Exploring the impact of modal modes on controller efficiency for vibration mitigation

This study investigates the effectiveness of vibration modes on the Positive Position Feedback (PPF) controller designed for vibration reduction. To achieve this, a numerical model of the UH1H helicopter’s auxiliary cargo door, previously used as a test setup, is employed. The state-space models of the system are derived by considering three, five, and ten modes of the structure. Optimized PPF controllers are applied to these models, and their performances are systematically compared. Key findings reveal that control performance decreases with an increasing number of modes, with vibration reduction percentages averaging 70.74% for the 3-mode model, 55.88% for the 5-mode model, and 43.68% for the 10-mode model. These results underscore the impact of modal complexity on controller efficacy, highlighting the necessity of simplifying modal configurations for effective vibration control. The study provides critical insights into the design and application of active vibration control systems in aerospace engineering.