Noise reduction method for engine supercharger

Abstract

The invention relates to the technical field of engines, and discloses a noise reduction method for an engine supercharger, which comprises the following steps: acquiring an initial interval value of a backflow gap between a flow guide ring and a pressure shell; setting n spacing improvement values according to the spacing initial value of the backflow gap; according to the distance improvement value, the height of the flow guide ring is adjusted, and the nth flow guide ring is manufactured; the n flow guide ring is used for manufacturing a supercharger, and the supercharger is tested; acquiring operation data of the supercharger under different working conditions; judging whether the operation data meet noise requirements or not; if the noise requirement is met, the nth flow guide ring is the optimal flow guide ring; and if the noise requirement is not met, the test is repeated. Therefore, according to the noise reduction method of the engine supercharger, the improved structure is planned based on the initial structure of the supercharger, the noise test is carried out on the improved supercharger to determine the structure meeting the noise requirement, and therefore the problem that the noise of the supercharger exceeds the limit is solved, and meanwhile the noise reduction method of the engine supercharger has the advantages of being easy to operate, low in cost and easy to achieve.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a method for reducing noise in an engine turbocharger. Background Technology

[0002] As users pay increasing attention to the comfort of ships, reducing the noise of large engines is an important solution. However, the noise generated by the turbocharger accounts for a large proportion, causing great trouble for users and also reducing the overall quality of the engine.

[0003] Turbocharger noise is divided into structural noise and aerodynamic noise. The compressor housing, as the core component of the turbocharger, has a structural design that significantly impacts the level of structural noise. The impeller, as the core aerodynamic component of the turbocharger, is the primary source of aerodynamic noise. Furthermore, the lack of systematic noise reduction methods in current turbocharger technology frequently leads to excessive noise levels. Summary of the Invention

[0004] To address the aforementioned shortcomings, the technical problem to be solved by this invention is to provide a noise reduction method for an engine turbocharger. Based on the initial structure of the turbocharger, an improved structure is planned, and the improved turbocharger is tested to determine the improved structure that meets the noise requirements. This solves the problem of turbocharger noise exceeding limits and has the advantages of simple operation, low cost, and easy implementation.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] A noise reduction method for an engine turbocharger, the turbocharger including a pressure housing and a guide ring disposed at the inlet of the pressure housing, a backflow gap being provided between the pressure housing and the guide ring, the noise reduction method comprising the following steps:

[0007] S10. Obtain the initial value A0 of the reflow gap;

[0008] S20. Based on the initial value A0 of the reflow gap, set n gap improvement values ​​A1 and A2. n n is a positive integer;

[0009] S30, Based on the spacing improvement value A n Adjust the height of the guide ring to create the nth guide ring;

[0010] S40. A turbocharger is made using the nth guide ring, and the turbocharger is tested.

[0011] S50: Obtain the operating data of the turbocharger under different operating conditions;

[0012] S60. Determine whether the operating data meets the noise requirements;

[0013] S70. If the operating data meets the noise requirements, the nth guide ring is the optimal guide ring.

[0014] If the running data does not meet the noise requirements, update the value of n and execute S40.

[0015] In a preferred embodiment, S30 includes: adjusting the spacing improvement value A. n Adjust the height of the guide ring, set the side wall of the guide ring to be a concave arc-shaped side wall, the cross-section of the arc-shaped side wall is a circular arc, and set the radius R of the circular arc to the maximum value on the premise of ensuring a smooth transition of the nth guide ring, and make the nth guide ring.

[0016] The preferred method is to use a spacing improvement value A. n Within the preset value range.

[0017] In a preferred embodiment, S70 further includes:

[0018] S710. If the operating data does not meet the noise requirements, determine whether n turbocharger tests have been completed.

[0019] S720: If n turbocharger tests have been completed, generate the corresponding improved impeller signal;

[0020] If n turbocharger tests are not completed, update the value of n and execute S40;

[0021] S80. Based on the improved impeller signal, the impeller is improved to obtain a booster that meets the noise requirements.

[0022] In a preferred embodiment, S80 includes:

[0023] S800. Based on the improved impeller signal, obtain the initial value B0 of the impeller's geometric parameters;

[0024] S810. Based on the initial value B0 of the impeller's geometric parameters, set the improved geometric parameter values ​​B for m impellers. m m is a positive integer;

[0025] S820, Improved value B based on impeller geometry parameters m Improve the impeller and produce the m-th impeller;

[0026] S830. A booster is made using the m-th impeller, and the booster is tested.

