Resonant cavity throat pipe length design optimization method and system

Abstract

The invention provides a resonant cavity throat pipe length design optimization method and system. The method comprises the following steps: acquiring structural parameters of a resonant cavity; calculating the T-shaped connection correction length of the throat pipe and the main pipeline; calculating the connection correction length of the throat pipe and the resonant cavity body; and calculating the effective length of the resonant cavity throat pipe. By considering the influence of the pipe diameter of the main pipeline and the diameter of the resonant cavity, T-shaped connection correction and connection correction are calculated more accurately, the design precision of the resonant cavity is improved, the design period is shortened, and the design efficiency is improved. The method is also suitable for the design of a 1 / 4 wavelength tube, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of silencing design of automobile intake and exhaust systems, and in particular to a method and system for optimizing the design of a resonance cavity throat length. Background Art

[0002] The automobile intake and exhaust system is the air intake and exhaust device of the engine, which generates a lot of noise during the intake and exhaust process. If the noise is not attenuated by using silencer elements, it will cause environmental and social problems and endanger human health. The low-frequency resonance band noise generated by the intake and exhaust ports must be attenuated by using standard acoustic structures such as resonant cavities, so it is important to quickly design a resonant cavity that meets the requirements.

[0003] In the prior art, the design of the resonant cavity is mainly based on the calculation formula of transmission loss and center frequency. However, since the two ends of the connecting tube are not closed, the sound waves there have radiation acoustic impedance, so the actual working length of the connecting tube will increase, and the length of the connecting tube needs to be corrected.

[0004] The resonant cavity and 1 / 4 wavelength tube are commonly used anechoic structures. However, since the two ends of the connecting pipe are not closed, there is radiation acoustic impedance for the sound waves there, so the actual working length of the connecting pipe will increase, and the length of the connecting pipe needs to be corrected. In the prior art, although there are some correction formulas, these formulas do not take into account the influence of the main pipe diameter and the resonant cavity diameter. In actual engineering applications, the center frequency obtained using these correction formulas is still far from the CAE and test results, and it usually takes 4 to 5 rounds of adjustments to obtain a design that meets the target requirements. This not only increases the design cycle, but also reduces the design efficiency.

[0005] Therefore, a more accurate method for optimizing the throat length of the resonance cavity is needed to improve the efficiency and accuracy of the muffler design. Summary of the invention

[0006] The purpose of the present invention is to provide a method and system for optimizing the design of the throat length of a resonance cavity, so as to solve the problems of low precision and long design cycle of the resonance cavity in the prior art.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a method for optimizing the design of a resonance cavity throat length, comprising:

[0008] Acquire structural parameters of the resonance cavity, wherein the structural parameters include the length of the connecting pipe, the diameter of the connecting pipe, the diameter of the main pipe, and the diameter of the resonance cavity;

[0009] Calculate the T-shaped connection correction length between the throat and the main pipeline, wherein the T-shaped connection correction length is related to the connection pipe diameter and the main pipeline diameter;

[0010] Calculate the connection correction length between the throat pipe and the resonant cavity, wherein the connection correction length is related to the diameter of the connection pipe and the diameter of the resonant cavity;

[0011] The effective length of the throat of the resonance cavity is calculated based on the length of the connecting pipe, the T-connection correction length and the connection correction length.

[0012] In some embodiments of the present invention, the calculation of the T-connection correction length involves a function of the ratio of the connecting pipe diameter to the main pipe diameter.

[0013] In some embodiments of the present invention, the calculation formula of the T-shaped connection correction length LendT is:

[0014] LendT=f(Dn / Dm)×0.82132×(Dn / 2)

[0015] Where Dn is the connecting pipe diameter, Dm is the main pipe diameter, and f(Dn / Dm) is a function related to the Dn / Dm ratio.

[0016] In some embodiments of the present invention, the calculation formula of f(Dn / Dm) is:

[0017]

[0018] Among them, a1, b1, c1 and d1 are constants.

[0019] In some embodiments of the present invention, the constants a1, b1, c1, and d1 are obtained by using an interpolation fitting method through a database of transmission loss tests and CAE calculations in developed vehicle models.

[0020] In some embodiments of the invention, the calculation of the connection corrected length of the resonant cavity involves a function linked to the ratio of the diameter to the resonant cavity diameter.

