混凝土湿喷台车臂架振动模态分析

以国内某公司喷浆台车SPTC25为研究对象,首先利用陀螺仪和加速度传感器在施工现场进行动力学测试,采集到关于臂架在实际施工时的角速度和加速度的时间历程曲线。然后通过数据处理和分析计算,得到臂架在仰俯工况下的振动频率和振幅,分别为1.18 Hz和0.092 m,回转工况下的振动频率和振幅分别为0.98 Hz和0.073 m。其次,对湿喷台车臂架建立了准确的有限元模型,并且进行了模态仿真分析,得到前三阶模态的固有频率和振型。结合隧道施工时的实际操作数据统计,最终得出结论,臂架在施工过程中长时间处于共振状态,使得振幅过大,这是臂架疲劳开裂的主要原因,也为后续湿喷台车臂架的研发和优化提供了新的分析思路。

ANALYSIS AND RESEARCH ON CRACKING REASON OF CONCRETE WET SPRAYING TRUCK MANIPULATOR

It takes a domestic company''s wet spraying truck SPTC25 as the research object. Firstly, it performs the dynamic test of the construction site by using gyroscope and acceleration sensor, and collects the time history curve of angular velocity and acceleration during actual construction of manipulator. Through data processing and analyzing, obtain the manipulator''s vibration frequency and amplitude what are 1.18Hz and 0.092m respectively under the upward and downward conditions, and under the rotating condition are 0.98Hz and 0.073m respectively. Secondly, establish the finite element model accurately for the manipulator of the wet spraying truck, and complete the modal simulation analysis. The natural frequencies and modes of the first three models are obtained. Finally, the conclusion is drawn by combined with the actual operation data of tunnel construction statistics that the boom is in resonance for a long time in the construction process, and the amplitude is too large, which is the main reason for the fatigue crack of the manipulate, the analysis results also provide a new method for the development and optimization of the wet spraying manipulator in the future.