SIMULATION OF DOOR MOVEMENT WITH A CLOSING MECHANISM

2021 ◽  
Vol 2021 (11) ◽  
pp. 4-10
Author(s):  
Aleksandr Reutov
Keyword(s):  
Mechanical Characteristics ◽  
Dynamic Models ◽  
Quality Criteria ◽  
Strong Impact ◽  
Closing Time ◽  
Door Opening ◽  
Air Resistance ◽  
The Moment ◽  
Moment Of Resistance ◽  
Closing Mechanism

The work objective is to determine the parameters of the closing mechanism that provide the specified characteristics of the door movement. Research method: computer simulation of the movement of a door with a lock mechanism as a multi-mass dynamic system, taking into account the mechanical characteristics and contact interaction of the lock mechanism. Research results and novelty. Computer dynamic models of a door with a door closer and a door with a spring have been developed. The moments of the door opening force, the closing time of the door, the angular velocity of the door at the time of impact with the frame are considered as the criteria for the quality of the door closing mechanism. Formulas are obtained that determine the permissible values of stiffness and deformation of the door closer spring according to the specified moments of the door opening force. The movement of doors with a door closer and with a spring is compared. The parameters of the closing mechanism providing the specified characteristics of the door movement of the considered example are determined. It is shown that with the same values of the opening force moments, the speed of impact with the frame in the case of the door closer is less than the door with a spring. Conclusions: The developed computer dynamic models of a door with a door closer and a door with a spring make it possible to determine the characteristics of the door movement taking into account the inertial and mechanical characteristics of the door closer and spring mechanisms. The permissible values of stiffness and deformation of the door closer spring can be determined by the specified moments of the door opening force in two positions. It is established that the forces of air resistance and friction in the hinges of the door cannot create the moment of resistance necessary for smooth closing of the door without a strong impact on the frame with a limited closing time. The quality criteria that minimize the closing time and the speed of impact of the door with the frame are contradictory. The choice of optimal parameters of the door closing mechanism is possible if one of the criteria is replaced by a restriction. The developed formulas and computer models are recommended for use in the design of devices that restrict the movement of doors.

Characterization of a Composite Material Consisting of a Polyester Resin Matrix with Reinforcement of Horsemane in Flat Tissue

2020 ◽  
Vol 995 ◽  
pp. 49-55
Author(s):  
Christian G Bautista ◽  
Patricio I. Mena ◽  
Cristian A. Paredes ◽  
Marco Antonio Paredes
Keyword(s):  
Mechanical Characteristics ◽  
Sheet Steel ◽  
Resin Matrix ◽  
Matrix Resin ◽  
Biodegradable Composites ◽  
Test Pieces ◽  
Polyester Matrix ◽  
The Moment ◽  
Made In

The manufacture of mechanical components by means of biodegradable composites is the best alternative at the moment of reducing cost and weight, maintaining the mechanical characteristics. In this work the mechanical characteristics are shown as the result of combining a polyester matrix resin with a reinforcement of animal fiber such as horsehair. The results obtained correspond to mechanical characterization tests at traction, bending and impact by dart drop according to rules ASTM D3039/D3039M-17, D7264/D7264M-15 and D5628 respectively, made in four groups of test pieces of material combining a polyester matrix resin and reinforcement of horsemane. The development of materials composed of horsehair as reinforcements offers similar mechanical characteristics with traditional materials such as sheet steel or polymers, but with a considerable weight reduction, ideal for automotive applications such as bodywork or interior parts of vehicles.

scholarly journals Adaptation of the control synthesized by the ACAR method to the control based on the implementation of the maximum principle

2018 ◽  
Vol 226 ◽  
pp. 02012 ◽  
Author(s):  
Viktor P. Lapshin ◽  
Ilya A. Turkin ◽  
Alexey A. Zakalyuzhnyy ◽  
Viktor F. Khlystunov ◽  
Gennadiy A. Kuzin
Keyword(s):  
Optimal Control ◽  
Control System ◽  
Maximum Principle ◽  
Synthesis Method ◽  
The Maximum Principle ◽  
Analytical Construction ◽  
Optimal Linear ◽  
The Moment ◽  
Moment Of Resistance ◽  
Maximum Method

