scholarly journals PROBLEMS OF DRIVE MECHANISMS OF TECHNOLOGICAL SECTION OF FIRING AND GRINDING DURING CEMENT PRODUCTION

2021 ◽  
pp. 44-50
Author(s):  
Andrii Kychma ◽  
Yurii Novitskyi ◽  
Rostyslav Predko
Keyword(s):  
Operating Conditions ◽  
Mutual Arrangement ◽  
Skew Angle ◽  
Software Environment ◽  
Cement Production ◽  
Driving Mechanisms ◽  
Axis Of Rotation ◽  
Rotary Kilns ◽  
Solid Works ◽  
Crown Gear

The analysis of conditions of long operation of driving mechanisms of technological sites of firing and grinding at cement production is carried out in the work. Typical variants of mutual arrangement of crown pair elements in case of rectilinear axis of rotation of technological unit body and axial beating of gear ring, as well as variant of mutual arrangement of crown gear elements in case of curved axis of rotation of rotary unit body are considered. A technique for determining the total angle of skew of the teeth of the crown pair, taking into account the errors of manufacture and the relative position of the wheels of the open gear. On the basis of experimental data the dependences of the total skew angle of the teeth of the crown pair as a function of the rotation angle of the gear crown are constructed and the possible range of the total skew angle under different operating conditions of the considered large rotating units is determined. To assess the stress-strain state of the elements of the ring gear mounted on the furnace body, a solid model was created in the software environment Solid Works Simulation. As an example, the dependences of the change in the magnitude of the deformation of the teeth of the toothed crown in the plane of action of a uniformly distributed normal force are determined. Practical recommendations for improving the design of the crown gear pair are offered. Keywords: rotary kilns; mills; crown gear; toothed crown; the angle of skew of the teeth; finite element method

Numerical simulation of ship propulsion transients and full-scale validation

2003 ◽  
Vol 217 (1) ◽  
pp. 41-52 ◽  
Author(s):  
U Campora ◽  
M Figari
Keyword(s):  
Full Scale ◽  
Operating Conditions ◽  
Dynamics Simulation ◽  
Normal Operation ◽  
System Response ◽  
Prime Mover ◽  
Software Environment ◽  
Simulation Code ◽  
Ship Propulsion ◽  
Wide Range

The paper describes a mathematical model for the dynamics simulation of ship propulsion systems. The model, developed in a MATLAB-SIMULINK software environment, is structured in modular form; the various elements of the system are described as individuals blocks (hull, prime mover, gear, waterjet, etc.) and linked together to take their interactions into account. In this way it is possible to characterize the dynamic behaviour of both the single component and the whole propulsion plant. The model may be used to analyse the system response at off-design and transient conditions. In particular, the developed computer simulation code may be considered as a useful tool to facilitate the correct matching of the prime mover (diesel or gas turbine) to the propulsor (waterjet or propeller) in a wide range of operating conditions. The paper shows the application of the methodology to a cruise ferry used to validate the model results through a full-scale test campaign conducted by the authors during normal operation of the ship.

Quantitative Characterization of Microsystem Dynamics

2007 ◽  
Author(s):  
Ryszard J. Pryputniewicz ◽  
Emily J. Pryputniewicz
Keyword(s):  
Computer Aided Design ◽  
Operating Conditions ◽  
Software Environment ◽  
Quantitative Characterization ◽  
Full Field ◽  
Modeling Simulation ◽  
Requirements Specifications ◽  
Physical Measurements ◽  
Measurement Methodology

Development of microelectromechanical system (MEMS) sensors for various applications requires the use of analytical and computational modeling/simulation coupled with rigorous physical measurements. This requirement has led to advancement of an approach that combines computer aided design (CAD) and multiphysics modeling/simulation tools with the state-of-the-art (SOTA) measurement methodology to facilitate reduction of high prototyping costs, long product development cycles, and time-to-market pressures while devising MEMS for a variety of applications. In this approach, a unique, fully integrated software environment for multiscale, multiphysics, high fidelity modeling of MEMS is combined with the optoelectronic laser interferometric microscope methodology for quantitative measurements. The optoelectronic methodology allows remote, noninvasive full-field-of view (FFV) measurements of deformations/motions (under operating conditions) with high spatial resolution, nanometer accuracy, and in near real-time. In this paper, both, the modeling environment (including an analytical process used to quantitatively show the influence that various parameters defining a sensor have on its dynamics — using this process dynamic characteristics of a sensor can be optimized by constraining its nominal dimensions and finding the optimum set of uncertainties in these dimensions that best satisfy design requirements/specifications) and the optoelectronic methodology are described and their applications are illustrated with representative examples demonstrating viability of the approach, combining modeling and measurements, for quantitative characterization of microsystem dynamics. These representative examples demonstrate capability of the approach described herein to quantitatively determine effects of dynamic loads on performance of selected MEMS.

