Argyris J. Dentsoras

Argyris J. Dentsoras
University of Patras | UP · Department of Mechanical Engineering and Aeronautics

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56
Publications
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879
Citations

Publications

Publications (56)
Article
The present study proposes a new analytical method for traffic analysis of modern elevator systems. The method analyzes probabilistically the complete operation of any configuration of modern directional collective elevator systems, for any combination of building type and architecture and passenger traffic pattern and demand. It presents very low...
Conference Paper
Full-text available
Carbon fiber reinforced plastics (CFRPs) have evolved into the primary material for several lightweight structures. However, despite their extensive use and the quality amelioration, CFRPs remain susceptible to a variety of manufacturing defects, the most common of which are the pores. Predictive tools capable of correlating the mechanical properti...
Article
Full-text available
In the present paper, an index is proposed for belt conveyors that represents the evaluation of the overall functional/design efficiency by considering both energy and service performance. To obtain index value, energy consumption data - that are extracted from a detailed energy analysis of the examined conveyor - are correlated to service performa...
Article
Full-text available
Carbon fiber reinforced plastics (CFRPs) have evolved into the primary material for several lightweight structures. However, despite their extensive use and the quality amelioration, CFRPs remain susceptible to a variety of manufacturing defects, the most common of which are the pores. Predictive tools capable of correlating the mechanical properti...
Article
In the present paper, an index is proposed about the overall efficiency of single escalators in terms of energy consumption and service performance. The index correlates the energy consumed with the number of passengers being served, the elevation height and the average time needed for the service provided. The index may serve as an assisting tool...
Article
In modern buildings, the position(s) of elevator system(s) tends to be a crucial factor for the unimpeded vertical and on-floor circulation of their residents. The present paper introduces a method that correlates circulation data for the population of a typical office building (size, density and possibility for elevator use) with structural and ar...
Conference Paper
Full-text available
Constant and rapid technological progress, along with the evolution of design and production methods, permits the adoption of technological achievements and the embodiment of new features in products. Some of these features pertain to aesthetic attributes that make the key difference when competitive products are considered by customers and users....
Article
End—of—Life Vehicles (ELVs) regarding collection, transportation, dismantling and the recycling process is examined. A closed—loop supply chain for the collection, dismantling and recycling of ELVs in Greece is modeled. The problem is modeled through a multi—criteria decision algorithm solving an Uncapacitated Facility Location Problem. Various con...
Article
The level of standardization of products and systems affects production process and the cost for their operation and maintenance. In reverse engineering and design, the systematic consideration of standards leads to better evaluation and efficient synthesis of parts and assemblies. Taking into account standardization during design leads to systems...
Article
Full-text available
Journal bearing bushing wear and shaft misalignment are the common defects observed in rotating systems. Both defects influence their dynamic behaviour, stability and life time and their detection is a very important task. This article introduces a defect diagnosis approach that uses artificial neural networks. Reynolds equation is solved by finite...
Article
Full-text available
In modern multi-storey buildings, the location of elevator systems is a very crucial factor regarding the efficiency of transportation service and the comfortable and easy on-floor circulation. The present paper proposes a method which, after the partition of a typical floor of a commercial building into cells by a grid, correlates architectural an...
Article
Evaluation of design alternatives is an important task for engineering design and its results affect strongly the outcome of decision-making processes and the quality of the artifact being designed. In the present paper, a method is proposed based on representation of alternatives through associative weighted digraphs of design parameters and use o...
Article
Excavators comprise a category of construction equipment and are used in a wide range of applications of varying scale. Regarding their usage in digging processes, the relevant literature records few analytical methods which, when combined with the available empirical knowledge, provide certain analytical tools, rules, and guidelines. In the presen...
Conference Paper
In modern buildings, the position(s) of elevator system(s) affects strongly the efficiency of people circulation especially during periods of peak demand. The present study introduces a simple model that correlates circulation data (building type, population size and density, space use, etc.) with structural/architectural data (net usable space, ci...
Conference Paper
The present paper introduces a framework for the collaborative determination of design task implementation priorities according to design effort-based calculations. Hierarchical structures are used for representing associative dependencies among primary and dependent tasks. Design effort for task implementation is defined as function of various tas...
Article
The paper refers to the domain of engineering design and introduces a method for obtaining an optimal instantiation process for the design parameters in a design problem by using extended, problem- and path-dependent search within the digraphs that these parameters form.Design parameters are considered as entities being interrelated via determinist...
