surfaces of inlet and outlet pipelines of the vane pump, and acoustic transmission characteristics of a port of the vane pump are reflected by directly using sound pressure measured at a certain position of the inlet and outlet pipelines of the vane pump. But such directly measured acoustic pressures depend not only on the monitored location where the hydrophone or pressure sensor is installed, but also on the acoustic response of the piping system. That is, the measurement result may have a large difference depending on the system and the measurement position, and the port acoustic transmission characteristics of the vane pump itself cannot be directly reflected. Therefore, the existing test bed still has great limitation in testing the acoustic transmission characteristics of the vane pump port.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a test bed for testing the acoustic transmission characteristics of a port of a vane pump, which only uses one test pump and one auxiliary pump as a sound source, two flowmeters, two groups of piezoelectric pressure sensors and related pipeline systems, and is characterized in that the acoustic load generated by the auxiliary pump as an external sound source at different frequencies and different acoustic impedance of pipeline configuration are changed by adjusting the variable frequency drive of the auxiliary pump, the opening degree of a flow regulating valve I on an outlet pipeline of the auxiliary pump and the opening and closing of water path regulating valves II-XII on the pipeline along the pipeline, the acoustic pressure amplitudes of upper and lower monitoring points of the test pump at different frequencies under different external sound source acoustic loads and different acoustic impedances of the pipeline configuration are collected, the modeling and solving of test data are completed, the acoustic transmission characteristics of the port of the vane pump at different frequencies are obtained by tests, and the acoustic impedance of the test pump and the auxiliary pump are not required to be disassembled and assembled in the process.
In order to realize the purpose, the invention adopts the following technical scheme:
a test bed for testing acoustic transmission characteristics of a port of a vane pump comprises a test pump, an auxiliary pump serving as a sound source, a water tank, a flowmeter, a piezoelectric pressure sensor, a flow regulating valve I, water path regulating valves II-XII and related water path systems;
the auxiliary pump and the test pump are connected through a pipeline, and the auxiliary pump and the test pump are both connected with the water tank through pipelines to form a main loop of the waterway circulation system; flow meters are arranged on outlet pipelines of the auxiliary pump and the test pump;
the test bed can be divided into a monitoring system and an adjusting control system, the monitoring system consists of two groups of four piezoelectric pressure sensors which are respectively positioned on an inlet pipeline and an outlet pipeline of the test pump, and each group comprises two piezoelectric pressure sensors which are used for monitoring sound pressure signals at different frequencies, which are excited by the auxiliary pump, at the inlet pipeline and the outlet pipeline of the test pump; the adjusting control system comprises a first waterway adjusting valve group arranged between the auxiliary pump and the test pump, a flow adjusting valve I arranged on an outlet pipeline of the auxiliary pump, a second waterway adjusting valve group arranged between the test pump and the water tank and a waterway adjusting valve IX arranged on the outlet pipeline of the test pump; the adjusting control system adjusts an external sound source or external acoustic impedance received by the test pump; the first water path adjusting valve group comprises a water path adjusting valve IV, a water path adjusting valve V and a water path adjusting valve VI which are arranged in parallel, wherein a water path adjusting valve II and a water path adjusting valve VII are respectively connected in series on two sides of the water path adjusting valve IV and the water path adjusting valve V, and a water path adjusting valve III and a water path adjusting valve VIII are respectively connected in series on two sides of the water path adjusting valve V and the water path adjusting valve VI; the second water path adjusting valve group comprises a water path adjusting valve X, a water path adjusting valve XI and a water path adjusting valve XII which are arranged in parallel.
The adjusting step of the adjusting system comprises: adjusting the variable frequency drive of the auxiliary pump to change the rotating speed of the auxiliary pump, and further changing the amplitude and frequency of sound pressure of the sound source of the auxiliary pump; controlling the opening degree of a flow regulating valve I on an outlet pipeline of the auxiliary pump so as to change the sound pressure amplitude of the auxiliary pump as a sound source; and adjusting different water path adjusting valves II-XII on the branch pipeline between the test pump and the auxiliary pump to enable the pipeline to be provided with different acoustic impedances.
The waterway system also comprises loops I, II, III, IV, V, VI, VII, VIII, IX, X, XI and XII.
