輸送帶畢業(yè)設計外文翻譯--輸送帶的二維動態(tài)特性

1、中文 中文 6680 字The Two-Dimensional Dynamic Behavior of Conveyor BeltsIr. G. Lodewijks, Delft University of Technology, The Netherlands1. SUMMARY1--------In this paper a new finite element model of a belt-conveyor system wil

2、l be introduced. This model has been developed in order to be able to simulate both the longitudinal and transverse dynamic response of the belt during starting and stopping. Application of the model in the design stage

3、 of long overland belt-conveyor systems enables the engineer, for example, to design proper belt-conveyor curves by detecting premature lifting of the belt off the idlers. It also enables the design of optimal idler spa

4、cing and troughing configuration in order to ensure resonance free belt motion by determining (standing) longitudinal and transverse belt vibrations. Application of feed-back control techniques enables the design of opti

5、mal starting and stopping procedures whereas an optimal belt can be selected by taking the dynamic properties of the belt into account.2. INTRODUCTION2--------The Netherlands has long been recognised as a country in whi

6、ch transport and transhipment play a major role in the economy. The port of Rotterdam, in particular is known as the gateway to Europe and claims to have the largest harbour system in the world. Besides the large numbers

7、 of containers, a large volume of bulk goods also passes through this port. Not all these goods are intended for the Dutch market, many have other destinations and are transhipped in Rotterdam. Good examples of typical

8、 bulk goods that are transhipped are coal and iron ore, a significant part of which is intended for the German market. In order to handle the bulk materials a wide range of different mechanical conveyors including belt-

9、conveyors is used.3--------The length of most belt-conveyor systems erected in the Netherlands is relatively small, since they are mainly used for in-plant movement of bulk materials. The longest belt-conveyor system,

10、which is about 2 km long, is situated on the Maasvlakte, part of the port of Rotterdam, where it is used to transport coal from a bulk terminal to an electricity power station. In addition to domestic projects, an incre

11、asing number of Dutch engineering consultancies participates in international projects for the development of large overland belt-conveyor systems. This demands the understanding of typical difficulties encountered dur

12、ing the development of these systems, which are studied in the Department of Transport Technology of the Faculty all its elements. These finite element models have been applied in computer software which can be used in t

13、he design stage of long belt-conveyor systems. This is called the dynamic (design) approach. Verification of the results of simulation has shown that software programs based on these kind of belt- models are quite succ

14、essful in predicting the elastic response of the belt during starting and stopping, see for example [3] and [4].The finite element models as mentioned above determine only the longitudinal elastic response of the belt. T

15、herefore they fail in the accurate determination of:? the motion of the belt over the idlers and the pulleys? the dynamic drive phenomena? the bending resistance of the belt? the development of (shock) stress waves? the

16、interaction between the belt sag and the propagation of longitudinal stress waves? the interaction between the idler and the belt? the influence of the belt speed on the stability of motion of the belt? the dynamic stres

17、ses in the belt during. passage of the belt over a (driven) pulley? the influence of parametric resonance of the belt due to the interaction between vibrations of the take up mass or eccentricities of the idlers and the

18、transverse displacements of the belt? the development of standing transverse waves? the influence of the damping caused by bulk material and by the deformation of the cross- sectional area of the belt and bulk material d

19、uring, passage of an idler? the lifting of the belt off the idlers in convex and concave curvesThe transverse elastic response of the belt is often the cause of breakdowns in long belt-conveyor systems and should theref

20、ore be taken into account. The transverse response of a belt can be determined with special models as proposed in [5] and [6], but it is more convenient to extend the present finite element models with special elements

21、 which take this response into account.3.1 THE BELTA typical belt-conveyor geometry consisting of a drive pulley, a tail pulley, a vertical gravity take-up, a number of idlers and a plate support is shown in Figure 1. T

22、his geometry is taken as an example to illustrate how a finite element model of a belt conveyor can be developed when only the longitudinal elastic response of the belt is of interest.Since the length of the belt part