A method, system and storage medium for modeling environmentally friendly muffler

Abstract

The present invention relates to the field of data processing technology, and in particular to a modeling method, system and storage medium for an environmentally friendly muffler, the method comprising: obtaining an initial design model of an environmentally friendly muffler; identifying model structure information to perform segmented processing on the design model; performing simulation based on a preset throttle opening test sequence and a design model, obtaining a number of initial muffler performances corresponding to a number of muffler model segments, and determining a first key model segment based on the comparison results of the initial muffler performances; adjusting the preset key design parameters of the first key model segment, obtaining a number of first adjusted muffler performances corresponding to the adjustment, and outputting the adjusted design model based on the comparison results of the first adjusted muffler performance corresponding to the first key model segment and the preset muffler performance, or determining a second key model segment; adjusting the preset key design parameters of the second key model segment, and repeating the above steps until the muffler performances of all key model segments reach the preset muffler performances. The present invention optimizes the muffler performance of an environmentally friendly muffler.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to an environmental protection muffler modeling method, system and storage medium. Background Art

[0002] In the existing field of environmentally friendly muffler design and optimization, methods based on empirical formulas or simple geometric models are usually used for preliminary design and evaluation. Although these methods can guide the design of mufflers to a certain extent, they have significant disadvantages. First, traditional methods often ignore the impact of the complex structural characteristics of the muffler on its acoustic and aerodynamic performance, resulting in the designed muffler being unsatisfactory in practical applications and difficult to meet increasingly stringent environmental protection requirements. Secondly, existing modeling technologies lack systematicity and accuracy, and can usually only make rough estimates of the overall performance, and cannot accurately predict and adjust the segmented performance of each part, thus limiting the further optimization of the muffler performance.

[0003] The patent document of Chinese patent application publication number CN113626931A discloses a modeling method, device, storage medium and computer equipment for a muffler. The method includes: constructing a linear constraint function; constructing a nonlinear constraint function; calculating the obtained objective function, linear constraint function and nonlinear constraint function through a genetic algorithm function to generate a muffler parameter set; extracting multiple muffler parameters from the muffler parameter set; and modeling the muffler according to the multiple muffler parameters.

[0004] In the prior art, the complex muffler structure is generally viewed as a whole, and it is difficult to accurately identify the weak links in performance, resulting in poor optimization results of the muffler's noise reduction performance. Summary of the invention

[0005] To this end, the present invention provides an environmentally friendly muffler modeling method, system and storage medium, which can solve the problem of poor optimization results of the muffler's noise reduction performance.

[0006] To achieve the above object, the present invention provides an environmental protection muffler modeling method, the method comprising:

[0007] Obtain the initial design model of the environmental muffler;

[0008] Identifying model structure information of the initial design model, and segmenting the design model based on the model structure information to obtain a plurality of muffler model segments;

[0009] Performing simulation based on a preset throttle opening test sequence and the initial design model, obtaining a number of initial noise reduction performances corresponding to a number of muffler model sections based on the simulation results, and determining a first key model section based on comparison results of the initial noise reduction performances;

[0010] Matching the first key model segment with a preset model segment in a preset model library, determining preset key design parameters based on the matching result, adjusting the preset key design parameters based on the difference between the initial sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, obtaining a plurality of adjusted first adjusted sound attenuation performances, outputting an adjusted design model based on a comparison result between the first adjusted sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, or determining a second key model segment;

[0011] Adjust the preset key design parameters of the second key model section, and repeat the above steps until the sound absorption performance of all key model sections reaches the preset sound absorption performance.

[0012] Furthermore, the step of obtaining a number of initial noise reduction performances corresponding to a number of the muffler model sections based on the simulation results includes:

[0013] Performing acoustic simulation analysis on the initial design model, and extracting segmented acoustic performances corresponding to a number of muffler model segments based on the analysis results;

[0014] The initial noise reduction performance corresponding to any muffler model section is determined based on the analysis results of any of the segmented acoustic performances.

[0015] Furthermore, the step of extracting the segmented acoustic performance corresponding to the muffler model segments based on the analysis results includes:

[0016] Determine different initial sound wave frequencies corresponding to a preset throttle opening test sequence, and use acoustic simulation software to perform acoustic simulation on the initial design model using the initial sound wave frequencies;

[0017] Collecting a number of real-time sound wave frequencies corresponding to a number of the muffler model segments, and drawing a sound wave change graph based on the number of real-time sound wave frequencies;

[0018] Analyze the plurality of acoustic wave variation graphs, determine acoustic wave variation characteristics according to the analysis results, and determine initial acoustic performance based on the acoustic wave variation characteristics.

[0019] Further, the step of determining the first key model segment based on the comparison results of several initial noise reduction performances includes:

[0020] comparing the initial noise reduction performances with the preset noise reduction performances, and selecting an initial abnormal model segment based on the comparison results;

[0021] The first key model segment is determined based on initial noise reduction performance comparison results corresponding to a number of the initial abnormal model segments.

