There are many causes of interior noise in commercial vehicles. The one of them is power steering noise and this study try to reduce the power steering noise by theoretical consideration. The interior noise was tested for the real truck and analysed the frequency. For reducing the interior noise, the spiral tube was adapted and modified the structure in the steering system. The spiral tube system was analysed and made the formula to calculate the reducing frequency. And the effective frequency for reducing the interior noise was calculated by changing the length of tube. Finally, we found the possibility between thoeretical results and real interior noise by comparing the frequency results. The second, the experimental consideration will be worked in power steering system. Finally, the optimal design result will be suggested for reduce the noise.

• 이유엽(Member, Automotive & Mechanical Engineerig Dept. in Howon University) | You-Yub Lee Corresponding author