A Rigid-Flexible Coupling Simulation Method of Nonlinear Stiffness Leaf Spring

Abstract

The invention discloses a rigid-flexible coupling MNF simulation method for a steel plate spring with nonlinear rigidity. According to the method, the plate spring in a frame system is taken as a flexible body, and a nonlinear characteristic of the plate spring is tested by adopting multiple different constraint modes through four modes of no-load, half-load, full-load and overload in an assembly state of the plate spring to obtain a variable rigidity characteristic curve, with a relatively high degree of matching with a test result, of the plate spring in different modes, so that a physical characteristic of the flexible body is reflected more fully and really; meanwhile, correct constraint and connection are established between a nonlinear wheel and the plate spring with the nonlinear variable rigidity, so that the theoretical defects between the flexible body and a flexible wheel and between flexible bodies are made up for; and the method has a relatively good guidance effect for positive research and development of the frame system.

Description

technical field [0001] The invention relates to the technical field of rigid-flexible coupling calculation methods for vehicle frame systems, in particular to a rigid-flexible coupling simulation method for nonlinear stiffness leaf springs. Background technique [0002] The frame system transmits all the forces and moments acting between the wheels and the frame, and eases the impact load transmitted from the road to the frame, attenuating the vibration of the bearing system caused by it, so as to ensure the smooth running of the car; and the leaf spring It is a key structural component of the automobile suspension, and its stiffness characteristics directly affect the ride comfort and road friendliness of the vehicle. MNF refers to the flexible body undergoes a special process in the dynamics simulation, and then the modal file, mass, inertia and other information are converted into dynamic parameter files through certain data. Rigid-flexible coupling refers to the process...

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Problems solved by technology

However, the free mode of the above-mentioned finite element exists: it does not take into account the constraints in the assembled state, and usually cannot reflect the physical characteristics of the flexible body; at the same time, there are also differences between the flexible body and the flexible body Theoretical defects; therefore, the existing frame system rigid-flexible coupling calculation method cannot establish correct constraints and connections between the nonlinear wheel and the nonlinear variable stiffness leaf spring, therefore, it is necessary to theoretically innovate this technology

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