The effect of a trailer in car vibrations (dedikált példány) [antikvár]

D^./ni-j/ft).THE EFFECT OF A TRAILER ON CAR VIBRATIONSL. Kádár and T. PéterDepartment of Automobile Engineering, Technical University, Budapest Received May 20, 1982 Presented by Prof. Dr. L. IlosvaiMore and more passenger cars running in road traffic haul house trailers or freight trailers. House trailers hauled by passenger cars offer a cheap and comfortable accommodation for those touring by car, while the use of freight trailers suits the transport of lightweight goods.The production of trailers is technically relatively simple, therefore also in countries producing no passenger cars such as Hungary various types of trailers are built in lesser or greater series.In the design trailers are generally considered as independent units and one performs the necessary strength, shock and stability calculations on them as on special vehicles. However, the trailer and the prime mover constitute together a single vehicle set which presents various different requirements in the trailer design. In the technical literature few studies can be found on the joint dynamic conditions of passenger cars and trailers. In this domain professor Gnadler and his colleagues performed extensive research concerning the effect of the trailer on the braking and stability of the passenger car [1], [2]. No works on the special subject of analysing the trailer's effect on vibrations can be found in the available literature.The theoretical examination of the dynamics of this problem is interesting in itself but at the same time it may he of direct practical use in selecting or designing the spring characteristics of the trailer (type of tyres, spring stiffness, characteristics of dampers, etc.).From the aspect of simulating the vibrations a passenger car hauling a trailer is equivalent to a three-axle articulated bus or to a semitrailer, therefore the theoretical and practical conclusions drawn here may be of use in the examination of these vehical types too, and vice versa: test methods of articulated vehicles and semitrailers can be utilized in analysing passenger cars coupled to trailers. Internationally recognized fundamental results have been achieved on the vertical vibrations of articulated buses and semitrailers by Prof. L. Ilosvai [3]. Stability and braking of semitrailers have been analysed by E. Jawosdeak [4], M. Mitschke [5] and A. Slibar [7].