[0027] S840: Obtain the operating data of the turbocharger under different operating conditions;

[0028] S850, determine whether the operating data meets the noise requirements;

[0029] S860. If the operating data meets the noise requirements, the m-th impeller is the optimal impeller, and a booster that meets the noise requirements is obtained.

[0030] If the running data does not meet the noise requirements, update the value of m and execute S830.

[0031] In a preferred embodiment, S820 includes:

[0032] S8200, based on the improved value B of the impeller's geometric parameters. m Improve the impeller and produce the m-th impeller;

[0033] S8210. Perform CFD simulation calculations on the m-th impeller to calculate the strength of the m-th impeller;

[0034] S8220. Determine whether the strength of the m-th impeller meets the strength requirements;

[0035] S8230. If the strength of the m-th impeller meets the strength requirements, execute S830.

[0036] If the strength of the m-th impeller does not meet the strength requirements, update the value of m and execute S8200.

[0037] In a preferred embodiment, S860 further includes:

[0038] S8600: If the operating data does not meet the noise requirements, determine whether m turbocharger tests have been completed.

[0039] S8610. If m turbocharger tests have been completed, generate the corresponding optimized limit signal.

[0040] If m turbocharger tests are not completed, update the value of m and execute S830;

[0041] S8620: Based on the optimization limit signal, issue the corresponding optimization result prompt.

[0042] In a preferred embodiment, S800 further includes: obtaining an initial value of the number of blades of the impeller based on the improved impeller signal;

[0043] The S810 further includes: setting an improved value for the number of blades based on the initial value of the number of blades;

[0044] The S820 includes: an improvement value based on the number of impeller blades and a geometric parameter improvement value B. m Improve the impeller and produce the m-th impeller.

[0045] The preferred method is that the impeller's geometric parameters include the blade profile and the impeller inlet angle.

[0046] The preferred method is to use a spacing improvement value A. n-1 = Spacing Improvement Value A n -i, where i is a natural number.

[0047] After adopting the above technical solution, the beneficial effects of the present invention are:

[0048] The noise reduction method for an engine turbocharger according to the present invention includes a turbocharger comprising a pressure housing and a guide ring disposed at the inlet of the pressure housing, wherein a return flow gap is provided between the pressure housing and the guide ring. The noise reduction method includes the following steps: obtaining an initial value A0 of the return flow gap spacing; and setting n spacing improvement values ​​A based on the initial value A0 of the return flow gap spacing. n According to the improved spacing value A n The invention involves adjusting the height of the guide ring to create the nth guide ring; using the nth guide ring to construct a turbocharger, which is then tested; obtaining operating data of the turbocharger under different operating conditions; determining whether the operating data meets noise requirements; if the operating data meets the noise requirements, the nth guide ring is the optimal guide ring; if the operating data does not meet the noise requirements, the value of n is updated, and the test is repeated. Therefore, this invention mainly plans an improved structure based on the initial turbocharger structure and conducts noise tests on the improved turbocharger to determine the improved structure that meets noise requirements, thus solving the problem of turbocharger noise exceeding limits. Furthermore, this invention has the advantages of simple operation, low cost, and ease of implementation. Attached Figure Description

[0049] Figure 1 This is a flowchart of Example 1;

[0050] Figure 2 This is a flowchart illustrating Example 2;

[0051] Figure 3 This is a schematic diagram of the structure of the pressure shell and the flow guide ring in this invention;

[0052] Figure 4 yes Figure 3 Cross-sectional view of the intermediate pressure shell and the flow guide ring;

[0053] Figure 5 This is a cross-sectional view of the pressure shell and guide ring in the prior art;

[0054] Figure 6 This is a top view of the impeller in Embodiment 2;

[0055] Figure 7 This is a schematic diagram of the impeller structure in Example 2;

[0056] Figure 8 It is a comparison chart of the turbocharger noise curves before and after the improvement;

[0057] Figure 9 This is a schematic diagram of the turbocharger housing and flow guide ring in this invention;

[0058] In the diagram: 1-Guide ring, 2-Compression casing, 3-Impeller, 30-Long blade, 31-Short blade. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0060] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0061] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] The turbocharger involved in this invention is an air compressor driven by a structure consisting of two coaxial impellers that handle exhaust gas from an internal combustion engine. The impellers are pneumatic wheels located within the turbocharger housing, which draw in air, compress it, and deliver it to the engine.

