CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION
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...
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Federal Scientific Agroengineering Centre VIM
2017-12-01
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doaj-123fbee8f4ba404c92a90059194d5f7d2021-07-28T16:21:31ZrusFederal Scientific Agroengineering Centre VIMСельскохозяйственные машины и технологии2073-75992618-67482017-12-01063810.22314/2073-7599-2017-6-3-8211CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTIONZ. A. Godzhaev0A. Yu. Izmaylov1L. A. Mikholap2Federal Scientific Agricultural Engineering Center VIMFederal Scientific Agricultural Engineering Center VIM4th State Joint Testing Ground of Ministry of Defence of the Russian FederationThe 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 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 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.https://www.vimsmit.com/jour/article/view/213low-tonnage roadtraihitch-couplingflexible controlled couplermaneuverability |
collection |
DOAJ |
language |
Russian |
format |
Article |
sources |
DOAJ |
author |
Z. A. Godzhaev A. Yu. Izmaylov L. A. Mikholap |
spellingShingle |
Z. A. Godzhaev A. Yu. Izmaylov L. A. Mikholap CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION Сельскохозяйственные машины и технологии low-tonnage roadtrai hitch-coupling flexible controlled coupler maneuverability |
author_facet |
Z. A. Godzhaev A. Yu. Izmaylov L. A. Mikholap |
author_sort |
Z. A. Godzhaev |
title |
CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION |
title_short |
CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION |
title_full |
CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION |
title_fullStr |
CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION |
title_full_unstemmed |
CONDITIONS FOR SAFETY OPERATION AND MANEUVERABILITY OF LOW-TONNAGE ROADTRAIN AT CRITICAL RATES OF MOTION |
title_sort |
conditions for safety operation and maneuverability of low-tonnage roadtrain at critical rates of motion |
publisher |
Federal Scientific Agroengineering Centre VIM |
series |
Сельскохозяйственные машины и технологии |
issn |
2073-7599 2618-6748 |
publishDate |
2017-12-01 |
description |
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 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 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. |
topic |
low-tonnage roadtrai hitch-coupling flexible controlled coupler maneuverability |
url |
https://www.vimsmit.com/jour/article/view/213 |
work_keys_str_mv |
AT zagodzhaev conditionsforsafetyoperationandmaneuverabilityoflowtonnageroadtrainatcriticalratesofmotion AT ayuizmaylov conditionsforsafetyoperationandmaneuverabilityoflowtonnageroadtrainatcriticalratesofmotion AT lamikholap conditionsforsafetyoperationandmaneuverabilityoflowtonnageroadtrainatcriticalratesofmotion |
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1721267365523488768 |