scholarly journals Determination of the Loading of a Flat Rack Container during Operating Modes

2021 ◽  
Vol 11 (16) ◽  
pp. 7623
Author(s):  
Oleksij Fomin ◽  
Juraj Gerlici ◽  
Glib Vatulia ◽  
Alyona Lovska ◽  
Kateryna Kravchenko
Keyword(s):  
Dry Friction ◽  
Vertical Plane ◽  
Dynamic Loads ◽  
Friction Forces ◽  
Operating Modes ◽  
Longitudinal Plane ◽  
Open Container ◽  
The Cross ◽  
Bearing Structure

This research deals with determination of the loading of an open container during operating modes. The special feature of this container is its convex walls. This engineering solution increases the useful capacity of a container by 8% in comparison to that of the prototype. The elastic elements in the bearing structure of a container were introduced to decrease the dynamic loads. The dynamic loads in the vertical plane were dumped by means of the dry friction forces between the components of the cross bearers of the container’s base. The dynamic loads in the longitudinal plane were dumped by means of the dry friction forces between the horizontal parts of fittings and fixed lashing components. This study presents the modelling of the dynamic loading of a container in a vertical plane. The dynamic loads of a container in the longitudinal plane were determined with a mathematical model. The authors determined the basic strength characteristics of the bearing structure of a container; and found that the maximum stresses to a container were about 200 MPa, concentrated near the front fittings. The maximum displacements were recorded in the cross bearers of the base and amounted to about 4 mm.

Theory of motion controllability of a wheel machine-tractor aggregate

2016 ◽  
Vol 3 (2) ◽  
pp. 3-10 ◽  
Author(s):  
V. Adamchuk ◽  
V. Bulgakov ◽  
V. Nadykto ◽  
I. Golovach
Keyword(s):  
Vertical Plane ◽  
Rectilinear Motion ◽  
Transport Mode ◽  
Longitudinal Plane ◽  
Theory Of Motion ◽  
Non Linear ◽  
Analytic Expressions ◽  
Computer Calculations ◽  
External Forces

Aim. To obtain analytically new dependencies, determining the indicator of motion controllability of a wheel machine-tractor aggregate, taking into consideration external forces, constructive and kinematic parameters of the aggregate while the latter moves in the transport mode. Methods. The methods of tractor and vehicle theories, theoretical mechanics, the theory of dynamic stability, and methods of numeric computer calculations. Results. A new theory of motion controllability of a wheel machine-tractor aggregate during its non-linear mo- tion along the surface of the soil at an angle to the horizontal was elaborated. The analytic expressions for the determination of the actual indicator of aggregate controllability, including force and constructive parameters of a machine-tractor aggregate, affecting this indicator in the longitudinal-vertical plane were made. The ana- lytic expressions were obtained for the transport mode of the aggregate movement. The conditions, in which cross slips of the directive wheels of the tractor with implements in the longitudinal plane were analytically considered for the fi rst time. The analytic expressions for the determination of the required indicator of the controllability of the machine-tractor aggregate in the longitudinal plane, excluding any possibility of a cross slip of the aggregate while turning its directive wheels at a certain angle, were defi ned. Conclusions. Computer calculations demonstrated that during the non-linear movement along the surface of the soil at an angle of 12 ° to the horizontal the wheel machine-tractor aggregate will be controllable only if the wheel turning angles for the tractor with implements do not exceed 9 ° . In case of the working motion of this aggregate along the slope, its controllability is preserved on condition that the turning angle of directive wheels does not exceed 11 ° . It was established that the controllability of the wheel machine-tractor aggregate is determined by the actual λ d and required λ о indicators of controllability, which take into consideration the values of the vertical load on the directive wheels of the power source, the possibility of their turn in the longitudinal plane, and the pull during the deviation from rectilinear motion when it moves along the surface at an angle to the horizontal.

