Prestressed modal and fatigue characteristic analysis of pedal machine support

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To ensure the reliability and stability of the pedal machine support under prolonged operational conditions, prestressed modal analysis and fatigue characteristic analysis were conducted using the finite element method. A coupling module integrating intensity and mode was constructed and imported into Workbench via intermediate data files to facilitate grid division, material property definition, and load application. Through simulation and calculation, the first four natural frequencies and modes of the model were determined, aligning with vibration response test results. The stress field analysis showed that the maximum stress experienced by the model was 93 MPa, meeting static strength requirements. Furthermore, fatigue life and safety factor of the support frame were assessed under fatigue analysis conditions. The conclusions indicate that the structure exhibits robust safety characteristics in compliance with fatigue load requirements.