Browsing by Author "Louca, Loucas S."

Conference Object

An Algorithm for the Selection of Physical System Model Order Based on Desired State Accuracy and Computational Efficiency

Sendur, P.; Peng, H.; Stein, J. L.; Louca, Loucas S. (American Society of Mechanical Engineers (ASME), 2003)

In recent years, algorithms have been developed to help automate the production of dynamic system models, The focus of this development has been to create procedures and algorithms that use modeling metrics for generating ...

Conference Object

Analysis and passive control of a four-bar linkage for the rehabilitation of upper-limb motion

Xydas, E. G.; Louca, Loucas S.; Mueller, A. (American Society of Mechanical Engineers, 2015)

In the last two decades robotic rehabilitation research provided significant insight regarding the human-robot interaction, helped understand the process by which the impaired nervous system is retrained to better control ...

Conference Object

Analytical target cascading for the design of an advanced technology heavy truck

Louca, Loucas S.; Kokkolaras, M.; Delagrammatikas, G. J.; Michelena, N. F.; Filipi, Z. S.; Papalambros, P. Y.; Assanis, D. N. (American Society of Mechanical Engineers (ASME), 2002)

Analytical target cascading (ATC) is a methodology that can be used during the early development stages of large and complex systems for propagating desirable overall product targets to appropriate individual specifications ...

Article

Atemplate-based modeling approach for system design: Theory and implementation

Stein, J. L.; Louca, Loucas S. (1996)

Previous research has developed search algorithms for deducing Proper Models (minimum complexity models with physically meaningful parameters) of dynamic systems. It has also been proposed that these Proper Models can be ...

Conference Object

Bond graph based modal decomposition of systems with non-proportional damping

Louca, Loucas S. (Affiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Street, Nicosia 1678, CyprusCorrespondence Address: Louca, L.S.Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Street, Nicosia 1678, Cyprusemail: lslouca@ucy.ac.cy, 2012)

Modal analysis of lumped parameter and continuous dynamic linear systems is extensively used to study their dynamic behavior and controller design. In both cases, a reduction of the model size that does not degrade accuracy ...

Conference Object

Bond graph based modal representations and model reduction of lumped parameter systems

Louca, Loucas S. (Affiliation: Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Street, Nicosia 1678, CyprusCorrespondence Address: Louca, L.S.Department of Mechanical and Manufacturing Engineering, University of Cyprus, 75 Kallipoleos Street, Nicosia 1678, Cyprusemail: lslouca@ucy.ac.cy, 2006)

Modal analysis is extensively used to study dynamic behavior of continuous and lumped parameter linear systems. More specifically, modal analysis can be used for the analysis and controller design of dynamic systems. In ...

Article

Combined optimisation of design and power management of the hydraulic hybrid propulsion system for the 6 × 6 medium truck

Filipi, Z.; Louca, Loucas S.; Daran, B.; Lin, C.-C.; Yildir, U.; Wu, B.; Kokkolaras, M.; Assanis, D.; Peng, H.; Papalambros, P.; Stein, J.; Szkubiel, D.; Chapp, R. (2004)

Hybrid propulsion systems are one of the critical technologies on the roadmap to future ultra-efficient trucks. While there is a significant body of work related to hybrid passenger cars and light commercial trucks, there ...

Conference Object

Complexity of distributed parameter bond graph models

Louca, Loucas S. (The Society for Modeling and Simulation International, 2014)

Modeling metrics and algorithms that assist the development of dynamic system models are essential for efficient use of modeling and simulation in everyday engineering tasks. Various modeling procedures have been proposed ...

Conference Object Open Access

Creating games or developing programs? Documenting the use of stagecast creator as modeling tool in elementary science

Louca, Loucas S. (University of Zilina, 2005)

This paper reports a descriptive case study investigating the use of a computer-based programming environment (CPE), Stagecast CreatorTM (SC) for collaborative fifth grade modeling in science. SC is a non-linear, object-oriented ...

