CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION
CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION
Blog Article
The paper deals with the control device for a uniaxial trailer, which makes it possible to increase the maneuverability and reliability of the movement of a low-tonnage roadtrain by using flexible coupling in the hitch mechanism.This makes it possible to use roadtrain at emergency situations, in narrow urban streets, in greenhouses, livestock houses, and warehouses.This mechanism is simplicity, reliability and high maintainability, which allow to operate it when transporting radio birdman tshirt non-bump-resistant cargo of different purpose.
An application for an invention was filed with the proposed mechanism.The maximum forces in the cable, the drawbar hook and the controlled elements of the coupling were calculated in case of emergency braking with the maximum loading of the trailer in difficult road conditions.Critical turn radii were determined at different speeds and tire-to-surface friction coefficients.
A mathematical simulation of the movement of the roadtrain was performed.The device was installed and tested on the basis of the road laboratory KP-514MP based on the car Gazel 2705 with trailer IAPZ-739.Full-scale tests were carried out in various urban and field conditions with different loading of the trailer and shifts of the cargo mass center.
The cable installation in the hitch significantly changes the geometry of the movement when reversing and emergency braking.Also the jack-knifing of the roadtrain is obviated, while without a cable, there is almost always a threat of suchjack-knifing, which is highly undesirable in the transport of non-bumpresistant cargoes.This significantly affects dragon ball lg disney the active safety of the low- tonnage roadtrain, determines its braking efficiency and transverse stability of the links during the movement.
A mathematical model that had been tested experimentally was described, which makes it possible to estimate the critical turn radii during maneuvering, the conditions for emergency braking and the possibility of reversing motion.Two types of cables can be used in the flexible hitch-coupling: one is with a diameter of 9 mm and has the metallic core, another is LX-0, it consists of 46 wires with the organic core.Also other types of cables can be applicated if they withstand load of 4.
5-5.0 t.