A special case of synthesizing the electromechanical control system by the maximum method and using the Analytical Construction method of Aggregate Regulators (ACAR) is considered in the article. For the basis the task of synthesizing the optimal for speed electromechanical positioning system was chosen, while the moment of resistance to movement linearly depended on the output coordinate of the system, that is, on the angle of the engine rotor rotation. Synthesis of the optimal system for speed makes it possible to increase the efficiency of the entire production process in many production tasks, and the synthesis of the optimal linear control system based on the maximum principle is a fairly well-formalized problem. Here it should be noted that the procedure for synergistic synthesis of the optimal control system has no such formalization. An approach that brings together the solutions obtained by these two methods, which makes it possible to increase the efficiency of the ACAR method by adding some features of the methodology for synthesizing optimal systems by introducing nonlinearity of the “saturation” type is proposed in the article. The results obtained made it possible to formulate the following basic scientific proposition: the synthesis of a control system based on the synergetic approach makes it possible to obtain a system close to optimal (quasi-optimal, but after the modification of the synergetic synthesis method itself.) Here we also formulate the hypothesis of a connection between the time constants, using the ACAR method, with the optimal control switching time determined in the maximum method.

scholarly journals Effects of Micro-Braiding and Co-Wrapping Techniques on Characteristics of Flax/Polypropylene-Based Hybrid Yarn: A Comparative Study

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2559
Author(s):  
Wenqian Zhai ◽  
Peng Wang ◽  
Xavier Legrand ◽  
Damien Soulat ◽  
Manuela Ferreira
Keyword(s):  
Mechanical Characteristics ◽  
Tensile Tests ◽  
Strong Impact ◽  
Mass Ratio ◽  
Cover Factor ◽  
Hybrid Yarn ◽  
Before And After ◽  
Treatment Agent ◽  
Production Techniques ◽  
Yarn Production

Micro-braiding and co-wrapping techniques have been developed over a few decades and have made important contributions to biocomposites development. In this present study, a set of flax/polypropylene (PP) micro-braided and co-wrapped yarns was developed by varying different PP parameters (PP braiding angles and PP wrapping turns, respectively) to get different flax/PP mass ratios. The effects on textile and mechanical characteristics were studied thoroughly at the yarn scale, both dry- and thermo-state tensile tests were carried out, and tensile properties were compared before and after the braiding process to study the braidabilities. It was observed that PP braiding angles of micro-braided yarn influenced the frictional damage on surface treatment agent of flax roving, the cohesive effect between PP filaments/flax roving, and the PP cover factor; PP wrapping turns of co-wrapped yarn had a strong impact on the flax roving damage and the PP coverage, which further influenced the characteristics. Micro-braided yarn and co-wrapped yarn with the same flax/PP mass ratio were compared to evaluate the two different hybrid yarn production techniques; it was proven that micro-braided yarn presented better performance.

Tracking of mesoscale atmospheric phenomena in satellite mosaics using deep neural networks

2020 ◽  
Author(s):  
Kirill Grashchenkov ◽  
Mikhail Krinitskiy ◽  
Polina Verezemskaya ◽  
Natalia Tilinina ◽  
Sergey Gulev
Keyword(s):  
Neural Networks ◽  
Southern Ocean ◽  
Deep Ocean ◽  
Visual Object ◽  
Strong Impact ◽  
Deep Convolutional Neural Networks ◽  
Shirshov Institute ◽  
The Moment ◽  
Atmospheric Vortices ◽  
Atmospheric Phenomena

<p>Polar Lows (PLs) are intense atmospheric vortices that form mostly over the ocean. Due to their strong impact on the deep ocean convection and also on engineering infrastructure, their accurate detection and tracking is a very important task that is demanded by industrial end-users as well as academic researchers of various fields. While there are a few PL detection algorithms, there are no examples of successful automatic PL tracking methods that would be applicable to satellite mosaics or other data, which would as reliably represent PLs as remote sensing products. The only reliable way for the tracking of PLs at the moment is the manual tracking which is highly time-consuming and requires exhaustive examination of source data by an expert.</p><p>At the same time, visual object tracking (VOT) is a well-known problem in computer vision. In our study, we present the novel method for the tracking of PLs in satellite mosaics based upon Deep Convolutional Neural Networks (DCNNs) of a specific architecture. Using the Southern Ocean Mesocyclones database gathered in the Shirshov Institute of Oceanology, we trained our model to perform the assignment task, which is an essential part of our tracking algorithm. As a proof of concept, we will present preliminary results of our approach for PL tracking for the summer period of 2004 in the Southern Ocean.</p>

scholarly journals RESEARCH OF TECHNICAL CHARACTERISTICS OF NEW TYPES OF COUPLINGS

