scholarly journals Improvement of warehouse hovercraft transport devices with inclined feed channels

2021 ◽  
pp. 58-66
Author(s):  
V. A. Turushin ◽  
◽  
A. M. Redko ◽  
N. V. Turushina ◽  
◽  
...  
Keyword(s):  
Operating Costs ◽  
Support Surface ◽  
Total Resistance ◽  
Problem Statement ◽  
Friction Forces ◽  
Logistics Enterprises ◽  
Storage Area ◽  
Load Location ◽  
And Storage ◽  
Transport Device

Introduction. The paper considers the question of the directions of mechanization and automation of rack warehouses logistics. The paper considers hovercraft transport devices operating in the storage area with inclined feeding channels. The displacement of the load center relative to the geometric center of the support surface is studied. It is noted how this affects the main characteristics of the studied devices. Problem Statement. Previous studies have proved the sufficient performance of non-powered hovercraft transport devices with inclined feed channels, their safety and efficiency in the transportation of piece goods, as well as the potential for mechanization and automation of transport and storage operations in rack warehouses. The task of this work is to present a scheme of mechanization for the storage area of a rack warehouse equipped with a transport device with inclined feeding channels. Theoretical Part. In rack warehouses designed for the storage of individual goods, the receiving, storing and sending operations are in most cases carried out using carrying and lifting machines. Stacker cranes are most common, but their use requires the creation of complex and expensive systems, i.e. significant capital and operating costs. The article considers the system of mechanization of a rack warehouse with the use of hovercraft vehicles with an off-center location of the cargo. In this case, the height of the airbag depends on the eccentricity of the load location. The points of application and the values of the resistance and traction forces, torques and friction forces that affect the total resistance are shown, which are typical for such a situation Conclusion. The results of the research allow us to state that in some cases, instead of traditional transport devices, the use of hovercraft transport devices with the inclined feed channels is effective in logistics enterprises.

scholarly journals Clarification of Features of the Wheel Movement with a Perspective Constructive Scheme on a Rail

2020 ◽  
Vol 10 (19) ◽  
pp. 6758
Author(s):  
Evgeny Mikhailov ◽  
Stanislav Semenov ◽  
Sergii Kliuiev ◽  
Ján Dižo ◽  
Miroslav Blatnický ◽  
...  
Keyword(s):  
Support Surface ◽  
Relative Rotation ◽  
Friction Forces ◽  
Slippage Rate ◽  
Common Axis ◽  
Design Scheme ◽  
Axis Of Rotation ◽  
Traditional Design ◽  
Curved Track

The article presents the continuation of studies of the features of the wheel movement the traditional and perspective constructive scheme on a rail. Unlike the traditional design, the perspective constructive scheme of the wheel allows independent relative rotation of the support surface wheel and of its guide surface (flange) relative to their common axis of rotation. Previous authors’ works did not take into account the influence of the level of slippage in the main contact of the wheel with the rail on the value of the slippage rate in its flange contact. This article further examines the influence of this factor for both wheel designs. The results of the presented studies confirm the possibility of reducing slippage in the flange contact with the rail for a wheel of a promising design scheme in comparison with a traditional wheel. Reducing the power of friction forces in the contact of the wheel flange of a promising design scheme will reduce the resistance to movement of such a wheel along the rail, especially in curved track sections.

scholarly journals Benchmarking analysis for automated and non-automated container terminals

2021 ◽  
pp. 76-83
Author(s):  
А.Л. Кузнецов ◽  
А.В. Галин ◽  
В.Н. Щербакова-Слюсаренко ◽  
Г.Б. Попов
Keyword(s):  
Performance Indicators ◽  
Container Terminals ◽  
Cargo Handling ◽  
Storage Solutions ◽  
Significant Performance ◽  
Storage Area ◽  
And Storage ◽  
Typical Design ◽  
Area Planning ◽  
Electronic Document Interchange

