scholarly journals INVESTIGATION OF THE DYNAMIC LOADING OF A BODY OF PASSENGER CARS DURING TRANSPORTATION BY RAIL FERRY

2019 ◽  
Vol 4 ◽  
pp. 91-100 ◽  
Author(s):  
Alyona Lovska ◽  
Oleksij Fomin ◽  
Anatoliy Horban ◽  
Valentyna Radkevych ◽  
Pavel Skok ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Water Area ◽  
The Body ◽  
Passenger Cars ◽  
Software Environment ◽  
Passenger Car ◽  
Car Body ◽  
Runge Kutta Method ◽  
The Baltic ◽  
Mathcad Software

To ensure the safety of passenger carriages by rail ferries, mathematical modeling of dynamic loading is performed. The accelerations are determined as components of the dynamic load acting on the body of a passenger car. This takes into account the actual hydrometeorological characteristics of the water area of the railway ferry. The calculations are made in relation to the railway ferry "Mukran", which moves the Baltic Sea. The model takes into account that the car body is rigidly fixed relative to the deck and during the oscillations of the railway ferry follows the trajectory of its movement. The solution of the mathematical model is implemented in the Mathcad software environment using the Runge-Kutta method. It is established that the maximum value of the acceleration acting on the car body is 1.8 m/s2. Determination of the dynamic loading of the passenger car body during transportation by sea is also carried out by computer simulation. The calculations were carried out in the CosmosWorks software package using the finite element method. Numerical values and acceleration distribution fields are obtained relative to the carriage body structure of a passenger car. A modal analysis of the car body during transportation by rail ferry is carried out. The numerical values of the critical frequencies and waveforms are obtained. To check the adequacy of the developed models, a calculation is made according to the Fisher criterion. It is established that the hypothesis of adequacy is not rejected. The research will contribute to the creation of recommendations on the safety of passenger carriages by railway ferries, as well as the manufacture of their modern structures in terms of car-building enterprises.

scholarly journals A NEW FASTENER TO ENSURE THE RELIABILITY OF A PASSENGER CAR BODY ON A TRAIN FERRY

2020 ◽  
Vol 60 (6) ◽  
Author(s):  
Alyona Lovska ◽  
Oleksij Fomin
Keyword(s):  
Dynamic Loading ◽  
Operational Efficiency ◽  
The Body ◽  
Body Structure ◽  
Passenger Car ◽  
Equivalent Stresses ◽  
Hydraulic Damper ◽  
Car Body ◽  
Sea Transportation

To ensure the strength of the passenger car bodies during transportation on train ferries, it is proposed to mount fastening elements of chain binders on the body bolster beams. The principle of such an element is based on the hydraulic damper operation. The mathematic modelling was conducted in order to determine the dynamic loading on a passenger car body during sea transportation. The study established that the improvements mentioned made it possible to reduce the dynamic loading on the body during sea transportation by 30% in a comparison with that of a typical fastening scheme. The strength of an improved passenger car body was calculated. The maximum equivalent stresses in the body structure accounted for about 120MPa, i.e., they did not exceed the admissible values. The conducted research may contribute to ensuring the required strength of passenger car bodies during train ferry transportation, thus leading to a higher operational efficiency of train ferry transportation within the international transportation.

SIMULATION OF LOADING OF THE BODY OF A DOUBLE-STOREY PASSENGER CAR IN A FOCAL FIRE WITH SPECIFIED CHARACTERISTICS

2020 ◽  
Author(s):  
Dmitriy Antipin ◽  
Mihail Bulychev ◽  
Gennadiy Petrov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Carrying Capacity ◽  
Thermal Loading ◽  
The Body ◽  
Finite Element Scheme ◽  
Passenger Car ◽  
Element Scheme ◽  
Car Body ◽  
Element Method

A simplified method has been developed for assessing the loading of the load-bearing systems of passenger cars under thermal loading with a fire spot with limited properties. A system of simplifications for realizing a combustion spot is substantiated. A method for its implementation is proposed. The description of the object of research is given with the necessary thoroughness of presentation. A finite element scheme has been developed and adapted, taking into account the application of thermal loads in the system of an industrial software complex that implements the finite element method. Verification of the finite element scheme was carried out taking into account full-scale normative experiments. A conclusion is made about the possibility of the applicability of the finite element scheme for the study. Numerical experiments have been carried out to assess the carrying capacity of the body of a double-deck passenger car when it is exposed to a combustion center with known thermal parameters. The experiments were built and performed in a finite element method system. The results of simulations in the affected zone of the alleged fire were obtained for the conditional spot of its location. Comparison of the results with the static loading mode of the car body is considered. The analysis of the results obtained is carried out. A conclusion is given on the effect of a small localization fire on the carrying capacity of the car body. The proposed method is evaluated taking into account the possibility of further use

