针对直升机特有的涡环飞行状态，根据直升机空气动力学理论，分析了直升机涡环状态飞行事故的现象及成因。
To investigate helicopter vortex-ring state, the phenomenon and reason of helicopter vortex-ring state flight accident is analyzed from the view of helicopter aerodynamics.
软土地基的不均匀沉降将导致管道纵向力学性状的变化，产生破坏管道的应力响应，从而引发工程事故。
Uneven settlement of soft_soil foundation will cause changes of longitudinal mechanical properties, and generate stress response destroying pipelines, thereby will cause engineering accidents.
该文通过对车辆的动力学分析，建立了事故再现中的汽车轨迹模型，并实现了计算机软件，最后对模型进行了验证。
Through the dynamic analysis of vehicle, the Vehicle Trajectory Model is built, and the programming of the model is established and validated in the paper.
应用推荐