[0022] Furthermore, the step of adjusting the preset key design parameters of the first key model segment includes:

[0023] Calculating a difference between an initial noise reduction performance corresponding to the first key model segment and a preset noise reduction performance, and determining a first adjustment coefficient based on the difference;

[0024] Based on the first adjustment coefficient, the preset key design parameters of the first key model section are adjusted, and the acoustic simulation analysis is re-performed through the acoustic simulation software to determine the first adjusted sound absorption performance according to the simulation result, and the above adjustment and simulation analysis process is repeated based on the comparison result between the first adjusted sound absorption performance and the preset sound absorption performance, and the adjustment is stopped when the first adjusted sound absorption performance is greater than or equal to the preset sound absorption performance, or the adjustment is stopped when the first adjustment coefficient is equal to the preset coefficient.

[0025] Further, the step of outputting the adjustment design model based on the comparison result between the first adjustment noise reduction performance corresponding to the first key model segment and the preset noise reduction performance, or determining the second key model segment includes:

[0026] When the first adjusted noise reduction performance is greater than or equal to the preset noise reduction performance, outputting an adjusted design model;

[0027] When the first adjusted noise reduction performance is less than the preset noise reduction performance, the second key model segment is determined.

[0028] Furthermore, the step of determining the second key model segment includes:

[0029] comparing the first adjusted noise reduction performances with the preset noise reduction performances, and selecting a first abnormal model segment based on the comparison result;

[0030] Determine a key model segment for comparison based on the first adjusted noise reduction performance comparison results corresponding to the first abnormal model segments;

[0031] It is determined whether the compared key model segment is the same as the first key model segment, and the second key model segment is determined based on the determination result, or the initial design model of the environmentally friendly muffler is redesigned.

[0032] Furthermore, the step of adjusting the preset key design parameters of the second key model segment includes:

[0033] Calculating a difference between a first adjusted noise reduction performance and a preset noise reduction performance corresponding to the second key model segment, and determining a second adjustment coefficient based on the difference;

[0034] Based on the second adjustment coefficient, the preset key design parameters of the second key model section are adjusted, and the acoustic simulation analysis is re-performed through the acoustic simulation software to determine the second adjusted sound absorption performance according to the simulation results, and the above adjustment and simulation analysis process is repeated based on the comparison result between the second adjusted sound absorption performance and the preset sound absorption performance, and the adjustment is stopped when the second adjusted sound absorption performance is greater than or equal to the preset sound absorption performance, or the adjustment is stopped when the second adjustment coefficient is equal to the preset coefficient.

[0035] In another aspect, the present invention provides an environmentally friendly muffler modeling system, the system comprising:

[0036] An acquisition module is used to obtain an initial design model of an environmentally friendly muffler;

[0037] A segmentation module, connected to the acquisition module, for identifying the model structure information of the initial design model, and performing segmentation processing on the design model based on the model structure information to obtain a plurality of muffler model segments;

[0038] a simulation module connected to the segmentation module, for performing simulation based on a preset throttle opening test sequence and the initial design model, obtaining a number of initial noise reduction performances corresponding to a number of muffler model segments based on the simulation results, and determining a first key model segment based on comparison results of the initial noise reduction performances;

[0039] an adjustment module connected to the simulation module, for matching the first key model segment with a preset model segment in a preset model library, determining preset key design parameters based on a matching result, adjusting the preset key design parameters based on a difference between an initial sound attenuation performance corresponding to the first key model segment and a preset sound attenuation performance, obtaining a plurality of adjusted first adjusted sound attenuation performances, outputting an adjustment design model based on a comparison result between the first adjusted sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, or determining a second key model segment;

[0040] A repeating module is connected to the adjusting module and is used to adjust the preset key design parameters of the second key model section and repeat the above steps until the noise reduction performance of all key model sections reaches the preset noise reduction performance.

[0041] On the other hand, the present invention provides a storage medium, characterized in that a program or instruction is stored on the storage medium, and when the program or instruction is executed by a processor, the steps of the environmental muffler modeling method as described in any one of claims 1 to 8 are implemented.

[0042] Compared with the prior art, the beneficial effect of the present invention is that, by obtaining the initial design model of the environmentally friendly muffler, an accurate data basis is provided for subsequent analysis, processing and optimization work. By identifying the structural information of the design model and performing segmented processing on it, the complex overall structure of the muffler can be decomposed into several relatively independent muffler model segments, and the role and performance of each part in the muffler process can be studied in more detail. Different segments have different effects on sound waves and airflow due to their own structural characteristics and different positions in the muffler. After segmented processing, it is convenient to perform separate acoustic and aerodynamic analysis on each segment, so as to more accurately find out the parts with performance problems, which provides convenience for the subsequent determination of key model segments, and then optimize the key segments in a targeted manner instead of blindly adjusting the entire muffler, thereby improving the optimization efficiency and effect. By performing simulation based on a preset throttle opening test sequence, the actual working conditions of the muffler under different throttle openings can be simulated, and the initial muffler performance of each muffler model segment under various working conditions can be accurately obtained, which truly reflects the muffler. The performance of the muffler in actual use provides more accurate data support for optimization design. By comparing the results of several initial silencer performances, the first key model section can be determined, which can accurately find the part that has a greater impact on the overall silencer performance under the initial design state, so that the subsequent optimization work can concentrate resources, thereby more efficiently improving the overall silencer performance of the muffler. By comparing the first adjusted silencer performance with the preset silencer performance, the change in the silencer performance after adjusting the key model section can be directly seen, ensuring that the silencer performance of the muffler is constantly approaching the preset silencer performance, and improving the accuracy of the muffler model design. By repeatedly adjusting the preset key design parameter steps of the key model section until the silencer performance of all key model sections reaches the preset silencer performance, the overall optimization of the entire muffler can be achieved. The iterative optimization process fully considers the mutual influence between the various key parts, ensuring that while improving the silencer performance of each key section, the acoustic and aerodynamic performance of the entire muffler as a whole at different throttle openings can reach the best state, thereby effectively improving the silencer effect of the muffler.

