摘要
为了预测履带起重机臂架结构的可靠度,将履带起重机臂架的几何尺寸、材料特性参数和作用载荷视为随机变量,建立了以臂架强度、刚度、整体稳定性和压弯杆件稳定性为失效模式的可靠性分析模型,利用响应面法将各隐式功能函数转化为显式表达式,再结合验算点法求得各功能函数的可靠性指标。对现有某型号履带起重机臂架主臂工况进行了可靠性分析。研究结果表明:臂架可靠度随载荷增大而减小,呈非线性变化趋势;相对而言,短臂工况时压弯杆件的稳定性和臂架强度的可靠度较低,臂架倾向于发生压弯杆件失稳和臂架强度失效;长臂工况时臂架整体稳定性的可靠度较低,易发生整体屈曲失效。该研究为臂架的安全程度度量提供了一种基于可靠度的概率评价方法,也为其他大型复杂工程机械产品的可靠性分析与设计提供参考。
In order to predict the reliability of crawler crane＇s boom, the geometrical dimensions, material properties and applied loads of crawler crane＇s boom system were regarded as random variables. The reliability analysis models of strength, stiffness, global stability and compressive- bending members＇ stability were established. Explicit expression of implicit performance function was obtained by using response surface method （RSM）, and then the reliability index was solved bY design point method. The reliability of a certain existing crawler crane＇s main boom was calculated. The results show that the reliability of crawler crane＇s boom reduces as the applied load increases, and takes on nonlinear tendency. Comparatively speaking, for the short boom case, the reliability of compressive-bending members＇ stability and strength are lower, and the boom is prone to occur compressive-bending member＇s buckling and strength failure. For the long boom case, the reliability of global stability is lower, and the boom is prone to occur buckling failure. The research provides a probabilistic assessment method for safety assessment of lattice boom, and a reference for reliability analysis and design of other large complicated engineering machinery manufactures. 4 tabs, 5 figs, 20 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第4期153-158,共6页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(51408046)
中央高校基本科研业务费专项资金项目(310825151042
CHD2009JC152
2013G3254015
2013G1251030)
关键词
机械工程
履带起重机
响应面法
臂架
可靠性分析
失效模式
mechanical engineering
crawler crane
response surface method （RSM）
boom
reliability analysis
failure model