Thermal Simulation Benchmark of Graphic Module Under Installed, Operating Conditions

2005 ◽  
Author(s):  
Fariborz Forghan ◽  
Gregory J. Kowalski ◽  
Mansour Zenouzi ◽  
Hameed Metghalchi
Keyword(s):  
Steady State ◽  
Computer Games ◽  
Electronic Device ◽  
Thermal Response ◽  
Thermal Simulation ◽  
Operating Conditions ◽  
Maximum Temperature ◽  
Software Environment ◽  
Transient Thermal ◽  
Graphic Module

The thermal performance of a graphic module on graphic card is theoretically and experimentally investigated. Unlike prior benchmark studies, this study involves a practical electronic device operating in a real software environment. The temperatures at five locations on the module and at one point on the board are measured as a function of time during the operation of a series of computer games. The theoretical model is developed using Flotherm to simulate the transient thermal response. There is close agreement from 3% to 10% between the numerical steady state case prediction and test data. The calculated transient trends using Flotherm model closely agree with experimental results and demonstrate the rapid increase in temperature as the number of module operations increases during the games. The results for the maximum temperature are directly linked to the software operation and exhibit a superposition type behavior in which the observed maximum operating temperature can exceed that estimated by steady state conditions. As expected, the results demonstrate that a carefully constructed thermal simulation can accurately predict the thermal response of a module under actual operating conditions.

scholarly journals Degree of Achievability of Omnidirectional Motion in Various Mobile Robot Designs: A Review

2016 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Ajju Raja Justus
Keyword(s):  
Mobile Robot ◽  
Control Mechanism ◽  
Operating Conditions ◽  
Driving Mechanism ◽  
Functional Requirement ◽  
Current Field ◽  
Driving Mechanisms ◽  
And Control ◽  
Comprehensive Study

<p>In the current field of robotics, many new robots are being developed based on different working principles. Each robot has its own strengths and weaknesses. Omnidirectional mobility is a major functional requirement for performing more complex actions. This article is a comprehensive study of some of the robots developed by different people with distinctive driving mechanisms. The actuation, driving method, operating conditions and control mechanism of all the selected robots is studied. Then finally, all the considered robots are compared based on various parameters to gauge the efficiency and degree of achievability of omnidirectional motion in each robot. Therefore, by the end of this article, we can have an understanding of how much effective each driving mechanism is in producing omnidirectional mobility.</p>

scholarly journals ЕНЕРГОСПОЖИВАННЯ НАВЧАЛЬНИХ КОРПУСІВ УНІВЕРСИТЕТУ В УМОВАХ КАРАНТИННИХ ОБМЕЖЕНЬ УКРАЇНИ

2021 ◽  
pp. 9-19
Author(s):  
VALERII DESHKO ◽  
INNA BILOUS ◽  
IRYNA SUKHODUB ◽  
TETYANA BOIKO
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Integrated Approach ◽  
Climatic Conditions ◽  
Operating Conditions ◽  
Normal Operation ◽  
Software Environment ◽  
Depth Analysis ◽  
Educational Buildings ◽  
Academic Building

Target. To analyze the features of energy consumption of the building of the educational building No. 17 of the National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" in the conditions of quarantine restrictions in the implementation of energy-saving heating schemes.Methodology. Dynamic energetic modeling of a university academic building created in the DesignBuilder software environment under normal and quarantine modes.Results. Recommendations for the implementation of energy-saving modes of heating the building of the academic building of the university during the period of distance learning when introducing quarantine restrictions in Ukraine.Scientific novelty. An integrated approach has been developed to an in-depth analysis of energy consumption under conditions of partial use of the premises of educational buildings during the quarantine period. It is substantiated that the use of premises with partial operation of the building requires additional unit costs for heating needs.Practical significance. Simulation dynamic modeling of the building's energy consumption for heating for various modes of operation and employment / use of premises of educational buildings during the quarantine period in Ukraine, the results of the study will allow to obtain a set of energy characteristics of the building as a whole and its individual rooms / zones for hourly changes in internal operating conditions and external climatic conditions. The use of the proposed scheme of operation of the heating system of the building of the educational building allows to reduce energy consumption during the heating period by 8,5% compared to energy consumption during normal operation, which is economically feasible in conditions of partial occupancy of the building during quarantine restrictions (during lockdown) and an unpredictable macroeconomic situation on the energy market, causing a trend towards an increase in prices for basic energy resources.