Conference Object

Design and development of a haptic peg-board exercise for the rehabilitation of people with multiple sclerosis

Xydas, E. G.; Louca, Loucas S. (Affiliation: Mechanical and Manufacturing Engineering Department, University of Cyprus, P.O. Box: 20537, Nicosia, CyprusAffiliation: Mechanical and Manufacturing Engineering Department, University of CyprusCorrespondence Address: Xydas, E. G.Mechanical and Manufacturing Engineering Department, University of Cyprus, P.O. Box: 20537, Nicosia, Cyprusemail: mep4ex01@ucy.ac.cy, 2007)

Peg-in-Hole methods, like the Nine Hole Peg-Board Test (NHPT) and the Perdue board are widely employed for the functional assessment and therapy of the upper limbs of people with Multiple Sclerosis (MS). Such passive devices ...

Article

Design of an advanced heavy tactical truck: A target cascading case study

Michelena, N.; Louca, Loucas S.; Kokkolaras, M.; Lin, C.-C.; Jung, D.; Filipi, Z.; Assanis, D.; Papalambros, P.; Peng, H.; Stein, J.; Feury, M. (2001)

The target cascading methodology is applied to the conceptual design of an advanced heavy tactical truck. Two levels are defined: an integrated truck model is represented at the top (vehicle) level and four independent ...

Article

Design under uncertainty and assessment of performance reliability of a dual-use medium truck with hydraulic-hybrid powertrain and fuel cell auxiliary power unit

Kokkolaras, M.; Filipi, Z.; Stefanopoulou, A.; Papalambros, P.; Assanis, D.; Mourelatos, Z.; Louca, Loucas S.; Delagrammatikas, G. J. (2005)

Medium trucks constitute a large market segment of the commercial transportation sector, and are also used widely for military tactical operations. Recent technological advances in hybrid powertrains and fuel cell auxiliary ...

Conference Object

Determining model accuracy as a function of inputs and system parameters

Sohns, B. J.; Stein, J. L.; Louca, Loucas S. (American Society of Mechanical Engineers (ASME), 2004)

Vital to the effectiveness of simulation-based design is having a system model of known quality. Previous research introduced an algorithm called AVASIM for assessing model validity systematically and quantitatively. AVASIM ...

Conference Object

Effect of links’ center of gravity position on the performance of a four-bar linkage as an upper limb rehabilitation mechanism: A parametric study

Xydas, E.; Herodotou, P.; Louca, Loucas S.; Mueller, A. (Springer Verlag, 2016)

It has been shown that mechanisms based on closed kinematic chains, with integrated passive elements (springs) can generate motions that replicate the natural hand motion and therefore they can be potentially useful in ...

Article

Energy-based model reduction methodology for automated modeling

Louca, Loucas S.; Stein, J. L.; Hulbert, G. M. (2010)

In recent years, algorithms have been developed to help automate the production of dynamic system models. Part of this effort has been the development of algorithms that use modeling metrics for generating minimum complexity ...

Conference Object

Evaluation metrics of upper extremities for people with neurological disorders: An energy based approach

Ilia, T.; Louca, Loucas S. (American Society of Mechanical Engineers, 2017)

Various neurological disorders, like Parkinson's disease, Multiple Sclerosis, Huntington's disease and Stroke, affect millions of people worldwide. Tremor that is a result of these disorders affects the performance of many ...

Article

Extension and application of an algorithm for systematic identification of weak coupling and partitions in dynamic system models

Rideout, D. G.; Stein, J. L.; Louca, Loucas S. (2009)

This paper reviews and extends a technique to detect weak coupling (one-way coupling or complete decoupling) among elements of a dynamic system model, and to partition and reduce models in which weak coupling is found. The ...

Article

Finite segment model complexity of an Euler-Bernoulli beam

Louca, Loucas S. (2015)

A common approach for modeling the dynamic behavior of distributed parameter systems is the approximation through finite-segment models. These models are able to accurately predict the dynamic behavior of the system given ...

Article

A Frequency-Based Interpretation of Energy-Based Model Reduction of Linear Systems

Louca, Loucas S. (2016)

Various modeling techniques have been proposed in order to make modeling a more systematic procedure and to facilitate the development of modeling software that provide users, even experienced users, more ease when developing ...

Article

Fuel cell APU for silent watch and mild electrification of a medium tactical truck

Filipi, Z.; Louca, Loucas S.; Stefanopoulou, A.; Pukrushpan, J.; Kittirungsi, B.; Peng, H. (2004)

This paper investigates the opportunities for improving truck fuel economy through the use of a Fuel Cell Auxiliary Power Unit (FC APU) for silent watch, as well as for powering electrified engine accessories during driving. ...