[0043] In particular, by determining different initial sound wave frequencies corresponding to the preset throttle opening test sequence and using them for acoustic simulation, the sound wave conditions faced by the muffler under different working conditions in actual work can be fully considered, which provides a reliable basis for the subsequent accurate analysis of the performance of each model section of the muffler, and helps to optimize the muffler design according to the differences in acoustic characteristics under different working conditions, so as to improve the muffler effect under different working conditions. By collecting the real-time sound wave frequencies corresponding to each muffler model section and drawing a sound wave change graph, complex acoustic phenomena can be presented in an intuitive and visual way, which greatly improves the analysis efficiency and the intuitive understanding of the acoustic performance of the muffler, and facilitates the rapid positioning of possible problems in the acoustic performance of each model section of the muffler. By deeply analyzing the sound wave change graph to determine the sound wave change characteristics, and then determining the initial acoustic performance, it is possible to achieve an accurate evaluation of the acoustic performance of each model section of the muffler, and more comprehensively understand the actual sound processing capabilities of each model section under different working conditions, which provides an accurate basis for accurately judging the contribution of each model section to the overall muffler effect.

[0044] In particular, by calculating the difference between the initial silencer performance corresponding to the first key model section and the preset silencer performance, the gap between the performance of the current silencer in this key part and the expected target can be clarified in a quantitative manner, which provides an accurate basis for the subsequent targeted adjustment of the preset key design parameters. The preset key design parameters of the first key model section are adjusted based on the first adjustment coefficient, which effectively improves the silencer performance of the silencer in this part, thereby improving the overall silencer effect. The acoustic simulation analysis is re-performed through the acoustic simulation software, and the first adjusted silencer performance is determined according to the simulation results. The actual silencer effect feedback of the silencer in the key model section after adjusting the preset key design parameters can be obtained in time, thereby improving the efficiency of the adjustment process. Based on the iterative optimization mechanism, it is ensured that the silencer performance of the silencer in the first key model section can continue to approach and ultimately reach the preset target requirements, effectively improving the silencer performance of the silencer in key parts, thereby promoting the performance optimization of the entire silencer. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of a flow chart of an environmentally friendly muffler modeling method provided by an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of the structure of an environmentally friendly muffler in a modeling method for an environmentally friendly muffler provided in an embodiment of the present invention;

[0047] Figure 3 A schematic diagram of a flow chart corresponding to step S400 in a method for modeling an environmentally friendly muffler provided in an embodiment of the present invention;

[0048] Figure 4A structural block diagram of an environmentally friendly muffler modeling system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0051] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0052] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] See also Figure 1 As shown, an embodiment of the present invention provides an environmentally friendly muffler modeling method, the method comprising:

[0054] Step S100, obtaining an initial design model of an environmentally friendly muffler;

[0055] Step S200, identifying the model structure information of the initial design model, segmenting the design model based on the model structure information, and obtaining a plurality of muffler model segments;

[0056] Step S300, performing simulation based on a preset throttle opening test sequence and the initial design model, obtaining a number of initial noise reduction performances corresponding to a number of muffler model sections based on the simulation results, and determining a first key model section based on comparison results of the initial noise reduction performances;

[0057] Step S400, matching the first key model segment with a preset model segment in a preset model library, determining preset key design parameters based on the matching result, adjusting the preset key design parameters based on the difference between the initial sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, obtaining a plurality of adjusted first adjusted sound attenuation performances, outputting an adjusted design model based on a comparison result between the first adjusted sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, or determining a second key model segment;

[0058] Step S500, adjusting the preset key design parameters of the second key model segment, and repeating the above steps until the noise reduction performance of all key model segments reaches the preset noise reduction performance.

[0059] Specifically, the embodiment of the present invention provides accurate data basis for subsequent analysis, processing and optimization work by obtaining the initial design model of the environmentally friendly muffler. By identifying the structural information of the design model and performing segmented processing on it, the complex overall structure of the muffler can be decomposed into several relatively independent muffler model segments, and the role and performance of each part in the muffler process can be studied in more detail. Different segments have different effects on sound waves and airflow due to their own structural characteristics and different positions in the muffler. After segmented processing, it is convenient to perform separate acoustic and aerodynamic analysis on each segment, so as to more accurately find out the parts with performance problems, which provides convenience for the subsequent determination of key model segments, and then optimize the key segments in a targeted manner instead of blindly adjusting the entire muffler, thereby improving the optimization efficiency and effect. By performing simulation based on a preset throttle opening test sequence, the actual working conditions of the muffler under different throttle openings can be simulated, and the initial muffler performance of each muffler model segment under various working conditions can be accurately obtained, which truly reflects the actual muffler in actual The performance in use provides more accurate data support for the optimization design. By comparing the results of several initial silencer performances, the first key model section can be determined, which can accurately find the part that has a greater impact on the overall silencer performance under the initial design state, so that the subsequent optimization work can concentrate resources, thereby more efficiently improving the overall silencer performance of the muffler. By comparing the first adjusted silencer performance with the preset silencer performance, the change in the silencer performance after the key model section is adjusted can be directly seen, ensuring that the silencer performance of the muffler is constantly approaching the preset silencer performance, and improving the accuracy of the muffler model design. By repeatedly adjusting the preset key design parameter steps of the key model section until the silencer performance of all key model sections reaches the preset silencer performance, the overall optimization of the entire muffler can be achieved. The iterative optimization process fully considers the mutual influence between the various key parts, ensuring that while improving the silencer performance of each key section, it can also ensure that the acoustic and aerodynamic performance of the entire muffler as a whole at different throttle openings are in the best state, thereby effectively improving the silencer effect of the muffler.

