scholarly journals Тhe operability analysis of spindle-motor hybrid electromechanical systems

2021 ◽  
Vol 5 (1) ◽  
pp. 89-96
Author(s):  
Katerina Oliinyk
Keyword(s):  
Spindle Motor ◽  
Machine Building ◽  
Magnetic Suspension ◽  
Synthesis Methods ◽  
Hydraulic Systems ◽  
Electromechanical Systems ◽  
Design Concepts ◽  
Morphological Model ◽  
Functional Features ◽  
Electromagnetic Calculations

Motor-spindles are belong to a special class of complex dynamic systems of natural and natural-anthropogenic origin, which can be realized both translational and rotational motion, and represent a variety of developing species. Such systems are used in metalworking complexes, lathes, milling, drilling, grinding, multi-purpose and other machines. In modern designs of spindle units rolling bearings, hydrostatic, hydrodynamic, gas-static (aerostatic), gas-dynamic (aerodynamic), magnetic bearings and their combinations (hybrids) are used, for example, gas-magnetic (gas-static bearings with a magnetic suspension that allows to provide rotational frequencies) up to 10-20 thousand rpm, and in drilling and milling and grinding up to 100-200 thousand rpm and above. With the further development of technology in the machine-building industry, motor-spindles began to appear, which are able to realize the movement of the feed by means of gears and couplings, using pneumatic systems. They are also able to realize the movement of in using hydraulic systems, using screw gears. The design concepts of hybrid and combined the motor spindles, received by results of structural anticipation on the basis of use of innovative synthesis methods of hybrid electromechanical systems are considered. Results of mechanical calculations of rigidity and electromagnetic calculations are presented in the article.  On the ground of the calculation data the operability analysis of the electromechanical systems of motor spindles is made. To develop a morphological model, functional features were selected, which are systematized and divided into three groups in accordance with the modular principle.

Successful Moveable Bridges

2019 ◽  
Author(s):  
Kjeld Thomsen ◽  
Christian Riis Petersen
Keyword(s):  
Operation Time ◽  
Cost Effective ◽  
Modern Technology ◽  
Point Of View ◽  
Maintenance Cost ◽  
Hydraulic Systems ◽  
Design Concepts ◽  
Electrical Systems ◽  
Low Weight ◽  
Selection Of

<p>The present paper describes developments in the design of the most common types of movable bridges – Bascule bridges and Swing Bridges. The selection of design concepts is influenced by span, foundation conditions as well as environmental issues. Application of modern hydraulic systems and innovative bearing types for swing bridges facilitate the creation of outstanding designs. Recently built moveable bridges in Denmark exemplifies the trend and how application of modern technology and creativity can lead to outstanding solutions. There are many governing parameters such as the span, free opening height and loading conditions. Equally important issues such as surroundings, landscape, foundation conditions, requirement to low weight, achievable tolerances and from a mechanical point of view, the operation time. Risk assessment, mechanical- and electrical systems and the requirement to operation time and maintenance cost, will have influence on the selection of machinery and the architectural and structural design. For each of the moveable bridges described, it is shown how innovative application of modern bearing concepts and hydraulic systems can lead to elegant and cost-effective solutions.</p>

scholarly journals Learning the basics of a battery pack control system

2020 ◽  
Vol 164 ◽  
pp. 13006 ◽  
Author(s):  
Kirill Kobzev ◽  
Sergey Vyalov ◽  
Alexander Rybak
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Numerical Experiment ◽  
Structural Parameters ◽  
Operation Mode ◽  
Power Source ◽  
Design Parameters ◽  
Hydraulic Systems ◽  
Original Design ◽  
Functional Features

The article discusses the control system of a hydraulic power source of constant pressure, which is a pump-storage power source, equipped with the original design of the automatic unloading of the hydraulic pump, which provides relay switching of its operation mode. A mathematical model is proposed, obtained using a modeling technique based on the application of the theory of volumetric rigidity of hydraulic systems and their elements. The results of a numerical experiment carried out by numerically solving the equations that make up the mathematical model of a power source are also presented. As a result of a numerical experiment, the main technical capabilities of the considered power source and the influence of its main structural parameters and functional features of the system on operational properties are revealed. The results showed that due to changes in various design parameters of the unloading machine, you can not only change the upper (maximum) and lower (minimum) values of the battery charging pressure, but also adjust their difference depending on the requirements for the power source. The main property of a power source with an automatic unloading device of the proposed design, confirmed as a result of a numerical experiment, is that the automatic unloading device provides a clear relay switching of the pump operation mode from unloading to operating mode and vice versa. The revealed properties make it very promising to use a pump-accumulator power source in the hydraulic systems of mobile machines and technological equipment.

scholarly journals Economic and theoretical study of the power supply from a pump-battery based on a discharge machine

