A supercharger noise simulation test device and test analysis method

Abstract

The present invention discloses a supercharger noise test device and a test analysis method, including a supercharger body, through a bench simulation test of the supercharger body, the dynamic pressure data of the inlet end and the outlet end of the supercharger at different speeds are obtained, and then a corresponding performance map is drawn, and then a noise map is drawn according to the performance map and multiple noise measurement values ​​before and after compression, so that the actual performance of the supercharging can be reflected very intuitively, so that the product design stage can enter the verification and modification process as early as possible, greatly reducing the development time, cost and risk of the whole vehicle. A supercharger noise test device and a test analysis method provided by the present invention can simulate the test device of the operating environment of the supercharger on the engine and perform test analysis, collect and analyze relevant data during the operation process, and realize the judgment of the performance of the supercharger.

Description

Technical Field

[0001] The invention relates to the technical field of superchargers, in particular to a supercharger noise simulation test device and a test analysis method. Background Art

[0002] The turbocharger is a commonly used automotive supercharger that uses the engine exhaust to drive the exhaust turbine in the turbine to rotate, thereby driving the coaxial compressor impeller to rotate. The impeller presses the air sent from the air filter pipe and pressurizes it into the cylinder, thereby improving the charging efficiency and optimizing the engine's combustion process.

[0003] During the engine test and development phase, the turbocharger needs to be verified for performance, including noise performance. In the prior art, research on turbocharger noise is conducted on an engine bench or a vehicle bench. If problems are found during this testing phase, it is too late for the project development cycle, which will severely compress the time for subsequent design changes, resulting in rhythmic problems in project progress. If the later changes cannot be completed on schedule, the entire R&D cycle will be extended and R&D costs will increase. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to overcome the defects of the prior art, to provide a test device that can simulate the operating environment of the supercharger on the engine, to combine the simulation test device in the research and development stage, and to achieve product optimization and improvement through continuous simulation experiments.

[0005] A technical solution adopted by the present invention is: to provide a supercharger noise simulation test device, including a supercharger body, the air inlet end of the supercharger body is connected to a first connecting pipe, the other end of the first connecting pipe is connected to a low-pressure measuring pipe, the other end of the low-pressure measuring pipe is connected to a first muffler, the other end of the first muffler is connected to a second connecting pipe, and the other end of the second connecting pipe is used to communicate with an external filtered air end; a mass flow meter is arranged in the second connecting pipe, and at least one pre-pressure dynamic pressure sensor and a pre-pressure total pressure sensor are arranged on the low-pressure measuring pipe;

[0006] The air outlet end of the supercharger body is connected to a third connecting pipe, the other end of the third connecting pipe is connected to a high-pressure measuring pipe, the other end of the high-pressure measuring pipe is connected to a second muffler pipe, the other end of the second muffler pipe is connected to a fourth connecting pipe, and the other end of the fourth connecting pipe is directly connected to the external air end; the high-pressure measuring pipe is provided with at least one post-compression dynamic pressure sensor and a post-compression total pressure sensor;

[0007] The supercharger body is provided with a rotation speed measuring instrument for measuring its rotation speed.

[0008] The supercharger noise testing device of the present invention has the following advantages:

[0009] The supercharger noise simulation test device of the present invention is actually a device for simulating the working environment of the supercharger on the engine. Specifically, corresponding connecting pipelines and measuring tubes for installing measuring elements are respectively arranged on the air intake pipe and exhaust pipe of the supercharger for filtering air, so as to measure the pressure parameters in the pipeline before and after supercharging of the corresponding supercharger, so as to judge the performance of the supercharger; in addition, in this structure, in order to more accurately measure the dynamic pressure (noise) data in the pipe before and after supercharging, corresponding silencer pipes are arranged on the air intake pipe and the air outlet end, so as to effectively eliminate external noise and improve the accuracy of the measurement data.

[0010] Furthermore, the first connecting pipe and the low-pressure measuring pipe, as well as the low-pressure measuring pipe and the first muffler pipe, are connected via a low-pressure vibration damping pipe; the third connecting pipe and the high-pressure measuring pipe, as well as the high-pressure measuring pipe and the second muffler pipe, are connected via a high-pressure vibration damping pipe. In this improved structure, vibration damping pipes are respectively arranged on the corresponding pipelines before and after supercharging to reduce the vibration during the simulated operation of the device, eliminate the influence of vibration on the test structure, and ensure the accuracy of the test data.