The loop I is opened by a flow regulating valve I, a water path regulating valve II, a water path regulating valve III, a water path regulating valve VI, a water path regulating valve IX and a water path regulating valve X, and the rest water path regulating valves are closed.
And the loop II is opened by a flow regulating valve I, a water path regulating valve II, a water path regulating valve V, a water path regulating valve VIII, a water path regulating valve IX and a water path regulating valve X, and other water path regulating valves are closed.
And the loop III is opened by a flow regulating valve I, a water path regulating valve IV, a water path regulating valve VII, a water path regulating valve VIII, a water path regulating valve IX and a water path regulating valve X, and the rest water path regulating valves are closed.
And the loop IV is opened by a flow regulating valve I, a water path regulating valve III, a water path regulating valve IV, a water path regulating valve V, a water path regulating valve VI, a water path regulating valve VII, a water path regulating valve IX and a water path regulating valve X, and the rest water path regulating valves are closed.
And the loop V is opened by the flow regulating valve I, the water path regulating valve II, the water path regulating valve III, the water path regulating valve VI, the water path regulating valve IX and the water path regulating valve XI, and the rest water path regulating valves are closed.
And the loop VI is opened by the flow regulating valve I, the water path regulating valve II, the water path regulating valve V, the water path regulating valve VIII, the water path regulating valve IX and the water path regulating valve XI, and the rest water path regulating valves are closed.
The loop VII is opened by a flow regulating valve I, a water path regulating valve IV, a water path regulating valve VII, a water path regulating valve VIII, a water path regulating valve IX and a water path regulating valve XI, and the rest water path regulating valves are closed.
And the loop VIII is opened by a flow regulating valve I, a water path regulating valve III, a water path regulating valve IV, a water path regulating valve V, a water path regulating valve VI, a water path regulating valve VII, a water path regulating valve IX and a water path regulating valve XI, and the rest water path regulating valves are closed.
And the loop IX is opened by a flow regulating valve I, a water path regulating valve II, a water path regulating valve III, a water path regulating valve VI, a water path regulating valve IX and a water path regulating valve XII, and the rest water path regulating valves are closed.
And the loop X is opened by a flow regulating valve I, a water path regulating valve II, a water path regulating valve V, a water path regulating valve VIII, a water path regulating valve IX and a water path regulating valve XII, and the rest water path regulating valves are closed.
And the loop XI is formed by opening a flow regulating valve I, a water path regulating valve IV, a water path regulating valve VII, a water path regulating valve VIII, a water path regulating valve IX and a water path regulating valve XII, and closing the rest water path regulating valves.
The return circuit XII is opened by a flow regulating valve I, a water path regulating valve III, a water path regulating valve IV, a water path regulating valve V, a water path regulating valve VI, a water path regulating valve VII, a water path regulating valve IX and a water path regulating valve XII, and the rest water path regulating valves are closed.
The water path system also comprises water path adjusting valves IX in the loops I, II, III, IV, V, VI, VII, VIII, IX, X, XI and XII which are closed, and the rest adjusting valves are kept unchanged.
The inlet pipeline and the outlet pipeline of the test pump are sequentially and respectively provided with two groups of four piezoelectric pressure sensors, the distance between each group of sensors at the inlet pipeline and the outlet pipeline is 10-20 times of the inner diameter of the pipeline, the smaller the inner diameter of the pipeline is, the larger the multiple value is, the larger the inner diameter of the pipeline is, and the smaller the multiple value is.
The beneficial effects of the invention are:
according to the test bed for testing the acoustic transmission characteristics of the port of the vane pump, the variable frequency drive of the auxiliary pump and the opening of the adjusting valve on the pipeline line are adjusted, the acoustic transmission characteristic test of the port of the vane pump at different frequencies can be completed only by using one test pump, one auxiliary pump as a sound source, two groups of piezoelectric pressure sensors and related pipeline systems, the workload is reduced, and the working efficiency and the test measurement accuracy can be greatly improved. In the process of testing the acoustic transmission characteristics of the port of the vane pump, the test bed can avoid the influence of environmental background noise and damping of the peripheral wall of the pump on indirect measurement, and in addition, the test bed can avoid the influence of obvious difference of measurement results caused by the acoustic characteristics of the vane pump along with different test systems and measurement positions in direct measurement. The test bed can directly reflect the acoustic characteristics of the vane pump, and provides a theoretical basis and a scientific basis for the research of the noise mechanism of the centrifugal pump, the verification of noise reduction measures and the design of low-noise products.
