Modeling method and system of acoustic cavity for whole vehicle NVH mid-frequency analysis and storage medium

Abstract

The application discloses a modeling method and system of an acoustic cavity in whole vehicle NVH medium frequency analysis and a storage medium, and comprises the following steps: vehicle body structure screening, CAS data screening, acoustic cavity blocking, acoustic cavity modeling, acoustic cavity separation and connection, and acoustic cavity material attribute assignment. The acoustic cavity model established by the method is closer to the actual situation, can be used for early medium frequency NVH performance analysis, and the simulation result has high accuracy.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automobile NVH, and particularly relates to a modeling method and system of an acoustic cavity for whole vehicle NVH mid-frequency analysis and a storage medium. BACKGROUND

[0002] With the wide development of electric vehicles, the automobile NVH performance has become one of the important manifestations of the competitiveness of automobiles, and how to effectively predict the automobile NVH performance in the early stage of automobile development has become one of the main research directions of major automobile enterprises. At present, the finite element method (FEA) is widely used for predicting the low-frequency (<150Hz) NVH performance of automobiles, and the statistical energy method (SEA) is widely used for predicting the high-frequency (>600Hz) NVH performance of automobiles, while there are various methods for predicting and improving the mid-frequency (150Hz-600Hz) NVH performance. One of the indispensable steps in most existing methods is acoustic cavity modeling.

[0003] The low-frequency NVH performance is mainly affected by the coupling of the acoustic cavity and the body panel modal, so the modeling of the acoustic cavity should reflect the coupling of the acoustic cavity and the panel as much as possible, and reflect the dynamic characteristics of the body structure and the acoustic cavity in the vehicle. Different from the low-frequency NVH, the mid-frequency NVH not only considers the coupling effect of the acoustic cavity and the panel, but also considers the sound insulation of the acoustic package in the vehicle, so the acoustic cavity modeling should consider the distribution of the body panel structure and the acoustic package in the vehicle. The modeling method of the acoustic cavity in the vehicle based on the inner CAS disclosed in the patent document CN109657351A takes the inner CAS as the boundary of the acoustic cavity, and does not consider the acoustic cavity between the inner panel and the outer panel of the back door, and does not consider the influence of the acoustic package in the vehicle on the acoustic cavity modeling. Therefore, in order to ensure the high accuracy of the early mid-frequency NVH prediction result, accurate modeling of the acoustic cavity is necessary in the mid-frequency NVH performance simulation stage. SUMMARY

[0004] The purpose of the present application is to provide a modeling method and system of an acoustic cavity for whole vehicle NVH mid-frequency analysis and a storage medium, which can make the established acoustic cavity closer to the actual situation.

[0005] In the first aspect, the modeling method of an acoustic cavity for whole vehicle NVH mid-frequency analysis comprises the following steps:

[0006] Body structure screening: screening out the panel and glass in direct contact with the air in the interior body model which has been modeled;

[0007] CAS data screening: screening out the front door inner CAS data, the rear door inner CAS data, the instrument table inner CAS data, the central control inner CAS data, the rear hub package inner CAS data and the seat outer CAS data;

[0008] Sound cavity block: the whole sound cavity model is blocked, which is divided into front door outside sound cavity, rear door outside sound cavity, front door inside sound cavity, rear door inside sound cavity, back door outside sound cavity, rear hub bag inside sound cavity, rear hub bag outside sound cavity, central control instrument panel sound cavity, spare tire pool sound cavity, front seat sound cavity, rear seat sound cavity and passenger cabin sound cavity;

[0009] Sound cavity modeling: the front door outside sound cavity, the rear door outside sound cavity, the front door inside sound cavity, the rear door inside sound cavity, the back door outside sound cavity, the rear hub bag inside sound cavity, the rear hub bag outside sound cavity, the central control instrument panel sound cavity, the spare tire pool sound cavity, the front seat sound cavity, the rear seat sound cavity and the passenger cabin sound cavity are established;

[0010] Sound cavity separation and connection: the established sound cavities are separated, that is, no common node between two sound cavities, and then the sound cavities are connected according to the interior body structure and the distribution of the acoustic package;

[0011] Assigning sound cavity material properties to the connected sound cavities.

