Simulation and Experiment of the Dynamic Behavior of Slender Truss Boom the During Unloading Rebound

doi:10.12141/j.issn.1000-565X.230523

Abstract

Abstract:

The slender truss boom is a key working component of the crane with truss boom, and unloading rebound impact is an important working condition that threatens the safety of slender truss boom crane. To address the dynamic behavior of slender truss booms under unloading impact, this paper used rigid flexible coupling multi-body simulation method and crane unloading impact experimental method to explore the variation law of dynamic stress under unloading rebound conditions of the truss boom, and the unloading impact dynamic load coefficient was calculated based on the dynamic stress of the truss boom. A refined simulation model of a boom tower crane equipped with slender truss booms was established using a rigid flexible coupling method, which includes load model and structural dynamic characteristic model. It analyzed the dynamic stress changes caused by the rebound vibration of the truss boom, and the distribution law of peak dynamic stress during unloading rebound of truss booms was discovered. According to the lifting performance table of cranes with different boom lengths, the relationship between the elevation stress relationship curve and the lifting performance curve was studied, and the sudden unloading condition of the crane corresponding to the maximum stress in the middle of the boom occurred was found. Based on the simulated results of crane unloading impact, a crane unloading impact experiment method based on simulation prediction was established. The sudden unloading impact experiment of the series of boom tower cranes was carried out. The error between the experimental and simulated values of the truss boom dynamic stress is less than 13%, proving that refined model simulation is an effective tool for solving the unloading impact dynamic response of truss boom. Through model simulation, the unloading impact dynamic load coefficient of the slender truss boom under critical situations was further predicted. It finds that there are defects in the relevant regulations on unloading impact dynamic load coefficient in the current crane design specifications. The impact of the truss boom slenderness ratio on the unloading impact dynamic load coefficient was explored, providing a basis for the optimization design of key crane structures.

Key words: rigid flexible coupling model, virtual simulation, unloading impact test, dynamic stress, limit condition prediction

CLC Number:

TH212

FU Ling, LIU Yang, LIU Yanbin, et al. Simulation and Experiment of the Dynamic Behavior of Slender Truss Boom the During Unloading Rebound[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(9): 62-71.

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传感器	型号	量程	安装位置
倾角传感器	赫斯曼倾角仪	90°	桁架臂根
激光传感器	ODSL96BM/C6-2000	2 m	弹簧缓冲器
拉力计	50T板环式	50 t	吊钩与脱钩器之间
应变片	BE120-3AA	20 000 μm/m	桁架臂弦杆

测点	动应力^1）/MPa		误差/%	动应力^2）/MPa		误差/%	动应力^3）/MPa		误差/%
测点	实验值	仿真值	误差/%	实验值	仿真值	误差/%	实验值	仿真值	误差/%
1	98	87	11.2	147	138	6.1	176	158	7.4
2	104	100	3.8	165	152	7.8	191	176	7.8
3	108	103	4.6	170	156	8.2	198	183	7.6
4	110	104	5.4	173	156	9.8	203	183	9.9
5	112	104	7.1	175	155	11.4	207	180	13.0

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