Article
The present article introduces a systematic approach that applies soft computing techniques, such as genetic algorithms and neuro-fuzzy approximation, in parametric engineering design, such as genetic algorithms and neuro-fuzzy approximation. A generic design problem representation is utilised and genetic optimisation is used in order to extract th...
Conference Paper
The paper proposes an approach for obtaining optimal positioning of excavators in digging processes. First, constraints and assumptions regarding excavator and dig geometries are stated. The excavator work space is correlated to its kinematics and the geometric locus of optimal points – points that correspond to maximal length of boom-arm pair is l...
Conference Paper
Full-text available
In the present paper a new mathematical fuzzy-logic-based formulation of the design objects and the rules that govern a design problem during the conceptual design phase is presented.. A procedure for the automatic generation of degrees of satisfaction of the design specifications for each feasible solution - subjected to design constraints - is in...
Conference Paper
Several techniques have been proposed recently as a result of the intensive research done in the field of computational intelligence. These techniques seem to act beneficially in a variety of scientific domains by performing better than the conventional methodologies. The current paper focuses on the domain of engineering design, whose demanding na...
Article
This paper considers the dynamic behavior of a shaft with two transverse cracks characterized by three measures: position, depth and relative angle. Both cracks are considered to lie along arbitrary angular positions with respect to the longitudinal axis of the shaft and at some distance from the clamped end. A local compliance matrix of two degree...
Article
The present paper surveys the application of soft computing (SC) techniques in engineering design. Within this context, fuzzy logic (FL), genetic algorithms (GA) and artificial neural networks (ANN), as well as their fusion are reviewed in order to examine the capability of soft computing methods and techniques to effectively address various hard-t...
Conference Paper
Full-text available
Two of the most common defects in rotating systems are abnormal wear of the bearing bushing and bearing misalignment. The present paper introduces a new fault diagnosis model that uses artificial neural networks (ANN) in order to identify the increase of wear depth and/or the increment of the misalignment angle. Reynolds equation is solved by FEM a...
Conference Paper
Full-text available
The present paper presents a system used for performing design by making extended use of soft computing techniques. Throughout the paper the design of robotic grippers for flexible materials is used as a reference design case in both its conceptual and detailed design phases. The system contains three modules. The first module focuses on the concep...
Article
The present paper introduces a case-based design with soft computing (Case-DeSC) system that uses soft computing techniques for addressing parametric design problems. Design case representation relies on digraphs of design parameters, supported by fuzzy preferences on specific parameters’ values and weighting factors, which capture the parameters’...
Article
The paper studies the process of information generation during design and introduces new metrics regarding: a. the quantitative determination of its importance and b. the effort required for the instantiation of the design entities representing the design problem. Binary relationships among the design entities (descriptors) form tree structures tha...
Article
The solution to a design problem is extracted through the exploitation of the design knowledge in the context of a space of solution alternatives. The design process incorporates a series of decision making and knowledge management issues, which should be often addressed through collaboration among diverse stakeholders. The alternative solutions mu...
Conference Paper
During the last decades, the engineering community has extensively studied crack identification in rotating machine elements. Although the proposed analytical models may be capable of identifying cracks based on modal analysis, response measurements, or other techniques, the required time for performing the underlying computations is restrictive in...
Conference Paper
From a certain point of view, parametric engineering design may be considered as an optimization problem. The design problem may be represented through a set of design parameters. The optimal solution is located by using a set of competing design parameters and its evaluation is based upon specific criteria. A significant number of techniques and m...
Article
The present paper studies the process of information generation during design and focuses on the relationship between the information importance and the required effort for its generation. Multiple associative relationships among design entities (handled as design descriptors) are used to represent the design knowledge. The characteristics of the d...
Conference Paper
Engineering design requires extensive decomposition and integration activities relying on a multidisciplinary basis. A design structure matrix (DSM) can be used as a representation and analysis tool in order to manage the design process under diverse perspectives. The design outcome is always subject to the abstract nature, the subjectivity and the...
Article
Full-text available
In this paper, an approach for the modelling of the evaluation process in the conceptual design phase is presented. During the design process, the generated candidate solutions are evaluated. The evaluation is achieved by calculating a score that is based on specific criteria that are presented as elements of a vector. Weight factors are applied to...
Conference Paper
