基于起落架构型的沥青道面交通量换算

Traffic Discharge Conversion on Asphalt Pavement Based on Main Landing Gear

为了解决沥青道面混合交通的计算问题,提出了用荷载圆半径、胎压、轮径比和轴径比表示单轮、双轮和双轴双轮起落架荷载的特性。应用概率统计理论,统计分析现有飞机起落架的轮径比和轴径比的特性,双轮起落架的轮距特性可用轮径比3.32表示,用轴径比6.791,轮径比4.0和5.0为界将双轴双轮起落架分为3类。运用疲劳等效原理,以底基层的拉应力和相应的疲劳方程作为换算标准,选取7种典型结构,计算不同胎压和半径的同型和异型起落架荷载作用下底基层的最大拉应力,得到各型起落架的换算系数,建立了设计飞机与其它飞机间的交通量换算关系,满足了交通量换算中按不同飞机作为设计飞机时,进行道面结构设计所得的厚度是相同的原则。

This paper mainly studies the traffic discharge conversion on asphalt pavement and presents that the property of main landing gear can be known by the load circle radius, tire pressure, wheel - tread and radius ratio, distance between tandem and radius ratio. Characteristics of wheel - tread and radius ratio, distance between tandem and radius ratio on current airplane are analyzed based on probability theory. Wheel - tread and radius ratio of typical dual wheel gear is 3,32, the dual tandem dual wheel gear is classified into three models by distance between tandem and radius ratio 6.791 and the wheel - tread and radius ratios 4.0 and 5.0. By applying the fatigue principle and the conversion standard of tensile stress of the bottom of sub - base and the fatigue equation as the conversion standards, selecting 7kinds of typical construction to calculate the greatest tensile stress of the bottom of sub - base for the iso - type gear and hetero - type gear of different the load circle radius and tire pressure, the conversion coefficient of the gear is obtained and the traffic discharge conversion relation between the design airplane and other airplanes is established. The traffic discharge conversion satisfies the principle that the asphalt pavements designed according to the different design airplanes are equal in thicknesses.