Construction of Battery Swap Station for Electric Passenger Car

2012 ◽  
Vol 253-255 ◽  
pp. 2231-2236
Author(s):  
Rong Yi Niu ◽  
Xiao Yan Yin ◽  
Ming Yu Zhao
Keyword(s):  
Electric Vehicle ◽  
Status Quo ◽  
The Body ◽  
Battery Pack ◽  
Body Structure ◽  
Passenger Cars ◽  
Passenger Car ◽  
Different Types ◽  
The Status

Basing on the status quo of the development of electric vehicle and electric vehicle’s Charging/battery swap infrastructure, Discussion and analysis is made with focus on the battery swap mode and it’s practising method of electric passenger car. According to the body structure of different types of electric passenger car and the Situation that the battery pack is equipped with, Electric passenger car are divided into two types: chassis battery type and battery rear-equipped type. Respectively, analyzed the battery swap mode for the two types of electric passenger cars; And two feasible battery swap projects are advanced , analysed and compared.Then pointed out the difficulties and problems with the construction of the battery swap station for electric passenger car; Finally, suggestions and methods to solve the problems were offered.

scholarly journals Justification of the use of square pipes in the frame of the removable roof of the open wagon

2021 ◽  
Vol 4 (7(112)) ◽  
pp. 18-25
Author(s):  
Oleksij Fomin ◽  
Alyona Lovska
Keyword(s):  
Dynamic Loading ◽  
The Body ◽  
Roof Material ◽  
Margin Of Safety ◽  
Material Intensity ◽  
Mathcad Software ◽  
Roof Design ◽  
The Mathematical Model ◽  
Typical Design ◽  
Bearing Structure

This paper reports determining the basic strength indicators for the removable roof of a railroad gondola. It has been established that the typical roof design has a significant margin of safety in the components of the supporting structure. In order to reduce the roof material intensity, the reserves of its strength have been determined and optimized based on the criterion for minimal material intensity. Pipes of square cross-section have been proposed for using as the components of the roof frame. When taking into consideration the proposed measures, it becomes possible to reduce the mass of the frame of the removable roof for a railroad gondola by almost 15 % compared to the typical design. At the same time, to apply the roof on different types of gondolas, its cantilevered parts can move in a longitudinal plane. It is possible to use deflectors on the removable roof. The roof can be attached to the body in a regular way. It is also possible to fix it using shog-connections. To substantiate the proposed solution, the strength of the improved structure of the removable roof was determined. It was established that the maximum equivalent stresses in the load-bearing structure of the removable roof did not exceed permissible ones. To define the indicators of removable roof dynamics, its dynamic loading was investigated. The calculation was performed in a flat coordinate system. The oscillations in bouncing and galloping were taken into consideration as the most common types of a railroad car oscillations when running on a rail track. The mathematical model of dynamic loading was solved in the Mathcad software package (Boston, USA). The study has shown that the acceleration of the body in the center of masses is 0.4 g and is within the permissible limits. At the same time, the ride of a railroad car is excellent. The study reported here would contribute to the improvement of the efficiency of railroad transportation.

scholarly journals FATIGUE LIFE PREDICTION OF BEARING STRUCTURE OF PASSENGER CAR BODY WITH PERFORATED SUPPORTING ELEMENTS

2019 ◽  
Vol 2019 (7) ◽  
pp. 59-65
Author(s):  
Дмитрий Антипин ◽  
Dmitriy Antipin ◽  
Светлана Ашуркова ◽  
Svetlana Ashurkova
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
The Body ◽  
Fatigue Life Prediction ◽  
Life Assessment ◽  
Design Strength ◽  
Passenger Car ◽  
Car Body ◽  
Fatigue Life Assessment ◽  
Bearing Structure

The purpose of the work is a fatigue life assessment for bearing structures of passenger car bodies with perforated supporting elements through the methods of computer mathematical modeling. The fulfilled analysis of investigations in the field of the fatigue life assessment for welded bearing structures of car bodies has shown that its assessment should be carried out in a dynamic setting with the development of a spatial dynamic model of a car body. The fatigue life assessment in the most loaded areas of perforated supporting elements in car bodies was carried out with the use of two procedures: Serensen-Kogaev procedure and Bolotin one. There are considered ten versions of supporting element perforation in a passenger car body. The development of finite element models of car bodies with the mentioned options is carried out by the example of the body of a domestic passenger car. On the basis of the design strength computation results there are defined three most loaded areas of perforated supporting elements. The refined assessment of a dynamic stressed state of the areas under investigations is carried out through the method of an area successive accentuation. As a result of the investigation there are obtained life values of the most loaded areas for a passenger car body bearing structure for all perforation options under consideration. The results obtained confirm passenger car operation safety with the offered option of perforation and are evidence of the purposefulness in the application of the procedure offered for the fatigue life prediction of similar bearing structures.