[0021] In some embodiments of the present invention, the calculation formula of the connection correction length LendV is:

[0022] LendV=f(Dn / Dv)×0.82132×(Dn / 2)

[0023] Wherein, Dn is the connecting tube diameter, Dv is the resonant cavity diameter, and f(Dn / Dv) is a function related to the Dn / Dv ratio.

[0024] In some embodiments of the present invention, the calculation formula of f(Dn / Dv) is:

[0025]

[0026] Among them, a2, b2, c2 and d2 are constants.

[0027] In some embodiments of the present invention, the constants a2, b2, c2, d2 are obtained by using an interpolation fitting method through a database of transmission loss tests and CAE calculations in developed vehicle models.

[0028] In some embodiments of the present invention, the calculation formula of the effective length Leff of the throat of the resonance cavity is:

[0029] Leff=Ln+LendT+LendV

[0030] Wherein, Ln is the length of the connecting pipe, LendT is the T-connection correction length, and LendV is the connection correction length.

[0031] In a second aspect, the present invention provides a resonance cavity throat length design optimization system, comprising:

[0032] A parameter acquisition module, used to acquire structural parameters of the resonant cavity, wherein the structural parameters include the length of the connecting pipe, the diameter of the connecting pipe, the diameter of the main pipe and the diameter of the resonant cavity;

[0033] A T-connection correction calculation module, used to calculate the T-connection correction length of the throat and the main pipeline, wherein the T-connection correction length is related to the connection pipe diameter and the main pipeline diameter;

[0034] A connection correction calculation module, used to calculate the connection correction length between the throat pipe and the resonant cavity, wherein the connection correction length is related to the diameter of the connection pipe and the diameter of the resonant cavity;

[0035] The effective length calculation module is used to calculate the effective length of the throat of the resonance cavity according to the length of the connecting pipe, the T-shaped connection correction length and the connection correction length.

[0036] In some embodiments of the present invention, the calculation formula of the effective length Leff of the throat of the resonance cavity is:

[0037] Leff=Ln+LendT+LendV

[0038] Wherein, Ln is the length of the connecting pipe, LendT is the T-connection correction length, and LendV is the connection correction length.

[0039] In a third aspect, the present invention provides a method for optimizing the design of a 1 / 4 wavelength tube length, comprising:

[0040] Acquire structural parameters of the resonant cavity, wherein the structural parameters include a 1 / 4 wavelength tube length, a 1 / 4 wavelength tube diameter, and a main tube diameter;

[0041] Calculate the T-shaped connection correction length between the 1 / 4 wavelength tube and the main pipeline, wherein the T-shaped connection correction length is related to the diameter of the 1 / 4 wavelength tube and the diameter of the main pipeline;

[0042] The effective length of the 1 / 4 wavelength tube is calculated according to the 1 / 4 wavelength tube length and the T-shaped connection correction length.

[0043] In some embodiments of the present invention, the calculation of the T-connection correction length involves a function of the ratio of the 1 / 4 wavelength tube diameter to the main pipe diameter.

[0044] In some embodiments of the present invention, the calculation formula of the T-shaped connection correction length LendT is:

[0045] LendT=f(Dn / Dm)×0.82132×(Dn / 2)

[0046] Where Dn is the 1 / 4 wavelength tube diameter, Dm is the main tube diameter, and f(Dn / Dm) is a function related to the Dn / Dm ratio.

[0047] In some embodiments of the present invention, the calculation formula of f(Dn / Dm) is:

[0048]

[0049] Among them, a1, b1, c1 and d1 are constants.

[0050] In some embodiments of the present invention, the constants a1, b1, c1, and d1 are obtained by using an interpolation fitting method through a database of transmission loss tests and CAE calculations in developed vehicle models.

[0051] In some embodiments of the present invention, the calculation formula of the effective length Leff of the 1 / 4 wavelength tube is:

[0052] Leff=Ln+LendT

[0053] Where Ln is the length of the connecting pipe and LendT is the corrected length of the T-connection.

[0054] In a fourth aspect, the present invention provides a 1 / 4 wavelength tube length design optimization system, comprising:

[0055] A parameter acquisition module is used to acquire structural parameters of the resonant cavity, wherein the structural parameters include a 1 / 4 wavelength tube length, a 1 / 4 wavelength tube diameter, and a main tube diameter;

[0056] A T-shaped connection correction calculation module, used to calculate the T-shaped connection correction length between the 1 / 4 wavelength tube and the main pipeline, wherein the T-shaped connection correction length is related to the diameter of the 1 / 4 wavelength tube and the diameter of the main pipeline;

[0057] The effective length calculation module calculates the effective length of the 1 / 4 wavelength tube according to the 1 / 4 wavelength tube length and the T-shaped connection correction length.

