摘要
为适应节能环保要求,减轻副车架重量,建立了副车架的有限元模型和多体动力学模型,利用ADAMS/Car求得副车架在制动、垂向冲击和转弯3种工况下各关键点处的载荷并对其进行强度分析,通过计算模态频率与试验值进行比较,验证有限元模型的合理性。基于灵敏度分析的方法,选择可用于轻量化的零件,以副车架质量最小为目标函数,在约束副车架强度和低阶模态频率不降低的条件下,优化副车架零件厚度。优化结果表明:副车架强度基本保持不变,各阶模态频率均有所提高,同时总质量减轻6.79%。
In order to meet the requirements of energy conservation and environmental protection, reduce the sub- frame weight, the finite element model for car subframe is established. A rear suspension dynamic model is estab- lished with ADAMS/Car, and loads are calculated for the brake, bump and cornering conditions. Then the struc- ture strength calculation and modal analysis are performed to the initial design of car subframe. The rationality of the present model is verified by comparing the modal frequencies obtained by numerical simulation respectively. Based on the sensitivity analysis method, the appropriate design variables have been chosen, the optimization on the thickness of car subframe is conducted by minimizing the mass of car subframe and meeting the requirements of strength and lower order modal frequencies. The results show that the strength of car subframe is unchanged, the modal frequency of each order is improved, and the total mass of car subframe is reduced by 6.79%.
出处
《机械科学与技术》
CSCD
北大核心
2013年第11期1650-1654,共5页
Mechanical Science and Technology for Aerospace Engineering
关键词
副车架
有限元法
模态频率
灵敏度分析
轻量化
automobiles
boundary conditions
computer simulation
constrained optimization
design
dynamics
finite element method
mathematical models
modal analysis
schematic diagrams
sensitivity analy-sis
stress analysis
three dimensional
car subframe
modal frequency
lightweight
