Acta Polytechnica: Recent submissions
Now showing items 21-40 of 944
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Developing an effective approach to assess pavement condition for high friction surface treatment (HFST) installation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)For more than two decades, High Friction Surfacing Treatments (HFST) have been used worldwide to improve road safety at critical locations, such as sharp curves and intersections. However, the costs associated with HFST ... -
Performance improvement of manipulator actuated by pneumatic artificial muscles based on synergetic control and social spider optimisation algorithm
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The manipulator actuated by pneumatic artificial muscles (PAM) is a widely used type of robotic arm in industrial automation. However, its performance can be limited by non-linear dynamics and uncertainties in the system. ... -
Empowering IoT: leveraging data sensor communication with LoRAWAN in diverse environments
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The Internet of Things (IoT) connects countless devices, such as sensors and actuators, necessitating an efficient long-range communication technology. Low Power Wide Area Network (LPWAN) solutions, such as LoRAWAN, SIGFOX, ... -
Analysis of reticulated dome with universal connector
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)In order to investigate the stress-strain state of a 4 m diameter reticulated dome model, four series of glued wooden rods were prepared for centric and eccentric compression tests. The tests were carried out in the ... -
Simulation of wind flow around an alternative flat-roofed fortress tower ruin
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)An analysis of the effects of alternative flat roof sizes and positions on wind flow around a ruin model is presented. The modelled ruin has almost cube-like proportions, with an open roof plane and a destroyed corner. ... -
Concept for evaluating the safety of a dynamically loaded gearbox reducer
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The safety of dynamically loaded gearbox reducers is of interest to companies and the scientific community, and any research and conclusion in this direction is a significant contribution, as this problem has not been ... -
A novel approach to nonlinear fractional volterra integral equations
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Nonlinear Fractional Volterra integral equations (FVIEs) of the first kind present challenges due to their intricate nature, combining fractional calculus and integral equations. In this research paper, we introduce a novel ... -
Optimising load transfer using temporary supports in monolithic construction
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)When constructing a ceiling slab, it is essential that the load is effectively transferred to the lower floors. However, challenges arise when the lower ceiling slabs do not meet the specified design strengths, potentially ... -
The effect of a malfunctioning braking system on the behaviour of a special vehicle during an emergency braking in a curvilinear movement
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Vehicle mobility is an increasingly important issue today, even in the military field. Mobility depends on the condition of the vehicle, the route and, of course, the experience of the driver. Vehicle failures and damage ... -
Modelling and analysis of three-dimensional chemically reacting, radiating Casson-nanofluid flow: thermophoresis and Brownian motion effects
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)In the presence of a porous material and a magnetic field, the authors of this work must evaluate the combined effects of chemical reaction and thermal radiation on a Casson-nanofluid flow in three dimensions towards a ... -
Acoustic Radiation Patterns of Different Polygon Piston Surfaces
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Transducers are used in acoustic remote sensing and several other modern applications. The radiating surface geometry of a single acoustic transducer affects its beam pattern and has a cumulative effect on the overall ... -
The application of 3D printing technology in the design of sandwich panels
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Composite materials including sandwich panels can offer a number of advantages such as excellent strength to mass ratio or stiffness to mass ratio. Sandwich panels can find their application in many industrial sectors where ... -
Study of non-stationary cutting processes in power skiving
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The paper presents the results of the modelling and study of the cutting process in the cut-in phase during the machining of external gears by the power skiving. The studies were carried out on the basis of the previously ... -
Investigation of the impact of product thickness and strain on cold forging processes
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This study investigates the impact of sheet metal thickness and strain generated on a cold forging process. A cold forging die was manufactured based on a numerically modelled product design that considered stress concentration ... -
Drece method for continuous severe plastic deformation of CuZn37 sheets
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This paper presents a continuous severe plastic deformation (SPD) process for sheet metal called Dual Rolls Equal Channel Extrusion (DRECE) is introduced. The DRECE process achieves maximum sheet metal deformation by ... -
The effect of the inlet chamber and diffuser on the reverse aerodynamic performance of an axial flow fan
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Flow reversal in axial fans is usually carried out by changing the direction of rotation of the fan and rotating the stator vanes. The total pressure losses of selected inlet fan chambers were determined using CFD data for ... -
Investigation of the effect of elbow pipes of Ti6Al4V, 304 stainless steel, AZ91 materials on erosion corrosion by finite element analysis
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Corrosion is the degradation of metals caused by chemical or electrochemical reactions with their environment. As a result of these reactions, undesirable conditions occur in the physical, chemical, mechanical and electrical ... -
Optimised rotating energy-efficient clustering for wireless sensor devices by sewing training-based optimisation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Wireless sensor networks (WSNs) have become well-known as innovative, active, and robust technology accepted in many real-world applications. Due to the power supply restrictions and the power limitations of sensors that ... -
Hydrothermal and mechanical performance of mortars containing waste brick powder
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)It is widely recognised that green building, environmental sustainability, and technical performance have recently become requirements in the field of civil engineering. For this reason, the new trend in research is to ... -
Effect of surface area on the wear properties of Al-based automotive alloy and the role of Si at eutectic level
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The efficiency of an engine material is closely correlated with its surface area. In order to investigate wear properties, effect of surface contact area as well as silicon addition at the eutectic level of Al-Cu-Mg alloy ...