Our team at Klokner Institute under Czech Technical University in Prague is working in a joint effort with Technical University of Liberec and Klokner on a comprehensive 3D printing system for cementitious materials, including specially optimized robotic arm. The goal of this system is to decrease the environmental impact of construction industry by reducing the volume of materials and time required, as (…)
For the 3D STAR project and 3D printing purposes, a special fine-grained cement mixture from locally available raw materials was developed. The reason for the development of the custom mixture was the possibility of arbitrary optimization of the developed mixture at any stage of the project and for any type of application. Mix design, printing head and the entire system from mixing to extrusion was the (…)
The paper deals with the issue of chatter reduction by modification of both the cutting tool geometry and the machining strategy. Tool wear, cutting forces, surface roughness, and flatness of milled thin-walled parts produced by WAAM (Wire and Arc Additive Manufacturing) technology are evaluated. The machining strategy and parameters of the cutting tool macrogeometry were designed on the basis of experi (…)
Engineering companies, which are concerned with manufacturing activities in forming and welding technologies, consider with such a degree of an automation of the production process that will bring production improvement, lower production time and also economic benefits with return of investment. In the present time, businesses depend on a market economy conditions. Therefore, it is necessary to design p (…)
This contribution focuses on solving the inverse and forward kinematics in the kinematic analysis of a two-link manipulator model. It involves determining the trajectory of the end effector through fifth-degree polynomial interpolation. Furthermore, given initial and final arm angle values, it computes not only the end effector trajectory but also the angular parameters of individual actuators in both a (…)
Sensor diagnostics is an increasingly hot topic nowadays. It helps to improve their operational accuracy, analyze and evaluate their lifetime and monitor wear rates. A diagnostic laboratory has been constructed for force-measuring sensors with the ambition of future experiments. A current topic is the monitoring of the influence of deformation of progressive materials in the measurement and diagnostic p (…)
This case study investigates the revitalization of the Korytnica spa settlement in the Low Tatras, known for its rich natural and cultural heritage, including mineral springs. Despite its historical and therapeutic advantages, Korytnica currently experiencing challenges in renovation and development as a thriving spa and tourist resort. The article explores the strategic use of geolocation measurement t (…)
Reaming is a crucial technology in finishing operations, demanding high stability in the machining process for optimal results. The clamping system significantly influences the dynamic properties of the system tool – clamping - machine and is key in mitigating chatter. The introduction of new designs in clamping exchangeable reaming heads presents several challenges, particularly in terms of vibration s (…)
This paper introduces an accelerated iterative Conjugate Gradient method (CG-method) for simulating the varying static receptance of a thin-walled workpiece. The proposed approach enhances computational efficiency by computing an optimal initial displacement guess for a given cutter location. This guess is based on the previously calculated displacement vector from the preceding cutter location, serving (…)
This research delves into challenges within injection molding, particularly the struggle to maintain uniform cooling in complex product shapes. Additive manufacturing, like conformal cooling, is explored as a potential solution but faces surface quality issues. The study investigates Abrasive Flow Machining (AFM) as a means to refine surfaces within cooling channels, crucial for injection molds. The res (…)
In the paper influence of several factors on shape accuracy and compressive strength of parts is analysed. First simulation software is used for prediction. Parts are cylindrical with 20 mm diameter, manufactured via SLA additive manufacturing technology. 1mm thick Gyroid TPMS structure is generated in cylinders with different volume % (30,40,50 %). Thanks to drainage holes it was possible to create par (…)
Steel wire ropes are among the essential technical elements widely used in many industries. The impeccable condition of these elements has a major impact on the safety of entire facilities where they are applied, be it construction, mining, agriculture, transport, engineering or another area. This article focuses on comparing two non-destructive methods designed to study the internal defects of steel wi (…)
In this article, the authors refer to the measurement of acoustic emission, where they found that this methodology can determine the combustion characteristics in the combustion chamber of the engine and thus it is possible to confirm a better combustion process and overall reduction of engine noise after decarbonization. The formation of diesel exhaust soot is also supported by the authors' paper, in w (…)
This article explores the use of shape memory alloy (SMA) materials in the creation of robot effectors. Specifically, we focus on the design and implementation of a gripper powered by nitinol springs. Nitinol, an alloy of nickel and titanium, can return to a pre-set shape when heated - a phenomenon known as the shape memory effect - which we utilize to control the gripper. The article showcases the desi (…)
The article deals with implementing IO-LINK components in the sorting station of the FESTO FMS 500 automated line and their experimental verification based on the principles of IO-LINK technology. The implementation of such technology also includes the upgrade of the PLC control to PLC S7-1500 (SIEMENS), the addition of an IO-LINK device (BALLUFF BNI005H), and a signaling light device from the same comp (…)
Polymeric materials are increasingly used in the construction of machines and devices. As their use increases, so does the proportion of the waste produce in the industry. One of the ways to reduce the waste is the addition of recycled material into the re-production. Although the addition of the return material reduces the proportion of produced waste, it can lead to the modification of mechanical prop (…)
Like all branches of our economy, also railway transport is based on long-term strategic plans whose aim is to create a transportation policy in order to achieve the most appropriate and equal conditions for all carriers. Coping with safety and hazard prevention must be based mainly on the capabilities of each business entity. The paper points out the issue of employees’ work safety in the Slovak Railwa (…)
The direction of research is the development of principles and methods for making scientifically based decisions in the design and additive manufacturing of bone substitutes based on apatite-biopolymer composites with functional properties depending on the nature of the localization of the cavity bone defect and its size. The relevance is due to the fact that the development of an intelligent decision-m (…)
The research being carried out is aimed at applying nonlinear dynamics methods in product life cycle management to improve communication between processes and achieve environmental sustainability. The purpose of the article is to create a nonlinear mathematical model for analysing product lifecycle management. Chaotic nonlinear dynamical processes of product lifecycle are deterministic but have the prop (…)
Growing concern of carbon dioxide emissions, greenhouse effects and rapid depletion of fossil fuels raise the necessity to produce and adopt new eco-friendly sustainable alternatives to the internal combustion engine driven vehicles. For this reason, in the last decade, electric vehicles have become in some way widespread, principally because of their negligible flue gas emissions and lesser reliance on (…)
Augmented reality (AR) provides possibilities from simple displays to tools improving service in the production process. It has found justification in the field of crisis/critical situation management and also in the commercial sphere. The technologies of the digital world together with AR are directed towards the user environment and the operation of technical devices does not deal with the essence of (…)
Additive manufacturing has the potential to revolutionize the production of complex and adapted parts, but is prone to manufacturing errors, ranging from minor inaccuracies and mechanical failures to complete failures associated with the production of rejects. It is therefore necessary to detect these deficiencies in a timely manner, to analyses and apply appropriate settings to minimize the possible oc (…)
The multiple motor drives are complex and coupled MIMO nonlinear systems. Due to the complexity of their mathematical models the development of effective control systems is quite complicated task. This paper presents the design of optimal control based on the quadratic optimality criterion for the central section of the continuous production line using soft computer methods when fuzzy model of the contr (…)
The design of the body shape of spur gears has an effect on the deformation and thus also the stiffness of the gearing. The stiffness of the gearing is a parameter that significantly affects the noise level of transmission mechanisms. Determining the gear stiffness is difficult due to the shape of the gear teeth. The paper examines the influence of the shape and size of individual gear body parameters o (…)
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