针对重载子午轮胎扁平率接近1的特点,建立面内刚柔耦合模型并开展振动分析方法研究.提出重载轮胎面内胎体与胎侧耦合的试验模态测试与分析方法;考虑胎侧的惯性力和分段刚度,建立重载轮胎面内弹性基础柔性梁动力学模型;利用有限差分法,将面内耦合动力学方程离散化,建立基于轮胎几何、结构参数的三参数等效刚度重载轮胎面内刚柔耦合模型;基于试验和解析模态共振频率,利用遗传算法对重载轮胎结构参数辨识,建立重载轮胎面内刚柔耦合模型的传递函数解析模型.数值分析和试验验证结果表明:在0 ～300 Hz频率范围内,面内刚柔耦合模型可准确表征重载轮胎面内胎体和胎侧的耦合振动模态与传递特性;该建模与试验分析方法可将重载轮胎的分析频率由0～180 Hz扩展至300 Hz.%A rigid-elastic coupling model is established and the vibration analysis method is presented for researching the in-plane characteristic of heavy duty radial tire with aspect ratio of about 1.The experimental modal test and analysis methods of coupling between carcass and sidewall are proposed,and the coupled natural frequencies are analyzed with the normal pressure and fixed rim.The rigid-elastic coupling equation is modeled with the flexible beam on the foundation that the carcass is modeled as the Euler beam and the sidewall is regarded as the sub-sectional spring with lumped mass.The dynamics equation is dispersed using finite difference method,and three-parameters model is derived based on the geometrical and structural parameters.The structural parameters of tire are identified by the genetic algorithm based on the experimental modal parameter of heavy duty tire,and the higher order modal frequency is predicted using the analytic method.The analytical transfer functions between carcass and carcass,and carcass and sidewall are derived.Experimental and theoretical results show that the rigid-elastic coupling model can be used accurately to predict the transfer function and vibration feature of heavy duty tire within the frequency band of 300 Hz,compared with the method in which only the coupling of carcass and rim is considered,and is limited to 180 Hz.
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