Stability and capacity of walking mechanism for moving of excavators

2020 ◽  
pp. 47-52
Author(s):  
G. V. Kazachenko ◽  
◽  
G. A. Basalay ◽  
Keyword(s):  
Surface Deformation ◽  
Vertical Plane ◽  
Bearing Surface ◽  
Pressure Center ◽  
Friction Forces ◽  
History Of ◽  
Walking Mechanism ◽  
The Stability ◽  
History Of Engineering

The authors discuss design of waling mechanisms intended for moving of single-bucket excavators. History of engineering and application of these mechanisms is given in brief. The authors also mention relations obtained for determining pressures and deformation of bearing surface under under the walking mechanism support shoes. The stability of walking excavators is considered with an assumption that the bearing surface deformation linearly depends on the pressure transferred to it by the excavator undercarriage. To understand the changes in the pressure on the bearing surface during walking, the cam walking mechanism work diagram is shown, which is divided into four typical phases for the convenience. The shape and dimensions of the bearing surface of the excavator during walking are studied, which makes it possible to find deformation of the bearing surface under the shoes. The analysis of energy consumed to move the excavator takes into account the gravity and friction forces, as well as the energy intake to overcome the inertial forces of lift and simultaneous turn of the machine in the vertical plane. The requirements of the machine movement are: the pressure under the excavator base must be lower than the allowable pressure for rock mass composing the bearing surface under analysis; the radius of the support base should be such that the pressure center is never beyond the core of crosssection. Determination of power for the operation of the walking mechanism is based on calculation of the energy consumption for lifting the excavator and overcoming friction between the excavator base and the bearing surface. Finally, the main outcomes of the study are summarized: the operation of the walking mechanisms is associated with significant dynamic loads induced in the machine steelworks; the power required for the operation of such mechanisms undergoes significant changes during walking and is mostly spent to overcome the resistance of the machine inertia; the power consumption is mostly associated with superstructure lifting and wheel dragging along the bearing surface given there is no backward slip of the shoes.

scholarly journals LOADING ON THE CARRYING STRUCTURE OF A FLAT WAGON IN TRANSPORTATION OF MILITARY EQUIPMENT

2021 ◽  
pp. 6-19
Author(s):  
Oleksij Viktorovich Fomin ◽  
Glib Leonidovich Vatulia ◽  
Alyona Oleksandrivna Lovska
Keyword(s):  
Natural Frequencies ◽  
Computer Modelling ◽  
Vertical Plane ◽  
Dynamic Loads ◽  
Rolling Stock ◽  
Software Suite ◽  
Strategic Issues ◽  
Military Equipment ◽  
Longitudinal Plane ◽  
Mathcad Software

The article presents the results of determining the loads on the carrying structure of a flat wagon transported military equipment. The authors suggest that stable fixation of military equipment can be provided with special rings mounted on the flat wagon structure. The results of the strength calculation confirmed the efficiency of this solution. The study deals with the mathematical modelling of the dynamic loads on the carrying structure of a flat wagon with a military tank. The research was made for the plane coordinates. The following oscillations were taken into account: longitudinal plane oscillations, jumping oscillations and galloping oscillations. The differential equations were solved by the Runge–Kutta method in MathCad software suite. The maximum accelerations on the carrying structure of a flat wagon in the longitudinal plane were about 34 m/s2, and in the vertical plane were about 5.0 m/s2. Thus, these accelerations values were within the admissible ones.The study also presents the results of the computer modelling of the dynamic loads on the flat wagon. The calculations were made in SolidWorks Simulation (CosmosWorks) software suite with the finite element method. The study presents the distribution fields of the accelerations relative to the carrying structure of a flat wagon and the numerical values of these accelerations.The models of the dynamic loads on the carrying structure of a flat wagon were verified with an F-test. It has been found that the hypothesis on adequacy is not rejected.The study also included determination of the natural frequencies of the carrying structure of a flat wagon. It was found that the values of the natural frequencies were within the permissible values. This research will contribute to better operation efficiency of the rolling stock with consideration of some military-strategic issues, and will be of help for anyone concerned with development and research into innovative rolling stock structures

Modeling of Dynamic Loads on the Polished Rod of Pumping Unit in Case of Mulfunction of Rod Pump Operating

2014 ◽  
Vol 10 ◽  
pp. 95-101
Author(s):  
A.S. Topolnikov
Keyword(s):  
Multiphase Flow ◽  
Satisfactory Agreement ◽  
Model Simulation ◽  
Theoretical Modeling ◽  
Dynamic Loads ◽  
Plunger Pump ◽  
Proposed Model ◽  
Pumping Unit ◽  
Polished Rod

The paper presents the results of theoretical modeling of joined movement of pump rods and plunger pump and multiphase flow in a well for determination of dynamic loads on the polished rod of pumping unit. The specificity of the proposed model is the possibility of taking into account for complications in rod pump operating, such as leakage in valve steam, presence of gas and emulsion, incorrect fitting of plunger inside the cylinder pump. The satisfactory agreement of results of the model simulation with filed measurements are obtained.

