In order to solve the problem of the robustness of the performance of automotive acoustic package parts in mass production,an uncertainty optimization method based on interval analysis is proposed.The BIOT theory and the transfer matrix method are used to simulate the sound absorption and insulation performance of the acoustic package parts,the Interval perturbation theory is used to analyze the uncertainty of acoustic performance,and the interval uncertainty optimization method is introduced to optimize the material selection and structural design parameters of the parts.The results show that the method is used to analyze and design the inner front wall parts of a certain model,the quality of the parts decreases by 12.8％,and the robustness of the system is greatly improved,and the maximum fluctuation of insertion loss decreases from 8 dB before optimization to 5 dB after optimization.
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