基于悬臂梁法和面元法耦合的桨叶应力分布预报

摘要

In order to calculate the stress distribution of propeller blade quickly and accurately ,a fore‐casting method of stress distribution in the blade of ship propeller was established by combining canti‐lever beam method and penal method .T he composite bending modulus of each point in blade section was calculated by formula of sectional characteristic about engineering mechanics .The bending mo‐ment and the centrifugal force that the blade section bears was calculated by discrete method .The blade stress prediction program about cantilever beam method was compiled by FORTRAN computer language and jointed with panel‐method program for predicting steady propeller performance . The stress distribution of blades about propeller without skew and rake and highly skewed propeller was calculated by the method in this paper ,compared with the calculation result of finite element method . T he result show s that the stress distribution of blade calculated by the tw o methods w as relatively i‐dentical ,which verified the efficiency of the method .The program can be embedded in the program of theoretical design and optimization design of propeller ,ensuring that the design propeller has enough strength .%为了能够快速而又准确地计算螺旋桨桨叶的应力分布，建立了基于悬臂梁法和面元法耦合的螺旋桨桨叶应力预报方法。桨叶切面上各点的抗弯剖面模数由工程力学中截面特性相关公式求解；桨叶切面所受的弯矩和离心力由离散方法求解。基于FORTRAN语言编译悬臂梁法桨叶应力预报程序，将其与螺旋桨的定常面元法性能预报程序对接。以无侧斜螺旋桨和大侧斜螺旋桨为例，预报桨叶应力分布并与有限元法计算结果进行对比。对比结果表明：两种方法计算得到的螺旋桨桨叶应力分布比较吻合，验证了本文方法的有效性。该方法可嵌入到螺旋桨的理论设计和优化设计过程中，以保证设计桨有足够的强度。