[0011] Further improved, the said pre-pressure dynamic pressure sensor and post-pressure dynamic pressure sensor are multiple, and the multiple pre-pressure dynamic pressure sensors are evenly distributed on the outer peripheral wall of the low-pressure measuring tube, and the multiple post-pressure dynamic pressure sensors are evenly distributed on the outer peripheral wall of the high-pressure measuring tube. In this improved structure, multiple dynamic pressure sensors are respectively arranged on the side walls of the low-pressure measuring tube and the high-pressure measuring tube, and multi-point measurement can ensure the accuracy of the measured value and avoid the influence of accidental factors.

[0012] Further improved, the low-pressure measuring tube and the high-pressure measuring tube are both provided with an annular connecting tube outside, and the connecting tube is evenly provided with multiple branch tubes connected to the connecting tube toward the center of the ring, and one end of the multiple branch tubes on the same connecting tube is respectively connected to the corresponding low-pressure measuring tube or high-pressure measuring tube; the connecting tube is also provided with a total pressure measuring branch tube connected to its inner cavity, and each total pressure measuring branch tube is connected to the corresponding pre-pressure total pressure sensor or post-pressure total pressure sensor. In this improved structure, the total pressure value in the tube is obtained by measuring at multiple points, and the measurement result is more accurate and stable.

[0013] In a further improvement, the low-pressure measuring tube is further provided with a first temperature sensor for measuring the temperature inside the tube before compression, and the high-pressure measuring tube is further provided with a second temperature sensor for measuring the temperature inside the tube after compression. In this improved structure, the corresponding temperature sensors are added, and the performance of the supercharger can be reflected from another aspect by comparing the temperatures before and after compression.

[0014] Another technical problem to be solved by the present invention is to provide a test and analysis method for a supercharger noise simulation test device, collect and analyze relevant data during the operation process, determine the performance of the supercharger, and improve and complete the supercharger product before the engine step test.

[0015] Accordingly, the present invention also provides a test and analysis method for the above-mentioned supercharger noise simulation test device, comprising the following steps:

[0016] S1: Fix the assembled supercharger body, the first connecting pipe, the second connecting pipe, the third connecting pipe, the fourth connecting pipe, the high-pressure measuring pipe and the low-pressure measuring pipe on the corresponding fixed stand; connect the hot air inlet end of the supercharger body with the hot air output end of the combustion chamber;

[0017] S2: simulate the operation of the supercharger body, measure the intake air flow and total pressure values ​​in the pipe before supercharging at multiple different speeds, and measure the total pressure value in the pipe after supercharging, and calculate the pressure ratio = total pressure in the pipe after supercharging / total pressure in the pipe before supercharging;

[0018] S3: Using data processing software, a performance map of the supercharger is drawn by interpolation method using multiple different operating speeds and pressure ratios corresponding to different operating rotations as parameters;

[0019] S4: Based on the supercharger performance map obtained in step S3, the in-tube noise (dynamic pressure) data before and after compression of multiple performance points are selected for collection, and then the noise data is added to the performance map obtained in step S3, and the noise map of the supercharger is obtained by interpolation method;

[0020] S5: analyzing and determining the noise performance of the supercharger according to the noise map of the supercharger in step S4.

[0021] After the above simulation test analysis in the present invention, the actual performance of supercharging can be reflected very intuitively according to the noise map, which plays a good guiding role in the application of supercharger Noisemap to supercharger matching and before the design of the vehicle intake system. When matching the supercharger, we usually have several superchargers that can meet the customer's performance requirements. At this time, any supercharger can be selected. When we use the noise map, we can compare the noise performance of several superchargers, advance the NVH evaluation of the whole vehicle, and evaluate the supercharger noise that may be faced in advance for the whole vehicle bench test or normal trial operation, thereby reducing the large-scale design changes of the whole vehicle due to NVH problems in the future, thereby greatly reducing the development time, cost and risk of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial structural schematic diagram of the supercharger noise simulation test device of the present invention.

[0023] Figure 2 It is the performance map of the supercharger in the present invention.

[0024] Figure 3 It is a noise map of different frequencies in the tube of the supercharger before and after compression in the present invention.

[0025] Figure 4 It is a noise map diagram obtained for two different design schemes in the same measurement area of ​​the supercharger in the present invention.

