摘要
为准确地了解桥式起重机桥架结构动态起吊重物过程的载荷强度,以某型防爆电动葫芦桥式起重机为研究对象,通过理论分析和有限元仿真分析相结合的方法对起重机起吊货物的瞬态工况进行分析。将货物离地后加速上升过程的载荷看成是变化的,当加速到额定速度匀速上升时载荷不变,比较真实的建立了桥架结构受力模型。通过改变载荷激励条件,得到了不同条件下的位移、速度、加速度响应曲线。结果表明:加速上升过程中载荷增加,桥架结构垂直方向的振动强度增大。在起重机主梁端部缓慢起吊重物,能够使桥架结构的受到的冲击达到最小。为以后的优化设计提供可靠理论支持。
To accurately understand the dynamic load strength of bridge crane bridge structure in lifting process, 5t×7.5m LHBT type explosion-proof electric hoist bridge crane is taken as the research object, theoretical analysis and finite element simulation analysis method are used to analyze the transient cargo crane. The load is considered changing in the accelerate process. When the speed of goods reaches the rated speed and remains uniform speed, the load is considered unchanging. A force model of bridge structure is established. Velocity and acceleration response curves are obtained under different conditions. The results show that, the load of bridge structure is increasing in the accelerate process, the vertical vibration intensity of the bridge structure increases. The impact on the bridge structure can be the smallest when heavy objects are slowly lifted at the end of the crane. It provides reliable theoretical support for the optimization design.
出处
《计算机仿真》
北大核心
2017年第7期178-183,共6页
Computer Simulation