[0063] The flow guide ring involved in this invention is an annular shell located at the inlet of the pressure shell, which guides and rectifies the gas entering the pressure shell.

[0064] The CFD simulation involved in this invention is a method for simulating fluid flow using computer technology. CFD is short for Computational Fluid Dynamics. CFD is equivalent to conducting virtual experiments on a computer to simulate actual fluid flow conditions. Its basic principle is to numerically solve the differential equations governing fluid flow to obtain the discrete distribution of the fluid flow field over a continuous region, thereby approximating the fluid flow conditions.

[0065] Example 1:

[0066] like Figure 1 As shown, a noise reduction method for an engine turbocharger is disclosed. The turbocharger involved in this invention includes a pressure housing 2 and a guide ring 1 disposed at the inlet of the pressure housing 2. See [link to relevant documentation]. Figure 3 , Figure 4 and Figure 5 A backflow gap A is provided between the pressure shell 2 and the guide ring 1, see [reference]. Figure 9 .

[0067] The noise reduction method for an engine turbocharger of the present invention includes the following steps:

[0068] Step S10: Obtain the initial value A0 of the reflow gap spacing;

[0069] Step S20: Based on the initial value A0 of the reflow gap, set n gap improvement values ​​A. n n is a positive integer, used to represent the sequence number. n can be, but is not limited to, 5. Specifically, the spacing improvement value includes spacing improvement value A1, spacing improvement value A2, spacing improvement value A3, spacing improvement value A4 and spacing improvement value A5.

[0070] In this embodiment, the spacing improvement value A n-1 = Spacing Improvement Value A n -i, where i is a natural number, the improved spacing value set using the above formula changes linearly, facilitating the production and management of the guide ring. Of course, the improved spacing value A... n The settings can be adjusted according to the actual structure of the turbocharger and noise reduction requirements.

[0071] A preferred embodiment is to let the spacing improvement value A n Within the preset value range, if the backflow gap spacing is too large, it will cause local turbulence in the compressor intake duct and result in high noise. If the backflow gap spacing is too small, it will cause turbocharger surge. Based on the above reasons, the present invention presets the value range of the backflow gap spacing to ensure the original performance of the turbocharger and improve the efficiency of the guide ring improvement and optimization.

[0072] Step S30: Based on the improved spacing value A n Adjust the height of the guide ring to create the nth guide ring;

[0073] Step S40: Use the nth guide ring to make a turbocharger and test the turbocharger;

[0074] Step S50: Obtain the operating data of the turbocharger under different operating conditions;

[0075] Step S60: Determine whether the running data meets the noise requirements;

[0076] Step S70: If the running data meets the noise requirements, the nth guide ring is the optimal guide ring;

[0077] If the running data does not meet the noise requirements, update the value of n, execute step S40, and repeat the improvement test.

[0078] It should be noted that this invention avoids repeated testing of turbochargers with the same structure by updating the value of n. Specifically, the value of n can be updated by setting n = a, where a is any positive integer not equal to n in the interval [1, n]. For example, if n is originally 1, a can be any one of 2, 3, 4, and 5. Alternatively, the value of n can also be updated by setting n = n + 1.

[0079] like Figure 1 As shown, the noise reduction method for the engine turbocharger of the present invention is based on the existing guide ring structure. Specifically, based on the initial value of the backflow gap between the existing guide ring and the pressure shell, multiple improved gap values ​​are set. Then, the guide ring is made according to the improved gap values, and the turbocharger is made using the improved guide ring. The turbocharger is then subjected to bench testing to obtain operating data under different operating conditions. The operating data includes boost ratio, noise level, intake air flow, etc. Then, based on the operating data, it is determined whether the turbocharger meets the noise requirements, and thus the guide ring and turbocharger that meet the noise requirements are determined.

[0080] As can be seen, the noise reduction method for the engine turbocharger of the present invention is based on the initial structure of the turbocharger, plans an improved structure, and tests the improved turbocharger to determine the improved structure that meets the noise requirements, thereby solving the problem of turbocharger noise exceeding the limit; at the same time, the present invention has the advantages of simple operation, low cost and easy implementation.