2020 ◽  
pp. 113-121
Author(s):  
Oleksii Tokarchuk ◽  
Yurii Polievoda
Keyword(s):  
Elastic Element ◽  
Rational Design ◽  
Experimental Studies ◽  
Bending Moment ◽  
Operational Reliability ◽  
Modern Technology ◽  
Operating Conditions ◽  
The Moment ◽  
Working Bodies ◽  
Moment Of Resistance

Dynamic loads that occur during the operation of existing couplings cause significant shock loads, which leads to rapid wear of the surfaces of the couplings and shortens the service life. Modern technology faces the task of improving the operational reliability of the working bodies and drives of machines. One way to solve this problem is to develop and use high-precision and low-dynamic safety couplings. In this regard, the question of developing new designs of safety couplings that reduce impact loads and increase the reliability and durability of machinery is relevant. The synthesis of structural and kinematic schemes of ball, cam and planetary safety couplings, the method of their calculation in combination with the nature of the change in the moment of resistance on the working body of the equipment. The article conducts a set of theoretical and experimental studies to determine their rational design, kinematic and dynamic parameters that will satisfy the operating conditions of machines and mechanisms. A force analysis of the elastic element (ring spring) was performed. The scheme of loading of an elastic element by two forces and other settlement schemes are constructed, namely: equivalent system; force diagrams for determining the load torque; force schemes for determining the unit moment; schemes of total bending moment; force schemes to determine the total unit moment. During static experimental studies of the developed ball safety couplings, the nature of their operation was established, the maximum torque at the two stages of operation of the couplings was determined and a comparative analysis between the results of theoretical and experimental studies was performed. The positive results of experimental researches of the developed coupling and theoretical positions which can be applied to a substantiation and a choice of rational parameters of the developed designs of couplings and their engineering designing were confirmed.

scholarly journals OPTIMIZATION OF RECEPTURAL-TECHNOLOGICAL PARAMETERS OF MANUFACTURE OF CELLULAR CONCRETE MIXTURE

2020 ◽  
pp. 30-36 ◽  
Author(s):  
Nataliya Alfimova ◽  
Sevda Pirieva ◽  
D. Gudov ◽  
I. Shurakov ◽  
Elena Korbut
Keyword(s):  
Production Efficiency ◽  
Mechanical Characteristics ◽  
Average Density ◽  
Concrete Mixture ◽  
Technological Parameters ◽  
Number Of Factors ◽  
Aerated Concrete ◽  
The Moment ◽  
The Impact ◽  
Cellular Concrete

aerated concrete at the moment is one of the perspective thermal insulation materials. However, the production of high-quality aerated concrete products is associated with a number of difficulties, primarily related to the features of the manufacturing technology and, in particular, to the formation of its structure during the period of gas evolution and the impact on this process of a large number of factors. The best conditions for the formation of cellular concrete are created when the maximum gas release and the optimum values of the plasticity-viscous characteristics of the aerated concrete mixture are found. Achieving optimal conditions is extremely difficult, which leads to a deterioration in the physico-mechanical characteristics of the final products. One of the ways to solve this problem is to increase the amount of mixing water, however, along with a positive effect (reducing the viscosity of the system), this leads to a decrease in the gas-holding capacity of the mixture. In this connection, the possibility of increasing the production efficiency of the cellular concrete mixture by optimizing the recipe-technological parameters was considered. With the help of the method of mathematical planning, a three-factor experiment was carried out, as the factors of variation were: the duration of the preliminary aging of the mixture, the dosage of the blowing agent and the water-hard ratio, the output parameters were the compressive strength and the average density of the final products. The obtained results made it possible to reveal the regularities of the change in the output parameters from the variable factors and to establish that the preliminary aging of the mixture before the introduction of the gassing agent positively affects the structure and, as a consequence, the physico-mechanical characteristics of the final products.

scholarly journals SIMULATION OF FORCE ACTION ON OSCILLATING PLOUGHSHARE OF HARVEST MACHINE

2020 ◽  
Author(s):  
I.N Vislousova ◽  
◽  
V.V. Kotov ◽  
O.N. Lesnjak ◽  
A.A. Matrosov ◽  
...  
Keyword(s):  
Interaction Process ◽  
Operating Speed ◽  
Force Action ◽  
Small Oscillations ◽  
Linear Dynamic ◽  
Eccentric Shaft ◽  
Axial Forces ◽  
Installation Depth ◽  
The Moment ◽  
Moment Of Resistance

