基于参变量变分原理的直升机系留载荷高性能计算方法

为了保证直升机在舰船上的安全性,必须使用系留设备将直升机系留在舰船上。直升机的系留问题可简化为由机身刚体、索具和起落架组成的杆件系统,索具只承受拉力而不承受压力,起落架只承受压力而不承受拉力。因此,直升机系留问题为典型的强非线性问题,需要发展有效的求解算法。在考虑大变形的情况下,基于参变量变分原理建立了求解直升机系留载荷的高性能计算方法。 该方法利用参变量变分原理能够准确判断索具和起落架的拉压状态,并将材料非线性静力问题转换为线性静力互补问题求解,极大地提高了结果的收敛性。数值算例中,通过与有限元通用软件NASTRAN和ABAQUS计算结果比较,证实了该方法的精确性、收敛性及高效性。

High-performance method for mooring load computation of helicopter based on parametric variational principle

To ensure the security of the carrier helicopter on a warship,the helicopter must be moored on the deck by using a mooring device.The mooring problem of the helicopter can be simplified to a truss consisting of the helicopter body,the rope and undercarriage.The rope is subject only to tension not compression,while the undercarriage is subject only to compression not tension.This indicates that the mooring problem of the helicopter is strongly nonlinear and the effective numerical algorithms are needed.Based on the parametric variational principle,a high-performance method is proposed to compute the mooring load of the helicopter when the large deformation of the structure is considered.This method can accurately determine the states of tension and compression for rope and undercarriage by using the parametric variational principle,and the material nonlinearity analysis of the mooring system is transformed into a complementary problem.The convergence of the results is greatly improved.Compared with the results of NASTRAN and ABAQUS software packages,the accuracy,convergence and efficiency of the proposed method are verified by numerical examples.