The invention has good effect through test verification.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
the schematic diagram is labeled as follows: in the figure, an oval dotted line frame A and an oval dotted line frame B represent regulating valve groups, and different acoustic impedances of the pipeline configuration are changed by regulating the opening and closing of the on-line waterway regulating valves II-XII of the pipeline;
1-auxiliary pump, 2-test pump, 3, 4-flowmeter, 5, 6-piezoelectric pressure sensor, 7-flow control valve I, 8-water way regulating valve II, 9-water way regulating valve III, 10-water way regulating valve IV, 11-water way regulating valve V, 12-water way regulating valve VI, 13-water way regulating valve VII, 14-water way regulating valve VIII, 15-water way regulating valve IX, 16-water way regulating valve X, 17-water way regulating valve XI, 18-water way regulating valve XII, 19-water tank.
Detailed Description
The specific implementation of the present invention will now be described with reference to fig. 1:
the test bed water path system comprises an auxiliary pump 1, a test pump 2, a flowmeter 3 (4), a flow regulating valve I7, water path regulating valves II-XII (8-18) and a water tank 19, wherein the auxiliary pump 1 and the test pump 2 are connected through a pipeline, and the auxiliary pump 1 and the test pump 2 are both connected with the water tank 19 through pipelines to form a main loop of the water path circulating system; the outlet pipelines of the auxiliary pump 1 and the test pump 2 are both provided with a flowmeter 3 and a flowmeter 4.
The test bed can be divided into a monitoring system and an adjusting control system. The monitoring system consists of two groups of four piezoelectric pressure sensors, wherein one group consists of two piezoelectric pressure sensors 5, and the other group consists of two piezoelectric pressure sensors 6, and is used for monitoring sound pressure signals at different frequencies, which are excited by the auxiliary pump 1, at the inlet and outlet pipelines of the test pump 2. The adjusting and controlling system is composed of three parts, wherein one part is a flow adjusting valve I7, the other part is composed of waterway adjusting valve groups II-VIII (8-14) in an oval dotted-line frame A in series and parallel connection, the third part is composed of a waterway adjusting valve IX 15 and waterway adjusting valve groups X-XII (16-18) in an oval dotted-line frame B in parallel connection, and the adjusting and controlling system adjusts and controls an external sound source or external acoustic impedance received by the test pump 2 by the following method: adjusting the variable frequency drive of the auxiliary pump 1 to change the rotating speed of the auxiliary pump, and further changing the sound pressure amplitude and frequency of the auxiliary pump 1 as a sound source; the opening degree of a flow regulating valve I7 on an outlet pipeline of the auxiliary pump 1 is controlled, namely the flow of the auxiliary pump 1 is regulated, and further the sound pressure amplitude of the auxiliary pump 1 as a sound source is changed; and adjusting different water path adjusting valves II-XII (8-18) on the branch pipeline between the test pump 2 and the auxiliary pump 1 to enable the pipeline to be provided with different acoustic impedances.
A flow regulating valve I7 is arranged on an outlet pipeline of the auxiliary pump 1, and a water path regulating valve IX 15 is arranged on an outlet pipeline of the test pump 2; between the auxiliary pump 1 and the test pump 2, the adjusting and controlling system comprises a flow adjusting valve I7 and a first waterway adjusting valve group in an oval dotted line frame A; between the test pump 2 and the water tank 19, the adjusting and controlling system comprises a water path adjusting valve IX 15 and a second water path adjusting valve set in an oval broken line frame B.
The first regulating valve group in the oval dotted line frame A is formed by connecting a waterway regulating valve II 8, a waterway regulating valve III 9, a waterway regulating valve IV 10, a waterway regulating valve V11, a waterway regulating valve VI 12, a waterway regulating valve VII 13 and a waterway regulating valve VIII 14 in series and in parallel. And a second water path adjusting valve group in the oval broken line frame B is formed by connecting a water path adjusting valve X16, a water path adjusting valve XI 17 and a water path adjusting valve XII 18 in parallel.
The waterway system also comprises loops I, II, III, IV, V, VI, VII, VIII, IX, X, XI and XII.