[0026] Specifically, 01-supercharger body, 02-hot air inlet end;

[0027] 1-first connecting pipe, 2-second connecting pipe, 3-low-pressure measuring pipe, 4-first silencer pipe, 5-third connecting pipe, 6-fourth connecting pipe, 7-high-pressure measuring pipe, 8-second silencer pipe, 9-low-pressure vibration damping pipe, 10-high-pressure vibration damping pipe, 11-connecting pipe, 12-branch pipe, 13-total pressure measuring branch pipe. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1 As shown, a supercharger noise simulation test device provided by the present invention comprises a supercharger body 01, an air inlet end of the supercharger body 01 is connected to a first connecting pipe 1, the other end of the first connecting pipe 1 is connected to a low-pressure measuring pipe 3, the other end of the low-pressure measuring pipe 3 is connected to a first muffler pipe 4, the other end of the first muffler pipe 4 is connected to a second connecting pipe 2, and the other end of the second connecting pipe 2 is connected to an air end filtered by a filter outside; a mass flow meter is arranged in the second connecting pipe 2, and at least one pre-pressure dynamic pressure sensor and a pre-pressure total pressure sensor are arranged on the low-pressure measuring pipe 3;

[0031] The air outlet end of the supercharger body 01 is connected to a third connecting pipe 5, the other end of the third connecting pipe 5 is connected to a high-pressure measuring pipe 7, the other end of the high-pressure measuring pipe 7 is connected to a second muffler pipe 8, the other end of the second muffler pipe 8 is connected to a fourth connecting pipe 6, the other end of the fourth connecting pipe 6 is directly connected to the external air end; at least one post-compression dynamic pressure sensor and a post-compression total pressure sensor are provided on the high-pressure measuring pipe 7;

[0032] The supercharger body 01 is provided with a rotation speed measuring instrument for measuring its rotation speed.

[0033] In order to reduce the impact of the equipment's own vibration during operation on the measurement accuracy of the parameters inside the pipe, in this embodiment, the first connecting pipe 1 and the low-pressure measuring pipe 3, as well as the low-pressure measuring pipe 3 and the first silencer pipe 4 are connected via a low-pressure vibration damping pipe 9; the third connecting pipe 5 and the high-pressure measuring pipe 7, as well as the high-pressure measuring pipe 7 and the second silencer pipe 8 are connected via a high-pressure vibration damping pipe 10.

[0034] On the other hand, in order to better ensure that the dynamic pressure value measurement data in the tube before and after compression is more accurate and stable, multiple pre-compression dynamic pressure sensors are evenly arranged on the circumferential side wall of the low-pressure measuring tube 3; multiple post-compression dynamic pressure sensors are evenly arranged on the circumferential side wall of the high-pressure measuring tube 7, so the data finally measured are the average value of the data collected at multiple test points, which can avoid the situation where a certain test point is inaccurate due to accidental factors. In this embodiment, there are three corresponding pre-compression dynamic pressure sensors and post-compression dynamic pressure sensors, and the three pre-compression dynamic pressure sensors and post-compression dynamic pressure sensors are evenly arranged on the corresponding low-pressure measuring tube 3 and high-pressure measuring tube 7 side walls along the circumferential direction.

[0035] The low-pressure measuring tube 3 and the high-pressure measuring tube 7 are both provided with an annular connecting tube 11. The connecting tube 11 is evenly provided with multiple branch tubes 12 connected to the connecting tubes toward the center of the ring. One end of the multiple branch tubes 12 on the same connecting tube 11 is respectively connected to the corresponding low-pressure measuring tube 3 or high-pressure measuring tube 7; and the connecting tube 11 is also provided with a total pressure measuring branch tube 13 connected to its inner cavity. The total pressure measuring branch tube 13 on the low-pressure measuring tube 3 is connected to the pre-pressure total pressure sensor to measure the total pressure value in the tube before pressurization; the total pressure measuring branch tube 13 on the high-pressure measuring tube 7 is connected to the post-pressure total pressure sensor to measure the total pressure value in the tube after pressurization. In this embodiment, four branch tubes 12 are evenly connected to each connecting tube 11.

[0036] In addition, a first temperature sensor for measuring the temperature inside the tube before supercharging is provided on the low-pressure measuring tube 3, and a second temperature sensor for measuring the temperature inside the tube after supercharging is provided on the side wall of the high-pressure measuring tube 7. The performance of the supercharger can be reflected from another aspect by comparing the temperatures before and after supercharging.