[0058] In some embodiments of the present invention, the calculation formula of the effective length Leff of the 1 / 4 wavelength tube is:

[0059] Leff=Ln+LendT

[0060] Where Ln is the length of the connecting pipe and LendT is the corrected length of the T-connection.

[0061] The beneficial effects of the present invention are:

[0062] 1. Improved the accuracy of resonant cavity design: By considering the influence of the main pipe diameter and the resonant cavity diameter, more accurate calculations are made for T-connection corrections and connection corrections, making the calculated center frequency closer to the actual CAE and test results.

[0063] 2. Shortened design cycle: Due to the improvement of design accuracy, the number of repeated adjustments is reduced, which greatly shortens the design cycle of the resonant cavity.

[0064] 3. Improved design efficiency: The method provided by the present invention can quickly and accurately calculate the center frequency of the resonant cavity, thereby improving design efficiency.

[0065] 4. Wide applicability: The method of the present invention is not only applicable to the design of the resonant cavity, but also can be used for the design of 1 / 4 wavelength tubes, and has broad application prospects.

[0066] 5. Easy to implement: The method provided by the present invention can be implemented through software, which is easy to integrate into the existing design system and easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

[0068] Figure 1 This is a simplified diagram of the acoustic structure of the resonant cavity;

[0069] Figure 2 is a flow chart of optimization of the throat length design of the resonance cavity provided by an embodiment of the present invention;

[0070] Figure 3 is a structural block diagram of a system for designing and optimizing the throat length of a resonance cavity provided by an embodiment of the present invention;

[0071] Figure 4 This is a simplified diagram of the acoustic structure of a 1 / 4 wavelength tube.

[0072] Figure 5is a flow chart of a method for optimizing the design of a 1 / 4 wavelength tube length provided by an embodiment of the present invention;

[0073] Figure 6 It is a structural block diagram of a method for optimizing the design of a 1 / 4 wavelength tube length provided in an embodiment of the present invention;

[0074] Figure 7 is a schematic diagram of the function f(Dn / Dm) in Embodiment 7 of the present invention;

[0075] Figure 8 It is a schematic diagram of the function f(Dn / Dv) in Example 7 of the present invention. DETAILED DESCRIPTION

[0076] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0077] Example 1: Method for optimizing the design of the throat length of the resonance cavity

[0078] like Figure 1 and Figure 2 As shown, the method for optimizing the design of the throat length of the resonance cavity provided by the embodiment of the present invention includes:

[0079] Step S101: Acquire the structural parameters of the resonant cavity.

[0080] In this step, the structural parameters of the resonant cavity are obtained, including the connecting pipe length Ln, the connecting pipe diameter Dn, the main pipe diameter Dm and the resonant cavity diameter Dv. These parameters are the basic data for the resonant cavity design and are crucial for subsequent calculations.

[0081] Step S102: Calculate the T-shaped connection correction length between the throat pipe and the main pipe.

[0082] In this step, the T-shaped connection correction length LendT between the throat and the main pipeline is calculated. The T-shaped connection correction length is related to the connection pipe diameter Dn and the main pipeline diameter Dm. The specific calculation formula is:

[0083] LendT=f(Dn / Dm)×0.82132×(Dn / 2)

[0084] Among them, f(Dn / Dm) is a function related to the Dn / Dm ratio. The specific form of this function is:

[0085]

[0086] Among them, a1, b1, c1 and d1 are constants. The values ​​of these constants are obtained by analyzing the transmission loss test and CAE calculation database in the developed models and using the interpolation fitting method. This method ensures that the calculation results are highly consistent with the actual situation.

[0087] Step S103: Calculate the connection correction length between the throat and the resonant cavity.

[0088] In this step, the connection correction length LendV between the throat and the resonant cavity is calculated. The connection correction length is related to the connection pipe diameter Dn and the resonant cavity diameter Dv. The specific calculation formula is:

[0089] LendV=f(Dn / Dv)×0.82132×(Dn / 2)

[0090] Among them, f(Dn / Dv) is a function related to the Dn / Dv ratio. The specific form of this function is:

[0091]

[0092] Among them, a2, b2, c2 and d2 are constants. The values ​​of these constants are also obtained by analyzing the transmission loss test and CAE calculation database in the developed models and using the interpolation fitting method.

