SolidWorks and ANSYS Workbench were used to establish solid model and perform FEM analysis of truck with and without sealing covers respectively. In the past practical production, there has been no precedent for the modal analysis of the truck carriage with a sealing cover; the modal analysis is carried out for the first time in this paper. The vibration characteristics of the truck carriage are obtained. The first ten-order of non-rigid mode of the newly development truck carriage is obtained and the excitation frequency range of the idling state of the engine is calculated to avoid resonating with the ground. In order to avoid the resonance phenomenon during the truck running, the vibration characteristics of the new carriage model were studied, the first ten non-rigid modes of the new carriage model were extracted, and the excitation frequency range of the engine during idling was calculated. The non-rigid natural frequencies of the first 10 free models are between 6.18 ∼ 26.74 Hz. The engine idling excitation frequency is 32.5 ∼ 145 Hz, and the common excitation frequency caused by road roughness is 3 Hz. In theory, it does not cause resonance when driving in a normal state.

中文翻译：

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带有密封盖的卡车车厢的结构改进

使用SolidWorks和ANSYS Workbench分别建立实体模型并对带有和不带有密封盖的卡车进行有限元分析。在过去的实际生产中，尚无对带有密封盖的卡车车厢进行模态分析的先例。本文首次进行了模态分析。获得卡车车厢的振动特性。获得新开发的卡车车厢的前十阶非刚性模式，并计算发动机空转状态的激励频率范围，以避免与地面产生共振。为了避免卡车在行驶过程中产生共振现象，研究了新车模型的振动特性，提取了新车模型的前十个非刚性模式，计算出怠速时发动机的励磁频率范围。前10个自由模型的非刚性固有频率在6.18〜26.74 Hz之间。发动机空转励磁频率为32.5〜145 Hz，道路不平整引起的常见励磁频率为3 Hz。理论上，在正常状态下行驶时不会引起共振。