关于混凝土泵车的主动控制研究数值模型和实验分析 毕业论文外文翻译.doc

外文翻译 ON THE ACTIVE CONTROL OF A TRUCK MOUNTED CONCRETE PUMP: NUMERICAL MODEL AND EXPERIMENTAL ANALYSIS C.Ghielmetti, H.Giberti, F.Resta Polytechnic of Milan, Mechanical Department, Via La Masa, 34 - 20156 Milan, Italy ABSTRACT In this paper the study on the behaviour of a pumping group used in industry to pump a big amount of concrete will be presented. The characteristics of the pumping group, its working and its mathematical model will be explained. Moreover numerical model results will be compare with the experimental ones. The purpose of this work is to show, through the mathematical model, the improvement of the pumping group system after the introduction of control. In detail, the aim it’s, on one hand, to optimize the mechanical lay out in order to support some requirements about concrete flux and pressure and, at the other hand, to develop and complete the control system application of a bigger work in which the pumping group is a part. INTRODUCTION The study of this pumping group is inserted to a bigger research in which, in addition to the pump, are studied the vibration problems of an associated boom. Both pumping group and boom form the complete system called “truck – mounted concrete boom pump”. In Fig 1 the 3D image of the system including the concrete vessel and the couple of cylinders and the real (test rig) pumping group are shown. In Fig 2 there’s an image of a truck on which the pumping group is linked and theres an example of mechanical boom movements. About the booms can be said that their main feature is the extent and this distance can be changed, assuming various positions, in function of the situation. There are different kinds of booms and their length is variable from a minimum of 28m to a maximum of 58m. Actually, the study of boom behaviour and booms vibration problems are doing by others bevies and some results about this problems are related in others works (A.N.Arbel, 1981; H.B.Kuntze, U.Hirsch, A.Jacubasch, F.Eberle, B.Goller, 1995).