Instrument accuracy influence on kinematics of rotary traverse of axial gear set with horizontal jet thrust in a group tractive drive of a lokomotive

2017 ◽  
pp. 256-266
Author(s):  
Victor Kruchek ◽  
Andrey Yevstafiyev
Keyword(s):  
Practical Importance ◽  
Linear Displacement ◽  
Knowledge Application ◽  
Angular Velocities ◽  
Analytical Research ◽  
High Dynamic ◽  
Methods Analytical ◽  
The Given ◽  
Production Tolerance ◽  
Instrument Accuracy

Objective: To obtain analytical responses of linear and angular movements of horizontal jet thrust and axial reduction unit, appearing in the process of their production and group tractive drive assembly, occurring as a result of vertical wheelset and engine’s undercarriage frame shifts during engine movement. The given responses are the basis for identifying its velocity, acceleration, and dynamic loads on drive components, as well as searching for methods to boost drive components reliability, taking into account its constructive specificities and running conditions. Methods: Analytical responses were identified on the basis of higher mathematics, the laws of theoretical mechanics as well as trigonometry knowledge application. Results: Analytical responses of kinematic spatial movements of horizontal jet thrust and an axial reduction unit with instrument accuracy of a group tractive drive were obtained from vertical engine’s undercarriage frame shifts and locomotives wheelset. Boundary conditions of jet thrust slopes were detected, as well as center lines of axial reduction units. The analysis of established relations was performed. Possible scheme variants of spatial movements of horizontal jet thrust and a wheel set axial reduction unit in engine’s undercarriage frame were presented with possible discrepancies of linear dimensions from production tolerance. Characteristic curves of vertical shifts of actual towline constructions from vertical shifts of undercarriage frame during locomotive’s movement were graphed. Practical importance: On the basis of obtained relations the analysis of linear displacement, angular velocities and accelerations of jet thrusts and wheel set axial reduction units is possible, as well as the generation of rational and robust wheel set cardan tractive gear constructions for locomotives with minimal dynamic load on its elements. The results of analytical research might be applied in the designing of new engines with high dynamic parameters.

Computing Model for Vibratory Digging-Out of Sugar Beet Roots

2014 ◽  
Vol 1 (2) ◽  
pp. 52-60
Author(s):  
V. Bulgakov ◽  
V. Adamchuk ◽  
H. Kaletnyk
Keyword(s):  
Differential Equations ◽  
Sugar Beet ◽  
Vertical Plane ◽  
Forward Motion ◽  
Admissible Velocity ◽  
Beet Root ◽  
Optimum Speed ◽  
Analytical Research ◽  
Sugar Beet Root ◽  
The Given

The new design mathematical model of the sugar beet roots vibration digging-out process with the plowshare vibration digging working part has been created. In this case the sugar beet root is simulated as a solid body , while the plowshare vibration digging working part accomplishes fl uctuations in the longitudinal - vertical plane with the given amplitude and frequency in the process of work . The aim of the current research has been to determine the dependences between the design and kinematic parameters of the sugar beet roots vibra- tion digging-out technological process from soil , which provide the ir non-damage. Methods . For the aim ac- complishment, the methods of design mathematical models constructing based on the classical laws of me- chanics are applied. The solution of the obtained differential equations is accomplished with the PC involve- ment. Results . The differential equations of the sugar beet root’s motion in course of the vibration digging-out have been comprised . They allow to determine the admissible velocity of the vibration digging working part’s forward motion depending on the angular parameters of the latter. In the result of the computational simula- tion i.e., the solution of the obtained analytical dependence by PC, the graphic dependences of the admissible velocity of plowshare v ibration digging working part’s forward motion providing the extraction of the sugar beet root from soil without the breaking-off of its tail section have been determined. Conclusions . Due to the performed analytical research , it has been established that γ = 13 ... 16 ° , β = 20 ... 30 ° should be considered as the most reasonable values of γ and β angles of the vibration digging working part providing both its forward motion optimum speed and sugar beet root digging-out from the soil without damage . On the ground of the data obtained from the analytical rese arch, the new vibration digging working parts for the sugar beet roots have been designed; also the patents of Ukraine for the inventions have been obtained for them.