[0093] Step S104: Calculate the effective length of the throat of the resonance cavity.

[0094] In this step, the effective length Leff of the throat of the resonance cavity is calculated according to the connecting pipe length Ln, the T-shaped connection correction length LendT and the connection correction length LendV. The specific calculation formula is:

[0095] Leff=Ln+LendT+LendV

[0096] This formula takes into account the actual length of the connecting pipe and the corrected lengths at both ends, thereby obtaining a more accurate effective length of the resonance cavity throat.

[0097] Through the above steps, the resonance cavity throat length design optimization method provided in this embodiment can more accurately calculate the effective length of the resonance cavity throat, thereby improving the design accuracy of the resonance cavity and shortening the design cycle.

[0098] Example 2: Resonance cavity throat length design optimization system

[0099] Figure 3 : is a structural block diagram of a system for optimizing the length of a resonant cavity throat provided by an embodiment of the present invention. Figure 3 As shown, the system includes the following modules:

[0100] Parameter acquisition module 201: used to acquire the structural parameters of the resonance cavity, including the connecting pipe length Ln, the connecting pipe diameter Dn, the main pipe diameter Dm and the resonance cavity diameter Dv.

[0101] T-connection correction calculation module 202: used to calculate the T-connection correction length LendT between the throat pipe and the main pipe. This module implements the function of step S102 in the first embodiment.

[0102] The connection correction calculation module 203 is used to calculate the connection correction length LendV between the throat and the resonant cavity. This module implements the function of step S103 in the first embodiment.

[0103] The effective length calculation module 204 is used to calculate the effective length Leff of the throat of the resonance cavity according to the connecting pipe length Ln, the T-shaped connection correction length LendT and the connection correction length LendV. This module implements the function of step S104 in the first embodiment.

[0104] The system in this embodiment realizes accurate calculation and optimized design of the throat length of the resonance cavity through the coordinated work of various functional modules. The modular design of the system makes each calculation step clear and easy to implement and maintain.

[0105] Example 3: 1 / 4 wavelength tube length design optimization method

[0106] like Figure 4 and Figure 5 As shown, the 1 / 4 wavelength tube length design optimization method provided in Embodiment 3 of the present invention comprises the following steps:

[0107] Step S301: Obtaining structural parameters of a 1 / 4 wavelength tube.

[0108] In this step, the structural parameters of the quarter-wavelength tube are obtained, including the quarter-wavelength tube length Ln, the quarter-wavelength tube diameter Dn and the main tube diameter Dm. These parameters are the basic data for the quarter-wavelength tube design.

[0109] Step S302: Calculate the corrected length of the T-shaped connection between the 1 / 4 wavelength tube and the main pipeline.

[0110] In this step, the T-shaped connection correction length LendT between the 1 / 4 wavelength tube and the main pipeline is calculated. The T-shaped connection correction length is related to the 1 / 4 wavelength tube diameter Dn and the main pipeline diameter Dm. The specific calculation formula is:

[0111] LendT=f(Dn / Dm)×0.82132×(Dn / 2)

[0112] Among them, f(Dn / Dm) is a function related to the Dn / Dm ratio. The specific form of this function is:

[0113]

[0114] Among them, a1, b1, c1 and d1 are constants. The values ​​of these constants are obtained by analyzing the transmission loss test and CAE calculation database in the developed model and using the interpolation fitting method.

[0115] Step S303: Calculate the effective length of the 1 / 4 wavelength tube.

[0116] In this step, the effective length Leff of the 1 / 4 wavelength tube is calculated according to the 1 / 4 wavelength tube length Ln and the T-shaped connection correction length LendT. The specific calculation formula is:

[0117] Leff=Ln+LendT

[0118] This formula takes into account the actual length of the 1 / 4 wavelength tube and the corrected length of the T-connection, thereby obtaining a more accurate effective length of the 1 / 4 wavelength tube.

[0119] Through the above steps, the quarter-wavelength tube length design optimization method provided in this embodiment can more accurately calculate the effective length of the quarter-wavelength tube, thereby improving the design accuracy of the quarter-wavelength tube and shortening the design cycle.

[0120] Example 4: 1 / 4 wavelength tube length design optimization system

[0121] Figure 6 It is a structural block diagram of a 1 / 4 wavelength tube length design optimization system provided in Example 4 of the present invention.

