Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (6): 1292-1300.doi: 10.13229/j.cnki.jdxbgxb20210094

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Unloading impact simulation and test of luffing jib tower crane

Yang LIU()   

  1. College of Engineering and Design，Hunan Normal University，Changsha 410081，China
  • Received:2021-01-25 Online:2022-06-01 Published:2022-06-02

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Abstract:

To address the dynamic behavior of luffing jib tower crane under unloading impact conditions， a virtual prototype modeling method of a crane based on a non-parametric model and a crane anti-backward-tilting test method are proposed. Firstly， through the characteristic test of the hydraulic anti-backward-tilting device （HATD） and the unloading test of the unloader， a non-parametric model describing the damping characteristics of the HATD and the excitation function of the unloading load are established respectively. Then， the rigid-flexible coupling model of the tower crane and the non-parametric model established through the unit test are integrated into the virtual prototype model of the crane， and the virtual prototype simulations under a series of unloading conditions are carried out. The remote operation method is used to implement the anti-backward-tilting test of a luffing jib tower crane， and the validity of the simulation model is verified through a series of load tests. Finally， the dynamic response of the crane structure under extreme unloading conditions is predicted through simulation， which provides a quantitative basis for the design of the key structure of the crane.

Key words: mechanical design, luffing jib tower crane, anti-backward-tilting test, non-parametric model, virtual prototype

CLC Number: 

  • TH212

Fig.1

Prototype of the luffing jib tower crane"

Fig.2

Scheme of the HATD"

Fig.3

Virtual prototype modeling method for the crane"

Fig.4

Test device for hydraulic buffer characteristics"

Fig.5

Slope excitation and dynamic response of the actuator"

Fig.6

Relationship between actuation speed and actuation force"

Fig.7

Simulation model of the HATD"

Fig.8

Test device of the unloader"

Fig.9

Test of sudden unloading device"

Fig.10

Tension response of the unloader"

Fig.11

Rigid-flexible coupling model of crane"

Fig.12

Displacement response of the boom tip"

Fig.13

Impact simulation between theboom and the HATD"

Fig.14

Test device of anti-backward-tiltingfor the crane"

Fig.15

Dynamic response measurement method"

Table 1

Sensor table"

传感器型号量程安装位置
压力传感器MBS3050060G1151250×105 Pa阀块
倾角传感器赫斯曼倾角仪90°起重臂根
激光测距仪ODSL96BM/C6-20002 m油缸
拉力传感器板式电流型50T50 t吊钩与脱钩器之间
应变片BE120-3AA20 000 μm/m桁架结构
加速度计PCB 333B33±50g活塞杆

Fig.16

Dynamic response of the HATD inunloading test"

Fig.17

Comparison of simulation value and test value of hydraulic pressure in series test"

Table 2

Comparison of simulation and test results of peak hydraulic pressure under a series of unloading conditions"

卸载载荷54%额定载荷60%额定载荷67%额定载荷73%额定载荷
误差/%2.17.36.39.1
仿真值/105Pa9.210.211.913.1
试验值/105Pa9.41111.212.0

Fig.18

Hydraulic pressure under seriesunloading shock"

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