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| Simulation of system dynamics of electric cranes during operation of lifting mechanism |
| Received:April 06, 2013 Revised:April 05, 2014 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201405003 |
| KeyWord:electric crane lifting operation electro-mechanical coupling non-smooth and non-stationary dynamic system numerical simulation |
| Author | Institution |
| 牛聪民 |
厦门大学嘉庚学院 机电工程系, 漳州 ;大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 欧阳华江 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 ;英国利物浦大学 工程学院, 利物浦 L69 3GH |
| 张洪武 |
大连理工大学 工业装备结构分析国家重点实验室, 大连 |
| 林育兹 |
厦门大学 机电工程系, 厦门 |
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| Abstract: |
| The dynamics of electric overhead cranes during the lowering operation of the lifting mechanism were studied in a systematic view.By means of the transient model of the three-phase induction motor controlled by a speed control system and Hamilton's principal with a modified Lagrangian which consists of the ordinary Lagrangian and constraints of the crane system,and magnetic co-energy of the motor in the lifting mechanism,the equations of motion of the electric overhead cranes during the operation of the lifting mechanism were derived.The numerical simulations of the normal process for lowering a rated payload of an electric overhead crane of 32t are presented.The effects of the torsional stiffness of the floating shaft in the high-speed link of the lifting mechanism and rotor resistance of the driving motor on dynamic responses of system are discussed.It is seen that the peak load acting on the high-speed link of lifting mechanism during braking is much greater than that when starting during a normal lowering operation for a rated payload and a bigger rotor resistance at the start of the braking process is favorable to decrease the dynamic loads applied to the electric overhead crane during braking. |