2020 ◽  
Vol 175 ◽  
pp. 05042
Author(s):  
Kirill Kobzev ◽  
Sergey Vyalov ◽  
Alexander Rybak
Keyword(s):  
Mathematical Model ◽  
Numerical Experiment ◽  
Structural Parameters ◽  
Operation Mode ◽  
Power Source ◽  
Design Parameters ◽  
Hydraulic Systems ◽  
Original Design ◽  
Functional Features ◽  
Pump Storage Power

The article discusses the control system of a hydraulic power source of constant pressure, which is a pump-storage power source, equipped with the original design of the automatic unloading of the hydraulic pump, which provides relay switching of its operation mode. A mathematical model is proposed, obtained using a modeling technique based on the application of the theory of volumetric rigidity of hydraulic systems and their elements. The results of a numerical experiment carried out by numerically solving the equations that make up the mathematical model of a power source are also presented. As a result of a numerical experiment, the main technical capabilities of the considered power source and the influence of its main structural parameters and functional features of the system on operational properties are revealed. The results showed that due to changes in various design parameters of the unloading machine, you can not only change the upper (maximum) and lower (minimum) values of the battery charging pressure, but also adjust their difference depending on the requirements for the power source.

Machine Learning-Driven Individualized Gait Rehabilitation: Classification, Prediction, and Mechanism Design

2020 ◽  
Vol 3 (2) ◽  
Author(s):  
Amol Loya ◽  
Shrinath Deshpande ◽  
Anurag Purwar
Keyword(s):  
Machine Learning ◽  
Ease Of Use ◽  
Classification Model ◽  
Machine Learning Techniques ◽  
Gait Rehabilitation ◽  
Synthesis Methods ◽  
Human Machine Interaction ◽  
Design Concepts ◽  
Rehabilitation Devices ◽  
Classification Prediction

Abstract This paper presents a machine learning-based approach toward designing individually targeted rehabilitation devices. This approach consists of a classification model for early detection of a disease, regression, and artificial neural networks (ANNs) models to predict the target rehabilitation gait for a specific individual, and finally a generative approach for the conditional synthesis of single degree-of-freedom linkage mechanisms for gait rehabilitation. Design of mechanisms for human–machine interaction involves numerous subjective criteria and constraints in addition to the motion task. This is particularly important for the rehabilitation devices, where the size, complexity, weight, cost, and ease of use are critical factors. In this paper, we present an end-to-end computational approach for developing a device for individualized gait rehabilitation using machine learning techniques focusing on gait classification, prediction, and specialized device design. These models generate a distribution of linkage mechanisms, which strongly correlate to the distribution of target path variations. This way of formulating the problem results in a large variety of solutions to which subjective criteria can be applied to yield practically useful design concepts that would otherwise not be possible using traditional synthesis methods.

scholarly journals Simulation of the pump-battery power supply control system based on the unloading machine

2020 ◽  
Vol 164 ◽  
pp. 01004 ◽  
Author(s):  
Alexander Rybak ◽  
I Tsibriy
Keyword(s):  
Control System ◽  
Numerical Experiment ◽  
Power Supply ◽  
Operation Mode ◽  
Power Source ◽  
Design Parameters ◽  
Hydraulic Systems ◽  
Original Design ◽  
Battery Power ◽  
Functional Features

The aim of this article is to create a control system for a constant hydraulic power source pressure, a pump -battery power source equipped with an original design of the hydraulic pump discharge machine that provides relay switching of its operation mode. This aim is achieved by using a simulation method based on the application of volumetric stiffness theory of hydraulic systems and their elements. As a result of a numerical experiment conducted by solving the equations that make up the mathematical model of power supply, its main technical characteristics and the influence of its main design parameters on its functional features and operational properties are obtained. The obtained results showed that by changing the various design parameters of unloading machine, it is possible not only to change the upper (maximum) and lower (minimum) values of the battery charging pressure, but also to adjust their difference depending on the requirements for the power source. The main result of this study is that as a result of a numerical experiment, it is proved that the unloading machine provides a clear relay switching of the pump operation mode from unloading to operating mode and Vice versa. The identified properties make a very promising use of a pump -battery power source in the hydraulic systems of mobile machines and process equipment.

scholarly journals Functional Features of Logistic Activities of Machine-Building Enterprises

2019 ◽  
Vol 12 (503) ◽  
pp. 227-233
Author(s):  
O. I. Maslak ◽  
◽  
V. G. Nikitiuk ◽  
Keyword(s):  
Machine Building ◽  
Functional Features ◽  
Building Enterprises

scholarly journals Identification of the conditions of a mine locomotive brake system as well as its functional and morphological model with the stressed closed kinematic circuit

2020 ◽  
Vol 201 ◽  
pp. 01033
Author(s):  
Oleksandr Koptovets ◽  
Jamil Sami Haddad ◽  
Dmytro Brovko ◽  
Liudmyla Posunko ◽  
Valeriia Tykhonenko
Keyword(s):  
Practical Implication ◽  
Kinetic Characteristic ◽  
Building Design ◽  
Electrical Equipment ◽  
Machine Building ◽  
Rolling Stock ◽  
Brake Shoe ◽  
Reliability Indices ◽  
Parametric Reliability ◽  
Morphological Model

