Open Access – Statement
Scientific and professional articles in the journal Ventil are published in open access under the CC-BY-4.0 license. Authors are not charged for publishing the article.
Development and practical use of premium hydraulic oil on mineral basis
In the introduction of the paper, the requirements encountered in modern machines and hydraulic equipment will be stated. The mutual impact between machine requirements, lubricant quality and specifications will be shown.
Nonlinear velocity control of electrohydraulic rotational servo system
This paper studies the closed-loop control of an electrohydraulic velocity servo system with the use of the Lyapunov theory of nonlinear systems using integrator backstepping.
Business and technological aspect of process informatization and automation in industrial practice
Digital transformation brings great technological and business challenges to organizations. It helps to change the patterns of business operations and has the effect of increasing innovation and competitiveness. At the same time, this is a great opportunity to develop and introduce many positive changes to the existing business and process model.
Load-bearing lattice structures and segmentation
Due to their simplicity and versatility, load-bearing lattice structures allow construction in hard-to-reach areas, as they are easy to transport, easy to install and do not take up much space. Established engineering practice uses a modular structure design where the load-bearing structure is divided into height segments. In the presented study, we question the appropriateness of such an approach.
Testing the impact of light conditions on image quality for optical inspection of surface defects
Contactless and automated optical inspection tools make headway in comparison to tactile methods in modern factories. In order to develop an advanced optical tool for inspection of metal components produced for the automotive industry, one faces a number of challenges.
A setting of accelerometer’s parameters for prevention of impacts and movements of washing machines at low rotational speed of drum
Nowadays, vibrations are listed as among the most difficult challenges in the research and development of washing machines. This paper shows the method and procedure of setting up parameters for improvements of the performance of the washing machine by implementing the accelerometer.
A nonlinear model of positioning electrohydraulic servo drive
The highly nonlinear nature of the electrohydraulic servo system is well known. The main reasons for nonlinear and non-differentiable mathematical descriptions of systems dynamics are fluid compressibility, leakage flows, friction forces, and nonlinear fluid flow through servo valve orifices.
Modelling of batch bioreactors
Mathematical models of fermentation processes are indispensable for designing bioreactors, simulation of their operation, optimization of fermentation processes, and design and synthesis of control systems for their control. The paper focuses on the determination of a dynamic mathematical model of the milk fermentation process taking place in a batch bioreactor.
On-line monitoring of hydraulic filter and machine condition
In addition to the hydraulic pump and actuator, which are the ever-present vital components of the hydraulic system, the hydraulic filter on the return line is also the ever-present, indispensable component of any hydraulic system.
Kamikaze – Spirit/Divine Wind (Shinpū Tokubetsu Kōgetai)
Kamikaze (divine wind or spirit wind) were Japanese pilots who in WWII made deliberate suicidal crashes into enemy ships. The pilot (kamikaze) had no means of getting out once the missile was fastened to the aircraft that would launch it.