Experimental research control methods of the spatial position of building constructions

2017 ◽  
Vol 922 (4) ◽  
pp. 7-12 ◽  
Author(s):  
G.A. Shekhovtsov ◽  
R.P. Shekhovtsova ◽  
D.P. Ivenin ◽  
O.V. Raskatkina
Keyword(s):  
Simultaneous Determination ◽  
Experimental Research ◽  
Vertical Plane ◽  
Error Theory ◽  
Spatial Position ◽  
Bridge Crane ◽  
Building Structures ◽  
Control Methods ◽  
Engineering Geodesy

The article contains the method of discrete scanning points in the vertical plane of the columns and roof trusses for the simultaneous determination of vertical columns, the distance between them in flight at their tip and deflection farms with one point standing and only one performer. The technique is based on the use of reflectorless electronic tachymeter and its SDh key. Experimental research of methods on the elements of building structures NNGASU educational housing using electronic tachymeter SET530R. Results of the experiments were monitored by a coordinate and photographic methods, as well as with the developed at the chair of Engineering Geodesy laser-mirroring device designed to measure inaccessible or hard to reach distances. Analysis methods of error theory position and the results of its comparison with other methods have shown that it provides the required accuracy, easy to perform, does not require the output of the observer on the crane path or lift to the towers, free from the multiple engagement of the bridge crane and can be successfully applied on practice.

scholarly journals Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Hirotomo Noda ◽  
Hiroki Senshu ◽  
Koji Matsumoto ◽  
Noriyuki Namiki ◽  
Takahide Mizuno ◽  
...  
Keyword(s):  
Altimeter Data ◽  
Gravity Assist ◽  
Laser Altimeter ◽  
Trajectory Error ◽  
Flight Data ◽  
Camera Image ◽  
Operation Period ◽  
The Cross ◽  
Along Track

AbstractIn this study, we determined the alignment of the laser altimeter aboard Hayabusa2 with respect to the spacecraft using in-flight data. Since the laser altimeter data were used to estimate the trajectory of the Hayabusa2 spacecraft, the pointing direction of the altimeter needed to be accurately determined. The boresight direction of the receiving telescope was estimated by comparing elevations of the laser altimeter data and camera images, and was confirmed by identifying prominent terrains of other datasets. The estimated boresight direction obtained by the laser link experiment in the winter of 2015, during the Earth’s gravity assist operation period, differed from the direction estimated in this study, which fell on another part of the candidate direction; this was not selected in a previous study. Assuming that the uncertainty of alignment determination of the laser altimeter boresight was 4.6 pixels in the camera image, the trajectory error of the spacecraft in the cross- and/or along-track directions was determined to be 0.4, 2.1, or 8.6 m for altitudes of 1, 5, or 20 km, respectively.

Analysis of Beam-Like Structures With Displacement-Dependent Friction Forces: Part I — Single-Degree-of-Freedom Model

1995 ◽  
Author(s):  
Wayne E. Whiteman ◽  
Aldo A. Ferri
Keyword(s):  
Dry Friction ◽  
Damping Ratio ◽  
Strong Dependence ◽  
Time Integration ◽  
Single Mode ◽  
Stick Slip ◽  
Friction Forces ◽  
Equivalent Damping ◽  
Damping Characteristics ◽  
Parameter Values

Abstract The dynamic behavior of a beam-like structure undergoing transverse vibration and subjected to a displacement-dependent dry friction force is examined. In Part I, the beam is modeled by a single mode while Part II considers multi-mode representations. The displacement dependence in each case is caused by a ramp configuration that allows the normal force across the sliding interface to increase linearly with slip displacement. The system is studied first by using first-order harmonic balance and then by using a time integration method. The stick-slip behavior of the system is also studied. Even though the only source of damping is dry friction, the system is seen to exhibit “viscous-like” damping characteristics. A strong dependence of the equivalent natural frequency and damping ratio on the displacement amplitude is an interesting result. It is shown that for a given set of parameter values, an optimal ramp angle exists that maximizes the equivalent damping ratio. The appearance of two dynamic response solutions at certain system and forcing parameter values is also seen. Results suggest that the overall characteristics of mechanical systems may be improved by properly configuring frictional interfaces to allow normal forces to vary with displacement.

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