Abstract This paper presents a brief description of the main systems found in a platform or in an autonomous omnidirectional mobile robot. Each system is described and presents its important role for the functionality of the robot and what are the advantages and disadvantages of using these systems. Concrete examples are presented for the omnidirectional locomotion system, the kinematics of the omnidirectional locomotion, the sensory system of the robot and the navigation systems that can be implemented. The paper wants to highlight the main systems that we must take into account in creating an autonomous mobile robot with omnidirectional wheels.
Abstract Identifying birds in audio signals has been a challenge because the marking of certain species influences their classification. The proposed method consists of a mixture of sound processing for extracting useful signals from longer recordings with dynamic energy thresholds, image processing such as filtering and compression through image resizing for the treatment of the spectrogram and multilayer perceptron networks for the classification. The method shows encouraging results and flexibility, allowing the extension to a larger number of species, as well as applications to other fields involving sound or sound-like signals.
Abstract In this paper is presented a model of locomotion system with omnidirectional wheels for mobile platforms for the industrial environment. In the first part of the paper is made a brief description of the type of wheels used, what are their advantages and disadvantages. In the paper the emphasis is placed on omnidirectional wheels of Mecanum type and all their possibilities of movement are presented. Also presented is the design and sizing of a complete locomotion system for an omnidirectional mobile platform that serves the industrial environment. The chosen kinematic scheme and the calculation of the dimensioning of the necessary motors, the determination of the forces acting on the platform when moving in horizontal plane and the determination of the forces acting on the platform when moving on the ramp are presented.
Abstract This paper presents a technological breakthrough in the manufacturing of miniature revolving surfaces using wire electrical discharge machining (WEDM). The principle of manufacturing highlights specific aspects of the technology concerning the necessary equipment and the steps taken during production. The process of manufacturing is presented mathematically, concerning the surplus of material that is to be removed. The technological solution proposed was validated in practice and it features some experimental results that were obtained. This solution puts forward a new alternative to the manufacturing of small-sized revolving surfaces for hard and extra-hard material parts.
Abstract The paper introduces some considerations on theoretical aspects focusing on increasing the degree of customer satisfaction in the field of public transportation, aiming to improve public relation by augmenting satisfaction. Ensuing the introduction of certain general aspects of the issue, opportunities offered by the EN 13816 European norm are presented, the latter providing useful instruments for improving the quality of public transportation services (the quality loop and the ways of evaluation of internal and external quality of transportation services). Throughout the paper, there have been briefly introduced characteristic elements of the European norm, its objectives, the preconditions for the application of the norm mentioned and the benefits of its implementation.
Abstract The paper analyzes the process of internal honing of cylindrical gears, a new and modern method of finishing the gear tooth flanks. At the beginning, the kinematics of the process is being analyzed. By realizing the state of art, we were able to identify the main features of the process, its advantages in terms of surface precision and quality, the residual stresses and the wear of the flanks compared with other finishing processes. An experimental study of the geometric precision, the shape of the flanks and the roughness for honed surfaces compared to the unfinished ones, highlighted the value and the need of this process.
Abstract Due to the fact that the requirements of the industry aim to improve the dynamics, the safety and the comfort during the use of the vehicles, it is recommended to use the finite element method for component quality optimization. The purpose of this paper is to provide an overview of the current state of analysis through the finite element method of the crimping process used to assemble air springs produced in the automotive industry. Starting from the prototype of an air spring, the researches are focused on the study of the assembly of the piston with the bellow and the crimping ring through the crimping process. After analysis with the finite element method and static tests, improvements were made to the piston, the results of the tests revealing an improvement as opposed the original variant of the piston.
Abstract The present paper proposes a comparative study between two of the most used experimental layouts on the single point incremental forming with the advantages and disadvantages of these experimental layouts. After a short presentation of the newest technological opportunities on single point incremental forming, the paper presents a classification of the experimental layouts used on this kind of forming process. The comparative study highlights the advantages and the disadvantages of using the universal milling machines and the industrial robots on single point incremental forming. There are presented the results focused on thinning and forces in the SPIF process.
Abstract The aim of this paper is to explore the possibility of working with a personalized reusable composite formwork in order to obtain architectural shapes for roof and wall elements without material loss. Starting with the analysis of the market needs, the definition of the functions and continuing with the conceptual and technical solution proposals, we created a formwork variant that can be reused for different complex shapes. The researches set on sight different variations of the material used, their thickness and the contact surface given by the support elements.
Abstract SPIF is a relatively new process that can replace conventional deformation processes. Due to the use of generic tools only, the process is suited to achieving unique production or prototypes. The paper presents a brief literature review on current research of single point incremental forming with applications in obtaining medical implants regarding materials and metodology used.
