某直升机旋翼动平衡试验台主轴动态分析

利用大型商用有限元软件ANSYS,对直升机旋翼试验台主轴系进行动态分析.首先通过简化各种轴系元件,对主轴系进行几何建模.对轴系本体采用3维BEAM188梁单元模拟,对弹性支承的轴承部分采用COMBINE14弹簧单元进行模拟,对旋翼桨和联轴器部分采用MASS21质量单元模拟.然后确定轴系计算的边界条件,进行模态分析,得到轴系振动的各阶固有频率和固有振型.通过谐响应分析,得到轴系在激振力下的位移和应力响应.通过实际试验台主轴的计算分析,说明该方法符合工程实际.

Dynamic analysis for basic shaft of one experimental bench for dynamical equilibrium test of one helicopter's rotor wing

Using the shaft of one experimental bench for a dynamical equilibrium test of a helicopter's rotor wing as the study object for analyzing the structural response, shaft analysis was carried out using big business structural analysis software ANSYS for finite element analysis. First, geometrical modeling of basic shafting by simplified components in every shafting was built. For the body of shafting, three-dimensional BEAM188 girder unit was used for simulation. For the part of bearing in elastomeric supporting, COMBINE14 spring unit was used. MASS21 quality unit was used for the rotor wing-oar and coupling joint. Then, by ensuring the performance parameter and the boundary of qualification in shafting calculation and model analyzing, the inherent frequency and inherent flap of libration on shafting were determing. Through the analysis of response in harmony, the response applied force and response displacement of basic shaft under the exciting force were obtained. This method was proved to accord with engineering fact by calculating and analyzing the basic shaft of one experimental bench.