Payload Oscillations Minimization via Open Loop Control.

The results of tests of payload oscillations, forced by linear control function which allows to minimize payload sway after acceleration phase and after overhead crane stopping are presented in this paper. The analysis of solution of this problem has been carried out. The algorithm of operation for real drive system which takes into account the possibilities of driving of an overhead crane is also presented. The impact of inaccuracies of measurement of the ropes length on minimizing a displacements of payload during the duty cycle is shown as well. The correctness of the method is confirmed by results both simulation and experimental tests

Modelling and control of offshore crane systems

University of Technology Sydney. Faculty of Engineering and Information Technology.Cranes are widely used in transportation, construction and manufacturing. Suspended payloads in crane system are caused to swing due to actuator movement, external disturbance such as wind flows, and motion of the crane base in the case of portable cranes. Recently, offshore cranes have become a new trend in stevedoring and in offshore construction as they can help to avoid port congestion and also to exploit ocean engineering applications. For crane operations, it is important to satisfy rigorous requirements in terms of safety, accuracy and efficiency. One of the main challenges in crane operations has been identified as the sway motion control, which is subject to underactuation of crane drive systems and external disturbances. Particularly in offshore cranes, the harsh conditions can produce exogenous disturbances during the load transfer at various scenarios of offshore crane operations in practice. Therefore, it is interesting as to how to design robust controllers to guarantee high performance in the face of disturbances and parameter variations in offshore cranes. The motivation for this thesis is based on recent growing research interest in the derivation of dynamic models and development of control techniques for offshore cranes in the presence of, for example, the rope length variation, sway, ocean waves and strong winds in offshore crane systems. Accordingly, the work for this thesis has been conducted in the two main themes, namely analytical modelling and control design, for which new results represent its contributions. Dynamic models of two types of offshore crane systems, namely the offshore gantry crane and offshore boom crane, are derived in the presence of vessel’s ocean wave-induced motion. The effect of wind disturbances on the payload sway is also considered in the modelling. In the control context, sliding mode control techniques for a generic form of underactuated mechanical Lagrangian systems are presented, including the conventional first-order, second-order and adaptive fuzzy sliding mode controllers. The major component in this part of the thesis is the design of sliding mode control laws based on the developed offshore crane models for trajectory tracking problems, in the presence of persistent disturbances in severe open-sea conditions. Extensive simulation results are presented to demonstrate the efficacy of the models and robustness of the designed controllers

A Robust Offline Precomputed Optimal Feedforward Control Action for the Real Time Feedback/Feedforward Control of Double Pendulum Gantry Cranes

none1openvalentina orsiniOrsini, Valentin

Application of Non-Model Dependent Hybrid Higher-Order Differential Feedback Controller on Crane System

Gantry Crane is a machine used for shipping of goods from one point to another. Speed, accuracy and safety are of paramount importance in gantry crane (GC) operation, but operating GC results in unwanted sway which degrades the accuracy and safety. In this paper, hybrid control schemes are proposed for precise trolley position control and sway suppression in GC systems. Output Based input shaping (OBIS) filter was designed using the output of the system for sway suppression and proportional integral derivative (PID), linear quadratic regulator (LQR), higher order differential feedback (HODF) controllers were incorporated separately for precise trolley position control. Based on Simulation studies and analysis, it was observed that LQR-OBIS controller shown more precise tracking and higher sway reduction control. But HODFC-OBIS is a model-free control schemes hence more robust

State Variable Feedbaek Control of a Gantry Crane

The outcome of this project is to design a controller to meet the requirement of high positioning accuracy and small swing angle, motion and stabilization control of gantry crane. The dynamic of the gantry crane system has been modeled in state variable form to obtain state feedback gain matrix and system parameters has been defined and suitable desired poles has been specified to complete the dynamic modeling. The State Variable Feedback Control is chosen to be implemented in gantry crane control system because it can control multiple variables which are the gantry's position, speed, load angle and angular velocity at the same time. Block diagram constructed using Simulink which represents the controller has successfully achieved the objectives. An analytical analysis is conducted to study on the effect of system parameter changes. The scopes of studies involved will be on various types of gantry crane model, various control technique, gantry crane system modeling and simulation using MATLAB Simulin

State Variable Feedback Control Of A Gantry Crane

The outcome of this project is to design a controller to meet the requirement of high positioning accuracy and small swing angle, motion and stabilization control of gantry crane. The dynamic of the gantry crane system has been modeled in state variable form to obtain state feedback gain matrix and system parameters has been defined and suitable desired poles has been specified to complete the dynamic modeling. The State Variable Feedback Control is chosen to be implemented in gantry crane control system because it can control multiple variables which are the gantry’s position, speed, load angle and angular velocity at the same time. Block diagram constructed using Simulink which represents the controller has successfully achieved the objectives. An analytical analysis is conducted to study on the effect of system parameter changes. The scopes of studies involved will be on various types of gantry crane model, various control technique, gantry crane system modeling and simulation using MATLAB Simuli