[0060] Specifically, the preset model library described in the embodiment of the present invention is determined based on the muffler data of several historical muffler models, and the changes in the muffler performance corresponding to the changes in different design parameters of each model segment in several historical muffler models are analyzed. Based on several change results, the design parameters that have the greatest impact on the muffler performance are selected as the key design parameters of the muffler model segment, and the preset model library is constructed based on several muffler model segments and their corresponding key design parameters. For example, when the muffler model segment is the inlet end, the corresponding key design parameter is the pipe diameter of the inlet end, when the muffler model segment is the chamber, the corresponding key design parameter is the chamber length, when the muffler model segment is the partition, the corresponding key design parameter is the partition perforation rate, and when the muffler model segment is the outlet end, the corresponding key design parameter is the outlet pipe diameter.

[0061] See also Figure 2 As shown, it is a possible structural diagram of the environmental protection silencer described in an embodiment of the present invention, in which an inlet end 1, a first chamber 2, a first partition 3 and an outlet end 5 are shown, wherein a plurality of perforations 4 are arranged on the partition. When the engine is running, the noise generated enters the inlet end 1 of the environmental protection silencer along the exhaust pipe along with the high-temperature and high-speed airflow. The airflow carries the noise and first enters the first chamber. In this chamber, due to the sudden change of space, the airflow velocity will be reduced, and part of the noise will begin to decay initially due to the reflection of the sound waves. At the same time, the airflow interacts with the chamber wall and the sound-absorbing materials that may exist inside, and part of the sound energy is absorbed and converted into other forms of energy such as heat energy. Then, the airflow will enter the next chamber through the first partition 3 with a plurality of perforations. When the airflow passes through the perforations of the partition, complex acoustic and aerodynamic phenomena will occur. From an acoustic point of view, the perforated partition plays a role of filtering and impedance matching. Different frequencies The sound waves of certain frequencies will be reflected, transmitted and diffracted at the perforations. For sound waves of certain frequencies, the perforated baffle and the adjacent chambers can form a structure similar to a Helmholtz resonator. When the sound wave frequency is close to the resonance frequency, the sound wave energy will be efficiently absorbed and attenuated. From the aerodynamic point of view, when the airflow passes through the perforations, the speed and pressure will change. This change further disrupts the propagation characteristics of the noise, so that the noise is further weakened when passing through the perforations. Subsequently, the airflow passes through multiple chambers in sequence, and the above-mentioned reflection, absorption and interaction with the perforated baffle are repeated in each chamber. During the transmission between chambers, the noise is continuously attenuated and the airflow gradually tends to be stable. Finally, after being processed by the multi-stage chambers, the airflow with greatly reduced noise is discharged into the atmosphere through the outlet port 5, thereby effectively reducing the pollution of the surrounding environment by the engine exhaust noise and the impact on the comfort of the vehicle itself.

[0062] It can be understood that the embodiment of the present invention performs segmentation processing on the design model based on the model structure information, and obtains several muffler model segments by treating the environmental muffler according to the inlet end and the outlet end as two separate model segments, dividing the multi-stage chamber according to the partition, and treating any chamber and its corresponding partition as a separate model segment. For example, as mentioned above Figure 2 As shown in the environmental protection silencer model shown in , the inlet end 1, the first chamber 2 and the first partition 3, the second chamber 6 and the third partition 7, the fourth chamber 8 and the fourth partition 9, and the outlet end 5 are divided into 6 model sections.

[0063] It can be understood that the preset throttle opening in the embodiment of the present invention is to collect a number of throttle openings corresponding to a number of vehicles during operation, sort them and use the sorting results as the preset throttle opening test sequence.

[0064] Specifically, the step of obtaining a number of initial noise reduction performances corresponding to a number of the muffler model sections based on the simulation results includes:

[0065] Performing acoustic simulation analysis on the initial design model, and extracting segmented acoustic performances corresponding to a number of muffler model segments based on the analysis results;

[0066] The initial noise reduction performance corresponding to any muffler model section is determined based on the analysis results of any of the segmented acoustic performances.

[0067] It can be understood that the acoustic simulation software described in the embodiment of the present invention may be Actran, LMS Virtual, Lab Acoustics, etc.

