【摘要】 提出了一种基于路面不平度自功率谱密度函数PSD计算国际不平度指数IRI(International Roughness Index)的方法。通过建立1/4车辆模型来分析路面不平度的输入和汽车振动的响应,由动态响应模型的理论分析得到路面不平度的自功率谱密度函数PSD(Power Spectral Density),再应用随机理论等方法,推得基于路面不平度自功率谱密度函数PSD的IRI值。用PSD计算IRI,能够使车辆和道路部门比较他们对路面不平度的各自评价标准,从而作为其设计、改进产品的依据,IRI的求得,为公路运输部门对道路的养护决策提供了依据。更多还原

【Abstract】 A new mathematical method of International Roughness Index is proposed,which is based on Power Spectral Density of pavement surface roughness.The quarter-car model is established to analyze the inputs of pavement surface roughness and the outputs of auto vibration.The power spectral density of pavement surface roughness is got by theoretic analyzing of dynamic response models.Applying the method of random vibration theory and so on,IRI which based on PSD of pavement surface roughness is deducted.Using PSD for IRI calculating can make vehicle industries and highway transportation agencies to compare their criteria and improve their production designs,and highway transportation agencies can make appropriate decision for pavement maintain accordingly.更多还原