Abstract
This paper investigates the planar wide-frequency vibration characteristics of heavy-load radial tires with a large aspect ratio. A proposed tire model with a piecewise flexible beam on an elastic foundation is investigated and validated using experimental modal analysis and theoretical modeling method. The reproducibility of frequency response functions below 400 Hz is discussed. The experimental modal analysis particularly assesses the coupling of features across the circumferential and cross-sectional directions of heavy-load radial tire carcass. Piecewise circumferential modal characteristics were investigated experimentally, leading to the suggestion of a piecewise flexible beam on an elastic tire foundation. Using a genetic algorithm (GA), the structural parameters EI, ρ A , and kr and damping coefficients η and cr for the proposed tire model are identified, and the piecewise transfer functions and the planar transfer functions for a heavy-load radial tire are compared with planar hammer test. Experimental and theoretical results show the following: (1) the sectional vibration characteristics for a heavy-load radial tire with a large aspect ratio result from the cross-sectional vibration of the tire carcass; (2) the piecewise transfer function is mainly influenced by the circumferential vibration of the flexible carcass, and this is consistent with a model where a flexible beam is placed on an elastic tire foundation; (3) the analytical transfer functions calculated for the proposed tire model, drawing on the identified structural parameters and damping coefficients, agree well with the experimental results.
Highlights
As the only link interacting with the road, heavy-load radial tires are required to perform multiple functions, such as supporting the vehicle weight, cushioning against the road irregularities, and providing the desired braking/traction/ lateral force for vehicle control systems
Taking the coupled characteristics of the circumferential and cross-sectional vibration of tire carcass into consideration, the modal analysis experiment was able to effectively evaluate planar vibration up to 400 Hz. e outcomes of this experiment were as follows: (1) e planar transfer functions for heavy-load radial tires up to 400 Hz were divided into three parts: uncovering different cross-sectional vibration features for the tire carcass, including both shifting and warping cross-sectional vibration
(2) e sidewall is regarded as the linear elastic foundation, with proportional damping of the sidewall spring being incorporated to enrich the proposed tire model
Summary
As the only link interacting with the road, heavy-load radial tires are required to perform multiple functions, such as supporting the vehicle weight, cushioning against the road irregularities, and providing the desired braking/traction/ lateral force for vehicle control systems. (1) e planar transfer functions for heavy-load radial tires up to 400 Hz were divided into three parts: uncovering different cross-sectional vibration features for the tire carcass, including both shifting and warping cross-sectional vibration. M + (∂M/∂θ)dθ resulted in an unstable modal diagram being produced in the high frequency band
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