关键词: 动力总成；模态分析；点火频率；模态耦合

Abstract: The article elaborates on modal analysis, testing theory, as well as modal frequency planning strategies, analyzes the existing methods for setting modal targets and evaluating modal frequencies and existing problems in powertrain. Based on the main design parameters of the engine and the common operating conditions of the vehicle, the second-order ignition frequency range within the engine speed range, the excitation frequency range of high-speed rotating components, and the first-order frequency range of the powertrain are identified, and a powertrain modal frequency planning table is established. Based on the modal planning table, the modal frequency targets of the powertrain and related components are set to avoid modal coupling, avoid various major excitation sources, and improve the noise, vibration, harshness (NVH) performance of the powertrain.

Key words: powertrain; modal analysis; ignition frequency; modal coupling