Linear Stability of Reversing a Car-trailer Combination

In this paper, we investigate the reverse motion of a car-trailer combination. The single track model of the vehicle is used with quasi-static tire model to design a simple linear feedback controller that can achieve stable reversing motion along a straight path. The linear stability of the closed-loop system is analyzed by constructing stability charts in the plane of the control gains. The effect of the reversing speed of the vehicle on the stability is also shown. In order to validate the theoretical results, laboratory experiments are carried out using a small-scale vehicle and a conveyor belt

Nyílászárók szerkezeti elemeinek hatása a teljesítményjellemzőkre I. rész. A rugalmas ütközések hatása az ablak légzárására

The windows and doors structures and their performance characteristics prescribed by European directives and determined by the new product standards play an important role in the energy balance of buildings. Between the performance features we find the air tightness of windows, which limit value required by a certain usage must be assured in the moment of installation. This research intends to investigate the influence of structural elements on windows and doors performance. The present article describes the role and effect of sealing’s on windows air tightness. A series of laboratory experiments were performed examining the influence of primary and secondary weather-strips as well as the effect of sealing’s weathering on elasticity. By removing the primary weather-strip the air tightness declined significantly at each pressure level. Opposite to this the secondary weather-strip elimination doesn’t affected considerably the air tightness at certain pressure levels. The impact of primary sealing weathering varied among the examined window types

Reversing Along a Curved Path by an Autonomous Truck–Semitrailer Combination

In this paper, the stability analysis of the reverse motion along a circular path is presented for the truck–semitrailer combination. The dynamics of the low-speed manoeuvre are investigated with the single track kinematic model, supplemented with the model of the steering system. The time delay emerging in the control loop is also considered. The actuation is achieved by the steering of the truck, for which a linear feedback controller is designed to ensure the stability of the motion, meanwhile, a geometry-based feedforward steering angle is also used to force the system to the desired path. Linear stability charts are calculated in order to properly tune the control gains of the feedback controller with respect to the curvature of the path