[0037] Correspondingly, the present invention also discloses a test and analysis method for a supercharger noise simulation test device, which specifically comprises the following steps:

[0038] S1: The assembled supercharger body 01, the first connecting pipe 1, the second connecting pipe 2, the third connecting pipe 5, the fourth connecting pipe 6, the high-pressure measuring pipe 7, and the low-pressure measuring pipe 3 are fixed on a corresponding fixed stand (not shown in the figure); the hot air inlet end 02 of the supercharger body 01 is connected to the hot air output end of the combustion chamber; in this step, the combustion chamber uses natural gas as fuel to provide hot air with controllable temperature, pressure and flow for the operation of the supercharger body 01, so as to achieve the same operating conditions as the supercharger simulation on the engine;

[0039] S2: simulate the operation of the supercharger body 01, measure and obtain the intake air flow rate and total pressure values ​​in the pipe before supercharging at multiple different speeds, and measure and obtain the total pressure value in the pipe after supercharging, and calculate the pressure ratio = total pressure in the pipe after supercharging / total pressure in the pipe before supercharging; in this step, the intake air flow in the pipe before supercharging is measured by the mass flow meter in the second connecting pipe 2, and the total pressure before supercharging is measured by the total pressure sensor before supercharging;

[0040] S3: Through data processing software, with multiple different operating speeds and pressure ratios corresponding to different operating rotations as parameters, the performance map of the supercharger is drawn through interpolation method; as shown in the attached figure Figure 2 As shown; the data processing software used in this step is Uniplot data processing software;

[0041] S4: Based on the supercharger performance map obtained in step S3, the in-pipe noise (dynamic pressure) data before and after compression of multiple performance points are selected for collection, and then the noise data is added to the performance map obtained in step S3, and the noise map (Noisemap) of the supercharger is obtained by interpolation. The multiple performance points in this step are the measurement points corresponding to the required parameter values ​​when drawing the performance map in step 3; specifically, the multiple set operating speeds selected in step 3, while respectively measuring the total pressure values ​​before and after compression, and the dynamic pressure values ​​measured by the corresponding dynamic pressure sensor;

[0042] S5: Analyze and determine the performance of the supercharger according to the noise map of the supercharger in step S4.

[0043] After the above simulation test analysis in the present invention, the supercharger Noisemap has a good guiding significance for the application of supercharger matching and before the design of the vehicle intake system. When matching the supercharger, we usually have several superchargers that can meet the performance requirements of the customer. At this time, any supercharger can be selected. When we use Noisemap, we can compare the noise performance of several superchargers, evaluate the NVH of the whole vehicle in advance, and evaluate the supercharger noise that the whole vehicle may face in advance, thereby reducing the large-scale design changes of the whole vehicle due to NVH problems in the future, thereby greatly reducing the development time, cost and risk of the whole vehicle.

[0044] Before designing the vehicle intake system, we can use Noisemap to know in advance the frequency band of the supercharger causing the loudest noise. The vehicle can optimize the noise in this frequency band in advance, thereby reducing the trial and error time and development costs. It provides guidance for the design of the vehicle intake system.

[0045] As attached Figure 3 As shown, the dynamic pressure values ​​of multiple performance points of the supercharger at different frequencies are drawn into a noise map by interpolation method.

[0046] Wherein P1dyn represents the noise map before compression, and P2dyn represents the noise map after compression; and the noise maps before compression and after compression respectively include noise maps of three different frequencies, and the figure shows noise maps of three frequencies of 1600Hz, 2000Hz, and 2500Hz. The selection of the above three frequencies is obtained based on the standard frequency of one-third octave. Of course, in other embodiments, the selection of custom frequency bands can also be performed according to needs, which will not be repeated here.

[0047] Attached Figure 4 This is a comparison of the Noisemaps of different superchargers. According to the operating area of ​​the engine, we can better select a supercharger with less noise. This comparison map is a comparison of the noise conditions of two different designs for the same operating area of ​​the supercharger.

[0048] Figure 4 In the figure, A represents the first solution, B represents the second solution, and Delta is the noise map after subtracting the noise maps of the two solutions, which indicates the advantages and disadvantages of the two solutions. Figure 4In the map corresponding to Delta shown in the figure, the areas corresponding to the colors corresponding to the Better direction are where Scheme A has advantages over Scheme B, and the areas corresponding to the colors corresponding to the Worse direction are where Scheme B has advantages over Scheme A. The noise map above can well realize the simulation comparison of the performance of each score of the supercharger during the design process, which has a good guiding significance for the optimization and improvement of the structure and the matching and selection of the supercharger.