[0081] For example: Assuming the initial value of the backflow gap is A0=9mm, five schemes can be set, i.e. n=5, i=1. Then the improved gap values ​​are A1=8, A2=7, A3=6, A4=5, and A5=4. After testing, it was found that when the improved gap value is A4=5, the noise requirement is met.

[0082] like Figure 3 , Figure 4 and Figure 9 As shown, in this embodiment, while adjusting the height of the guide ring, the sidewall of the nth guide ring can be set as a concave arc-shaped sidewall. The cross-section of this arc-shaped sidewall is a circular arc, and the radius R of the circular arc is set to the maximum value on the premise of ensuring a smooth transition of the nth guide ring.

[0083] In existing technologies, the sidewalls of the flow guide ring have a right-angle structure, see [reference]. Figure 5 In traditional airflow guide rings, right-angled structures are prone to airflow separation and vortices at the right-angle corners, leading to increased air resistance, significant noise, and energy loss. In contrast, the arc-shaped sidewall airflow guide ring used in this invention allows for smoother airflow, reducing airflow separation and vortex generation, thereby lowering air resistance and energy loss, and resulting in relatively lower noise.

[0084] like Figure 1As shown, the noise reduction method for the engine turbocharger of the present invention includes the following steps in step S70:

[0085] Step S710: If the operating data does not meet the noise requirements, determine whether n turbocharger tests have been completed.

[0086] Step S720: If n booster tests have been completed, generate the corresponding improved impeller signal;

[0087] If n turbocharger tests are not completed, update the value of n and proceed to step S40.

[0088] Step S80: Based on the improved impeller signal, improve the impeller to obtain a booster that meets the noise requirements.

[0089] The present invention controls the number of times the guide ring structure is improved through the above method, thereby controlling the entire process of turbocharger noise reduction improvement and improving the efficiency of noise reduction optimization.

[0090] In this embodiment, the booster has completed the counting and judgment of the number of tests, which can be achieved using the following method:

[0091] Step S710: If the running data does not meet the noise requirement, let n = n + 1;

[0092] Determine if n is greater than the preset first test number, which can be 5, 6, 7, ...;

[0093] Step S720: If n is greater than the preset first test number, let n=1 and generate the corresponding improved impeller signal;

[0094] If n is not greater than the preset first test number, proceed to step S40;

[0095] Step S80: Based on the improved impeller signal, improve the impeller to obtain a booster that meets the noise requirements.

[0096] Example 2:

[0097] like Figure 2 As shown, this embodiment is basically the same as Embodiment 1, except that: this embodiment provides a specific method for impeller improvement, namely step S80 described in Embodiment 1, which specifically includes:

[0098] Step S800: Obtain the initial value B0 of the impeller's geometric parameters based on the improved impeller signal;

[0099] Based on the improved impeller signal, obtain the initial value of the number of impeller blades;

[0100] Step S810: Based on the initial value B0 of the impeller's geometric parameters, set the improved geometric parameter values ​​B for m impellers. m m is a positive integer;

[0101] Based on the initial value of the number of blades, an improvement value for the number of blades is set; in a preferred embodiment, the improvement value for the number of blades may be, but is not limited to, 16.

[0102] It should be noted that the impeller blade profile, impeller inlet angle, flow channel shape and size are all important factors affecting the aerodynamic noise of the turbocharger. Based on this, the geometric parameters of the impeller in this invention include the blade profile and the impeller inlet angle.

[0103] Step S820: Based on the improved value of the number of impeller blades and the improved value of geometric parameters B... m Improve the impeller and produce the m-th impeller;

[0104] Step S830: Use the m-th impeller to make a booster and test the booster;

[0105] Step S840: Obtain the operating data of the turbocharger under different operating conditions;

[0106] Step S850: Determine whether the running data meets the noise requirements;

[0107] Step S860: If the operating data meets the noise requirements, the m-th impeller is the optimal impeller, and a booster that meets the noise requirements is obtained.

[0108] like Figure 6 and Figure 7 As shown, based on the existing turbocharger impeller 3, this invention takes into account production costs and turbocharger responsiveness, and sets the number of blades to 16. Specifically, it sets 8 long blades 30 and 8 short blades 31. A larger number of blades can better guide the airflow, making the air more finely divided in the impeller 3, making the compression process more continuous and stable, reducing airflow fluctuations and turbulence, reducing the risk of surge, and thus reducing aerodynamic noise.

