Topology Optimization of Multibody Systems Under Transient Thermal Loading for Efficient Heat Dissipation

Topology optimization for efficient heat dissipation in multibody systems subjected to dynamic thermal loading presents unique challenges compared to steady-state thermal loading scenarios. Traditional dynamic topology optimization methods encounter difficulties due to the absence of analytical sensitivity coefficients and the computational impracticality of numerical approximations in dynamic contexts. To address these issues, this paper introduces a novel approach using Equivalent Steady-State Heat Flux (ESHF) for transient thermal loading scenarios. The ESHF method involves using steady-state heat flux distribution obtained from transient thermal analyses at various time steps to define boundary conditions for multiple models, each corresponding to a specific simulation time. A scalarized objective function is then formulated considering these models, and a gradient-based optimizer is employed to identify the optimal topology. This iterative process involves re-evaluating the dynamic analysis, recalculating ESHFs for each model, and updating the topology until convergence is achieved. The effectiveness of the proposed ESHF method is demonstrated through its application to the topology optimization of an internal combustion engine’s connecting rod and piston under transient thermal loading conditions. The results validate the ESHF methodology’s capability to enhance heat dissipation and structural performance in multibody systems.