[0049] The above is an explanation of the preferred embodiments of the present invention, but it cannot be understood as a limitation of the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A supercharger noise simulation test device, characterized in that: The invention comprises a supercharger body (01), wherein the air inlet end of the supercharger body (01) is connected to a first connecting pipe (1), the other end of the first connecting pipe (1) is connected to a low-pressure measuring pipe (3), the other end of the low-pressure measuring pipe (3) is connected to a first muffler (4), the other end of the first muffler (4) is connected to a second connecting pipe (2), and the other end of the second connecting pipe (2) is used to communicate with an external filtered air end; a mass flow meter is arranged in the second connecting pipe (2), and at least one pre-pressure dynamic pressure sensor and a pre-pressure total pressure sensor are arranged on the low-pressure measuring pipe (3); The air outlet end of the supercharger body (01) is connected to a third connecting pipe (5), the other end of the third connecting pipe (5) is connected to a high-pressure measuring pipe (7), the other end of the high-pressure measuring pipe (7) is connected to a second muffler pipe (8), the other end of the second muffler pipe (8) is connected to a fourth connecting pipe (6), and the other end of the fourth connecting pipe (6) is directly connected to the external air end; the high-pressure measuring pipe (7) is provided with at least one post-compression dynamic pressure sensor and a post-compression total pressure sensor; The supercharger body (01) is provided with a rotation speed measuring instrument for measuring its rotation speed; The first connecting pipe (1) and the low-pressure measuring pipe (3) as well as the low-pressure measuring pipe (3) and the first muffler pipe (4) are both connected via a low-pressure vibration damping pipe (9); the third connecting pipe (5) and the high-pressure measuring pipe (7) as well as the high-pressure measuring pipe (7) and the second muffler pipe (8) are both connected via a high-pressure vibration damping pipe (10).

2. The supercharger noise simulation test device according to claim 1, characterized in that: There are multiple pre-pressure dynamic pressure sensors and multiple post-pressure dynamic pressure sensors, and the multiple pre-pressure dynamic pressure sensors are evenly distributed on the outer peripheral wall of the low-pressure measuring tube (3), and the multiple post-pressure dynamic pressure sensors are evenly distributed on the outer peripheral wall of the high-pressure measuring tube (7).

3. The supercharger noise simulation test device according to claim 1, characterized in that: The low-pressure measuring tube (3) and the high-pressure measuring tube (7) are each provided with an annular connecting tube (11) on the outside. The connecting tube (11) is evenly provided with a plurality of branch tubes (12) connected to the connecting tube (11) toward the center of the ring. One end of the plurality of branch tubes (12) on the same connecting tube (11) is respectively connected to the corresponding low-pressure measuring tube (3) or high-pressure measuring tube (7). The connecting tube (11) is also provided with a total pressure measuring branch tube (13) connected to its inner cavity. Each total pressure measuring branch tube (13) is connected to a corresponding pre-pressure total pressure sensor or a post-pressure total pressure sensor.

4. The supercharger noise simulation test device according to claim 1, characterized in that: The low-pressure measuring tube (3) is also provided with a first temperature sensor for measuring the temperature inside the tube before compression, and the high-pressure measuring tube (7) is also provided with a second temperature sensor for measuring the temperature inside the tube after compression.

5. A test and analysis method based on the supercharger noise simulation test device according to any one of claims 1 to 4, It is characterized in that The following steps are involved: S1: fixing the assembled supercharger body (01), the first connecting pipe (1), the second connecting pipe (2), the third connecting pipe (5), the fourth connecting pipe (6), the high-pressure measuring pipe (7), and the low-pressure measuring pipe (3) on a corresponding fixed stand; connecting the hot air inlet end (02) of the supercharger body (01) to the hot air outlet end of the combustion chamber; S2: simulate the operation of the supercharger body (01), measure and obtain the intake air flow rate and total pressure values ​​in the pipe before supercharging at multiple different speeds, and simultaneously measure and obtain the total pressure value in the pipe after supercharging, and calculate the pressure ratio = total pressure in the pipe after supercharging / total pressure in the pipe before supercharging; S3: Using data processing software, a performance map of the supercharger is drawn by interpolation method using multiple different operating speeds and pressure ratios corresponding to different operating rotations as parameters; S4: Based on the supercharger performance map obtained in step S3, the in-tube noise (dynamic pressure) data before and after compression of multiple performance points are selected for collection, and then the noise data is added to the performance map obtained in step S3, and the noise map of the supercharger is obtained by interpolation method; S5: analyzing and determining the noise performance of the supercharger according to the noise map of the supercharger in step S4.

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