Improved System of a Braking Lever Transmission for Rail-Cars

2008 ◽  
Author(s):  
Guri Sharashenidze ◽  
Nikoloz Mgebrishvili ◽  
Tengiz Nadiradze ◽  
Pavle Kurtanidze
Keyword(s):  
Dynamic Model ◽  
Economic Efficiency ◽  
Traffic Safety ◽  
Mathematical Analysis ◽  
Urgent Problem ◽  
Minimum Number ◽  
New Construction ◽  
Operating Lifetime

Operating lifetime of rail-cars greatly depends on fitness of braking systems and on effectiveness of their constructions. Various braking systems are being elaborated in this trend where lever transmissions are used. Designing of a braking lever transmission for rolling stocks is a very urgent problem. A transmission should be simple and should contain minimum number of levers and hinges. Increased reliability and operating lifetime of braking lever transmissions for rail-cars are achieved in the work. A new construction of rail-car braking lever transmission is elaborated where number of levers and braking joints are decreased significantly and it ensures increase of traffic safety and economic efficiency. A calculating dynamic model of a new construction is elaborated in the work, which obey the basic provisions of mathematical analysis. Dynamical loads in joints of the construction are calculated taking into account increased wear and stresses. Accomplished work provides with possibility for solution of urgent problems. Introduction of the mentioned construction will significantly increase reliability and operating indices of modern rail-cars.

Kinematics and Dynamics Modeling of a New 4-DOF Cable-Driven Parallel Manipulator

2013 ◽  
pp. 249-265
Author(s):  
Hamoon Hadian ◽  
Yasser Amooshahi ◽  
Abbas Fattah
Keyword(s):  
Dynamic Model ◽  
Parallel Manipulator ◽  
Joint Space ◽  
Kinematics And Dynamics ◽  
Dynamics Modeling ◽  
Kinematic Constraint ◽  
Control Scheme ◽  
Minimum Number ◽  
Dynamical Properties ◽  
Computed Torque

This paper addresses the kinematics and dynamics modeling of a 4-DOF cable-driven parallel manipulator with new architecture and a typical Computed Torque Method (CTM) controller is developed for dynamic model in SimMechanics. The novelty of kinematic architecture and the closed loop formulation is presented. The workspace model of mechanism’s dynamic is obtained in an efficient and compact form by means of natural orthogonal complement (NOC) method which leads to the elimination of the nonworking kinematic-constraint wrenches and also to the derivation of the minimum number of equations. To verify the dynamic model and analyze the dynamical properties of novel 4-DOF cable-driven parallel manipulator, a typical CTM control scheme in joint-space is designed for dynamic model in SimMechanics.

The Research Status of Wheel-Rail Interaction Study under the Seismic Load Condition

2014 ◽  
Vol 919-921 ◽  
pp. 977-980
Author(s):  
Zuo Ju Wu ◽  
Zhi Jia Wang ◽  
Jun Wei Bi
Keyword(s):  
Dynamic Model ◽  
Traffic Safety ◽  
Load Condition ◽  
The Other ◽  
Seismic Load ◽  
Interaction Study ◽  
Dynamic Coupling ◽  
Coupling Interaction ◽  
Research Status ◽  
Advantages And Disadvantages

In the analysis of dynamic coupling interaction between wheel and rail, there are two kinds of models be widely applied, the Simplified dynamic model and the non-simplified dynamic model. And the calculation principles of these two models have been given in this thesis. At the same time, the calculation advantages and disadvantages also have been introduced. On the other hand, all the various factors which will affect the traffic safety have been summarized in this article, some measures also have been emphasized to avoid the derailment accident when the disaster is taking place.

COMPARATIVE ANALYSIS OF THE EFFECTIVENESS OF PREFABRICATED MONOLITHIC OVERLAPS IN THE CONDITIONS OF NEW CONSTRUCTION

2020 ◽  
pp. 26-32
Author(s):  
A.V. Brovkin ◽  
◽  
R.S. Tsybina ◽  
A.V. Krivozhina ◽  
T.R. Barkaya ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Construction Industry ◽  
Economic Efficiency ◽  
New Construction

This article provides a comparative analysis of the effectiveness of the use of prefabricated monolithic overlaps in the conditions of new construction, due to the problem in the construction industry of the economic efficiency of the applied structures of slabs Rectorlight of floors.

scholarly journals Management and economic efficiency criteria in the organization of safe rail transportation

2020 ◽  
Vol 157 ◽  
pp. 05007
Author(s):  
Liliya Kazanskaya ◽  
Elvira Shaykina
Keyword(s):  
Economic Efficiency ◽  
Traffic Safety ◽  
Safety Management ◽  
Preventive Measure ◽  
Economic Sustainability ◽  
Rail Transportation ◽  
Railway Company ◽  
Management Efficiency ◽  
And Training ◽  
Economic Criteria

