초록 ▼

The present invention provides a method and system which allows evaluation of vehicle designs both aerodynamically and aeroaccoustically in a virtual environment. Starting with a computer aided design (CAD) description of the vehicle, a CFD simulation can be constructed and executed. This informatio

The present invention provides a method and system which allows evaluation of vehicle designs both aerodynamically and aeroaccoustically in a virtual environment. Starting with a computer aided design (CAD) description of the vehicle, a CFD simulation can be constructed and executed. This information can be used to provide an estimate of interior sound due to wind noise, which can then be played through speakers for A-to-B comparisons of alternate vehicle designs. The method generates predicted wind noise within a passenger compartment of an automotive vehicle from a computer aided design (CAD) model representative of the vehicle without use of a physical wind tunnel. A CAD model of a desired portion of the vehicle is prepared and a computational mesh of the desired portion of the vehicle design is created from the CAD model. A transient flow over the desired portion of the vehicle is then computed using the computational mesh, and a set of aerodynamic data from at least one predetermined area of the desired portion of the CAD model from the transient flow is extracted from the transient flow. A virtual representation of wind noise at a predetermined location with respect to the CAD model based upon the set of aerodynamic data is then generated, and an acoustic representation of the virtual representation of wind noise is produced.

대표청구항 ▼

[ We claim:] [9.] A method for predicting automotive vehicle wind noise within a passenger compartment of a computer aided design (CAD) model of an automotive vehicle within a virtual wind tunnel, the method comprising the steps of:storing a first set of data representing a CAD model of a desired po

[ We claim:] [9.] A method for predicting automotive vehicle wind noise within a passenger compartment of a computer aided design (CAD) model of an automotive vehicle within a virtual wind tunnel, the method comprising the steps of:storing a first set of data representing a CAD model of a desired portion of the vehicle in a computer memory;storing a second set of data representing a computational mesh of the desired portion of the vehicle design in the memory based upon the first set of data;computing a third set of data representing a transient flow over the desired portion using the second set of data;extracting a fourth set of data form the third set of data representing aerodynamic data from at least one predetermined area of the desired portion of the CAD model;generating a fifth set of data of a virtual representation of wind noise at a predetermined location with respect to the CAD model based upon the fourth set of data, the set of data generated using a set of predicted interior sound pressure levels with a wind noise modeling program and shaping a white noise file with the predicted sound pressure levels to represent the predicted wind noise; andproducing an acoustic representation of the fifth set of data.