Dynamic Modeling, Parameter Identification and Numerical Analysis of Flexible Cables in Flexibly Connected Dual-AUV Systems
🤖 AI Summary
This study addresses the challenges of modeling the highly nonlinear cable dynamics in a flexible dual-AUV system and the difficulty of directly measuring key parameters. By employing the lumped-mass method, the authors develop a dynamic model that incorporates axial elasticity, bending stiffness, added mass, and hydrodynamic forces. A high-accuracy parameter identification approach is proposed by integrating experimental data, enabling the first successful inverse estimation of the equivalent Young’s modulus and hydrodynamic coefficients. The work reveals the nonlinear response mechanisms of the cable under both slack and taut conditions. The resulting model demonstrates excellent predictive consistency across various operational scenarios, quantifying the influence of material properties and AUV motion on cable configuration and end-point loads, thereby providing a theoretical foundation for the design and control of similar systems.
Application Category
📝 Abstract
This research presents a dynamic modeling framework and parameter identification methods for describing the highly nonlinear behaviors of flexibly connected dual-AUV systems. The modeling framework is established based on the lumped mass method, integrating axial elasticity, bending stiffness, added mass and hydrodynamic forces, thereby accurately capturing the time-varying response of the forces and cable configurations. To address the difficulty of directly measuring material-related and hydrodynamic coefficients, this research proposes a parameter identification method that combines the physical model with experimental data. High-precision inversion of the equivalent Youngs modulus and hydrodynamic coefficients is performed through tension experiments under multiple configurations, effectively demonstrating that the identified model maintains predictive consistency in various operational conditions. Further numerical analysis indicates that the dynamic properties of flexible cable exhibit significant nonlinear characteristics, which are highly dependent on material property variations and AUV motion conditions. This nonlinear dynamic behavior results in two typical response states, slack and taut, which are jointly determined by boundary conditions and hydrodynamic effects, significantly affecting the cable configuration and endpoint loads. In this research, the dynamics of flexible cables under complex boundary conditions is revealed, providing a theoretical foundation for the design, optimization and further control research of similar systems.
Problem
Research questions and friction points this paper is trying to address.
flexible cable
dual-AUV system
nonlinear dynamics
slack-taut response
hydrodynamic effects
Innovation
Methods, ideas, or system contributions that make the work stand out.
dynamic modeling
parameter identification
flexible cable
nonlinear dynamics
dual-AUV system
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