Abstract
The dynamic efficiency of hoisting transmission system on a container crane is fundamental for accurate efficiency prediction, while the dynamic efficiency of hoisting transmission system has not been investigated sufficiently. This paper will focus on dynamic efficiency of hoisting transmission system under hoisting dynamic load. A power loss model of gearbox was built. Then the dynamic model of gear transmission was developed including time-varying mesh stiffness and hoisting dynamic load was studied. Power loss, dynamic efficiency, and equivalent static efficiency were conducted in hoisting and lowering working conditions. The result shows that dynamic efficiency which consists of the significant lower frequency component coincided with hoisting load torque of the higher frequency component which is directly related to dynamic mesh and bearing force. And in two processes, the equivalent static efficiency in constant speed stage is min, whereas maximum value occurs in different stage. The research results lay a foundation for hoisting gear transmission dynamic efficiency analysis.
Highlights
Hoisting mechanism is a significant part of quayside container crane, and its main function is to achieve the hoisting and lowering motion of cargo
It combines a dynamic model for hoisting mechanism to obtain the load torque of gear transmission system under hoisting dynamic load, a gear transmission system model aimed at simulating dynamic parameters for efficiency analysis and a power loss model for dynamic efficiency calculation
The higher frequency component is caused by the dynamic mesh force and bearing force
Summary
Hoisting mechanism is a significant part of quayside container crane, and its main function is to achieve the hoisting and lowering motion of cargo. The changes of cargo’s motion and vibrations of container crane support structure will generate additional dynamic load. The gear transmission of hoisting mechanism is under complex working condition of which the rotation speed and load are continuously changing. The changing rotation speed and load will influence the efficiency of the gear transmission at operating time for different stages. As to the dynamic efficiency of a container crane’s hoisting transmission system under hoisting dynamic load, it is still a blank. This paper will focus on the dynamic efficiency of gear transmission under hoisting dynamic load, including establishing dynamic model for gear transmission and hoisting mechanism, simulating the dynamic mesh and bearing force in hoisting and lowering working condition, and investigating the dynamic efficiency in different working conditions. The time-varying mesh stiffness and hoisting dynamic loads have been taken into account. We have expectations to lay a foundation for hoisting gear transmission dynamic efficiency analysis
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