In the present paper, a method is presented based on the exploitation of the computational relationships among design entities in order to obtain valuable design knowledge concerning the performance and the function of the designed object (artifact, product, machine, etc.). The approach is applicable for most of the design problems and may be used...
Chapter
An integrated environment is presented that helps a designer to perform efficient dynamic analysis of the defining relationships among the different entities that form the knowledge for a design problem. This environment extends the capabilities and adds new features to a program already used for performing analysis of design relationships. The for...
Article
This paper presents a method for the automatic deduction of prioritylists of input information as well as for the extraction of taskrelations from the available design knowledge. The method is based on multiple extensive searches of the design space and produces a final priority list for the instantiation of the primary design entities. If followed...
Conference Paper
In the present paper, an approach based on fuzzy logic is presented concerning a fuzzy decision support system for faults’ handling in train driving. A short introduction is given first that contains the problem’s description and its major aspects. A literature review follows that refers to the last advances in the field of man–machine interface, f...
Article
Artificial Neural Networks (ANN) are widely accepted as a technology offering an alternative way to tackle complex and ill-defined problems. They can learn from examples, are fault tolerant, are able to deal with non-linear problems, and once trained can perform prediction at high speed. ANNs have been used in diverse applications and they have sho...
Article
A selective, multiple-criteria method is proposed for handling constraint violations in well-defined design problems. First, the types of design problems upon which the method may apply are presented and a graph topology is adopted for representing the problem decomposition in the level of design parameter interrelations (design parameter graphs)....
Article
Artificial Neural Networks (ANN) are widely accepted as a technology offering an alternative way to tackle complex and ill-defined problems. They can be trained to predict results from examples, are fault tolerant, are able to deal with non-linear problems, and once trained can perform prediction at high speed. ANNs have been used in diverse applic...
Article
Full-text available
The paper presents a knowledge-based system (KBS) for the conceptual design of grippers for handling fabrics. Its main purpose is the integration of the domain knowledge in a single system for the systematic design of this type of grippers. The knowledge presented, in terms of gripper, material and handling process, are classified. The reasoning st...
Article
Belt conveyor design is examined as an application of a proposed Design Parameters Space Search technique. First, the main characteristics of the belt-conveyor design process are presented as they appear in the current literature. Furthermore, a proposed general knowledge-representation platform is described, and its ability to house the relevant c...
Article
The present paper approaches two problems concerning belt conveyor design. First, an iterative algorithm is described for analytical belt tension calculations that automatically adjusts their values according to the minimum required belt tension for every belt section. Second, an algorithm is introduced for the control of both the geometrical incli...
Article
The aim of this article is the study of the application of expert systems to a mechanical engineering research domain with practical and commercial interest, such as design and manufacturing of Solar Domestic Hot Water (SDHW) Systems. The issues studied were the selection and the design of SDHW systems. The application of an expert system was explo...
Article
Fatigue crack propagation at resonance for polymers is studied. A simple cracked beam vibrates under an external excitation force with constant amplitude and frequency. The well-known equation of Paris is used, which relates the crack propagation rate with the variation of the stress intensity factor range. The influence of external excitation freq...
Article
A knowledge-based system is presented for the selection of mechanical springs during preliminary design. The selection of spring type(s) and material(s) is based on rules and facts arising from design methods and experience.Knowledge is organized into frames and classes, as well as rules that embody the design knowledge. The query process concernin...
Article
The dynamic behavior of a robot arm has been modelled, taking into account the elasticity and damping of the joints and the backlash introduced by the gear pairs of the transmission mechanism. The links of the robot arm are considered to be rigid and its joints rotational. A technique for automatic formulation of the differential equations of the l...
Article
Fatigue crack propagation in structures excited at one of their resonances is investigated. The structure is discretized and represented by a system of linear differential equations. Cracks are modelled as local flexibilities. Application on a 4-node rotor with a circumferential crack illustrates the dynamic crack arrest. The depth of the crack det...
Article
Fatigue crack growth in resonating structural members is studied. The crack propagation rate is related to the stress intensity factor range by way of the well known power law. The depth of the crack determines the local flexibility due to crack which in turn influences the dynamic response of the system under an external force with constant amplit...
Article
Fatigue crack growth in resonating members of distributed mass is studied under conditions of dynamic interaction between crack growth and crack load. The crack propagation rate is related to the stress intensity facfor range by way of the well known power law. The depth of the crack determines the local flexibility due to crack which in turn influ...

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Project (1)
Project
Reasearch & Code Development for aesthetic optimization of product surface analogies