摘要
为了对工程车辆的落物保护装置(FOPS)进行可靠性试验提供理论依据,采用冲击动力学的塑性波两侧的动量平衡理论对工程车辆FOPS受冲击时落锤的动态响应进行了研究,建立了锤头变形的基本方程,绘制了方程相应曲线;建立了锤头在冲击过程中任一瞬时变形长度和非变形长度的数学模型,找到了工程应变和冲击速度之间的曲线对于塑性大变形的突变点及影响落锤变形的各个因素和控制变形的依据。为减小落锤的蘑菇形尺寸,降低锤头的材料成本,多次重复使用落锤,进行合理的落锤结构设计指明了方向。
It is necessity to take an impact test for FOPS in laboratory in order to install falling object protective structures at engineering vehicle and check its dependability. It is important to rational design the drop hammer. Authors study the dynamic response of dropping hammer during the FOPS of engineering vehicle being impacted with the momentum balance theory,establish the mathematical model of plastic deformation for dropping hammer at the end of impact and draw the curve of the formula. The factors influencing the deformation of hammer have been found out and the strategies for the control of the deformation are discussed. The plastic big deformation mutation point of curve have been found out between engineering strain and impact speed. The mathematical model for the relations between the hammer length after deformation and that before deformation at arbitrary time provides the theoretical foundation for the study of the plastic deformation of the dropping hammer.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2004年第1期123-126,共4页
China Journal of Highway and Transport
关键词
工程机械
塑性变形
冲击动力学
质量守恒
落物保护装置
数学模型
construction machinery
plastic deformation
impact dynamics
mass conservation
FOPS
mathematical model
