An experimental study has been conducted to investigate the effects of vane-type vortex generators in affecting the flow pattern of the wake region using a 1:20 scale tractor-trailer model. The de Haviland wind tunnel of the University of Glasgow was employed in this study. Surface oil flow visualisation, smoke visualisation and twocomponent time-averaged particle image velocimetry measurements...

A load plan specifies how freight is routed through a linehaul terminal network operated by a less-than-truckload (LTL) motor carrier. Determining the design of the load plan, a problem of service network design, is critical to effective operations of such carriers. Operations research techniques currently support load plan design, and all models in use or proposed today approximate transportat...

This study evaluated effects of trailer design and season on physical indicators of stress during loading and unloading and transport losses (dead and nonambulatory pigs) in market-weight pigs (BW = 129.6 +/- 0.40 kg). A total of 109 trailer loads of pigs (n = 17,256 pigs) from 1 farm were used in a randomized complete block design with a 2 x 4 factorial arrangement of treatments: 1) trailer de...

Jackknifing refers to the serious situation where a vehicle-trailer system enters jackknife state and vehicle trailer eventually collide if operation is not corrected. This paper considers low speed maneuvering typical of backing. Jackknife limits can vary due sideslip caused by physical interaction between vehicle, trailer, environment. Analysis kinematic model at wheels. Results indicate that...

Characters Trailer

Jackknifing is uncontrolled braking of a truck-trailer combination which causes the trailer rotates relative to tractor and as a result extends to adjacent lanes, causing in many cases sever accidents. In this paper a simple two dimensional model is presented. The model includes parameters such as truck’s and trailer’s dimensions, coefficients of friction, masses, location of the load on the tr...

In the trials of present work, a double-axle trailer with carrying capacity 6 tons and hydraulically effective mechanical brake were used as tractor towed car. There is hydraulic system on each axle agricultural trailer. order to separate axles from other, mechanically controlled 2/2 directional control valve was mounted both inlets. The study carried out at constant speed (25 km h-1), stabiliz...

Tractor-trailer vehicles are affected by jackknifing, a phenomenon that consists in the divergence of trailer hitch angle and ultimately causes vehicle to fold up. For case backward motions, which jackknifing can occur at any speed, we present control method drives along generic reference Cartesian trajectories while avoiding angle. This is obtained thanks feedback law combines two actions: tra...

This paper presents the experimental results of the tracking control of a car-trailer system. The proposed scheme involves three steps: 1) generate a path off-line using a path space iterative algorithm; 2) linearize the kinematic model about a trajectory which is constructed using the path; and 3) apply a time-varying linear quadratic regulator to track the trajectory. Experiments presented in...

Complex systems are composed of several plain interacting independent entities. Interaction between these entities creates a unified behavior at the global level that cannot be predicted by examining the behavior of any single individual component of the system. In this paper we consider a welded frame of an automobile trailer as a real example of Complex Technical Systems, The purpose of this ...