ASSESSMENT OF THE SAFETY OF PASSENGER CARS IN CASE OF AN EMERGENCY ROLLOVER ON THE RAILROAD TRACKS

2021 ◽  
Vol 2021 (9) ◽  
pp. 49-54
Author(s):  
Ol'ga Bondarenko
Keyword(s):  
Head Injury ◽  
Cervical Vertebrae ◽  
The Body ◽  
Railway Track ◽  
Crash Test ◽  
Passenger Cars ◽  
Flat Bottom ◽  
Passenger Car ◽  
Head Injury Criterion ◽  
Railroad Tracks

The purpose of the work is to assess the safety of passenger cars in case of an emergency rollover on the body of railroad tracks. The paper introduces a method for predicting injury of railway transport passengers as a result of swinging over the wagon on the body of railroad tracks. The method of research is mathematical modeling of scenarios of swinging over the wagon on a flat bottom or earth tramp of the railway track. A model of a passenger compartment has been developed, which is supplemented with models of a roomette, hand luggage and an anthropometric dummy. The originality of the work is the use of mannequin models for an accident with the rollover of a compartment car on the body of the railroad tracks and obtaining data on the interaction of fit models and a compartment car. The result of the study is the reported values of possible injury to passengers during an emergency rollover of a passenger car. Namely, the values of the head injury criterion, cervical vertebrae, breast and hips of the crash test dummy have been obtained. In comparison of the two considered scenarios of swinging over the wagon, the value of the head injury criterion for overturning the car on an inclined surface is 15% higher, the neck injury criterion is 30% higher, and the hip and chest injury criterion is 23% higher for mannequins on the upper shelves of the compartment due to their interaction with hand luggage. The obtained values do not exceed critical ones. The most dangerous positions of the mannequin model in the compartment of the car are revealed. Conclusions concerning the sufficient safety of the passenger car are formed and recommendations for the development of additional technical solutions to improve the safety of passenger cars are given.

scholarly journals SUBSTANTIATION OF DESIGN SOLUTIONS FOR PASSENGER CAR BODY BEARING STRUCTURES WITH PERFORATED REINFORCING ELEMENTS

2019 ◽  
Vol 2019 (6) ◽  
pp. 69-76
Author(s):  
Светлана Ашуркова ◽  
Svetlana Ashurkova ◽  
Дмитрий Антипин ◽  
Dmitriy Antipin
Keyword(s):  
Finite Element ◽  
Model Development ◽  
Element Model ◽  
Structure Design ◽  
The Body ◽  
Passenger Car ◽  
Design Models ◽  
Car Body ◽  
Body Design ◽  
Bearing Structure

As a method of investigations there is adopted a computer mathematical modeling based on the use of a finite element method. The choice of a type and perforation parameters is connected with the problem in the large array creation of bearing structure design models of passenger car bodies. The analysis of investigations carried out in the field of multi-variation computations has shown that the most efficient investigation method is a superelement reduction. Its use allows decreasing labor and time costs for the body design model development at the expense of the initial super-element with the perforation area for a new one. The appraisal of the procedure offered on the choice of a body efficient bearing structure with the perforated profiles is carried out by the example of the body of a domestic passenger car according to the criteria of strength and assurance of the highest weight reduction of a bearing structure. In the first stage of the work there are defined types and parameters of perforation possible for use in the structure. Finite element design models of car bodies are developed. On the basis of strength computation results the reinforcing elements of the structure are offered which have a margin safety for perforation application in them. Based on the analysis of car body bearing structure there is carried out a choice of an efficient unit of a finite element model which will be used as a super-element. In the next stage of the work there are developed and computed structures of car bodies with the perforation types under consideration and with the use of superelements. The computation results have shown that maximum design stresses of car bodies for all perforation types under consideration do not exceed legitimate values. As an efficient bearing structure of a passenger car body there is adopted a car body with the sixth type of perforation ensuring the largest decrease of structure metal intensity and satisfying strength requirements. The procedure developed can be used at designing modern bearing structures of passenger car bodies having improved technical and economic values.

