Engineering fatigue fracture failure is one of the most common phenomena of mechanical and structural failure, statistically representing approximately 50 to 90% of total mechanical damage [1]. Lattice structures have been widely used in crane booms, steel plants, parking garages, offshore platforms and other fields [2] to [4]. In a crane, the lattice boom has better mechanical properties compa...

Stress analysis plays a significant role in the design of parts and structures that must carry load [1]. In this study, Crane hook which is one of lifting equipment, frequently used in material handling is investigated. Analytical (Straight beam, curved beam & Winkler-Bach approximation), experimental (Photo-Elasticity) and numerical (FEM) methods were used by various researchers to study stres...

The development of unmanned crane is an important issue of Factory Automation in steel industry. This paper focus on unmanned crane for picking up coils on a trailer although positions and diameters of coils is not fixed. In order to pick up those coils, unmanned crane should know exact 3D coil position. Therefore, in order to find out exact 3D coil’s centers, this paper propose the system that...

As the control system of the ship's crane is nonlinear , time-varying and large inertia, the traditional way to control is difficult to achieve control requirements. The text have the deck crane’ electro-hydraulic proportional valve as the research object, use the way of optimizing input’s fuzzy domain which called variable domain fuzzy PID, to solve the weakness of traditional control and brin...

Construction accidents that involve cranes often relate to struck-by incidents, when the crane or its load is in too close contact with personnel, objects, and/or other equipment. In these incidents, limited or poor visibility of resources in the surrounding work space is often the cause of the problem. The result is often the death, serious injury of worker(s), and/or significant collateral da...

As an example of a spatial manipulator with large work space a 3-DOF overhead crane is considered. A nonlinear model of the overhead crane, including drive dynamics, is derived. The drives of trolley and winch are controlled by velocity controllers. Therefore the dynamics of the drives can be approximated and thus included into the model description. The states of the system are parameterized b...

This work discusses the problem of type inference in the presence of overloading, making a revision of type system CT . This system is an extension of the wellknown Damas-Milner system with support for overloading, where constraints are used in polymorphic types to indicate restrictions on the instantiation of these types, with respect to type assumptions of overloaded symbols that are availabl...

In a networked control system, quantization is inevitable to transmit control and measurement signals. While uniform quantizers are often used in practical systems, the overloading, which is due to the limitation on the number of bits in the quantizer, may significantly degrade the control performance. In this paper, we design an overloading-free feedback quantizer based on a ∆Σ modulator, comp...