[0012] Optionally, in the vehicle body structure screening, the sheet metal and glass directly contacted with the air in the vehicle are screened out, including the front windshield, the water channel, the front wall plate, the side wall, the A column inner sheet metal, the B column inner sheet metal, the rear inner hub bag, the rear outer hub bag, the front door inner sheet metal, the front door outer sheet metal, the front door glass, the rear door inner sheet metal, the rear door outer sheet metal, the rear door glass, the back door inner sheet metal, the back door outer sheet metal, the back door glass, the roof, the sunroof, the floor, and the sheet metal between the parts.

[0013] Optionally, in the sound cavity modeling,

[0014] The front door outside sound cavity is surrounded by the front door outside sheet metal and the front door inside sheet metal;

[0015] The rear door outside sound cavity is surrounded by the rear door outside sheet metal and the rear door inside sheet metal;

[0016] The front door inside sound cavity is surrounded by the front door inside sheet metal and the front door inside CAS data package;

[0017] The rear door inside sound cavity is surrounded by the rear door inside sheet metal and the rear door inside CAS data package;

[0018] The back door outside sound cavity is surrounded by the back door outside sheet metal and the back door inside sheet metal;

[0019] The rear hub bag inside sound cavity is surrounded by the rear inner hub bag sheet metal and the rear hub bag inside CAS data package;

[0020] The rear hub bag outside sound cavity is surrounded by the rear inner hub bag sheet metal, the rear outer hub bag sheet metal and the rear side wall;

[0021] The center console acoustic cavity is surrounded by the center console inner CAS data, the center console inner CAS data, the front floor panel, the front wall panel, and the A-pillar inner panel;

[0022] The spare tire well acoustic cavity is surrounded by the spare tire well cover plate, the rear hub package inner CAS data, and the rear floor panel;

[0023] The front row seat acoustic cavity is surrounded by the front row seat outer CAS data;

[0024] The rear row seat acoustic cavity is surrounded by the rear row seat outer CAS data;

[0025] The passenger compartment acoustic cavity is surrounded by the boundaries of the above acoustic cavities, the front windshield, the roof, the sunroof, the front door glass, the rear door glass, and the rear floor.

[0026] Optionally, the acoustic cavity connection includes:

[0027] Connection 1: The center console acoustic cavity and the passenger compartment acoustic cavity are connected above the main driver and the co-driver pedal positions, and are locally co-nodes;

[0028] Connection 2: The front door inner acoustic cavity and the front door outer acoustic cavity are connected at the front door inner panel mounting hole, and are locally co-nodes;

[0029] Connection 3: The rear door inner acoustic cavity and the rear door outer acoustic cavity are connected at the front door inner panel mounting hole, and are locally co-nodes;

[0030] Connection 4: The front door inner acoustic cavity and the passenger compartment are connected at the sound installation position, and are locally co-nodes;

[0031] Connection 5: The rear door inner acoustic cavity and the passenger compartment are connected at the sound installation position, and are locally co-nodes;

[0032] Connection 6: The back door acoustic cavity and the passenger compartment are connected at the contact surface, and the contact surface is a whole co-node;

[0033] Connection 7: The rear row seat is installed in the form that the rear row seat bowl directly contacts the rear floor through buckles, and the bottom of the rear row seat acoustic cavity shares a unit cell with the passenger compartment, and the remaining positions share nodes with the contact surface of the passenger compartment;

[0034] Connection 8: The front row seat and the passenger compartment contact surface share nodes;

[0035] Connection 9: The rear hub package inner acoustic cavity and the passenger compartment acoustic cavity are connected at the sound, and are locally co-nodes;

[0036] Connection 10: The rear hub package inner acoustic cavity and the spare tire well acoustic cavity are connected at the left and right sides of the spare tire well acoustic cavity, and are locally co-nodes;

[0037] Connection 11: The rear hub package inner acoustic cavity and the rear hub package outer acoustic cavity are connected at the panel hole, and are locally co-nodes.

[0038] In a second aspect, the application provides a modeling method of an acoustic cavity for whole vehicle NVH mid-frequency analysis, comprising a controller and a memory, wherein the memory stores a computer readable program, and the computer readable program, when invoked, can execute the steps of the modeling method of the acoustic cavity for whole vehicle NVH mid-frequency analysis.