scholarly journals Research of the Vertical Dynamics of the Supporting Structures of Freight Cars Made of Round Pipes

2021 ◽  
pp. 104-114
Author(s):  
O. V. Fomin ◽  
A. O. Lovska
Keyword(s):  
Mathematical Modeling ◽  
Dynamic Loading ◽  
Software Package ◽  
Equations Of Motion ◽  
Mass Center ◽  
Runge Kutta Method ◽  
Spring Suspension ◽  
The Creation ◽  
Mathcad Software ◽  
Supporting Structures

Purpose. This study is aimed at determining the vertical dynamics of supporting structures of freight cars made of round pipes. Methodology. Mathematical modeling of the dynamic loading of the supporting structures of the main types of freight cars made of round pipes (gondola car, covered car, flat car, hopper car) was carried out. The studies were carried out in a plane coordinate system – the XZ plane. At the same time, it was taken into account that the car is moving in an elastic-viscous track so that the reactions of the track are proportional to both its deformation and the rate of this deformation. The studies were carried out for the case of empty cars. The joint inequality is described by a periodic function. The calculation was performed at a speed of 80 km/h. Differential equations of motion were solved in the MathCad software package using the Runge-Kutta method. Findings. Based on the mathematical modeling of the dynamic loading of the supporting structures of cars made of round pipes, the main indicators of their dynamics were obtained: accelerations acting on the supporting structures in the mass center, forces acting in the spring suspension of bogies, dynamics coefficients. For gondola car, covered car, and hopper car, the acceleration at the mass center of the supporting structure is within 0.4 g, and for a flat car – 0.5 g. It was found that the obtained indicators of the dynamics of cars made of round pipes are within the permissible limits. The accelerations acting on the supporting structures of cars made of round pipes are almost the same as those obtained for prototype cars. At the same time, the motion of cars is assessed as "excellent" for gondola car, covered car, and hopper car and "good" for flat car. Originality. Mathematical modeling of the dynamic loading of the supporting structures of cars from round pipes was carried out and the main indicators of their dynamics were obtained. Practical value. The research carried out will contribute to the creation of recommendations for the design of supporting structures of freight cars of round pipes, and can also be useful developments in the creation of innovative car designs.

scholarly journals MODELING OF VIBRATION PROCESSES OF PASSENGER CAR BODY

2021 ◽  
Author(s):  
Dmitriy Antipin ◽  
Nikolay Lukashov ◽  
Elena Lukashova
Keyword(s):  
Computer Modeling ◽  
Human Body ◽  
Rail Transport ◽  
The Body ◽  
Passenger Car ◽  
Car Body ◽  
Modes Of Vibration ◽  
Negative Effect

The quality of rail transport largely depends on the comfortable and safe movement of passengers. By the method of computer modeling, the frequencies and modes of vibration of the body, which have a negative effect on the human body, were found.

Design and operation of a tripod walking robot via dynamics simulation

Robotica ◽  
2010 ◽  
Vol 29 (5) ◽  
pp. 733-743 ◽  
Author(s):  
Conghui Liang ◽  
Hao Gu ◽  
Marco Ceccarelli ◽  
Giuseppe Carbone
Keyword(s):  
Mechanical Design ◽  
Low Cost ◽  
Three Dimensional ◽  
The Body ◽  
Dynamics Simulation ◽  
Walking Ability ◽  
Walking Robot ◽  
Three Dimensional Model ◽  
Software Environment ◽  
Leg Mechanisms

SUMMARYA mechanical design and dynamics walking simulation of a novel tripod walking robot are presented in this paper. The tripod walking robot consists of three 1-degree-of-freedom (DOF) Chebyshev–Pantograph leg mechanisms with linkage architecture. A balancing mechanism is mounted on the body of the tripod walking robot to adjust its center of gravity (COG) during walking for balancing purpose. A statically stable tripod walking gait is performed by synchronizing the motions of the three leg mechanisms and the balancing mechanism. A three-dimensional model has been elaborated in SolidWorks® engineering software environment for a characterization of a feasible mechanical design. Dynamics simulation has been carried out in the MSC.ADAMS® environment with the aim to characterize and to evaluate the dynamic walking performances of the proposed design with low-cost easy-operation features. Simulation results show that the proposed tripod walking robot with proper input torques, gives limited reaction forces at the linkage joints, and a practical feasible walking ability on a flatten ground.

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