Автоматизация контейнерных терминалов является одним из главных глобальных трендов в развитии технологий перегрузки и хранения контейнерных грузов. Системы автоматизации, применяемые на контейнерных терминалах, могут в разной степени включать в себя функции управления контейнеропотоком, планирования работы склада терминала, грузового планирования загрузки / разгрузки судов, автоматизации работы оборудования на терминале, планирования расстановки оборудования, электронного документооборота и другие. На традиционных (неавтоматизированных) терминалах большая часть перечисленных выше задач решается с непосредственным участием человека. Это приводит к неравномерности в интенсивности погрузочно-разгрузочных работ. В данной статье приводится сравнение показателей эффективности работы автоматизированных и неавтоматизированных контейнерных терминалов. Для целей сравнительного анализа применяется методика бенчмаркинга на основе обосновано выбранных показателей работы. Наиболее значимые показатели работы включают в себя напряженность работ причального фронта, частную производительность оборудования и интенсивность использования площади. Значения этих показателей сравниваются не только между автоматизированными и неавтоматизированными контейнерными терминалами, но и с типовыми показателями, используемыми при проектировании новых терминалов. Сделаны выводы и предположения о зависимостях некоторых показателей от уровня автоматизации терминала. Automatization is one of the main trends in global container handling and storage solutions. Automatization systems, applied at container terminals, may include following container flow controlling functions: storage area planning, container vessel cargo (bay) planning, cargo handling equipment, cargo handling equipment positioning, EDI (electronic document interchange), etc. Many of the functions mentioned are carried out manually at conventional non-automated container terminals. This leads to unsteadiness of cargo operation rates. This research shows the results of analytical comparison of selected KPIs (key performance indicators) of automated and non-automated container terminals. Method of benchmarking is used to compare certain KPIs. Among the most significant performance indicators are berth operations intensity, local productivity of equipment, intensity of storage area usage. These indicators are compared not only between automated and non-automated container terminals, but are also compared to typical design indicators used for drafting new terminals. A number of conclusions and suggestions about dependencies between KPIs and automatization level at container terminals is made.

scholarly journals Mitigation of Spoofing Attacks on IOT Home Networks

2019 ◽  
Vol 9 (1S) ◽  
pp. 240-245
Keyword(s):  
Internet Of Things ◽  
Elliptic Curve ◽  
Everyday Life ◽  
Elliptic Curve Cryptography ◽  
Home Networks ◽  
Computational Power ◽  
Authentication Mechanism ◽  
Storage Area ◽  
Iot Devices ◽  
And Storage

internet of things is now everywhere and even if people are aware of it or not, it is part of our everyday life. For something that is so much in pace with our life, iot collects a lot of information about our day today life, which in case of a data leak or hijacking could lead to catastrophic effects in the society. Still iot devices are not manufactured keeping in mind the security factor. This paper dives into the problem of spoofing attacks dealt by iot devices and comes up with an authentication mechanism, which uses variants of elliptic curve cryptography to protect against such said attacks without exhausting the devices in case of computational power and storage area. The experimentation clearly revealed the strength of the scheme to mitigate spoofing attacks on the iot home networks.

scholarly journals STABILITY OF VIBRATIONS OF THE TRACTOR AS A TWO-MASS MODEL WITH TWO NONLINEARITIES OF THE TYPE OF DRY FRICTION IN RESONANCE MODES

2021 ◽  
Author(s):  
E. Kalinin ◽  
◽  
Y. Kolesnik ◽  
M. Myasushka
Keyword(s):  
Differential Equations ◽  
Dry Friction ◽  
System Analysis ◽  
Nonlinear Differential Equations ◽  
Support Surface ◽  
Systems Methodology ◽  
Friction Forces ◽  
Resonance Modes ◽  
At Resonance ◽  
Relative Friction

Purpose of the study is to assess the possibility of calculating the stability of tractor oscillations as a system with nonlinearities such as dry friction due to the inverse problem. Research methods. The methodological basis of the work is the generalization and analysis of known scientific results regarding the dynamics of two-mass systems in resonance modes and the use of a systematic approach. The analytical method and comparative analysis were used to form a scientific problem, determine the goal and formulate the research objectives. When creating empirical models, the main provisions of the theory of stability of systems, methodology of system analysis and research of operations were used. The results of the study. Oscillations of the system with harmonic excitation by its base are considered (for example, the movement of a tractor on an uneven supporting surface). Oscillations of this system are described by nonlinear differential equations. To solve this equation, instead of friction dampers with friction forces, linear dampers with corresponding drag coefficients are included in the system. By solving the obtained system of linear inhomogeneous differential equations for the steady-state mode of oscillation, the amplitudes of oscillations of masses and deformation of springs with certain stiffness are determined. To clarify the effect of friction forces on mass oscillations in resonance modes, the obtained expressions were analyzed. A diagram of stability of mass oscillations in resonance modes is obtained. Conclusions. It has been established that if the coefficients of relative friction have such values that the point that is determined by them lies within the region bounded by segments 1-2 and 2-3 and coordinate axes, then during oscillations in the low-frequency resonance mode, the friction forces do not limit the increase in amplitudes fluctuations of masses, but only reduce the rate of their growth. If the point, which is determined by the coefficients of relative friction, lies in the region 1-1'-2'-3 '3-2-1, then the springs have intermittent deformation, that is, during the period of oscillation, one mass of the system has stops relative to another mass, or the last has stops relative to the support surface, or both masses move part of the period as a whole with the support surface. At resonance with a high frequency, the friction forces limit the amplitudes of mass oscillations if the coefficients of relative friction have such values that the point that is determined by them does not lie in the region bounded by segments 4-5 and 5-6 and the coordinate axes. Sections 4-5 and 5-6 define the boundaries of vibration stability at resonance (lines of critical ratios of the coefficients of relative friction).