Technical regulation for the values of hydraulic parameters of used metal pipes in order to extend the period of their use

2021 ◽  
Vol 18 (3) ◽  
pp. 421-427
Author(s):  
Oleg A. PRODOUS ◽  
◽  
Lev D. TEREKHOV ◽  
Petr P. YAKUBCHIK ◽  
Alexander S. CHERNIKH ◽  
...  
Keyword(s):  
Practical Importance ◽  
Hydraulic Calculation ◽  
Technical Regulation ◽  
Supply Networks ◽  
Steel Pipes ◽  
Head Losses ◽  
Metal Pipes ◽  
Inner Diameter ◽  
Pumping Equipment ◽  
The Given

Objective: To compare the characteristics of hydraulic potential in worn steel pipes with internal deposits subjected to cleaning by mechanical and chemical methods. Methods: Calculated dependencies are used for hydraulic calculation of new metal pipes and pipes with internal deposits. Results: A calculated dependence was obtained to determine the value of the inner diameter of pipes with any thickness of the layer of internal deposits. The concept of an efficient pipeline is introduced and a comparison made of the values of head losses in new pipes and in pipes with internal deposits. A specific practical example is considered. For the given example, compare the values of energy consumption of pumping equipment for two methods of cleaning the inner surface of pipes. Measures are indicated to ensure the efficiency of operation of water supply networks. Practical importance: It is shown that the chemical method of technical regulation of the hydraulic characteristics of new steel pipes provides an extension of the period of their further use.

scholarly journals Distributed Robust Attitude Tracking of Multiple Spacecraft with Disturbances and Unmodelled Dynamics

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Dapeng Yang ◽  
Xiangdong Liu
Keyword(s):  
Control Algorithm ◽  
Tracking Problem ◽  
Communication Graph ◽  
Tracking Errors ◽  
Attitude Tracking ◽  
Angular Velocities ◽  
Attitude Controller ◽  
Multiple Spacecraft ◽  
The Given

This paper considers the distributed robust attitude tracking problem of multiple spacecraft subject to disturbances and unmodelled dynamics. We designed a distributed robust attitude controller for each spacecraft using the relative attitudes and relative angular velocities of neighbors to ensure that the attitude tracking errors between the leader and the followers converge to zero under the condition that the communication graph among the followers is undirected and connected and at least one follower has the access to the leader. The control algorithm achieves robust attitude tracking under the existence of the disturbances and unmodelled dynamics by selecting the control gains according to the given condition.

ON ECONOMIC ASSESSMENT OF BALLASTLESS TRACK STRUCTURE EFFICIENCY

2017 ◽  
pp. 63-69
Author(s):  
Ludmila Andreyeva ◽  
Yevgeniy Svintsov ◽  
Yelena Tarasevich
Keyword(s):  
Comparative Analysis ◽  
Practical Importance ◽  
Economic Assessment ◽  
Track Structure ◽  
Advantages And Disadvantages ◽  
Ballastless Track ◽  
Study Results ◽  
Ballast Track ◽  
The Given

Objective: To describe the regulation of railroad traffic parameters in modern conditions, that lead to the necessity of putting into operation the new systems of track design, relevant for regulations in question. Methods: The method of matching, as well as the method of comparative analysis was applied in the study. Results: The advantages and disadvantages of ballastless track structure and conventional ballast track design were compared. The possibility of extensive application of ballastless track structure on modern railroads was analyzed. Practical importance: Ballastless track structure implementation will make it possible to solve practical tasks of using the given type of track design in transport construction.

Dynamic system of indices determining technical equipment of railroad infrastructure

2017 ◽  
pp. 354-363
Author(s):  
Alexander Shepel
Keyword(s):  
Dynamic System ◽  
Practical Importance ◽  
Transport Systems ◽  
Technical Equipment ◽  
Railway Stations ◽  
Systems Simulation ◽  
Necessary And Sufficient ◽  
Relationship Of ◽  
The Given ◽  
Optimum Relationship

Objective: To obtain technical equipment of infrastructure and terminal capacity relations in order to determine the necessary gridiron of tracks, as well as to assess efficiency and optimization of existing stations’ functioning. Methods: Based on synthesis and analysis of stations’ operation, as well as transport systems’ simulation modeling theory. Results: Parameters, influencing the present and designed terminal capacity, were identified. Cause-and-effect relations of events, resulting in railway machinery being brought in non-serviceable condition, are established. Dynamic system of indices was suggested, allowing for a more precise solution of the following tasks: to identify the necessary and sufficient gridiron of tracks for passing the specified amount of traffic, to assess the most probable amount of traffic at the station and its loading. Criteria of input and output flows of traffic at the station, as well as lay-over and trains' delays were stated, the former make it possible to analyze the suggested technical equipment and station functioning. Practical importance: On the basis of obtained relations it is possible to specify optimum relationship of trains’ lay-over time at station yards, the reserve of gridiron of tracks’ elements time in use and the number of routes being implemented at the station, as well as the necessary gridiron of tracks within the given аmount of train traffic. The results of the research may be applied in designing new railway stations, as well as optimization of station functioning and reconstruction of the existing stations.

scholarly journals Existence of solution to transpiration control problem

1992 ◽  
Vol 5 (4) ◽  
pp. 339-361 ◽  
Author(s):  
Guanstian Zhu ◽  
Jingang Wu ◽  
Benzhong Liang ◽  
Xinhua Ji ◽  
Xueshi Yang
Keyword(s):  
Numerical Calculation ◽  
Control Problem ◽  
High Speed ◽  
Practical Importance ◽  
Existence Of Solution ◽  
Dynamic Responses ◽  
Control Parameters ◽  
Mathematical Equations ◽  
The Given ◽  
High Speed Vehicle

