<p>This study introduces the lattice spring model (LSM) to investigate the incline angle of a non-uniform three-segment towed array under steady-state conditions. A numerical model was established, and parametric analysis was conducted to examine the effects of towing speed and cable density on the incline angle. The numerical simulations demonstrate that for a conventional three-segment towed array with heavy vibration-isolation cable and density exceeding that of seawater, the towing speed must exceed 4 kn to maintain the acoustic cable’s average incline angle below 10°. To validate the proposed LSM, a 100-meter-long towed array with variable densities was fabricated and tested through lake trials. The experimental results align closely with simulations, confirming LSM as a reliable model for predicting towed array position and posture. The study concludes by analyzing the parallel computing capabilities of LSM and its application in Fluid-Structure Interaction (FSI) problems. The model’s precision and parallel computing capabilities make LSM an efficient, reliable tool for analyzing the steady-state behavior of towed systems.</p>