25-08-2017, 09:32 PM
CALCULATIONS, MODELING AND ANALYSIS WITH FINITE
ELEMENT METHOD OF RUBBER TYRED CONTAINER STACKING
CRANE
CALCULATIONS, MODELING AND ANALYSIS.pdf (Size: 194.41 KB / Downloads: 47)
ABSTRACT
This paper presents the modeling, calculations and analysis using Finite Element Method (FEM)of
the rubber tyred container stacking crane in ports. All elements of the rubber tyred container stacking
crane was modeled and made its calculations. Although stress and deformation analysis of crane
bridge girder and buckling analysis of the crane legs are performed. ANSYS Workbench program has
been used to perform the finite element method. In addition, rubber tyred container stacking crane
has been modeled by using Autodesk INVENTOR 2010 program. Stress, deformation and buckling
analysis have been compared with calculations. The aim of this work is to consider the new
possibilities and the gains of finite element method over conventional calculation methods on rubber
tyred container stacking crane design. When we examine the results, deformation formed on crane
system is not significant when considering geometric dimensions of model and it was observed that the
stress values remain under the yield strength of the steel which is used for crane brigde and legs.
Keywords: Finite Element Method (FEM), ANSYS Workbench, Autodesk INVENTOR 2010, Stress
and Deformation Analysis, Buckling Analysis, Rubber Tyred Container Stacking Crane
1. INTRODUCTION
Lifting and transporting machines are used for moving from place to another place and storing
processes of the raw materials, semi finished and finished products in industrial plants. Cranes are a
type of lifting machinery. Cranes also participate in production processes and serve to transfer loads
from one place to another. The principal parameter of their operation is thus in the final analysis the
cost transferring loads under given conditions. The operating conditions of a crane depend on the king
and weight of loads to be transferred, the coordinates of the points of the pickup and discharge, the
intensity of the flow of the loads, location of the crane and also the effect of the environment
(temperature, wind, snow, humidity, dust content etc..). [1]This type of lifting machinery, but all loads
lifting or lowering, they also allow for horizontal movement. Movement of the loads along three axes
can be obtained as spatial. Therefore, cranes which are placed in workshops, factories, ports,
warehouse etc. are very useful and effective lifting machinery. In industrial and commerce field,
lifting and moving of the heavy loads in various way is required. In order to overcome these works,
many types of crane were developed. One of these types of cranes is rubber tyred container stacking
crane. Rubber tyred container stacking crane, containers to be loaded on ships taken from vehicles and
stacking neatly to stacked block and eliminating this intensity at ports, plays a leading role. Rubber
tyred container stacking crane is a type of portal crane.
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This crane is capable of stacking six ISO standard type containers which have maximum total weight
of 40 t over and over. Leg clearance of the crane was sized in order to stack also six containers. So we
can stack the containers six by six via this crane.
STRESS, DEFORMATION AND BUCKLING ANALYSIS WITH FINITE ELEMENT
METHOD
Stresses and deformation (displacement) are occurred on the bridge girder of the rubber tyred
container stacking cranes due to the lifting load, trolley weight, bridge girder weight and the platform
weight, the spreader weight. Crane legs are also subjected to buckling due to these loads. It has been
made deformation and stress analysis for bridge girder, buckling analysis for legs with finite element
method by using ANSYS Workbench program.
When considered the stress and deformation analysis, it has been used St 52-3 material for the
construction of bridge girder. Therefore material properties are such as material density is 7850 kg/m3,
modulus of elasticity 210 GPa, poisson’s ratio 0.3.
After modeling the bridge girder, it has been imported to Workbench, select the static structural
section for analysis and then defined the material properties mentioned above. Then we assigned the
mesh by using Mesh/sizing. Until getting the best value, mesh size is reduced. After that two ends of
the bridge girder are fixed (constraints defined) and applied the loads. One of the loads is caused by
the lifting load, trolley weight and the spreader weight. The other load is caused by the bridge girder
and platforms weight. After applying the loads, defined values that required the results such as total
deformation and von-misses stresses. Finally it is solved and showed the results. The results of the
stress and deformation analysis are as following. Figure 1 shows the stress and deformation result of
the bridge girder or the rubber tyred container stacking crane.
RESULTS
This paper presents modeling, calculation and stress, deformation and buckling analysis of the rubber
tyred container stacking crane. As a result compare calculation and analysis. For comparing the stress
and deformation analysis and the calculation show in Table 2. Examining the results the stress value is
201.83 N/mm2 (Figure 3.) for the analysis but stress value is equal to 204.56 N/mm2 from the
calculation. If compare the deformation results between analysis and calculation, the analysis result is
11.706 mm and the calculation result is 15.27 mm(Figure 3). There is no significant difference
between the analysis and calculation result for the stresses and deformations. Therefore analysis result
can be taken into consideration.