And the loop I is opened by a flow regulating valve I7, a water path regulating valve II 8, a water path regulating valve III 9, a water path regulating valve VI 12, a water path regulating valve IX 15 and a water path regulating valve X16, and the rest water path regulating valves are closed.
And the loop II is opened by a flow regulating valve I7, a water path regulating valve II 8, a water path regulating valve V11, a water path regulating valve VIII 14, a water path regulating valve IX 15 and a water path regulating valve X16, and the rest water path regulating valves are closed.
And the loop III is opened by a flow regulating valve I7, a water path regulating valve IV 10, a water path regulating valve VII 13, a water path regulating valve VIII 14, a water path regulating valve IX 15 and a water path regulating valve X16, and the rest water path regulating valves are closed.
And the loop IV is opened by a flow regulating valve I7, a water path regulating valve III 9, a water path regulating valve IV 10, a water path regulating valve V11, a water path regulating valve VI 12, a water path regulating valve VII 13, a water path regulating valve IX 15 and a water path regulating valve X16, and the rest water path regulating valves are closed.
The loop V is opened by a flow regulating valve I7, a water path regulating valve II 8, a water path regulating valve III 9, a water path regulating valve VI 12, a water path regulating valve IX 15 and a water path regulating valve XI 17, and the rest water path regulating valves are closed.
And the loop VI is opened by a flow regulating valve I7, a water path regulating valve II 8, a water path regulating valve V11, a water path regulating valve VIII 14, a water path regulating valve IX 15 and a water path regulating valve XI 17, and the rest water path regulating valves are closed.
The loop VII is opened by a flow regulating valve I7, a water path regulating valve IV 10, a water path regulating valve VII 13, a water path regulating valve VIII 14, a water path regulating valve IX 15 and a water path regulating valve XI 17, and the rest water path regulating valves are closed.
And the loop VIII is opened by a flow regulating valve I7, a water path regulating valve III 9, a water path regulating valve IV 10, a water path regulating valve V11, a water path regulating valve VI 12, a water path regulating valve VII 13, a water path regulating valve IX 15 and a water path regulating valve XI 17, and the rest water path regulating valves are closed.
And the loop IX is opened by a flow regulating valve I7, a water path regulating valve II 8, a water path regulating valve III 9, a water path regulating valve VI 12, a water path regulating valve IX 15 and a water path regulating valve XII 18, and the rest water path regulating valves are closed.
And a loop X is opened by a flow regulating valve I7, a water path regulating valve II 8, a water path regulating valve V11, a water path regulating valve VIII 14, a water path regulating valve IX 15 and a water path regulating valve XII 18, and the rest water path regulating valves are closed.
The loop XI is formed by opening a flow regulating valve I7, a water path regulating valve IV 10, a water path regulating valve VII 13, a water path regulating valve VIII 14, a water path regulating valve IX 15 and a water path regulating valve XII 18, and closing the rest water path regulating valves.
And the loop XII is opened by a flow regulating valve I7, a water path regulating valve III 9, a water path regulating valve IV 10, a water path regulating valve V11, a water path regulating valve VI 12, a water path regulating valve VII 13, a water path regulating valve IX 15 and a water path regulating valve XII 18, and the rest water path regulating valves are closed.
The water path system also comprises water path adjusting valves IX 15 which are used for closing the water paths in the loops I, II, III, IV, V, VI, VII, VIII, IX, X, XI and XII, and the rest adjusting valves are kept unchanged.
When the test bench carries out different frequency department vane pump port acoustics transmission characteristic experiment, under the condition that does not change the pipeline, can accomplish relevant experiment through the regulation of auxiliary pump 1 frequency conversion driven, the regulation of flow control valve I7 aperture and the mutual cooperation of different water route governing valves II 8 ~ XII 18 on the lateral conduit, explain below with regard to part concrete implementation process:
the first test procedure: during testing, the waterway system selects the loop I, the testing pump 2 is in a static state, the auxiliary pump 1 runs and is at a certain rotating speed, only the opening degree of the flow regulating valve I7 is adjusted, and then the sound source intensity of the sound source of the auxiliary pump 1 is changed, so that different sound pressure amplitude results measured by the piezoelectric pressure sensor group 5 and the piezoelectric pressure sensor group 6 on inlet and outlet pipelines of the testing pump 2 can be obtained when the auxiliary pump 1 runs as the sound source under different flow working conditions.