[0039] In a third aspect, the application provides a storage medium, wherein the storage medium stores a computer readable program, and the computer readable program, when invoked, can execute the steps of the modeling method of the acoustic cavity for whole vehicle NVH mid-frequency analysis.

[0040] The modeling method of the acoustic cavity for whole vehicle NVH mid-frequency analysis has the following advantages: the modeling method of the acoustic cavity for whole vehicle NVH mid-frequency analysis not only considers the coupling effect of the acoustic cavity and the sheet metal, but also considers the sound propagation path in the air, and considers the influence of the acoustic package and the sheet metal structure on the connection of each sub-acoustic cavity. The acoustic cavity model established by the method is closer to the actual situation, can be used for early mid-frequency NVH performance analysis, and the simulation result has high accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is the modeling flowchart of the embodiment. DETAILED DESCRIPTION

[0042] The application will be described in detail below with reference to the accompanying drawings.

[0043] As shown in Figure 1 , the modeling method of the acoustic cavity for whole vehicle NVH mid-frequency analysis comprises the following steps:

[0044] Vehicle body structure screening:

[0045] In the completed interior body model, the sheet metal and glass directly contacted with the air in the vehicle are screened out, mainly including the front windshield, the water channel, the front wall plate, the side wall, the A-pillar inner sheet metal, the B-pillar inner sheet metal, the rear inner hub package, the rear outer hub package, the front door inner sheet metal, the front door outer sheet metal, the front door glass, the rear door inner sheet metal, the rear door outer sheet metal, the rear door glass, the back door inner sheet metal, the back door outer sheet metal, the back door glass, the roof, the floor and the like, and the larger sheet metal parts therebetween.

[0046] CAS data screening:

[0047] The front door inner CAS data, the rear door inner CAS data, the instrument panel inner CAS data, the center control inner CAS data, the rear hub package inner CAS data and the seat outer CAS data are screened out.

[0048] Acoustic cavity blocking:

[0049] The whole acoustic cavity model is divided into blocks to facilitate modeling and connection / separation between acoustic cavities, and is divided into a front door outer acoustic cavity, a rear door outer acoustic cavity, a front door inner acoustic cavity, a rear door inner acoustic cavity, a back door outer acoustic cavity, a rear hub bag inner acoustic cavity, a rear hub bag outer acoustic cavity, a central control panel acoustic cavity, a spare tire pool acoustic cavity, a front seat acoustic cavity, a rear seat acoustic cavity, and a passenger cabin acoustic cavity.

[0050] Acoustic cavity modeling:

[0051] The front door outer acoustic cavity, the rear door outer acoustic cavity, the front door inner acoustic cavity, the rear door inner acoustic cavity, the back door outer acoustic cavity, the rear hub bag inner acoustic cavity, the rear hub bag outer acoustic cavity, the central control panel acoustic cavity, the spare tire pool acoustic cavity, the front seat acoustic cavity, the rear seat acoustic cavity, and the passenger cabin acoustic cavity are established.

[0052] The front door outer acoustic cavity is surrounded by a front door outer panel and a front door inner panel.

[0053] The rear door outer acoustic cavity is surrounded by a rear door outer panel and a rear door inner panel.

[0054] The front door inner acoustic cavity is surrounded by a front door inner panel and a front door inner CAS data.

[0055] The rear door inner acoustic cavity is surrounded by a rear door inner panel and a rear door inner CAS data.

[0056] The back door outer acoustic cavity is surrounded by a back door outer panel and a back door inner panel.

[0057] The rear hub bag inner acoustic cavity is surrounded by a rear inner hub bag panel and a rear hub bag inner CAS data.

[0058] The rear hub bag outer acoustic cavity is surrounded by a rear inner hub bag panel, a rear outer hub bag panel, and a rear quarter panel.

[0059] The central control panel acoustic cavity is surrounded by an instrument panel inner CAS data, a central control inner CAS data, a front floor panel, a front wall panel, and an A-pillar inner panel.

[0060] The spare tire pool acoustic cavity is surrounded by a spare tire pool cover plate, a rear hub bag inner CAS data, and a rear floor panel.

[0061] The front seat acoustic cavity is surrounded by a front seat outer CAS data.

[0062] The rear seat acoustic cavity is surrounded by a rear seat outer CAS data.