[0122] like Figure 4 As shown, the system includes the following modules:

[0123] Parameter acquisition module 401: used to acquire structural parameters of the 1 / 4 wavelength tube, including the 1 / 4 wavelength tube length Ln, the 1 / 4 wavelength tube diameter Dn and the main tube diameter Dm.

[0124] T-shaped connection correction calculation module 402: used to calculate the T-shaped connection correction length LendT between the 1 / 4 wavelength tube and the main pipe. This module implements the function of step S302 in embodiment 3.

[0125] The effective length calculation module 403 is used to calculate the effective length Leff of the 1 / 4 wavelength tube according to the 1 / 4 wavelength tube length Ln and the T-shaped connection correction length LendT. This module implements the function of step S303 in the third embodiment.

[0126] The system in this embodiment realizes accurate calculation and optimal design of the 1 / 4 wavelength tube length through the coordinated work of various functional modules. The modular design of the system makes each calculation step clear and easy to implement and maintain.

[0127] Example 5: Specific application of the method for optimizing the length of the throat of the resonance cavity

[0128] This embodiment will explain in detail the specific steps and numerical calculation process of the resonance cavity throat length design optimization method in embodiment 1 in practical application.

[0129] Assume that we have a resonant cavity with the following structural parameters:

[0130] Connection pipe length Ln = 250 mm

[0131] Connecting pipe diameter Dn = 40mm

[0132] Connecting pipe cross-sectional area An = 1256.6 mm 2

[0133] Main pipe diameter Dm = 48.6 mm

[0134] Resonance cavity diameter Dv = 136.6 mm

[0135] Resonance cavity volume V = 2L

[0136] Speed ​​of sound c = 343.2 m / s

[0137] Through CAE simulation, it is found that the sound elimination frequency of the resonance cavity is fc=83.6Hz.

[0138] Step 1: Obtain the structural parameters of the resonant cavity

[0139] The required structural parameters are obtained from the above parameters.

[0140] Step 2: Calculate the corrected length LendT of the T-connection between the throat and the main pipeline

[0141] LendT=f(Dn / Dm)×0.82132×(Dn / 2)=8.20mm

[0142] Step 3: Calculate the corrected length LendV between the throat and the resonant cavity

[0143] LendV=f(Dn / Dv)×0.82132×(Dn / 2)=10.41mm

[0144] Step 4: Calculate the effective length Leff of the throat of the resonant cavity

[0145] Leff=Ln+LendT+LendV=250+8.20+10.41=268.62mm

[0146] Calculate the corrected anechoic frequency

[0147]

[0148] The silencing frequency obtained by the present invention is very close to that obtained by CAE simulation, thus greatly improving the efficiency.

[0149] Example 6

[0150] This embodiment will explain in detail the specific steps and numerical calculation process of the 1 / 4 wavelength tube length design optimization method in embodiment 3 in practical application.

[0151] Suppose we have a 1 / 4 wavelength tube with the following structural parameters:

[0152] 1 / 4 wavelength tube length Ln = 105mm

[0153] 1 / 4 wavelength tube diameter Dn = 30mm

[0154] 1 / 4 wavelength tube cross-sectional area A = 706.8 mm2

[0155] Main pipe diameter D = 65mm

[0156] Speed ​​of sound c = 343.2 m / s

[0157] Through CAE simulation, it is found that the sound elimination frequency of the resonance cavity is fc=748.6Hz.

[0158] Step 1: Obtain the structural parameters of the 1 / 4 wavelength tube

[0159] The required structural parameters are obtained from the above parameters.

[0160] Step 2: Calculate the corrected length LendT of the T-shaped connection between the 1 / 4 wavelength tube and the main pipeline

[0161] LendT=f(Dn / Dm)×0.82132×(Dn / 2)=8.86mm

[0162] Step 3: Calculate the effective length Leff of the 1 / 4 wavelength tube

[0163] Leff=Ln+LendT=113.86mm

[0164] Calculate the corrected anechoic frequency

[0165] fc=1 / 4×(c / Leff)=753.55Hz

[0166] The silencing frequency obtained by the present invention is very close to that obtained by CAE simulation, thus greatly improving the efficiency.

[0167] Example 7: Constant determination method

[0168] In the previous embodiment, we used multiple sets of constants (a1, b1, c1, d1) and (a2, b2, c2, d2). This embodiment will explain in detail how to obtain these constants by using the interpolation fitting method through the transmission loss test and CAE calculation database in the developed vehicle model.

