Optimization of Lightweight Design for a Certain Range Hood Model Under Strength and Vibration Limitations

To address structural redundancy and excessive vibration in a specific range hood model, this study focuses on structural lightweighting design optimization. Under strength and resonance avoidance constraints, optimization integrates experimental testing and finite element analysis. Modal analysis reveals a prominent resonance at 49.8 Hz, which coincides with the test results. Topography optimization of the impeller side plate ribs shifts its natural frequency, eliminating resonance while reducing weight significantly. Subsequently, topography optimization of key parts such as the fan housing improves stiffness, facilitating further lightweighting. Two optimization methods, direct solver and orthogonal experiment were applied to minimize the total mass under strength and dynamic constraints. Both schemes met all design requirements with weight reductions of 17.7% and 18.3%, respectively. Vibration test of the optimized design shows that accelerations at key points were reduced significantly.