Coupled with the simulation of unsteady flow , the resonance analysis was studied . as an application , the dynamic stress of the blade was analysed with ansys based on the computation of unsteady flow . the result may be useful in the engineering practice 还根据流场计算得出的叶片上非定常气动载荷，用ansys软件进行了叶片的动应力计算，由于较为接近实际工况，所得动应力值可能具有一定的工程参考价值。
To a helicopter , one of the key technologies is how to control the airscrew . so it is very important to simulate aerodynamic loads acting on the helicopter ' s airscrew when the helicopter is flying in the air . it affords datum , which are contributed to the use of new flight vehicle 对于直升机来说，旋翼操纵控制是其关键技术之一，对旋翼进行地面加载试验，模拟旋翼在飞行过程中所受的气动载荷，对于研究和改进直升机飞行控制系统非常重要。
The main structure stress of the car body is particularly analyzed . it is analyzed and calculated under vertical load case , lengthwise stretch load case , lengthwise compression load case , air pressure power load case , operating load case . result shows : the structure distortion harmonize , strength - weakness positions represent local stress focus 通过对垂向载荷工况、纵向拉伸载荷工况、纵向压缩载荷工况、气动载荷工况和运用状态垂向载荷工况的分析计算，结果表明：该车钢结构变形协调，强度薄弱部位主要表现为局部应力集中。
In addition , aerodynamic stiffness and aerodynamic damping on the system are already obtained in the condition of fluid - structure interaction . it is known that aerodynamic loads are associated with blade vibration . the systematic eigenvalues are used to judge whether the flutter occurs so as to find the stable operating range of a wind turbine 本文把风力机叶片简化为悬臂梁，对梁截面的二维叶型建模，完整推导了二维叶型的线性运动微分方程和流构耦合条件下系统的气动刚度和气动阻尼，此时气动载荷与结构的位移矢量以及速度矢量是相互耦合的，再利用系统的特征值来判断叶片颤振是否发生，从而获得风机的稳定工作范围。
