China
Africa
Explore chapters and articles related to this topic
Case Studies in Machine Design
Published in Ansel C. Ugural, Mechanical Engineering Design, 2022
A crane is a type of machine that is generally equipped with a hoist, winding drum, cable or chain, and sheaves. Coming in many forms, cranes can be employed both to lift or lower materials and to move them horizontally. A crane creates a mechanical advantage and hence moves loads beyond the normal capability of a human. Such machines are often employed in the transport industry for the loading/unloading of freight, in the construction industry for the movement of materials, and in the manufacturing industry for the assembly of heavy equipment.
Case Studies in Machine Design
Published in Ansel C. Ugural, Youngjin Chung, Errol A. Ugural, Mechanical Engineering Design, 2020
Ansel C. Ugural, Youngjin Chung, Errol A. Ugural
A crane is a type of machine that is generally equipped with a hoist, winding drum, cable or chain, and sheaves. Coming in many forms, cranes can be employed both to lift or lower materials and to move them horizontally. A crane creates a mechanical advantage and hence moves loads beyond the normal capability of a human. Such machines are often employed in the transport industry for the loading/unloading of freight, in the construction industry for the movement of materials, and in the manufacturing industry for the assembly of heavy equipment.
Introduction to cyber-physical systems in the built environment
Published in Anil Sawhney, Mike Riley, Javier Irizarry, Construction 4.0, 2020
Pardis Pishdad-Bozorgi, Xinghua Gao, Dennis R. Shelden
We envision that in the near future, most of the daily administrative activities on the construction site will be automated and repetitive works, such as bricklaying, will be performed solely by robots. Similar to some research studies that experimented on the automated operation of cranes (Fang et al., 2018, Lee et al., 2012), future construction machines will also be operated in an automated or semi-automated fashion. For the tasks too complicated to be solely performed by automated machines, construction workers equipped with exoskeletons will complete them efficiently, with the support of augmented or mixed visualization techniques that present the detailed component design and the construction procedure. In addition, workflow for deliveries, change orders, invoicing, scheduling, inspections, and quality control, are all optimized to keep the project on schedule, and on budget.
Intelligent scheduling of double-deck traversable cranes based on deep reinforcement learning
Published in Engineering Optimization, 2022
Zhenyu Xu, Daofang Chang, Tian Luo, Yinping Gao
Compared with other means of transportation, cranes are more suitable for handling heavy processed jobs with irregular shapes and large volumes. Therefore, cranes are used extensively in heavy industry, machinery, ship building and other manufacturing fields. However, when a job is transported, the mutual interference between multiple cranes on the same track reduces the efficiency of the collaborative operations (Heshmati et al. 2019). A double-deck traversable crane (DTC) system can typically mitigate this type of interference problem. The general design pattern of the DTC is shown in Figure 1. Like a regular crane (RC), a DTC is also composed of three parts: gantry, moving in the x-axis direction; trolley, moving in the y-axis direction; and claw, moving in the z-axis direction. The cranes are distributed on the upper and lower floors. When the upper crane is not carrying a job, it is allowed to cross with the lower crane, i.e. there is no physical interference between the upper and lower cranes at this time. Otherwise, the upper crane must maintain a strict safety distance from the lower crane. The primary purpose of this study is to investigate and optimize the double-deck traversable crane flexible job-shop scheduling problem (DTCFJSP).
Improving processes and ergonomics at air freight handling agents: a case study
Published in International Journal of Logistics Research and Applications, 2023
Heiko Diefenbach, Nathalie Erlemann, Alexander Lunin, Eric H. Grosse, Kai-Oliver Schocke, Christoph H. Glock
Cranes for intralogistics can by designed in various ways. Depending on the design, cranes can support vertical and horizontal transport of loads with different reaches (Chu, Egbelu, and Wu 1995). However, a significant disadvantage of cranes is their large space requirement. Furthermore, while cranes can handle relatively high loads, their movements are comparatively sluggish. Cranes are therefore more suitable for handling heavy loads in small numbers (Cho and Egbelu 2005). Judging from our case study, where either small-piece or palletised freight has to be handled, cranes are less applicable for ULD build-up and break-down. However, there might be handling agents with different kinds of freight, where cranes could be a suitable device.
An active swing suppression control scheme of overhead cranes based on input shaping model predictive control
Published in Systems Science & Control Engineering, 2023
Weiqiang Tang, Erpeng Zhao, Lijuan Sun, Haiyan Gao
As a typical representative of crane systems, the overhead crane has the merits of simple structure, high load capacity and convenient operation, etc., widely used in cargo transportation in factories and ports (Ramli et al., 2017). For a specific transportation task, the control of a crane mainly includes hoisting, horizontally transporting and lowering. The hoisting and lowering are vertical operations which are easier to implement, while the horizontally transporting is the most challenging. This is because it is closely related to the positioning of the trolley and the swing of the payload.