11 documents found, page 1 of 2
Study of the requirements of an autonomous system for surface water quality mon...
Barros, M.; Granchinho, P.; Ferreira, C.; Neves, P.; Magalhães, H.; Santos, L.; Lopes, B.; Marques, J.; Pinho, H.; Mourato, SandraIn recent years, there has been increasing awareness of the preservation, protection and sustainable use of natural resources. Water resources, being one of the most important natural resources, face major threats due to contamination by pollutants of various types and origins. Maintaining the quality of water resources requires more robust, reliable and more frequent monitoring than traditional techniques of d...
Wheel-rail contact models in the presence of switches and crossings
Magalhães, H.; Marques, Filipe; Antunes, P.; Flores, Paulo; Pombo, J.; Ambrósio, J.; Qazi, A.; Sebes, M.; Yin, H.; Bezin, Y.The development and implementation of wheel-rail contact models in multibody codes are two active research topics, aiming at improving the accuracy of numerical results and computational efficiency of the dynamics analysis. However, the realism of numerical results is challenged when considering switches and crossings (S&C), where the most adverse wheel-rail contact conditions occur. This paper presents a bench...
Whole Genome Analysis of Alentejano Pigs with Contrasting Meat Quality Phenotypes
Usié, A.; Magalhães, H.; Leão, C.; Gaspar, D.; Meireles, B.; Barbosa, P.; Cachucho, L.; Albuquerque, A.; Charneca, R.; Martins, J.M.; Jerónimo, E.The Alentejano is a Mediterranean pig breed, found in southern Portugal, reared under extensive conditions and finished on grass and acorns during the fall and winter months. From these animals a variety of dry-cured meat products of great economic importance are generated. A total of 541 pigs were studied during the 2017 slaughter campaign. Phenotypic records for carcass and meat quality were collected and sub...
Wheel-rail contact models in the presence of switches and crossings
Magalhães, H.; Marques, F.; Antunes, P.; Flores, P.; Pombo, João; Ambrósio, J.; Qazi, A.; Sebes, M.; Yin, H.; Bezin, Y.The development and implementation of wheel-rail contact models in multibody codes are two active research topics, aiming at improving the accuracy of numerical results and computational efficiency of the dynamics analysis. However, the realism of numerical results is challenged when considering switches and crossings (S&C), where the most adverse wheel-rail contact conditions occur. This paper presents a bench...
Whole Genome Analysis of Alentejano Pigs with Contrasting Meat Quality Phenotypes
Usié, A.; Magalhães, H.; Leão, C.; Gaspar, D.; Meireles, B.; Barbosa, P.; Cachucho, L.; Albuquerque, A.; Charneca, R.; Martins, J.M.; Jerónimo, L.The Alentejano is a Mediterranean pig breed, found in southern Portugal, reared under extensive conditions and finished on grass and acorns during the fall and winter months. From these animals a variety of dry-cured meat products of great economic importance are generated. A total of 541 pigs were studied during the 2017 slaughter campaign. Phenotypic records for carcass and meat quality were collected and sub...
Contact detection approach between wheel and rail surfaces
Marques, Filipe; Magalhães, H.; Pombo, J.; Ambrósio, J.; Flores, PauloThis work presents a general formulation to identify the contact points for the interaction between wheels and rails in the context of railway dynamics simulations. This formulation treats the wheel and rail as parametric surfaces and searches the contact between each wheel strip and the rail independently to avoid the numerical difficulties due to the wheel concave zone. This methodology assumes the rail as lo...
An optimization approach to generate accurate and efficient lookup tables for e...
Magalhães, H.; Marques, F.; Liu, B.; Pombo, João; Flores, P.; Ambrósio, J.; Bruni, S.In a wide number of engineering applications, the interpolation of a lookup table (LUT) can substitute expensive calculations. The generation of a LUT consists of pre-calculating a set of quantities from a collection of points that covers the study domain where the interpolation is possible. Nevertheless, the selection of points where the exact calculation is performed is of utmost importance for the LUT size a...
A co-simulation approach to the wheel–rail contact with flexible railway track
Antunes, P.; Magalhães, H.; Ambrósio, J.; Pombo, João; Costa, J.The standard approach to railway vehicle dynamic analysis includes running the vehicle multibody models in rigid railway tracks. The wheel–rail contact, independently of the rolling contact model used, is either handled online or via lookup tables. This traditional approach disregards the coupling effects between the railway vehicle dynamics and the railway track flexibility. In this work the assumption of rigi...
An optimization approach to generate accurate and efficient lookup tables for e...
Magalhães, H.; Marques, F.; Liu, B.; Pombo, João; Flores, P.; Ambrósio, Jorge; Bruni, S.In a wide number of engineering applications, the interpolation of a lookup table (LUT) can substitute expensive calculations. The generation of a LUT consists of pre-calculating a set of quantities from a collection of points that covers the study domain where the interpolation is possible. Nevertheless, the selection of points where the exact calculation is performed is of utmost im-portance for the LUT size ...
Railway vehicle performance optimization using virtual homologation
Magalhães, H.; Madeira, JFA; Ambrósio, J.; Pombo, J.Unlike regular automotive vehicles, which are designed to travel in different types of roads, railway vehicles travel mostly in the same route during their life cycle. To accept the operation of a railway vehicle in a particular network, a homologation process is required according to local standard regulations. In Europe, the standards EN 14363 and UIC 518, which are used for railway vehicle acceptance, requir...