Modeling and Optimization on Yard Allocation Planning for Container Terminals

2010 ◽  
Vol 156-157 ◽  
pp. 540-546
Author(s):  
Lei Lin Yu ◽  
Zhi Qiang Lu ◽  
Li Feng Xi ◽  
Zhan Wan ◽  
Lin Li
Keyword(s):  
Mathematical Modeling ◽  
Heuristic Algorithms ◽  
Operational Efficiency ◽  
Experimental Results ◽  
Container Terminals ◽  
Modeling And Optimization ◽  
Container Logistics ◽  
Promising Tool ◽  
Container Shipment ◽  
Allocation Planning

The increase of container shipment causes higher demand on the seaport container terminals, container logistics and management. How to rationally allocate the limited space resources and how to improve operational efficiency, is an important subject for container terminals. In this paper, the mathematical modeling and optimization on yard allocation planning based on the mixed storage is proposed with an objective to balance the workload among different blocks and to minimize the delay of container ships. Two corresponding heuristic algorithms are developed to solve this problem. The experimental results show that the proposed algorithms are the promising tool for allocating blocks’ workload.

Mathematical Modeling and Optimization of Iron Ore Sinter Properties

2007 ◽  
Vol 47 (3-4) ◽  
pp. 373-379 ◽  
Author(s):  
Eugene Donskoi ◽  
James R. Manuel ◽  
John M. F. Clout ◽  
Yimin Zhang
Keyword(s):  
Mathematical Modeling ◽  
Iron Ore ◽  
Modeling And Optimization ◽  
Iron Ore Sinter

scholarly journals A Power-Assisted Cart with the Optimal Assistance Ratio and Disturbance Observer-Based Methods for Walking Assistance Applications

2021 ◽  
Vol 11 (3) ◽  
pp. 1079
Author(s):  
Xianglong Wan ◽  
Jiaxin Ma ◽  
Yichi Zhang ◽  
Takahiro Endo ◽  
Fumitoshi Matsuno
Keyword(s):  
Healthy Subjects ◽  
Disturbance Observer ◽  
The Elderly ◽  
Operational Efficiency ◽  
Motor Output ◽  
Experimental Results ◽  
Control Methods ◽  
Road Surfaces

In this paper, we propose two control methods for driving a power-assisted cart made for walking assistance for the elderly. The optimal assistance ratio (OAR) and disturbance observer-based (DOB) methods properly adjust the motor output of the cart with high operational efficiency in response to changes in the environment. Healthy subjects walked with the cart on several road surfaces under various conditions, and the experimental results indicate the high operational efficiency of the two proposed methods. Meanwhile, their drawbacks are also discussed herein. The two methods can be used separately or combined according to the application. The OAR method is more suitable for indoor use, while the DOB method is applicable for outdoor applications. Combining these two methods could overcome the mentioned drawbacks.

Initial Experiments on the Control of a Mobile Tower Crane

2007 ◽  
Author(s):  
Joshua Vaughan ◽  
William Singhose ◽  
Paulo Debenest ◽  
Edwardo Fukushima ◽  
Shigeo Hirose
Keyword(s):  
Theoretical Model ◽  
Material Handling ◽  
Operational Efficiency ◽  
Experimental Results ◽  
Input Shaping ◽  
Oscillatory Dynamics ◽  
Tower Crane ◽  
Operational Capabilities ◽  
The World

Cranes are used extensively throughout the world in a wide variety of construction and material handling applications. The speed at which these cranes are operated is limited by payload oscillation. Input shaping is one method that reduces this oscillation, allowing higher speeds and improving operational efficiency. Another method to improve the operational capabilities of cranes is to allow base motion. This paper presents initial experimental results from a portable, mobile tower crane. A theoretical model of the crane is presented and experimentally verified. The oscillatory dynamics of the crane are highlighted and controllers to combat these unwanted dynamics are presented.

Feeding Mathematical Modeling of Superalloy Vacuum-Electromagnetic Casting and its Application

2012 ◽  
Vol 629 ◽  
pp. 171-175
Author(s):  
Wen Zhong Jin ◽  
Su Fang Li ◽  
Wei Zhang
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
New Technology ◽  
Experimental Results ◽  
Electromagnetic Stirring ◽  
Shrinkage Cavity ◽  
Vacuum Casting ◽  
Electromagnetic Casting ◽  
Wide Range

The new technology of superalloy vacuum-electromagnetic casting was developed and the feeding mathematical model melt in vacuum-electromagnetic casting was established. The availability of mathematical model was approved by the experiments of the IN100 superalloy. The experimental results indicate that the feeding capacity of melt in vacuum casting can be greatly increased by imposing the 50Hz, 60A rotating electromagnetic stirring, which can decrease the central shrinkage cavity in superalloy ingots, so the quality of the superalloy ingots can be wide-range improved.

Mathematical modeling and optimization of cam mechanism in delivery system of an offset press

2017 ◽  
Vol 110 ◽  
pp. 100-114 ◽  
Author(s):  
Tiancheng Ouyang ◽  
Pan Wang ◽  
Haozhong Huang ◽  
Ning Zhang ◽  
Nan Chen
Keyword(s):  
Mathematical Modeling ◽  
Delivery System ◽  
Modeling And Optimization ◽  
Cam Mechanism
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