Transpiration control can avoid change of the shape of a high-speed vehicle resulting from ablation of the nose, therefore also can avoid the change of the performance of Aerodynamics. Hence it is of practical importance. A set of mathematical equations and their boundary conditions are founded and justified by an example of non-ablation calculation in reference [1]. In [2], the ablation model is studied by the method of finite differences, the applicable margin of the equations is estimated through numerical calculation, and the dynamic responses of control parameters are analyzed numerically. In this paper we prove that the solution to transpiration control problem given in [1] exists uniquely under the assumption that the given conditions (i.e. given functions) are continuous.

Motion Analyses of D-Type Driving Mechanism

2013 ◽  
Vol 816-817 ◽  
pp. 786-789
Author(s):  
Shi Yi Li ◽  
Wen Pu Shi
Keyword(s):  
Numerical Method ◽  
Analytical Method ◽  
Linear Velocity ◽  
Driving Mechanism ◽  
Connecting Rod ◽  
Numerical Example ◽  
Angular Velocities ◽  
The Given

Geometric analyses and mechanical analytical method are used to study a kind of D-type driving mechanism. The theoretical formulae of computing angular velocities of the connecting rod and the rocker are given, and the linear velocity of the driving point C is obtained, and the finite differential numerical method for computing the angular velocities of the connecting rod and the rocker is also introduced. The results of the given numerical example show the feasibility of the theoretical conclusions here.

scholarly journals Diet knowledge, Self Efficacy and Motivation for Hypertension Prevention Behavior

2020 ◽  
Vol 3 (4) ◽  
pp. 533-539
Author(s):  
Donny Tri Wahyudi
Keyword(s):  
Self Efficacy ◽  
The Elderly ◽  
Preventive Behavior ◽  
Control Blood Pressure ◽  
Cross Sectional ◽  
Dietary Knowledge ◽  
Hypertension Prevention ◽  
Prevention Behavior ◽  
Analytical Research ◽  
Methods Analytical

Background: Preventive behavior requires an individual's desire and ability to be able to control blood pressure. The purpose of this research is to analyze dietary knowledge, self-efficacy and motivation towards hypertension prevention behavior in the elderly. Methods: Analytical research with cross sectional approach. Results: C-Square statistical test showed diet knowledge, motivation towards hypertension prevention behavior p = <? = 0.05. While self-efficacy of hypertension prevention behavior p => ? = 0.05. Conclusion: Knowledge of diet, motivation influences hypertension prevention behavior whereas self efficacy does not affect hypertension prevention behavior. Recommendation: It is expected to conduct further research related to the effect of social support and effective methods of providing information in increasing self-efficacy

scholarly journals XXIII.—On the Geometrical Mean Distance of Two Figures on a Plane

1872 ◽  
Vol 26 (4) ◽  
pp. 729-733 ◽  
Author(s):  
J. Clerk Maxwell
Keyword(s):  
Magnetic Measurements ◽  
Practical Importance ◽  
Great Practical Importance ◽  
Geometrical Mean ◽  
Unit Of Length ◽  
Electro Magnetic ◽  
The Given

There are several problems of great practical importance in electro-magnetic measurements, in which the value of a quantity has to be calculated by taking the sum of the logarithms of the distances of a system of parallel wires from a given point. The calculation is in some respects analogous to that in which we find the potential at a point due to a given system of equal particles, by adding the reciprocals of the distances of the particles from the given point. There is this difference, however, that whereas the reciprocal of a line is completely defined when we know the unit of length, the logarithm of a line has no meaning till we know not only the unit of length, but the modulus of the system logarithms.

Optimization of Mechanism Timing Using Noncircular Gearing

1992 ◽  
Author(s):  
Judd Bernard
Keyword(s):  
Input Function ◽  
Linear Displacement ◽  
Degree Of Freedom ◽  
Output Link ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Noncircular Gears ◽  
The Given ◽  
Crank Mechanism

Abstract A single degree of freedom mechanism whose input link is a crank driven through continuous revolutions will generate output motions dependent upon the inherent mechanism geometry. For example, the slider of a slider-crank mechanism has a linear displacement (the output motion) as a function of the crank rotation (input). Only within the realm of link proportioning can the slider crank output-input function be altered. In this investigation, the continuously rotating crank of a mechanism is rigidly attached to a gear which is one of a pair of externally meshing noncircular gears. By using noncircular gears, it will be shown that the output motion of the given mechanism can be correlated to the rotation of the mating gear to which the crank is not attached. In this fashion, the output link can then be made to execute its motion according to any prescribed law. The above technique has been implemented for the cases of a crank and rocker mechanism and a slider-crank mechanism.

Sign in / Sign up

Export Citation Format

Share Document