[0068] Specifically, the step of extracting the segmented acoustic performance corresponding to the muffler model segments based on the analysis results includes:

[0069] Determine different initial sound wave frequencies corresponding to a preset throttle opening test sequence, and use acoustic simulation software to perform acoustic simulation on the initial design model using the initial sound wave frequencies;

[0070] Collecting a number of real-time sound wave frequencies corresponding to a number of the muffler model segments, and drawing a sound wave change graph based on the number of real-time sound wave frequencies;

[0071] Analyze the plurality of acoustic wave variation graphs, determine acoustic wave variation characteristics according to the analysis results, and determine initial acoustic performance based on the acoustic wave variation characteristics.

[0072] Specifically, the embodiment of the present invention determines different initial sound wave frequencies corresponding to the preset throttle opening test sequence and uses them to perform acoustic simulation, which can comprehensively consider the sound wave conditions faced by the muffler under different working conditions in actual work, and provides a reliable basis for the subsequent accurate analysis of the performance of each model section of the muffler, and helps to optimize the muffler design according to the differences in acoustic characteristics under different working conditions, so as to improve the muffler effect under different working conditions. The real-time sound wave frequency corresponding to each muffler model section is collected and a sound wave change diagram is drawn, which can present complex acoustic phenomena in an intuitive and visual manner, greatly improving the analysis efficiency and the intuitiveness of understanding the acoustic performance of the muffler, and facilitating the rapid positioning of possible problems in the acoustic performance of each model section of the muffler. By deeply analyzing the sound wave change diagram to determine the sound wave change characteristics, and then determining the initial acoustic performance, it is possible to achieve an accurate evaluation of the acoustic performance of each model section of the muffler, and more comprehensively understand the actual sound processing capability of each model section under different working conditions, which provides an accurate basis for accurately judging the contribution of each model section to the overall muffler effect.

[0073] It is understandable that, in the acoustic simulation of the embodiment of the present invention, the parameters of the acoustic model need to be set according to the actual structure and material properties of the muffler, including the acoustic impedance of each component, the sound absorption coefficient of the sound-absorbing material, etc. For different muffler model sections, such as the inlet end, chamber, partition and outlet pipe, their acoustic boundary conditions are defined respectively. For example, the inlet end can be set as the noise source input boundary, which is set according to the spectral characteristics and intensity of the engine exhaust noise; the wall surface inside the chamber can be set with different reflection and absorption characteristics according to its material; the perforation of the partition needs to be specially processed considering the transmission and reflection laws of the sound waves. The process of acoustic simulation is a prior art and will not be repeated here.

[0074] It can be understood that the steps of determining the acoustic wave variation characteristics according to the analysis results in the present invention include:

[0075] Analyze any of the sound wave variation diagrams, determine the attenuation degree of the sound pressure level at different sound wave frequencies based on the analysis results, and determine the initial sound absorption performance based on several attenuation degrees.

[0076] It can be understood that the step of determining the attenuation degree of the sound pressure level at different sound wave frequencies according to the analysis result in the embodiment of the present invention may include:

[0077] Selecting a number of sound wave frequency points based on the abscissa of the sound wave variation graph;

[0078] Identify the inlet sound pressure level and the outlet sound pressure level corresponding to any of the sound wave frequency points based on the sound wave variation graph, and calculate the sound pressure level attenuation based on the inlet sound pressure level and the outlet sound pressure level;

[0079] A weighted average sound pressure level attenuation is calculated based on the preset weight and the sound pressure level attenuation, and the initial sound absorption performance is determined based on the weighted average sound pressure level attenuation.

[0080] It can be understood that in the embodiment of the present invention, several sound wave frequency points are selected to generally cover the entire frequency range that needs to be paid attention to in the muffler design, for example, from the low frequency band (such as 100 Hz) to the high frequency band (such as 5000 Hz), which can be selected according to logarithmic or linear intervals, such as 100 Hz, 200 Hz, 500 Hz, 1000 Hz, 2000 Hz, 5000 Hz, etc.

[0081] It can be understood that, in the embodiment of the present invention, the sound pressure level attenuation=the sound pressure level at the inlet-the sound pressure level at the outlet.

[0082] It is understandable that the embodiments of the present invention assign different preset weights to different frequencies according to the application scenarios and design requirements of the muffler. For example, for the exhaust muffler of an automobile engine, low-frequency noise may have a greater impact on the overall noise level and comfort of the vehicle, so a relatively high weight can be given to the low-frequency band. Then calculate the weighted average sound pressure level attenuation , where f is the frequency, w(f) is the preset weight, is the weighted average sound pressure level attenuation, is the sound pressure level attenuation. The weighted average sound pressure level attenuation is positively correlated with the initial sound insulation performance. The larger the value, the better the overall sound insulation effect.

[0083] Specifically, the step of determining the first key model segment based on the comparison results of several initial noise reduction performances includes:

[0084] comparing the initial noise reduction performances with the preset noise reduction performances, and selecting an initial abnormal model segment based on the comparison results;

[0085] The first key model segment is determined based on initial noise reduction performance comparison results corresponding to a number of the initial abnormal model segments.

[0086] It is understandable that the preset noise reduction performance described in the embodiment of the present invention may be a noise reduction performance index preset according to the design objectives and performance requirements of the muffler. For example, for a specific automobile engine exhaust muffler, the preset noise reduction performance may require that the noise reduction in the low frequency band (such as 100Hz to 500Hz) reaches more than 30dB, the noise reduction in the medium frequency band (such as 500Hz to 2000Hz) reaches more than 20dB, and the noise reduction in the high frequency band (such as 2000Hz to 5000Hz) reaches more than 15dB.

