关键词: 轻卡；发电机支架；支架断裂；共振；故障分析

Abstract: In view the breakage failure of generator bracket in a light truck, through the hammering modal test and vibration test, the cause of the failure is determined that the first order frequency is too low and resonance occurred. According to the test results, the generator bracket structure is optimized by strengthening its stiffness and reducing the height of generator. The optimized generator system is analyzed by finite element method, the modal and strength met the design requirement. Finally, the optimized generator system is tested. The first-order frequency is close to the calculated result, and the generator vibration amplitude is greatly reduced.

Key words: Light truck; Generator bracket; Bracket breakage; Resonance; Finite element