Abstract To consistently produce high quality products, a quality management system must be practically implemented in every organization. One of its core instrument is to ensure the capability of the measurement systems, which are the basis for decisions regarding the behavior of the product critical quality characteristics. Base on requirements of the quality management system, a Measurement System Analysis should be conducted for all measurement system which are mentioned in the organization quality plan. Most problematic measurement system issues come from measuring discrete data, which are usually the result of human judgment (subjective decision) when categorizing products such as good/bad (visual inspection). It was the aim of this paper to address such an issue presenting a case study made in a local company from the Sibiu region, in order to evaluate how capable are the appraisers to visually inspect steel chains. The results were analyzed using MINITAB statistical software with its module called Attribute Agreement Analysis. The conclusion was that the inspection process must be improved by operator training, developing visual aids/boundary samples, establishing standards and set-up procedures.
Abstract In this article we studies BVP’s that can not be solved as P.V.I or BVP with Matlab solvers ODExx or BVPxx since the solutions do not have limit in 0. We propose a numerical algorithm based on Cubic-spline written in Maple 16 [4].
Abstract This paper presents the development phases of a smart product that can be manufactured on a cyber physical production system. The intelligent product’s requirements are defined from the manufacturing perspective and then converted into technical product characteristics. Finally, we refined the technical characteristics to create a functional tablet with customizable hardware functionalities as a customizable product.
Abstract In this paper we proposed to identify the optimum milling parameter required for finishing processes performed on 3Dprinted parts from ABS and PLA materials. We have identified the optimum milling parameters for a constant spindle speed of 3500 rot/min for face milling and profile contouring operations with different tools diameters. The study was performed on 3D printed specimens from ABS and PLA materials.
Abstract This article presents the study of three-dimensional, stagnation flow of a Powell-Eyring fluid towards an off-centered rotating porous disk. A uniform injection or suction is applied through the surface of the disk. The Darcy law of porous disk for Powell-Eyring fluid is also obtained. The governing partial differential equations and their related boundary conditions are converted into ordinary differential equations by using a suitable similarity transformation. The analytical solution, of the system of equations is solved by using homotopy analysis method. The convergence region of the obtained solution is determined and plotted. The effects of rotational parameter, porosity of the medium, the characteristics of the non-Newtonian fluid and the suction or injection velocity on the velocity distributions is shown by graphical representation.
Abstract With the uptake of the IoT in the industrial domain, a whole new range of cyber-physical systems has emerged; Industry 4.0 is the title given to this technological domain of highly interconnected, data-rich systems. To aid the development of such systems, a range of reference architectures has been developed throughout the years. This paper reviews a number of recent reference architectures, detailing their essential traits as well as identifying aspects that need to be further explored in order to obtain reference architectures better tuned to generating cyber-physical social systems.
Abstract In this paper, the authors propose a studying method for the deformation that appears before crack of ductile materials using the Lode parameter determined by the numerical calculation applied on simple models, verified in previous studies. In order to highlight the influence of the Lode parameter, the tests were performed at simple but also at compound tests. The necessity of these studies lies in the fact that the acknowledged models (the use of the integral J, the critical stress intensity factor Kc or the CPCD method) do not fully explain the phenomenon of deformation before breaking the elasto-plastic materials. The tests were imagined under the form of sets. Each set of tests was performed on smooth specimens and on specimens with a notch radius of 0.5, 2, 4 and 10 mm. Also, each set of tests was performed for pure tensile and combined tensile-torque test.
Abstract Because the requirements of the customers are more and more high related to quality, quantity, delivery times at lowest costs possible, the industry had to come with automated solutions to improve these requirements. Starting from the automated lines developed by Ford and Toyota, we have now developed automated and self-sustained working lines, which is possible nowadays-using collaborative robots. By using the knowledge management system we can improve the development of the future of this kind of area of research. This paper shows the benefits and the smartness use of the robots that are performing the manipulation activities that increases the work place ergonomically and improve the interaction between human - machine in order to assist in parallel tasks and lowering the physically human efforts.
Abstract Innovation is not a simple concept but is the main source of success. It is more important to have the right people and mindsets in place than to have a perfectly crafted plan in order to make the most out of an idea or business. The aim of this paper is to emphasize the importance of intangible assets when it comes to machine vision inspection of thermoplastic materials pointing out some aspects related to knowledge based assets and their need for a success idea to be developed in a successful product.
Abstract The in service safety and reliability assurance of bridges and viaducts is determined by the choice of materials and products suitable for the design bearing solution of that construction structure. The paper proposes an operational solution for the performance characteristics assessment and verification of elastomeric bearings, which will be the basis for the consistent and coherent application of the requirements established by technical and legal regulations in the construction domain.