Ensuring safety in rail transportation is achieved by creating a certain management structure of the company, which contributes to the improvement of economic sustainability and organization of safe traffic. The analysis of indicators to assess the state of traffic safety in JSC “Uzbekistan Temir Yullari” (the object of the study) allowed the authors to formulate the purpose of the study, which is to develop algorithms for carrying out measures to ensure traffic safety on the basis of economic criteria of management efficiency. Following stages of planning as the analysis of indicators of safety and identification of problems, analysis of causes of the identified problems, development of ideas objectives, setting measurable goals, checking the achievement of objectives, developing options for action achieve the goals. For each stage on the basis of methods of correlation, regression and factor analysis algorithms of their carrying out are developed. The concept of measures is developed to improve the economic efficiency of traffic safety management, depending on the method of management. With the functional approach, the main direction of the plan is to strengthen control, and with the process approach-the regulation of technological processes and training of production personnel. The authors believe that the implementation of the proposed recommendations for decision - making on traffic safety is a comprehensive preventive measure to ensure a guaranteed level of safety, which will improve the overall economic efficiency of traffic safety management in the railway company.

Improvement of Reliability of Executive Mechanisms of Railway Ice-Cars Compressors

2009 ◽  
Author(s):  
Guri Sharashenidze ◽  
Nikoloz Mgebrishvili ◽  
Pavle Kurtanidze ◽  
Mamuka Dolidze ◽  
Sergo Sharashenidze
Keyword(s):  
Dynamic Model ◽  
Economic Effect ◽  
Dynamical Analysis ◽  
Operating Characteristics ◽  
Dynamical Parameters ◽  
Operating Lifetime ◽  
Executive Mechanism ◽  
Functional Operation ◽  
Crank Mechanism ◽  
Original Dynamic

A compressor of the ice-car refrigerating plant is characterized by uninterrupted operation that is necessary to maintain a refrigerating cycle in the car. A problem of operating lifetime, unfailing operation and reliability of the compressor depends on functional operation of its basic executive mechanism — crank mechanism. An original dynamic model of the executive crank mechanism is elaborated by the authors. Research of dynamical parameters of the executive crank mechanism according to real dynamic model is carried out. Phenomenon of variable eccentricity caused by the wear of hinges and conditions of its existence are established. Expressions corresponding to dynamical analysis are obtained. Use of the elaborated dynamic model in modern ice-car refrigerating plants ensures a significant economic effect — it decreases: planned repair expenses of refrigerating plants and compressors, ice-car downtime. At the same time it increases the length of the repair period and improves operating characteristics.

scholarly journals System Dynamic Model of Measures for Reducing the Number of Road Accidents Due to Wrong-way Movement on Motorways

2012 ◽  
Vol 21 (2) ◽  
pp. 85-91 ◽  
Author(s):  
Darja Topolšek ◽  
Martin Lipičnik
Keyword(s):  
System Dynamics ◽  
Dynamic Model ◽  
Traffic Safety ◽  
Traffic Management ◽  
System Dynamic ◽  
System Dynamic Model ◽  
Road Accidents ◽  
High Speeds ◽  
Wrong Direction ◽  
Individual Project

This paper provides a system dynamic model for reducing the number of motorway accidents due to wrong-way driving. Motorway accidents are often fatal due to high speeds. It is therefore necessary to carry out all the possible countermeasures in order to achieve adequate traffic management. One of the reasons for motorway accidents is driving in the wrong direction. Based on the analysis of the data on motorway accidents caused by driving in the wrong direction and based on the knowledge of individual project elements of junctions and slip roads, this paper will focus on this area. The possible countermeasures, presented here for preventing drivers from driving in the wrong direction on motorways drastically reduce the number of U-turn maneuvers that result in driving in the wrong direction and influence the level of safety on motorways. With the help of this model of system dynamics the countermeasures for reducing the number of such drivers will be confirmed and their effects will be shown. KEY WORDS: traffic safety, motorway, direction, (road) accidents, measures, system dynamics

scholarly journals New reinforcement structures of reinforced concrete floor slabs and their technical and economic efficiency

2018 ◽  
Vol 196 ◽  
pp. 02027
Author(s):  
Pavel Serbinovskiy ◽  
Dmitry Mailyan ◽  
Andrey Serbinovskiy
Keyword(s):  
Reinforced Concrete ◽  
Economic Efficiency ◽  
Building Structures ◽  
Hollow Core ◽  
Existing Buildings ◽  
Advantages And Disadvantages ◽  
Floor Slabs ◽  
New Construction ◽  
Reinforcement Bar ◽  
The Given