[0063] The passenger cabin acoustic cavity is surrounded by the boundaries of the above acoustic cavities, a front windshield, a roof, a sunroof, a front door glass, a rear door glass, and a rear floor.

[0064] In this embodiment, each acoustic cavity adopts a tetrahedral unit.

[0065] Separation and connection of acoustic cavities: the built acoustic cavities are separated, that is, no node is shared between two acoustic cavities, and then the acoustic cavities are connected according to the interior body structure and the distribution of acoustic packs.

[0066] The acoustic cavity connection includes:

[0067] Connection 1: The center console acoustic cavity and the passenger compartment acoustic cavity are connected above the footrest positions of the main driver and the co-driver, and share a node locally.

[0068] Connection 2: The front door inner acoustic cavity and the front door outer acoustic cavity are connected at the front door inner metal mounting hole, and share a node locally.

[0069] Connection 3: The rear door inner acoustic cavity and the rear door outer acoustic cavity are connected at the front door inner metal mounting hole, and share a node locally.

[0070] Connection 4: The front door inner acoustic cavity and the passenger compartment are connected at the sound installation position, and share a node locally.

[0071] Connection 5: The rear door inner acoustic cavity and the passenger compartment are connected at the sound installation position, and share a node locally.

[0072] Connection 6: The back door acoustic cavity and the passenger compartment are connected at the contact surface, and share a node at the contact surface.

[0073] Connection 7: The rear seat is installed in the form that the rear seat bowl directly contacts the rear floor through buckles, and the bottom of the rear seat acoustic cavity shares a unit cell with the passenger compartment, and the remaining positions share nodes with the passenger compartment at the contact surface.

[0074] Connection 8: The front seat shares a node with the passenger compartment at the contact surface.

[0075] Connection 9: The rear hub package inner acoustic cavity and the passenger compartment acoustic cavity are connected at the sound, and share a node locally.

[0076] Connection 10: The rear hub package inner acoustic cavity and the spare tire pool acoustic cavity are connected at the left and right sides of the spare tire pool acoustic cavity, and share a node locally.

[0077] Connection 11: The rear hub package inner acoustic cavity and the rear hub package outer acoustic cavity are connected at the metal hole, and share a node locally.

[0078] Assigning material properties to acoustic cavities, assigning materials to the connected acoustic cavities.

[0079] The method not only considers the coupling effect of acoustic cavities and metal, but also considers the sound propagation path in air, and considers the influence of acoustic packs and metal structures in the connection of each sub-acoustic cavity. The acoustic cavities generated by the modeling method are closer to the actual situation.

[0080] In the embodiment, a modeling method of an acoustic cavity for vehicle NVH mid-frequency analysis includes a controller and a memory, the memory stores a computer readable program, and the computer readable program can execute steps of the modeling method of the acoustic cavity for vehicle NVH mid-frequency analysis when called.

[0081] In the embodiment, a storage medium stores a computer readable program, and the computer readable program can execute steps of the modeling method of the acoustic cavity for vehicle NVH mid-frequency analysis when called.

[0082] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above embodiments, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application should be equivalent replacement methods, and all are included in the protection scope of the present application.