[0109] This invention mainly uses a three-dimensional inverse problem design method to optimize the blade load distribution, reduce the intensity of wake turbulence (reduce broadband noise sources), adjust the leading / tail edge geometry of the blades (such as by adopting a swept-edge design), delay flow separation and reduce vortex shedding noise; the impeller 3 with more blades can divide the air into finer segments, making the compression process more continuous and stable, reducing violent fluctuations and turbulence in the airflow, thereby reducing airflow noise.

[0110] In addition, see the comparison of the noise curves of the turbocharger before and after the improvement. Figure 8 , Figure 8Curve L1 represents the noise curve of the improved turbocharger, and curve L2 represents the noise curve of the original turbocharger. Through these two noise curves, it can be clearly seen that the noise reduction method of this invention reduces the structural noise and aerodynamic noise of the turbocharger, improves the overall NVH quality, and the noise reduction helps to improve the NVH (noise, vibration, and harshness) quality of the turbocharger and even the entire vehicle, providing a quieter and more comfortable driving environment for passengers.

[0111] like Figure 2 As shown, step S820 in this embodiment specifically includes:

[0112] Step S8200: Improve the value B based on the impeller's geometric parameters. m Improve the impeller and produce the m-th impeller;

[0113] Step S8210: Perform CFD simulation calculations on the m-th impeller to calculate the strength of the m-th impeller;

[0114] Step S8220: Determine whether the strength of the m-th impeller meets the strength requirements;

[0115] Step S8230: If the strength of the m-th impeller meets the strength requirements, proceed to step S830.

[0116] If the strength of the m-th impeller does not meet the strength requirements, update the value of m and execute step S8200, that is, repeatedly improve the geometric parameters of the impeller.

[0117] It should be noted that this invention avoids repeated testing of turbochargers with the same structure by updating the value of m. Specifically, the value of m can be updated by setting m = b, where b is any positive integer not equal to m in the interval [1, m]. For example, if m was originally 2, b can be any one of 1, 3, 4, and 5. Alternatively, the value of m can also be updated by setting m = m + 1.

[0118] In this invention, the impeller uses leading-edge swept blades, see [link / reference]. Figure 6 and Figure 7 The reverse design method is used to optimize the inlet leading edge curve and airflow angle, reduce airflow separation, and eliminate high-speed vortices. Specifically, the impeller inlet tilt angle is optimized to 50.3°. The performance of the impeller and the airflow distribution are simulated by CFD to evaluate different design schemes and continuously adjust the geometric parameters of the impeller to achieve the best aerodynamic performance.

[0119] like Figure 7 As shown, in this embodiment, the impeller adopts a gradually expanding outlet structure, and the airflow gradually decelerates at the outlet, converting kinetic energy into pressure energy, improving the pressurization effect, and reducing the intensity of wake turbulence (reducing broadband noise sources).

[0120] like Figure 2As shown, in this embodiment, step S860 further includes:

[0121] Step S8600: If the operating data does not meet the noise requirements, determine whether m booster tests have been completed.

[0122] Step S8610: If m turbocharger tests have been completed, generate the corresponding optimization limit signal;

[0123] If m turbocharger tests are not completed, update the value of m and proceed to step S830.

[0124] Step S8620: Based on the optimization limit signal, issue the corresponding optimization result prompt.

[0125] The present invention limits the number of times the impeller geometry parameters can be improved through the above steps, ensuring the original performance of the turbocharger. Furthermore, if the turbocharger still cannot meet the noise requirements after n improvements to the guide ring and m improvements to the impeller geometry parameters, there is no need to improve the turbocharger further. Instead, a prompt is issued, saving the cost of noise reduction improvement.

[0126] In this embodiment, the counting and determination of the number of turbocharger tests can be performed using the following method:

[0127] Step S8600: If the running data does not meet the noise requirements, let m = m + 1;

[0128] Step S8610: Determine whether m is greater than the preset number of second tests. The number of second tests can be, but is not limited to, 3, 4, 5, etc.

[0129] If m is greater than the preset second test number, let m=1 to generate the corresponding optimization limit signal;

[0130] If m is not greater than the preset second test number, proceed to step S830;

[0131] Step S8620: Based on the optimization limit signal, issue the corresponding optimization result prompt.

