摘要
目的为了精确地描述起重机在起升过程中产生的动载荷及起升加速度对动载荷的影响.方法采用动力学有限元法,针对起升机构的特点,提出并构建了非线性的起升机构运动单元,对臂架结构则采用标准节单元,对大型自行式桁架臂式工程起重机起升过程进行计算机仿真.结果在吊重离开地面时刻,绳内拉力及主臂内弯矩变为动应力,最大峰值一般发生在吊重起升后1～3s内.结论吊重起升加速度对起重机动载荷的影响较大,特别对主臂内的动弯矩的激励更加明显.
The dynamic behavior of crane during hoisting motion and the influence of hoisting acceleration on the dynamic responses are analyzed in this paper. With consideration of the behavior of crane hoisting mechanism, using dynamic finite element method, the nonlinear hoisting moving finite elements are developed in this paper. The crane lattice units are replaced by standard lattice frame elements. The computer simulation of hoisting motion of a huge mobile lattice crane is carried out. At the leaving time of the load from the ground, the maximum rope forces and bending moments occur from 1 to 3 seconds after hoisting start-up. The influence of load hoisting acceleration on dynamic forces is obvious, especially on dynamic bending moment of the main boom.
出处
《沈阳建筑大学学报（自然科学版）》
EI
CAS
2005年第3期276-280,共5页
Journal of Shenyang Jianzhu University：Natural Science
基金
建设部科技攻关项目(03-2-039)