[0087] It can be understood that, in the embodiment of the present invention, when the initial sound-absorbing performance is less than the preset sound-absorbing performance, it is regarded as the initial abnormal mode section.

[0088] It can be understood that the embodiment of the present invention ranks the initial noise reduction performances corresponding to a number of initial model segments from small to large, and selects the initial model segment corresponding to the first in the ranking as the first key model segment.

[0089] See also Figure 3 As shown, the step of adjusting the preset key design parameters of the first key model segment includes:

[0090] Step S410, calculating a difference between an initial noise reduction performance corresponding to the first key model segment and a preset noise reduction performance, and determining a first adjustment coefficient based on the difference;

[0091] Step S420, adjusting the preset key design parameters of the first key model segment based on the first adjustment coefficient, re-performing acoustic simulation analysis through acoustic simulation software to determine the first adjusted sound absorption performance according to the simulation results, repeating the above adjustment and simulation analysis process based on the comparison result between the first adjusted sound absorption performance and the preset sound absorption performance, and stopping the adjustment when the first adjusted sound absorption performance is greater than or equal to the preset sound absorption performance, or stopping the adjustment when the first adjustment coefficient is equal to the preset coefficient.

[0092] Specifically, the embodiment of the present invention can clarify the gap between the performance of the current muffler in this key part and the expected target in a quantitative manner by calculating the difference between the initial muffler performance and the preset muffler performance corresponding to the first key model section, thereby providing an accurate basis for the subsequent targeted adjustment of the preset key design parameters. The preset key design parameters of the first key model section are adjusted based on the first adjustment coefficient, thereby effectively improving the muffler performance in this part, thereby improving the overall muffler effect. The acoustic simulation analysis is re-performed through the acoustic simulation software, and the first adjusted muffler performance is determined according to the simulation results. The actual muffler effect feedback of the muffler in the key model section after adjusting the preset key design parameters can be obtained in a timely manner, thereby improving the efficiency of the adjustment process. Based on the iterative optimization mechanism, it is ensured that the muffler performance in the first key model section can continuously approach and ultimately reach the preset target requirements, thereby effectively improving the muffler performance in key parts, thereby promoting the performance optimization of the entire muffler.

[0093] It can be understood that the first adjustment coefficient in the embodiment of the present invention is the difference value divided by the preset noise reduction performance.

[0094] It can be understood that in the embodiment of the present invention, when the inlet end is used as the first key model section, if the first adjustment coefficient is 0.2, and the inlet diameter can be adjusted within the range of ±20% of the original diameter, assuming that the original inlet diameter is 50 mm, then the adjustment amount of the diameter is calculated according to the first adjustment coefficient. Adjustment amount = original diameter × first adjustment coefficient × adjustment direction coefficient (it can be determined whether to increase or decrease the diameter according to the actual situation, such as assuming that the diameter is increased here, the adjustment direction coefficient is 1), that is, adjustment amount = 50 × 0.2 × 1 = 10 mm. Therefore, the adjusted inlet diameter is 50 + 10 = 60 mm.

[0095] It can be understood that when the chamber of the embodiment of the present invention is used as the first key model section: taking the chamber length as an example, if the chamber length can be adjusted within the range of ±30%, the first adjustment coefficient is 0.2, and the original chamber length is 200mm. Calculate the adjustment amount of the chamber length: adjustment amount = original chamber length × first adjustment coefficient × adjustment direction coefficient (assuming that the length is increased to improve the soundproofing performance, the adjustment direction coefficient is 1), that is, adjustment amount = 200 × 0.2 × 1 = 40mm, and the adjusted chamber length is 200 + 40 = 240mm, where the chamber length can be adjusted by adjusting the distance between the partitions;

[0096] For the partition part, if the partition perforation rate can be adjusted between 10% and 60%, the first adjustment coefficient is 0.2, and the original perforation rate is 30%. Calculate the adjustment amount of the perforation rate: Assuming that the perforation rate is increased to optimize the acoustic performance, the adjustment directivity coefficient is 1, and the adjustment amount = (60% to 30%) × the first adjustment coefficient × the adjustment directivity coefficient = (0.6-0.3) × 0.2 × 1 = 0.06, that is, the adjusted perforation rate is 30% + 0.06 = 30.6%.

[0097] It can be understood that when the outlet end of the embodiment of the present invention is used as the first key model section, if the outlet diameter can be adjusted within the range of ±20% of the original diameter, the first adjustment coefficient is 0.2, and the original outlet diameter is 40 mm. Calculate the adjustment amount of the outlet diameter: adjustment amount = original outlet diameter × first adjustment coefficient × adjustment direction coefficient (assuming that the diameter is reduced to reduce outlet noise, the adjustment direction coefficient is -1), that is, adjustment amount = 40 × 0.2 × (-1) = -8 mm. The adjusted outlet diameter is 40-8 = 32 mm.