Application of Heat Pipes to the Uniformation of Thermal Fluxes in Industrial Exhausts

2009 ◽  
Author(s):  
Antonio Dumas ◽  
Michele Trancossi
Keyword(s):  
Low Cost ◽  
Heat Pipes ◽  
Cfd Simulations ◽  
Cement Production ◽  
Thermal Exchange ◽  
Temperature Application ◽  
Rotary Kilns ◽  
Using Data ◽  
The Mathematical Model ◽  
Thermal Shocks

This work analyses the mathematical model of thermal exchange in presence of transitory subjected to unexpected thermal shocks of indefinite duration. It investigates the industrial feasibility of heat pipes heat exchanger in order to reduce the effects of thermal shocks in industrial exhausts in plants for cement production. Low cost recovered thermal energy could be dedicated to any necessary low temperature application. The solutions of the equations, which describe the problem, are obtained in a general form. They could so be easily extended to whichever exchanger, on the base of the common, verified and validated, calculation parameters, which could be found in bibliography. A Matlab code has been produced to solve the problem. It has been validated thought CFD simulations using data of thermal shocks produced by rotary kilns.

Determination of Key Parameters Required to Optimize Calcination Process in Ferrous Metallurgy Heating Plants

2021 ◽  
Vol 316 ◽  
pp. 282-287
Author(s):  
Boris Yur'ev ◽  
Vyacheslav Dudko
Keyword(s):  
Heat Transfer ◽  
Ferrous Metallurgy ◽  
Construction Material ◽  
Heat Transfer Process ◽  
Operating Conditions ◽  
Shaft Kiln ◽  
Thermal Calculations ◽  
Carbonate Decomposition ◽  
Rotary Kilns

Lime is the product of calcination. Its formation is always related to removal of carbon dioxide generated in the course of carbonate decomposition. Ferrous metallurgy, construction material, chemical and food industry companies account for about 90 % of lime produced in the country. Ferrous metallurgy is the major consumer of commercial lime using up to 40 % of all produced lime. Currently, despite occurrence of new binding and artificially produced chemical compounds, lime remains the major chemical compound produced by the industry in terms of output. Various units (shaft, rotary tubular kilns and fluidized bed kilns) are used for calcination. Shaft kilns are used the most widely. Considering continuously growing demand for lime, the need occurs for intensification of the burning process and optimization of the shaft kiln operating conditions. This requires knowledge of calcination physicochemical and heat transfer process mechanisms. Thus, the work deals with the issues related to determination of the optimal specific fuel consumption for burning of limestone from a particular deposit. It may be done only basing on thermal calculations for an operating shaft kiln, what, in its turn, causes the need for determination of the whole set of limestone and lime heat transfer properties. The obtained work results may be used to optimize the operating conditions of not only shaft but also rotary kilns intended for limestone heat treatment.

scholarly journals Meander-Like Shape Optimization of the Stator-Rotor Platform Cavity

2018 ◽  
Author(s):  
Paht Juangphanich ◽  
Guillermo Paniagua
Keyword(s):  
Geometry Optimization ◽  
Operating Conditions ◽  
Navier Stokes ◽  
Practical Implementation ◽  
Computational Domain ◽  
Optimization Strategy ◽  
Minimum Thickness ◽  
Ansys Fluent ◽  
Driving Mechanisms ◽  
Wide Range

Recent progress in additive manufacturing has enabled opportunities to explore novel stator rim geometries which can be implemented to improve cooling strategies in turbomachinery. This paper presents a simplified stationary geometry optimization strategy to produce enhanced stator-rotor cavity sealing and highlights main driving mechanisms. The stator and rotor rims were designed using a design strategy based on inspiration from the meandering of rivers. A minimum thickness of 2mm was maintained throughout the cavity to ensure a practical implementation. The computational domain comprised of the stator outlet, hub disk leakage cavity, and rotor platform was meshed using NUMECA Int. package, Hexpress. The numerical analysis required 3D Unsteady Reynolds Average Navier-Stokes to replicate vorticial structures using Ansys Fluent. The operating conditions were representative of engine-like conditions, exploring a wide range of massflow ratios from 1 to 3%. The optimization yielded designs that provide 30% reduction in rear platform temperature while minimizing coolant massflow. The applicability of the design was compared against 3D sector in both stationary and in rotation.

scholarly journals THEORETICAL STUDY OF TERMS FOR ENSURING AN UNIFORM MOVEMENT AND SUBSTANTIATION OF BASIC PARAMETERS OF A SELF-PROPELLED SMALL-SIZED ROTARY TILLER WITH A VERTICAL AXIAL FOR HANDLING

