矩形梁式前副车架车型车内轰鸣的优化

针对某矩形梁式前副车架车型匀速和加速行驶时的车内轰鸣问题进行了分析和优化。对激励源和传递路径的测试和分析结果表明,动力总成的激励通过悬置传递到副车架上,而副车架的模态与车内空腔模态耦合导致了车内严重轰鸣。通过优化动力总成悬置系统减小动力总成对副车架的激励,以及在副车架上安装动力吸振器的两种方案能有效减小车内轰鸣,改善车内噪声水平。

Optimization of the booming noise of a vehicle with a rectangle front sub-frame

Analysis and optimization were carried out on the booming noise during cruise and acceleration of a vehicle equipped with a rectangle front sub-frame system. The investigation of the excitation source and transfer path showed that, the excitation of powertrain transferred though the mount to the front sub-frame, and the couple of the front sub-frame system mode with the interior cavity mode led to the serious booming noise in the cabin at both acceleration and cruise condition. By optimization of the mounting system to reduce excitation, and a dynamic absorber mounted on sub-frame reduced the booming noise effectively, the NVH performance were greatly improved.