[0098] It is understandable that the preset coefficients described in the embodiments of the present invention are determined based on the actual engineering feasibility and cost constraints, and a reasonable adjustment range is determined for each adjustable parameter. For example, the adjustment range of the inlet pipe diameter may be limited by the standard size and installation space of the engine exhaust pipe, and is generally adjusted within the range of ±20% of the original pipe diameter; the adjustment range of the chamber length should consider the overall size requirements of the muffler and the vehicle chassis space layout, and can vary within the range of ±30%; the adjustment range of the partition perforation rate should consider the mechanical strength and processing technology of the partition, and is usually adjusted between 10% and 60%.

[0099] Specifically, the step of outputting the adjustment design model based on the comparison result between the first adjusted noise reduction performance corresponding to the first key model segment and the preset noise reduction performance, or determining the second key model segment includes:

[0100] When the first adjusted noise reduction performance is greater than or equal to the preset noise reduction performance, outputting an adjusted design model;

[0101] When the first adjusted noise reduction performance is less than the preset noise reduction performance, the second key model segment is determined.

[0102] Specifically, the step of determining the second key model segment includes:

[0103] comparing the first adjusted noise reduction performances with the preset noise reduction performances, and selecting a first abnormal model segment based on the comparison result;

[0104] Determine a key model segment for comparison based on the first adjusted noise reduction performance comparison results corresponding to the first abnormal model segments;

[0105] It is determined whether the compared key model segment is the same as the first key model segment, and the second key model segment is determined based on the determination result, or the initial design model of the environmentally friendly muffler is redesigned.

[0106] It can be understood that, in the embodiment of the present invention, when the comparison key model segment is different from the first key model segment, the comparison key model segment is determined to be the second key model segment;

[0107] When the compared key model section is identical to the first key model section, the initial design model of the environmentally friendly muffler is redesigned.

[0108] It is understandable that the redesign of the initial design model of the environmentally friendly muffler in the embodiment of the present invention may require re-examination and adjustment of the overall structural layout, preset key design parameter ranges of each component, etc.

[0109] Specifically, the step of adjusting the preset key design parameters of the second key model segment includes:

[0110] Calculating a difference between a first adjusted noise reduction performance and a preset noise reduction performance corresponding to the second key model segment, and determining a second adjustment coefficient based on the difference;

[0111] Based on the second adjustment coefficient, the preset key design parameters of the second key model section are adjusted, and the acoustic simulation analysis is re-performed through the acoustic simulation software to determine the second adjusted sound absorption performance according to the simulation results, and the above adjustment and simulation analysis process is repeated based on the comparison result between the second adjusted sound absorption performance and the preset sound absorption performance, and the adjustment is stopped when the second adjusted sound absorption performance is greater than or equal to the preset sound absorption performance, or the adjustment is stopped when the second adjustment coefficient is equal to the preset coefficient.

[0112] See also Figure 4 As shown, an embodiment of the present invention further provides an environmentally friendly muffler modeling system, the system comprising:

[0113] An acquisition module 10 is used to acquire an initial design model of the environmentally friendly muffler;

[0114] A segmentation module 20, connected to the acquisition module 10, for identifying the model structure information of the initial design model, and performing segmentation processing on the design model based on the model structure information to obtain a plurality of muffler model segments;

[0115] A simulation module 30, connected to the segmentation module 20, is used to perform simulation based on a preset throttle opening test sequence and the initial design model, obtain a number of initial noise reduction performances corresponding to a number of muffler model segments based on the simulation results, and determine a first key model segment based on comparison results of the initial noise reduction performances;

[0116] An adjustment module 40, connected to the simulation module 30, is used to match the first key model segment with a preset model segment in a preset model library, determine preset key design parameters based on the matching result, adjust the preset key design parameters based on the difference between the initial sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, obtain a plurality of adjusted first adjusted sound attenuation performances, output an adjusted design model based on a comparison result between the first adjusted sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, or determine a second key model segment;

[0117] The repetition module 50 is connected to the adjustment module 40 and is used to adjust the preset key design parameters of the second key model section and repeat the above steps until the noise reduction performance of all key model sections reaches the preset noise reduction performance.

[0118] Specifically, an embodiment of the present invention further provides a storage medium, characterized in that a program or instruction is stored on the storage medium, and when the program or instruction is executed by a processor, the steps of the environmental muffler modeling method as described in any one of claims 1 to 8 are implemented.

[0119] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0120] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A modeling method for an environmentally friendly muffler, characterized in that: include: Obtain the initial design model of the environmental muffler; Identifying model structure information of the initial design model, and segmenting the design model based on the model structure information to obtain a plurality of muffler model segments; Performing simulation based on a preset throttle opening test sequence and the initial design model, obtaining a number of initial noise reduction performances corresponding to a number of muffler model sections based on the simulation results, and determining a first key model section based on comparison results of the initial noise reduction performances; Matching the first key model segment with a preset model segment in a preset model library, determining preset key design parameters based on the matching result, adjusting the preset key design parameters based on the difference between the initial sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, obtaining a plurality of adjusted first adjusted sound attenuation performances, outputting an adjusted design model based on a comparison result between the first adjusted sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, or determining a second key model segment; Adjust the preset key design parameters of the second key model section, and repeat the above steps until the sound absorption performance of all key model sections reaches the preset sound absorption performance.

2. The environmental protection muffler modeling method according to claim 1 is characterized in that: The step of obtaining a number of initial noise reduction performances corresponding to a number of muffler model sections based on the simulation results comprises: Performing acoustic simulation analysis on the initial design model, and extracting segmented acoustic performances corresponding to a number of muffler model segments based on the analysis results; The initial noise reduction performance corresponding to any muffler model section is determined based on the analysis results of any of the segmented acoustic performances.

