The airlines have reached wenzhou for years ; the jinhua - wenzhou railway project has been recently fulfilled . bridges span the rivers and huge ships paddle up and down the sea , and a high - way connecting wenzhou and taizhou will be soon accompiished . these modern transportations and communications will surely shorten the distance from yandang to the outside world 但如今交通状况已非昔比：温州机场开通已久，金温铁路亦已建成，长桥飞架甫北，巨轮穿梭海上，连结温台的高速公路指日可待，陆海空俱备的现代化交通网络，把雁荡山和世界的距离顿时拉近，即使你远在万里之外，也能朝发而夕至。
According to different mechanisms , there exist several types of resonance , including the bridge resonance induced by the periodical actions of moving load series of the weights , centrifugal forces and lateral winds of vehicles , the bridge resonance induced by the loading rates of moving load series of vehicles , the bridge resonance induced by the periodical loading of train vehicles excited by rail irregularities , wheel flats and hunting movements , and the vehicle resonance induced by periodical actions of the regular arrangement of bridge spans and their deflections 根据发生机理的不同，车桥系统可能发生几种不同形式的共振，包括由车辆重量、离心力、横向平均风荷载等形成移动荷载列的周期性动力作用引起的桥梁共振，由移动荷载列加载速率引起的桥梁共振，由轨道不平顺、车轮扁疤、轮对蛇行等周期性加载引起的桥梁共振；由桥跨的规则性排列及其挠度的影响，对移动车辆形成周期性动力作用使车辆出现的共振。
In this paper , an approach of the systematic artificial neutral net was introduced into the analysis on the ship - against - bridges probability with a computer programs . based on the basic data of the present 12 typical bridges as the sample , 4 chief influential factors as the input coefficient , such as the bridge span , the water flow rate , the incline angle between water flow direction and the direction normal to bridge axis , and the curve in the course near the bridge area , with the ship - against - bridge probability as the output coefficient , the intelligent judging system of the ship - against - bridges probability reflecting the influence of the above input parameters is obtained after training 本文首次将人工神经网络系统方法引入了船撞桥概率的研究当中，编制了计算程序，成功地以现有12座典型桥梁的基础数据为样本，以桥梁跨径、水流流速、水流方向与桥轴法线的夹角以及桥区航道弯曲度等4个船撞桥主要影响因素为输入参数，以船撞桥概率为输出参数，经训练得到了能较好地反映上述输入参数影响的船撞桥概率判断系统。