[0169] Step 1: Correction formula establishment

[0170] In 1945, King, LV made the following corrections to the throat length of the 1 / 4 wavelength tube and the resonant cavity through experiments:

[0171] For a 1 / 4 wavelength tube, ΔL = 0.82132 × (Dn / 2);

[0172] For the resonant cavity, ΔL=0.82132×Dn.

[0173] In the above formula, Dn is the throat diameter. However, in the actual application of the acoustic structure design of the automobile intake and exhaust system, it is found that the diameter of the main pipe Dm and the diameter of the resonant cavity Dv also have an impact on the muffler frequency. In order to consider this influence, the following correction formula is established:

[0174] For T-connections between pipes and main pipes

[0175] LendT=f(Dn / Dm)×0.82132×(Dn / 2)

[0176] For the connection between the throat and the resonant cavity

[0177] LendV=f(Dn / Dv)×0.82132×(Dn / 2)

[0178] Step 2: Collect Data

[0179] First, we need to collect a large amount of data on developed models. This data includes:

[0180] The actual geometric parameters of the resonant cavity or 1 / 4 wavelength tube, such as the length and diameter of the connecting tube;

[0181] The anechoic frequency f obtained by actual vehicle testing or CAE calculation c .

[0182] Step 32: Data Preprocessing

[0183] The collected data is preprocessed, including outlier detection and data standardization, to ensure data quality.

[0184] Step 4: Obtain the formula for f(Dn / Dm)

[0185] According to the structural parameters of the 1 / 4 wavelength tube obtained in step 2-3, and the anechoic frequency f c , combined with the 1 / 4 wavelength tube anechoic frequency calculation formula f c =1 / 4×(c / (Ln+LendT)) can obtain the value of LendT and form a database. Figure 7 As shown, according to the database, the formula for f(Dn / Dm) can be obtained by the difference fitting method as follows:

[0186]

[0187] Step 5: Obtain the formula for f(Dn / Dv)

[0188] The calculation formula of the anechoic frequency of the resonant cavity is as follows:

[0189]

[0190] ΔL=LendT+LendV

[0191] According to the structural parameters and anechoic frequency of the resonant cavity obtained in step 2-3 and the T-connection formula LendT obtained in step 4, the value of LendV can be obtained and a database can be formed. Figure 8 As shown, according to the database, the formula for f(Dn / Dv) can be obtained by the difference fitting method as follows:

[0192]

[0193] It is important to note that these constants may need to be updated periodically, especially when new vehicle model data is added. Regular updates and optimizations can ensure that the calculation method remains highly accurate.

[0194] Through the above embodiments, we have introduced in detail the design optimization methods and systems for the throat length of the resonant cavity and the 1 / 4 wavelength tube length. These methods and systems take into account the correction effect of the T-shaped connection and the resonant cavity connection, and can more accurately calculate the effective length, thereby improving the design accuracy and shortening the design cycle.

[0195] The advantages of the present invention are mainly reflected in the following aspects:

[0196] 1. High precision: By introducing the T-shaped connection correction length and the connection correction length, this method can more accurately calculate the effective length of the resonant cavity throat and the 1 / 4 wavelength tube, which is closer to the actual situation than the traditional method.

[0197] 2. Flexibility: This method is applicable to resonant cavities and 1 / 4 wavelength tubes of different sizes and proportions, and has good versatility and flexibility.

[0198] 3. Data-driven: By utilizing a large amount of data from developed vehicle models and using interpolation fitting methods to determine key constants, the calculation results are more reliable and accurate.

[0199] 4. Easy to implement: The present invention provides clear calculation steps and formulas, which are easy to implement and apply in practical engineering.

[0200] 5. Shorten the design cycle: Since the calculation results are more accurate, the repeated modifications and experiments in the design process can be reduced, thereby significantly shortening the design cycle.

[0201] 6. Cost-effectiveness: By improving design accuracy and shortening the design cycle, this method can effectively reduce development costs and improve economic benefits.

[0202] In general, the design optimization method and system of the throat length of the resonance cavity and the 1 / 4 wavelength tube length provided by the present invention can effectively solve the problems of low precision and long design cycle of the resonance cavity design in the prior art. It can not only improve the design efficiency, but also provide engineers with more accurate design references, which is of great significance for improving the performance of automobile mufflers.

