Abstract:This study focuses on small-scale underwater unmanned vehicles (UUVs) and aims to investigate and analyze the effects of key parameter variations on the UUV's diving process. The controlled variable method is employed to analyze the influence of a single factor on the UUV's diving process. The research findings indicate that during the UUV's propulsion, water flow generates lift on the rudder, resulting in a torque that causes the UUV to dive. Therefore, it is advisable to maintain a smooth attitude and avoid excessive pitch angle and diving depth during the UUV's descent. To ensure successful diving in adverse currents and complex environments, it is necessary to minimize the deflection angle of the rudder and the propeller speed, while retaining a certain margin. The achieved research outcomes have significant reference value for further investigations on the diving process of UUV.