Perancangan Ulang Tata Letak Fasilitas Gudang Klinik XYZ Menggunakan Metode Dedicated Storage

2021 ◽  
Vol 2 (1) ◽  
pp. 26
Author(s):  
Cuincen Faturendra Siboro ◽  
Erni Yusnita
Keyword(s):  
Drug Product ◽  
Storage System ◽  
Layout Design ◽  
Health Clinic ◽  
Random Arrangement ◽  
Storage Area ◽  
Semi Solid ◽  
North Sumatra ◽  
And Storage ◽  
Public Health Clinic

In a warehouse facility layout design including a health clinic, the layout design of warehouse facilities and production storage areas plays a very important role, it is impossible for the manufactured goods to be distributed directly to all customers. For this reason, there is a need for a good storage area and storage system to simplify the production process. Clinic XYZ is a 24-hour public health clinic, located in a sub-district in North Sumatra, to be precise in Medan Deli District. The problem that occurs is the random arrangement of goods in the warehouse without paying attention to storage and arrangement patterns that depend on the position of the empty warehouse. Based on observations, it is known that the time span needed to look for drugs at the clinic is too long, so this will make it difficult for employees / operators to manage the products to be stored or retrieved from the drug warehouse. One of the warehouse design methods that can be used is the dedicated storage method. Dedicated storage is a method of placing a specific location or storage area for each item stored. In this study, the types of drugs were classified into drugs, solid types of drugs, semi-solid drugs, liquid drugs and gas drugs. Based on the results obtained, the number of slots needed in the drug product warehouse is 11 slots, the total floor area needed is 13.2 m2, the area needed for storing medicinal products with an alley area is 6.8 m2, the percentage of area that is not used for storage the product in the medicinal product warehouse is 34% and the diagonal length of the hand truck when carrying the box is 1.56 m.

Seasonal Shifts in Surface Water-Groundwater Connections in a Ferricrete-Impacted Stream Estimated from Electrical Resistivity

Geophysics ◽  
2021 ◽  
pp. 1-55
Author(s):  
Ariel Rickel ◽  
Beth Hoagland ◽  
Alexis Navarre-Sitchler ◽  
Kamini Singha
Keyword(s):  
Electrical Resistivity ◽  
Surface Water ◽  
Hydraulic Conductivity ◽  
Hyporheic Zone ◽  
Time Lapse ◽  
Breakthrough Curves ◽  
Low Flow ◽  
High Discharge ◽  
Storage Area ◽  
And Storage

The efficacy of the hyporheic zone (HZ) — where surface water and groundwater mix — for processing nutrients or uptake of metals is dependent on streambed hydraulic conductivity and stream discharge, among other characteristics. Here, we explore electrical resistivity tomography (ERT) of hyporheic exchange in Cement Creek near Silverton, Colorado, which is affected by ferricrete precipitation. To quantify flows through the HZ, we conducted four-hour salt injection tracer tests and collected time-lapse ERT of the streambed and banks of Cement Creek at high and low flow. We installed piezometers to conduct slug tests, which suggested a low permeability zone at 44-cm depth likely comprised of ferricrete that cemented cobbles together. Based on the ERT, the tracer released into the stream was constrained within the shallow streambed with little subsurface flow through the banks. Tracer was detected in the HZ for a longer time at high flow compared to low flow, suggesting that more flow paths were available to connect the stream to the HZ. Tracer was confined above the ferricrete layer during both the high- and low-flow tests. Mass transfer and storage area parameters were calculated from combined analysis of apparent bulk conductivity derived from ERT and numerical modeling of the tracer breakthrough curves. The hyporheic storage area estimated at low discharge (0.1 m2) was smaller than at high discharge (0.4 m2) and residence times were 2.7 h at low discharge and 4.1 h at high discharge. During high discharge, in-stream breakthrough curves displayed slower breakthrough and longer tails, which was consistent with the time-lapse electrical inversions and One-dimensional Transport with Inflow and Storage (OTIS) modeling. Our findings indicate that ferricrete reduces the hydraulic conductivity of the streambed and limits the areal extent of the HZ, which may lower the potential for pollutant attenuation from the metal-rich waters of Cement Creek.

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