[0132] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications or improvements to the noise reduction method of an equivalent engine turbocharger made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for noise reduction of an engine turbocharger, the turbocharger comprising a pressure housing and a guide ring disposed at the inlet of the pressure housing, wherein a backflow gap is provided between the pressure housing and the guide ring, characterized in that, The noise reduction method includes the following steps: S10. Obtain the initial value A0 of the reflow gap; S20, according to the interval initial value A0 of the backflow gap, set n interval improvement values A n , n is a positive integer; S30、according to the distance improvement value A n , adjusting the height of the guide ring, and manufacturing the nth guide ring; S40. A turbocharger is made using the nth guide ring, and the turbocharger is tested. S50: Obtain the operating data of the turbocharger under different operating conditions; S60. Determine whether the operating data meets the noise requirements; S70. If the operating data meets the noise requirements, the nth guide ring is the optimal guide ring. If the running data does not meet the noise requirements, update the value of n and execute S40.

2. The noise reduction method for an engine turbocharger according to claim 1, characterized in that, The S30 comprises: adjusting the height of the flow guiding ring according to the interval improvement value A n , adjusting the height of the flow guiding ring according to the interval improvement value A 3. The noise reduction method for an engine turbocharger according to claim 1, characterized in that, Pitch improvement value A n in a predetermined numerical range.

4. The noise reduction method for an engine turbocharger according to claim 1, characterized in that, The S70 also includes: S710. If the operating data does not meet the noise requirements, determine whether n turbocharger tests have been completed. S720: If n turbocharger tests have been completed, generate the corresponding improved impeller signal; If n turbocharger tests are not completed, update the value of n and execute S40; S80. Based on the improved impeller signal, the impeller is improved to obtain a booster that meets the noise requirements.

5. The noise reduction method for an engine turbocharger according to claim 4, characterized in that, The S80 includes: S800. Based on the improved impeller signal, obtain the initial value B0 of the impeller's geometric parameters; S810, according to the initial value B0 of the geometric parameter of the impeller, set the improved value B of the geometric parameter of the m impellers m , m is a positive integer; S820, improving the value B according to the geometric parameters of the impeller m , improving the impeller, and manufacturing the mth impeller; S830. A booster is made using the m-th impeller, and the booster is tested. S840: Obtain the operating data of the turbocharger under different operating conditions; S850, determine whether the operating data meets the noise requirements; S860. If the operating data meets the noise requirements, the m-th impeller is the optimal impeller, and a booster that meets the noise requirements is obtained. If the running data does not meet the noise requirements, update the value of m and execute S830.

6. The noise reduction method for an engine turbocharger according to claim 5, characterized in that, The S820 includes: S8200, based on the improved value B of the impeller's geometric parameters. m Improve the impeller and produce the m-th impeller; S8210. Perform CFD simulation calculations on the m-th impeller to calculate the strength of the m-th impeller; S8220. Determine whether the strength of the m-th impeller meets the strength requirements; S8230. If the strength of the m-th impeller meets the strength requirements, execute S830. If the strength of the m-th impeller does not meet the strength requirements, update the value of m and execute S8200.

7. The noise reduction method for an engine turbocharger according to claim 5, characterized in that, The S860 also includes: S8600: If the operating data does not meet the noise requirements, determine whether m turbocharger tests have been completed. S8610. If m turbocharger tests have been completed, generate the corresponding optimized limit signal. If m turbocharger tests are not completed, update the value of m and execute S830; S8620: Based on the optimization limit signal, issue the corresponding optimization result prompt.

8. The noise reduction method for an engine turbocharger according to claim 5, characterized in that, The S800 further includes: obtaining an initial value of the number of blades of the impeller based on the improved impeller signal; The S810 further includes: setting an improved value for the number of blades based on the initial value of the number of blades; The S820 includes: an improvement value based on the number of impeller blades and a geometric parameter improvement value B. m Improve the impeller and produce the m-th impeller.

9. The noise reduction method for an engine turbocharger according to claim 8, characterized in that, The geometric parameters of an impeller include the blade profile and the impeller inlet angle.

10. The noise reduction method for an engine turbocharger according to claim 1, characterized in that, Spacing Improvement Value A n-1 = Spacing Improvement Value A n -i, where i is a natural number.

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