The second test procedure: referring to the first test process, the difference lies in that only the selection scheme of the waterway system loop during the test is changed, for example, the acoustic impedance of the waterway system outside the test pump 2 is changed, and other conditions are kept unchanged, so that different sound pressure amplitude results measured by the piezoelectric pressure sensor 5 and the piezoelectric pressure sensor 6 on the inlet pipeline and the outlet pipeline of the test pump 2 can be obtained when the auxiliary pump 1 operates as a sound source under different flow working conditions under each waterway system loop scheme.
The third test process: referring to the first test process, the difference is that the flow regulating valve i 7 maintains a certain opening degree at the time, the rotation speed of the auxiliary pump 1 is adjusted only by frequency conversion driving, and then the sound source intensity and the sound source frequency of the sound source of the auxiliary pump 1 are changed, so that different sound pressure amplitude results measured by the piezoelectric pressure sensor group 5 and the piezoelectric pressure sensor group 6 on the inlet and outlet pipelines of the test pump 2 can be obtained when the auxiliary pump 1 operates as the sound source at different speeds and different frequencies.
The fourth test procedure: similarly, the waterway regulating valves IX 15 in the loops I, II, III, IV, V, VI, VII, VIII, IX, X, XI and XII are closed, and the rest regulating valves are kept unchanged, so that the first test process, the second test process and the third test process are respectively completed.
And (3) calculating: according to the different sound pressure amplitudes measured by the piezoelectric pressure sensor 5 on the inlet pipeline of the test pump 2 in the first test process, the second test process, the third test process and the fourth test process, the following equations are listed:
Δl up ＝x 2 -x 1 (3)
wherein p is 1,up (x, t) and p 2up (x, t) respectively represent the sound pressure amplitudes respectively measured by two piezoelectric pressure sensors on the inlet pipeline of the test pump 2; and respectively representing the amplitude of plane sound pressure propagating along a positive direction and a negative direction in an inlet pipeline of the test pump 2 and the phase of the plane sound pressure, wherein the positive propagation refers to the propagation direction of the sound pressure wave pointing to the inlet direction of the pump, and the negative propagation refers to the propagation direction of the sound pressure wave back to the inlet direction of the pump; x is the number of 1 And x 2 The distances from two piezoelectric pressure sensors in the piezoelectric pressure sensor group 5 to the inlet end of the test pump 2 are respectively; represents the distance between two piezoelectric pressure sensors in the piezoelectric pressure sensor group 5; is an imaginary unit, ω =2 π f represents angular frequency, f represents frequency, represents wave number, is in a mediumThe speed of sound. Solving according to equations (1) - (3) to obtain:
similarly, the following equations are listed according to the different sound pressure amplitudes measured by the piezoelectric pressure sensor group 6 on the outlet pipe of the test pump 2 in the first test procedure, the second test procedure, the third test procedure and the fourth test procedure:
Δl down ＝x 4 -x 3 (8)
wherein p is 1,down (x, t) and p 2,down (x, t) respectively represent the sound pressure amplitudes respectively measured by two piezoelectric pressure sensors in the piezoelectric pressure sensor group 6 on the outlet pipeline of the test pump 2; and respectively representing the amplitude of plane sound pressure propagating along a positive direction and a negative direction in an outlet pipeline of the test pump 2 and the phase of the plane sound pressure, wherein the positive propagation refers to the direction of sound pressure wave propagation pointing to the outlet direction of the pump, and the negative propagation refers to the direction of sound pressure wave propagation back to the outlet direction of the pump; x is a radical of a fluorine atom 3 And x 4 The distances from two piezoelectric pressure sensors in the piezoelectric pressure sensor group 6 to the outlet end of the test pump 2 are respectively; indicating the distance between two piezoelectric pressure sensors in the group 6 of piezoelectric pressure sensors. Solving according to equations (6) to (8) to obtain:
n data sets obtained by solving equations (1) to (3) and (6) to (8)
And
the following set of equations is listed:
the overdetermined equation sets (11) and (12) can be solved by the least square method to obtain the inlet end reflection coefficient S of the test pump 2 11 Inlet end transmission coefficient S 12 Exit end reflection coefficient S 22 The transmission coefficient of the outlet end S 21 I.e. the port acoustic transfer characteristic parameter of the test pump 2.
