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Car Interior Simulation Model for Low Frequencies Using the Finite Difference Time Domain Method

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A car interior simulation model based on the Finite Difference Time Domain method (FDTD) has been constructed in Matlab. The FDTD method is a finite wave propagation method that is very robust at low frequencies where other room simulation models as Ray Tracing are not sufficiently accurate. A measurement setup consisting of an array of 16 microphones and two low frequency loudspeakers in the car interior has been utilized to evaluate and verify the model. A number of 16 x 25 microphone positions producing 400 impulse responses inside the car interior have been measured for each loudspeaker. The FDTD method provides a tool for analysis of sound propagation, room modes and time response that can be applied for research purposes in automotive environment acoustics. The results indicate good agreement between the FDTD automotive simulation and measurements in a test car below 100 Hz.

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