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Proceedings of the ICA 2019 and EAA Euroregio : 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019 : 9-13 September 2019, Aachen, Germany / proceedings editor: Martin Ochmann, Michael Vorländer, Janina Fels 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019, ICA 2019, Aachen, Germany, 9 Sep 2019 - 13 Sep 2019; Aachen (2019)., Published by Aachen

According to the tire inflation pressure changes leading to tire vertical stiffness variation, formulas including tire inflation pressure, load, rolling radius and tire footprint width are deduced. And determine wheel speed sensor numerical value as the critical parameter of predicting tire pressure change. The tire pressure monitoring test is designed and carried out, and the correctness of the algorithm is verified by data analysis.

A new method for calculating the viscoelastic damping matrix of fiber composites is presented in this paper. Firstly, on the lamina scale, the energy dissipation formula is obtained by using a damping matrix and the theory of linear anisotropic viscoelasticity. Then on the laminate scale, a 3-D effective damping (loss) matrix is obtained by using the energy method. In terms of the 3-D effective damping matrix, the laminate energy loss and specific damping capacity (SDC) can be calculated by using the effective stresses and strains. The key to the application of the method lies in the derivation of the effective damping matrix from the constituent lamina damping coefficients, stiffness coefficients and volume fraction and the laminate effective stiffness and compliance coefficients. Based on the effective damping matrix method, the energy loss of viscoelastic fiber composites under arbitrary loading conditions can be calculated. This method has the advantages of generality, simplicity and directness. Several numerical examples are given to illustrate the accuracy of the model.

This article focuses on steel cord deformation and force investigation within heavy-duty radial tires. Typical bending deformation and tension force distributions of steel reinforcement within a truck bus radial (TBR) tire have been obtained, and they provide useful input for the local scale modeling of the steel cord. The three-dimensional carpet plots of the cord force distribution within a TBR tire are presented. The carcass-bending curvature is derived from the deformation of the carcass center line. A high-efficiency modeling approach for layered multistrand cord structures has been developed that uses cord design variables such as lay angle, lay length, and radius of the strand center line as input. Several types of steel cord have been modeled using the developed method as an example. The pure tension for two cords and the combined tension bending under various loading conditions relevant to tire deformation have been simulated by a finite element analysis (FEA). Good agreement has been found between experimental and FEA-determined tension force-displacement curves, and the characteristic structural and plastic deformation phases have been revealed by the FE simulation. Furthermore, some interesting local stress and deformation patterns under combined tension and bending are found that have not been previously reported. In addition, an experimental cord force measurement approach is included in this article.