The common tendency of mine rail haulage improvement is to increase axial power of electrical equipment traction, wagon capacity, and enhancing the speed of movement. In this context, it is typical for mine machine-building design to equip only locomotives with brake facilities. Thus, specific value of braking force of a train cannot exceed basic specific resistance to its movement. Test results of carriage rolling stock as for its braking efficiency as well as for its structural and dynamic analysis of braking mechanism have shown that a shoe-wheel brake of mine locomotives is not efficient under operation brake conditions in terms of the parametric reliability indices; hence, it is not applicable as an analogue for a trailing train part. The objective of the research is to determine a type of structural uncertainty while identifying brake conditions for adaptive control of alternative-structure tribologic system. Practical implication of the results is to determine both type and parameters of empiric dependence of brake shoe friction on a wheel tread upon the speed and braking as well as upon determination of kinetic characteristic of carriage rolling stock brake to be used in the theory of a mine train haulage to provide its safety.

Classification of Vortex Jet Devices for Gas Flow Control in Pneumo-Hydraulic Systems

2020 ◽  
pp. 43-58
Author(s):  
A.Y. Uss ◽  
A.V. Chernyshev
Keyword(s):  
Flow Control ◽  
Gas Flow ◽  
Vortex Flow ◽  
Hydraulic Systems ◽  
Advantages And Disadvantages ◽  
Working Medium ◽  
Functional Features ◽  
Technical Solutions ◽  
First Time

This article presents a review and analysis of the literature on the development and study of vortex jet devices that are used as control valves employing the principle of the vortex flow of the working medium. The article discusses vortex valves without mechanically moving parts, as well as semi-mechanical vortex valves. The principle of operation of a vortex jet device is described and, for the first time, a classification of vortex jet devices by a number of structural and functional features is carried out. The analysis of technical solutions identifies the advantages and disadvantages of vortex jet devices. Recommendations are given for selecting a structure diagram of a vortex jet device.

scholarly journals Design principes of single-stage rolling mills for machine-building industries

2018 ◽  
Vol 63 (3) ◽  
pp. 297-306
Author(s):  
V. A. Tamila
Keyword(s):  
Front Axle ◽  
Machine Building ◽  
Single Stage ◽  
Body Parts ◽  
Hydraulic Systems ◽  
Elastic Suspension ◽  
Rolling Mills ◽  
Air Suspension ◽  
Direction Of Movement ◽  
Lifetime Reliability

The use of variable profiles in engineering is the most effective way to reduce metal consumption and improve performance, increase the lifetime, reliability of machines and mechanisms, and reduce costs for their production, repair and operation. The purpose of the present work is to systematize the blanks of machine-building industries obtained by methods of plastic deformation and to develop general principes of the con cept of creating single-stage rolling mills on the basis of analysis of their design and operation. Three main classes of profiles are distinguished, differing in the type of the initial workpiece: strip, shaped and tube periodic billets. All these types of blanks can be used as semi-finished products for the production of the main parts of suspension and chassis of cars. Strip billets are widely used for the manufacturing of elastic suspension elements, tubular – for manufacturing of hollow body parts with increased requirements for strength and rigidity, in particular, driving axle housing, semi-axles of cars and trailers, jet engine casings. Shaped periodic profiles of various shapes are used as blanks for hot volumetric stamping. Mills and automatic lines for the rolling of blanks of low-spring springs, under-springs, guide bearings of air suspension, rolling of the bars of the front axle beam, manufacturing of protective elements and semi-axes of agricultural machinery developed under the guidance or with the direct participation of the author are presented. General requirements for the deformation equipment of machine-building industries are formulated. Recommendations to use induction heating and high-temperature thermomechanical treatment are justified. It is not recommended to change the direction of movement of the workpiece in the process chain. As a power drive equipment it is better to take electromechani cal, rather than hydraulic systems. It is also advisable to choose separate drives for each working element of the equipment.

scholarly journals Solid State A-C Variable Speed Drives

1977 ◽  
Author(s):  
John D. Zak
Keyword(s):  
Solid State ◽  
High Performance ◽  
Hydraulic Systems ◽  
Variable Speed Drives ◽  
Pwm Inverter ◽  
Pulse Width Modulated ◽  
Design Concepts ◽  
Industrial Drive ◽  
Adjustable Speed ◽  
Drive Systems

Solid state adjustable-speed a-c drives offer a new era in high performance, maintenance-free, industrial drive systems. Whether applying a solid state adjustable-speed a-c drive to a new application or a retrofit to a fixed frequency drive there will be recognized unique advantages, both economically and from this standpoint of performance. Since its’ introduction in the mid 1960’s the pulse width modulated (PWM) inverter has offered a number of significant advantages over hydraulic systems and other inverter types for low and medium frequency applications. With the advent of the fast turn-off thyristors and advances in PWM modulator techniques, the PWM now offers distinct application advantages to 200 Hz. PWM design concepts are analyzed, with a comparison of different types of inverters are discussed. Paper published with permission.

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