The above description is only a preferred embodiment of the present invention, and any modifications to the present invention without any inventive step will be apparent to those skilled in the art and are intended to fall within the scope of the present invention.
Claims (6)
1. A test bed for testing acoustic transmission characteristics of a port of a vane pump is characterized by comprising an auxiliary pump, a test pump, a flowmeter, a flow regulating valve I, water path regulating valves II-XII, a water tank and a water path system of the water tank; the auxiliary pump and the test pump are connected through a pipeline, and the auxiliary pump and the test pump are both connected with the water tank through pipelines to form a main loop of the waterway circulation system; flow meters are arranged on outlet pipelines of the auxiliary pump and the test pump;
the test bed can be divided into a monitoring system and an adjusting control system; the monitoring system consists of two groups of four piezoelectric pressure sensors which are respectively positioned on the inlet pipeline and the outlet pipeline of the test pump, and each group comprises two piezoelectric pressure sensors which are used for monitoring sound pressure signals at different frequencies, which are excited by the auxiliary pump, at the inlet pipeline and the outlet pipeline of the test pump; the adjusting control system comprises a first waterway adjusting valve group arranged between the auxiliary pump and the test pump, a flow adjusting valve I arranged on an outlet pipeline of the auxiliary pump, a second waterway adjusting valve group arranged between the test pump and the water tank and a waterway adjusting valve IX arranged on an outlet pipeline of the test pump; the adjusting control system adjusts an external sound source or external acoustic impedance received by the test pump; the first water path adjusting valve group comprises a water path adjusting valve IV, a water path adjusting valve V and a water path adjusting valve VI which are arranged in parallel, wherein a water path adjusting valve II and a water path adjusting valve VII are respectively connected in series on two sides of the water path adjusting valve IV and the water path adjusting valve V, and a water path adjusting valve III and a water path adjusting valve VIII are respectively connected in series on two sides of the water path adjusting valve V and the water path adjusting valve VI; the second water route adjustment valves group includes water route governing valve X, water route governing valve XI and water route governing valve XII of parallel arrangement.
2. A test rig for testing the acoustic transmission characteristics of a port of a vane pump as set forth in claim 1, wherein the adjusting step of the adjustment system includes: adjusting the variable frequency drive of the auxiliary pump to change the rotating speed of the auxiliary pump, and further changing the amplitude and frequency of sound pressure of the sound source of the auxiliary pump; controlling the opening of a flow regulating valve I on an outlet pipeline of the auxiliary pump so as to change the sound pressure amplitude of the auxiliary pump as a sound source; and adjusting different water path adjusting valves II-XII on the branch pipeline between the test pump and the auxiliary pump to enable the pipeline to be provided with different acoustic impedances.
3. A test rig for testing acoustic transmission characteristics of a port of a vane pump as set forth in claim 2, wherein the adjusting step includes a first test procedure, a second test procedure, a third test procedure, a fourth test procedure, and a calculating procedure;
the first test procedure: during testing, the waterway system selects a loop I, the testing pump is in a static state, the auxiliary pump runs and is at a preset rotating speed, the opening of the flow regulating valve I is regulated, and then the sound source intensity of the auxiliary pump as a sound source is changed, so that different sound pressure amplitude results measured by the piezoelectric pressure sensor group and the piezoelectric pressure sensor group on the inlet pipeline and the outlet pipeline of the testing pump can be obtained when the auxiliary pump as the sound source runs under different flow working conditions;
the second test procedure: on the basis of the first experiment process, the selection scheme of a waterway system loop during the experiment is changed, loops II-XII are selected, the acoustic impedance of an external waterway system of the test pump is changed, and other conditions are kept unchanged, so that different sound pressure amplitude results measured by a piezoelectric pressure sensor and a piezoelectric pressure sensor on inlet and outlet pipelines of the test pump can be obtained when the auxiliary pump is used as a sound source to operate under different flow working conditions under each waterway system loop scheme;
and (3) a third test process: on the basis of a first experimental process, the flow regulating valve I is kept at a preset opening, the rotating speed of the auxiliary pump is regulated through variable frequency driving, and then the sound source intensity and the sound source frequency of the sound source of the auxiliary pump are changed, so that different sound pressure amplitude results measured by the piezoelectric pressure sensor group and the piezoelectric pressure sensor group on the inlet pipeline and the outlet pipeline of the test pump can be obtained when the sound source of the auxiliary pump runs at different rotating speeds and different frequencies;
the fourth test procedure: on the basis of the first experiment process, waterway regulating valves IX in the loops I, II, III, IV, V, VI, VII, VIII, IX, X, XI and XII are closed, and the rest regulating valves are kept unchanged, so that the first experiment process, the second experiment process and the third experiment process are respectively completed;
and (3) calculating: and calculating port acoustic transmission characteristic parameters of the test pump according to different sound pressure amplitudes measured by the piezoelectric pressure sensor group on the inlet pipeline of the test pump in the first experiment process, the second experiment process, the third experiment process and the fourth experiment process.