2020 ◽  
Vol 14 (4) ◽  
pp. 59-63
Author(s):  
Vladimir Kupryashkin ◽  
Mihail Shlyapnikov ◽  
Mihail Chatkin ◽  
Sergey Glotov ◽  
Vladimir Kupryashkin ◽  
...  
Keyword(s):  
Adhesion Force ◽  
Traction Force ◽  
Rolling Resistance ◽  
Vertical Axis ◽  
Optimal Number ◽  
Operating Conditions ◽  
Design Parameters ◽  
Soil Conditions ◽  
Drag Forces ◽  
Axis Of Rotation

When performing the technological process of soil cultivation, a self-propelled rotary tiller moves due to the adhesion force of the drive wheels to the soil. Engine power is spent on overcoming rolling resistance of driving wheels, friction of the support slide on the soil and resistance to soil cutting by active working elements, and part of the power is lost in the transmission. Given the specific features of the functioning of a self-propelled small-sized rotary tiller with a vertical axis of rotation of active working units, namely its traction-drive nature of work, the equation for traction balance is a condition ensuring its uniform movement. When moving around the field of a self-propelled rotary tiller between the drive wheels and the soil, an FTK traction force arises, which is aimed at overcoming the drag forces when rolling the drive wheels FCK and overcoming the friction force Ffп of the support runner with the soil. In the process of tillage with rotor knives, forces arise, Fy1(Fy2), Fx1(Fx2). The force of gravity Fgм applied at the center of gravity also acts on the tillage aggregate, which can be decomposed into components: gravity Fgк,attributable to the drive wheels and gravity Fgф attributable to the rotary tiller. Based on the analysis of the forces acting on a self-propelled small-sized rotary tiller with a vertical axis of rotation of active working elements, the condition for uneven movement (stability of movement) is made. The solution of the equation regarding the number of rotors allows us to obtain the dependence of their optimal number on the design parameters of the cutter, operating conditions and soil conditions.

scholarly journals Simulation of a grain harvester threshing drum resource

2020 ◽  
Author(s):  
M. Podolsky ◽  
◽  
I. Lilevman ◽  
О. Lilevman
Keyword(s):  
Service Life ◽  
Computer Software ◽  
Operating Conditions ◽  
Temperature Deformation ◽  
Mutual Arrangement ◽  
Agricultural Machinery ◽  
The Real ◽  
Rolling Elements ◽  
Combine Harvester ◽  
The Difference

Abstract. A significant part of agricultural machinery has a seasonal nature of operation, when sudden failures are extremely undesirable. Proceeding from this, modeling the real operating conditions of bearings in design calculations is relevant, and the novelty of solving the problem lies in the use of modern target computer-aided design programs for this. Research goal. Theoretical determination of the service life of agricultural machinery bearings using targeted computer software, taking into account the real conditions of their operation. Making recommendations of a structural nature to eliminate factors that accelerate bearing wear and increase reliability. Methods. Mathematical modeling of the operating conditions of the bearings of the threshing drum of a combine harvester using the target software. Results. The article presents the main reasons for the premature failure of the bearing units of agricultural machinery, considers the types of methods used to calculate and simulate the operating conditions of rolling bearings, taking into account the specifics of machines and mechanisms in which they are used. On the example of the threshing apparatus of a combine harvester, an evaluation characteristic of the adaptation of the existing computer software applications for the calculation of bearings to the operating conditions of agricultural machinery has been carried out. The most reliable software application was selected, which takes into account the maximum number of factors influencing the service life of the bearing assemblies. The reason for the discrepancy between the values of the calculated and actual service life of the bearing assemblies of the threshing drum of a grain harvester is determined, which is due to the still unaccounted temperature deformation factor (drum shaft elongation), which leads to the disappearance of the thermal gap between the rings and rolling elements of the bearings decrease in the efficiency of the nodal seals. Conclusions. 1. The established dependence of the influence of the change and the difference in temperature of the constituent elements of the threshing apparatus unit on the durability of the bearings. It was found that when the difference between the temperatures of the bearing housings and the threshing drum shaft is more than 20 ° C, the thermal gap between its rings and the rolling elements disappears due to the thermal elongation of the drum shaft, which leads to the opening of the seal joints, and therefore to a decrease bearing life. A structural solution is proposed for the modernization of bearing assemblies, which achieves the leveling of the negative impact of thermal elongation of the shaft with minimized interventions in the base structure and associated material costs. A similar solution can be used in most agricultural machinery mechanisms, where, due to low rigidity or for other reasons, it is impossible to have a stable mutual arrangement of components rotating on bearings.

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