3. The environmental protection muffler modeling method according to claim 2 is characterized in that: The step of extracting the segmented acoustic performance corresponding to the muffler model segments based on the analysis results comprises: Determine different initial sound wave frequencies corresponding to a preset throttle opening test sequence, and use acoustic simulation software to perform acoustic simulation on the initial design model using the initial sound wave frequencies; Collecting a number of real-time sound wave frequencies corresponding to a number of the muffler model segments, and drawing a sound wave change graph based on the number of real-time sound wave frequencies; Analyze the plurality of acoustic wave variation graphs, determine acoustic wave variation characteristics according to the analysis results, and determine initial acoustic performance based on the acoustic wave variation characteristics.

4. The environmental protection muffler modeling method according to claim 3 is characterized in that: The step of determining the first key model segment based on the comparison results of several initial noise reduction performances includes: comparing the initial noise reduction performances with the preset noise reduction performances, and selecting an initial abnormal model segment based on the comparison results; The first key model segment is determined based on initial noise reduction performance comparison results corresponding to a number of the initial abnormal model segments.

5. The environmental protection muffler modeling method according to claim 4 is characterized in that: The step of adjusting the preset key design parameters of the first key model segment comprises: Calculating a difference between an initial noise reduction performance corresponding to the first key model segment and a preset noise reduction performance, and determining a first adjustment coefficient based on the difference; Based on the first adjustment coefficient, the preset key design parameters of the first key model section are adjusted, and the acoustic simulation analysis is re-performed through the acoustic simulation software to determine the first adjusted sound absorption performance according to the simulation result, and the above adjustment and simulation analysis process is repeated based on the comparison result between the first adjusted sound absorption performance and the preset sound absorption performance, and the adjustment is stopped when the first adjusted sound absorption performance is greater than or equal to the preset sound absorption performance, or the adjustment is stopped when the first adjustment coefficient is equal to the preset coefficient.

6. The environmental protection muffler modeling method according to claim 5 is characterized in that: The step of outputting the adjustment design model based on the comparison result between the first adjustment noise reduction performance corresponding to the first key model segment and the preset noise reduction performance, or determining the second key model segment includes: When the first adjusted noise reduction performance is greater than or equal to the preset noise reduction performance, outputting an adjusted design model; When the first adjusted noise reduction performance is less than the preset noise reduction performance, the second key model segment is determined.

7. The environmental muffler modeling method according to claim 6, characterized in that: The step of determining the second key model segment comprises: comparing the first adjusted noise reduction performances with the preset noise reduction performances, and selecting a first abnormal model segment based on the comparison result; Determine a key model segment for comparison based on the first adjusted noise reduction performance comparison results corresponding to the first abnormal model segments; It is determined whether the compared key model segment is the same as the first key model segment, and the second key model segment is determined based on the determination result, or the initial design model of the environmentally friendly muffler is redesigned.

8. The environmental muffler modeling method according to claim 7, characterized in that: The step of adjusting the preset key design parameters of the second key model segment includes: Calculating a difference between a first adjusted noise reduction performance and a preset noise reduction performance corresponding to the second key model segment, and determining a second adjustment coefficient based on the difference; Based on the second adjustment coefficient, the preset key design parameters of the second key model section are adjusted, and the acoustic simulation analysis is re-performed through the acoustic simulation software to determine the second adjusted sound absorption performance according to the simulation results, and the above adjustment and simulation analysis process is repeated based on the comparison result between the second adjusted sound absorption performance and the preset sound absorption performance, and the adjustment is stopped when the second adjusted sound absorption performance is greater than or equal to the preset sound absorption performance, or the adjustment is stopped when the second adjustment coefficient is equal to the preset coefficient.

9. An environmentally friendly muffler modeling system, characterized in that: The system includes: An acquisition module is used to obtain an initial design model of an environmentally friendly muffler; A segmentation module, connected to the acquisition module, for identifying the model structure information of the initial design model, and performing segmentation processing on the design model based on the model structure information to obtain a plurality of muffler model segments; a simulation module connected to the segmentation module, for performing simulation based on a preset throttle opening test sequence and the initial design model, obtaining a number of initial noise reduction performances corresponding to a number of muffler model segments based on the simulation results, and determining a first key model segment based on comparison results of the initial noise reduction performances; an adjustment module connected to the simulation module, for matching the first key model segment with a preset model segment in a preset model library, determining preset key design parameters based on a matching result, adjusting the preset key design parameters based on a difference between an initial sound attenuation performance corresponding to the first key model segment and a preset sound attenuation performance, obtaining a plurality of adjusted first adjusted sound attenuation performances, outputting an adjustment design model based on a comparison result between the first adjusted sound attenuation performance corresponding to the first key model segment and the preset sound attenuation performance, or determining a second key model segment; A repeating module is connected to the adjusting module and is used to adjust the preset key design parameters of the second key model section and repeat the above steps until the noise reduction performance of all key model sections reaches the preset noise reduction performance.

10. A storage medium, characterized in that: The storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the environmental muffler modeling method according to any one of claims 1 to 8 are implemented.

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