4. Such as rightThe test bench for testing the acoustic transmission characteristics of the port of the vane pump as claimed in claim 3, wherein the port acoustic transmission characteristic parameters of the test pump comprise the inlet end reflection coefficient S of the test pump 11 Inlet end transmission coefficient S 12 Exit end reflection coefficient S 22 The transmission coefficient S of the outlet end 21 。
5. A test rig for testing acoustic transmission characteristics of a port of a vane pump as set forth in claim 3, wherein the calculation process includes: according to different sound pressure amplitudes measured by the piezoelectric pressure sensor group on the inlet pipeline of the test pump in the first experiment process, the second experiment process, the third experiment process and the fourth experiment process, the following equations are listed:
Δl up ＝x 2 -x 1 (3)
wherein p is 1,up (x, t) and p 2up (x, t) respectively represent sound pressure amplitudes respectively measured by two piezoelectric pressure sensors in a piezoelectric pressure sensor group on an inlet pipeline of the test pump;
and
respectively showing the plane sound pressure amplitude propagated along the positive direction and the negative direction in the inlet pipeline of the test pump,
and
respectively, the phase positions of the plane sound pressure, wherein the forward direction transmission refers to the direction of sound pressure wave transmission pointing to the inlet direction of the pump, and the reverse direction transmission refers to the direction of sound pressure wave transmission back to the inlet direction of the pump; x is the number of 1 And x 2 The distances from two piezoelectric pressure sensors in the piezoelectric pressure sensor group to the inlet end of the test pump are respectively; Δ l up Representing the distance between two piezoelectric pressure sensors in the piezoelectric pressure sensor group;
is an imaginary unit, ω =2 π f represents angular frequency, f represents frequency, k = ω/c 0 Represents wave number, c 0 Is the speed of sound in the medium; solving according to equations (1) - (3) to obtain:
according to different sound pressure amplitudes measured by the piezoelectric pressure sensor group on the outlet pipeline of the test pump in the first test process, the second test process, the third test process and the fourth test process, the following equations are listed:
Δl down ＝x 4 -x 3 (8)
wherein p is 1,down (x, t) and p 1,down (x, t) respectively represents the outlet of the test pumpSound pressure amplitudes respectively measured by two piezoelectric pressure sensors in a piezoelectric pressure sensor group on the pipeline;
and
respectively represents the plane sound pressure amplitude value propagated along the positive direction and the negative direction in the outlet pipeline of the test pump,
and
respectively, the phases of the plane sound pressure, wherein the forward propagation refers to the direction of sound pressure wave propagation pointing to the outlet direction of the pump, and the reverse propagation refers to the direction of sound pressure wave propagation back to the outlet direction of the pump; x3 and x4 are the distances from two piezoelectric pressure sensors in the piezoelectric pressure sensor group to the outlet end of the test pump respectively; Δ l down Representing the distance between two piezoelectric pressure sensors in the piezoelectric pressure sensor group; solving according to equations (6) - (8) yields:
n data sets obtained by solving equations (1) to (3) and (6) to (8)
And
the following set of equations is listed:
the overdetermined equation sets (11) and (12) can be solved by a least square method to obtain the inlet end reflection coefficient S of the test pump 11 Inlet end transmission coefficient S 12 Exit end reflection coefficient S 22 The transmission coefficient S of the outlet end 21 。
6. The test bed for testing the acoustic transmission characteristics of the port of the vane pump as claimed in claim 1, wherein the distance between the two piezoelectric pressure sensors in each group at the inlet pipe and the outlet pipe is 10 to 20 times the inner diameter of the pipe.
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