The article deals with the new reinforcement structures of reinforced hollow core slabs, their advantages and disadvantages. Thearticle analyses their technical and economic efficiency. Along with the new construction, the reconstruction and the total renovation of existing buildings are being actively carried out. The given works are produced both for defectselimination of building structures, and for buildings re-profiling, which causes loads increase on the floors. Therefore, issues related to the reinforcement of building structures are getting more and more urgent [1-4]. Here, it is worth paying special attention to the prefabricated reinforced concrete structures. Several types of reinforcement structures for these slabs have been developed and patented [5-15]. Based on these patents, four (4) basic types of reinforcement structures were developed. In the first type, the reinforcement bar is located below the hollowness of the slab. In the second type, the reinforcement bar is located in a slot punched between the bottom of the hollowness and the bed of the slab. In the third type, the reinforcement bar is located under the bed of the slab. In the fourth type, the reinforcement bar is located at a certain distance from the bed of the slab in a monolithic rib, connected with the hollowness of the slab. The technical characteristics of reinforcement were checked and confirmed experimentally on full-scale samples. For the experiment, five series of slabs PC-42.12-6T were manufactured on the basis of the working drawings of the series 1.141-1 at.60, one series for each type of reinforcement and one for testing without reinforcement.

scholarly journals Technical and economic efficiency of bovine weighing methods

2018 ◽  
Vol 39 (3) ◽  
pp. 1167
Author(s):  
Marcos Aurélio Lopes ◽  
Juliana Aparecida Vieira ◽  
Francisco Helton Sá de Lima ◽  
Fabiana Alves Demeu ◽  
Fábio Raphael Pascoti Bruhn ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Economic Efficiency ◽  
Purchasing Cost ◽  
Tape Measure ◽  
Federal Institute ◽  
Minimum Number ◽  
Mathematical Equations ◽  
Red Angus ◽  
Time Required ◽  
Education Science

The objective of this study was to evaluate the technical and economic efficiency of different methods of cattle weighing, and to develop mathematical equations to estimate the breakeven point for the adoption of electronic weighing, i.e., to estimate how many animals are required for the acquisition and use of an electronic scale to be economically viable. The survey was conducted in confined beef cattle, from the Federal Institute of Education, Science and Technology in the south of Minas Gerais, IFSUL DE MINAS, Muzambinho Campus, from July to December 2014. Two methods of weighing cattle were evaluated: an electronic scale and a tape measure, using a barimetric tape for dairy cattle and a barimetric tape for beef cattle, and a conventional tape measure involving the conversion of centimeters into body weight using a specific table. Thirty-three animals identified with plastic ear tags were weighed using each method. Animals of the Nellore, Senepol, Girolando, and Red-angus breeds, aged 0–1, 1–2, and 2–3 years, were weighed 402 times in total. The time taken to weigh animals with the electronic scale was the lowest, followed by that with the barimetric tape, and that with conventional tape measure with conversion. The electronic scale exhibited the greatest technical efficiency, owing to the lack of error and the lowest time required to weigh animals. However, the costs associated with the use of this equipment were the highest, which depended on the purchasing cost. The mathematical equations developed will help technicians and cattle farmers to rapidly and precisely estimate the minimum number of animals that should compose a production system to ensure economic viability for the adoption of an electronic method to weigh cattle.

Kinematics and Dynamics Modeling of a New 4-DOF Cable-Driven Parallel Manipulator

2011 ◽  
Vol 1 (4) ◽  
pp. 44-60 ◽  
Author(s):  
Hamoon Hadian ◽  
Yasser Amooshahi ◽  
Abbas Fattah
Keyword(s):  
Dynamic Model ◽  
Parallel Manipulator ◽  
Closed Loop ◽  
Joint Space ◽  
Kinematics And Dynamics ◽  
Dynamics Modeling ◽  
Kinematic Constraint ◽  
Control Scheme ◽  
Minimum Number ◽  
Computed Torque

This paper addresses the kinematics and dynamics modeling of a 4-DOF cable-driven parallel manipulator with new architecture and a typical Computed Torque Method (CTM) controller is developed for dynamic model in SimMechanics. The novelty of kinematic architecture and the closed loop formulation is presented. The workspace model of mechanism’s dynamic is obtained in an efficient and compact form by means of natural orthogonal complement (NOC) method which leads to the elimination of the nonworking kinematic-constraint wrenches and also to the derivation of the minimum number of equations. To verify the dynamic model and analyze the dynamical properties of novel 4-DOF cable-driven parallel manipulator, a typical CTM control scheme in joint-space is designed for dynamic model in SimMechanics.

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