Claims

1. A method of modeling an acoustic cavity for full vehicle NVH mid-frequency analysis, the method comprising: The method comprises the following steps: ​ Body structure screening: in the completed interior body model, the sheet metal and glass directly contacted with the air in the vehicle are screened out; CAS data screening: the front door inner CAS data, the rear door inner CAS data, the instrument panel inner CAS data, the center control inner CAS data, the rear hub package inner CAS data and the seat outer CAS data are screened out; Sound cavity blocking: the whole sound cavity model is blocked into the front door outer sound cavity, the rear door outer sound cavity, the front door inner sound cavity, the rear door inner sound cavity, the back door outer sound cavity, the rear hub package inner sound cavity, the rear hub package outer sound cavity, the center control instrument panel sound cavity, the spare tire pool sound cavity, the front seat sound cavity, the rear seat sound cavity and the passenger cabin sound cavity; Sound cavity modeling: the front door outer sound cavity, the rear door outer sound cavity, the front door inner sound cavity, the rear door inner sound cavity, the back door outer sound cavity, the rear hub package inner sound cavity, the rear hub package outer sound cavity, the center control instrument panel sound cavity, the spare tire pool sound cavity, the front seat sound cavity, the rear seat sound cavity and the passenger cabin sound cavity are established; in the sound cavity modeling, the front door outer sound cavity is surrounded by the front door outer sheet metal and the front door inner sheet metal; the rear door outer sound cavity is surrounded by the rear door outer sheet metal and the rear door inner sheet metal; the front door inner sound cavity is surrounded by the front door inner sheet metal and the front door inner CAS data; the rear door inner sound cavity is surrounded by the rear door inner sheet metal and the rear door inner CAS data; the back door outer sound cavity is surrounded by the back door outer sheet metal and the back door inner sheet metal; the rear hub package inner sound cavity is surrounded by the rear inner hub package sheet metal and the rear hub package inner CAS data; the rear hub package outer sound cavity is surrounded by the rear inner hub package sheet metal, the rear outer hub package sheet metal and the rear quarter panel; the center control instrument panel sound cavity is surrounded by the instrument panel inner CAS data, the center control inner CAS data, the front floor sheet metal, the front wall sheet metal and the A-pillar inner sheet metal; the spare tire pool sound cavity is surrounded by the spare tire pool cover plate, the rear hub package inner CAS data and the rear floor sheet metal; the front seat sound cavity is surrounded by the front seat outer CAS data; the rear seat sound cavity is surrounded by the rear seat outer CAS data; the passenger cabin sound cavity is surrounded by the boundaries of the above sound cavities, the front windshield, the roof, the sunroof, the front door glass, the rear door glass and the rear floor; Sound cavity separation and connection: the established sound cavities are separated, that is, there is no common node between two sound cavities, and then the sound cavities are connected according to the distribution of the interior body structure and the acoustic package; wherein the sound cavity connection comprises: Connection 1: the center control instrument panel sound cavity and the passenger cabin sound cavity are connected above the main driver and the co-driver pedal positions, and locally share nodes; Connection 2: the front door inner sound cavity and the front door outer sound cavity are connected at the front door inner sheet metal mounting hole, and locally share nodes; Connection 3: the rear door inner sound cavity and the rear door outer sound cavity are connected at the front door inner sheet metal mounting hole, and locally share nodes; Connection 4: the front door inner sound cavity and the passenger cabin are connected at the audio installation position, and locally share nodes; Connection 5: the rear door inner sound cavity and the passenger cabin are connected at the audio installation position, and locally share nodes; Connection 6: the back door sound cavity and the passenger cabin are connected at the contact surface, and the contact surface shares nodes as a whole. Connection 7: The rear seat is mounted in a way that the seat pan is directly contacted with the rear floor by buckling, the bottom of the rear seat cavity shares a cell with the passenger compartment, and the rest of the contact surface shares a node with the passenger compartment; Connection 8: The front seat shares a node with the passenger compartment at the contact surface; Connection 9: The rear hub package inner cavity and the passenger compartment cavity are connected at the sound hole, and share a node locally; Connection 10: The rear hub package inner cavity and the spare tire cavity are connected at the left and right sides of the spare tire cavity, and share a node locally; Connection 11: The rear hub package inner cavity and the rear hub package outer cavity are connected at the metal hole, and share a node locally; The sound cavity material attribute is assigned to the connected sound cavity.

2. The method of modeling an acoustic cavity for vehicle NVH mid-frequency analysis of claim 1, wherein: In the vehicle body structure screening, the metal and glass directly contacted with the air inside the vehicle are screened out, including the front windshield, the water channel, the front wall plate, the side wall, the A-pillar inner metal, the B-pillar inner metal, the rear inner hub package, the rear outer hub package, the front door inner metal, the front door outer metal, the front door glass, the rear door inner metal, the rear door outer metal, the rear door glass, the back door inner metal, the back door outer metal, the back door glass, the roof, the sunroof, the floor, and the metal between each part.

3. A method system for modeling acoustic cavities in full vehicle NVH mid-frequency analysis, characterized by: The controller and the memory are included, the memory stores the computer readable program, and the computer readable program can execute the steps of the modeling method of the sound cavity of the whole vehicle NVH middle frequency analysis when called.

4. A storage medium characterized by: The memory stores the computer readable program, and the computer readable program can execute the steps of the modeling method of the sound cavity of the whole vehicle NVH middle frequency analysis when called.

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