The dynamics of the drive of the digging mechanism with oscillating ploughshare is investigated. To determine the input impact, a model of the ploughshare-soil interaction process is proposed, based on which the axial forces in the ploughshare connecting rods and moment of resistance on the eccentric shaft are calculated. To verify the adequacy of the model to the experiment, the analytical axial forces and the moment of resistance were compared with the force dependences obtained as a result of tensometric tests. Small oscillations in the drive are investigated on the basis of linear dynamic model. Analytical and empirical functional dependences of the amplitudes of the torques from the oscillation frequency of the drive, operating speed, and ploughshare installation depth are obtained.

scholarly journals The Impact of Rolling Stock Heterogeneity on Tram Stop Dwell Time

2021 ◽  
Vol 12 (1) ◽  
pp. 84
Author(s):  
Igor Majstorović ◽  
Maja Ahac ◽  
Saša Ahac ◽  
Silvio Bašić
Keyword(s):  
Dwell Time ◽  
Travel Speed ◽  
Influential Factors ◽  
Rolling Stock ◽  
Closing Time ◽  
Door Opening ◽  
Design Characteristics ◽  
Definition Of ◽  
The Impact ◽  
The City

The prediction of stop dwell time is a major issue in travel speed modeling, i.e., in the definition of travel time for high-frequency and high-ridership rail public transport. This is due to the numerous influential factors associated with stop dwell time, variable both in space and time, such as passenger flow, vehicle and stop design characteristics, and traffic organization. To investigate the impact of the heterogeneity of tram vehicles on stop dwell time, a survey was conducted regarding the tram network of the City of Zagreb. The dwell time at three consecutive island stops served by three different tram vehicle types was analyzed. The stops are located near the city center, in a separate tram corridor, at the far side of signalized intersections. Dwell time was determined and evaluated through the statistical analysis of observed, measured, and video-recorded data. The results show that at stops with up to 200 passengers per hour, the dwell time is around 15 s. For volumes of 20 passengers or less per tram, the dwell time is mostly affected by the tram door opening mechanism and opening/closing time. As the passenger volumes become higher, the number of doors per vehicle becomes more significant.

scholarly journals Mathematical Apparatus for the Synthesis of Composite Materials with Specified Properties

2021 ◽  
Vol 1203 (2) ◽  
pp. 022011
Author(s):  
Eugenia Budylina ◽  
Irina Garkina ◽  
Alexander Danilov
Keyword(s):  
Composite Materials ◽  
Technological Process ◽  
Cognitive Modeling ◽  
System Analysis ◽  
Mechanical Characteristics ◽  
Extreme Values ◽  
Optimization Problems ◽  
Quality Criteria ◽  
Kinetic Processes ◽  
Physical And Mechanical Characteristics

Abstract The meaning of the creation and functioning of the system is defined as the achievement of extreme values of goals that unite the individual elements of the system into a single whole. Based on this, the main system attributes of composite materials are indicated. It is assumed that the systemic effect is generated by the systemic properties of quality criteria. The implementation of the technical task is initially determined at the stage of cognitive modeling with the establishment of intensive and extensive properties with the allocation of control parameters. Based on the cognitive map, hierarchical structures of quality criteria are determined, and in accordance with the selected quality criteria, the corresponding structural schemes of the system (for each selected scale level). Further, the system's quality criteria are formalized, and mathematical models are developed in accordance with each of the criteria. The main purpose of using system analysis is to apply the general principles of decomposition of the system into individual elements and establish connections between them, in determining the research goal and stages to achieve this goal (based on solving single-criterion optimization problems using the found optimal values). The formalization of the multicriteria problem and its solution are made based on the required operational values, the type of kinetic processes of the formation of the physical and mechanical characteristics of the material (determine its structure and properties). The problem of materials synthesis is reduced to the choice of the order and type of the differential equation; parametric identification within the chosen model; comparison of experimental and model kinetic processes at a given accuracy; adjusting the model (if necessary). Therefore, it is important to interpolate the kinetic processes of the formation of the main physical and mechanical characteristics of composite materials. The technological process is considered as a complex system consisting of elements of various levels of detail: from atomic to a separate process. Decomposition of the technological process consists in dividing it into basic operations (elements): preparation of materials, mixing of components, molding of a semi-finished product, heat treatment and additional operations. The effectiveness of this approach was confirmed in the development of chemically resistant sulfur composites, epoxy composites for radiation protection, etc. The initial prerequisite was the required operational values of the material and the type of kinetic processes. The results of effective use of interpolation models (including splines) of compressive strength, heat release, and shrinkage of composite epoxy materials are presented.

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