Structural dynamics of big gantry crane subjected to different trolley move laws (original) (raw)
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Dynamic analyses of gantry crane under several trolley and payload movements
FME Transactions
The aim of this research is to study the dynamic behaviour of a real gantry crane subjected to the actions induced by the trolley and payload movement. A specific numerical procedure was developed and implemented in the finite element method in order to simulate different trolley movement modes on the crane's main beam. From the results, it is clear that the crane displacement, especially the longitudinal one, is strongly dependent on the acceleration both in the starting phase and in the stopping phase to which the trolley is subjected during its movement on the crane main beam. The last part of this research simulates the sudden stop of the trolley movement and subsequent payload swinging; in this case, the length of the rope that suspend the payload to the trolley has a fundamental role in the trend and maximum longitudinal crane displacement value.
Considerations of Various Moving Load Models in Structural Dynamics of Large Gantry Cranes
2013
The paper deals with the moving load problems within the structural dynamic analysis of large gantry crane as high-performance machine. The emphasis is given on combined method approach, i.e. finite element method and analytical postulations, for obtaining the mathematical model of crane. Moving trolley is considered throughout several models: moving force, moving mass, moving oscillator and moving oscillator with swinging object. Each model has characteristics which determine the responses of the crane structure, along with its dynamic properties. The title problem is solved by calculating the forced vibration responses of the two-dimensional framework with time-dependent property matrices and subjected to an equivalent moving load. Improving the moving load models increases complexity as well for postulating as for obtaining the solutions from overall crane model. Comparative presentation of models is shown here with conclusion that leads to an appropriate way of model selection p...
Analytical and Finite Element In-Plane Vibration Analysis of a Gantry Crane
Machines. Technologies. Materials., 2018
Every object in nature has an infinite number of vibration frequency and amplitude as called "Natural Vibration Frequency". Developing computer capacities allow calculating of natural frequencies and shapes of complex structures more accurate and understandable. In this study, a dual-trolley (2x400 tons) heavy-duty overhead gantry crane that can carry loads up to 800 tons was analysed by mathematical and finite element methods. The mathematical method is based on Euler-Bernoulli transverse vibration approach. On the other hand, finite element method is one of the most common numerical methods that can solve many engineering problems in a range from solid mechanics to acoustic. The generated solid model was analysed by the finite element method with the help of ANSYS Workbench 14.5 which is a commonly used analysis program. The obtained values of natural frequencies at mathematical calculations and finite element analysis were compared and presented.
Dynamic responses of a gantry crane system due to a moving body considered as moving oscillator
Archives of Civil and Mechanical Engineering, 2015
This paper discusses a combined finite element and analytical method for obtaining transverse and longitudinal vibrations of a gantry crane system subjected to an elastically suspended moving body. The two-dimensional inertial effects of the moving body are included in derivation of differential equation of motion for the system. Factors as speed, acceleration and suspension characteristics of a moving body are studied, including the influence of structural damping. The obtained results validate the presented approach and can be used in the design process of gantry cranes.
Consideration of a moving mass effect on dynamic behaviour of a JIB crane structure
Tehnicki Vjesnik
This work examines the dynamics of a two-dimensional jib crane structure subjected to a moving trolley with hoist and payload. Dynamic responses of the structure, both in the vertical (Y) and horizontal direction (X), are calculated using the finite element method and the direct integration method. Instead of the conventional moving force problem, this paper deals with the two-dimensional inertial effects due to the masses of trolley, hoist and payload. For this purpose, the has been used to give contribution to the overall mass matrix of the entire system. The title problem was solved by calculating the forced vibration responses of the jib crane structure with time-dependent overall mass while subjected to an equivalent moving force. Factors as magnitude, speed and acceleration of the moving trolley were studied as well. Numerical results reveal that the approach used herein is usefull and can be used to draw conclusions for the structural design purposes of jib cranes.
2007
In this work paper we will study the dynamic behavior of the tower crane during the horizontaltranslational movement of the load hanging in the crane's boom. Using computer simulations of the crane's virtual model, we will study the influentia of this motion in the crane's construction when fully engaged with load. We will try to find how does the load swinging effect the carrying construction, what happens when load stops somewhere in the crane's boom and at the peak point, and how does this effects some main parts of crane. For this case we created virtually a whole Tower Crane using Finite Elements and model design application MSC.VisualNastran [4]. Dimensions are from standard manufacturers and using DIN 44 [1]. The results will give us a better view about the dynamic occurrences caused by the load horizontal movement.
Mathematical and s-models of cargo oscillations during movement of bridge crane
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2019
The effectiveness of research on the basis of mathematical models (linear, nonlinear) describing the dynamics of bridge cranes and cargo oscillations during transitional modes of movement, increases significantly with the use of numerical methods and simulation models created by visual programming tools. Purpose. To develop and evaluate proposed simulation models of bridge crane dynamics. methodology. On the basis of wellknown mathematical models, simulation models of the "bridge crane (trol ley)-cargo on a flexible suspension" system are developed. The simulation models are created using the visual pro gramming tools of the SIMULINK application running on the MATLAB system. Simulink libraries and DSP System Toolbox components are used in the simulation. findings. Smodels of cargo oscillations during the bridge crane movement have been developed and adjusted. A comparative analysis of the proposed models has been performed. originality. With the help of SIMULINK visual programming tools for the first time we received a set of simula tion models of cargo oscillations during the transition modes of the bridge crane movement for linear and nonlinear formulation of the task. Practical value. The proposed smodels allow automating and visualizing studies of dynamics of bridge crane movement in order to determine their rational kinematic and dynamic characteristics. The models are provided with examples of calculation of dynamic motion modes.
Dynamic analysis of the crane with loading-unloading trolley on the slewing platform
IMK-14 - Istrazivanje i razvoj, 2015
Dynamic processes of the cranes with loading-unloading trolley on slewing platform are very complex and require certain simplifications, although efforts should be made to theoretically involve widest range of impacts, with respect to degree of importance of individual impacts. The study of the dynamic behavior of the cranes is very important in terms of precise determination of stress state, as well as the other characteristics of the elements and supporting structures. Dynamic loads of the cranes occur during periods of non-stationary operating regimes of any of its mechanisms. In this paper, we obtain the differential equations of motion of the cranes for some specific cases of movement, based on general multi-mass model of the crane with loading-unloading trolley on slewing platform.
Static Analysis of Gantry Crane—Preliminary Study
DEStech Transactions on Engineering and Technology Research
The article deals with the static analysis of truss structures, focused on the specification of maximum load applied at the gantry crane. Due to the verification of authors' computer skills in software Robot Structural Analysis, the simple planar truss structure was investigated at which also analytical method was used. The results were comparable, so the gantry crane as 3D truss could be preliminary studied. The first strain analysis of crane has shown that the primary design of the structure was not acceptable and the construction would not be able sustain nor own hoist. Therefore, the truss was reinforced by additional bars and new remodelled gantry crane could be tested to specify the maximum load of external weight.