86,663 research outputs found
Digital Recording of High Speed Voltage Transients
No full text3-rd International Symposium on Measurement in Electrical and Electronic Power System
Electrical Network Simulation with Digital Signal Processors
No full textInternational Sumulation Multiconference on Modelling and Simulatio
Transitive Matrices, Strict Preference and Ordinal evaluation Operators
No full textLet X be a set of alternatives and a_{ij} a positive number expressing how much the alternative x_{i} is preferred to the alternative x_{j}. Under suitable hypothesis of no indifference and transitivity over the pairwise comparison matrix A = (a_{ij}), the actual qualitative ranking on the set X is achievable. Then a coherent priority vector is a vector giving a weighted ranking agreeing with the actual ranking and an ordinal evaluation operator is a functional F that, acting on the row vectors of A provides a coherent priority vector. In the paper we focus on the matrix A, looking for conditions ensuring the existence of coherent priority vectors among the columns. Then, given a type of matrices, we look for ordinal evaluation operators, including OWA operators, associated to it
Electrical Network Simulation with Digital Signal Processors
No full textInternational Sumulation Multiconference on Modelling and Simulatio
A new approach to assess the influence of road roughness on driver speed behavior based on driving simulator tests
No full textVehicle speed is one of main parameters describing driver behavior and it is of paramount importance as it affects the travel safety level. Speed is, in turn, affected by several factors among which in-vehicle vibration may play a significant role. Most of speed reducing traffic calming countermeasures adopted nowadays rely on vertical vibration level perceived by drivers that is based on the dynamic interaction between the vehicle and the road roughness. On the other hand, this latter has to be carefully monitored and controlled as it is a key parameter in pavement managements systems since it influences riding comfort, pavement damage and Vehicle Operating Costs. There is therefore the need to analyse the trade-off between safety requirements and maintenance issues related to road roughness level. In this connection, experimental studies aimed at evaluating the potential of using road roughness in mitigating drivers’ speed in a controlled environment may provide added value in dealing with this issue. In this paper a new research methodology making use of a dynamic driver simulator operating at the TEST Laboratory in Naples is presented in order to investigate the relationship between the driver speed behavior on one hand, and the road roughness level, road alignment and environment, vehicle characteristics on the other. Following an initial calibration phase, preliminary results seem fairly promising since they comply with the published data derived from scientific literature
Digital Recording of High Speed Voltage Transients
No full text3-rd International Symposium on Measurement in Electrical and Electronic Power System
Transitive matrices, strict preference and intensity operators
No full textLet X be a set of alternatives and a_{ij} a positive number expressing how much the alternative x_{i} is preferred to the alternative x_{j}. Under suitable hypothesis of no indifference and transitivity over the pairwise comparison matrix A= (a_{ij}), the alternatives can be ordered as a chain . Then a coherent priority vector is a vector giving a weighted ranking agreeing with the obtained chain and an intensity vector is a coherent priority vector encoding information about the intensities of the preferences. In the paper we look for operators F that, acting on the row vectors translate the matrix A in an intensity vector
Assessing Influence of Road Roughness on Driver Behavior: Exploratory Step Through Dynamic Driving Simulator
No full textRoad roughness represents a key parameter in pavement management systems as it affects
driver’s riding comfort, pavement performance and Vehicle Operating Costs.
Ride quality is related to in-vehicle vibration that, in turn, is dependent on the level of road
roughness, on the speed chosen by the driver and on the inertial and mechanical characteristics of
the vehicles. Several studies have highlighted that, under certain conditions, driver may be
induced to vary his speed in order to reach an acceptable in-vehicle vibration level according to
his subjective exposure threshold. In this paper, a further contribution on this issue is presented.
A dynamic driving simulator (DDS) employing a real car fixed on a 6 degrees of freedom motion
platform is currently operating at the TEST Laboratory in Naples. The DDS system is able to
reproduce most of the accelerations the occupants feel, in particular those arising from turning
and braking maneuvers and from dynamic interaction with pavement surface singular
irregularities. A team of researchers from University of Naples “Federico II”, Second University
of Naples, University of Cassino (and the Oktal Company) have improved the system allowing
the implementation of a module simulating vehicle vibrations induced by distributed
irregularities. In this paper, the development of the vibration simulation module and the results
from preliminary experimental calibration procedures are briefly reported. The initial outcomes
of the performed tests seem to fairly agree with similar published results derived from technical
literatur
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