[0203] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A method for optimizing the design of the throat length of a resonance cavity, characterized in that: include: Acquire structural parameters of the resonance cavity, wherein the structural parameters include the length of the connecting pipe, the diameter of the connecting pipe, the diameter of the main pipe, and the diameter of the resonance cavity; Calculate the T-shaped connection correction length between the throat and the main pipeline, wherein the T-shaped connection correction length is related to the connection pipe diameter and the main pipeline diameter; Calculate the connection correction length between the throat pipe and the resonant cavity, wherein the connection correction length is related to the diameter of the connection pipe and the diameter of the resonant cavity; The effective length of the throat of the resonance cavity is calculated based on the length of the connecting pipe, the T-connection correction length and the connection correction length.

2. The method for optimizing the design of the throat length of the resonance cavity according to claim 1, characterized in that: The calculation of the T-connection correction length involves a function of the ratio of the connecting pipe diameter to the main pipe diameter.

3. The method for optimizing the design of the throat length of the resonance cavity according to claim 2, characterized in that: The calculation formula of the T-shaped connection correction length LendT is: LendT=f(Dn / Dm)×0.82132×(Dn / 2) Where Dn is the connecting pipe diameter, Dm is the main pipe diameter, and f(Dn / Dm) is a function related to the Dn / Dm ratio; The calculation formula of f(Dn / Dm) is: Among them, a1, b1, c1 and d1 are constants.

4. The method for optimizing the design of the throat length of the resonance cavity according to claim 3, characterized in that: The constants a1, b1, c1, and d1 are obtained by using an interpolation fitting method through a database of transmission loss tests and CAE calculations in developed models.

5. The method for optimizing the design of the throat length of the resonance cavity according to claim 1, characterized in that: The calculation of the connection correction length of the resonant cavity cavity involves a function of the ratio of the connection diameter to the resonant cavity diameter.

6. The method for optimizing the design of the throat length of the resonance cavity according to claim 5, characterized in that: The calculation formula of the connection correction length LendV is: LendV=f(Dn / Dv)×0.82132×(Dn / 2) Where Dn is the diameter of the connecting tube, Dv is the diameter of the resonant cavity, and f(Dn / Dv) is a function related to the ratio of Dn / Dv; The calculation formula of f(Dn / Dv) is: Among them, a2, b2, c2 and d2 are constants.

7. The method for optimizing the length of the throat of the resonance cavity according to claim 6, characterized in that: The constants a2, b2, c2, and d2 are obtained by using an interpolation fitting method through a database of transmission loss tests and CAE calculations in developed models.

8. A system using the method for optimizing the length of the throat of a resonance cavity according to any one of claims 1 to 7, comprising: A parameter acquisition module, used to acquire structural parameters of the resonant cavity, wherein the structural parameters include the length of the connecting pipe, the diameter of the connecting pipe, the diameter of the main pipe and the diameter of the resonant cavity; A T-connection correction calculation module, used to calculate the T-connection correction length of the throat and the main pipeline, wherein the T-connection correction length is related to the connection pipe diameter and the main pipeline diameter; A connection correction calculation module, used to calculate the connection correction length between the throat pipe and the resonant cavity, wherein the connection correction length is related to the diameter of the connection pipe and the diameter of the resonant cavity; The effective length calculation module is used to calculate the effective length of the throat of the resonance cavity according to the length of the connecting pipe, the T-shaped connection correction length and the connection correction length.

9. A 1 / 4 wavelength tube length design optimization method, characterized in that: include: Acquire structural parameters of the resonant cavity, wherein the structural parameters include a 1 / 4 wavelength tube length, a 1 / 4 wavelength tube diameter, and a main tube diameter; Calculate the T-shaped connection correction length between the 1 / 4 wavelength tube and the main pipeline, wherein the T-shaped connection correction length is related to the diameter of the 1 / 4 wavelength tube and the diameter of the main pipeline; The effective length of the 1 / 4 wavelength tube is calculated according to the 1 / 4 wavelength tube length and the T-shaped connection correction length.

10. The method for optimizing the length design of a quarter-wavelength tube according to claim 9, characterized in that: The calculation formula of the T-shaped connection correction length LendT is: LendT=f(Dn / Dm)×0.82132×(Dn / 2) Where Dn is the 1 / 4 wavelength tube diameter, Dm is the main tube diameter, and f(Dn / Dm) is a function related to the Dn / Dm ratio.

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