CAJ | 학술논문

某三厢轿车在粗糙的老旧沥青路面上行驶时，车内后座存在严重的低频轰鸣声。通过车内空腔声学模态和装饰车身结构模态仿真计算，发现车内后座低频噪声产生的原因为车内空腔的第二阶声学模态与装饰车身车顶后部第六阶局部结构模态强烈耦合。为避免耦合共振，改进了后车顶横梁结构设计。实车验证改进措施有效。
모삼상교차재조조적로구력청로면상행사시，차내후좌존재엄중적저빈굉명성。통과차내공강성학모태화장식차신결구모태방진계산，발현차내후좌저빈조성산생적원인위차내공강적제이계성학모태여장식차신차정후부제륙계국부결구모태강렬우합。위피면우합공진，개진료후차정횡량결구설계。실차험증개진조시유효。
There is a serious booming noise in rear seats of a sedan car when the car is running on an old and rough asphalt pavement. The simulations of the interior acoustic modal of the car’s cavity and the structural modal of the trim’s body show that the low-frequency noise in the rear seats is due to the strong coupling of the second-order modal of the acoustic cavity with the sixth-order local structural modal of the trim’s body. In order to avoid the coupling resonance, the beam structure of the rear roof was modified. This modification can effectively solve the problem of low frequency road noise inside the car.